Self-locking structure of electric hammer

Abstract

The utility model discloses a self-locking structure of an electric hammer, which comprises a shell and a switch assembly arranged on the shell, the switch assembly comprises a switch button, the shell is provided with a self-locking assembly, the self-locking assembly comprises a self-locking button, a gear shifting piece, a connecting seat, a position conversion piece and an elastic reset piece, a first inclined guide part is arranged between every two adjacent levels of gears on the connecting seat, and a second inclined guide part is arranged between every two adjacent levels of gears on the connecting seat. The position conversion piece is connected with a self-locking pin, the elastic reset piece has elastic force for pushing the self-locking pin and the position conversion piece to move and reset, after the self-locking button is pressed by external force, the gear shifting piece pushes the position conversion piece downwards and drives the position conversion piece to rotate, and the position conversion piece enters different gears along the first inclined guide part. In the first self-locking state, the self-locking pin is moved and switched to the locking position, the switch button is not pressed down, the self-locking pin is blocked on the pressing stroke of the switch button to limit the switch button to be pressed down, and the situation that the machine is started by touching the switch button by mistake is prevented.

Description

Technical Field

[0001] The utility model relates to a hammer pick, in particular to a self-locking structure of an electric hammer. Background Art

[0002] Electric hammers and electric picks are widely used in construction, road paving and maintenance, home decoration, etc. for crushing, chiseling, excavating, grooving and other operations because they have three functions: hammer drill, single drill and single hammer, and are very popular among users.

[0003] For example, a high-efficiency electric hammer disclosed in Chinese utility model patent CN211517389U includes an electric hammer body, a brushless motor is arranged in the electric hammer body, the brushless motor is connected to a controller arranged at the bottom, the controller is connected to a knob speed regulation assembly arranged on the outside of the electric hammer body, the knob speed regulation assembly includes a six-speed regulating dial and a knob rotatably arranged on the six-speed regulating dial, a battery pack for power supply is arranged on one side of the electric hammer body, a first hand-held part is formed on one side of the electric hammer body, a switch button for starting and closing the electric hammer is arranged on the first hand-held part, the electric hammer starts after the switch button is pressed, and the switch button is reset and the electric hammer is turned off after the switch button is released.

[0004] Problems with existing electric hammers or electric picks: When the electric hammer or electric pick is powered on, the operator may accidentally touch the switch button and start the machine unexpectedly. The existing electric hammer or electric pick cannot prevent accidental touch well, and there are certain safety hazards. Utility Model Content

[0005] Based on the above problem that during the process of powering on the electric hammer or electric pick, the operator may accidentally touch the switch button and cause the machine to start unexpectedly, the utility model provides a self-locking structure of the electric hammer.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: the self-locking structure of the electric hammer comprises a shell, a switch assembly arranged on the shell and triggered by pressing, the switch assembly comprises a switch button for being pressed by a hand, and the switch button is reset after the pressing force disappears, the shell is provided with a self-locking assembly, the self-locking assembly comprises a self-locking button, a shifting member connected to the self-locking button, a connecting seat fixed on the shell and having multiple gears, a position conversion member and an elastic reset member that cooperate with the shifting member in linkage, a first inclined guide portion is provided between adjacent gears on the connecting seat, a self-locking pin is connected to the position conversion member, and the elastic reset member has an elastic force that pushes the self-locking pin and the position conversion member to move and reset, when the self-locking button is pressed by an external force, the shifting member pushes down the position conversion member and drives the position conversion member to rotate, the position conversion member enters different gears along the first inclined guide portion, so that the self-locking pin moves up and down and switches between the unlocking position and the locking position,

[0007] In the first self-locking state, the self-locking pin moves and switches to the locking position, and the switch button is not pressed, and the self-locking pin blocks the pressing stroke of the switch button to limit the switch button from being pressed.

[0008] A further preferred technical solution of the utility model is: a limit hole is provided on the switch button, and in the second self-locking state, the self-locking pin moves and switches to the locking position, and the switch button is pressed, and the self-locking pin is inserted into the limit hole on the switch button to limit the switch button from resetting.

