JP7174520B2 - Electric tool - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power tool, and more particularly to an electric power tool that switches a switch between an on state and an off state via a slidable operating portion.

An electric power tool for driving a tip tool is provided with an operation unit for switching a switch for driving and stopping a motor between an on state and an off state. For example, Patent Literature 1 discloses an electric power tool that uses a motor as a drive source to swing a tip tool attached to a spindle. In this electric power tool, a switch for driving and stopping the motor is switched between an ON state and an OFF state by sliding the operating portion arranged on the upper surface of the main body housing in the front-rear direction.

JP 2017-80827 A

The body housing of the power tool described above is formed by connecting a pair of left and right half-split bodies. In such a housing structure, the operating portion and the arm portion extending rearward from the operating portion and connected to the main switch are sandwiched from the left and right by the half-split bodies, so that the operating portion and the arm portion can be moved forward and backward. can be slidably held. However, power tools do not necessarily have such a housing structure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique for streamlining a holding structure of a switching member that switches a motor of a power tool between an on state and an off state.

According to one aspect of the invention, a power tool configured to drive a tool bit is provided. This power tool includes a motor, a switch, a housing, a switching member, and a holding member.

A switch is provided for starting and stopping the motor. The housing is a hollow body formed by a first housing part having a through hole and a second housing part connected to the first housing part. A housing contains the motor and the switch. The switching member is connected to the switch. Also, the switching member includes an operation portion. The operation part is exposed to the outside through the through hole of the first housing part so as to be movable in a predetermined direction according to manual operation by the user. Further, the switching member is configured to switch the switch between the ON state and the OFF state by linearly moving in a predetermined direction in response to manual operation of the operating portion. The retaining member is supported within the housing by at least one of the first housing portion and the second housing portion. Further, the holding member is configured to hold the switching member so as to be linearly movable in a predetermined direction with respect to the first housing portion.

In the power tool of this aspect, the switching member of the switch is moved from the through hole formed in the first housing portion to the operating portion by the holding member supported by at least one of the first housing portion and the second housing portion within the housing. It is held so as to be exposed to the outside. In other words, the switching member does not need to be sandwiched between the first housing portion and the second housing portion, so that the switching member can be assembled with the switch and the housing more easily. In addition, since the holding member holds the switching member so as to be linearly movable in a predetermined direction with respect to the first housing portion, it is possible to reduce the possibility that the switching member interferes with the internal mechanism during movement. . Thus, according to this aspect, the structure for holding the switching member of the switch of the power tool can be rationalized.

In addition, in this aspect, the motor may be an AC motor or a DC motor. Also, the motor may be a motor with brushes or a so-called brushless motor without brushes.

In the switching member, the operating portion and the portion connecting the operating portion and the switch may be formed integrally or may be formed as separate members and connected. The shape of the holding member and the support structure of the holding member by at least one of the first housing portion and the second housing portion are not particularly limited. For example, the holding member may hold the entire switching member or may hold a portion of the switching member. The holding member preferably has a slide guide portion configured to hold the switching member slidably in a predetermined direction. Such a slide guide portion can be configured by, for example, a concave portion or a convex portion that slidably abuts on at least a portion of the switching member. Also, the retaining member may be a single member, or may include a plurality of members connected to each other or spaced apart.

In one aspect of the present invention, the housing may be formed in an elongated shape extending in a predetermined direction. The housing may include a grip configured to be grippable by a user, and a first end and a second end connected to both sides of the grip in a predetermined direction. The power tool may also further include a spindle disposed within the first end and configured to drive the removably mounted bit by power of the motor. The controls and switches may be located within the first and second ends, respectively. At least part of the holding member may extend in a predetermined direction within the grip to hold the switching member.

The power tool of this aspect is a power tool in which the operation part provided at the same first end as the spindle can be operated while the grip part is gripped. According to this aspect, since the switch is arranged at the second end, it is possible to increase the degree of freedom in designing the grip. Also, the switching member has a length corresponding to at least the grip portion, and at least a portion of the holding member extending inside the grip portion can stably hold the switching member.

In one aspect of the present invention, the power tool may further include a lighting device and wiring for power supply. A lighting device may be disposed at the first end and configured to illuminate the work area with the accessory tool. A wire may extend from the second end and connect to the lighting device. The holding member may then be configured to guide the wiring from the second end to the first end. In other words, the holding member may not only hold the switching member of the switch, but also serve as a wiring guide member for the lighting device. According to this aspect, it is possible to improve the workability of the power tool in a dark place by the illumination device. Also, by effectively utilizing the holding member that holds the switching member in the holding portion, it is possible to realize a rational configuration that guides the wiring from the second end to the lighting device at the first end. Although the type of lighting device is not particularly limited, the lighting device can typically be composed of a light source such as an LED and a cover that covers the light source.

In one aspect of the present invention, the holding member may hold the lighting device. In other words, the holding member may not only hold the switching member of the switch, but may also serve as the holding member of the lighting device. According to this aspect, by effectively utilizing the holding member that holds the switching member, it is possible to realize a rational configuration in which the lighting device is arranged at the first end portion.

In one aspect of the present invention, the holding member may have grooves formed in a surface facing the inner surface of the housing. Then, the wiring may be held within the accommodation space defined by the groove and the inner surface of the housing. According to this aspect, it is possible to reduce the possibility that the wiring will come into contact with the internal mechanism arranged in the housing, so that the wiring can be protected more reliably. It should be noted that the opening of the groove does not necessarily have to be completely covered with the inner surface of the housing (accommodating space is sealed). For example, the wiring may be prevented from deviating from the groove by having the inner surface of the housing face at least a portion of the opening of the groove.

In one aspect of the present invention, the spindle may be rotatably supported around an axis intersecting the predetermined direction. The power tool may also include a transmission mechanism configured to transmit rotational motion of the output shaft of the motor to the spindle to reciprocate the spindle within a predetermined angular range around the axis. According to this aspect, in a so-called vibration tool that swings a tip tool attached to a spindle, the holding structure of the switching member of the switch can be rationalized.

In one aspect of the present invention, the power tool may further include a support and an elastic member. A support is disposed within the housing and may support at least the motor and the spindle. The elastic member may be interposed between the support and the housing to connect the support and the housing so as to be relatively movable. According to this aspect, the housing and the support are coupled via the elastic member so as to be relatively movable, thereby suppressing transmission of vibration generated in the support to the housing as the spindle is driven. can be done. Moreover, since the switching member is held by the holding member supported by the housing, it is possible to reduce the possibility that the operating portion will interfere with the through hole of the first housing portion due to vibration. Furthermore, when the holding member guides the wiring of the lighting device, or when the holding member holds the lighting device, the lighting device and the wiring can be appropriately protected from vibration.

A mode in which the support "supports at least the motor and the spindle" typically includes a mode in which the support accommodates at least part of the motor and the spindle. That is, the support may be an inner housing arranged within the housing and containing at least part of the motor and the spindle. Note that the support may be a single member, or may be formed as an integrated body by connecting a plurality of members. Similarly, the housing that accommodates the support may be a single member, or may be a single member formed by connecting a plurality of members.

The housing and the support may be connected only via the elastic member, or may be connected via the elastic member and other members. The elastic member can be composed of, for example, elastic synthetic resin, rubber element, spring element, or the like. From the viewpoint of effectively suppressing vibration transmission, it is preferable that the elastic member connects at least a region of the support that supports the spindle and any region of the housing. It is further preferred to connect the area of the support supporting the spindle with the area of the housing in which the spindle is accommodated. Further, it is more preferable that the support is connected to the housing via an elastic member so as to be relatively movable in all directions (front-rear, left-right, and vertical directions of the power tool). Although the number of elastic members is not particularly limited, it is more preferable to provide a plurality of elastic members.

1 is an overall perspective view of a vibration tool according to a first embodiment; FIG. It is a vertical cross-sectional view of a vibration tool. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG. 4 is a perspective view of the inner housing with the switch holder connected; FIG. 3 is a partially enlarged view of FIG. 2; FIG. 3 is a cross-sectional view taken along line VII-VII of FIG. 2; FIG. 3 is a cross-sectional view taken along line VIII-VIII of FIG. 2; FIG. 3 is a partially enlarged view of FIG. 2; FIG. 5 is a partially enlarged view of FIG. 4; FIG. 4 is a perspective view of a weight; FIG. 6 is a partially enlarged view of FIG. 5; 3 is a cross-sectional view taken along line XIII-XIII of FIG. 2; FIG. 3 is a cross-sectional view taken along line XIV-XIV of FIG. 2; FIG. FIG. 5 is a cross-sectional view taken along line XV-XV of FIG. 4; FIG. 5 is a cross-sectional view taken along line XVI-XVI of FIG. 4; It is a perspective view of a switch holder, a guide member, and a switching member. 4 is a perspective view of the lower shell, inner housing, switch holder, guide member and switching member; FIG. FIG. 3 is a cross-sectional view taken along line XIX-XIX in FIG. 2; FIG. 3 is a longitudinal cross-sectional view of the lighting unit and its peripheral area, and is a partially enlarged view of FIG. 2; 1 is a cross-sectional view of a lighting unit and its surrounding area; FIG. FIG. 5 is another cross-sectional view of the lighting unit and its surrounding area, which is a partially enlarged view of FIG. 4; It is a vertical cross-sectional view of the vibration tool of 2nd Embodiment.

