CN109590545B

CN109590545B - Clamping device for clamping working accessory and electric tool

Info

Publication number: CN109590545B
Application number: CN201710919576.1A
Authority: CN
Inventors: 魏淦; 周洋
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2021-05-11
Anticipated expiration: 2037-09-30
Also published as: CN109590545A

Abstract

The invention discloses a clamping device for clamping a working accessory and an electric tool, wherein the clamping device comprises: the device comprises a device body, a locking system and an operating piece; the device body is formed with a chamber for accommodating at least part of the working accessory, the locking system has at least a locking state for locking the working accessory to the device body and a releasing state for releasing the working accessory to allow the working accessory to be disengaged from the device body, and the operating member drives the locking system to be switched from the locking state to the releasing state when being operated by a user; wherein the working attachment is itself capable of applying a trigger force to the locking system upon insertion of the working attachment into the chamber to actuate the locking system from the released state to the locked state. The clamping device enables a user to conveniently and quickly mount the working accessory to the electric tool.

Description

Clamping device for clamping working accessory and electric tool

Technical Field

The invention relates to an electric tool, in particular to a clamping device of the electric tool.

Background

Power tools such as jig saws typically require a saw blade to be mounted for cutting operations on a workpiece, and therefore jig saws need to be provided with a clamping device for clamping the saw blade. However, the existing clamping device has a complex structure, and a user needs to operate with both hands or two steps to disassemble and assemble the saw blade.

Disclosure of Invention

To overcome the defects in the prior art, the invention aims to provide a clamping device for clamping a working accessory, which is convenient for a user to operate, and an electric tool.

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

a clamping device for clamping a work attachment, comprising: the device comprises a device body, a locking system and an operating piece; the device body is formed with a chamber for accommodating at least part of the working accessory, the locking system has at least a locking state for locking the working accessory to the device body and a releasing state for releasing the working accessory to allow the working accessory to be disengaged from the device body, and the operating member drives the locking system to be switched from the locking state to the releasing state when being operated by a user; wherein the working attachment is itself capable of applying a trigger force to the locking system upon insertion of the working attachment into the chamber to actuate the locking system from the released state to the locked state.

Further, the locking system comprises: a drive member which applies a driving force to the working attachment which tends to cause the working attachment to be ejected when the locking system is switched from the locked state to the released state.

Further, the locking system comprises: and the driving piece ejects the working accessory when the locking system is switched from the locking state to the releasing state.

Further, the locking system comprises: a locking member that locks the working attachment when in contact with the working attachment, and a hole that includes a first hole wall portion for receiving the locking member; when the locking system is in the locked state, the locking member is in the first position in simultaneous contact with the working attachment and the first aperture wall portion.

Further, the aperture further comprises a second aperture wall portion for receiving the locking element; the locking member is in a second position in contact with the second aperture wall portion when the locking system is in the released state; the second aperture wall portion is recessed relative to the first aperture wall portion.

Further, the hole further comprises a connecting portion for connecting the first hole wall portion and the second hole wall portion such that both of them form a step at the connection.

Further, the locking system comprises: a driving member including a first driving portion for applying a driving force for ejecting the working attachment to the working attachment when the locking system is switched from the locked state to the released state; the driving member further includes: a second drive portion that drives the locking member from the second position to the first position when the working accessory applies the trigger force to the locking system.

Furthermore, the driving piece and the device body form a rotary connection by taking the first axis as a shaft; the first and second drive portions are located on either side of a plane passing through the first axis.

Further, the locking system further comprises: a biasing element; the biasing element generates a biasing force that biases the locking member from the second position toward the first position.

A power tool, comprising: the motor is arranged in the shell, and the output piece is driven by the motor to output power; the electric tool also comprises the clamping device for clamping the working accessory; the clamping device is connected to the output.

The invention has the advantages that: the user can convenient and fast accomplish the dismouting of work annex.

Drawings

FIG. 1 is a plan view of the jigsaw of the present invention;

FIG. 2 is a plan view of the clamping device of FIG. 1 with the saw blade locked to the device body;

FIG. 3 is a right side view of the structure shown in FIG. 2;

FIG. 4 is a cross-sectional view of the structure of FIG. 3 taken along line A-A;

FIG. 5 is an exploded view of the structure shown in FIG. 2;

FIG. 6 is a plan view of the structure shown in FIG. 5;

FIG. 7 is a plan view of the clamping device of FIG. 1 with the saw blade not inserted into the device body;

FIG. 8 is a right side view of the structure shown in FIG. 7;

FIG. 9 is a cross-sectional view of the structure of FIG. 8 taken along line B-B;

FIG. 10 is a right side view of the clamping device of FIG. 1 with the saw blade inserted into the device body and not yet in contact with the drive member;

FIG. 11 is a cross-sectional view of the structure of FIG. 10 taken along line C-C;

FIG. 12 is a right side view of the clamping device of FIG. 1 with a saw blade inserted into the device body and in contact with the drive member;

fig. 13 is a cross-sectional view of the structure of fig. 12 taken along line D-D.

