CN108274435B

CN108274435B - Power tool

Info

Publication number: CN108274435B
Application number: CN201810009541.9A
Authority: CN
Inventors: 付祥青; 陈亮
Original assignee: Nanjing Deshuo Industrial Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2017-01-06
Filing date: 2018-01-05
Publication date: 2020-12-01
Anticipated expiration: 2038-01-05
Also published as: CN108274435A; CN207888585U

Abstract

The invention discloses a power tool, especially a swing type power tool, comprising: the output shaft can be driven by the prime mover to swing by taking the central axis as an axis, and the mounting device is used for mounting the working accessory to the output shaft; the mounting device includes: a holding means movable between a first position for gripping the working attachment and a second position for releasing the working attachment, a driving means capable of generating an elastic force acting directly or indirectly on the holding means to move the holding means from the second position to the first position, and a locking means movable between a locking position for preventing movement of the holding means and an unlocking position for releasing the locking of the movement of the holding means; the locking means is further arranged to move from the locked position to the unlocked position when the gripping means is subjected to pressure exerted directly on it by the ground. Wherein the power tool enables a user to conveniently and quickly detach and install the working attachment.

Description

Power tool

Technical Field

The invention relates to a power tool, in particular to a swing type power tool.

Background

Power tools such as swing type tools usually require a work attachment to be mounted for sawing or the like, but the work attachment is various and easily damaged, and thus the attachment needs to be frequently replaced.

The swing-type power tool includes: the clamping device is used for clamping the working accessory on the output shaft to synchronously rotate or swing along with the output shaft. However, in the prior art, when the working accessory needs to be mounted on the clamping device, the working accessory often needs to be mounted by some auxiliary tools, which is not beneficial to the operation of a user.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a power tool capable of quickly disassembling a working accessory.

In order to achieve the above object, the present invention adopts the following technical solutions:

a power tool, comprising: the output shaft can be driven by the prime mover to swing by taking the central axis as an axis, and the mounting device is used for mounting the working accessory to the output shaft; the mounting device includes: a holding means movable between a first position for gripping the working attachment and a second position for releasing the working attachment, a driving means capable of generating an elastic force acting directly or indirectly on the holding means to move the holding means from the second position to the first position, and a locking means movable at least between a locking position for preventing movement of the holding means and an unlocking position for unlocking the movement of the holding means; wherein the locking means is further arranged to move from the locked position to the unlocked position when the gripping means is subjected to pressure exerted directly on it by the ground.

Further, the clamping device includes: a clamping piece with a first clamping surface; the output shaft forms or is connected with: and the mounting part is provided with a second clamping surface which is used for being matched with the first clamping surface to clamp the working accessory.

Further, the holder includes: a force receiving portion for receiving a pressure applied thereto from the ground; wherein, when the working attachment is coupled to the clamping device, a coupling point of the working attachment to the clamping device is located between the force receiving portion and the second clamping face in a direction parallel to the central axis.

Further, the holder includes: a force receiving portion for receiving a pressure applied thereto from the ground; wherein, when the work attachment is coupled to the clamping device, the force receiving portion and the first clamping face are located on the same side of a coupling position where the work attachment is coupled to the clamping device in a direction parallel to the central axis.

Further, the clamping piece is connected with the output shaft in a rotating mode, and the axis of the clamping piece rotating relative to the output shaft is perpendicular to the central axis.

Further, the clamping device includes: a clamping piece with a first clamping surface; the output shaft forms or is connected with: the mounting part is used for being matched with the clamping piece to clamp the working accessory; wherein the mounting portion has at least one lowest point farthest from the prime mover in a direction parallel to the central axis; the clamping member projects at a lowest point relative to the prime mover in a direction parallel to the central axis and away from the prime mover.

Further, the clamping device includes: a clamping piece with a first clamping surface; the output shaft forms or is connected with: the mounting part is used for being matched with the clamping piece to clamp the working accessory; wherein the working attachment has at least one lowest point farthest from the prime mover in a direction parallel to the central axis when the working attachment is coupled between the clamp and the mounting portion; when the work attachment is coupled between the clamp and the mounting portion and the clamp device is in the second position, the clamp projects relative to the lowest point in a direction parallel to the central axis and away from the prime mover.