Embodiments will be described below with reference to the drawings.
[First embodiment]
A first embodiment will be described with reference to FIGS. 1 to 22. FIG. In the following embodiment, an electric vibration tool 100 is exemplified in which a tip tool 91 is oscillatingly driven to perform a machining operation on a workpiece (not shown) (see FIG. 1). The vibration tool 100 is provided with a plurality of types of tools such as blades, scrapers, grinding pads, polishing pads, etc., as the attachable tip tool 91 . The user can select one of these tip tools 91 suitable for desired processing such as cutting, peeling, grinding, polishing, etc., attach it to the vibration tool 100, and perform processing. In addition, in the drawings referred to below, an example in which a blade is attached to a vibration tool 100 is illustrated as an example of the tip tool 91 .

First, a schematic configuration of the vibration tool 100 will be described. As shown in FIGS. 1 and 2, the vibration tool 100 has an elongated housing 1. As shown in FIG. In this embodiment, the housing 1 is configured as a so-called anti-vibration housing having a two-layer structure. The housing 1 includes an elongated outer housing 2 forming the outer shell of the vibration tool 100 and an elongated inner housing 3 housed in the outer housing 2 .

As shown in FIG. 2, a spindle 51 and a motor 53 are housed at one end of the housing 1 in the longitudinal direction. The spindle 51 is arranged such that its axis A1 intersects (more specifically, substantially orthogonal to) the longitudinal axis of the housing 1 . One end of the spindle 51 in the extending direction of the axis A1 protrudes from the housing 1 and is exposed to the outside. A tip tool 91 can be attached to and detached from this portion. A battery 93 for supplying power to the motor 53 and the lighting unit 89 can be detachably attached to the other end of the housing 1 in the longitudinal direction. The vibrating tool 100 reciprocates the spindle 51 about the axis A1 within a predetermined angular range by the power of the motor 53, thereby swinging the tip tool 91 within the swing plane OP orthogonal to the axis A1. is configured to

In the following description, regarding the direction of the vibration tool 100, for the sake of convenience, the extending direction of the axis A1 of the spindle 51 is defined as the vertical direction, and one end of the spindle 51 to which the tip tool 91 is attached is defined as the lower side. Define side as top. Further, the direction perpendicular to the axis A1 and corresponding to the longitudinal direction of the housing 1 is defined as the front-rear direction, one end of the housing 1 in which the spindle 51 is accommodated is the front side, and the battery 93 is mounted on the front side. The end side is defined as the rear side. A direction orthogonal to the up-down direction and the front-rear direction is defined as the left-right direction. When the illustrated blade is mounted as the tip tool 91, the swinging direction of the tip tool 91 generally corresponds to the horizontal direction.

A detailed configuration of the vibration tool 100 will be described below. First, the outer housing 2 and the inner housing 3 that constitute the housing 1 will be described in order.

As shown in FIGS. 1 to 4, in this embodiment, the outer housing 2 is formed by connecting an upper shell 27, a lower shell 28, and a switch holder 20 which are formed separately from each other. ing. The upper shell 27, the lower shell 28, and the switch holder 20 are members integrally molded of synthetic resin. Although the details will be described later, the outer housing 2 is formed by vertically stacking an upper shell 27 and a lower shell 28 with the switch holder 20 interposed therebetween and connecting them with screws at a plurality of locations. It is

Further, in the front-rear direction, the outer housing 2 includes a front end portion 21 , a rear end portion 23 , and a central portion 25 connecting the front end portion 21 and the rear end portion 23 .

The front end portion 21 is formed in a generally rectangular box shape, and a front end portion 31 of the inner housing 3, which will be described later, is arranged inside. A U-shaped operation lever 61 for operating a lock mechanism 6 (see FIG. 6), which will be described later, is supported at the upper front end of the front end 21 so as to be vertically rotatable. An opening 270 is provided at the rear end of the upper surface of the front end portion 21 (upper shell 27) (the boundary with the front end of the grip portion 25, which will be described later). The opening 270 is a through hole that exposes the operating portion 296 to the outside so as to be slidable in the front-rear direction. Although details will be described later, the operation unit 296 is configured as an operation unit that is manually operated by the user in order to switch the switch 29 between an on state and an off state.

The rear end portion 23 is formed in a cylindrical shape that widens rearward (having a larger cross-sectional area) and includes the switch holder 20 fixed inside. The configuration and arrangement of the switch holder 20 will be detailed later. Further, inside the rear end portion 23, an elastic connecting portion 37 and the rear end portion 33 of the inner housing 3, which will be described later, are arranged.

The central portion 25 is formed in a substantially uniform cylindrical shape and extends linearly in the front-rear direction. The central portion 25 constitutes a grip that can be gripped by the user. Therefore, the central portion 25 is formed narrower than the front end portion 21 and the rear end portion 23 so that the user can easily grip it. In addition, below, the center part 25 is also called the holding part 25. As shown in FIG.

Next, the inner housing 3 will be explained. As shown in FIGS. 2 to 5, in this embodiment, the inner housing 3 is formed by connecting a metal housing 38 and a resin housing 39 which are formed separately from each other.

The metal housing 38 is a housing that accommodates the drive mechanism 5, which will be described later, and includes a spindle accommodating portion 381, a motor accommodating portion 383, and an abutting portion 387 that are integrally formed. The spindle accommodating portion 381 is a cylindrical portion extending in the vertical direction. The motor accommodating portion 383 is a cylindrical portion having a larger diameter than the spindle accommodating portion 381 as a whole, and is arranged behind the spindle accommodating portion 381 . The contact portion 387 is a thick plate-like portion extending rearward from the rear end of the motor housing portion 383 . The contact portion 387 is formed along a virtual vertical plane VP (which can be said to be a plane including the axis A1 and the axis A2) including the lateral centerline of the housing 1 so that the plate thickness direction intersects the vertical plane VP. are placed.

The resin housing 39 is made of synthetic resin and is formed of a left shell 391 and a right shell 392 which are formed separately from each other. In the present embodiment, the left shell 391 and the right shell 392 are formed substantially bilaterally symmetrical (plane symmetrical with respect to the vertical plane VP), except for portions connected by screws. Although the details will be described later, the inner housing 3 is formed by screwing the rear end of the metal housing 38 between left and right shells 391 and 392 with the rear end sandwiched between the left and right shells 391 and 392 .

In the front-rear direction, the inner housing 3 includes a front end portion 31 , a rear end portion 33 , an extension portion 35 extending rearward from the rear end of the front end portion 31 , the extension portion 35 and the rear end portion 33 . and an elastic connecting portion 37 that connects the .

The front end portion 31 is a portion including the metal housing 38 and the front end portion of the resin housing 39 . The front end portion of the resin housing 39 is formed in a shape corresponding to the upper end portion of the motor housing portion 383 and constitutes a motor cover portion 311 that covers the opening of the upper end of the motor housing portion 383 .

The rear end portion 33 is the rear end portion of the resin housing 39 and is formed in a substantially rectangular tubular shape. In the present embodiment, the rear portion of the rear end portion 33 constitutes an engagement structure in which the battery 93 can be slidably engaged, and a battery mounting portion 331 having terminals electrically connected to the battery 93 and the like. A front portion of the rear end portion 33 constitutes a control unit accommodating portion 332 that accommodates the control unit 4 .

The extending portion 35 is a cylindrical portion of the resin housing 39 that extends rearward from the rear end of the motor cover portion 311 . The height of the extending portion 35 in the vertical direction is set larger than that of the motor cover portion 311 . Specifically, the extending portion 35 is formed such that its upper portion extends continuously behind the motor cover portion 311 and its lower portion protrudes below the motor cover portion 311 . The front end of the lower portion of the extension portion 35 is arranged so as to contact the outer wall surface of the motor housing portion 383 . The extending portion 35 is a portion corresponding to at least a portion of the grip portion 25 of the outer housing 2 . Here, "corresponding to at least part of the gripping portion 25" can also be rephrased as "at least part of the gripping part 25 accommodates part or all of the extension part 35". . In this embodiment, the length of the extending portion 35 in the front-rear direction is set to be approximately the same as the length of the gripping portion 25 in the front-rear direction, and substantially the entire extending portion 35 is accommodated in the gripping portion 25 . .

The elastic connecting portion 37 is a portion of the resin housing 39 that extends rearward of the extending portion 35 . The elastic connecting portion 37 includes a plurality of elastic ribs 371 connecting the extension portion 35 and the rear end portion 33 in the front-rear direction. The plurality of elastic ribs 371 are spaced apart from each other in the circumferential direction around the long axis of the inner housing 3 extending in the front-rear direction. In other words, an opening is formed between the adjacent elastic ribs 371 to communicate the internal space 370 of the elastic connecting portion 37 with the outside. In this embodiment, a total of four elastic ribs 371 are provided, two each on the left shell 391 and the right shell 392 . In each of the left shell 391 and the right shell 392, the two elastic ribs 371 are spaced apart in the vertical direction and extend rearward so that the vertical space is slightly widened. In the left-right direction, the elastic rib 371 of the left shell 391 and the elastic rib 371 of the right shell 392 extend rearward away from each other so that the interval in the left-right direction widens.

