A quick-change device for oscillating saw blades

Abstract

This invention discloses a quick-change device for a oscillating saw blade. An oscillating sleeve is vertically mounted in the inner cavity of the machine housing via bearings. An oscillating shaft is vertically movably inserted into the oscillating sleeve. The upper end of the oscillating shaft extends upwards from the upper end of the oscillating sleeve, and the lower end extends downwards from the lower end of the oscillating sleeve and is fixedly connected to a connecting block. The insertion end of the saw blade is inserted between the connecting block and the oscillating sleeve. A clamping structure is provided between the oscillating shaft and the oscillating sleeve to press and lock the insertion end of the saw blade between the connecting block and the oscillating sleeve. An unlocking structure is provided between the oscillating shaft and the machine housing to release the clamping force of the connecting block on the insertion end of the saw blade. A locking structure is provided between the button and the machine housing to lock the button in a horizontal position. An anti-pinch structure is provided between the button and the machine housing. This device has a simple and compact structure, is easy to use and operate, allows for quick saw blade replacement, and has an anti-pinch function.

Description

Technical Field

[0001] This invention relates to oscillating saws, and more particularly to a quick blade replacement device for oscillating saws. Background Technology

[0002] A oscillating saw is an electric sawing device that drives a saw blade to oscillate back and forth to cut materials. It is also a portable small power tool. Common oscillating saws mainly consist of a housing, an oscillating shaft, a saw blade, and a drive structure that drives the oscillating shaft to oscillate back and forth. The saw blade is usually fixed to the bottom of the oscillating shaft with fasteners. For example, in the oscillating saw disclosed in Chinese invention patent application No. 201821996694.9, the saw blade is also fastened to the bottom of the oscillating shaft with fasteners. Replacing the saw blade requires auxiliary tools, making the blade replacement inconvenient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a quick saw blade replacement device for oscillating saws that is simple in structure, can quickly replace saw blades, and has an anti-pinch function.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A quick-change device for a swing saw blade includes: a housing, a saw blade, and a swing shaft. The swing shaft sleeve is vertically installed in the inner cavity of the housing through a bearing, and the lower end of the swing shaft sleeve extends out of the bottom through hole of the housing. The swing shaft is vertically movably inserted into the swing shaft sleeve, and the upper end of the swing shaft extends upward from the upper end of the swing shaft sleeve and is located in the inner cavity of the housing. The lower end of the swing shaft extends downward from the lower end of the swing shaft sleeve and is fixedly connected to a connecting block. The insertion end of the saw blade is inserted between the connecting block and the swing shaft sleeve. A clamping structure is provided between the swing shaft and the swing shaft sleeve to make the swing shaft move upward relative to the swing shaft sleeve, thereby pressing and locking the insertion end of the saw blade between the connecting block and the swing shaft sleeve. An unlocking structure is provided between the swing shaft and the machine housing to release the clamping force of the connecting block locked on the insertion end of the saw blade. The unlocking structure allows the swing shaft to overcome the clamping force of the clamping structure and move downward relative to the swing shaft sleeve, thereby moving the connecting block fixed on the swing shaft away from the saw blade, so as to achieve the purpose of pulling the insertion end of the saw blade out from between the connecting block and the swing shaft sleeve.

[0005] The unlocking structure includes a button, one end of which is a pressing end, and the other end of which is a cam end with a cam profile surface. The cam end of the button is hinged to a through hole at the top of the housing above the swing shaft. When the button is in the horizontal position, the unlocking structure is in the unlocked state. At this time, the insertion end of the saw blade is pressed and locked between the connecting block and the swing shaft sleeve under the clamping force of the clamping structure. When the button is in the horizontal position, the distance from each point on the profile curve of the cam profile surface to the hinge point between the button and the housing gradually increases clockwise from the lowest point of the profile curve. Therefore, when the button rotates counterclockwise around the hinge point between the button and the housing from the horizontal position, the counterclockwise rotating cam profile surface overcomes the clamping force of the clamping structure and pushes the swing shaft downward, thereby causing the connecting block to move downward away from the swing shaft sleeve. At this time, the insertion end of the saw blade can be pulled out from between the connecting block and the swing shaft sleeve.