An oscillating type power tool comprising: the power tool comprises a shell, a prime motor, an output shaft and a mounting device, wherein the prime motor is arranged in the shell, the output shaft can be driven by the prime motor to swing by taking a central axis as an axis, and the mounting device is used for mounting a working accessory to the output shaft; the mounting device includes: the clamping part and the output shaft form a rotary connection capable of moving between a first position for clamping the working accessory and a second position for releasing the working accessory, the locking part can move at least to a locking position for locking the rotation of the clamping part relative to the output shaft, and the elastic part generates an elastic force capable of enabling the clamping part to move from the second position to the first position; wherein when the clamp is in the second position and the working attachment is coupled between the clamp and the output shaft, the clamp is contactable by the ground and triggers the locking member to move out of the locking position when the ground applies pressure thereto.

Further, the holder is formed with a guide hole, and the locking member is slidable along the guide hole and moves the holder between the first position and the second position when slid.

Further, one end of the guide hole is formed with: a locking portion that locks movement of the clamping member when the locking member moves to the locking portion.

The invention has the advantages that: the power tool enables a user to quickly detach the working accessory without using an auxiliary tool.

Drawings

Fig. 1 is a perspective view of a power tool as an embodiment;

FIG. 2 is a cross-sectional view of the power tool of FIG. 1;

FIG. 3 is a plan view of the mounting device and output shaft of FIG. 1;

FIG. 4 is a cross-sectional view of the mounting device and output shaft of FIG. 1, with the clamping device in a second position and the operating member not being operated by a user;

FIG. 5 is a cross-sectional view of the mounting device and output shaft of FIG. 1, with the clamping device in a first position and the operating member not being operated by a user;

FIG. 6 is a cross-sectional view of the mounting device and output shaft of FIG. 1, with the clamping device in a second position and the operating member operated by a user;

FIG. 7 is an exploded view of the mounting device and output shaft of FIG. 1;

FIG. 8 is a cross-sectional view of the mounting device and output shaft of the second embodiment showing the first and second clamping members open;

FIG. 9 is a cross-sectional view of the mounting device and output shaft of the second embodiment with the first and second clamping members closed;

FIG. 10 is an exploded view of the mounting device and output shaft of FIG. 8;

FIG. 11 is a cross-sectional view of the mounting device and output shaft of the third embodiment, showing the first and second clamping members closed;

FIG. 12 is a cross-sectional view of the mounting device and output shaft of the third embodiment showing the first and second clamping members open;

FIG. 13 is an exploded view of the mounting device and output shaft of FIG. 11;

fig. 14 is an enlarged view of the first and second clamping members of fig. 11.

Detailed Description

The power tool 100 shown in fig. 1 is capable of driving a working attachment 200 in swing motion, and may be embodied as a swing-type power tool. As shown in fig. 1 and 2, the power tool 100 may include: a housing 11, a prime mover 12, an output shaft 13, and a mounting device 20. For an oscillating type power tool, the power tool 100 further comprises a transmission 14 for converting the rotation of the prime mover 12 into an oscillation of the output shaft 13.

The housing 11 is formed with a receiving cavity 111 therein, the prime mover 12 and the transmission 14 are disposed in the receiving cavity 111 of the housing 11, and the output shaft 13 and the mounting device 20 are at least partially disposed in the receiving cavity 111. The portion of the housing 11 surrounding the receiving cavity 111 may also serve as a handle for a user to hold. The prime mover 12 is used to drive the output shaft 13 to swing around the central axis 101, and in this embodiment, the prime mover 12 may be specifically an electric motor. A transmission 14 is provided between the prime mover 12 and the output shaft 13 for converting the rotation output by the prime mover 12 into a swinging motion of the output shaft 13. Specifically, the transmission 14 includes a swing link 141, and the swing link 141 can be driven by the prime mover 12 to swing, so that the swing link 141 drives the output shaft 13 to swing around the central axis 101. The mounting device 20 is used to mount the working attachment 200 to the power tool 100, and further, the mounting device 20 is connected to the output shaft 13. Thus, the mounting device 20, the working attachment 200 and the output shaft 13 can form a whole body which can swing along with the output shaft 13 by taking the central axis 101 as an axis, and the swinging working attachment 200 can perform operations such as sawing on a workpiece. For an oscillating type power tool, the working attachment 200 may be a circular saw blade, a straight saw blade, etc., and in the present embodiment, a straight saw blade is taken as an example.

