JP5769017B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool, and more particularly to a power tool that is reduced in size.

  In a power tool, for example, an impact tool such as an impact driver, as shown in Patent Document 1, a hammer case having a motor and a striking mechanism is built in a main body housing, and the tool is mounted on an anvil protruding forward of the hammer case. Can be installed. A switch trigger for driving the motor is provided at a lower position of the hammer case in the main body housing, and the work material to be operated with the tip tool mounted on the anvil and the tip tool can be irradiated in the vicinity of the switch trigger. An LED light is provided.

  Since the LED light emits light so as to diffuse toward the tip tool and the vicinity of the tip tool, the LED light needs to be separated from the tip tool in order to irradiate the tip tool and the vicinity of the tip tool. Therefore, it is possible to earn a distance from the LED light to the tip tool by forming a hole in the housing and disposing the LED light at the bottom of the hole.

  Further, the surface of the housing is covered with a soft resin coating such as an elastomer so as not to damage the workpiece when the tool comes into contact with the workpiece and to absorb the impact to the tool body.

JP 2008-30126 A

  Since the elastomer is provided for protecting the workpiece as described above, the surface located around the opening of the hole in which the LED light is arranged is also covered with the elastomer. In this case, there is a possibility that the elastomer may be rolled up and peeled off from around the perforation opening or may be damaged. Therefore, an object of this invention is to provide the electric tool which aimed at protection of soft resin coating.

In order to solve the above-described problems, the present invention provides a motor that drives a tip tool holding portion that holds a tip tool, a housing that holds the motor , and a tool that is attached to the housing to irradiate the tip tool and the vicinity of the tip tool. And the housing has an extending portion that is disposed in the vicinity of the tip tool holding portion and holds the lighting portion, and has a soft resin coating that covers at least a part of the extending portion. The extending portion is formed with an opening that opens to the tip side of the tip tool and is perforated toward the opposite tip side, and the illumination portion is disposed at the bottom of the opening, and the extension standing wall projecting toward the distal end side to the opening portion is provided so as to surround the opening in the part surface, the soft resinous coating covers the portion other than the opening in the surface of the extension portion , the soft resinous coating and the openings, upstanding walls To provide an electric tool, characterized in that they are more separated.

  According to such a configuration, the opening that is a perforation is surrounded by the standing wall, and the soft resin coating is covered up to the standing wall, so that the opening side end of the soft resin coating is covered by the standing wall. Thereby, it is suppressed that the opening side edge part of a soft resin coating peels. In addition, when the soft resin coating is applied to the housing, the soft resin coating is suppressed from being applied in the opening by being blocked by the standing wall, and the productivity of the electric tool can be increased.

In the electric tool having the above-described configuration, a power transmission portion interposed between the motor and the tip tool holding portion is incorporated, and the case further supports the tip tool holding portion and is covered with the housing. the housing, to have a screw boss in the vicinity of the tip end tool holding portion covers both to the tip tool holding part bearing point vicinity of the case, the soft resinous coating is provided so as to cover up to the vicinity of bearing point tip end tool holding portion Preferably it is.

  According to such a configuration, the number of parts can be reduced to increase productivity, and the workpiece can be more reliably protected with the soft resin coating.

  According to the electric tool of the present invention, productivity can be improved while suppressing peeling of the soft resin coating.

Side surface sectional drawing of the impact driver which concerns on embodiment of this invention. The principal part sectional view of the impact driver concerning an embodiment of the invention. The principal part perspective view of the impact driver which concerns on embodiment of this invention. In the impact driver, the figure which compared (a) the structure with a standing wall, and (b) the structure without a standing wall.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The impact driver 1, which is a striking tool shown in FIG. 1, is rotated by repeating forward and reverse rotation of the motor while fastening bolts, nuts, and screws with a tip tool such as a bit 1A (FIG. 2) or a socket (not shown). This is a tool that applies striking force and is mainly composed of a housing 2, a motor 3, a gear mechanism 4 and an impact mechanism 5 as power transmission parts, and is downsized driven by a rechargeable battery 6 as a power source. Tool.