[0006] Furthermore, in the aforementioned oscillating saw blade quick-change device, when the button is in the horizontal position, there is a gap H2 between the upper end of the oscillating shaft and the lowest end of the cam profile surface, and the maximum distance from the cam profile surface to the hinge point between the button and the housing is H1, and the minimum distance from the cam profile surface to the hinge point between the button and the housing is H3, where H1 > the sum of H2 and H3.

[0007] To ensure that the saw blade's insertion end remains pressed and locked between the connecting block and the swing sleeve during use, this design incorporates a locking structure between the button and the housing to lock the button in its horizontal position. The locking structure consists of a locking element located on the housing behind the button's cam end. This locking element is integrally formed from a horizontal plate, side baffles that smoothly curve upwards and inwards from both ends of the horizontal plate, and rolled edges that smoothly fold outwards from the tops of the two side baffles. The horizontal plate is fixed to the housing, and a locking groove is formed between the two side baffles. A downward-protruding locking block, capable of engaging in the locking groove, is located on the bottom surface of the button, with outward-protruding strips on both sides of the locking block.

[0008] As the button swings around the hinge point between the button and the housing to a horizontal position, the gap between the button and the housing becomes smaller and smaller. In order to prevent the hand from being pinched in the gap between the button and the housing during operation, this solution is equipped with an anti-pinch structure between the button and the housing. The anti-pinch structure includes: an anti-pinch block, one end of which is a hinged end and the other end of which is an abutment end. A protruding resting block is provided on the top surface of the anti-pinch block between the hinged end and the abutment end. The hinged end of the anti-pinch block is hinged to the housing behind the cam end of the button via a first hinge shaft. A stop block is provided on the housing between the hinged end of the anti-pinch block and the cam end of the button. A torsion spring is fitted on the first hinge shaft. Under the elastic force of the torsion spring, the anti-pinch block swings counterclockwise around the first hinge shaft until the resting block abuts against the stop block. At this time, the button swings clockwise around the hinge point between the button and the housing until the button abuts against the abutment end of the anti-pinch block. The button can no longer swing clockwise, and the distance between the button and the housing at this position will not pinch the hand. If it is necessary to continue swinging the button clockwise to the horizontal position, the anti-pinch block needs to be pushed so that it overcomes the elastic force of the torsion spring and swings clockwise around the first hinge axis to the horizontal position. The button can continue to swing clockwise to the horizontal position under the action of external force and then be locked in the horizontal position by the locking structure.

[0009] Furthermore, in the aforementioned quick-change device for oscillating saw blades, a connecting shaft is provided on at least one side of the two sides of the abutment end of the anti-pinch block.

[0010] Furthermore, in the aforementioned quick-change device for a oscillating saw blade, the clamping structure comprises: an inner channel of the oscillating bushing consisting of an upper channel and a lower channel forming a stepped channel structure, with the diameter of the upper channel being smaller than that of the lower channel; an upper stop block is fixedly installed on the oscillating shaft located in the lower channel, and a lower stop block is fixedly installed on the wall of the lower channel; a compression spring is fitted onto the oscillating shaft between the upper and lower stop blocks, and under the elastic force of the compression spring, both ends of the compression spring press against the upper and lower stop blocks respectively. When the unlocking structure is in the unlocked state, the elastic force of the compression spring presses and locks the insertion end of the saw blade between the connecting block and the oscillating bushing.