[0009] A further preferred technical solution of the utility model is: the gear position includes a plurality of first gear positions and second gear positions formed in a circle, a second gear position is provided between two adjacent first gear positions, and a first inclined guide portion for guiding the position conversion member is provided between adjacent first gear positions and second gear positions; when the position conversion member enters the first gear position, the self-locking pin moves up to the unlocking position, and when the position conversion member enters the second gear position, the self-locking pin moves down to the locking position.

[0010] A further preferred technical solution of the utility model is: a connecting channel is provided in the connecting seat, and a plurality of gear protrusions are provided at equal intervals on the inner circumferential side wall of the connecting channel, and a vertical slot opening downward is formed between adjacent gear protrusions, and the vertical slot is used as the first gear position, and two guide teeth with a first inclined guide portion are provided on the lower edge of the gear protrusion, and the second gear position is formed between the two guide teeth, and the position conversion member can be movably accommodated in the connecting channel and is clamped in the first gear position or the second gear position, and the position of the first gear position for the position conversion member to be clamped and the position of the second gear position for the position conversion member to be clamped have a spacing in the direction of the position conversion member moving up and down, and one end of the gear shift member is inserted in the connecting channel for pushing the position conversion member down for shifting gears.

[0011] A further preferred technical solution of the utility model is: the slot has an upper bottom, the circumference of the lower end of the shift member is provided with limiting protrusions corresponding to each slot, the top of the connecting seat is provided with an insertion port for the lower end of the shift member to be inserted into the connecting channel, the lower end of the shift member is inserted into the connecting channel and the limiting protrusion is stuck in the corresponding slot, and the limiting protrusion can slide up and down along the slot.

[0012] A further preferred technical solution of the utility model is that the position conversion member has a gear clamping block on its circumference for clamping into the first gear or the second gear.

[0013] A further preferred technical solution of the utility model is: the position conversion member is located below the gear shift member, a first slot for inserting the position conversion member is provided at the bottom of the gear shift member, a flange is provided at the lower end of the position conversion member, a plurality of second inclined guide portions are provided at the upper edge of the flange, a linkage portion corresponding to the second inclined guide portion is provided on the lower edge of the gear shift member, when the self-locking button is pressed by external force, the gear shift member contacts the second inclined guide portion through the linkage portion to push down the position conversion member, and drives the position conversion member to rotate, so that the gear block on the position conversion member enters the next gear position from the previous gear position along the first inclined guide portion.

[0014] A further preferred technical solution of the utility model is: the self-locking pin is located below the position conversion member and accommodated in the connecting channel, the bottom of the position conversion member has a second slot for the upper end of the self-locking pin to be inserted, the upper end of the self-locking pin is inserted in the second slot, the middle part of the self-locking pin is provided with an outer ring edge, the outer ring edge abuts against the bottom of the position conversion member, the elastic reset member is a reset spring sleeved on the self-locking pin, one end of the reset spring abuts against the connecting seat, and the other end abuts against the outer ring edge, the reset spring acts on the outer ring edge and has an elastic force to push the self-locking pin and the position conversion member to move up and reset, the bottom of the connecting seat is provided with an extension port for the lower end of the self-locking pin to extend out, when in the unlocked position, the self-locking pin is completely stored in the connecting seat, and when in the locked position, the lower end of the self-locking pin protrudes from the bottom of the connecting seat.

[0015] A further preferred technical solution of the utility model is that the switch button moves linearly after being pressed, and the moving direction of the switch button is perpendicular to the moving direction of the self-locking pin.

[0016] A further preferred technical solution of the utility model is: the switch assembly includes a push-type control switch fixed on the housing, the control switch is provided with an elastic and retractable trigger rod, and the switch button is connected to the trigger rod.

