Safety clutch for electric hammer and electric hammer

Abstract

The invention relates to a safety clutch for an electric hammer and the electric hammer. The tripping gear is provided with a plurality of concave cavities; the retainer is provided with a plurality of through holes; the transmission parts are accommodated in the through holes one by one; a pressing member; the safety part is provided with an initial position and a safety position; when the safety clutch is in a joint state, the pressing piece enables the transmission piece to abut against the cavity wall of the concave cavity, and at the moment, the safety piece is in an initial position; when the safety clutch is switched to the separation state and a distance is generated between the pressing piece and the holding piece, the safety piece is switched to the safety position, so that the safety clutch is kept in the separation state. According to the safety clutch for the electric hammer, the safety piece is additionally arranged, the safety piece can be switched between the initial position and the safety position, the safety piece in the safety position can enable the safety clutch to be stably kept in the separated state, the output torque is greatly reduced, and the safety protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric hammer, in particular to a safety clutch for electric hammer and electric hammer. BACKGROUND

[0002] The electric hammer drives the piston movement by the swing lever bearing and hammers the drill bit by compressed gas, which can be used to drill holes in concrete, floor, brick wall and stone. Since the electric hammer is easy to be stuck when drilling, the existing electric hammer is equipped with a safety clutch. When the output end of the electric hammer is stuck, the safety clutch disconnects the transmission between the power source and the output end, avoiding the operator from being injured by directly bearing the torque.

[0003] CN216883809U discloses a safety clutch, which comprises a gear shaft, and a large gear, a locking sheet, a second gasket, an elastic piece and a third gasket are sequentially sleeved on the gear shaft. The locking sheet is provided with a plurality of steel column accommodating holes for accommodating movable steel columns. When the electric hammer works normally, the rotating driving force of the large gear is transmitted to the gear shaft through the steel columns and the locking sheet in sequence, and the gear shaft transmits power to the transmission assembly to drive the output end to work. When the output end of the electric hammer is stuck due to resistance, the steel columns move away from the large gear due to extrusion when the large gear rotates, so that the large gear and the locking sheet rotate idly, realizing the clutch function. However, after triggering the clutch, if the electric hammer does not stop, the torque still exists, and the operator may still be at risk of bearing the torque. SUMMARY

[0004] Based on the above-mentioned defects in the prior art, the purpose of the present application is to provide a safety clutch for electric hammer, which adds a safety piece to the traditional safety clutch. The safety piece can be switched between the initial position and the safety position. The safety piece in the safety position can stably keep the safety clutch in the disengaged state, greatly reducing the output torque and playing a safety protection role.

[0005] To this end, the present application provides the following technical solutions.

[0006] The present application provides a safety clutch for electric hammer, which comprises:

[0007] A bevel gear for transmission cooperation with the output component of the electric hammer;

[0008] A trip gear sleeved on the outer periphery of the bevel gear with clearance fit therebetween, the trip gear being provided with a plurality of recess cavities;

[0009] A retaining piece sleeved on the bevel gear and provided with a plurality of through holes;

[0010] a plurality of transmission members, each of which is accommodated in the through hole and is movable along the axial direction of the bevel gear;

[0011] a pressing member which is pressed against one side of the transmission member away from the trip gear and is movable along the axial direction;

[0012] a safety member which has an initial position and a safety position;

[0013] When the safety clutch is in the engaged state, the pressing member abuts against the cavity wall of the recess, and the safety member is in the initial position;

[0014] When the safety clutch is switched to the disengaged state so that a space is formed between the pressing member and the retaining member, the safety member is switched to the safety position, so that the safety clutch is kept in the disengaged state.

[0015] Optionally, the safety member is movable along the radial direction of the bevel gear;

[0016] When the safety clutch is switched to the disengaged state so that a space is formed between the pressing member and the retaining member, the safety member is moved to the safety position, and the insertion end of the safety member is inserted between the pressing member and the retaining member, so that the safety clutch is kept in the disengaged state; under external force, the safety member can be moved to the initial position.

[0017] Optionally, the safety member is movably installed on the housing of the electric hammer, and the operation end of the safety member is located outside the housing; external force operates the operation end so that the safety member is restored to the initial position.

