CN112792790A - Safety tripping clutch and electric hammer - Google Patents
Safety tripping clutch and electric hammer Download PDFInfo
- Publication number
- CN112792790A CN112792790A CN201911106766.7A CN201911106766A CN112792790A CN 112792790 A CN112792790 A CN 112792790A CN 201911106766 A CN201911106766 A CN 201911106766A CN 112792790 A CN112792790 A CN 112792790A
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- China
- Prior art keywords
- wheel
- clutch
- wheel core
- ball head
- head guide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/003—Clutches specially adapted therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
The invention discloses a safety tripping clutch which comprises a wheel core, a second wheel, ball head guide pillars and a tripping spring, wherein the wheel core is rotatably arranged in the second wheel, the ball head guide pillars are arranged along the radial direction of the wheel core and are distributed along the circumferential direction of the wheel core, the tripping spring is sleeved at the tail ends of cylinder bodies of the ball head guide pillars, the front ends of the ball head guide pillars are abutted against the inner wall of the second wheel, and when the second wheel drives the wheel core to rotate, the wheel core drives a drilling gear clutch plate to rotate through a connecting plate. According to the safe tripping clutch provided by the invention, the original hard connection transmission mode of the steel ball and the short cylinder of the tripping clutch is set as the soft connection transmission mode of the ball head guide post and the tripping spring, and the short cylinder is replaced by the ball head guide post, so that the structure occupies smaller wheel core space of a second wheel, the space structure of the clutch in the electric hammer is optimized, and the occupied space of the electric hammer gear box is reduced.
Description
Technical Field
The invention relates to the technical field of electric tools, in particular to a safety tripping clutch and an electric hammer.
Background
With the development of society, the building industry develops rapidly, and in the building industry field, the electric hammer is widely used, mainly used for drilling on concrete, floor, brick wall and stone.
In the working structure of the current electric hammer, a motor drives a second wheel to rotate, a steel ball is arranged in the second wheel, the steel ball is connected with a short cylinder, the second wheel drives a wheel core to rotate through the steel ball and the short cylinder, the wheel core drives a drill blocking clutch to work through being connected with a connecting plate, and the drill blocking clutch realizes the rotary output of small bevel gears through driving flat keys on the small bevel gears. However, in the existing electric hammer clutch structure, energy is transferred through the steel ball and the short cylinder, and the short cylinder and the steel ball structure occupy a very large internal space of the second wheel, so that the design size of the second wheel is large; in addition, the short cylinder and the steel ball are in hard connection, so that the centering problem after actual abrasion exists, the tripping torque value is influenced, the torque value is unbalanced, and the normal use of the electric hammer is influenced.
Therefore, how to optimize the structure of the clutch inside the electric hammer is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a safety tripping clutch, which greatly reduces the design and processing size of a second wheel and optimizes the internal clutch structure of an electric hammer by changing the hard connection mode of a steel ball and a short cylinder.
In order to solve the technical problems, the invention provides a safety tripping clutch and an electric hammer, which comprise a wheel core, a second wheel, ball head guide pillars and a tripping spring, wherein the wheel core is rotatably arranged in the second wheel, the ball head guide pillars are arranged along the radial direction of the wheel core and are circumferentially distributed along the wheel core, the tripping spring is sleeved at the tail end of a column body of the ball head guide pillars, the front end of each ball head guide pillar is abutted against the inner wall of the second wheel, and the wheel core is driven to rotate by the ball head guide pillars when the second wheel rotates, so that the ball head guide pillars compress the tripping spring to enable the wheel core and the second wheel to rotate relatively when the wheel core is subjected to certain rotation resistance.
Preferably, the number of the ball head guide posts is at least 3, and the ball head guide posts are uniformly distributed along the circumferential direction of the wheel core.
Preferably, the bottom of the wheel core is provided with a cylindrical boss which is matched and positioned with the stepped hole of the second wheel.
Preferably, the wheel core upper end cover is provided with a large gasket for limiting the outward turning of the tripping spring.
The invention provides an electric hammer, which comprises a motor, a safety release clutch, a drilling gear clutch plate and a connecting plate, wherein the safety release clutch, the drilling gear clutch plate and the connecting plate are connected with the motor, a connecting bulge is arranged at the bottom of a wheel core of the safety release clutch, and a mounting hole in clamping fit with the connecting bulge is arranged on the connecting plate.
Preferably, be provided with 2 at least bosss on the brill shelves clutch piece, be provided with on the connecting plate with boss joint complex recess.
Preferably, the drill gear clutch plate is mounted on the small bevel gear through a flat key.
