CN201824333U - Power tool provided with working component clamping device - Google Patents

Abstract

The utility model provides a power tool with a working element clamping device, comprising: a working mandrel for driving the working element, a fastening element with a clamping portion and an extension shaft, the extension shaft Insertable into the working mandrel, a holding assembly having a first position for holding the extension shaft and a second position for disengaging the extension shaft, wherein: a pressing element is also included in the holding assembly When in the first position, the working element can be compressed between the pressing element and the clamping portion. The utility model fastens the working element to the working mandrel in a simple and reliable manner without the use of auxiliary tools such as wrenches, and enables a strong clamping force, even in tools driven, for example, by means of a vibratory drive Even in the event of shocks, this clamping force is sufficient to ensure a reliable and secure clamping of the working element.

Description

Power tool with working element clamping device

technical field

The utility model relates to a power tool, which comprises a working spindle for driving the tool and a fastening element for clamping a working element to the end of the working spindle, and also includes a fastening element for making the fastening A moving device in which the fastening element can move between a release position and a clamping position, in which the fastening element can be removed from the working mandrel by disengaging from the moving device, and vice versa, in the clamping position, the fastening element Through the locking of the moving device and the cooperative action of the elastic element, the end of the working mandrel is supported so that the working element is securely clamped.

Background technique

Known from US006569001B2 is a power tool with a quick clamping device, the handheld tool is an angle grinder, and the angle grinder is equipped with a hollow working mandrel, and the hollow mandrel is equipped with a A clamping device that moves between a clamped position and a released position, the clamping device includes a clamping flange with a threaded pin in the middle, the clamping flange is used for the opposite flange at the end of the hollow mandrel Cooperate so that the working element is clamped between the two, and a thrust member that cooperates with the threaded pin is also provided in the hollow shaft. When in the clamping position, the threaded pin is screwed into the thread of the thrust member and under the action of the spring force Keeping at the clamping position, when in the release position, the thrust member pushes the threaded pin to drive the clamping flange to overcome the spring force and disengage from the surface of the clamped working element, because at this time the clamping flange and the clamped working component There is no frictional force when they rotate relative to each other, so the threaded pin of the clamping flange can be manually unscrewed out of the thrust member without the help of accessories, and the working element can be easily replaced.

Although this clamping device basically clamps the working element to the working spindle of the hand tool without auxiliary tools, this clamping device is only suitable for clamping the working element that is driven in rotation, if the working element is driven by vibration device is driven so that the working element oscillates back and forth along the longitudinal axis of the working mandrel, this results in a large abrupt torque in both directions of rotation and has a very large impact, which cannot be achieved by known clamping devices To ensure that the working element is fully and firmly clamped.

Contents of the invention

Aiming at the above-mentioned defects in the prior art, the utility model provides a power tool, which fastens the working element to the working mandrel in a simple and reliable manner without using auxiliary tools such as wrenches, and can A high clamping force is achieved, which is sufficient to ensure a reliable and secure clamping of the working element even in the event of shocks such as occur in tools driven by vibration drives.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A power tool with a working element clamping device comprising:

a working spindle for driving said working element,

a fastening element having a clamping portion and a protruding shaft insertable into the working mandrel,

a holding component, having a first position for holding the extension shaft and a second position for disengaging the extension shaft,

Wherein: a pressing element is also included, and when the holding component is in the first position, the working element can be pressed between the pressing element and the clamping part.

The holding component is movable between the first position and the second position, and the moving direction is substantially perpendicular to the extending shaft.

A moving device for moving the holding assembly is also included.

The displacement device is partially arranged on the pressing element.

The displacement device is partially arranged on the pressing element.

The moving device also includes an intermediate piece that can abut against the holding assembly, and the pressing element is provided with an A position and a B position, and the A position and the B position are on a radial direction perpendicular to the extension shaft. There is a height difference in the vertical direction, and the middle piece can be selectively placed in the A position or the B position.

The intermediate piece is a steel ball or a cylindrical pin.

The radial height difference between the A position and the B position on the pressing element is configured as a stepped surface or a groove.

A biasing element acting on the pressing element biases it toward the clamping portion.