Each elastic rib 371 is formed in a curved belt shape and is provided with flexibility. This allows the elastic ribs 371 to be elastically deformable. Furthermore, in this embodiment, the four elastic ribs 371 are made of a material having a lower elastic modulus than the other parts of the resin housing 39 (that is, the motor cover portion 311, the extension portion 35, and the rear end portion 33). It is Specifically, the elastic ribs 371 are made of polyacetal that does not contain reinforcing fibers, while other parts are made of glass fiber reinforced polyamide. However, the material of the resin housing 39 is not limited to this example. For example, the elastic ribs 371 may be made of polycarbonate or ABS resin (neither of which contains reinforcing fibers) if the rest of the portion is made of glass fiber reinforced polyamide. In the present embodiment, the left shell 391 and the right shell 392 are integrally molded members as a whole, although only the elastic ribs 371 are made of different materials. As described above, in the present embodiment, each elastic rib 371 is formed in a shape that is more likely to be elastically deformed than other parts of the resin housing 39, and is made of a material having a low elastic modulus. It is formed with lower rigidity than the part.

Here, the connection structure between the metal housing 38 and the resin housing 39 of the inner housing 3 will be briefly described.

In this embodiment, as shown in FIG. 5, the metal housing 38 and the resin housing 39 are vertically connected with screws at four locations in the circumferential direction of the motor housing portion 383 and the motor cover portion 311 . The metal housing 38 and the resin housing 39 are connected to each other by connecting the abutting portion 387 and the portion of the resin housing 39 that constitutes the front end portion of the extending portion 35 . directionally connected. Specifically, as shown in FIG. 3, the contact portion 387 is provided with two through-holes penetrating the contact portion 387 in the left-right direction. On the other hand, in the left shell 391 and the right shell 392, two cylindrical portions projecting inward are provided inside the portions constituting the front end portion of the extension portion 35, respectively. A female thread is formed on the inner peripheral surface of the cylindrical portion of the right shell 392 . A screw is inserted into the cylindrical portion of the left shell 391 and screwed into the cylindrical portion of the right shell 392 while these cylindrical portions are inserted into the through holes from the left and right sides of the contact portion 387 . Due to the axial force of the screws, the left shell 391, the contact portion 387, and the right shell 392 are firmly connected without gaps in the left-right direction.

2 and 5, the left shell 391 and the right shell 392 may be connected at two locations at the upper rear end of the extension 35 and at one location at the lower rear end. , connected by screws. The weight 300 is fixed in a state of being sandwiched between the left shell 391 and the right shell 392 at two of the three positions, the upper rear end portion. The weight 300 will be detailed later.

The internal structure of the inner housing 3 will be described below.

First, the internal structure of the front end portion 31 will be described. As shown in FIG. 6, the drive mechanism 5 and the lock mechanism 6 are housed in the front end portion 31 of the inner housing 3 .

The drive mechanism 5 will be explained. As shown in FIG. 6 , the drive mechanism 5 is a mechanism for swinging the tip tool 91 and includes a spindle 51 , a motor 53 and a transmission mechanism 55 .

The spindle 51 is a hollow, substantially cylindrical elongated member. In this embodiment, the spindle 51 is housed in the lower part of the spindle housing portion 381 and is rotatably supported around the axis A1 by two bearings. The spindle 51 has a flange-shaped tool mounting portion 511 protruding radially outward at its lower end portion exposed to the outside from the housing 1 . The tool mounting portion 511 is a portion configured so that the tip tool 91 can be attached and detached. In this embodiment, the tip tool 91 is clamped between the tool mounting portion 511 and the clamp head 521 of the clamp shaft 52 held at the clamp position by the lock mechanism 6, which will be described later.

A motor 53 as a drive source has a motor main body 530 including a stator and a rotor, and an output shaft 531 extending from the rotor and rotating integrally with the rotor. The motor 53 is housed in the motor housing portion 383 so that the axis A2 of the output shaft 531 extends parallel to the axis A1 of the spindle 51 (that is, vertically). In this embodiment, the output shaft 531 protrudes downward from the rotor. In this embodiment, as the motor 53, a compact, high-output brushless DC motor is employed.

The transmission mechanism 55 is configured to transmit the rotational motion of the output shaft 531 to the spindle 51 and reciprocate the spindle 51 within a predetermined angular range around the axis A1. The transmission mechanism 55 is arranged in the metal housing 38 over the lower portion of the spindle accommodating portion 381 and the lower portion of the motor accommodating portion 383 . The transmission mechanism 55 of this embodiment includes an eccentric shaft 551 , a swing arm 553 and a drive bearing 555 . Since the configuration of the transmission mechanism 55 is well known, it will be briefly described here. The eccentric shaft 551 is coaxially connected to the output shaft 531 of the motor 53 and has an eccentric portion that is eccentric with respect to the axis A2. A drive bearing 555 is attached to the outer periphery of the eccentric portion. The swing arm 553 is a member that connects the drive bearing 555 and the spindle 51 . As shown in FIG. 7 , one end of the swing arm 553 is formed in an annular shape and fixed to the outer circumference of the spindle 51 . On the other hand, the other end of the swing arm 553 is bifurcated and arranged to contact the outer periphery of the drive bearing 555 from the left and right.

When the motor 53 is driven, the eccentric shaft 551 rotates integrally with the output shaft 531 . As the eccentric shaft 551 rotates, the center of the eccentric portion moves around the axis A2, so the drive bearing 555 also moves around the axis A2. As a result, the swing arm 553 swings about the axis A1 of the spindle 51 within a predetermined angular range. Since one end of the swing arm 553 is fixed to the spindle 51 , the spindle 51 reciprocates around the axis A<b>1 within a predetermined angle range as the swing arm 553 swings. As a result, the tip tool 91 fixed to the spindle 51 (more specifically, the tool mounting portion 511) is oscillatingly driven about the axis A1 within the oscillating plane OP, and the machining operation can be performed. When the illustrated blade is mounted as the tip tool 91, the swinging direction of the tip tool 91 generally corresponds to the horizontal direction.

The lock mechanism 6 will be described below. The lock mechanism 6 is a mechanism configured to lock the clamp shaft 52 to a clamp position (the position shown in FIGS. 6 and 8) where the tip tool 91 can be clamped between the spindle 51 and the spindle 51 . As shown in FIGS. 6 and 8, the clamp shaft 52 is a substantially cylindrical elongated member. The clamp shaft 52 is configured to be coaxially insertable inside the spindle 51 in the direction of the axis A1. The clamp shaft 52 has a flange-like clamp head 521 at its lower end. A groove portion 523 is provided at the upper end portion of the clamp shaft 52 . The groove portion 523 is a portion in which a plurality of annular grooves surrounding the entire circumference of the clamp shaft 52 are formed in the vertical direction.

The lock mechanism 6 of this embodiment is arranged above the spindle 51 in the spindle housing portion 381 . Lock mechanism 6 includes a compression coil spring 63 , a collar 65 and a pair of clamp members 67 . Since the configuration of the lock mechanism 6 is well known, it will be briefly described here. The collar 65 is annularly formed and rotatably supported by a bearing held in the upper portion of the spindle housing portion 381 . Collar 65 is always urged upward by compression coil spring 63 disposed between spindle 51 and collar 65 . The pair of clamp members 67 are arranged in a space formed inside the collar 65 and are opposed to each other in the front-rear direction while being constantly urged downward. Protrusions 671 are provided on the surfaces of the pair of clamp members 67 facing each other. The ridge portion 671 is a portion in which a plurality of ridges extending in the horizontal direction are formed in the vertical direction.

The lock mechanism 6 is configured to operate in conjunction with the turning operation of the operating lever 61 by the user. The operating lever 61 is connected to a rotating shaft 62 . As shown in FIG. 8, the rotating shaft 62 is supported by the outer housing 2 above the lock mechanism 6 so as to be rotatable around a rotating shaft extending in the left-right direction. The operating lever 61 is connected to the left and right ends of the rotating shaft 62 via screws 623 . The rotating shaft 62 rotates integrally with the operating lever 61 as the operating lever 61 rotates. In addition, in this embodiment, the rotating shaft 62 and the screw 623 are made of metal.

The rotating shaft 62 is formed with an eccentric portion 621 that is eccentric with respect to the rotating shaft. When the operating lever 61 is placed in the locked position shown in FIG. 1, the smaller diameter portion of the eccentric portion 621 is spaced upward from the collar 65 as shown in FIGS. Therefore, the collar 65 is urged upward by the compression coil spring 63 and placed in the uppermost position. On the other hand, the clamp member 67 is biased downward. Therefore, the clamp member 67 is moved radially inward of the collar 65 by the action of the sloped surfaces formed on a portion of the inner peripheral surface of the collar 65 and a portion of the outer peripheral surface of the clamp member 67 . Accordingly, the protrusion 671 and the groove 523 are engaged with each other, and the clamp shaft 52 is clamped by the clamp members 67 . In this state, the clamp shaft 52 is urged upward by the compression coil spring 63 and locked at the clamping position, so that the tip tool 91 is clamped between the tool mounting portion 511 and the clamp head 521 and is attached to the spindle 51. fixed.