  The housing 2 is a resin housing made of 6 nylon, and includes a body part 2A in which the motor 3 and the like are accommodated, and a handle 2B extending from the body part 2A. The inside of the body part 2A and the handle 2B A housing space is defined, and the housing is divided into two substantially symmetric divided housings in a plane extending in the up-down direction and the front-rear direction, which will be described later. The motor 3, the gear mechanism 4, and the impact mechanism 5 are coaxially arranged from one end side to the other end side at a location corresponding to the body portion 2 </ b> A in the accommodation space. In the axial direction in which the motor 3, the gear mechanism 4, and the impact mechanism 5 are arranged, the motor 3 side is defined as the rear side and is defined as the front-rear direction. In addition, the vertical direction is defined with the direction perpendicular to the front-rear direction and the handle 2B extending from the body portion 2A as the downward direction, and the horizontal direction with the upper direction in FIG. Define.

  In the body portion 2A, an exhaust port 2a and an intake port 2b (FIG. 3) are formed at the front and rear positions of the motor 3 and the left and right side surfaces of the body portion 2A, respectively. In the housing 2, a terminal portion 21 to which the battery 6 is mounted and electrically connected is disposed at the lower end position of the handle 2 </ b> B. A control circuit unit 100 for controlling the rotation of the motor 3 and the light irradiation of a light unit 25 described later is disposed above the terminal unit 21. A trigger 23A that is operated by an operator is provided at the base of the handle 2B, and a switch 23B that is connected to the trigger 23A and the control circuit unit 100 and controls conduction to the motor 3 and a rotation direction of the motor 3 are switched. A reverse switching lever 23C (FIG. 3) is provided. The body portion 2A extends forward so as to cover a hammer case 51, which will be described later, up to the vicinity of the front end thereof.

  At the base of the handle 2B and above the trigger 23A, there is provided an extending portion 2C that extends downward from the body portion 2A and extends forward from the handle 2B. The extending portion 2C also forms a part of a split housing that is divided into left and right, like the body portion 2A and the handle 2B.

  As shown in FIG. 2, the extending portion 2 </ b> C is formed with an opening 2 c that opens to the front end side of the bit 1 </ b> A that is the front side and is pierced toward the rear side that is the opposite end side to form a mortar shape. The LED light unit 25 that is an illumination unit that is connected to the control circuit unit 100 and irradiates the front side is provided at a position corresponding to the bottom of the opening 2c. By disposing the LED light unit 25 at this position, a distance from the LED light unit 25 to the tip of the bit 1A can be secured, and a wide area irradiated by the LED light unit 25 can be secured.

  The LED light unit 25 is configured by arranging an LED element 25A on a substrate 25B, and has a conductive wire 25C connected to the control circuit unit 100. The LED element 25A and the like are covered with a transparent protective cover 25D. Protected.

  As shown in FIGS. 2 and 3, the opening 2c on the surface of the extending portion 2C is provided with a standing wall 2D protruding toward the front so as to be integrated with the extending portion 2C so as to surround the opening 2c. Yes. Therefore, the opening 2c is separated from the surface of the extended portion 2C by the standing wall 2D.

  On the surface of the housing 2, the front side of the body portion 2 </ b> A, the handle 2 </ b> B, and the extending portion 2 </ b> C are covered with an elastomer 2 </ b> E. This elastomer 2E is a soft resin coating based on a polyurethane elastomer resin, and covers the above-mentioned surface so as to cover uniformly. More specifically, on the surface of the extended portion 2C, the elastomer 2E is constructed up to the position of the standing wall 2D so that the elastomer 2E does not enter the opening 2c surrounded by the standing wall 2D.

  In the body portion 2A, as shown in FIG. 1, the front end position of a hammer case 51, which will be described later, the upper and lower portions of the hammer case 51, the vicinity of the gear mechanism 4 and the upper and lower portions of the gear mechanism 4, and the motor 3 Screw bosses 2F are provided at the rear position and at the upper and lower parts of the motor 3, respectively. In the handle 2B, two screw bosses 2F are provided below the switch portion 23B and two connection bosses 2F. .

  The motor 3 is a DC brushless motor, and mainly includes a stator 31, a rotor 32, and a motor drive circuit device 33. The stator 31 is formed in a cylindrical shape, forms an outer shell of the motor 3, and an outer peripheral surface is held by the housing 2.