[0011] To ensure a more secure clamping and locking of the saw blade between the connecting block and the swing sleeve, this design includes an outwardly protruding shoulder at the lower end of the swing sleeve. Several vertically placed connecting posts are arranged around and evenly spaced on the bottom surface of the shoulder. Connecting through holes corresponding to the positions of each connecting post are provided on the insertion end of the saw blade. When the insertion end of the saw blade is clamped and locked between the connecting block and the swing sleeve under the clamping force of the clamping structure, each connecting post is located in the corresponding connecting through hole, thus ensuring that the clamped and locked saw blade is securely positioned and will not shift circumferentially.

[0012] Furthermore, in the aforementioned oscillating saw blade quick-change device, the button is composed of a button body and a cam. Two forward-extending hinge plates are provided on the button body, and the two hinge plates are hinged to the machine housing through a second hinge shaft. The outer contour of the cam is composed of a pressing surface and a cam contour curved surface. The cam is hinged to the second hinge shaft between the two hinge plates, and the pressing surface of the cam abuts against the front end face of the button body between the two hinge plates.

[0013] The beneficial effects of the present invention are: the device has a simple and compact structure, is easy to use and operate, can quickly replace the saw blade without the aid of auxiliary tools, and has an anti-pinch function, which greatly improves the ease of use and safety of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the quick-change device for oscillating saw blades of the present invention after it is installed in the oscillating saw.

[0015] Figure 2 yes Figure 1 A schematic diagram showing the position and structure of the connecting block, the swing bushing, and the housing.

[0016] Figure 3 yes Figure 1 A partial structural diagram of the button and housing.

[0017] Figure 4 This is a partial structural diagram of the button area after part of the casing has been removed.

[0018] Figure 5 This is a schematic diagram showing the position and structure of the button when it is blocked by the anti-pinch structure.

[0019] Figure 6 This is a schematic diagram showing the position and structure between the button and the locking mechanism.

[0020] Figure 7 yes Figure 1 A schematic diagram of a local internal structure.

[0021] Figure 8 This is a schematic diagram showing the position and structure between the swing axis and the button.

[0022] Figure 9 This is a schematic diagram showing the position of the unlocking structure when the button swings counterclockwise around the second hinge axis.

[0023] Figure 10 This is a schematic diagram showing the position of the button when it swings clockwise around the second hinge axis to a horizontal position. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0025] Example 1

[0026] Currently, common oscillating saws mainly consist of a housing, an oscillating shaft, a saw blade, and a drive structure that drives the oscillating shaft to oscillate back and forth. The saw blade is usually fixed to the bottom of the oscillating shaft by fasteners. For example, the oscillating saw disclosed in Chinese invention patent application No. 201821996694.9 also has its saw blade fastened to the bottom of the oscillating shaft by fasteners. Replacing the saw blade requires auxiliary tools, making the blade replacement inconvenient. This embodiment is an improved design addressing this inconvenience by creating a quick saw blade replacement device that allows for rapid blade replacement without the need for auxiliary tools, while maintaining the original structure of the oscillating saw.

[0027] like Figure 1 , Figure 2 , Figure 7 and Figure 10 As shown, the quick-change device for a oscillating saw blade in this embodiment includes: a housing 1, a saw blade 2, and an oscillating shaft 3. An oscillating sleeve 4 is vertically mounted in the inner cavity of the housing 1 via a bearing. The lower end of the oscillating sleeve 4 extends out of the bottom through-hole 11 of the housing 1. The oscillating sleeve 4 is driven by a drive structure to oscillate back and forth. The drive structure can refer to the drive structure disclosed in Chinese invention patent application No. 201821996694.9. The oscillating shaft 3 is vertically movably inserted into the oscillating sleeve 4. The upper end of the oscillating shaft 3 extends upward from the upper end of the oscillating sleeve 4, and the upper end of the oscillating shaft 3 is located in the inner cavity of the housing 1. The lower end of the swing shaft 3 extends downward from the lower end of the swing shaft sleeve 4 and is fixedly connected to the connecting block 31. The insertion end of the saw blade 2 is inserted between the connecting block 31 and the swing shaft sleeve 4. A clamping structure is provided between the swing shaft 3 and the swing shaft sleeve 4 to make the swing shaft 3 move upward relative to the swing shaft sleeve 4, thereby pressing and locking the insertion end of the saw blade 2 between the connecting block 31 and the swing shaft sleeve 4.