[0017] Compared with the prior art, the utility model has the advantages that a self-locking component is provided on the housing, the self-locking component includes a self-locking button, a shifting member connected to the self-locking button, a connecting seat fixed on the housing and having multiple gears, a position conversion member and an elastic reset member that cooperate with the shifting member in linkage, a first inclined guide portion is provided between adjacent gears on the connecting seat, a self-locking pin is connected to the position conversion member, the elastic reset member has an elastic force that pushes the self-locking pin and the position conversion member to move and reset, and when the self-locking button is pressed by an external force, the shifting member pushes down the position conversion member and drives the position conversion member The part rotates, causing the position conversion part to rotate onto the first inclined guide portion and enter different gears along the first inclined guide portion, thereby causing the self-locking pin to move up and down and switch between the unlocking position and the locking position. The gear in which the position conversion part is engaged is changed by pressing the self-locking button, thereby switching the position of the self-locking pin. When the self-locking pin moves and switches to the locking position and the switch button is not pressed, the self-locking pin blocks the pressing stroke of the switch button to limit the switch button from being pressed, thereby achieving self-locking and preventing the operator from accidentally touching the switch button to start the machine during the power-on process of the electric hammer or electric pick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model in unlocked state;

[0020] Figure 2 It is a cutaway schematic diagram of the utility model in the unlocked state;

[0021] Figure 3 is a cross-sectional schematic diagram of the self-locking component in the unlocked state;

[0022] Figure 4 This is a schematic diagram of the overall structure of the utility model in the first self-locking state;

[0023] Figure 5 It is a cutaway schematic diagram of the utility model in the first self-locking state;

[0024] Figure 6 It is a schematic diagram of the overall structure of the utility model in the second self-locking state;

[0025] Figure 7 It is a cutaway schematic diagram of the utility model in the second self-locking state;

[0026] Figure 8 It is a cross-sectional schematic diagram of the self-locking component in the self-locking state;

[0027] Fig. 9 It is an exploded view of the self-locking component;

[0028] Fig.10 is a cutaway schematic diagram of a connecting seat;

[0029] Fig.11 A schematic diagram of the connection between the shift member and the position conversion member;

[0030] Fig.12 A schematic diagram of the structure of the switch assembly.

[0031] In the figure: 1, housing; 2, self-locking button; 3, switch button; 4, control switch; 5, trigger rod; 6, first embedded groove; 7, opening; 8, shift member; 9, insertion port; 10, connecting seat; 11, position conversion member; 12, self-locking pin; 13, second embedded groove; 14, return spring; 15, connecting groove; 16, connecting rod; 17, annular groove; 18, annular convex part; 19, first slot; 20, limit convex block; 21, card Groove; 22, upper bottom; 23, gear block; 24, second slot; 25, outer ring edge; 26, extension port; 27, connecting channel; 28, limit hole; 29, second gear; 30, flange; 31, upper shell; 32, connecting sleeve; 33, lower cover; 34, gear convex block; 35, guide tooth; 36, first inclined guide part; 37, linkage part; 38, second inclined guide part; 39, first serration; 40, second serration. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0033] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0034] Figure 1-Figure 12 As shown, the self-locking structure of the electric hammer includes a housing 1 and a switch assembly arranged on the housing 1 and triggered by pressing. The switch assembly includes a switch button 3 for being pressed by a hand, and the switch button 3 is reset after the pressing force disappears.

[0035] Fig.12As shown, the switch assembly is a conventional push-type control switch 4 on an existing electric hammer and electric pick. After the switch assembly is pressed, the pressing hand is released and the switch assembly automatically resets, such as the brand Ruiyi, model DCKAIG electric hammer / electric pick power switch. Preferably, the switch assembly includes a push-type control switch 4 fixed to the housing 1, and an elastically retractable trigger rod 5 is provided on the control switch 4. The switch button 3 is connected to the trigger rod 5. When the switch button 3 is pressed, the trigger rod 5 is pressed simultaneously with the switch button 3, triggering the control switch 4, the control switch 4 is turned on, and the machine is started. When the pressed switch button 3 is released, the trigger rod 5 and the switch button 3 are reset, the control switch 4 is turned off, and the machine stops.

[0036] The housing 1 is provided with a first embedding groove 6 , and the control switch 4 is inserted and embedded in the first embedding groove 6 and fixed.

[0037] The switch button 3 moves linearly relative to the housing 1 after being pressed.