Preferably, the small bevel gear is sleeved with a first bearing and a bearing gasket which are connected with the safety tripping clutch.
Preferably, the clutch device further comprises a second bearing arranged below the drill gear clutch plate and a clutch spring arranged between the drill gear clutch plate and the second bearing.
Preferably, the drill gear clutch plate locking device further comprises a shifting plate in press-hold fit with the drill gear clutch plate and a stop plate capable of meshing with the external teeth of the drill gear clutch plate.
Preferably, the positioning device further comprises a positioning pin for mounting the shifting piece and the stop piece, and a stop piece spring is abutted to the bottom of the stop piece.
The invention provides a safety tripping clutch and an electric hammer, which mainly comprise a wheel core, a second wheel, a ball head guide pillar and a tripping spring, wherein the wheel core is rotatably arranged in the second wheel, the ball head guide pillar is installed along the radial direction of the wheel core and is circumferentially distributed along the wheel core, the tripping spring is sleeved at the tail end of a column body of the ball head guide pillar, the front end of the ball head guide pillar is abutted against the inner wall of the second wheel, the wheel core is driven to rotate by the ball head guide pillar when the second wheel rotates, so that the ball head guide pillar compresses the tripping spring to enable the wheel core and the second wheel to relatively rotate under the condition that the wheel core is subjected to certain rotation resistance. According to the safe tripping clutch provided by the invention, the original hard connection transmission mode of the steel ball and the short cylinder of the tripping clutch is set as the soft connection transmission mode of the ball head guide post and the tripping spring, and the short cylinder is replaced by the ball head guide post, so that the structure occupies smaller wheel core space of a second wheel, the space structure of the clutch in the electric hammer is optimized, and the occupied space of the electric hammer gear box is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is an isometric exploded view of an overall construction according to one embodiment of the present invention;
FIG. 3 is a cross-sectional view of the overall structure of one embodiment of the present invention;
fig. 4 is a schematic overall structure diagram of another embodiment of the present invention.
Wherein, in fig. 1-4:
the gear-type clutch comprises a wheel core-1, a second wheel-2, a ball guide post-3, a tripping spring-4, a drilling gear clutch plate-5, a connecting plate-6, a small bevel gear-7, a flat key-8, a bearing-9, a bearing gasket-10, a large gasket-11, a second bearing-12, a clutch spring-13, a shifting plate-14, a stop plate-15, a positioning pin-16, a stop plate spring-17 and an inner knob-18.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, fig. 1 is a schematic overall structure diagram of an embodiment of the present invention; FIG. 2 is an isometric exploded view of an overall construction according to one embodiment of the present invention; fig. 3 is an overall structural sectional view of an embodiment of the present invention.
In a specific embodiment provided by the invention, the safety tripping clutch mainly comprises a wheel core 1, a second wheel 2 sleeved on the periphery of the wheel core 1, a ball head guide pillar 3 arranged on the circumference of the wheel core 1 and a tripping spring 4 arranged on the column body of the ball head guide pillar 3, wherein the front end of the ball head guide pillar 3 is abutted against the inner wall of the second wheel 2.
The second wheel 2 is driven to rotate by the motor, and the second wheel 2 drives the wheel core 1 to rotate by the ball guide post 3 when rotating, so that the wheel core 1 compresses the tripping spring 4 to enable the wheel core 1 and the second wheel 2 to rotate relatively under the condition that the wheel core 1 is subjected to certain rotation resistance. Because the trip spring 4 sets up in 3 shaft bodys of bulb guide pillar, bulb guide pillar 3 is used for driving wheel core 1 rotation of trip spring 4 tip through reaction force, and wheel core 1 is used for driving connecting plate 6 and is the punching press board work promptly, and connecting plate 6 is used for driving flat key 8 and then drive little awl tooth 7 and carry out rotatory work through meshing brill shelves separation and reunion piece 5.
Specifically, in the practical application process, the motor drives the second wheel 2 to rotate, the second wheel 2 drives the ball head guide pillar 3 and the second wheel 2 to synchronously rotate in the rotating process, specifically, the ball head guide pillar 3 enables the spherical surface at the front end of the ball head guide pillar 3 to abut against the inner concave surface of the second wheel 2 through the reaction force of the trip spring 4 to synchronously rotate with the second wheel 2, so that the ball head guide pillar 3 drives the positioning trip spring 4 and the wheel core 1 of the ball head guide pillar 3 to synchronously rotate, the wheel core 1 drives the drilling gear clutch plate 5 to move, and when the drilling gear clutch plate 5 is meshed with the connecting plate 6, the drilling gear clutch plate 5 realizes the rotary output of the small bevel gear 7; when the drill gear clutch plate 5 overcomes the elasticity of the clutch spring 13 under the pressing of the poking plate 14, the second wheel 2, the ball head guide post 3, the tripping spring 4, the wheel core 1 and the connecting plate 6 jointly form the idle running of the tripping clutch on the small bevel gear 7 shaft.