  The rotor 32 is rotatably arranged in the stator 31, and a rotor shaft 32 </ b> A extending in the front-rear direction is provided at the rotation axis position so as to rotate coaxially and integrally. At the front end of the rotor shaft 32A, a fan 32B and a pinion gear 32C are mounted so as to rotate coaxially together, and a bearing 32D is mounted and supported by the body portion 2A. A bearing 32E is attached to the rear end of the rotor shaft 32A and is supported by the body portion 2A. The rotor shaft 32A is rotatably supported by these bearings 32D and 32E. When the fan 32B rotates integrally with the rotor shaft 32A, an airflow is formed that passes from the air inlet 2b through the space inside the body portion 2A to the exhaust port 2a.

  A motor drive circuit device 33 that is a circuit board is arranged behind the stator 31 and fixed to the stator 31, includes a plurality of switching elements, and rotates the rotor 32 forward and backward based on signals from the control circuit unit 100. I am letting.

  A gear mechanism 4 is disposed on the front side of the motor 3 in the body portion 2A. The gear mechanism 4 is a planetary gear mechanism in which the pinion gear 32C is a sun gear, and is mounted on the housing 2 with a case 51 described later as an outer shell. The gear mechanism 4 includes a spindle 41, a ring gear 42, and a plurality of planetary gears 43. Has been. The spindle 41 is a planet carrier that supports a plurality of planetary gears 43, and is mainly composed of a flange 41 </ b> A that supports the planetary gears 43. A substantially cylindrical front-side supported portion 41B is provided at the front end of the flange portion 41A and at the rotational center position, and is engaged with a perforation 52a of the anvil 52, which will be described later, and is rotatably supported on the anvil 52 with the front-rear direction as the rotational axis direction. A rear-side supported portion 41C that is rotatably supported by the body portion 2A via a bearing 4B is provided at the rear end of the flange portion 41A and at the rotational center position. The rear supported portion 41C is configured in a cylindrical shape, and the pinion gear 32C is inserted through the inside. Further, in the flange portion 41A, claw portions 53A and 53A, which are a pair of hammers protruding toward the front side, are provided at the radially outward position of the front supported portion 41B. The claw portions 53A and 53A are arranged at positions 180 degrees apart around the axis, and are formed in a symmetrical shape around the axis.

  The ring gear 42 is disposed so as to be coaxially positioned on the outer periphery of the spindle 41 and is fixed to a case 51 described later so as not to rotate. Each of the plurality of planetary gears 43 is rotatably supported by the flange portion 41A, meshed with the ring gear 42, and meshed with the pinion gear 32C. With the above configuration, the rotation of the pinion gear 32C is decelerated and transmitted to the spindle 41.

  The impact mechanism 5 mainly includes a hammer case 51, an anvil 52, and the aforementioned claw portions 53A and 53A.

  The hammer case 51 has a cylindrical shape with a narrowed front end, is covered and held by the body portion 2A of the housing 2, and has a bearing 51A that rotatably supports the anvil 52 at the front end portion.

  The anvil 52 is formed in a cylindrical shape extending in the front-rear direction, is rotatably supported by the hammer case 51 by a bearing 51A, and the tip end portion of the spindle 41 is fitted in a clearance in a bore 52a formed at the rear end. 41 is rotatably supported. In the anvil 52, the cylindrical portion corresponds to the tip tool holding portion. At the front end portion of the anvil 52, a tip tool mounting portion 52A to which a socket (not shown) is mounted is provided. The tip tool mounting portion 52A includes a plurality of balls 52C that can project into a mounting hole 52b formed at the front end of the anvil 52, and are biased rearwardly by a spring and balls 52C in a state of being biased rearward. It is mainly composed of an operation portion 52D that comes into contact with and protrudes the ball 52C into the mounting hole 52b. Further, at the rear end of the anvil 52, blade portions 52E and 52E which are a pair of engaged portions respectively extending in the radial direction and in the opposite directions are integrally provided. When the claws 53A and 53A come into strong contact with the blade portions 52E and 52E, a rotational impact force is applied to the anvil 52. When the control circuit unit 100 performs control to keep the motor 3 rotating normally, the claw portion 53A continues to contact the blade portion 52E, so that no striking force is applied to the anvil 52. On the other hand, when the motor 3 is rotated in the forward direction, when the control to slightly reverse the motor 3 is performed, the blade portion 52E and the claw portion 53A are separated by the reverse rotation of the motor, and then the motor 3 is moved. By rotating forward, the claw portion 53A comes into strong contact with the blade portion 52E, and a striking force is applied.