As shown in fig. 2 and 7, for an oscillating type power tool, the working attachment 200 generally includes: a coupling portion 201, a working portion 202, and a connecting portion 203. Wherein, the combining part 201 is formed with a combining hole 201a for matching with the mounting device 20, the working part 202 is connected to the combining part 201 through the connecting part 203, and one end of the working part 202 far away from the combining part 201 can be further formed with a saw tooth 202a for cutting a workpiece. In addition, there is usually a height difference of L between the coupling portion 201 and the working portion 202, and the height of the connecting portion 203 in the direction along the central axis 101 is substantially L.

As shown in fig. 2 to 7, the mounting device 20 includes: a clamping device 21, a driving device 22 and a locking device 23.

The clamp 21 is movable between a first position, in which the clamp 21 clamps the work attachment 200 to the power tool 100, and a second position, in which the clamp 21 releases the work attachment 200, in which the work attachment 200 can be removed from the power tool 100. The drive means 22 can generate a spring force acting directly or indirectly on the holding means 21, which spring force can cause the holding means 21 to have a tendency to move from the second position to the first position. The locking device 23 is movable between a locked position and an unlocked position, the locking device 23 being capable of preventing movement of the clamp device 21 when the locking device 23 is in the locked position, and the locking device 23 being unlocked from locking the movement of the clamp device 21 when the locking device 23 is in the unlocked position.

Wherein the locking means 23 is further arranged to move the locking means 23 from the locked position to the unlocked position when the clamping means 21 is subjected to pressure exerted directly on it by the ground. Thus, when the user needs to mount the working attachment 200, the user can first couple the working attachment 200 to the power tool 100 in a direction parallel to the central axis 101, at which time the coupling portion 201 of the working attachment 200 is located between the holding device 21 and the output shaft 13, and then, the user operates the power tool 100 again to press toward the ground when the holding device 21 is in contact with the ground, at which time the holding device 21 receives an acting force of the ground, the acting force causing the locking device 23 to move from the locking position to the unlocking position where the locking of the movement of the holding device 21 is released, and then, the holding device 21 moves from the second position to the first position by the elastic force generated by the driving device 22, and the holding device 21 clamps the working attachment 200.

Specifically, as shown in fig. 3 to 7, the clamping device 21 includes a clamping member 24, and the clamping member 24 includes: a rotating portion 241, a clamping portion 242, and a locking portion 243. The rotating portion 241 is for rotatably mounting the holder 24 to the output shaft 13, the holding portion 242 is formed with a first holding surface 242a for contacting the work attachment 200 to hold the work attachment 200, the first holding surface 242a can stop the work attachment 200 from coming off the output shaft 13 in a direction parallel to the central axis 101, and the locking portion 243 is for cooperating with the locking device 23 to lock the rotation of the holder 24. Wherein the axis of rotation of the clamping member 24 relative to the output shaft 13 is also perpendicular to the central axis 101. The output shaft 13 is also formed with or connected to a mounting portion 131, and the mounting portion 131 is formed with a second clamping surface 131a for cooperating with the first clamping surface 242a to clamp the working attachment 200.

More specifically, the clamping portion 242 and the locking portion 243 are respectively disposed at both sides of the rotating portion 241, the locking portion 243 is further formed with a guide hole 243a, the locking device 23 includes a locking member 231 at least partially located in the guide hole 243a and slidable in the guide hole 243a, and further, the locking member 231 is a locking rod. The hole wall of the guide hole 243a is formed with a guide surface 243b, and the guide surface 243b is used for cooperating with the locking member 231 and guiding the holder 24 to move from the second position to the first position when the locking rod slides along the guide surface 243 b. The guide hole 243a is also formed at one end with a locking portion 243c, and when the locking bar moves to the locking portion 243c, the locking bar locks the rotation of the clamp 24.

The output shaft 13 and the mounting portion 131 as a whole have a lowest point 131b farthest from the prime mover 12 in a direction parallel to the central axis 101. The clamp 24 projects relative to the lowest point 131b in a direction parallel to the central axis 101 and toward away from the prime mover 12. That is, the clamp 24 is at least partially located on a side of a plane 102 perpendicular to the central axis 101 and passing through the lowest point 131b, away from the prime mover 12.