It should be noted that the wheel core 1 can be a powder metallurgy part or a cold extrusion part, the boss at the bottom of the wheel core 1 is connected with the connecting plate 6, the connecting plate 6 is a stamping plate, in order to solve the problem that when the wheel core 1 is formed by powder metallurgy pressing, the connecting plate 6 is connected with the boss of the wheel core 1 in a static fit manner, the drill stop clutch plate 5 is in a movable fit with the connecting plate 6 in the transmission process, the side wall of the connecting plate 6 needs to bear repeated impact force at the moment of starting and stopping of the machine, so that the connecting plate 6 and the wheel core 1 are in a separation structure, the problem that the powder metallurgy part is poor in durability and service life when bearing the impact force can be effectively solved, the wheel core 1 and the connecting plate 6 can also be in an integrated structure, and the second wheel 2, the ball guide pillar 3, the trip spring 4, the wheel core 1 and the connecting plate 6 jointly form.
In order to optimize the safety release clutch in the above embodiment, the number of the ball guide posts 3 is at least 3, and the ball guide posts 3 are uniformly distributed along the circumferential direction of the wheel core 1. In the middle of the practical application process, the output of electric hammer carries out energy transmission through transmission structure and carries out the output, therefore, stable transmission of motor energy has very important the most use, and the first energy transmission of motor drives bulb guide pillar 3 through No. two wheels 2 and carries out the transmission, consequently, bulb guide pillar 3's atress homogeneity and stability are very important, set up bulb guide pillar 3's quantity to at least 3, and evenly set up bulb guide pillar 3 along 1 circumference of wheel core, this just makes No. two wheels 2 can carry out comparatively even effort to bulb guide pillar 3, the spring centering effect of tripping spring 4 has been guaranteed, it is that the energy transmits wheel core 1 more steadily, connecting plate 6 and drilling shelves clutch disc 5 and reach the output, the result of use of electric hammer has been guaranteed. It should be noted that the number of the ball stud 3 may also be other numbers, for example, 6 or 9, so as to ensure the rotation transmission effect, and is not specifically limited herein.
Simultaneously, the bottom of wheel core 1 is provided with the ladder hole cooperation location of cylinder boss and No. 2 wheels, so makes No. two wheels can not produce certain circumference drunkenness. Of course, the upper end cover of the wheel core 1 is provided with a large pad 11 for limiting the outward turning of the trip spring 4 after being stressed, and the large pad 11 and the second wheel 2 form an installation space, so that the trip spring 4 is prevented from displacement.
Referring to fig. 4, fig. 4 is a schematic overall structure diagram of another embodiment of the present invention.
Of course, the mounting holes for mounting the tripping spring 4 in the wheel core 1 can be distributed in a non-radial manner, that is, the mounting holes and the center of the wheel core 1 are spirally distributed, the tripping spring 4 can further reduce the required mounting space, and further, the required mounting space after the ball head guide pillar 3 and the tripping spring 4 are assembled is optimized.
The invention also provides an electric hammer, which comprises a motor; the safety tripping device comprises a wheel core 1, a wheel core 6 and a safety tripping clutch, and is characterized by further comprising a safety tripping clutch, a drilling gear clutch plate 5 and a connecting plate 6 which are connected with a motor, wherein a connecting bulge is arranged at the bottom of the wheel core, and a mounting hole which is matched with the connecting bulge in a clamping mode is formed in the connecting plate 6. The safety trip clutch is the safety trip clutch disclosed in the above embodiments, and details are not described here.
It should be noted that the bottom of the wheel core 1 is provided with a connecting protrusion, and the connecting plate 6 is provided with a mounting hole in clamping fit with the connecting protrusion. In the middle of the practical application process, the beginning and the stop working process of the small bevel gear 7 of the electric hammer all pass through the transmission of the wheel core 1 and the connecting plate 6, when the working state is started, the connecting plate 6 is driven by the wheel core 1, the small bevel gear 7 is driven by the rotation action, when the working state is stopped, the conditions are just opposite, but the starting and the stop working states all pass through the wheel core 1 and the connecting plate 6, therefore, the connection transmission effect of the wheel core 1 and the connecting plate 6 is important, the connecting bulge is arranged at the bottom of the wheel core 1, the connecting plate 6 is provided with the mounting hole matched with the clamping of the connecting bulge, the wheel core 1 is connected with the connecting plate 6, the rigid connection is realized, the transmission effect of the rotation energy can be ensured, the instant speed of the working state conversion can be ensured, and the conversion of the working state.
