Angle grinder with safety triggering device
By employing a dual limit mechanism and mechanical linkage design, the problems of accidental activation and insufficient safety in traditional angle grinders have been solved, enabling safe start-up and low maintenance costs, and improving safety and operational comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional angle grinders have problems such as high risk of accidental activation, insufficient safety and high maintenance costs. Existing safety solutions are prone to accidental start-up due to mechanical fatigue or circuit failure.
Employing a dual limiting mechanism and mechanical linkage design, the device ensures that it can only be started when the device is held correctly by tilting the first limiting component and fixing it with a pin of the second limiting component. Combined with the anti-loosening structure of the knurled shaft, the connection stability is improved.
It effectively prevents accidental activation or start-up, reduces the risk of workplace injuries, simplifies structural design, reduces operator fatigue, and lowers maintenance costs.
Smart Images
Figure CN224011931U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to angle grinder technical field, concretely is an angle grinder with safety trigger device. BACKGROUND
[0002] Traditional angle grinder generally relies on single mechanical switch or electronic sensor to realize start-stop control, and has the following significant defects: high risk of accidental touch: traditional switch lacks physical locking mechanism, and the device is easy to start accidentally when falling, colliding or accidentally touching, leading to accidents caused by high-speed idling of cutting blade. Insufficient safety: some designs use simple spring press switch, but spring fatigue or contact offset after long-term use may cause locking failure. Complexity of structure and maintenance cost: existing safety solutions (such as electronic induction lock) rely on precision circuit, which is high in maintenance cost. SUMMARY
[0003] The utility model provides an angle grinder with safety trigger device, which overcomes the deficiencies described in the background art.
[0004] The utility model solves the technical problems by adopting the following technical scheme:
[0005] An angle grinder with safety trigger device, comprising an angle grinder and a safety trigger device, the safety trigger device is installed on the angle grinder for triggering start, the angle grinder comprises a hand-held handle, the safety trigger device comprises a base, a protective handle, a trigger body, a first limiting piece and a second limiting piece, the first hollow area is provided on the hand-held handle for the trigger body to pass through, the start button is arranged in the hand-held handle, the trigger body is in contact with the start button to trigger start, the end of the protective handle is connected to the base through the first shaft rod hinge, the trigger body is arranged on the back side of the protective handle, the first limiting piece is installed on the protective handle through the second shaft rod and the coil spring, the second limiting piece is also slidably arranged on the side end of the base, the second limiting piece is installed on the side surface of the protective handle, and the side surface of the protective handle is provided with a through hole, and the second limiting piece extends into the through hole to keep the protective handle in the current position.
[0006] The angle grinder in the utility model ensures that the device can only be started when it is correctly held through the double limiting mechanism and the linkage of the trigger body, thereby preventing misoperation or accidental start. Hinge connection: the protective handle is hinged to the base through the first shaft rod, and the protective handle can rotate around the shaft. The second limiting piece needs to be withdrawn from the through hole (manually slide), otherwise the protective handle cannot be completely pressed down.
[0007] A preferred technical scheme: the protective handle is provided with a second hollow area and a first groove, and the first limiting piece rotates around the second shaft rod as the rotating base point in the second hollow area.
[0008] A preferred technical scheme: the coil spring has a first end portion and a second end portion formed on both sides, the first end portion is limited to the surface of the first groove, and the second end portion is limited to the surface of the first limiting piece.
[0009] A preferred technical solution: in the initial state, the first limiting piece is installed in an inclined state on the protective handle, and the bottom end of the first limiting piece is limited from contacting the trigger body and the start button by contacting the outer surface of the hand handle.
[0010] A preferred technical solution: in the stressed state of the first limiting piece, the first limiting piece causes the coil spring to deform, a lower notch is arranged on the hand handle, the bottom end of the first limiting piece is displaced to the lower notch, the protective handle is close to the hand handle, and the trigger body on the back side of the protective handle contacts the start button.
[0011] A preferred technical solution: the second limiting piece comprises a button part and a rod part, the rod part is arranged on the back side of the button part, and the rod part is externally nested with a spring.
[0012] A preferred technical solution: a second groove is arranged around the perforation.
[0013] A preferred technical solution: the end of the rod part is provided with a limiting part, after the second limiting piece is inserted into the perforation, the limiting part contacts the inner side wall of the protective handle, and the second limiting piece is limited from being offset outward.
[0014] A preferred technical solution: the side end of the first shaft rod is provided with a knurled surface, the knurled surface shaft rod can be directly pressed into the plastic / metal hole of the base, without the need for additional fasteners (such as screws, clamping springs).
[0015] A preferred technical solution: the angle grinder further comprises an auxiliary handle, a driving assembly, a polishing piece and a protective cover, the driving assembly is arranged in the hand handle, the driving assembly drives the polishing piece to rotate, the polishing piece is provided with the protective cover, and the auxiliary handle is connected and arranged on the hand handle.