[0018] Optionally, the safety clutch comprises a first elastic member, one end of which abuts against the housing and the other end of which is limited by the safety member; when the safety clutch is in the engaged state, the first elastic member is in a compressed state; when the safety clutch is switched to the disengaged state, the elastic force of the first elastic member drives the safety member to move to the safety position.

[0019] Optionally, the safety clutch comprises a first clamping spring, the safety member is provided with a first clamping groove, the first clamping spring is clamped in the first clamping groove, and one end of the first elastic member abuts against the first clamping spring.

[0020] Optionally, when the safety clutch is in the engaged state, the pressing member abuts against the retaining member, and a positioning groove is formed between the retaining member and the pressing member, and the insertion end is inserted into the positioning groove.

[0021] Optionally, an inclined surface is arranged on the outer circumferential end surface of the pressing member, and the inclined surface and the side surface of the retaining member away from the trip gear form the positioning groove.

[0022] Optionally, the end of the insertion end is a sharp corner structure which is shaped to fit the positioning groove.

[0023] Optionally, the safety member is configured to have a dimension in the axial direction which is able to make the force of the transmission member on the trip gear less than or equal to a preset value when the safety member moves to the safety position.

[0024] And / or, the safety clutch comprises a second elastic member and a mounting member, the mounting member is sleeved on the bevel gear, and two ends of the second elastic member are respectively abutted against the pressing member and the mounting member.

[0025] And / or, the transmission member is a steel column.

[0026] The application further provides an electric hammer, which comprises a shell, an output component and the safety clutch for the electric hammer as described above, the safety clutch is located in the shell, the bevel gear is in transmission cooperation with the output component, and the safety member is mounted on the shell.

[0027] The application has the following technical effects:

[0028] The application provides a safety clutch for an electric hammer, which is additionally provided with a safety member on a conventional safety clutch, when the safety clutch is in an engaged state, the safety member is located at an initial position, so as to avoid the interference of the safety member with the engagement work of the safety clutch, when the safety clutch is switched to a separated state, the safety member can be switched to a safety position, and the safety member in the safety position can make the safety clutch stably keep in the separated state, so as to greatly reduce the output torque and play a safety protection role. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Fig. 1 is a perspective view of an electric hammer of the application;

[0030] Figure 2 Fig. 2 is a structural sectional view of the electric hammer of the application;

[0031] Figure 3 Fig. 3 is an assembly structural sectional view of the safety clutch and the shell of the application in an engaged state;

[0032] Figure 4 Fig. 4 is an assembly structural sectional view of the safety clutch and the shell of the application in a separated state;

[0033] Figure 5 Fig. 5 is an exploded structural view of the safety clutch of the application;

[0034] Figure 6 A perspective view of a safety piece of the present application;

[0035] Figure 7 A perspective view of a trip gear of the present application.

[0036] Explanation of reference signs

[0037] 100, electric hammer

[0038] 1, safety clutch;

[0039] 11, bevel gear; 111, second clamping groove; 12, trip gear; 121, concave cavity; 13, retaining piece; 131, through hole; 132, mounting hole; 14, transmission piece; 15, pressing piece; 151, inclined surface; 16, safety piece; 161, insertion end; 162, operation end; 163, first clamping groove; 164, mounting section; 165, connecting section; 17, first elastic piece; 18, first clamping spring; 19, positioning groove; 101, second elastic piece; 102, mounting piece; 103, second clamping spring; 104, third clamping spring; 105, bearing; 106, washer; 107, distance sleeve;

[0040] 2, output component;

[0041] 3, machine shell. DETAILED DESCRIPTION

[0042] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following will be described in detail by way of listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meaning as the technical and scientific terms in the technical field to which the present application belongs.

[0043] In the description of the present application, unless otherwise explicitly defined, the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of the simplified description of the present application, and do not indicate that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, i.e. cannot be understood as a limitation on the present application.

[0044] In the present application, the terms "first", "second" are used only for the purpose of clear description and can not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two; the meaning of "several" is at least one; except for the explicit definition.