Furthermore, at least 2 bosses are arranged on the drilling gear clutch plate 5, and grooves matched with the bosses in a clamping mode are arranged on the connecting plate 6. Similarly, the transmission process of the drilling gear clutch plate 5 and the connecting plate 6 is still important, the drilling gear clutch plate 5 is connected with the connecting plate 6 through a boss and groove connection mode, and the connection is also rigid connection, so that when the drilling gear clutch plate 5 is in contact with the connecting plate 6, the connection of the drilling gear clutch plate 5 and the connecting plate 6 is more stable, the transmission effect of the rotation energy can be ensured, the instant speed of the working state conversion can be ensured, and the conversion of the working state of the electric hammer is effectively improved.
It should be noted that the safety release clutch also comprises a small bevel gear 7 for mounting the drilling gear clutch plate 5, and the drilling gear clutch plate 5 is mounted on the small bevel gear 6 through a flat key 8. The flat key 8 is close to the side to transmit torque, and it has good centering nature, installs and removes convenient advantage, and in the middle of the actual working process of electric hammer, operating condition and non-operating condition's conversion is very important, and the drilling gear clutch plate 5 realizes driving little awl tooth 6 work through the flat key 8, guarantees the result of use of electric hammer, and simultaneously, the daily maintenance efficiency of electric hammer has been guaranteed to 8 easy dismounting's of flat key.
The small teeth 6 are sleeved with a first bearing 9 and a bearing pad 10. When the electric hammer drills on concrete, floor slabs, brick walls and stone materials, along with a strong impact effect, the impact force of the impact on the clutch structure is reduced through the first bearing 9, the impact resistance of the small bevel gear 6 can be improved, the bearing gasket 10 is arranged between the small bevel gear 6 and the wheel core 1, the impact force of the impact effect on the wheel core 1 is reduced, and the stability of the transmission mechanism is guaranteed.
It should be noted that the safety trip clutch further includes a second bearing 12 disposed below the drilling clutch plate 5 and a clutch spring 13 mounted between the drilling clutch plate 5 and the second bearing 12. The clutch spring 13 has the effects that when the drill gear clutch plate 5 is pressed by the poking sheet 14, the second wheel 2, the ball head guide pillar 3, the tripping spring 4, the wheel core 1 and the connecting plate 6 jointly form a tripping assembly to rotate on the small bevel gear 6 shaft in the air when the three bosses are disengaged from the connecting plate 6 after overcoming the elasticity of the clutch spring 13, the electric hammer realizes a non-working state, the second bearing 12 can ensure the stable rotation of the drill gear clutch plate 5, and the second bearing 12 and the clutch spring 13 jointly ensure that the drill gear clutch plate 5 changes the working state of the electric hammer.
It should be noted that, the safety release clutch also includes a shifting sheet 14 which can be pressed and matched with the drilling gear clutch plate 5 and a stop sheet 15 which can be meshed with the external teeth of the drilling gear clutch plate 5; the safety trip clutch also comprises a positioning pin 16 for mounting the shifting block 14 and the stop block 15, and a stop block spring 17 is abutted to the bottom of the stop block 15. When the drill gear clutch plate 5 is pressed to a certain position by the shifting piece 14, the stop piece 15 pushes the stop piece 15 to move axially along the positioning pin 16 under the action of the stop piece spring 17, so that teeth on the stop piece 15 are meshed with teeth on the drill gear clutch plate 5, and the small bevel teeth 7 are circumferentially locked under the action of the flat key 8 and the small bevel teeth 7. Wherein, the external knob rotates and drives the internal knob 18 to rotate, the internal knob 18 drives the plectrum 14 and the stop piece 15 to move, thereby realizing the function switching, and the installation of the internal knob 18 can refer to the existing internal knob assembly of the electric hammer equipment.