[0038] Figure 1 , Fig. 9 As shown, a self-locking component is provided on the housing 1, and the self-locking component includes a self-locking button 2, a shifting member 8 connected to the self-locking button 2, a connecting seat 10 fixed on the housing 1 and having multiple gears, a position conversion member 11 and an elastic reset member that cooperates with the shifting member 8. A first inclined guide portion 36 is provided between adjacent gears on the connecting seat 10, a self-locking pin 12 is connected to the position conversion member 11, and the elastic reset member has an elastic force that pushes the self-locking pin 12 and the position conversion member 11 to move and reset. When the self-locking button 2 is pressed by an external force, the shifting member 8 pushes down the position conversion member 11 and drives the position conversion member 11 to rotate. The position conversion member 11 rotates to the first inclined guide portion 36, and the position conversion member 11 enters different gears along the first inclined guide portion 36, so that the self-locking pin 12 moves up and down to switch between the unlocking position and the locking position.

[0039] The position conversion member 11 moves up and down and rotates under the interaction of the shift member 8 and the elastic return member to achieve the shifting of the gear position.

[0040] Fig.10 As shown, the gear position includes a plurality of first gear positions and second gear positions 29 arranged in a circle, a second gear position 29 is provided between two adjacent first gear positions, and a first inclined guide portion 36 for guiding the position conversion member 11 is provided between adjacent first gear positions and second gear positions 29. When the position conversion member 11 enters the first gear position, the self-locking pin 12 moves up to the unlocking position, and when the position conversion member 11 enters the second gear position 29, the self-locking pin 12 moves down to the locking position.

[0041] Figure 3 , Figure 8 As shown, the self-locking button 2, the shift member 8, the position conversion member 11 and the self-locking pin 12 are arranged in sequence from top to bottom.

[0042] Figure 3 , Figure 8 , Fig.10 As shown, preferably, a connecting channel 27 is provided in the connecting seat 10, and a plurality of gear protrusions 34 are provided on the inner peripheral side wall of the connecting channel 27 at equal intervals, and a vertical slot 21 with an opening downward is formed between adjacent gear protrusions 34, and the vertical slot 21 is used as the first gear. The lower edge of the gear protrusion 34 is provided with two guide teeth 35 with a first inclined guide portion 36, and a second gear 29 is formed between the two guide teeth 35. The position conversion member 11 can be movably accommodated in the connecting channel 27 and is clamped in the first gear or the second gear 29. The position of the first gear for the position conversion member 11 to be clamped and the position of the second gear 29 for the position conversion member 11 to be clamped have a spacing in the direction in which the position conversion member 11 moves up and down, so that when the position conversion member 11 jumps between the first gear and the second gear 29, the self-locking pin 12 moves and switches between the locking position and the unlocking position, and one end of the shift member 8 is inserted in the connecting channel 27 for pushing down the position conversion member 11 for shifting gears.

[0043] One inclined side of the guide tooth 35 serves as a first inclined guide portion 36 .

[0044] The above-mentioned slot 21 has an upper bottom 22, and the circumference of the lower end of the shift member 8 is provided with a limiting protrusion 20 corresponding to each slot 21, and the top of the connecting seat 10 is provided with an insertion port 9 for the lower end of the shift member 8 to be inserted into the connecting channel 27. The lower end of the shift member 8 is inserted into the connecting channel 27 and the limiting protrusion 20 is stuck in the corresponding slot 21. The limiting protrusion 20 can slide up and down along the slot 21. The shift member 8 is restricted to move up and down in a straight line through the cooperation between the limiting protrusion 20 and the slot 21, and the upper bottom 22 of the slot 21 blocks the limiting protrusion 20 above to restrict the lower end of the shift member 8 from upwardly detaching from the insertion port 9 from the connecting channel 27, so that the lower end of the shift member 8 is connected in the connecting seat 10 and linked with the position conversion member 11.

[0045] A connecting groove 15 is provided at the bottom of the self-locking button 2, and the upper end of the shift member 8 is inserted into the connecting groove 15 and connected to the self-locking button 2. Specifically, an annular groove 17 is provided on the inner side wall of the connecting groove 15, and a connecting rod 16 extending upward is provided on the upper end of the self-locking pin 12, and an annular convex portion 18 is provided on the side wall of the connecting rod 16. When the connecting rod 16 is inserted into the connecting groove 15, the connecting rod 16 and the groove wall of the connecting groove 15 are squeezed and elastically deformed, so that the annular convex portion 18 is stuck in the annular groove 17, and the connecting rod 16 is restricted from being separated from the connecting groove 15. A first rotation-limiting plane is provided on the side wall of the connecting rod 16, and a second rotation-limiting plane is provided on the groove wall of the connecting groove 15. The first rotation-limiting plane and the second rotation-limiting plane are fitted to restrict the relative rotation of the connecting rod 16 and the self-locking button 2.

