Adjustable angle power tool

Abstract

The present application is an angle-adjustable power tool, which comprises a handle, an operating head and a positioning assembly. The handle is provided with a clamping seat, which is fixed on the top of the handle and faces the operating head, and a communication slot. The operating head is rotatably combined with the handle and is provided with a pivot seat and a head. The pivot seat is arranged on the bottom of the operating head and is rotatably combined with the handle, so that the clamping seat is located between the top of the handle and the pivot seat. The head is arranged on the top of the operating head and is connected with the pivot seat. The positioning assembly is arranged between the handle and the operating head and is provided with a positioning seat, an elastic member and a pulling member, thereby providing an angle-adjustable power tool with a simple structure and accurate positioning.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a power tool with a simplified structure and accurate positioning that can adjust the angle. Background Technology

[0002] Existing power tools are driven by electricity or gas to process workpieces. Existing power tools have a handle and an actuator connected to the handle. When the user holds the handle and processes the workpiece through the actuator, if the relative position of the user and the workpiece cannot be adjusted by the actuator, it will increase the inconvenience of use. Therefore, a pivoting device is currently set between the handle and the actuator of the existing power tool. The angle of the actuator relative to the handle is adjusted by the pivoting device so that the user can process the workpiece at an appropriate angle.

[0003] However, while existing power tools can adjust the angle between the actuator and the handle by setting up the pivot device to achieve the effect of convenient use, the pivot device between the actuator and the handle lacks a stable positioning structure. This allows the actuator to swing relative to the handle during processing after the angle is adjusted, which can easily cause damage to the workpiece and endanger industrial safety. Furthermore, if the existing power tool is gas-driven, in order to accurately transmit gas through the handle and the pivot device to the actuator, the existing power tool needs to set up a complex and difficult-to-manufacture gas flow channel between the handle, the pivot device and the actuator, which increases the manufacturing cost and time. In summary, existing power tools do have aspects that need to be improved. Summary of the Invention

[0004] To address the problems and shortcomings of existing power tools, such as the tendency for the actuator head to swing relative to the handle during machining after the angle of the actuator head is adjusted, and the need for complex and difficult-to-machine gas flow channels between the handle, pivot device, and actuator head, which increase manufacturing costs and time, this invention provides an adjustable-angle power tool. The main feature is an automatically resetting positioning assembly between the handle and the actuator head, allowing the actuator head to be stably connected to the handle after angle adjustment. Furthermore, through spatial and structural configuration, a simplified flow channel is formed between the handle and the actuator head, thereby providing a simplified and accurately positioned adjustable-angle power tool.

[0005] To achieve the above objectives, the present invention provides an adjustable-angle power tool, comprising a handle, an actuator head, and a positioning assembly, wherein:

[0006] The handle is provided with a locking seat, which is fixed to the top of the handle and faces the actuating head. The locking seat has a connecting groove inside.

[0007] The actuator is rotatably coupled to the handle and has a pivot seat and a head. The pivot seat is located at the bottom of the actuator and rotatably coupled to the handle, such that the locking seat is located between the top of the handle and the pivot seat. The head is located at the top of the actuator and connected to the pivot seat; and

[0008] The positioning assembly is located between the handle and the actuating head and includes a positioning seat, an elastic element, and a lever. The positioning seat is rotatably and movablely mounted on the handle and can be selectively engaged with the locking seat. The elastic element is located in the communicating groove of the locking seat and abuts against the positioning seat, pushing the positioning seat to engage with the locking seat. The lever is rotatably mounted on the top of the handle and abuts against one side of the positioning seat. When the lever rotates relative to the positioning seat, it causes the positioning seat to separate from the locking seat and compresses the elastic element. The angle of the actuating head relative to the handle can be adjusted by rotating the pivot relative to the handle. After adjustment, the compressed elastic element causes the positioning seat to move toward the locking seat and engage with it for positioning.

[0009] Furthermore, in the aforementioned adjustable-angle power tool, the positioning seat has at least one sliding groove on its outer side, and the lever has at least one protrusion on one side facing the positioning seat. The at least one protrusion can be selectively located in the at least one sliding groove or abut against the outer side of the positioning seat, so that the positioning seat separates from the locking seat as the lever rotates.