[0028] In this embodiment, an unlocking structure is provided between the swing shaft 3 and the housing 1, where the unlocking connecting block 31 presses against the clamping force on the insertion end of the saw blade 2. The unlocking structure allows the swing shaft 3 to overcome the clamping force of the clamping structure and move downward relative to the swing shaft sleeve 4, thereby moving the connecting block 31 fixed on the swing shaft 3 away from the saw blade 2, so as to achieve the purpose of pulling the insertion end of the saw blade 2 out from between the connecting block 31 and the swing shaft sleeve 4.

[0029] like Figure 4 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the unlocking structure described in this embodiment includes: a button 6, one end of which is a pressing end 61, and the other end of which is a cam end 62 with a cam profile surface 63. The cam end 62 of the button 6 is hinged to the top through hole of the housing 1 above the swing shaft 3.

[0030] The top end of the swing shaft 3 presses against the cam profile surface 63 of the cam end 62 of the button 6 under the clamping force of the clamping structure.

[0031] When button 6 is in the horizontal position, the unlocking mechanism is in the unlocked state, such as... Figure 10 As shown, at this time, the insertion end of the saw blade 2 is pressed and locked between the connecting block 31 and the swing sleeve 4 under the clamping force of the clamping structure. When the button 6 is in the horizontal position, the distance from each point on the profile curve of the cam profile surface 63 to the hinge point between the button 6 and the housing 1 gradually increases from the lowest point of the profile curve in the clockwise direction. Therefore, when the button 6 swings counterclockwise around the hinge point between the button 6 and the housing 1 from the horizontal direction, the counterclockwise rotating cam profile surface 63 overcomes the clamping force of the clamping structure and pushes the swing shaft 3 downward, thereby causing the connecting block 31 to move downward away from the swing sleeve 4, as shown. Figure 9 As shown, at this time, there is a gap 100 between the connecting block 31 and the swing sleeve 4 for the insertion end of the saw blade to be pulled out. The insertion end of the saw blade 2 can be easily pulled out from between the connecting block 31 and the swing sleeve 4, and the new saw blade can be reinserted into the gap 100. Then, press the button 6 to make the button 6 swing clockwise around the hinge point between the button 6 and the housing 1 to the horizontal position. At this time, the insertion end of the replaced saw blade is pressed and locked between the connecting block 31 and the swing sleeve 4 under the pressing force of the pressing structure.

[0032] When the button is in the horizontal position, a gap H2 is left between the upper end of the swing shaft 3 and the lowest end of the cam profile surface 63 to prevent wear caused by contact between the driven swing shaft 3 and the cam profile surface 63 when the swing shaft sleeve 4 swings back and forth under the drive of the drive structure. The maximum distance from the cam profile surface to the hinge point between the button and the housing is H1, and the minimum distance from the cam profile surface to the hinge point between the button and the housing is H3, and H1 > H2 + H3. This ensures that during the counterclockwise swing of the button 6 around the hinge point between the button 6 and the housing 1, the cam profile surface 63 transitions from a state of not contacting the upper end of the swing shaft 3 to a state of contacting the upper end of the swing shaft 3, and then to a state of pushing the swing shaft 3 downward.

[0033] In order to ensure that the insertion end of the saw blade 2 is always pressed and locked between the connecting block 31 and the swing sleeve 4 during use, this solution provides a locking structure between the button 6 and the housing 1 to lock the position of the button 6 when it is in a horizontal position.

[0034] As button 6 swings clockwise around the hinge point between button 6 and housing 1 to a horizontal position, the gap between button 6 and housing 1 becomes smaller and smaller. In order to prevent the hand from being pinched in the gap between button 6 and housing 1 during operation, this solution provides an anti-pinch structure between button 6 and housing 1.