[0016] By adopting the above technical solution, the utility model has the beneficial effects that:
[0017] 1. The double limiting mechanism (inclined locking of the first limiting piece and bolt fixing of the second limiting piece) ensures that the device can only be started when it is correctly held, effectively preventing accidental touch or accidental start, and reducing the risk of injury. The linkage design of the protective handle and the trigger body further enhances the anti-mis-touch capability, and the anti-loose structure of the knurled shaft rod improves the stability of the hinge connection, ensuring that it can still be safely locked after long-term use.
[0018] 2. The protective handle in the utility model has an auxiliary holding function, and the surface shape can be designed to conform to ergonomics, reducing operational fatigue. The structure design is simple, easy to manufacture and assemble. BRIEF DESCRIPTION OF DRAWINGS
[0019] The utility model will be further described below in combination with the drawings and examples.
[0020] Figure 1 It is a structural schematic diagram of the utility model.
[0021] Figure 2 Structure diagram of the guard handle;
[0022] Figure 3 Structure diagram of the guard handle from another perspective;
[0023] Figure 4 Structure diagram of the first limiting member;
[0024] Figure 5 Structure diagram of the angle grinder in a state of the guard handle removed;
[0025] Figure 6 Structure diagram of the second limiting member;
[0026] Figure 7 Structure diagram of the second limiting member from a bottom end perspective;
[0027] Figure 8 Structure diagram of Figure 7 Local enlarged diagram of A in FIG. 6.
[0028] Explanation of main reference signs:
[0029] 1, angle grinder; 11, hand-held handle; 111, first hollowed-out area; 112, lower notch; 12, start button; 2, safety trigger device; 21, base; 22, guard handle; 221, first shaft rod; 2211, knurl; 222, through hole; 2221, second groove; 223, second hollowed-out area; 224, first groove; 23, trigger body; 24, first limiting member; 241, second shaft rod; 242, coil spring; 2421, first end; 2422, second end; 25, second limiting member; 251, button part; 252, rod body part; 253, limiting part; 254, spring; 3, auxiliary handle; 4, grinding disc; 5, guard cover. DETAILED DESCRIPTION
[0030] As Figures 1-8As shown, the embodiment provides an angle grinder with a safety trigger device, which comprises an angle grinder 1 and a safety trigger device 2. The safety trigger device 2 is arranged on the angle grinder 1 for triggering the start. The angle grinder 1 comprises a hand-held handle 11. The safety trigger device 2 comprises a base 21, a protective handle 22, a trigger body 23, a first limiting part 24 and a second limiting part 25. The first hollow area 111 is arranged on the hand-held handle 11 for the trigger body 23 to pass through. The start button 12 is arranged in the hand-held handle 11. The trigger body 23 is in contact with the start button 12 to trigger the start. The end of the protective handle 22 is hingedly connected to the base 21 through the first shaft 221. The trigger body 23 is arranged on the back side of the protective handle 22. The first limiting part 24 is arranged on the protective handle 22 through the second shaft 241 and the coil spring 242. The second limiting part 25 is slidably arranged on the side end of the base 21. The second limiting part 25 is arranged on the side of the protective handle 22. The side of the protective handle 22 is provided with the through hole 222. The second limiting part 25 extends into the through hole 222 to keep the protective handle 22 in the current position.
[0031] Further, the second hollow area 223 and the first recess 224 are arranged on the protective handle 22. The first limiting part 24 rotates around the second shaft 241 as the rotating base point in the second hollow area 223.
[0032] Further, the first end 2421 and the second end 2422 are formed on both sides of the coil spring 242. The first end 2421 is limited to the surface of the first recess 224. The second end 2422 is limited to the surface of the first limiting part 24.
[0033] Further, in the initial state, the first limiting part 24 is arranged on the protective handle 22 in the inclined state. The bottom end of the first limiting part 24 is limited to the outer surface of the hand-held handle 11 to limit the contact between the trigger body 23 and the start button 12.
[0034] Further, in the stressed state of the first limiting part 24, the first limiting part 24 causes the coil spring 242 to deform. The lower notch 112 is arranged on the hand-held handle 11. The bottom end of the first limiting part 24 is displaced to the lower notch 112, so that the protective handle 22 is close to the hand-held handle 11. The trigger body 23 on the back side of the protective handle 22 is in contact with the start button 12.
[0035] Further, the second limiting part 25 comprises the button part 251 and the rod part 252. The rod part 252 is arranged on the back side of the button part 251. The spring 254 is arranged on the outer side of the rod part 252.
[0036] Further, the second recess 2221 is arranged around the through hole 222.
[0037] Further, the end of the rod body 252 is provided with a limiting part 253, after the second limiting part 25 extends into the through hole 222, the limiting part 253 is in contact with the inner side wall of the protective handle 22, and the second limiting part 25 is limited to deviate outward.
[0038] Further, the side end of the first shaft 221 is provided with a knurled 2211, the knurled shaft can be directly pressed into the plastic / metal hole of the base 21, without additional fasteners (such as screws, clamps).
[0039] Further, the angle grinder 1 further comprises an auxiliary handle 3, a driving assembly, a grinding disc 4, and a protective cover 5, the driving assembly is arranged in the hand-held handle 11 and drives the grinding disc 4 to rotate, the protective cover 5 is arranged around the grinding disc 4, and the auxiliary handle 3 is connected and arranged on the hand-held handle 11.