On the other hand, when the operating lever 61 is rotated upward from the locked position shown in FIG. 1 and placed at the unlocked position, the larger diameter portion of the eccentric portion 621 comes into contact with the upper end portion of the collar 65 from above. The collar 65 is pushed down against the biasing force of the compression coil spring 63 . The clamp member 67 is also pushed downward together with the collar 65, but is prohibited from further downward movement at a predetermined position. In this state, when only the collar 65 is further moved to the lowest position, the contact between the collar 65 and the inclined surfaces formed on the clamp members 67 is released, and the clamp members 67 are allowed to move radially outward. That is, the clamp shaft 52 is unlocked, and the user can pull out the clamp shaft 52 from the spindle 51 .

The internal structure of the rear end portion 33 will be described. As shown in FIGS. 9 and 10 , in the battery mounting portion 331 forming the rear portion of the rear end portion 33 , as the battery 93 is engaged with the battery mounting portion 331 , the power supply terminal of the battery 93 is displaced. A power receiving terminal or the like that can be electrically connected to is provided. That is, the battery mounting section 331 is configured as a power source-related device that enables power supply from the battery 93 as a power source to the motor 53, the lighting unit 89, the control unit 4, and the like. In addition, since the battery mounting part 331 and its internal structure itself are well-known, detailed description is abbreviate|omitted.

The control unit 4 is housed in the control unit housing portion 332 forming the front portion of the rear end portion 33 . In this embodiment, the control unit 4 includes a three-phase inverter that drives the motor 53 using switching elements, a CPU that controls driving of the motor 53 via the three-phase inverter, and the like. The control unit 4 is electrically connected to the battery mounting portion 331 via wiring (not shown). In this embodiment, power is supplied to the motor 53 and the lighting unit 89 via the control unit 4 .

The internal structure of the extension portion 35 will be described. In this embodiment, the drive mechanism 5 (that is, the spindle 51, the motor 53, and the transmission mechanism 55) is arranged at the front end portion 31, and the battery mounting portion 331 is provided at the rear end portion 33. can be minimized. Therefore, as shown in FIGS. 2 to 5, the extending portion 35 is thinner than the front end portion 31 and the rear end portion 33 so that the grip portion 25 can be easily gripped. Wiring and connection terminals (not shown) for connecting the control unit 4 of the rear end portion 33 and the substrate of the motor 53 of the front end portion 31 are arranged in the lower portion of the extension portion 35 . Further, as described above, the weight 300 is fixed to the upper rear end portion of the extension portion 35 while being sandwiched between the left shell 391 and the right shell 392 .

Here, the weight 300 and its mounting structure will be described. The weight 300 increases the moment of inertia of the inner housing 3 around the axis A1 of the spindle 51 (in particular, the front end 31 housing the drive mechanism 5 and the extension 35 connected to the front end 31 so as not to move relative to each other). For this purpose, the extension portion 35 is provided. In this embodiment, the weight 300 only has the function of increasing the mass of the inner housing 3 to which the weight 300 is attached and adjusting the mass distribution of the inner housing 3 . The weight 300 is made of at least a metal having a higher density than the synthetic resin forming the resin housing 39 (for example, iron, zinc, aluminum, an alloy containing any of them, etc.).

As shown in FIG. 11, the weight 300 is configured such that the rear portion 302 spreads in the left-right direction when viewed from above. Two through holes 304 are formed in the front portion 301 of the weight 300 so as to pass through the weight 300 in the left-right direction. On the other hand, as shown in FIGS. 9 and 10, two cylindrical portions protruding inward are provided inside the portion of the left shell 391 and the right shell 392 that constitute the upper rear end portion of the extension portion 35 . 393, 394 are provided. A female screw is formed on the inner peripheral surface of the cylindrical portion 394 of the right shell 392 . With these cylindrical portions 393 and 394 inserted into the through hole 304 from the left and right sides of the weight 300, the screw 308 is inserted into the cylindrical portion 393 of the left shell 391 and screwed into the cylindrical portion 394 of the right shell 392. . The left shell 391, weight 300, and right shell 392 are rigidly connected in the left-right direction by the axial force of the screw 308, and the weight 300 is substantially immovable relative to the extension portion 35. .

The weight 300 is a portion of the inner housing 3 that accommodates the drive mechanism 5 (the spindle 51, the motor 53, and the transmission mechanism 55) and that can be handled integrally as a rigid body (the front end portion 31 and the extension portion 35). It is arranged at the rear end portion of the combined portion (in other words, the portion on the front side of the elastic connecting portion 37 having flexibility). By arranging the weight 300 at the rear end portion of the extension portion 35, it is possible to effectively increase the moment of inertia of the portion where the front end portion 31 and the extension portion 35 are combined. Further, in the present embodiment, in a state in which the drive mechanism 5 is housed and the weight 300 is attached, the moment of inertia M1 about the axis A1 of the portion where the front end portion 31 and the extension portion 35 are combined is It is set to be 25 times or more and 35 times or less the moment of inertia M2 about the axis A1 of the tip tool 91 having the maximum mass among possible tip tools 91 .

The internal structure of the elastic connecting portion 37 will be described. As shown in FIG. 12 , the rear portion 302 of the weight 300 is arranged in the front region of the internal space 370 (the space region surrounded by the elastic ribs 371 in the circumferential direction) of the elastic connecting portion 37 . Most of the rear portion 302 of the weight 300 is arranged in the internal space 370 , but the left and right ends protrude outward through openings between the elastic ribs 371 .

A switch holder 20 is arranged in the rear region of the internal space 370 . The switch holder 20 is a member configured to hold a switch 29 (see FIG. 10) for driving and stopping the motor 53 . Further, in this embodiment, the switch holder 20 also holds a speed change dial unit 26 . The variable speed dial unit 26 is a device for steplessly setting the rotation speed of the motor 53 . The variable speed dial unit 26 has a variable resistor, and outputs a resistance value to the control unit 4 according to the rotation operation of the dial 261 by the user. As described above, although most of the switch holder 20 is disposed within the internal space 370 of the elastic connecting portion 37, the switch holder 20 is fixed to the upper shell 27 and the lower shell 28 and constitutes a part of the outer housing 2. ing.

Specifically, as shown in FIG. 13 , the switch holder 20 has a body portion 202 and a pair of cylindrical portions 206 . The body portion 202 is a portion that holds the switch 29 and the speed change dial unit 26 (see FIG. 12). Most of the body portion 202 is arranged in the internal space 370 , but the left and right ends are arranged outside the internal space 370 . The pair of cylindrical portions 206 are cylindrical portions that are connected to the front left end and the front right end of the body portion 202 and extend vertically. The cylindrical portion 206 is arranged outside the internal space 370 . At the rear end portion 23 of the outer housing 2 , a pair of left and right cylindrical portions 283 projecting upward are formed on the lower surface of the lower shell 28 . A pair of left and right cylindrical portions 273 projecting downward are formed at corresponding positions of the upper shell 27 . A female thread is formed on the inner peripheral surface of the cylindrical portion 273 . The cylindrical portions 273 and 283 are fitted into large diameter portions formed at the upper and lower ends of the cylindrical portion 206 of the switch holder 20, respectively. The switch holder 20 is fixed to the upper shell 27 and the lower shell 28 by being screwed together.

The elastic connection structure between the outer housing 2 and the inner housing 3 will be described below. In this embodiment, the outer housing 2 and the inner housing 3 are connected via elastic members at a plurality of positions in the front-rear direction. Specifically, two front elastic members 71 are interposed between the front end portion 21 of the outer housing 2 and the front end portion 31 of the inner housing 3 (see FIG. 14). Two rear elastic members 76 are interposed between the switch holder 20 of the outer housing 2 and the rear end portion 33 of the inner housing 3 (see FIG. 10).

First, the arrangement of the front elastic member 71 will be described. As shown in FIG. 5, in the metal housing 38, a recess 382 having an elliptical shape in a side view is provided in the boundary region between the spindle accommodating portion 381 and the motor accommodating portion 383. As shown in FIG. The front elastic member 71 is fitted in the recess 382 . The front elastic member 71 has three through-holes 711 spaced apart from each other in the vertical direction. A protrusion provided on the bottom of the recess 382 is fitted in the central through hole 711 of these. As shown in FIG. 14 , the recesses 382 are symmetrically provided on the left and right sides of the front end portion 31 . In this embodiment, the front elastic member 71 is made of a material having an ultrafine foamed structure (also called an ultrafine cell structure). For example, a urethane foam having an ultra-fine foam structure (a urethane-based resin having an ultra-fine foam structure) can be used. In this embodiment, a material called microcellular polyurethane elastomer, which is said to be particularly excellent in vibration absorption and durability among such urethane foams, is employed.