[0035] The above-mentioned device has a simple and compact structure, is easy to use and operate, allows for quick replacement of saw blades without the need for auxiliary tools, and has an anti-pinch function, which greatly improves the ease of use and safety of the device.

[0036] Example 2

[0037] This embodiment elaborates on the locking structure based on Embodiment 1.

[0038] like Figure 4 , Figure 5 and Figure 6 As shown, the locking structure described in this embodiment is as follows: a locking element 7 is provided on the housing 1 located behind the cam end 62 of the button 6. The locking element 7 is integrally formed by a horizontal plate 71, side baffles 72 formed by smoothly bending upwards and gradually inwards from both ends of the horizontal plate 71, and rolled edges 73 formed by smoothly flipping outwards from the top ends of the two side baffles 72. The horizontal plate 71 is fixed to the housing 1, and the two side baffles 72 form a locking groove 74. A locking block 64 is provided on the bottom surface of the button 6, which protrudes downwards and can be locked into the locking groove 74. Outwardly protruding ridges 65 are provided on both sides of the locking block 64. The structure formed by bending the locking member 7 as described above can make the whole body slightly elastic. When the button 6 is rotated clockwise to the horizontal position, the two protrusions 65 on the locking block 64 move to the opening of the locking groove 74. At this time, the width of the opening of the locking groove 74 is less than the overall width at the position of the protrusions 65. Under the downward pressing action of the locking block 64, the protrusions 65 push the opening of the locking groove 74 to open outward and slide into the locking groove 74. At this time, the opening of the locking groove 74 returns to the original opening size. Therefore, the locking block 64, which is locked in the locking groove 74, will not come out of the locking groove 74 without the action of external force.

[0039] Example 3

[0040] This embodiment elaborates on the anti-pinch structure based on Embodiment 1 or Embodiment 2.

[0041] like Figure 3 , Figure 4 and Figure 5As shown, the anti-pinch structure described in this embodiment includes an anti-pinch block 8, one end of which is a hinge end 81, and the other end of which is an abutment end 82. A protruding resting block 83 is provided on the top surface of the anti-pinch block 8 between the hinge end 81 and the abutment end 82. The hinge end 81 of the anti-pinch block 8 is hinged to the housing 1 behind the cam end 62 of the button 6 via a first hinge shaft 80. A stop block 12 is provided on the housing 1 between the hinge end 81 of the anti-pinch block 8 and the cam end 62 of the button 6. A torsion spring 84 is fitted on the first hinge shaft 80. Under the elastic force of the torsion spring 84, the anti-pinch block 8 swings counterclockwise around the first hinge shaft 80 until the resting block 83 abuts against the stop block 12. At this point, button 6 swings clockwise around the hinge point between button 6 and housing 1 until button 6 abuts against the abutting end 82 of anti-pinch block 8. Button 6 is then blocked by the abutting end 82 and cannot continue to swing clockwise. The position of button 6 at this point is described in [reference needed]. Figure 5 and Figure 8 As shown, this prevents the finger from being pinched. To continue rotating button 6 clockwise to the horizontal position, push the anti-pinch block 8, causing it to overcome the spring force of the torsion spring 84 and rotate clockwise around the first hinge axis 80 to the horizontal position. Press button 6 to continue rotating it clockwise to the horizontal position, where it will then be locked in place by the locking mechanism. The position of button 6 at this point is shown in the diagram. Figure 3 and Figure 4 As shown.

[0042] When button 6 swings clockwise around the hinge point between button 6 and housing 1 until button 6 abuts against the abutting end 82 of anti-pinch block 8 and can no longer swing clockwise, it is necessary to push anti-pinch block 8. In order to facilitate pushing anti-pinch block 8, in this embodiment a connecting shaft 85 is provided on at least one side of the abutting end 82 of anti-pinch block 8.