[0045] In the present application, unless otherwise explicitly defined, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be understood in a broad sense. For example, "connecting" can be fixed connection, detachable connection or integral molding; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can also be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless otherwise explicitly defined, the first feature "on", "over", "above" and "on", "below", "under", "below" or "below" the second feature can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature "under", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0047] The following is based on Figures 1 to 7 The electric hammer of the present application is described in detail.

[0048] In the present embodiment, as Figures 2 to 3 shown, the electric hammer 100 includes a housing 3, an output member 2 (such as a hammering rod) and a safety clutch 1, and the safety clutch 1 is located in the housing 3. As Figures 3 to 7As shown, the safety clutch 1 comprises a bevel gear 11, a tripping gear 12, a retaining member 13, six transmission members 14, a pressing member 15 and a safety member 16. The bevel gear 11 is in driving cooperation with an output member 2 through a transmission assembly (not shown in the figure) to drive the output member 2 to work (such as hammering). The tripping gear 12 is sleeved on the outer periphery of the bevel gear 11 with a gap therebetween. The tripping gear 12 is provided with six cavities 121. The retaining member 13 is sleeved on the bevel gear 11. The retaining member 13 is provided with six through holes 131. The transmission members 14, the through holes 131 and the cavities 121 are arranged one by one in matching manner. The transmission members 14 are accommodated in the through holes 131 one by one. The through holes 131 are long holes extending along the radial direction of the bevel gear 11. The transmission members 14 can move along the axial direction of the bevel gear 11 in the through holes 131. The pressing member 15 is pressed against one side of the transmission members 14 away from the tripping gear 12. The pressing member 15 can move along the axial direction of the bevel gear 11. Of course, the number of the transmission members 14, the through holes 131 and the cavities 121 is not limited to six, but can be two, three or even more.

[0049] As shown in Figure 3 When the safety clutch 1 is in the engaged state, the pressing member 15 abuts the transmission members 14 against the cavity wall of the cavity 121. When the electric hammer 100 works, the tripping gear 12 serves as a power input end. The rotating driving force of the tripping gear 12 is transmitted to the transmission members 14 through the cavities 121. The transmission members 14 drive the retaining member 13 to rotate. The retaining member 13 drives the bevel gear 11 to rotate, and finally drives the output member 2 to work. At this time, the safety member 16 is in the initial position.

[0050] As shown in Figure 4 When the output member 2 is blocked, the resistance is transmitted to the bevel gear 11, i.e. the bevel gear 11 is blocked in rotation. In the process of rotating the tripping gear 12, the transmission members 14 move away from the tripping gear 12 and press the pressing member 15. The pressing member 15 moves along the axial direction of the bevel gear 11 and generates a gap with the retaining member 13. The tripping gear 12 and the bevel gear 11 are disconnected in force transmission relationship, i.e. the tripping gear 12 is tripped and idles. The safety clutch 1 is switched to the disengaged state. At the same time, the safety member 16 is switched to the safety position, so that the safety clutch 1 is stably kept in the disengaged state. The safety member 16 can be restored to the initial position under external force. The safety clutch 1 can be switched to the engaged state again.

[0051] By adopting the above technical scheme, the safety part 16 is additionally arranged on the traditional safety clutch, when the safety clutch 1 is in the engaged state, the safety part 16 is located at the initial position, avoiding the interference of the safety part 16 with the engagement of the safety clutch 1, when the safety clutch 1 is switched to the separated state, the safety part 16 can be moved to the safety position, and the safety part 16 in the safety position can make the safety clutch 1 stably keep in the separated state, the output torque is greatly reduced, and the safety protection effect is achieved.

[0052] In an embodiment, the safety part 16 is movably installed on the shell 3, and the safety part 16 can move in the radial direction of the bevel gear 11. When the safety clutch 1 is switched to the separated state, due to the spacing between the pressing part 15 and the retaining part 13, the safety part 16 can be moved to the safety position, the insertion end 161 of the safety part 16 can be inserted between the pressing part 15 and the retaining part 13, and due to the insertion end 161 being located between the pressing part 15 and the retaining part 13, the pressing part 15 and the retaining part 13 can be in a spaced apart position relationship, thereby making the safety clutch 1 stably keep in the separated state.