Further, when the work attachment 200 is coupled to the mounting portion 131 and the clamp 24 is located at the second position, the work attachment 200 has a lowest point 202b farthest from the prime mover 12 in a direction parallel to the central axis 101, and the clamp 24 protrudes from the lowest point 202b in a direction parallel to the central axis 101 and toward away from the prime mover 12. That is, the clamp 24 is at least partially located on a side of a plane 103 perpendicular to the central axis 101 and passing through the lowest point 202b, away from the prime mover 12. Specifically, with the working attachment 200 adapted to the swing-type power tool in the present embodiment, the clamp 24 projects relative to the working portion 202 and the connecting portion 203 of the working attachment 200 in a direction parallel to the central axis 101 and toward away from the prime mover 12. That is, the distance between the point at which the holder 24 is farthest from the mounting portion 131 and the mounting portion 131 in the direction parallel to the central axis 101 is greater than L. Thus, when the working attachment 200 is coupled to the mounting portion 131 and the holder 24 is located at the second position, the user can operate the power tool 100 such that the holder 24 is in contact with and pressed toward the ground, the table, the wall, or the like, which applies a force to the holder 24, thereby disengaging the locking member 231 from the engagement with the locking portion 243c, such that the rotation of the holder 24 is released, and the holder 24 is moved from the second position to the first position by the driving means 22.

Specifically, the clamping member 24 further includes a force receiving portion 244 at an end near the clamping portion 242 for receiving a force applied thereto by a floor, a table, a wall, or the like. When the work attachment 200 is coupled to the clamp device 21, the coupling portion 201, in which the work attachment 200 is coupled to the mounting portion 131, is located between the force receiving portion 244 and the second clamp surface 131a in a direction parallel to the central axis 101; meanwhile, the force receiving portion 244 and the first clamping surface 242a are also located on the same side of the coupling portion 201 in a direction parallel to the central axis 101.

In fact, the clamping portion 24 is not limited to receiving the force applied to the ground, the table, the wall, etc., and the user can press the force receiving portion 244 with a hand or hit the force receiving portion 244 with other auxiliary tools, and the locking member 231 can be disengaged from the locking portion 243c to release the rotation of the clamping member 24.

In the present embodiment, the driving device 22 includes: a pull rod 221 connected to the locking lever, a resilient member 222 biasing the pull rod 221 to generate an indirect resilient force on the clamp 24, the resilient force being capable of causing the clamp 24 to have a tendency to move from the second position to the first position. Further, the power tool 100 further includes an operating member 25 for user operation and a transmission member 26 capable of driving the movement of the pull rod 221.

The output shaft 13 is formed with an accommodating space 132 around the central axis 101, the draw bar 221 is disposed in the accommodating space 132, and the draw bar 221 is also in sliding connection with the output shaft 13 along the direction of the central axis 101. One end of the pull rod 221 is connected to the locking rod, and the other end can contact with the driving member 26. The resilient member 222 biases the tension rod 221 such that the tension rod 221 has a tendency to move in a direction along the central axis 101 toward a direction away from the clamp 24. Specifically, the elastic member 222 is a coil spring that is disposed in the accommodating space 132 and biases the pull rod 221. The operating element 25 is intended to be operated by a user, and the operating element 25 can be connected to the housing 11 in a rotatable manner. The transmission member 26 is connected to the operating member 25 and is rotatable together with the operating member 25 when the operating member 25 is rotated. The transmission member 26 is formed with a driving slope 261, and the tension rod 221 is provided with a projection 221a contacting the driving slope 261. Thus, when the user rotates the operating member 25, the transmission member 26 can move the pull rod 221 against the bias of the elastic member 222 toward the direction approaching the clamping member 24, so that the locking rod slides in the guide hole 243a and drives the clamping member 24 to move from the first position to the second position.

Fig. 8 to 10 show the structures of the working attachment 300 and the mounting device 30 of the power tool of the second embodiment, which may have the same housing, prime mover, output shaft, and working attachment 300 as the power tool 100 of the first embodiment. In this embodiment, the mounting device 30 includes a clamping device 31, and the mounting device 30 further includes a driving device 32 and a locking device 33 which are the same as those in the first embodiment, except for the difference of the clamping device 31, and only the differences between the first embodiment and the second embodiment will be described below. The structures in the first embodiment that are suitable for this embodiment can be applied to this embodiment, and details are not repeated.

The clamping device 31 comprises a first clamping piece 34 and a second clamping piece 35, the first clamping piece 34 and the second clamping piece 35 can be opened or closed at the same time, when the first clamping piece 34 and the second clamping piece 35 are in an opened state, the first clamping piece 34 and the second clamping piece 35 can clamp the working accessory 300 to the power tool at the same time, so that the working accessory 300 is clamped to the power tool more stably; when the first and second clamping members 34, 35 are in the closed state, the clamping device 31 releases the working attachment 300, and the working attachment 300 can be detached from the power tool. The elastic member 322 of the driving device 32 can generate an elastic force directly or indirectly acting on the holding device 31, and the elastic force can make the holding device 31 have a tendency to move from the closed state to the open state. The locking device 33 is movable between a locked position and an unlocked position, the locking device 33 being capable of preventing movement of the gripping device 31 when the locking device 33 is in the locked position, and the locking device 33 being unlocked from movement of the gripping device 31 when the locking device 33 is in the unlocked position. Further, the power tool includes an operating member 36 for user operation and a transmission member 37 for driving the movement of the lever 321.