In summary, the safety trip clutch that this embodiment provided mainly includes the wheel core, No. two wheels, bulb guide pillar and trip spring, and the wheel core rotationally sets up in No. two wheels, and the bulb guide pillar is along the radial installation of wheel core and along wheel core circumference distribution, and trip spring suit is in bulb guide pillar column shaft end, and the front end butt of bulb guide pillar is in No. two wheel inner walls, drives the wheel core rotation through the bulb guide pillar when No. two wheels are rotatory to make the wheel core produce relative rotation with No. two wheels at the bulb guide pillar compression trip spring under the condition that receives certain rotational resistance. According to the safe tripping clutch provided by the invention, the original hard connection transmission mode of the steel ball and the short cylinder of the tripping clutch is set as the soft connection transmission mode of the ball head guide post and the tripping spring, and the short cylinder is replaced by the ball head guide post, so that the structure occupies smaller wheel core space of a second wheel, the space structure of the clutch in the electric hammer is optimized, and the occupied space of the electric hammer gear box is reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A safety tripping clutch is characterized by comprising a wheel core (1), a second wheel (2), a ball head guide post (3) and a tripping spring (4), the wheel core (1) is rotatably arranged in the second wheel (2), the ball head guide posts (3) are arranged along the radial direction of the wheel core (1) and are distributed along the circumferential direction of the wheel core (1), the tripping spring (4) is sleeved at the tail end of the ball head guide post (3) post body, the front end of the ball head guide post (3) is abutted against the inner wall of the second wheel (2), when the second wheel (2) rotates, the ball head guide post (3) drives the wheel core (1) to rotate, so that the ball head guide post (3) compresses the tripping spring (4) to enable the wheel core (1) and the second wheel (2) to rotate relatively when the wheel core (1) bears certain rotation resistance.
2. The safety trip clutch according to claim 1, characterized in that the number of the ball stud (3) is at least 3, and the ball studs (3) are evenly distributed along the circumference of the wheel core (1).
3. The safety trip clutch according to claim 1, characterized in that the bottom of the wheel core (1) is provided with a cylindrical boss which is matched with and positioned in a stepped hole of the second wheel (2).
4. The safety trip clutch according to claim 1, the upper end cap of the wheel core (1) is provided with a large washer (11) for limiting the outward turning of the trip spring (4).
5. An electric hammer, comprising a motor, characterized in that, further comprising a safety release clutch, a drilling gear clutch plate (5) and a connecting plate (6) according to any one of claims 1 to 4 connected with the motor, and the bottom of the wheel core (1) of the safety release clutch is provided with a connecting bulge, and the connecting plate (6) is provided with a mounting hole in clamping fit with the connecting bulge.
6. The electric hammer according to claim 5, wherein at least 2 bosses are arranged on the drill gear clutch plate (5), and grooves matched with the bosses in a clamping mode are arranged on the connecting plate (6).
7. An electric hammer according to claim 6, characterized by further comprising a small bevel gear (7) for mounting the drill clutch plate (5), the drill clutch plate (5) being mounted on the small bevel gear (7) by a flat key (8).
8. An electric hammer according to claim 7, wherein the small bevel gear (6) is sleeved with a first bearing (9) and a bearing gasket (10) connected with the safety release clutch.
9. An electric hammer according to claim 8, further comprising a second bearing (12) disposed below the drill clutch plate (5) and a clutch spring (13) mounted between the drill clutch plate (5) and the second bearing (12).
10. An electric hammer according to claim 9, further comprising a pick (14) in press-and-hold engagement with the drill clutch plate (5) and a stop plate (15) engageable with external teeth of the drill clutch plate (5).
11. An electric hammer according to claim 10, further comprising a positioning pin (16) for mounting the pick (14) and the stop (15), wherein a stop spring (17) abuts against the bottom of the stop (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911106766.7A CN112792790A (en) | 2019-11-13 | 2019-11-13 | Safety tripping clutch and electric hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911106766.7A CN112792790A (en) | 2019-11-13 | 2019-11-13 | Safety tripping clutch and electric hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112792790A true CN112792790A (en) | 2021-05-14 |
Family
ID=75803211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911106766.7A Pending CN112792790A (en) | 2019-11-13 | 2019-11-13 | Safety tripping clutch and electric hammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112792790A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414746A (en) * | 2021-07-02 | 2021-09-21 | 重庆弘愿工具(集团)有限公司 | Electric hammer keeps off position switching subassembly |
-
2019
- 2019-11-13 CN CN201911106766.7A patent/CN112792790A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414746A (en) * | 2021-07-02 | 2021-09-21 | 重庆弘愿工具(集团)有限公司 | Electric hammer keeps off position switching subassembly |
| CN113414746B (en) * | 2021-07-02 | 2022-09-06 | 重庆弘愿工具(集团)有限公司 | Electric hammer keeps off position switching subassembly |
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