In this embodiment, the front elastic member 71 is connected to a connecting member 72 fixed to the outer housing 2 . The connecting member 72 includes a pair of cylindrical portions 721 extending parallel to each other and a substantially U-shaped base portion 725 connecting the pair of cylindrical portions 721 . The connecting member 72 is fixed to the outer housing 2 in such a state that the base portion 725 is arranged on the bottom portion of the lower shell 28 below the metal housing 38 and the cylindrical portion 721 protrudes upward to face the front elastic member 71 . It is

Specifically, as shown in FIG. 15 , through holes 281 are formed in the lower shell 28 at the left front end and the right front end of the front end 21 of the outer housing 2 , and correspond to the upper shell 27 . A pair of cylindrical portions 271 that protrude downward are formed at the positions where they meet (only the left through-hole 281 and the cylindrical portion 271 are shown in FIG. 15). A female thread is formed on the inner peripheral surface of the cylindrical portion 271 . The cylindrical portion 271 of the upper shell 27 is fitted into the large-diameter portion formed at the upper end of the cylindrical portion 724 of the connecting member 72, and the screw 726 is inserted through the cylindrical portion 724 from below the through-hole 281. The connecting member 72 is fixed to the outer housing 2 by being screwed onto the cylindrical portion 271 . In other words, the connecting member 72 forms part of the outer housing 2 . As shown in FIG. 15, the upper shell 27 and the lower shell 28 are also fixed with screws at the left rear end and right rear end of the front end portion 21 (in FIG. 15, the right rear end is only part is shown).

As shown in FIG. 14 , each cylindrical portion 721 of the connecting member 72 has two projecting portions 722 projecting toward the inner housing 3 . The tips of the two projecting portions 722 are respectively fitted into the upper and lower through holes 711 of the three through holes 711 (see FIG. 5) of the front elastic member 71 . In addition, the tip portion of the protruding portion 722 is arranged with a gap from the bottom portion in a state where the front elastic member 71 is pressed toward the bottom portion of the recess portion 382 . In addition, the outer peripheral portion of the projecting portion 722 is covered with the front elastic member 71 over the entire circumference. Therefore, the projecting portion 722 can relatively move within the recessed portion 382 while compressing the front elastic member 71 in any of the vertical direction, the front-rear direction, and the left-right direction. Thus, the front end portion 21 of the outer housing 2 is connected to the front end portion 31 of the inner housing 3 via the front elastic member 71 so as to be relatively movable in all directions.

The arrangement of the rear elastic member 76 will be described below. As shown in FIGS. 10, 12 and 16, recesses 203 that are elliptical in side view are provided on the left and right sides of the body portion 202 of the switch holder 20 arranged in the internal space 370 of the elastic connecting portion 37. It is A rear elastic member 76 having substantially the same configuration as the front elastic member 71 is fitted in each recess 203 . That is, the rear elastic member 76 has three through-holes 761 spaced apart from each other in the vertical direction. A projection provided on the bottom of the recess 203 is fitted in the central through hole 761 of these. As the rear elastic member 76, for example, a urethane foam having an ultrafine foam structure can be employed. In this embodiment, the rear elastic member 76 employs the same microcellular polyurethane elastomer as the front elastic member 71 .

On the other hand, the rear end portion 33 of the inner housing 3 is provided with a pair of arm portions 334 . The pair of arm portions 334 protrude obliquely forward from the front end of the control unit accommodating portion 332 so as to approach each other toward the front. Two protruding portions 335 protruding toward the rear elastic member 76 fitted in the concave portion 203 of the switch holder 20 are provided at the tip portion of the arm portion 334 . As shown in FIG. 16 , the two protrusions 335 are fitted in the upper and lower through holes 761 of the three through holes 761 of the rear elastic member 76 fitted in the recess 203 . The protruding portion 335 of the arm portion 334 is arranged with a gap from the bottom of the recess 203 in a state where the rear elastic member 76 is pressed toward the bottom of the recess 203 . In addition, the outer peripheral portion of the projecting portion 335 is covered with the rear elastic member 76 over the entire circumference. Therefore, the projecting portion 335 can relatively move within the recessed portion 203 while compressing the rear elastic member 76 in any of the vertical direction, the front-rear direction, and the left-right direction. Thus, the switch holder 20 as a part of the outer housing 2 is connected to the rear end portion 33 of the inner housing 3 via the rear elastic member 76 so as to be relatively movable in all directions.

In assembling the housing 1, the switch holder 20 is connected to the rear end portion 33 via the rear elastic member 76, and then connected to the upper shell 27 and the lower shell 27 via the cylindrical portion 206 as described above. It is fixed to shell 28 . In this embodiment, openings are formed between the elastic ribs 371 adjacent in the circumferential direction to communicate the internal space 370 with the outside. Therefore, as shown in FIG. 12, the switch holder 20 can be easily arranged in the internal space 370 through the openings between the elastic ribs 371 . Further, in the present embodiment, the cylindrical portion 206 and the recessed portion 203 of the switch holder 20 protrude from the internal space 370 to the outside through the opening. Therefore, after disposing the switch holder 20 in the internal space 370 , the switch holder 20 and the rear end portion 33 can be easily connected via the rear elastic member 76 . Also, the switch holder 20 can be easily connected to the upper shell 27 and the lower shell 28 .

A switching member 294 for switching the switch 29 between the ON state and the OFF state will be described below. As shown in FIG. 9, the upper portion of the switch 29 is provided with an operating portion 291 having a movable contact. The operating portion 291 is arranged so as to be movable in the front-rear direction between an ON position where the movable contact contacts the fixed contact and an OFF position where the movable contact is separated from the fixed contact. Note that the ON position is set forward of the OFF position. A switching member 294 is connected to the operating portion 291 .

A detailed configuration of the switching member 294 will be described. As shown in FIGS. 17 and 18, the switching member 294 is an elongated member linearly extending in the front-rear direction. A front end portion 295 of the switching member 294 is formed in a substantially rectangular shape that is one size larger than the operating portion 296 . An operating portion 296 is integrally formed on the upper surface of the front end portion 295 . A portion of the switching member 294 that extends rearward from the front end portion 295 is narrower in the left-right direction than the front end portion 295 and formed in a band shape that is longer in the front-rear direction. A rear end portion of the switching member 294 is connected to the operating portion 291 of the switch 29 . In addition, in the present embodiment, the switching member 294 is a single member made of synthetic resin. However, the switching member 294 may be formed by connecting a portion including the operating portion 296 and other portions.

The switching member 294 moves in the front-rear direction in accordance with the user's sliding operation in the front-rear direction of the operation unit 296, thereby moving the operation unit 291 between the ON position and the OFF position (that is, turning the switch 29 on). state and off state). In this embodiment, the switching member 294 is held by the guide member 8 supported by the outer housing 2 so as to be movable in the front-rear direction with respect to the outer housing 2 .

The configuration of the guide member 8 will be described below. As shown in FIGS. 17 to 19, the guide member 8 is supported by the lower shell 28 and the switch holder 20 of the outer housing 2. As shown in FIGS. Further, the guide member 8 is configured to hold the switching member 294 so as to be slidable in the front-rear direction, and to guide the sliding movement of the switching member 294 . In this embodiment, the guide member 8 includes a slide guide portion 81 and support legs 83 .

The slide guide portion 81 is a portion that holds the switching member 294 so as to be slidable in the front-rear direction and that guides the sliding movement. More specifically, the slide guide portion 81 is formed in an elongated shape extending in the front-rear direction, and has a shape that generally corresponds to the switching member 294 . That is, the front end portion 811 of the slide guide portion 81 is set wider in the horizontal direction than the rear portion. The slide guide portion 81 has a concave portion 813 extending in the front-rear direction on its upper surface. A switching member 294 is arranged in the recess 813 . The width of the portion of the concave portion 813 formed at the front end portion 811 in the left-right direction is substantially equal to the width of the front end portion 295 of the switching member 294, and the length in the front-rear direction is set to be larger than the length of the front end portion 295. there is Further, the width and length in the left-right direction and the length in the front-rear direction of the portion of the concave portion 813 that extends rearward from the front end portion 811 are the same as the width and length of the portion rearward from the front end portion 295 of the switching member 294 . are set approximately equal. An opening 815 is provided at the rear end of the slide guide portion 81 . A connecting portion between the rear end portion of the switching member 294 and the operating portion 291 of the switch 29 is arranged in the opening portion 815 .

Four support legs 83 protrude from each of the left and right sides of the front end portion 811 of the slide guide portion 81 . When viewed from the front, the four support legs 83 on the left side are each formed in an arc shape, protrude leftward from the left side of the front end portion 811, and curve downward. When viewed from the front, the four support legs 83 on the right side are each formed in an arc shape, and project rightward from the right side of the front end portion 811 symmetrically with the four support legs 83 on the left side, curved and extending downwards. Each support leg 83 has a locking projection 831 at its lower end. On the other hand, a locking hole 285 is provided in the upper end surface of the portion of the lower shell 28 that constitutes the front end portion 21 . The locking hole 285 is a recess into which the locking projection 831 can be fitted. Four locking holes 285 are provided on each of the left and right sides of the lower shell 28 corresponding to the support legs 83 .

In this embodiment, the guide member 8 is supported by the lower shell 28 and the switch holder 20 via the support leg 83 and the rear end portion of the slide guide portion 81 . Specifically, the locking projections 831 of the eight support legs 83 are fitted into the locking holes 285 of the lower shell 28 . A rear end portion of the slide guide portion 81 is mounted on the switch holder 20 . Although illustration is omitted, the rear end portion of the slide guide portion 81 is provided with a projection projecting downward. The rear end portion of the slide guide portion 81 is locked to the switch holder 20 by fitting the projection into a locking hole provided in the switch holder 20 .