The biasing element includes a first elastic element.

It also includes an operating device for moving the pressing element in a direction against the force exerted by the first elastic element.

The operating device includes a lever element that can rotate around an axis. One end of the lever element is abutted against a cam wrench, and the other end is selectively abutted against an actuating portion provided on the pressing element.

The operating device includes a rotating shaft and an operating element that makes the rotating shaft rotate around its axis. The rotating shaft is provided with an eccentric convex surface, and the eccentric convex surface can selectively abut against the pressing element. on the actuating part.

Matching shaped locking structures are provided on the holding component and the extending shaft.

The form-locking structure includes a tooth portion on the protruding shaft and a mating tooth portion on the retaining component.

It also includes a second elastic element acting on the holding assembly and exerting a force on it in the D direction, the D direction is consistent with the direction in which the extension shaft is inserted into the working mandrel.

It also includes a protrusion for limiting the circumferential rotation of the working element, and the protrusion is arranged on the driving end surface of the working mandrel or on the pressing end surface of the pressing element.

The working mandrel is provided with an anti-loosening element for preventing the extension shaft from falling off freely.

By adopting the above technical solution, the power tool of the present invention has a quick clamping device for the working element, which is convenient to use and labor-saving, and has a simple and compact structure, and the cost is greatly reduced.

Description of drawings

Fig. 1 is the cross-sectional view of the preferred embodiment of the power tool of the present invention, wherein the clamping device for clamping the working element is in the clamping state;

Fig. 2 is a sectional view of the power tool of the present invention, wherein the clamping device for clamping the working element is in a released state;

Fig. 3 is a structural schematic diagram of a shift fork used to move the pressure ring in the clamping device;

Fig. 4 is a structural schematic diagram of a pressure ring used to press the working element to the clamping part of the fastening element in the clamping device;

Fig. 5 is a schematic diagram of a holding assembly installed on the working mandrel, wherein one end of the holding assembly is equipped with a spring to make it float;

Fig. 6 is a sectional view of another embodiment of the power tool of the present invention;

Fig. 7 is a schematic structural view of the pressure ring in Fig. 6;

Fig. 8 is a schematic diagram of another embodiment of the power tool of the present invention;

FIG. 9 is an external schematic diagram of the power tool in FIG. 8 .

Detailed ways

The specific implementation of the power tool of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, the power tool of the present invention comprises: a working mandrel 2, 2' for driving the working element 9, the working mandrel 2, 2' is driven by the vibrating support 3 with respect to its longitudinal axis Y and Driven by a small pivot angle and high frequency vibration, one end of the working mandrel 2, 2' is configured as a substantially tubular part of the mandrel tube 21, and the driving end surface of the outer end of the mandrel tube 21 is provided with a limiting working element 9 protrusions 22 that rotate in the circumferential direction; the fastening element 10 includes a clamping portion 102 and a protruding shaft 103 protruding from the clamping portion 102, the protruding shaft 103 can be inserted into the mandrel tube 21, and can be installed by The holding assembly on the mandrel tube 21 is held or released, the extension shaft 103 is provided with a tooth portion 101, the holding assembly includes a locking block 11, and the locking block 11 is provided with the tooth portion 101 on the extension shaft 103 to cooperate The matching tooth portion 111 of the mandrel tube 21 is provided with a pressure ring 6, and the inner surface of the pressure ring 6 is provided with a groove 64 for the steel ball 8 to fall into or slide out. The diameter of the steel ball 8 is selected when it is placed When it is inside the groove 64, the steel ball 8 can protrude outside the inner surface of the pressure ring 6, and when it slides out of the groove 64, it can lean against the locking block 11, and the locking block 11 is on the surface of the steel ball. Under the action, it can move radially, and the groove 64 is provided with a slope for the steel ball to slide in or out. It is easy to understand that in other embodiments, the steel ball 8 can also be replaced by a cylindrical pin; the above-mentioned groove 64 can also be replaced by other structures such as an inclined surface and a stepped surface, as long as it can be realized in the radial direction perpendicular to the extension shaft 103. The difference in height is enough, and those skilled in the art can easily know that, in order to enhance the reliability of the slope, the above slope can be further configured into a shape with a self-locking function.