[0043] Example 4

[0044] This embodiment elaborates on the compression structure based on Embodiment 1, Embodiment 2, or Embodiment 3.

[0045] like Figure 7 and Figure 10As shown, the clamping structure described in this embodiment is as follows: the inner channel of the swing shaft sleeve 4 is formed by an upper channel 41 and a lower channel 42 from top to bottom, forming a stepped channel structure. The diameter of the upper channel 41 is smaller than the diameter of the lower channel 42. An upper stop 32 is fixedly installed on the swing shaft 3 located in the lower channel 42, and a lower stop 43 is fixedly installed on the hole wall of the lower channel 42. A compression spring 5 is fitted on the swing shaft 4 between the upper stop 32 and the lower stop 43. When the swing shaft 3 is not subjected to a downward pressing force, under the elastic force of the compression spring 5, the two ends of the compression spring 5 press against the upper stop 32 and the lower stop 43 respectively. At this time, the swing shaft 3 moves upward under the elastic force of the compression spring 5 until the connecting block 31 presses against the insertion end of the saw blade located between the connecting block 31 and the swing shaft sleeve 4, thereby achieving the purpose of pressing and locking the insertion end of the saw blade 2 between the connecting block 31 and the swing shaft sleeve 4.

[0046] To ensure a more secure clamping and locking of the saw blade 2 between the connecting block 31 and the swing sleeve 4, this design includes an outwardly protruding shoulder 44 at the lower end of the swing sleeve 4. Several vertically placed connecting posts 45 are spaced apart on the bottom surface of the shoulder 44. A connecting through hole corresponding to the position of each connecting post 45 is provided on the insertion end of the saw blade 2. When the insertion end of the saw blade 2 is clamped and locked between the connecting block 31 and the shoulder 44 of the swing sleeve 4 under the clamping force of the clamping structure, each connecting post 45 is located in the corresponding connecting through hole on the insertion end of the saw blade 2.

[0047] Example 5

[0048] This embodiment elaborates on the specific structure of the button based on embodiment one, embodiment two, embodiment three, or embodiment four.

[0049] like Figure 4 , Figure 9 and Figure 10 As shown, the button 6 in this embodiment consists of a button body 601 and a cam 602. Two forward-extending hinge plates 603 are provided on the button body 601, and the two hinge plates 603 are hinged to the housing 1 via a second hinge shaft 604. The outer contour of the cam 602 is composed of a pressing surface 605 and a cam profile curved surface 63. The cam 602 is hinged to the second hinge shaft 604 between the two hinge plates 603, and the pressing surface 605 of the cam 602 abuts against the front end face of the button body 601 between the two hinge plates 603. When the button body 601 swings around the second hinge shaft 604, the front end face of the button body 601 pushes the pressing surface 605 of the cam 602, thereby causing the cam 602 to rotate synchronously and in the same direction as the button body 601. Setting button 6 as a separate unit makes it easier to manufacture, and when cam 602 wears out, it is not necessary to replace the entire button 6, but only cam 602 needs to be replaced, thus reducing the cost of use.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A quick-change device for a oscillating saw blade, comprising: A housing, a saw blade, and a swing shaft, characterized in that: a swing shaft sleeve is vertically installed in the inner cavity of the housing via a bearing; the lower end of the swing shaft sleeve extends out of the bottom through hole of the housing; the swing shaft is vertically movably inserted into the swing shaft sleeve; the upper end of the swing shaft extends upward from the upper end of the swing shaft sleeve; the lower end of the swing shaft extends downward from the lower end of the swing shaft sleeve and is fixedly connected to a connecting block; the insertion end of the saw blade is inserted between the connecting block and the swing shaft sleeve; a clamping structure is provided between the swing shaft and the swing shaft sleeve to allow the swing shaft to move upward relative to the swing shaft sleeve, thereby pressing and locking the insertion end of the saw blade between the connecting block and the swing shaft sleeve; an unlocking structure is provided between the swing shaft and the housing to unlock the clamping force of the connecting block on the insertion end of the saw blade, the unlocking structure including: a button, one end of which is a pressing end; the button... The other end is a cam end with a cam profile surface. The cam end of the button is hinged to the top through hole of the housing above the swing shaft. When the button is in the horizontal position, the unlocking structure is not unlocked, and the distance from each point on the profile curve of the cam profile surface to the hinge point between the button and the housing gradually increases from the lowest point of the profile curve in a clockwise direction. A locking structure is provided between the button and the housing to lock the button position when it is in the horizontal position. An anti-pinch structure is provided between the button and the housing. When the button is in the horizontal position, there is a gap H2 between the upper end of the swing shaft and the lowest end of the cam profile surface. The maximum distance from the cam profile surface to the hinge point between the button and the housing is H1, and the minimum distance from the cam profile surface to the hinge point between the button and the housing is H3. H1 > the sum of H2 and H3.