Detailed Description

The power tool shown in fig. 1 achieves its tool function by connecting a working attachment, and further includes an output member for outputting power and a holding device 20 for connecting the working attachment to the output member. In the present embodiment, the power tool is embodied as a jigsaw 100, and for the jigsaw 100 of the present embodiment, the working accessory is embodied as a saw blade 14.

As shown in fig. 1, the jig saw 100 includes: the saw comprises a machine shell 11, a motor 12, a reciprocating rod 13 and a clamping device 20, wherein the motor 12 is arranged in the machine shell 11, and the clamping device 20 is used for clamping a saw blade 14.

It will be appreciated that in the present embodiment, the power tool is illustrated as a jigsaw 100, and in fact, it is within the scope of the present invention that the power tool requires a clamping device 20 substantially identical to the present invention to clamp a work attachment.

The motor 12 may be embodied as an electric motor, and the motor 12 can drive the reciprocating rod 13 to reciprocate. The reciprocating lever 13 extends in the direction of the first straight line 101. The clamping device 20 is connected to the reciprocating rod 13.

As shown in fig. 1 to 6, the clamping device 20 includes: a device body 21, a locking system 22 and an operating member 23. Wherein the device body 21 is used for fixedly connecting the clamping device 20 to the reciprocating rod 13, the locking system 22 is used for locking the saw blade 14 to the device body 21, and the operating member 23 is used for being operated by a user.

The device body 21 is also formed with a chamber 211, and the chamber 211 may be open. When the saw blade 14 is mounted to the clamping device 20, a portion of the saw blade 14 is received within the cavity 211.

The locking system 22 has a locked state as shown in fig. 2 and a released state as shown in fig. 7. When the locking system 22 is in the locked state, the saw blade 14 is locked to the device body 21; when the locking system 22 is in the released state, the saw blade 14 can be either detached from the device body 21 or inserted into the device body 21. The operating member 23 is operable by a user to actuate the locking system 22 from the locked state to the released state. When the saw blade 14 is inserted into the cavity 211, the saw blade 14 itself can apply a trigger force to the locking system 22 that actuates the locking system 22 from the released state to the locked state. Thus, the user only needs to hold the saw blade 14 with one hand and insert the saw blade 14 into the cavity 211 of the device body 21 to complete the installation of the saw blade 14, and does not need to operate the operating element 23 with one hand and the saw blade 14 with the other hand, so that the installation of the saw blade 14 can be completed with one-hand operation, and the convenience of operation is further improved.

As shown in fig. 2 to 13, the locking system 22 includes: locking member 221, drive member 222, and biasing member 223. The locking member 221 is movably connected to the device body 21, and the locking member 221 can move to a first position for locking the saw blade 14 and a second position for releasing the saw blade 14 when moving relative to the device body 21. As shown in fig. 2-6, when the locking member 221 is in the first position, the locking member 221 contacts the blade 14 and locks the position of the blade 14 relative to the device body 21. The drive member 222 applies a driving force to the saw blade 14 when the locking system 22 is switched from the locked condition to the released condition, which driving force can cause the saw blade 14 to have a tendency to be ejected, even if the driving force directly ejects the saw blade 14. Thus, when the user needs to disassemble the saw blade 14, the user can automatically eject the saw blade 14 only by operating the operating member 23 with one hand, and the user does not need to operate the operating member 23 with one hand and pull out the saw blade 14 with the other hand, thereby facilitating the operation of the user. The biasing member 223 biases the locking member 221 to create a biasing force that moves the locking member 221 from the second position to the first position.