Specifically, as shown in fig. 8 to 10, the first clamp 34 includes: the first rotating portion 341, the first clamping portion 342, and the first locking portion 343, and the second clamping member 35 includes: a second rotating portion 351, a second clamping portion and a second locking portion 353, the first rotating portion 341 of the first clamping member 34 and the second rotating portion 351 of the second clamping member 35 are used for rotatably mounting the first clamping member 34 and the second clamping member 35 to the output shaft, the rotating axes of the first rotating portion 341 and the second rotating portion 351 are perpendicular to the central axis 201 and are overlapped with each other and intersect with the central axis 201, when the first clamping member 34 rotates around the first rotating portion 341 in a first rotating direction, the first clamping portion 342 is far away from the central axis 201, and simultaneously the second clamping member 35 rotates around the second rotating portion 351 in a second rotating direction, and the second clamping portion 352 is far away from the central axis 201, so that the first clamping member 34 and the second clamping member 35 are simultaneously opened, and thus the clamping device 31 clamps the work attachment 300; when the first clamping member 34 rotates around the first rotating portion 341 in the second rotating direction, the first clamping portion 342 approaches the central axis 201, and simultaneously the second clamping member 35 rotates around the second rotating portion 351 in the first rotating direction, and the second clamping portion approaches the central axis 201, so that the first clamping member 34 and the second clamping member 35 are simultaneously closed, and the clamping device 31 reaches the unlocking position. The first and second clamps 34, 35 are freely rotatable between 0-90 degrees, and more preferably between 20-50 degrees, which is preset to 25 degrees in this embodiment. The holding portion of the first holding member 34 is formed with a first holding face 342a for contacting the work attachment 300 to hold the work attachment 300, the first holding face 342a being capable of stopping the work attachment 300 from coming off the output shaft in a direction parallel to the center axis 201; the holding portion of the second holding member 35 is formed with a second holding surface 352a for contacting the work attachment 300 to hold the work attachment 300, the second holding surface 352a can stop the work attachment 300 from being detached from the output shaft in a direction parallel to the center axis 201, and the first holding surface 342a and the second holding surface 352a simultaneously act on the work attachment 300, achieving more stable holding of the work attachment 300 to the power tool. The output shaft also forms or is connected with a mounting portion 231, the mounting portion 231 forming a third clamping surface 231a for cooperating with the first and

second clamping surfaces

342a, 352a to clamp the work attachment 300.

The locking device 33 moves from the locked position to the unlocked position when the first clamp 34 is subjected to pressure directly applied to it by the ground. Thus, when the user desires to mount the working attachment 300, the working attachment 300 may be coupled to the power tool in a direction parallel to the central axis 201, at which time, the coupling portion 301 of the working attachment 300 is located between the holding device 31 and the output shaft, and the force receiving portion of the first clamping member 34 projects downward from the work attachment 300 in the direction along the center axis 201, then, the user operates the power tool again to press the first clamping member 34 toward the ground when the first clamping member is in contact with the ground, and the force-receiving portion of the first clamping member 34 receives the force from the ground, this force causes the locking device 33 to move from the locked position to the unlocked position, which unlocks the movement of the clamping device 31, and, subsequently, the first and second clamping members 34 and 35 are moved from the closed state to the open state by the elastic force generated by the driving device 32, and the clamping device 31 clamps the work attachment 300.

Specifically, when the first and second clamps 34 and 35 are in a relatively closed state, the dimension of the second clamp 35 in the direction along the center axis 201 is smaller than that of the first clamp 34.