The upper end of the compression ring 6 is provided with a compression spring 4. Under the action of the compression spring 4, the compression ring 6 is biased toward the clamping portion 102 of the fastening element 10. The compression ring 6 is provided with a flange 61, which can be wound around The toggle end 72 of the shift fork 7 that rotates on the axis X can abut against the lower surface of the flange 61 so as to push the pressure ring 6 to overcome the force of the compression spring 4 and move away from the clamping part 102. The shift fork 7 passes through The shaft 73 is hinged on the casing 14, and a cam wrench 1 acts on the other end 71 of the shift fork 7. The operating handle of the cam wrench 1 is placed outside the casing 14 to easily operate the clamping device. The casing 14 is also provided with a limit pin 18 to prevent the excessive indexing of the cam wrench 1 . It is easy to understand that in other embodiments, the flange 61 can also be replaced by other structures, such as grooves, gears, etc., which can also realize the function of the pressure ring 6 moving in the direction of overcoming the force of the pressure spring 4 under the action of the shift fork 7 .

In this embodiment, the working mandrel 2, 2' is composed of the first shaft part 2 and the second shaft part 2', which facilitates the manufacture and assembly of the clamping device. In other embodiments, the working mandrel is also Can be composed directly from the same axis.

As shown in Figure 5, the spring 15 is axially put into the hole of the locking block 11, and with reference to Figure 2, the other end is against the inner end surface of the working mandrel 2, 2', and the axial height of the locking block 11 is slightly smaller than its The axial height of the installation space, so under the action of the force of the spring 15, the locking block 11 can have a small displacement in the axial direction. , the locking block 11 can float axially to make the teeth just mesh.

As shown in Fig. 6 and Fig. 7, the protrusion 22 used to limit the circumferential rotation of the working element 9 can also be arranged on the pressing end surface of the pressure ring 6. In this embodiment, the pressure ring 6 cannot rotate relative to each other through the flat position. The working element 9 can be clamped between the pressing end surface 62 of the pressing ring 6 and the clamping portion 102 of the fastener 10 so as to be sleeved outside the mandrel tube 21 of the working mandrel 2 , 2 ′.

Fig. 8 and Fig. 9 show another embodiment that can operate the pressure ring to move. When the large wrench 1' is pulled, the eccentric shaft 16 will rotate along with it, and the different convex surfaces 161 of the eccentric shaft 16 act on the pressure ring 6. To achieve the purpose of releasing and clamping the blade. When the blade is clamped, the convex surface 161 of the eccentric shaft 16 is separated from the pressure ring 6, and the pressure ring 6 is biased towards the blade under the force of the spring 4 . When the blade is released, the convex surface 161 of the eccentric shaft 16 moves up against the pressure ring 6, canceling the spring force applied to the blade, and the blade can be taken off.

In order to prevent that when the clamping block 11 of the holding assembly loosens the extension shaft 103, the fastening element 10 falls off in free fall from the working mandrel 2, 2', and the mandrel tube 21 of the working mandrel 2, 2' An anti-loosening element 17 is also provided on the inner side, and the anti-loosening element 17 may be a damping rubber ring or a shrapnel or the like.

The manner in which the power tool is operated to clamp or release the working element is described below according to the first preferred embodiment.

Fig. 1 is a schematic diagram of the clamping device in the clamping state. The short-diameter eccentric surface of the cam wrench 1 abuts against one end 71 of the shift fork 7, and the other end 72 of the shift fork 7 has no force on the pressure ring 6. The pressure ring 6 Under the force of the compression spring 4, it is biased towards the working element 9, and at the same time, the downward movement of the pressure ring 6 pushes the steel ball 8 to press against the locking block 11, so that the matching tooth part 111 of the locking block 11 and the shaft extend out The teeth portion 101 of 103 is engaged with each other, so that the extension shaft 103 is limited in the axial direction (Y direction), and then the working element 9 is clamped between the clamping portion 102 of the fastening element 10 and the pressure ring 6 .