[0053] In an embodiment, as shown in Figures 1 to 4 , the safety part 16 is movably installed on the shell 3 of the electric hammer 100, and the operation end 162 of the safety part 16 is located outside the shell 3, when the safety clutch 1 needs to be switched to the engaged state, the user can manually pull out the operation end 162, so that the safety part 16 returns to the initial position, and thus the safety clutch 1 can return to the engaged state.

[0054] Further, as shown in Figures 3 to 5 , the safety clutch 1 comprises a first elastic part 17, one end of the first elastic part 17 abuts against the shell 3, and the other end is limited to the safety part 16. When the safety clutch 1 is in the engaged state, the first elastic part 17 is in the compressed state, so that when the safety clutch 1 is switched to the separated state, the rebound force of the first elastic part 17 drives the safety part 16 to move to the safety position. Of course, the first elastic part 17 can also not be provided, and when the output member 2 is blocked, the safety part 16 can be manually pushed in.

[0055] Further, as shown in Figures 3 to 5 , the safety clutch 1 comprises a first clamping spring 18, the outer periphery of the safety part 16 is provided with a first clamping groove 163, the first clamping spring 18 is clamped in the first clamping groove 163, and one end of the first elastic part 17 abuts against the first clamping spring 18.

[0056] In an embodiment, as shown in Figure 3As shown, when the safety clutch 1 is in the engaged state, the pressing piece 15 abuts against the retaining piece 13, and a positioning groove 19 is formed between the retaining piece 13 and the pressing piece 15, the insertion end 161 is inserted into the positioning groove 19, and the insertion end 161 is positioned by the positioning groove 19, which facilitates the accurate and rapid insertion of the insertion end 161 between the pressing piece 15 and the retaining piece 13 when the safety clutch 1 is switched to the disengaged state, and ensures that the safety piece 16 plays a safety protection role.

[0057] Further, as shown in Figure 3 , the outer peripheral end surface of the pressing piece 15 is provided with a bevel 151, and the bevel 151 and the side surface of the retaining piece 13 away from the trip gear 12 form the positioning groove 19, which is simple to process. Specifically, the side surface of the retaining piece 13 away from the trip gear 12 is a plane, and the plane and the bevel 151 form the acute-angle-shaped positioning groove 19. Of course, the bevel can also be provided on the outer peripheral end surface of the retaining piece 13, or bevels are provided on the outer peripheral end surfaces of both the pressing piece 15 and the retaining piece 13 to form the positioning groove 19.

[0058] Further, as shown in Figure 3 and Figure 6 , the end of the insertion end 161 is in a sharp corner structure, which cooperates with the shape of the positioning groove 19, and the bevels of the two cooperate to guide the insertion end 161 during the process of inserting the insertion end 161 between the pressing piece 15 and the retaining piece 13, which facilitates the rapid insertion of the insertion end 161.

[0059] In an embodiment, the size of the safety piece 16 in the axial direction of the bevel gear 11 is configured such that, when the safety piece 16 moves to the safety position, the force of the transmission piece 14 on the trip gear 12 is less than or equal to a preset value. Specifically, as shown in Figure 4 , after the safety piece 16 is inserted between the pressing piece 15 and the retaining piece 13, the size of the safety piece 16 in the axial direction of the bevel gear 11 corresponds to the axial spacing between the pressing piece 15 and the retaining piece 13, and by limiting the size of the safety piece 16, the axial spacing between the pressing piece 15 and the retaining piece 13 can be controlled, and thus the force of the transmission piece 14 on the trip gear 12 can be controlled. In this way, by reducing the force of the transmission piece 14 on the trip gear 12 to zero or close to zero, the safety risk is eliminated.