[0010] Furthermore, in the aforementioned adjustable-angle power tool, the positioning seat is provided with a connector, a positioning plate, and a linkage seat. The connector is located at one end of the positioning seat and within the communicating groove of the locking seat, facing the pivot seat. The connector is fixedly engaged with the pivot seat. The positioning plate is located in the middle section of the positioning seat and is engaged with the connector. The positioning plate is movably located within the communicating groove of the locking seat and selectively engaged with the locking seat. The linkage seat is located at the end of the positioning seat away from the connector. At least one sliding groove of the positioning seat is located on the side of the linkage seat away from the positioning plate.

[0011] Preferably, in the aforementioned adjustable-angle power tool, the pivot seat is provided with a sleeve hole recessed on the outer surface of the pivot seat away from the handle, the connector is provided with a fixing hole and a fixing member, the fixing hole is axially recessed in the connector and is linearly opposite to the sleeve hole, and the fixing member is fixedly engaged with the fixing hole on the side of the pivot seat away from the handle through the sleeve hole, so that the positioning seat is fixedly engaged with the pivot seat through the connector.

[0012] Preferably, in the aforementioned adjustable-angle power tool, the handle is provided with a receiving groove and a pivoting groove. The receiving groove extends laterally through the top of the handle and faces the actuating head. The pivoting groove is recessed in the top of the handle and communicates with the receiving groove. The locking seat is fixed in the pivoting groove, and the linkage seat extends into the receiving groove through the communicating groove of the locking seat and the pivoting groove.

[0013] Preferably, the adjustable-angle power tool described above, wherein:

[0014] The handle has a housing and a connecting head. The connecting head is located on the top of the housing and is connected to the housing. The receiving groove and the pivoting groove are formed on the connecting head. The connecting head has a longitudinally arranged air groove below the pivoting groove. The air groove is connected to the pivoting groove and the housing.

[0015] The mounting base has at least one through-hole radially penetrating its outer surface, the at least one through-hole communicating with the through-groove; the mounting base also has an annular groove recessed on its outer surface, the annular groove communicating with the through-groove via the at least one through-hole; and

[0016] The pivot seat is provided with a connecting groove and a vent. The connecting groove is laterally recessed on the side of the pivot seat facing the connecting head. The locking seat extends out of the connecting head and is accommodated in the connecting groove. The vent is longitudinally formed inside the pivot seat and communicates with the annular groove of the locking seat through the connecting groove.

[0017] Preferably, in the aforementioned adjustable-angle power tool, the locking seat has several locking units arranged in a ring and facing the actuating head on one side of the side adjacent to the pivot groove, and the positioning plate has a positioning structure on the side facing the locking seat with several locking units, the positioning structure being able to engage with each of the locking units of the locking seat.

[0018] Preferably, in the aforementioned adjustable angle power tool, the locking seat has a limiting groove recessed on the outer surface of the plurality of locking units, which is spaced apart from the annular groove. The pivot seat has a plurality of pivot bolts, which are transversely inserted through the pivot seat and engage with the limiting groove of the locking seat, thereby pivotally engaging the pivot seat with the coupling head.

[0019] Preferably, in the aforementioned adjustable-angle power tool, the positioning seat has several annularly spaced sliding grooves on the linkage seat.

[0020] Preferably, in the aforementioned adjustable angle power tool, the elastic element is sleeved on the outer surface of the connector of the positioning seat and abuts against the positioning plate. The positioning assembly has a stop ring in the locking seat that abuts against the elastic element, so that both ends of the elastic element abut against the positioning plate and the stop ring respectively.