Specifically, with respect to the working attachment 300 adapted to the swing type power tool in the present embodiment, the first clamp member 34 has the same structure as the first embodiment in the direction parallel to the center axis 201 and toward the direction away from the prime mover, the second clamp member 35 has a smaller dimension in the direction along the center axis 201 than the first clamp member 34 when the first clamp member 34 and the second clamp member 35 are in the relatively closed state, and the second clamp member 35 projects relative to the joint portion 301 of the working attachment 300 but is defined within the connecting portion 303 in the direction parallel to the center axis 201 and toward the direction away from the prime mover. That is, the distance between the point at which the second clamping member 35 is farthest from the mounting portion 231 and the mounting portion 231 is less than L in a direction parallel to the central axis 201, thereby avoiding an obstruction to the user's operation of the power tool such that the ground, table or wall surface applies pressure to the first clamping member 34. As shown in fig. 9, when the working attachment 300 is coupled to the power tool in the direction of the central axis 201 and the first clamping member 34 and the second clamping member 35 are in the relatively closed state, the first clamping member 34 protrudes from the working attachment 300 in the direction of the central axis 201, and the second clamping member 35 does not protrude from the working attachment 300 in the direction of the central axis 201, so that the user can move the locking device 33 from the locking position to the unlocking position only by activating the first clamping member 34, thereby improving the reliability of the operation. Further, in the present embodiment, the first clamping member 34 has a first guide hole 343a through which the locking member 331 in the locking device 33 passes, and the second clamping member 35 also has a second guide hole 353a through which the locking member 331 in the locking device 33 passes, and the second clamping member 35 is driven to rotate by the sliding of the locking member 331 along the hole wall of the second guide hole 353 a. Among them, in the present embodiment, the work attachment 300 can be more stably clamped to the power tool by the provision of the second clamp 35.

Fig. 11 to 13 show the structures of the working attachment 400 and the mounting device 40 of the power tool of the third embodiment, which may have the same housing, prime mover, output shaft, and working attachment 400 as the power tool 100 of the first embodiment. In the present embodiment, the mounting device 40 includes the clamping device 41, and the mounting device 40 further includes the same driving device 42 as that in the first embodiment, except for the difference of the clamping device 41, and only the difference between the present embodiment and the first embodiment will be described below. The structures in the first embodiment that are suitable for this embodiment can be applied to this embodiment, and details are not repeated.

The clamping device 41 comprises a first clamping piece 44 and a second clamping piece 45, the first clamping piece 44 and the second clamping piece 45 can be opened or closed at the same time, when the first clamping piece 44 and the second clamping piece 45 are in an opened state, namely when the second clamping piece 45 is far away from the first clamping piece 44, the first clamping piece 44 and the second clamping piece 45 can clamp the working accessory 400 to the power tool at the same time, so that the working accessory 400 and the power tool are clamped more tightly; when the first and

second clamping members

44, 45 are in the closed state, i.e., the second clamping member 45 is close to the first clamping member 44, the clamping device 41 releases the work attachment 400, and the work attachment 400 can be detached from the power tool. The driving means 42 can generate a spring force acting directly or indirectly on the holding means 41, which spring force can cause the holding means 41 to have a tendency to move from the closed state to the open state. Further, the power tool further comprises an operating member 46 for user operation, a transmission member 47 capable of driving the connecting assembly 421 to move, and a mounting member 43 for mounting the first clamping member 44 and the second clamping member 45.

As shown in fig. 11 to 13, the first clamp 44 includes: the first rotating portion 441, the first clamping portion 442, and the first guide hole 443, the second clamping member 45 includes: the second rotating portion 451, the second clamping portion, and the second guide hole 453, and more specifically, the first guide hole 443 is a first waist-shaped hole 443a, and the second guide hole 453 is a second waist-shaped hole 453 a. The first waist-shaped hole 443a includes a first plane 443b and a second plane 443c parallel to each other, the first plane 443b and the second plane 443c have one end connected to the first circular arc surface 443d of the first plane and the other end connected to the second circular arc surface 443e of the second plane; the second waist-shaped hole 453a includes a third plane 453b and a fourth plane 453c parallel to each other, and the third plane 453b and the fourth plane 453c have one end connected to a third arc 453d thereof and the other end connected to a fourth arc 453e therebetween. The first rotating portion 441 of the first clamping member 44 and the second rotating portion 451 of the second clamping member 45 are used for rotatably mounting the first clamping member 44 and the second clamping member 45 to the output shaft through the rotating shaft pin 48, the rotating axes of the first rotating portion 441 and the second rotating portion 451 are perpendicular to the central axis 301 line, coincide with each other and intersect with the central axis 301, and the first guide hole 443 and the first clamping portion 442 are respectively positioned at two sides of the rotating shaft pin 48 along the central axis 301 direction; the second guide hole 453 and the second clamping portion are respectively located at both sides of the shaft pin 48. The driving means 42 includes a driving member 49, the driving member 49 is a guide pin sequentially passing through the first guide hole 443 and the second guide hole 453, and the driving member 49 is capable of moving between the first position and the second position without being influenced by the first plane 443b and the second plane 443c of the first kidney-shaped hole 443a and without being influenced by the third plane 453b and the fourth plane 453c of the second kidney-shaped hole 453 a. When the driving member 49 is moved to the first position, the first and