[0060] In an embodiment, as shown in Figure 3 and Figure 6 , the safety piece 16 includes an operation end 162, a mounting segment 164, a connecting segment 165, and an insertion end 161 connected in sequence, the machine shell 3 is provided with a fitting hole (not shown in the figure), the mounting segment 164 is movably threaded through the fitting hole, and the operation end 162 is located outside the machine shell 3. The operation end 162 can be in a round knob shape, which is convenient for users to hold. As shown in Figure 3As shown, due to the small axial spacing between the tripping gear 12 and the retaining member 13, in order to avoid the tripping gear 12 interfering with the stretching of the first elastic member 17, the engaging section 165 extends obliquely towards the retaining member 13, so that the insertion end 161 is opposite the positioning groove 19, the axial spacing between the mounting section 164 and the tripping gear 12 is greater than the axial spacing between the insertion end 161 and the tripping gear 12, and the first elastic member 17 and the first circlip 18 are respectively mounted on the mounting section 164.

[0061] In an embodiment, as shown in Figure 3 and Figure 5 shown, the safety clutch 1 comprises a second elastic member 101 and a mounting member 102, the mounting member 102 is sleeved on the bevel gear 11, and the two ends of the second elastic member 101 are respectively abutted against the pressing member 15 and the mounting member 102. When the output member 2 is blocked, the pressing member 15 moves along the axial direction of the bevel gear 11 under the extrusion of the transmission member 14 and compresses the second elastic member 101. When the safety clutch 1 switches to the engaged state, the second elastic member 101 rebounds to reset the pressing member 15, and the pressing member 15 re-abuts the transmission member 14 against the cavity wall of the concave cavity 121.

[0062] Further, as shown in Figure 3 and Figure 5 shown, the outer periphery of the bevel gear 11 is provided with a second clamping groove 111, and the second clamping groove 111 contains a second circlip 103, which limits the movement of the mounting member 102 in the direction away from the second elastic member 101.

[0063] In an embodiment, the transmission member 14 is a steel column, which is simple in structure and high in strength.

[0064] In an embodiment, as shown in Figure 5 shown, the six transmission members 14 are uniformly and evenly distributed along the circumferential direction of the bevel gear 11, which is beneficial to force balance.

[0065] In an embodiment, as shown in Figure 3 and Figure 5 shown, the retaining member 13 is provided with a mounting hole 132, and the mounting hole 132 is matched with the outer contour shape of the bevel gear 11, so that the retaining member 13 can drive the bevel gear 11 to rotate synchronously. For example, the shape of the mounting hole 132 can be a non-circular shape, such as a triangular shape, a square shape, an elliptical shape or a special shape.

[0066] In an embodiment, as shown in Figure 3 and Figure 5 shown, the outer periphery of the bevel gear 11 is sleeved with a third circlip 104, and the third circlip 104 is abutted against one side of the retaining member 13 away from the tripping gear 12, so as to prevent the retaining member 13 from moving away from the tripping gear 12.

[0067] In an embodiment, as shown inFigure 3 and Figure 5 As shown in Figs. 1 and 2, a bearing 105 is sleeved on the outer periphery of the bevel gear 11, the bearing 105 is located on the side of the trip gear 12 away from the retaining member 13, and a washer 106 is arranged between the bearing 105 and the trip gear 12.

[0068] In an embodiment, as shown in Figs. 1 and 2, a distance sleeve 107 is sleeved on the outer periphery of the bevel gear 11, the distance sleeve 107 is located on the side of the bearing 105 away from the trip gear 12, and the distance sleeve 107 is used to separate the bearing 105 and the shaft shoulder of the end of the bevel gear 11. Figure 3 and Figure 5 As shown in Figs. 1 and 2, a distance sleeve 107 is sleeved on the outer periphery of the bevel gear 11, the distance sleeve 107 is located on the side of the bearing 105 away from the trip gear 12, and the distance sleeve 107 is used to separate the bearing 105 and the shaft shoulder of the end of the bevel gear 11.

[0069] It should be understood that the above embodiments are exemplary and are not intended to include all possible embodiments encompassed by the claims. Various modifications and changes can also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application which can not be explicitly described. Therefore, the above embodiments only express several embodiments of the present application, and do not limit the protection scope of the present application.