[0046] The housing 1 is provided with an opening 7 through which the self-locking button 2 is extended for being pressed by hand.

[0047] The position conversion member 11 has a gear block 23 on its circumference for locking into the first gear or the second gear 29. After the self-locking button 2 is pressed, the shift member 8 pushes down the position conversion member 11 and drives the position conversion member 11 to rotate, causing the gear block 23 to jump between the first gear and the second gear 29 to adjust the position of the self-locking pin 12.

[0048] A first slot 19 for inserting the position conversion member 11 is provided at the bottom of the shift member 8, a flange 30 is provided at the lower end of the position conversion member 11, a plurality of second inclined guide portions 38 are provided at the upper edge of the flange 30, and a linkage portion 37 corresponding to the second inclined guide portion 38 is provided on the lower edge of the shift member 8. The position conversion member 11 is inserted into the first slot 19, and the linkage portion 37 on the lower edge of the shift member 8 is opposite to the second inclined guide portion 38 on the flange 30. When the self-locking button 2 is pressed by an external force, the shift member 8 pushes down the position conversion member 11 through the contact between the linkage portion 37 and the second inclined guide portion 38, and drives the position conversion member 11 to rotate, so that the gear block 23 on the position conversion member 11 enters the next gear from the previous gear along the first inclined guide portion 36.

[0049] Fig. 9 , Fig.11 As shown, preferably, a circle of annular first saw teeth 39 is provided on the upper edge of the flange 30, and a side bevel of the first saw teeth 39 serves as a second inclined guide portion 38. A circle of annular second saw teeth 40 is provided on the lower edge of the shift member 8, and a side bevel of the second saw teeth 40 serves as a linkage portion 37 and is opposite to the second inclined guide portion 38 below. The bevel on a single second saw tooth 40 corresponds to the second inclined guide portion 38 on a single first saw tooth 39 one by one. When the shift member 8 pushes the position conversion member 11 down until the gear block 23 moves out of the first gear position or the second gear position 29, The linkage part 37 pushes the position conversion member 11 along the second inclined guide part 38, so that the position conversion member 11 and the gear block 23 rotate, and the gear block 23 rotates to the first inclined guide part 36 and enters the next gear along the first inclined guide part 36. When the gear block 23 is stuck in the first gear or the second gear 29, there is a second inclined guide part 38 opposite to it below the upper linkage part 37, so that when the shift member 8 is pushed down, the second inclined guide part 38 can be pushed by the linkage part 37 to rotate and shift the position conversion member 11 and the gear block 23.

[0050] The gear block 23 is arranged on the outer wall of the flange 30, and the gear block 23 is adjacent to the first serration 39, the upper edge of the gear block 23 is flush with the second inclined guide portion 38, the limiting protrusion 20 is adjacent to the second serration 40, and the lower edge of the limiting protrusion 20 is flush with the second serration 40 for pressing down the hypotenuse of the second inclined guide portion 38.

[0051] The self-locking pin 12 is accommodated in the connecting channel 27, and the bottom of the position conversion member 11 has a second slot 24 for the upper end of the self-locking pin 12 to be inserted, and the upper end of the self-locking pin 12 is inserted in the second slot 24. The middle part of the self-locking pin 12 is provided with an outer ring edge 25, and the outer ring edge 25 abuts against the bottom of the position conversion member 11. The elastic reset member is a reset spring 14 sleeved on the self-locking pin 12, and the reset spring 14 acts on the outer ring edge 25 and has an elastic force to push the self-locking pin 12 and the position conversion member 11 to move up and reset. The bottom of the connecting seat 10 is provided with an extension port 26 for the lower end of the self-locking pin 12 to extend out. When in the unlocking position, the self-locking pin 12 is completely stored in the connecting seat 10. When in the locking position, the lower end of the self-locking pin 12 extends out from the extension port 26 and protrudes from the bottom of the connecting seat 10. Through the elastic force of the reset spring 14, the self-locking pin 12 and the position conversion member 11 move up and down synchronously in the connecting channel 27.