In the process of assembling the vibration tool 100, the inner housing 3 is accommodated in the lower shell 28, and the switch holder 20 is elastically connected to the rear end portion 33 of the inner housing 3, as shown in FIG. Furthermore, after the guide member 8 holding the switching member 294 is supported by the lower shell 28 , the upper shell 27 is connected to the lower shell 28 . As shown in FIG. 19 , when the upper shell 27 is connected to the lower shell 28 , each support leg 83 extends into the outer housing 2 along the inner surface of the upper shell 27 while being separated from the inner housing 3 . placed.

Further, as shown in FIG. 15, the portion of the switching member 294 other than the operating portion 296 is located between the slide guide portion 81 (bottom surface of the recessed portion 813) and the inner surface of the upper shell 27 (lower surface of the upper wall portion). It is arranged so as to be slidable in the front-rear direction. On the other hand, as shown in FIG. 19 , of the switching member 294 , an operating portion 296 provided on the upper surface of the front end portion 295 is exposed to the outside through an opening 270 provided in the upper shell 27 . As shown in FIG. 1 , the width of the opening 270 in the left-right direction is substantially equal to that of the operating portion 296 , and the length of the opening 270 in the front-rear direction is set larger than that of the operating portion 296 . Therefore, the operating portion 296 can slide in the front-rear direction within the opening portion 270 .

Thus, in this embodiment, the switching member 294 is held by the guide member 8 supported by the outer housing 2 so as to be slidable in the front-rear direction. When the switching member 294 moves, the left and right side surfaces of the concave portion 813 of the guide member 8 restrict the lateral movement of the switching member 294 . In addition, the inner surface of the upper shell 27 and the bottom surface of the recess 813 restrict the movement of the switching member 294 in the vertical direction. That is, the concave portion 813 functions as a slide guide, and the guide member 8 guides the sliding movement of the switching member 294 in the front-rear direction. When the user slides the operation portion 296 forward from the rear initial position, the switching member 294 slides forward. Accordingly, when the operating portion 291 of the switch 29 is moved from the off position to the on position and the switch 29 is turned on, the motor 53 is driven. Further, when the user slides the operation portion 296 from the front position to the rear initial position, the switching member 294 slides rearward. Accordingly, when the operating portion 291 of the switch 29 is moved from the ON position to the OFF position and the switch 29 is turned OFF, the driving of the motor 53 is stopped.

Further, in this embodiment, the guide member 8 is configured to hold an illumination unit 89, which will be described later. Therefore, as shown in FIGS. 17 and 18, the guide member 8 has a lighting unit holding portion 85 projecting forward from the front end portion 811 of the slide guide portion 81 . The lighting unit holding section 85 includes a pair of arm sections 851 and a holding frame 853 . Each of the pair of arm portions 851 is substantially L-shaped in a side view, extends forward along the inner surface of the upper shell 27 from the left end and right end of the front end portion 811, and then bends downward. extends to The holding frame 853 is arranged to connect the front ends of the pair of arm portions 851 . The lighting unit 89 is fitted and locked to the holding frame 853 . As shown in FIG. 20, an opening 211 is provided in the upper portion of the front end portion 21 of the outer housing 2 (between the lower end of the upper shell 27 and the upper end of the lower shell 28). Retaining frame 853 is retained within opening 211 when upper shell 27 is coupled to lower shell 28 as described above.

As shown in FIG. 20, the illumination unit 89 is mainly composed of an LED board 891 and a case 893. As shown in FIG. A light-emitting diode (LED) as a light source is mounted on the LED substrate 891 . The case 893 is made of a translucent material (transparent resin, glass, etc.) and accommodates the LED substrate 891 . The lighting unit 89 is attached to the holding frame 853 so as to illuminate the work area (that is, the front area of the tool mounting portion 511) by the tip tool 91. As shown in FIG. Specifically, the illumination unit 89 is arranged so as to illuminate the front obliquely downward from the opening 211 .

In this embodiment, the guide member 8 is made of synthetic resin, and configured to hold wiring 895 for power supply to the lighting unit 89 (LED substrate 891 ) and guide it to the lighting unit 89 . In the vibration tool 100, the battery 93, which is a power supply, is attached to the rear end portion of the vibration tool 100 (more specifically, the battery mounting portion 331 of the inner housing 3). On the other hand, as described above, the illumination unit 89 for illuminating the working area of the tip tool 91 is arranged at the front end portion of the vibration tool 100 (specifically, the front end portion 21 of the outer housing 2). Therefore, the wiring 895 extends from the rear end portion to the front end portion of the vibration tool 100 with the holding portion 25 extending in a long shape interposed therebetween. Therefore, in this embodiment, the guide member 8 for the switching member 294 of the switch 29 , which is arranged so as to extend inside the grip portion 25 , is also used as a guide member for the wiring 895 .

More specifically, as shown in FIG. 18, the upper surface of the guide member 8 is formed with a guide groove 898 extending from the rear end to the front end of the guide member 8 . The guide groove 898 extends forward along the right end of the slide guide portion 81 from the right rear end of the slide guide portion 81 , and extends along the right arm portion 851 of the lighting unit holding portion 85 . It extends to the front end. The guide groove 898 is a groove having a larger cross-sectional area than the wiring 895 .

In this embodiment, as shown in FIG. 9 , one end of the wiring 895 is connected to the control unit 4 powered by the battery 93 via the battery mounting portion 331 . The wiring 895 extends forward from the control unit 4 under the switch holder 20 , bends upward at the front side of the switch holder 20 , and reaches the rear end of the guide groove 898 . Then, as shown in FIG. 18, it is fitted into the guide groove 898 and extends forward along the guide groove 898 . Furthermore, as shown in FIGS. 20 to 22, the wiring 895 is detached from the guide groove 898 at the tip of the arm portion 851 of the lighting unit holding portion 85 and connected to the LED substrate 891. As shown in FIG. As shown in FIGS. 8, 14, 15, 19, and 22, in the present embodiment, the guide member 8 is arranged along the inner surface of the upper shell 27 as described above. The guide groove 898 is substantially covered from above by the upper shell 27 . The wiring 895 is arranged in the housing space defined by the guide groove 898 and the inner surface of the upper shell 27 in this way from the rear end to the front end of the guide member 8 .

In addition, in the vibration tool 100 of this embodiment, a part of the metal member is exposed to the outside of the outer housing 2 . Specifically, the spindle accommodating portion 381 and the screw 623 connecting the operating lever 61 to the rotating shaft 62 are both metal members at least partially exposed to the outside. Therefore, in this embodiment, the outer housing 2 and the guide member 8 are positioned within the guide groove 898 to achieve protective insulation between the wiring 895 and the spindle housing 381 and between the wiring 895 and the pivot shaft 62 . It is configured to ensure a creeping distance for insulation between the wiring 895 arranged in the inner wall and the spindle accommodating portion 381 and the rotating shaft 62 .

For example, as shown in FIG. 22, in the portion of the arm portion 851 of the guide member 8 that extends downward in front of the spindle housing portion 381, the distance from the left end of the open end of the guide groove 898 to the spindle housing portion 381 is is relatively short. Therefore, as shown in FIGS. 22 and 17, this portion of the arm portion 851 is provided with a rib 852 projecting leftward. Therefore, the creepage distance between the wiring in the guide groove 898 and the spindle accommodation portion 381 is longer than when the rib 852 is not provided. In this embodiment, by providing the rib 852 on the arm portion 851 in this manner, a sufficient creepage distance is ensured.

20 and 21, a front end portion 896 of the wiring 895 from the tip of the arm portion 851 to the LED substrate 891 is not arranged inside the guide groove 898. As shown in FIGS. Also, the distance from the front end 896 to the spindle housing 381 is relatively short. Therefore, the holding frame 853 has a partition wall portion 854 interposed between the front end portion 896 of the wire 895 and the spindle accommodating portion 381 and protruding upward from the front end portion 896 . In this embodiment, by extending the partition wall portion 854 upward in this manner, a sufficient creepage distance is ensured between the front end portion 896 and the spindle accommodation portion 381 .

Furthermore, as shown in FIG. 8, in the central portion of the arm portion 851, the distance from the left end of the open end of the guide groove 898 to the eccentric portion 621 of the rotating shaft 62 is relatively short. For this reason, the inner surface of the upper shell 27 is provided with a first rib 275 projecting downward to face the guide groove 898 and a second rib 276 projecting downward between the arm portion 851 and the eccentric portion 621. It is The protruding length of the first rib 275 is set so as to contact the wiring 895 arranged in the guide groove 898, and the protruding length of the second rib 276 is substantially the same as the height of the arm portion 851 in the vertical direction. is set to It can also be said that the first rib 275 and the second rib 276 form a labyrinth structure (uneven structure) together with the guide groove 898 of the arm portion 851 . In this embodiment, by providing such a labyrinth structure, a sufficient creepage distance is ensured between the wiring 895 and the rotating shaft 62 .

The operation of the vibration tool 100 will be described below. The user attaches the tip tool 91 corresponding to the desired machining operation to the tool attachment portion 511, grips the grip portion 25, slides the operation portion 296, and switches the switch 29 to the ON state. The control unit 4 (specifically, the CPU) starts driving the motor 53 in response to the switch 29 being turned on. Note that the control unit 4 sets the rotation speed of the motor 53 based on the resistance value output from the speed change dial unit 26 . As the motor 53 is driven, the spindle 51 reciprocates about the axis A1 within a predetermined angular range, and the tip tool 91 swings within the swing plane OP (in the case of the illustrated blade, generally laterally). Let When the user presses the tip tool 91 against the workpiece, the vibration tool 100 can perform the machining operation.