  In the impact driver 1 having the above-described configuration, the impact driver 1 has a structure in which the elastomer 2E is applied to the surface of the housing 2, in particular, the position in the vicinity of the front end of the body portion 2A that is opposed to the workpiece and the extending portion 2C. Even if it contacts the workpiece, the workpiece is prevented from being damaged. In the extended portion 2C, since the opening 2c is surrounded and blocked by the standing wall 2D, the elastomer 2E does not enter the opening 2c during manufacturing, and the productivity is improved.

  Further, as shown in FIG. 4A, since the elastomer 2E located around the opening 2c is partitioned by the standing wall 2D, the end E of the elastomer 2E located around the opening 2c can be rolled. It is suppressed. If the configuration is such that there is no standing wall 2D as shown in FIG. 4B, the end E of the elastomer 2E is opened into the opening 2c at the position of the opening 2c, so that the end E from the position of the opening 2c. There is concern that it will drown and peel off. On the other hand, in the configuration of the present embodiment shown in FIG. 4A, the end E of the elastomer 2E is not opened into the opening 2C by being partitioned by the standing wall 2D. It is also suppressed that the end E is curled and peeled off.

  In addition, the housing 2 is integrally formed by a plurality of divided housings by a plurality of screw bosses 2F. In particular, by disposing the screw bosses 2F at the front end position of the hammer case 51 and at the upper and lower portions of the hammer case 51, the body portion 2A extended so as to cover the hammer case 51 is easily and securely screwed and fixed. Can increase productivity.

  The power tool of the present invention is not limited to the above-described impact driver, and can be widely used for a power tool that covers an elastomer and has an opening in which an illumination unit is disposed.

1: Impact driver 1A: Bit 2: Housing 2A: Body 2B: Handle 2C: Extension 2D: Standing wall 2E: Elastomer 2F: Screw boss 2a: Exhaust port 2b: Inlet port 2c: Opening unit 3: Motor 4: Gear mechanism 4B: Bearing 5: Impact mechanism 6: Battery 21: Terminal part 23A: Trigger 23B: Switch part 23C: Forward / reverse switching lever 25: Light unit
25A: LED element 25B: Substrate 25C: Conductor wire 26: Illumination part 31: Stator 32: Rotor 32A: Rotor shaft 32B: Fan 32C: Pinion gear 32D: Bearing 32E: Bearing 33: Motor drive circuit device 41: Spindle 41A: Hook 41B : Front supported part 41C: Rear supported part 42: Ring gear 43: Planetary gear 51: Hammer case 51A: Bearing 52: Anvil 52A: Tip tool mounting part 52C: Ball 52D: Operating part 52E: Blade part 52a: Drilling 52b : Mounting hole 53A: Claw part 100: Control circuit part

Claims (2)

A motor for driving a tip tool holding portion for holding the tip tool;
A housing for holding the motor ;
And a lighting unit for illuminating the vicinity of the tip tool and tip tool mounted to the housing,
The housing has an extending portion that is disposed near the tip tool holding portion and holds the illumination portion, and has a soft resin coating that covers at least a part of the extending portion,
The extension portion is formed with an opening that opens to the tip side of the tip tool and is drilled toward the opposite tip side, and the illumination portion is disposed at the bottom of the opening portion. standing wall projecting toward the distal end side is provided so as to surround the opening in the opening at the surface,
The soft resin coating covers a portion other than the opening on the surface of the extended portion,
The power tool characterized in that the soft resin coating and the opening are separated by the standing wall. A power transmission portion interposed between the motor and the tip tool holding portion; and a case that supports the tip tool holding portion and is covered by the housing;
The housing cover together to have a screw boss in the vicinity of the tip end tool holding portion to the tip tool holding part bearing point vicinity of the casing,
The electric tool according to claim 1, wherein the soft resin coating is provided so as to cover up to the vicinity of the support position of the tip tool holding portion.

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