[0052] The connecting seat 10 includes an upper shell 31 and a lower cover 33. The upper shell 31 is provided with a connecting sleeve 32. The connecting channel 27 is axially arranged in the connecting sleeve 32. The top of the upper shell 31 is provided with the above-mentioned insertion port 9 which is connected with the upper end of the connecting channel 27. The lower cover 33 is connected to the bottom of the upper shell 31, and the lower cover 33 is provided with the above-mentioned extension port 26 which is connected with the lower end of the connecting channel 27.

[0053] Preferably, the lower cover 33 is snap-connected to the bottom of the upper shell 31 .

[0054] The housing 1 is provided with a second embedding groove 13 , and the connecting seat 10 is inserted into the second embedding groove 13 and fixed to the housing 1 .

[0055] Preferably, four gear protrusions 34 are evenly spaced on the inner side wall of the connecting channel 27, and the four gear protrusions 34 are arranged in a ring array on the inner side wall of the connecting channel 27 to form four evenly spaced slots 21 on the connecting channel 27, and a second gear position 29 is provided between adjacent slots 21. Four limit protrusions 20 are evenly spaced on the outer side wall of the shift member 8, and each limit protrusion 20 is stuck in a corresponding slot 21 and slides up and down. Four gear blocks 23 are evenly spaced on the outer side wall of the flange 30, and the four gear blocks 23 are respectively stuck in the four slots 21, or the four gear blocks 23 are respectively stuck in the four second gear positions 29.

[0056] Fig.10As shown, since the first gear position is formed by two adjacent gear position protrusions 34 enclosing the slot 21, and the second gear position 29 is enclosed by two guide teeth 35 on the lower edge of the gear position protrusion 34, the first gear position and the second gear position 29 have a height difference, and the first gear position is higher than the second gear position 29. When the position conversion member 11 moves up and is stuck in the first gear position, the self-locking pin 12 moves up synchronously with the position conversion member 11, so that the self-locking pin 12 is in the unlocking position. When the position conversion member 11 moves down and is stuck in the second gear position 29, the self-locking pin 12 moves down synchronously with the position conversion member 11, so that the self-locking pin 12 moves down from the unlocking position to the locking position.

[0057] Figure 1-Figure 3 As shown, when the four gear clamping blocks 23 are respectively clamped in the four clamping slots 21, the gear clamping blocks 23 abut against the limiting protrusions 20 clamped in the clamping slots 21 above. At this time, the gear clamping blocks 23 are clamped in the first gear position, and the self-locking pin 12 is in the unlocking position. The self-locking pin 12 is completely stored in the connecting seat 10. Figure 4-Figure 8 As shown, the user presses the self-locking button 2, and the shift member 8 pushes the position conversion member 11 up and down through the linkage portion 37 against the second inclined guide portion 38, so that the position conversion member 11 moves downward. When the gear block 23 moves down out of the slot 21, the linkage portion 37 pushes the position conversion member 11 to rotate during the process of pushing down along the second inclined guide portion 38, and the gear block 23 rotates to the first inclined guide portion 36. Under the elastic force of the reset spring 14, the position conversion member 11 and the self-locking pin 12 make the gear block 23 enter the second gear position 29 of the next level along the first inclined guide portion 36. At this time, the gear block 23 is stuck on the second gear position 29, so that the self-locking pin 12 moves down to the locked position, and the lower end extends out of the extension port 26. The user presses the self-locking button 2 again, and the shift member 8 pushes the position conversion member 11 up and down through the linkage portion 37 against the second inclined guide portion 38. The shift piece 11 is replaced, causing the position conversion piece 11 to move downward. When the gear block 23 moves down out of the second gear position 29, the linkage part 37 pushes the position conversion piece 11 to rotate during the process of pushing down along the second inclined guide part 38, and the gear block 23 rotates to the first inclined guide part 36. Under the elastic force of the position conversion piece 11 and the self-locking pin 12 pushing up by the reset spring 14, the gear block 23 enters the first gear position of the next level along the first inclined guide part 36. At this time, the gear block 23 is stuck in the slot 21 and abuts against the upper limiting protrusion 20, so that the self-locking pin 12 moves up to the unlocking position. Every time the user presses the button, the gear block 23 on the position conversion piece 11 jumps once, and the gear block 23 jumps to the next gear position. During the repeated pressing of the self-locking button 2, the position conversion piece 11 always rotates step by step clockwise or counterclockwise.