As described above, in the vibration tool 100 of the present embodiment, the switching member 294 of the switch 29 is moved by the guide member 8 supported by the lower shell 28 and the switch holder 20 within the outer housing 2 . An operating portion 296 is held so as to be exposed to the outside through an opening 270 formed in the inner portion. In other words, the switching member 294 need not be sandwiched between the upper shell 27 and the lower shell 28 . Therefore, assembly of the switching member 294 to the switch 29 and the outer housing 2 can be facilitated. Further, since the guide member 8 holds the switching member 294 so as to be linearly movable in the front-rear direction between the upper shell 27 and the upper shell 27, the switching member 294 interferes with the internal mechanism (the inner housing 3, etc.) during movement. Possibility can be reduced. Thus, according to the guide member 8 of the present embodiment, the structure for holding the switching member 294 of the switch 29 can be rationalized.

Further, in the vibration tool 100 of this embodiment, the spindle 51 and the operating portion 296 are arranged at the front end portion 21, and the switch 29 is arranged at the rear end portion 33 with the grip portion 25 interposed therebetween. The guide member 8 extends in the front-rear direction within the grip portion 25 and holds the switching member 294 . By arranging the switch 29 at the rear end portion 23, the degree of freedom in designing the grip portion 25 can be increased. Specifically, the grip portion 25 can be thinned to some extent to improve the easiness of gripping. Further, according to the arrangement described above, the switching member 294 has a length corresponding to the grip portion 25, and the guide member 8 extending inside the grip portion 25 holds the switching member 294 stably. be able to.

Furthermore, in this embodiment, the lighting unit 89 is arranged at the front end portion 21 and the wiring 895 for power supply extends from the rear end portion 23 and connects to the lighting unit 89 . On the other hand, the guide member 8 also serves as a guide member that guides the wiring 895 from the rear end portion 23 to the front end portion 21 . Thus, by effectively utilizing the guide member 8 that holds the switching member 294 within the grip portion 25, a rational configuration for guiding the wiring 895 from the rear end portion 23 to the lighting unit 89 of the front end portion 21 is realized. be able to. Further, in this embodiment, the guide member 8 also serves as a holding member that holds the lighting unit 89 . In other words, by making more effective use of the guide member 8 that holds the switching member 294, it is possible to realize a rational configuration in which the illumination unit 89 is arranged at the front end portion.

In this embodiment, the guide member 8 has a guide groove 898 formed in a surface facing the inner surface of the outer housing 2 (specifically, the upper shell 27 ). A wiring 895 is held within a defined accommodation space. This can further reduce the possibility that the wiring 895 will come into contact with the internal mechanism (the inner housing 3, etc.) arranged in the outer housing 2, so that the wiring 895 can be protected more reliably.

In addition, in the present embodiment, the vibration tool 100 includes the inner housing 3 arranged in the outer housing 2 and the front elastic member 71 interposed between the inner housing 3 and the outer housing 2 and connecting them so as to be relatively movable. and a rear elastic member 76 . Accordingly, it is possible to suppress transmission of vibration generated in the inner housing 3 to the outer housing 2 as the spindle 51 is driven. Further, since the switching member 294 is held by the guide member 8 supported by the outer housing 2, it is possible to reduce the possibility that the operating portion 296 will interfere with the opening portion 270 due to vibration. Furthermore, since the lighting unit 89 and the wiring 895 are held by the guide member 8 supported by the outer housing 2, the lighting unit 89 and the wiring 895 are properly protected from vibrations, and problems such as poor contact and disconnection are prevented. can be suppressed.

[Second embodiment]
A vibration tool 101 according to the second embodiment will be described below with reference to FIG. 23 . The vibrating tool 101 of the present embodiment, like the vibrating tool 100 of the first embodiment (see FIG. 2), rotates the spindle 51 around the axis A1 within a predetermined angle range by the power of a motor 53 configured as a brushless DC motor. It is configured to reciprocate. However, as a power source for the vibrating tool 101, an external AC power source (commercial power source) is used instead of the battery 93 mounted in the battery mounting portion 331. FIG. Therefore, the rear end portion 330 of the inner housing 30 of the vibration tool 101 and its internal structure are different from the rear end portion 33 and its internal structure of the first embodiment. Other configurations of the vibration tool 101 are substantially the same as those of the vibration tool 100 of the first embodiment. Therefore, hereinafter, substantially the same configurations are denoted by the same reference numerals, illustration and description thereof are omitted or simplified, and different configurations are mainly described.

As shown in FIG. 23, the vibrating tool 101 has a housing 10 configured as a so-called anti-vibration housing, like the housing 1 of the vibrating tool 100 . The housing 10 includes an elongated outer housing 2 and an elongated inner housing 30 housed in the outer housing 2 . The inner housing 30 includes a front end portion 31 , an extension portion 35 , elastic connecting portions 37 (four elastic ribs 371 ), and a rear end portion 330 .

In the above-described first embodiment, the rear end portion 33 is provided with the battery mounting portion 331 as a power-related device that enables power supply from the battery 93 to the motor 53 (see FIG. 2). On the other hand, in the present embodiment, the rear end portion 330 is provided with a power-related device capable of supplying power to the motor 53 from an external AC power source. Specifically, as shown in FIG. 23 , a power cable 95 that can be connected to an AC power supply extends from the rear end of the rear end portion 330 . Further, inside the rear end portion 330, an AC-DC converter 41 connected to the power cable 95 and converting alternating current to direct current is accommodated.

In this embodiment, the AC-DC converter 41 converts direct current to alternating current and controls the driving of the motor 53 via a three-phase inverter 42 that drives the motor 53 using switching elements. A control unit 40 is configured together with the CPU 43 . Among the components of the control unit 40, the AC-DC converter 41 is the heaviest. The weight of the AC-DC converter 41 employed in this embodiment is the same as the weight of the battery 93 of the first embodiment. Note that at least one of the three-phase inverter 42 and the CPU 43 may be accommodated in a region near the motor 53 instead of the rear end portion 330 .

In this embodiment, the spindle 51, the motor 53, and the transmission mechanism 55, which are the heavy components of the vibration tool 101, are centrally arranged at the front end portion 31, while the AC-DC converter 41 is provided at the rear end portion 330. A configuration in which heavy objects are accommodated is adopted. Further, in this embodiment, in addition to the AC-DC converter 41, the three-phase inverter 42 and the CPU 43 are accommodated in the rear end portion 330, so that the weight of the internal structure of the rear end portion 330 is further increased. With such a configuration, it is possible to increase the moment of inertia of the inner housing 30, as with the mounting of the battery 93 in the first embodiment. Therefore, even when a certain amount of load is applied to the tip tool 91, it is possible to prevent the inner housing 30 from rotating unnecessarily with respect to the outer housing 2 about the axis A1. Also, by increasing the moment of inertia, the vibration itself generated in the inner housing 30 can be reduced. In addition, it goes without saying that the same effects as those of the vibration tool 100 of the first embodiment can be obtained.

Correspondence between each component of the above embodiment and each component of the present invention is shown below. The vibration tools 100 and 101 are examples of the "power tool" of the present invention. The motor 53 is an example of the "motor" of the present invention. Switch 29 is an example of the "switch" of the present invention. The outer housing 2, the upper shell 27 and the lower shell 28 are examples of the "housing", "first housing section" and "second housing section" of the present invention, respectively. The opening 270 is an example of the "through hole" of the present invention. The switching member 294 and the operating section 296 are examples of the "switching member" and the "operating section" of the present invention, respectively. The guide member 8 is an example of the "holding member" of the present invention.

The gripping portion 25, the front end portion 21, and the rear end portion 23 are examples of the "gripping portion", the "first end", and the "second end" of the present invention, respectively. Spindle 51 is an example of the "spindle" of the present invention. The lighting unit 89 is an example of the "lighting device" of the present invention. The wiring 895 is an example of the "wiring" of the present invention. Guide groove 898 is an example of the "groove" of the present invention. The transmission mechanism 55 is an example of the "transmission mechanism" of the present invention. The inner housing 3 is an example of the "support" of the present invention. Each of the front elastic member 71 and the rear elastic member 76 is an example of the "elastic member" of the present invention.

The above embodiment is merely an example, and the work tool according to the present invention is not limited to the configurations of the vibration tools 100 and 101 illustrated. For example, the modifications exemplified below can be made. It should be noted that one or more of these modifications can be employed in combination with the vibration tools 100 and 101 shown in the embodiments or the inventions described in the claims.

In the above-described embodiment, as an example of the power tool according to the present invention, the power of the motor 53 reciprocates the spindle 51 within a predetermined angle range, thereby swinging the tip tool 91 attached to the spindle 51. Vibration tools 100 and 101 configured as above are illustrated. However, electric power tools to which the present invention can be applied are not limited to the vibration tools 100 and 101 . In particular, the present invention is suitable for a type of power tool that has an elongated housing that includes a grip portion and that switches a switch between an on state and an off state by linearly operating the operation portion in a predetermined direction. applicable to Examples of such power tools include joint cutters, nibblers, straight shears, grinders, trimmers, board cutters, angle drills, and the like.