Specifically, the apparatus main body 21 is formed with a hole 212, the hole 212 communicates with the chamber 211, and a penetrating direction of the hole 212 is perpendicular to the first straight line 101. The aperture 212 is a generally kidney shaped aperture 212. The extending direction of the kidney hole 212 is substantially perpendicular to the penetrating direction. The hole 212 further includes, in its extending direction, a first hole wall portion 212a, a second hole wall portion 212b, and a connecting portion 212 c. The first hole wall portion 212a is for receiving the lock piece 221 and making the lock piece 221 be at the first position at this time, that is, when the lock piece 221 is at the first position, the lock piece 221 is in contact with the first hole wall portion 212 a. As shown in fig. 6 and 9, the second hole wall portion 212b is for receiving the locking piece 221 and making the locking piece 221 be in the second position at this time, that is, when the locking piece 221 is in the second position, the locking piece 221 is in contact with the second hole wall portion 212 b. The connecting portion 212c connects the first hole wall portion 212a and the second hole wall portion 212b and the first hole wall portion 212 and the second hole wall portion 212b form a step 212d at the connection, so that the second hole wall portion 212b is recessed with respect to the first hole wall portion 212 a. In this embodiment, the saw blade 14 has a contact plane 141 for contacting the locking member 221, the first hole wall portion 212a extends along a plane, and the plane where the contact plane 141 is located intersects the plane where the first hole wall portion 212a to form an included angle of 10 degrees or more and 20 degrees or less, so that a self-locking structure is formed when the locking member 221 contacts the contact plane 141 and the first hole wall portion 212, respectively.

The locking element 221 is a pin extending in the direction of the second line 102, the pin further being cylindrical. The extending direction of the pin coincides with the penetrating direction of the hole 212. The pin passes through the hole 212 and a portion of the pin is disposed within the hole 212 such that the pin is movable to a first position and a second position along the direction of extension of the hole 212. When the pin moves from the first position toward the second position along the direction of extension of the hole 212, the pin is stopped by the step 212d when it moves to the second hole wall portion 212b so that the pin is prevented from moving toward the first position, and the pin is held in the second position so that the locking system 22 is in a released state.

The driving member 222 includes: a first driving part 222a and a second driving part 222 b. The first driving portion 222a can apply a driving force to the saw blade 14 when the locking system 22 is switched from the locked state to the released state, the driving force causing the saw blade 14 to be ejected out of the device body 21. The second driving portion 222b is used for driving the locking member 221 to move from the second position to the first position when the saw blade 14 applies the trigger force to the locking system 22, so that the locking member 221 locks the position of the saw blade 14 relative to the device body 21. In the present embodiment, when the saw blade 14 is inserted into the device body 21, the trigger force applied by the saw blade 14 to the locking system 22 can be directly applied to the second driving portion 222 b.

Specifically, the driver 222 further includes a rotation shaft portion 222c, and the driver 222 is rotatably connected to the apparatus main body 21 via the rotation shaft portion 222c with the first axis 103 as an axis. The first axis 103 of rotation of the driver 222 relative to the device body 21 is also perpendicular to the first line 101 along which the reciprocating rod 13 extends. The first driving portion 222a and the second driving portion 222b are disposed on both sides of a plane passing through the first axis 103. A portion of the saw blade 14 contacting the first driving portion 222a is disposed between the first driving portion 222a and the second driving portion 222b, and the locking member 221 is also disposed substantially between the first driving portion 222a and the second driving portion 222 b. Thus, when the saw blade 14 applies the trigger force to the first driving portion 222a, the driving member 222 will rotate around the first axis 103, and the second driving portion 222b will contact the locking member 221 located at the second position and apply a driving force to the locking member 221, and the driving force drives the locking member 221 to move to the first hole wall portion 212a over the step 212d, so that the locking member 221 locks the position of the saw blade 14 relative to the device body 21; when the locking member 221 moves from the first position to the second position, when the locking member 221 moves to the step 212d, the position of the locking member 221 changes instantaneously, the locking member 221 moves to the wall of the second hole 212, the locking member 221 contacts with the second driving portion 222b and applies a driving force to the second driving portion 222b, the driving member 222 rotates around the first axis 103, and the first driving portion 222a applies a driving force to the saw blade 14 to eject the saw blade 14.

The biasing member 223 may be embodied as a torsion spring, and both walls of the torsion spring may be connected to the body of the device and the locking piece 221, respectively. When the locking member 221 is driven by the driver 222 out of the limit of the step 212d, the torsion spring can now bias the locking member 221 to return the locking member 221 to the first position, thereby locking the position of the saw blade 14.

The operating member 23 is rotatably coupled to the apparatus body 21 about a second axis 104, and the second axis 104 about which the operating member 23 rotates with respect to the apparatus body 21 may be parallel to the first axis 103. When the user operates the operating member 23, the operating member 23 contacts the locking member 221 and can drive the locking member 221 to move from the first position toward the second position against the bias of the biasing member 223.