[0058] Figure 4 , Figure 5As shown, in the first self-locking state, the self-locking pin 12 moves and switches to the locking position, and the switch button 3 is not pressed. The self-locking pin 12 blocks the pressing stroke of the switch button 3 to limit the switch button 3 from being pressed, thereby achieving self-locking and preventing the operator from accidentally touching the switch button 3 to start the machine during the power-on process of the electric hammer or electric pick.

[0059] When the switch button 3 is in a natural state without being pressed, press the self-locking button 2 once, the self-locking pin 12 moves down to the locked position, and the self-locking pin 12 blocks the pressing stroke of the switch button 3 to limit the switch button 3 from being pressed, forming a self-locking state, so that the machine cannot be started. Press the self-locking button 2 once again, the self-locking pin 12 moves up to the unlocked position, and the lower end of the self-locking pin 12 moves away from the pressing stroke of the switch button 3, releasing the restriction on the switch button 3. At this time, the switch button 3 can be pressed to start the machine.

[0060] Preferably, the moving direction of the switch button 3 is perpendicular to the moving direction of the self-locking pin 12 .

[0061] Figure 6 , Figure 7 As shown, the patent also has a second self-locking state, and a limit hole 28 is provided on the switch button 3. In the second self-locking state, the self-locking pin 12 moves to the locking position, and the switch button 3 is pressed, and the self-locking pin 12 is inserted into the limit hole 28 on the switch button 3 to limit the switch button 3 from resetting.

[0062] First, press the switch button 3 to start the machine. At this time, the limit hole 28 is opposite to the upper extension opening 26. Then press the self-locking button 2 once, the self-locking pin 12 moves down to the locked position, and the self-locking pin 12 extends out of the extension opening 26 and is inserted into the limit hole 28, forming a self-locking state, limiting the reset of the switch button 3, so that the machine remains in a state of continuous operation. There is no need for the operator to press the switch button 3 all the time to keep it started, and the operation is more labor-saving. Press the self-locking button 2 once again, the self-locking pin 12 moves up to the unlocked position, and the lower end of the self-locking pin 12 moves out of the limit hole 28, releasing the restriction on the switch button 3. At this time, the switch button 3 is reset to stop the machine.

[0063] This structure is not only applicable to electric hammers, but also to electric picks and other electric tools.

[0064] The self-locking structure of the electric hammer provided by the utility model is introduced above. The principle and implementation method of the utility model are explained in this article using specific examples. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A self-locking structure of an electric hammer, comprising a housing, a switch assembly arranged on the housing and triggered by pressing, the switch assembly comprising a switch button for hand pressing, the switch button resets after the pressing force disappears, characterized in that: The housing is provided with a self-locking assembly, which includes a self-locking button, a shifting member connected to the self-locking button, a connecting seat fixed to the housing and having multiple gears, a position conversion member and an elastic reset member that cooperate with the shifting member in linkage, a first inclined guide portion is provided between adjacent gears on the connecting seat, a self-locking pin is connected to the position conversion member, and the elastic reset member has an elastic force that pushes the self-locking pin and the position conversion member to move and reset, when the self-locking button is pressed by an external force, the shifting member pushes down the position conversion member and drives the position conversion member to rotate, the position conversion member enters different gears along the first inclined guide portion, so that the self-locking pin moves up and down and switches between the unlocking position and the locking position, In the first self-locking state, the self-locking pin moves and switches to the locking position, and the switch button is not pressed, and the self-locking pin blocks the pressing stroke of the switch button to limit the switch button from being pressed.