[0021] By utilizing the aforementioned technical features, the adjustable-angle power tool of the present invention, in use, only requires rotating the lever relative to the linkage seat to move the positioning seat relative to the coupling head. This causes the positioning structure of the positioning disc to separate from the locking units of the locking seat, freeing the positioning seat from the locking restriction of the locking seat. The user can rotate the actuator head to change its angle relative to the handle as needed. After adjusting the angle, the compressed elastic element automatically pushes the positioning seat towards the coupling head, causing the positioning disc to lock into the locking seat. Through the structural relationship between the locking seat, the positioning seat, and the linkage seat, the angle of the actuator head relative to the handle is stably and accurately positioned, preventing the actuator head from swinging relative to the handle during processing. This avoids damage to the workpiece and potential safety hazards. Furthermore, by providing a connecting air groove in the coupling head, a connecting groove in the locking seat, a connecting hole, an annular groove, and a ventilation channel in the pivot seat, high-pressure gas entering through the housing can enter the head of the actuator head via the simplified configuration of the connecting air groove, connecting groove, connecting hole, annular groove, and ventilation channel. This drives the head to process the workpiece, eliminating the need for complex and difficult-to-machine gas channels, effectively reducing manufacturing costs and time. Even after the actuator head rotates relative to the handle, it can still enter the head via the interconnected connecting air groove, connecting groove, connecting hole, annular groove, and ventilation channel, thus providing a simplified and accurately positioned adjustable-angle power tool. Attached Figure Description

[0022] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0023] Figure 2 This is another perspective view of a preferred embodiment of the present invention.

[0024] Figure 3 This is a partial exploded perspective view of a preferred embodiment of the present invention.

[0025] Figure 4 This is an exploded perspective view of another part of a preferred embodiment of the present invention.

[0026] Figure 5 This is a cross-sectional side view of a preferred embodiment of the present invention.

[0027] Figure 6 For the preferred embodiment of the present invention, along Figure 5 A sectional side view of the AA-section line.

[0028] Figure 7 For the preferred embodiment of the present invention, along Figure 5 A sectional side view of the BB section line.

[0029] Figure 8 This is a schematic diagram of the operation of adjusting the angle in a cross-sectional side view according to a preferred embodiment of the present invention (already rotated).

[0030] Figure 9 This is a schematic diagram illustrating the operation of adjusting the angle according to a preferred embodiment of the present invention (already rotated).

[0031] Figure 10 This is a top view of a preferred embodiment of the present invention after the angle has been adjusted.

[0032] Figure 11 This is a three-dimensional cross-sectional view of a preferred embodiment of the present invention after the angle has been adjusted. Detailed Implementation

[0033] To gain a detailed understanding of the technical features and practical effects of the present invention, and to enable its implementation in accordance with the description, the preferred embodiments shown in the figures are further described in detail below:

[0034] This invention relates to an adjustable-angle power tool, a preferred embodiment of which is, for example... Figures 1 to 4 As shown, it includes a handle 10, an actuating head 20, and a positioning assembly 30, wherein:

[0035] like Figures 1 to 4 As shown, the handle 10 is provided with a receiving groove 11, a pivoting groove 12, and a locking seat 13. The receiving groove 11 extends laterally through the top of the handle 10 and faces the actuating head 20. The pivoting groove 12 is laterally recessed in the top of the handle 10 and communicates with the receiving groove 11. Preferably, the inner diameter of the pivoting groove 12 is larger than the inner diameter of the receiving groove 11, so that a step is formed between the pivoting groove 12 and the receiving groove 11. Furthermore, the handle 10 is provided with a housing 14 and a connecting head 15. The housing 14 is hollow and can be connected to a high-pressure air source. The connecting head 15 is as follows: Figure 5The top of the housing 14 is provided and communicated with the housing 14 via a locking base 16. The receiving groove 11 and the pivot groove 12 are formed on the coupling head 15. The locking base 13 is fixed to the pivot groove 12 and extends out of the coupling head 15. Preferably, the locking base 13 is provided with several locking fasteners 132 passing through the coupling head 15, and is fixedly engaged with the coupling head 15 via the several locking fasteners 132. The locking base 13 has several ring-shaped locking units 131 on one side adjacent to the pivot groove 12 and facing the actuating head 20. Preferably, each locking unit 131 is a tooth. The locking base 13 has an axial through-hole on the side away from the several locking units 131. The locking seat 13 has a connecting groove 133. The locking seat 13 has at least one connecting hole 134 radially penetrating its outer surface away from the plurality of locking units 131. The at least one connecting hole 134 is connected to the connecting groove 133. The locking seat 13 has an annular groove 135 recessed on its outer surface. The annular groove 135 is connected to the connecting groove 133 through the at least one connecting hole 134. Furthermore, the locking seat 13 has a limiting groove 136 recessed on its outer surface adjacent to the plurality of locking units 131, which is spaced apart from the annular groove 135. The connecting head 15 has a longitudinally arranged air groove 151 below the pivot groove 12. The air groove 151 is connected to the pivot groove 12 and the housing 14.