second clamping members

44, 45 are driven away from each other; that is, the first clamping member 44 rotates around the first rotating portion 441 in the first rotating direction, the first clamping portion 442 is far away from the central axis 301, and simultaneously the second clamping member 45 rotates around the second rotating portion 451 in the second rotating direction, the second clamping portion is far away from the central axis 301, so that the first clamping member 44 and the second clamping member 45 are simultaneously opened, and the clamping device 41 clamps the working accessory 400; when the driving member 49 moves to the second position, the first clamping member 44 and the second clamping member 45 are driven to approach each other, that is, the first clamping member 44 rotates around the first rotating portion 441 in the second rotating direction, the first clamping portion 442 approaches the central axis 301, and the second clamping member 45 rotates around the second rotating portion 451 in the first rotating direction, and the second clamping portion approaches the central axis 301, so that the first clamping member 44 and the second clamping member 45 are simultaneously closed, and the clamping device 41 releases the working accessory 400. The first and

second clamping members

44 and 45 are freely rotatable between 0 degrees and 90 degrees, preferably between 20 degrees and 50 degrees, and the present embodiment is preset to 25 degrees. The holding portion of the first holding piece 44 is formed with a first holding surface 442a for contacting the work attachment 400 to hold the work attachment 400, the first holding surface 442a being capable of stopping the work attachment 400 from coming off the output shaft in a direction parallel to the center axis 301; the clamping portion of the second clamping member 45 is formed with a second clamping surface 452a for contacting the work attachment 400 to clamp the work attachment 400, the second clamping surface 452a can stop the work attachment 400 from disengaging from the output shaft in a direction parallel to the central axis 301, and the first clamping surface 442a and the second clamping surface 452a simultaneously act on the work attachment 400 to achieve a tighter clamping between the work attachment 400 and the power tool. The output shaft also forms or is connected with a mounting portion 331, the mounting portion 331 forming a third clamping surface 331a for cooperating with the first and

second clamping surfaces

442a, 452a to clamp the work attachment 400.

When the user rotates the operating member 46 to the triggering position, the driving member 47 presses the connecting assembly 421 to move the driving member 49 in the first guiding hole 443 and the second guiding hole 453, and at this time, the elastic element 422 drives the first clamping member 44 and the second clamping member 45 to move from the open state to the closed state, and the driving member 49 moves from the first position to the second position. Specifically, the output shaft is formed with a housing space 332 around the central axis 301, a connecting assembly 421 is disposed in the housing space 332, and the connecting assembly 421 also forms a sliding connection with the output shaft in the direction of the central axis 301. The connecting member 421 has one end connected to the driving member 49 and the other end capable of contacting the driving member 47. The resilient member 422 biases the connecting assembly 421 such that the connecting assembly 421 has a tendency to move in a direction along the central axis 301 toward a direction away from the first and

second clips

44, 45. Specifically, the elastic member 422 is a coil spring that is disposed in the receiving space 332 and biases the connection assembly 421. The operating element 46 is intended to be operated by a user, and the operating element 46 can in particular be connected to the housing in a rotatable manner. The transmission member 47 is connected to the operating member 46 and is rotatable together with the operating member 46 when the operating member 46 is rotated. The driving member 47 is formed with a driving slope 471, and the coupling assembly 421 is provided with a protrusion contacting the driving slope 471. Thus, when the user rotates the operating member 46 to the trigger position, the transmission member 47 can move the connecting assembly 421 against the bias of the elastic member 422 toward the direction close to the first clamping member 44 and the second clamping member 45, so that the driving member 49 slides in the guide hole and drives the second clamping member 44 and the first clamping member 45 to move from the open state to the closed state; when the user rotates the operating member 46 to the initial position, the elastic member 422 can pull the driving member 49 to move away from the clamping member, so that the driving member 49 slides in the guiding hole and drives the second clamping member 44 and the first clamping member 45 to move from the closed state to the open state, and the clamping device 41 clamps the working accessory 400.