2. The self-locking structure of the electric hammer according to claim 1 is characterized in that: The switch button is provided with a limiting hole. In the second self-locking state, the self-locking pin moves and switches to the locking position, and the switch button is pressed, and the self-locking pin is inserted into the limiting hole on the switch button to limit the switch button from resetting.

3. The self-locking structure of the electric hammer according to claim 1 or 2, characterized in that: The gear positions include a plurality of first gear positions and second gear positions arranged in a circle, a second gear position being provided between two adjacent first gear positions, and a first inclined guide portion for guiding a position conversion member being provided between adjacent first gear positions and second gear positions. When the position conversion member enters the first gear position, the self-locking pin moves upward to an unlocking position, and when the position conversion member enters the second gear position, the self-locking pin moves downward to a locking position.

4. The self-locking structure of the electric hammer according to claim 3 is characterized in that: A connecting channel is provided in the connecting seat, and a plurality of gear protrusions are provided on the inner peripheral side wall of the connecting channel at equal intervals, and a vertical slot opening downward is formed between adjacent gear protrusions, and the vertical slot is used as the first gear. Two guide teeth with a first inclined guide portion are provided on the lower edge of the gear protrusion, and the second gear is formed between the two guide teeth. The position conversion member can be movably accommodated in the connecting channel and is clamped in the first gear or the second gear. The position of the first gear for the position conversion member to be clamped and the position of the second gear for the position conversion member to be clamped have a spacing in the direction of the position conversion member moving up and down, and one end of the gear shift member is inserted in the connecting channel for pushing the position conversion member down to shift gears.

5. The self-locking structure of the electric hammer according to claim 4, characterized in that: The slot has an upper bottom, and the lower end of the shift member is circumferentially provided with limiting protrusions corresponding to each slot, and the top of the connecting seat is provided with an insertion port for the lower end of the shift member to be inserted into the connecting channel, the lower end of the shift member is inserted into the connecting channel and the limiting protrusion is stuck in the corresponding slot, and the limiting protrusion can slide up and down along the slot.

6. The self-locking structure of the electric hammer according to claim 4, characterized in that: The circumference of the position conversion member has a gear block for locking into the first gear or the second gear.

7. The self-locking structure of the electric hammer according to claim 6, characterized in that: The position conversion member is located below the shift member, a first slot for inserting the position conversion member is provided at the bottom of the shift member, a flange is provided at the lower end of the position conversion member, a plurality of second inclined guide portions are provided at the upper edge of the flange, a linkage portion corresponding to the second inclined guide portion is provided on the lower edge of the shift member, when the self-locking button is pressed by external force, the shift member contacts the second inclined guide portion through the linkage portion to push down the position conversion member, and drives the position conversion member to rotate, so that the gear block on the position conversion member enters the next gear position from the previous gear position along the first inclined guide portion.

8. The self-locking structure of the electric hammer according to claim 4, characterized in that: The self-locking pin is located below the position conversion member and accommodated in the connecting channel. The bottom of the position conversion member has a second slot for inserting the upper end of the self-locking pin, and the upper end of the self-locking pin is inserted in the second slot. The middle part of the self-locking pin is provided with an outer ring edge, and the outer ring edge abuts against the bottom of the position conversion member. The elastic reset member is a reset spring sleeved on the self-locking pin, one end of the reset spring abuts against the connecting seat, and the other end abuts against the outer ring edge. The reset spring acts on the outer ring edge and has an elastic force to push the self-locking pin and the position conversion member to move up and reset. The bottom of the connecting seat is provided with an extension port for the lower end of the self-locking pin to extend out. When in the unlocked position, the self-locking pin is completely stored in the connecting seat, and when in the locked position, the lower end of the self-locking pin protrudes from the bottom of the connecting seat.

9. The self-locking structure of an electric hammer according to claim 1, characterized in that: The switch button moves linearly after being pressed, and the moving direction of the switch button is perpendicular to the moving direction of the self-locking pin.

10. The self-locking structure of the electric hammer according to claim 9, characterized in that: The switch assembly comprises a push-type control switch fixed on the housing, the control switch is provided with an elastic and retractable trigger rod, and the switch button is connected to the trigger rod.

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