The shape and arrangement of the switching member 294 that switches the switch 29 between the ON state and the OFF state may be changed as appropriate. For example, the front end portion 295 including the operation portion 296 and the elongated portion extending rearward from the front end portion 295 may be configured as separate members and connected to each other. The operation part 296 may be arranged so as to be exposed to the outside through a through hole provided in the upper surface or the lower surface of the front end of the grip part 25 .

The shape of the guide member 8 and the manner of support by the outer housing 2 can be changed as appropriate. For example, although the guide member 8 in the above embodiment is configured to hold the switching member 294 over its entire length, the guide member 8 may hold only a portion of the switching member 294 . Also, the guide member 8 may be supported only by the lower shell 28 or may be supported only by the upper shell 27 . Also, the guide member 8 may include a plurality of portions that are connected to each other, or may include a plurality of portions that are spaced apart from each other. For example, a portion of the switching member 294 supported by the lower shell 28 within the front end 21 to hold the front end 295 and a portion of the switch member 294 supported by the lower shell 28 or the switch holder 20 within the grip portion 25 or the rear end 23 . In addition, a portion that holds the portion rearward of the front end portion 295 of the switching member 294 may be separately provided.

The guide member 8 does not necessarily have the function of holding the lighting unit 89 and the function of holding and guiding the wiring 895 . That is, the lighting unit holding portion 85 and the guide groove 898 may be omitted. In addition, the wiring 895 does not need to be arranged in the guide groove 898 substantially over the entire length of the guide member 8. It may be held by the member 8 .

The housings 1 and 10 do not have to be so-called anti-vibration housings having a two-layer structure including the outer housing 2 and the inner housings 3 and 30 . That is, the housings 1 and 10 may be housings as hollow bodies having a one-layer structure. Further, when the front elastic members 71 are provided, the number, shape, and arrangement position thereof are such that the outer housing 2 and the inner housings 3, 30 can be elastically moved in all directions (back and forth, left and right, and up and down directions). It can be changed as appropriate as long as it can be directly connected. The same applies to the rear elastic member 76 as well.

The configurations of the inner housings 3 and 30 may be changed as appropriate. For example, the inner housing 3 need not house the drive mechanism 5 and other internal structures so as to cover them, and may support at least a portion of the drive mechanism 5 and other internal structures. Also, the shapes of the metal housing 38 and the resin housing 39 may be changed, and the inner housings 3 and 30 may be made of a single material. Further, the inner housing 3 does not necessarily have the rear end portions 33 and 330 connected to the front end portion 31 via the elastic connecting portion 37 .

Also, the configuration and arrangement of the drive mechanism 5 (the motor 53, the spindle 51 and the transmission mechanism 55) may be changed as appropriate. For example, the motor 53 may be arranged such that the axis A2 of the output shaft 531 is perpendicular to the axis A1 of the spindle 51 . In this case, the motor 53 may be arranged in a region of the inner housing 3 corresponding to at least part of the grip portion 25 . Also, as the motor 53, a motor having brushes may be employed instead of a brushless motor.

Furthermore, in view of the spirit of the present invention and the above-described embodiments and modifications thereof, the following aspects are constructed. The following aspects can be employed in combination with the vibration tools 100 and 101 shown in the embodiments, the above modifications, or the inventions described in each claim.
[Aspect 1]
The holding member is a concave portion or a convex portion extending in the predetermined direction, and has a slide guide portion that contacts at least a part of the switching member and holds the switching member slidably in the predetermined direction. You may have
[Aspect 2]
The switch may be supported by the housing.

100, 101: vibration tools 1, 10: housing 2: outer housing 21: front end 211: opening 23: rear end 25: central portion (holding portion)
26: Variable speed dial unit 261: Dial 27: Upper shell 270: Opening 271: Cylindrical part 273: Cylindrical part 275: First rib 276: Second rib 28: Lower shell 281: Through hole 283: Cylindrical part 285: Engaging Stop hole 29: Switch 291: Operating portion 294: Switching member 295: Front end portion 296: Operation portion 20: Switch holder 202: Body portion 203: Concave portion 206: Cylindrical portion 207: Screws 3, 30: Inner housing 31: Front end portion 311 : Motor cover portions 33, 330: Rear end portion 331: Battery mounting portion 332: Control unit accommodating portion 334: Arm portion 335: Protruding portion 35: Extension portion 37: Elastic connecting portion 370: Internal space 371: Elastic rib 38: Metal housing 381: Spindle accommodating portion 382: Concave portion 383: Motor accommodating portion 387: Contact portion 39: Resin housing 391: Left shell 392: Right shell 393: Cylindrical portion 394: Cylindrical portion 300: Weight 301: Front portion 302: Rear Side portion 304: Through hole 308: Screws 4, 40: Control unit 41: AC-DC converter 42: Three-phase inverter 43: CPU
5: Drive Mechanism 51: Spindle 511: Tool Mounting Part 52: Clamp Shaft 521: Clamp Head 523: Groove 53: Motor 530: Motor Body 531: Output Shaft 55: Transmission Mechanism 551: Eccentric Shaft 553: Swing Arm 555: Drive bearing 6: Lock mechanism 61: Operation lever 62: Rotating shaft 621: Eccentric portion 623: Screw 63: Compression coil spring 65: Collar 67: Clamp member 671: Projection 71: Front side elastic member 711: Through hole 72: Connection Member 721: Cylindrical portion 722: Protruding portion 724: Cylindrical portion 725: Base portion 726: Screw 76: Rear elastic member 761: Through hole 8: Guide member 81: Slide guide portion 811: Front end portion 813: Concave portion 815: Opening 83: Support leg 831: Locking protrusion 85: Lighting unit holding part 851: Arm part 852: Rib 853: Holding frame 854: Partition wall part 89: Lighting unit 891: LED board 893: Case 895: Wiring 896: Front end part 898: Guide groove 91: Tip tool 93: Battery 95: Power cable A1: Axis line A2: Axis line OP: Swing plane VP: Vertical plane

Claims (11)

A power tool configured to drive a tool bit, comprising:
a motor;
a switch for driving and stopping the motor;
a hollow body formed by a first housing part having a through hole and a second housing part connected to the first housing part, the housing accommodating the motor and the switch;
A switching member connected to the switch, including an operation portion exposed to the outside from the through hole so as to be movable in a predetermined direction in response to manual operation by a user, a switching member configured to move linearly in a direction to switch the switch between an on state and an off state;
a holding member configured to hold the switching member so as to be linearly movable in the predetermined direction;
the switch is contained within the housing such that it cannot be manually operated by the user;
The holding member is fixedly supported within the housing by the connection between the first housing portion and the second housing portion,
A power tool, wherein a portion of the switching member that extends from the operation portion to the switch is arranged between the holding member and an inner surface of the first housing portion. The power tool according to claim 1,
The housing is formed in an elongated shape extending in the predetermined direction, and includes a grip portion configured to be grippable by a user, and first end portions connected to both sides of the grip portion in the predetermined direction. and a second end;
the power tool further comprising a spindle disposed within the first end and configured to drive the removably mounted tip tool by power of the motor;
the operating portion and the switch are disposed within the first end and the second end, respectively;
The power tool, wherein at least part of the holding member extends in the predetermined direction within the holding portion to hold the switching member. The power tool according to claim 2,
an illumination device disposed at the first end and configured to illuminate a working area of the tip tool;
a power supply wiring extending from the second end and connected to the lighting device;
The power tool, wherein the holding member is configured to guide the wiring from the second end to the first end. The power tool according to claim 3,
The power tool, wherein the holding member holds the lighting device. The power tool according to claim 3 or 4,
the holding member has a groove formed in a surface facing the inner surface of the housing;
An electric power tool, wherein the wiring is held within a receiving space defined by the groove and the inner surface of the housing. The power tool according to any one of claims 2 to 5,
The spindle is rotatably supported around an axis intersecting the predetermined direction,
The power tool includes a transmission mechanism configured to transmit rotational motion of the output shaft of the motor to the spindle and reciprocate the spindle within a predetermined angular range around the axis. and power tools. The power tool according to any one of claims 2 to 6,
a support, separate from the holding member, disposed within the housing and supporting at least the motor and the spindle;
The power tool further comprising an elastic member interposed between the support and the housing and connecting the support and the housing so as to be relatively movable. The power tool according to any one of claims 1 to 7,
The holding member includes a slide guide portion that holds the switching member so as to be slidable in the predetermined direction, and a plurality of support legs projecting from the slide guide portion,
A power tool, wherein the end of the support leg is fixedly held between the first housing part and the second housing part which are connected to each other. The power tool according to claim 8,
The power tool, wherein the portion of the switching member that extends from the operating portion to the switch is slidably held between the holding member and the inner surface of the first housing portion. . The power tool according to claim 8 or 9,
The first housing portion and the second housing portion are respectively an upper shell and a lower shell that are connected to each other in a state of being superimposed in the vertical direction of the power tool,
The slide guide portion faces the upper wall of the upper shell,
The power tool, wherein the support leg extends along the inner surface of the upper shell from the slide guide portion toward the lower shell. The power tool according to any one of claims 1 to 10,
The power tool further comprises a switch holder fixedly connected to the first housing portion and the second housing portion and supporting the switch and the holding member.

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