[0036] like Figure 3 and Figure 4As shown, the actuating head 20 is pivotally coupled to the handle 10. The actuating head 20 has a pivot seat 21 and a head 22. The pivot seat 21 is located at the bottom of the actuating head 20 and has an annular structure. The pivot seat 21 is pivotally coupled to the connecting head 15 of the handle 10. The pivot seat 21 has a connecting groove 211, a fitting hole 212, a vent 213, and several pivot bolts 214. The connecting groove 211 is laterally recessed on the side of the pivot seat 21 facing the connecting head 15. The portion of the locking seat 13 extending out of the connecting head 15 is accommodated in the connecting groove 211, so that the locking seat 13 is located between the pivot groove 12 of the connecting head 15 and the connecting groove 211 of the pivot seat 21. The fitting hole 212 is recessed in the pivot seat 21 away from the connecting head. The outer surface of the 15 is connected to the connecting groove 211. The vent 213 is formed longitudinally inside the pivot seat 21 and is connected to the annular groove 135 of the locking seat 13 via the connecting groove 211. The plurality of pivot bolts 214 are transversely inserted through the pivot seat 21 and are engaged with the limiting groove 136 of the locking seat 13, thereby pivotally engaging the pivot seat 21 with the connecting head 15. When the pivot seat 21 moves relative to the connecting head 15, the plurality of pivot bolts 214 can move in the limiting groove 136. The head 22 is located at the top of the actuating head 20 and is connected to the pivot seat 21. The head 22 is provided with components such as a cylinder, a rotor, and a steering assembly. The aforementioned components are the same as those in the prior art and will not be described here. The vent 213 is connected to the interior of the head 22.

[0037] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the positioning assembly 30 is disposed between the handle 10 and the actuating head 20 to fix the angle of the actuating head 20 relative to the handle 10. The positioning assembly 30 includes a positioning seat 31, an elastic element 32, and a lever element 33. The positioning seat 31 is rotatably and movablely disposed between the connecting head 15 of the handle 10 and the pivot seat 21 of the actuating head 20, and can selectively engage with the locking seat 13. The positioning seat 31 includes a connecting head 34, a positioning disc 35, and a linkage seat 36. The connecting head 34 includes... At one end of the positioning seat 31, located in the communicating groove 133 of the locking seat 13 and facing the pivot seat 21, the connector 34 is provided with a fixing hole 341 and a fixing member 342. The fixing hole 341 is axially recessed in the connector 34 and is straight opposite to the sleeve hole 212. The fixing member 342 is fixedly engaged with the fixing hole 341 on the side of the pivot seat 21 away from the connecting head 15 through the sleeve hole 212, so that the positioning seat 31 is fixedly engaged with the pivot seat 21 by the connector 34.

[0038] The positioning disk 35 is located in the middle section of the positioning seat 31 and is combined with the connector 34. The positioning disk 35 is movably disposed in the communication groove 133 of the locking seat 13. The positioning disk 35 has a positioning structure 351 on the side facing the locking seat 13 where a plurality of locking units 131 are provided. The positioning structure 351 can be locked and combined with each of the locking units 131 of the locking seat 13. Preferably, the positioning structure 351 is a gear that meshes with each of the teeth. The linkage seat 36 is located at the end of the positioning seat 31 away from the connector 34. The linkage seat 36 extends into the receiving groove 11 through the communication groove 133 and the pivot groove 12 of the locking seat 13. The linkage seat 36 has at least one sliding groove 361 on the side away from the connector 34. Preferably, the linkage seat 36 has a plurality of annularly spaced sliding grooves 361.

[0039] like Figures 2 to 5 As shown, the elastic member 32 is disposed in the communicating groove 133 of the locking seat 13 and sleeved on the outer surface of the connector 34 of the positioning seat 31 and abuts against the positioning disk 35. Preferably, the positioning assembly 30 is provided with an abutting ring 37 in the locking seat 13 that abuts against the elastic member 32, so that both ends of the elastic member 32 abut against the positioning disk 35 and the abutting ring 37 respectively. The lever 33 is rotatably engaged with the connecting head 15 of the handle 10 and abuts against the linkage seat 36 via the receiving groove 11. The side of the lever 33 facing the linkage seat 36 is provided with at least one protrusion 331. The at least one protrusion 331 can be selectively disposed in the at least one sliding groove 361 or abut against the outer side of the linkage seat 36, so that the positioning seat 31 moves relative to the locking member 13 and can rotate relative to the connecting head 15 as the lever 33 rotates.