[0040] The angle grinder 1 of the embodiment can be started only when the user correctly holds and actively operates through the mechanical linkage + double limiting safety trigger device 2, so that accidental touch or accidental start is effectively prevented. The core working principle is as follows: initial locking state (not holding), the first limiting part 24 is in an inclined state, the bottom end of the first limiting part 24 is in close contact with the outer surface of the hand-held handle 11, forming a rigid block, and preventing the protective handle 22 from being pressed downward. At this time, the trigger body 23 on the back side of the protective handle 22 cannot pass through the first hollow area 111 to contact and start the start button 12, and the angle grinder 1 remains in a power-off state. The second limiting part 25 is fixed by a plug-in pin, the rod body 252 of the second limiting part 25 is inserted into the through hole 222 on the side of the protective handle 22, further locking the position of the protective handle 22, and forming double insurance. The unlocking and triggering process (when correctly holding), first step: releasing the first limiting, the user holds the protective handle 22 and applies pressure, pushes the first limiting part 24 to rotate around the second shaft 241, overcomes the elastic force of the coil spring 242, and makes the bottom end of the first limiting part 24 separate from the surface of the hand-held handle 11 and slide into the lower notch 112, at this time, the first limiting part 24 no longer blocks the movement of the protective handle 22; second step: releasing the second limiting, the button part 251 of the second limiting part 25 needs to be controlled synchronously, so that the rod body 252 exits the through hole 222; third step: triggering and starting, after the protective handle 22 is completely pressed downward, the trigger body 23 on the back side thereof passes through the first hollow area 111, presses the start button 12 in the hand-held handle 11, and the circuit is turned on, so that the driving assembly starts the grinding disc 4 to rotate. In the utility model, the reset mechanism of the angle grinder 1 releases the protective handle 22, the coil spring 242 rebounds, pulls the first limiting part 24 to reset to the inclined state, and the bottom end re-contacts the outer surface of the hand-held handle 11. The rod body 252 is pushed to re-insert into the through hole 222, and the double locking is restored.
[0041] The above merely describes preferred embodiments of the present application, and therefore cannot limit the scope of the present application, i.e. equivalent changes and modifications made according to the scope of the present application and the content of the specification should still fall within the scope of the present application.
Claims
1. An angle grinder with a safety trigger device, characterized in that, The device includes an angle grinder and a safety triggering device. The angle grinder is equipped with a safety triggering device for triggering startup. The angle grinder includes a handle. The safety triggering device includes a base, a protective handle, a trigger body, a first limiting member, and a second limiting member. The handle has a first hollow area for the trigger body to pass through. A start button is located inside the handle. The trigger body contacts the start button to trigger startup. The end of the protective handle is hinged to the base via a first shaft. The trigger body is located on the back side of the protective handle. The first limiting member is mounted on the protective handle via a second shaft and a coil spring. A second limiting member is slidably mounted on the side of the base. The second limiting member is mounted on the side of the protective handle, and a through hole is provided on the side of the protective handle. The second limiting member extends into the through hole to keep the protective handle in its current position.
2. The angle grinder with a safety trigger device according to claim 1, characterized in that, The protective handle is provided with a second hollow area and a first groove, and the first limiting member rotates within the second hollow area with the second shaft as the rotation base.
3. The angle grinder with a safety trigger device according to claim 2, characterized in that, The coil spring has a first end and a second end on both sides. The first end is limited to the surface of the first groove, and the second end is limited to the surface of the first limiting member.
4. The angle grinder with a safety trigger device according to claim 1, characterized in that, In the initial state, the first limiting member is installed on the protective handle in an inclined state, and the bottom end of the first limiting member restricts the contact between the trigger body and the start button by contacting the outer surface of the hand handle.
5. The angle grinder with a safety trigger device according to claim 1, characterized in that, When the first limiting member is under force, the first limiting member causes the coil spring to deform. The handle is provided with a recess. The bottom end of the first limiting member moves to the recess, so that the protective handle is close to the handle. The trigger body on the back of the protective handle contacts the start button.
6. The angle grinder with a safety trigger device according to claim 1, characterized in that, The second limiting member includes a button part and a rod part. The rod part is provided on the back side of the button part, and a spring is nested outside the rod part.
7. The angle grinder with a safety trigger device according to claim 1, characterized in that, A second groove is provided around the perforation.
8. The angle grinder with a safety trigger device according to claim 6, characterized in that, The end of the rod body is provided with a limiting part. After the second limiting member extends into the through hole, the limiting part contacts the inner wall of the protective handle, restricting the second limiting member from shifting outward.
9. The angle grinder with a safety trigger device according to claim 1, characterized in that, The first shaft has knurling on its side end.
10. The angle grinder with a safety trigger device according to claim 1, characterized in that, The angle grinder also includes an auxiliary handle, a drive assembly, a grinding disc, and a protective cover. The drive assembly is installed inside the handle and drives the grinding disc to rotate. The protective cover is installed around the grinding disc, and the auxiliary handle is connected to the handle.