Claims

1. A safety clutch for an electric hammer, characterized by comprising: The safety clutch (1) comprises: a bevel gear (11) for transmission cooperation with an output component (2) of the electric hammer (100); a tripping gear (12) sleeved on the outer periphery of the bevel gear (11) and gap cooperation therebetween, the tripping gear (12) being provided with a plurality of cavities (121); a retaining member (13) sleeved on the bevel gear (11) and provided with a plurality of through holes (131); a plurality of transmission members (14) each accommodated in the through hole (131), the transmission member (14) being movable along the axial direction of the bevel gear (11); a pressing member (15) abutting against one side of the transmission member (14) away from the tripping gear (12) and movable along the axial direction; a safety member (16) having an initial position and a safety position; when the safety clutch (1) is in the engaged state, the pressing member (15) abuts the transmission member (14) against the cavity wall of the cavity (121), and at this time, the safety member (16) is in the initial position; when the safety clutch (1) is switched to the disengaged state so that a gap is generated between the pressing member (15) and the retaining member (13), the safety member (16) is switched to the safety position, and the safety position is such that the safety clutch (1) is kept in the disengaged state.

2. The safety clutch for an electric hammer according to claim 1, characterized by The safety member (16) is movable along the radial direction of the bevel gear (11); when the safety clutch (1) is switched to the disengaged state so that a gap is generated between the pressing member (15) and the retaining member (13), the safety member (16) is moved to the safety position, the insertion end (161) of the safety member (16) is inserted between the pressing member (15) and the retaining member (13), and the safety clutch (1) is kept in the disengaged state; under external force, the safety member (16) can be moved to the initial position.

3. The safety clutch for an electric hammer according to claim 2, wherein The safety member (16) is movably installed on the housing (3) of the electric hammer (100), and the operation end (162) of the safety member (16) is located outside the housing (3); external force operates the operation end (162) so that the safety member (16) is restored to the initial position.

4. The safety clutch for an electric hammer according to claim 3, characterized by The safety clutch (1) comprises a first elastic member (17) having one end abutting against the housing (3) and the other end limited to the safety member (16); when the safety clutch (1) is in the engaged state, the first elastic member (17) is in the compressed state; when the safety clutch (1) is switched to the disengaged state, the elastic force of the first elastic member (17) drives the safety member (16) to move to the safety position.

5. The safety clutch for an electric hammer according to claim 4, wherein The safety clutch (1) comprises a first clamping spring (18), the safety member (16) is provided with a first clamping groove (163), the first clamping spring (18) is clamped in the first clamping groove (163), and one end of the first elastic member (17) abuts against the first clamping spring (18).

6. The safety clutch for an electric hammer according to any one of claims 2 to 5, characterized in that, When the safety clutch (1) is in the engaged state, the pressing piece (15) abuts against the retaining piece (13), and a positioning groove (19) is formed between the retaining piece (13) and the pressing piece (15), and the insertion end (161) is inserted into the positioning groove (19).

7. The safety clutch for an electric hammer according to claim 6, wherein An outer peripheral end surface of the pressing piece (15) is provided with a slope (151), and the slope (151) and a side surface of the retaining piece (13) away from the tripping gear (12) form the positioning groove (19).

8. The safety clutch for an electric hammer according to claim 7, characterized in that An end of the insertion end (161) is a sharp corner structure, and the sharp corner structure is matched with the shape of the positioning groove (19).

9. The safety clutch for an electric hammer according to any one of claims 2 to 5, characterized in that, The safety piece (16) is configured in the axial direction, and when the safety piece (16) moves to a safety position, the size can make the force of the transmission piece (14) on the tripping gear (12) less than or equal to a preset value. And / or, the safety clutch (1) comprises a second elastic piece (101) and a mounting piece (102), the mounting piece (102) is sleeved on the bevel gear (11), and two ends of the second elastic piece (101) respectively abut against the pressing piece (15) and the mounting piece (102). And / or, the transmission piece (14) is a steel column.

10. An electric hammer, characterized by The electric hammer (100) comprises a machine shell (3), an output component (2), and the safety clutch for the electric hammer according to any one of claims 1-9, the safety clutch (1) is located in the machine shell (3), the bevel gear (11) is in transmission cooperation with the output component (2), and the safety piece (16) is mounted on the machine shell (3).

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