[0040] Please refer to the following: Figure 5 and Figure 8 As shown, when the user wants to adjust the angle of the adjustable power tool of the present invention, the user rotates the lever 33 relative to the linkage seat 36 to make the at least one protrusion 341 disengage from the at least one sliding groove 361 and abut against the outer surface of the linkage seat 36 as the lever 341 rotates. At this time, the linkage seat 36, pushed by the at least one protrusion 341, will drive the positioning seat 31 to move relative to the coupling head 15, so that the positioning structure 351 of the positioning disk 35 separates from each of the locking units 131 of the locking seat 13, and compresses the elastic member 32 located between the positioning disk 35 and the abutment ring 37. Since the positioning seat 31 is no longer restricted by the locking seat 13, at this time... Figure 9As shown, the user can rotate the actuator 20 to change its angle relative to the handle 10 as needed. Since the pivot 21 is fixedly connected to the positioning seat 31, the pivot 21 rotates relative to the connecting head 15 as the positioning seat 31 moves, thereby allowing the actuator 20 to... Figure 8 The grip 10 is shown moving to the right.

[0041] like Figure 10 As shown, when the actuator 20 is rotated to the desired angle, the user can rotate the lever 33, causing at least one protrusion 331 to move from the outer side of the linkage seat 36 into the at least one sliding groove 361. At this time, the compressed elastic member 32 will push against the positioning plate 35, causing the positioning seat 31 to move towards the coupling head 15, so that the positioning structure 351 of the positioning plate 35 engages with each of the engaging units 131 of the engaging seat 13, thereby enabling the engagement through the engaging seat 13 and the positioning... The structural relationship between the base 31, the linkage base 36, and the lever 34 ensures a stable and accurate positioning of the angle between the actuator 20 and the handle 10, preventing the actuator 20 from swinging relative to the handle 10 during processing, which could damage the workpiece or endanger work safety. Furthermore, since the actuator 20 moves relative to the handle 10 along with the positioning base 31, it can rotate stably relative to the handle 10 during the adjustment of the swing angle.

[0042] For further details, please refer to the following: Figures 3 to 7 As shown, the adjustable-angle power tool of the present invention, by providing a connecting air groove 151 in the coupling head 15, a connecting groove 133 in the locking seat 13, at least one connecting hole 134, an annular groove 135, and a ventilation channel 213 in the pivot seat 21, allows high-pressure gas entering through the housing 14 to enter the head 22 of the actuating head 20 through the simplified configuration of the connecting air groove 151, connecting groove 133, connecting hole 134, annular groove 135, and ventilation channel 213, thereby driving the head 22 to process the workpiece. This eliminates the need for complex and difficult-to-process gas channels, effectively reducing manufacturing costs and time. Furthermore, even after the actuating head 20 rotates relative to the handle 10, it can still... Figure 11 As shown, the air enters the head 22 through the interconnected air groove 151, connecting groove 133, connecting hole 134, annular groove 135 and the air passage 213, thereby providing a power tool with a simplified structure and accurate positioning that can adjust the angle.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present invention without departing from the scope of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An adjustable-angle power tool, characterized in that, It includes a handle, an actuator head, and a positioning assembly, wherein: The handle is provided with a locking seat, which is fixed to the top of the handle and faces the actuating head. The locking seat has a connecting groove inside. The actuator is rotatably coupled to the handle and has a pivot seat and a head. The pivot seat is located at the bottom of the actuator and rotatably coupled to the handle, such that the locking seat is located between the top of the handle and the pivot seat. The head is located at the top of the actuator and connected to the pivot seat; and The positioning assembly is located between the handle and the actuating head and includes a positioning seat, an elastic element, and a lever. The positioning seat is rotatably and movablely mounted on the handle and can engage with the locking seat. The elastic element is located in the communicating groove of the locking seat and abuts against the positioning seat, pushing the positioning seat to engage with the locking seat. The lever is rotatably mounted on the top of the handle and abuts against one side of the positioning seat. When the lever rotates relative to the positioning seat, it causes the positioning seat to separate from the locking seat and compresses the elastic element. The angle of the actuating head relative to the handle can be adjusted by rotating the pivot relative to the handle. After adjustment, the compressed elastic element causes the positioning seat to move toward the locking seat and engage with it for positioning. The positioning seat has at least one sliding groove on its outer side, and the lever has at least one protrusion on one side facing the positioning seat. The at least one protrusion can be disposed in the at least one sliding groove or abut against the outer side of the positioning seat, so that the positioning seat separates from the locking seat as the lever rotates. The positioning seat is provided with a connector, a positioning plate and a linkage seat. The connector is located at one end of the positioning seat and is situated in the communicating groove of the locking seat and facing the pivot seat. The connector is fixedly engaged with the pivot seat. The positioning plate is located in the middle section of the positioning seat and is engaged with the connector. The positioning plate is movably disposed in the communicating groove of the locking seat and can be engaged with the locking seat. The linkage seat is located at the end of the positioning seat away from the connector. The at least one sliding groove of the positioning seat is located on the side of the linkage seat away from the positioning plate.