The operation and operation of the saw blade 14 mounted by the clamping device 20 of the present invention is described in detail as follows: first, as shown in fig. 7 to 9, when the saw blade 14 is not mounted to the clamping device 20, the locking system 22 is in the released state, the locking member 221 is in the second position, and when the locking member 221 is biased by the biasing element 223, it has a tendency to move towards the first position, but the locking member 221 remains in the second position and in contact with the second hole wall portion 212b because it is limited by the step 212 d. Then, as shown in fig. 10 to 11, the user operates the saw blade 14 to insert into the device body 21, and the saw blade 14 is not yet in contact with the driving member 222, so that the locking system 22 is still in the release state. Then, the user operates the saw blade 14 to move further toward the inside of the device body 21 until the saw blade 14 moves to the position contacting with the driving member 222 as shown in fig. 12 and 13, at which time, the saw blade 14 applies an activation force to the first driving portion 222a, the activation force causes the driving member 222 to rotate relative to the device body 21 about the first axis 103 in the direction of the arrow in fig. 13, and at this time, the second driving portion 222b drives the locking member 221 to disengage from the second hole wall portion 212b and to pass over the step 212d to limit the same. Finally, under the biasing force of the biasing element 223, the lock 221 is reset to the first position shown in fig. 4, such that the lock 221 simultaneously contacts the contact flat 141 and the first aperture wall portion 212a of the saw blade 14, the locking system 22 is in the locked state, and the position of the saw blade 14 is locked.

The following details the operation and operation of the saw blade 14 removed from the clamping device 20: first, as shown in fig. 2 to 4, the locking system 22 locks the position of the saw blade 14 relative to the device body 21, and the locking piece 221 simultaneously contacts the contact plane 141 of the saw blade 14 and the wall of the first hole 212. Then, the user rotates the operating member 23 from the position shown in fig. 2 to the position shown in fig. 7, and at this time, as shown in fig. 7 to 9, the operating member 23 drives the locking member 221 to move from the first position to the second position against the bias of the biasing member 223, when the locking member 221 moves to the step 212d, the position of the locking member 221 changes abruptly so as to apply a driving force to the second driving portion 222b to make the driving member 222 rotate a certain angle instantaneously, and at this time, the first driving portion 222a will apply a driving force to the saw blade 14 to make the saw blade 14 be ejected out of the device body 21.

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 clamping device for clamping a work attachment, comprising:

a device body defining a chamber for receiving at least part of said working attachment;

a locking system having at least a locking state of locking the working attachment to the apparatus body and a releasing state of releasing the working attachment to allow the working attachment to be detached from the apparatus body;

the operating piece drives the locking system to be switched from the locking state to the releasing state when being operated by a user;

the locking system comprises:

a locking member that locks the working attachment when in contact with the working attachment;

a drive member for driving the locking member to move to lock the working accessory into the cavity of the device body when the working accessory applies a trigger force to the locking system;

wherein said working attachment is itself capable of applying a trigger force to said locking system upon insertion of said working attachment into said chamber to actuate said locking system from said released state to said locked state.

2. A clamping device for clamping a work attachment as claimed in claim 1, wherein:

the drive member applies a driving force to the working attachment when the locking system is switched from the locked state to the released state, the driving force tending to eject the working attachment.

3. A clamping device for clamping a work attachment as claimed in claim 1, wherein:

the driving piece ejects the working accessory when the locking system is switched from the locking state to the releasing state.

4. A clamping device for clamping a work attachment as claimed in claim 1, wherein:

the locking system comprises:

an aperture comprising a first aperture wall portion for receiving the locking element;

when the locking system is in the locked state, the locking member is in a first position in simultaneous contact with the working attachment and the first aperture wall portion.

5. A clamping device for clamping a work attachment according to claim 4, wherein:

the aperture further comprises a second aperture wall portion for receiving the locking element;

said locking member being in a second position in contact with said second aperture wall portion when said locking system is in said released condition;

the second aperture wall portion is recessed relative to the first aperture wall portion.

6. A clamping device for clamping a work attachment according to claim 5, wherein:

the hole further comprises a connecting portion for connecting the first and second hole wall portions such that both form a step at the connection.

7. A clamping device for clamping a work attachment according to claim 5, wherein:

the driving member includes a first driving portion for applying a driving force to the working attachment for ejecting the working attachment when the locking system is switched from the locked state to the released state;

the driver further includes: a second drive portion that drives the locking member from the second position to the first position when the working attachment applies a trigger force to the locking system.

8. A clamping device for clamping a work attachment as claimed in claim 7, wherein:

the driving piece and the device body form rotary connection by taking a first axis as a shaft;

the first and second drive portions are located on either side of a plane passing through the first axis.

9. A clamping device for clamping a work attachment as claimed in claim 7, wherein:

the locking system further comprises:

a biasing element creating a biasing force biasing the locking member from the second position to the first position.

10. A power tool, comprising:

a housing;

a motor disposed within the housing;

an output member driven by the motor to output power;

the method is characterized in that:

the electric tool further comprises a holding device for holding a working attachment according to any one of claims 1 to 9; the clamping device is connected to the output.