Specifically, for the working attachment 400 adapted to the swing-type power tool in the present embodiment, the first and

second clamping members

44 and 45 project relative to the joint portion 401 of the working attachment 400 but are defined within the connecting portion 403 in a direction parallel to the center axis 301 and toward away from the prime mover. That is, the distance between the point of the second clamping member 45 farthest from the mounting portion 331 and the mounting portion 331 in a direction parallel to the central axis 301 is less than L, thereby achieving that the clamping portion can lock the working attachment 400. When the working attachment 400 is coupled to the power tool with the driver 49 in the first position, the first clamping portion 442 has a first lowest point 442b which is furthest from the driver 49 in the direction along the central axis 301, the second clamping portion has a second lowest point 452b which is furthest from the driver 49 in the direction along the central axis 301, the working attachment 400 is distributed on both sides of a plane passing through the first lowest point 442b and perpendicular to said central axis 301, and the working attachment 400 is also distributed on both sides of a plane passing through the second lowest point 452b and perpendicular to the central axis 301.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A power tool, comprising:

a prime mover;

an output shaft that is driven by the prime mover to swing about a central axis;

mounting means for mounting a working attachment to the output shaft;

the mounting device includes:

a clamping device movable between a first position clamping the work attachment and a second position releasing the work attachment;

drive means capable of generating a spring force acting directly or indirectly on said holding means to move said holding means from said second position to said first position;

a locking device movable at least between a locked position preventing movement of the gripping device and an unlocked position unlocking movement of the gripping device;

wherein the locking means is further arranged to move from the locked position to the unlocked position when the gripping means is subjected to pressure exerted directly on it by the ground.

2. The power tool of claim 1, wherein:

the clamping device includes:

a clamping piece, which is provided with a first clamping surface;

the output shaft forms or is connected with:

and the mounting part is provided with a second clamping surface which is used for being matched with the first clamping surface to clamp the working accessory.

3. The power tool of claim 2, wherein:

the holder includes:

a force receiving portion for receiving a pressure applied thereto from the ground;

wherein, when the working attachment is coupled to the clamping device, a coupling point at which the working attachment is coupled to the clamping device is located between the force receiving portion and the second clamping surface in a direction parallel to the central axis.

4. The power tool of claim 2, wherein:

the holder includes:

wherein, when the working attachment is coupled to the clamping device, the force receiving portion and the first clamping face are located on the same side of a coupling place where the working attachment is coupled to the clamping device in a direction parallel to the central axis.

5. The power tool of claim 2, wherein:

the clamping piece and the output shaft form a rotary connection, and the axis of the clamping piece rotating relative to the output shaft is perpendicular to the central axis.

6. The power tool of claim 1, wherein:

the clamping device includes:

a clamping piece, which is provided with a first clamping surface;

the output shaft forms or is connected with:

the mounting part is used for being matched with the clamping piece to clamp the working accessory;

wherein the mounting portion has at least one lowest point furthest from the prime mover in a direction parallel to the central axis;

the clip projects relative to the nadir in a direction parallel to the central axis and toward away from the prime mover.

7. The power tool of claim 1, wherein:

the clamping device includes:

a clamping piece, which is provided with a first clamping surface;

the output shaft forms or is connected with:

wherein the working attachment has at least one lowest point furthest from the prime mover in a direction parallel to the central axis when the working attachment is coupled between the clamp and the mounting portion;

when the work attachment is coupled between the clamp and the mounting portion and the clamp device is in the second position, the clamp projects out of the lowest point in a direction parallel to the central axis and away from the prime mover.

8. An oscillating type power tool comprising:

a housing;

a prime mover disposed within the housing;

mounting means for mounting a working attachment to the output shaft;

the mounting device includes:

a clamping member, which forms a rotary connection with the output shaft and can move between a first position for clamping the working accessory and a second position for releasing the working accessory;

a locking member movable at least to a locking position for locking rotation of the clamp member relative to the output shaft;

an elastic member for generating an elastic force capable of moving the holding member from the second position to the first position;

wherein when the clamp is in the second position and the work attachment is coupled between the clamp and the output shaft, the clamp is contactable by the ground and triggers the locking member to move out of the locking position when the ground applies pressure thereto.

9. The oscillating type power tool according to claim 8, wherein:

the clamping member is formed with a guide hole along which the locking member can slide and move the clamping member between the first position and the second position when sliding.

10. The oscillating type power tool according to claim 9, wherein:

one end of the guide hole is formed with:

a locking part locking the movement of the clamping member when the locking member moves to the locking part.