2. The adjustable-angle power tool as described in claim 1, characterized in that, The pivot seat is provided with a fitting hole, which is recessed on the outer surface of the pivot seat away from the handle. The connector is provided with a fixing hole and a fixing member. The fixing hole is axially recessed in the connector and is straight and opposite to the fitting hole. The fixing member is fixedly engaged with the fixing hole on the side of the pivot seat away from the handle through the fitting hole, so that the positioning seat is fixedly engaged with the pivot seat through the connector.

3. The adjustable-angle power tool as described in claim 2, characterized in that, The handle has a receiving groove and a pivoting groove. The receiving groove extends laterally through the top of the handle and faces the actuating head. The pivoting groove is recessed in the top of the handle and communicates with the receiving groove. The locking seat is fixed in the pivoting groove. The linkage seat extends into the receiving groove through the communicating groove of the locking seat and the pivoting groove.

4. The adjustable-angle power tool as described in claim 3, characterized in that: The handle has a housing and a connecting head. The connecting head is located on the top of the housing and is connected to the housing. The receiving groove and the pivoting groove are formed on the connecting head. The connecting head has a longitudinally arranged air groove below the pivoting groove. The air groove is connected to the pivoting groove and the housing. The mounting base has at least one through-hole radially penetrating its outer surface, the at least one through-hole communicating with the through-groove; the mounting base also has an annular groove recessed on its outer surface, the annular groove communicating with the through-groove via the at least one through-hole; and The pivot seat is provided with a connecting groove and a vent. The connecting groove is laterally recessed on the side of the pivot seat facing the connecting head. The locking seat extends out of the connecting head and is accommodated in the connecting groove. The vent is longitudinally formed inside the pivot seat and communicates with the annular groove of the locking seat through the connecting groove.

5. The adjustable-angle power tool as described in claim 4, characterized in that, The mounting base has several ring-shaped mounting units arranged in a circular pattern facing the actuating head on one side of the mounting base adjacent to the pivot groove. The positioning disk has a positioning structure on the side facing the mounting base with several mounting units. The positioning structure can be engaged with each of the mounting units of the mounting base.

6. The adjustable-angle power tool as described in claim 5, characterized in that, The locking seat has a limiting groove recessed on the outer surface of the adjacent locking units, which is spaced apart from the annular groove. The pivot seat has several pivot bolts, which are transversely inserted through the pivot seat and combined with the limiting groove of the locking seat, thereby pivotally connecting the pivot seat and the connecting head.

7. The adjustable-angle power tool as described in claim 6, characterized in that, The positioning seat has several annularly spaced sliding slots on the linkage seat.

8. The adjustable-angle power tool as described in claim 7, characterized in that, The elastic element is sleeved on the outer surface of the connector of the positioning seat and abuts against the positioning plate. The positioning assembly has a stop ring in the locking seat that abuts against the elastic element, so that the two ends of the elastic element abut against the positioning plate and the stop ring respectively.

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