Fig. 2 is a schematic diagram of the clamping device in the released state. The cam wrench 1 is pulled until the end 71 of the eccentric surface of its long diameter is pressed against the shift fork 7, and the other end 72 of the shift fork 7 is against the pressure ring 6. On the flange 61, thereby lifting the pressure ring 6, as the pressure ring 6 moves up, the force exerted on the working element 9 is canceled, and, as the pressure ring 6 moves up, the The groove 64 just moves to the position corresponding to the steel ball 8. At this time, when the fastening element 10 is pulled down, the two locking blocks 11 will be radially separated, so that the tooth portion of the fastening element 10 protrudes from the shaft 103 101 and the mating tooth portion 111 of the locking block 11 are disengaged, and at the same time, the two steel balls 8 also radially roll into the groove 64 of the pressure ring 6 to make room for the radial expansion of the locking block 11 . In this way, the fastening element 10 can be pulled out smoothly, and then the working element 9 can be removed.

Claims (17)

1. A power tool with a working element clamping device, comprising: a working spindle for driving said working element, a fastening element having a clamping portion and a protruding shaft insertable into the working mandrel, a holding component, having a first position for holding the extension shaft and a second position for disengaging the extension shaft, It is characterized in that it also includes a pressing element, and when the holding component is in the first position, the working element can be pressed between the pressing element and the clamping part. 2. The power tool with a working element clamping device according to claim 1, wherein the holding assembly is movable between the first position and the second position, and the moving direction thereof is substantially vertical on the extension shaft. 3. The power tool with the working element clamping device according to claim 2, further comprising a moving device for moving the holding assembly. 4. The power tool with the working element clamping device according to claim 3, characterized in that the moving device is partly arranged on the pressing element. 5. The power tool with a working element clamping device according to claim 4, characterized in that: the moving device further includes an intermediate piece that can abut against the holding assembly, and the pressing element is provided with A position and B position, there is a height difference between the A position and the B position in the radial direction perpendicular to the extension axis, and the intermediate piece can be selectively placed at the A position or the B position. 6 . The power tool with a working element clamping device according to claim 5 , wherein the intermediate member is a steel ball or a cylindrical pin. 7 . 7. The power tool with a working element clamping device according to claim 6, characterized in that: the radial height difference between the position A and the position B on the pressing element is configured as a stepped surface or a groove . 8. The power tool with a working element clamping device according to any one of claims 1 to 7, wherein a biasing element acts on the pressing element to bias it toward the clamping portion . 9. The power tool according to claim 8, wherein the biasing element comprises a first elastic element. 10. The power tool with a working element clamping device according to claim 9, further comprising an operating device for moving the pressing element in a direction against the force exerted by the first elastic element. 11. The power tool with working element clamping device according to claim 10, characterized in that: the operating device comprises a lever element that can rotate around an axis, one end of the lever element abuts against a cam wrench, and the other end Optionally abuts against an actuating portion provided on the pressing element. 12. The power tool with a working element clamping device according to claim 10, wherein the operating device comprises a rotating shaft and an operating element for rotating the rotating shaft around its axis, and the rotating shaft is provided with There is an eccentric convex surface which selectively abuts against an actuating portion provided on said pressing element. 13. The power tool with a working element clamping device according to claim 1, characterized in that: said holding assembly and said extension shaft are provided with matching shaped locking structures. 14 . The power tool with a clamping device for working components as claimed in claim 13 , wherein the form-locking structure comprises a tooth portion disposed on the protruding shaft and a mating tooth portion disposed on the holding component. 15 . 15. The power tool with a working element clamping device according to claim 14, further comprising a second elastic element acting on the holding assembly and exerting a force along the D direction, the D direction It is consistent with the direction in which the protruding shaft is inserted into the working mandrel. 16. The power tool with a working element clamping device according to claim 1, further comprising a protrusion for limiting the circumferential rotation of the working element, and the protrusion is arranged on the working core The drive end face of the shaft or is arranged on the pressure end face of the pressure element. 17. The power tool with a working component clamping device according to claim 1, characterized in that: the working mandrel is provided with an anti-loosening element for preventing the protruding shaft from falling off freely.

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