2. The quick-change device for a oscillating saw blade according to claim 1, characterized in that: The anti-pinch structure includes: an anti-pinch block, one end of which is a hinged end and the other end of which is an abutment end. An outwardly protruding resting block is provided on the top surface of the anti-pinch block between the hinged end and the abutment end. The hinged end of the anti-pinch block is hinged to the housing behind the cam end of the button via a first hinge shaft. A stop block is provided on the housing between the hinged end of the anti-pinch block and the cam end of the button. A torsion spring is fitted on the first hinge shaft. Under the elastic force of the torsion spring, the anti-pinch block swings counterclockwise around the first hinge shaft until the resting block abuts against the stop block.

3. The quick-change device for a oscillating saw blade according to claim 2, characterized in that: A connecting shaft is provided on at least one side of the abutting end of the anti-pinch block.

4. The quick-change device for a oscillating saw blade according to claim 1, characterized in that: The locking structure is as follows: a locking element is provided on the housing behind the cam end of the button. The locking element is integrally formed by a horizontal plate, side baffles that are smoothly curved upward and gradually inward from both ends of the horizontal plate, and rolled edges that are smoothly flipped outward from the top of the two side baffles. The horizontal plate is fixed to the housing, and the two side baffles form a locking groove. A locking block that protrudes downward and can be locked in the locking groove is provided on the bottom surface of the button. Outward protruding strips are provided on both sides of the locking block.

5. A quick-change device for a oscillating saw blade according to claim 1, characterized in that: The clamping structure is as follows: the inner channel of the swing shaft sleeve is composed of an upper channel and a lower channel forming a stepped channel structure from top to bottom, and the diameter of the upper channel is smaller than that of the lower channel; an upper stop is fixedly installed on the swing shaft located in the lower channel, and a lower stop is fixedly installed on the hole wall located in the lower channel; a compression spring is fitted on the swing shaft between the upper stop and the lower stop, and under the elastic force of the compression spring, the two ends of the compression spring press against the upper stop and the lower stop respectively.

6. A quick-change device for a oscillating saw blade according to claim 1 or 5, characterized in that: A shoulder protruding outward is provided at the lower end of the swing bushing. Several vertically placed connecting posts are arranged around and evenly spaced on the bottom surface of the shoulder. A connecting through hole corresponding to the position of each connecting post is opened on the insertion end of the saw blade. When the insertion end of the saw blade is pressed and locked between the connecting block and the swing bushing under the pressing force of the pressing structure, each connecting post is located in the corresponding connecting through hole.

7. The quick-change device for a oscillating saw blade according to claim 1, characterized in that: The button consists of a button body and a cam. Two forward-extending hinge plates are provided on the button body. The two hinge plates are hinged to the housing through a second hinge shaft. The outer contour of the cam consists of a pressing surface and a cam profile surface. The cam is hinged to the second hinge shaft between the two hinge plates, and the pressing surface of the cam abuts against the front end face of the button body between the two hinge plates.

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