An elastic limiting and anti-slip device for impact tools

Abstract

This utility model discloses an elastic limiting and anti-slip device for impact tools, including a rod body, an impact head disposed on the front side of the rod body, and a connector disposed on the rear side of the rod body. A retaining step is fixed externally at the connection between the rod body and the impact head. A helical compression spring is disposed on the rear external side of the impact head, and a retaining groove is annularly formed on the rear side of the impact head. A limiting retaining ring is disposed on the inner side of the groove. The device uses the helical compression spring to drive a bottomless sleeve to extend forward by default, forming an annular limiting area around the striking surface at the end of the impact head, which can directly surround the head of the workpiece. This structure can effectively resist the high-frequency vibration during pneumatic tool operation, laterally constrain the relative position of the impact head and the workpiece, and prevent the impact head from slipping off the workpiece surface. This prevents impact deviation caused by displacement, significantly improving operational accuracy, and reduces the impact on the operator's hand or scratches on the workpiece surface when the tool slips, eliminating safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of impact tool technology, specifically to an elastic limiting and anti-slip device for impact tools. Background Technology

[0002] The high-frequency vibrations generated by pneumatic impact tools during operation can make it difficult for the operator to hold them steadily, causing the impact rod head to slip off the surface of the workpiece (such as a nail). This not only significantly reduces work efficiency and damages the workpiece surface, but also poses a safety hazard.

[0003] In the existing technology, there is a lack of a solution that is simple in structure, can effectively guide and limit the movement without interfering with the final strike effect. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects and provide an adaptive anti-slip limiting device integrated into the head of the impact rod, which can automatically limit the movement during operation and automatically disengage upon completion.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an elastic limiting and anti-slip device for an impact tool, comprising a rod body, an impact head disposed on the front side of the rod body, and a connector disposed on the rear side of the rod body; a retaining step is fixed externally at the connection between the rod body and the impact head, a helical compression spring is disposed on the rear external side of the impact head, a retaining groove is annularly opened on the rear side of the impact head, and a limiting retaining ring is disposed on the inner side of the retaining groove; The helical compression spring is provided with a bottomless sleeve on its outside, and an annular bearing shoulder is provided at the inner rear side of the bottomless sleeve where it contacts the front end of the helical compression spring.

[0006] Preferably, the helical compression spring is connected to the impact head via a sleeve connection, and the rear end of the helical compression spring abuts against a retaining step, the diameter of which is larger than the diameter of the rod, the impact head, and the helical compression spring.

[0007] Preferably, the limiting ring is connected to the slot via a nested connection, and the inner diameter of the limiting ring is smaller than the outer diameter of the impact head. When set in the slot, it abuts against the annular bearing shoulder and performs limiting.

[0008] Preferably, the annular bearing shoulder and the bottomless sleeve are fixedly connected. The bottomless sleeve is axially positioned between the limiting ring and the locking step via the annular bearing shoulder, and can move back and forth by compressing the spiral spring.

[0009] Preferably, under the action of the helical compression spring, the bottomless sleeve tends to move towards the head.

[0010] Preferably, under the elastic force of the helical compression spring, the foremost end of the bottomless sleeve extends beyond the end striking surface of the impact head.

[0011] Compared with the prior art, this utility model provides an elastic limiting and anti-slip device for impact tools, which has the following beneficial effects: 1. The device uses a helical compression spring to drive the bottomless sleeve to extend forward by default, forming an annular limiting area around the striking surface of the impact head, which can directly surround the head of the workpiece. This structure can effectively resist the high-frequency vibration of pneumatic tools during operation, and laterally constrain the relative position of the impact head and the workpiece, preventing the impact head from slipping off the workpiece surface. This not only prevents impact deviation caused by displacement, greatly improving the accuracy of operation, but also reduces the impact on the operator's hand or the scratch on the workpiece surface when the tool slips, eliminating safety hazards.

[0012] 2. The device achieves fixation by installing a limiting retaining ring and a retaining-step load-bearing helical compression spring within the annular groove of the impact head. This eliminates the need for destructive modifications such as welding or drilling to the original impact tool's shaft or impact head structure, representing a standard parts assembly method. On one hand, it is compatible with various models of pneumatic impact tools such as air hammers and jackhammers, offering a wide range of compatibility. On the other hand, if subsequent replacements of components such as the helical compression spring or bottomless sleeve are required, only the limiting retaining ring needs to be removed, simplifying maintenance and reducing operating costs.

[0013] 3. The device adopts an elastic, self-adaptive structure. In the initial stage of operation, the bottomless sleeve extends forward and is limited. As the workpiece is about to be driven into place, the base surface contacts the bottomless sleeve, causing it to retract towards the tail end against the spring force, until the sleeve end is level with or slightly lower than the impact surface of the impact head. This design ensures that during the final workpiece installation stage, the sleeve will not obstruct the impact head's striking action, thus not affecting the workpiece's driving depth or causing protrusions or depressions on the base surface due to sleeve interference, guaranteeing the surface flatness and installation quality of the workpiece after installation.

[0014] 4. The core components of the device are all made of metal mechanical parts, possessing excellent impact resistance and wear resistance. In harsh working environments with high dust and vibration, such as construction and machinery maintenance, it is not easily deformed or damaged by high-frequency impacts or environmental factors, has a long service life, and can stably perform its anti-slip limiting function for a long time, reducing the frequency of frequent component replacements and improving the overall working efficiency of the tool. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the device in this utility model.

[0016] Figure 2 In this utility model Figure 1 A schematic diagram showing the bottomless sleeve and the limiting retaining ring after separation.

[0017] Figure 3 In this utility model Figure 2 A schematic diagram of the structure from a tilted perspective.

[0018] Figure 4 This is a structural schematic diagram of the cross-section of the device in this utility model.

[0019] In the diagram: 1. Insertion end; 2. Rod body; 3. Impact head; 4. Snap-on step; 5. Helical compression spring; 6. Snap-on groove; 7. Limiting snap ring; 8. Bottomless sleeve; 9. Annular bearing shoulder. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides, for example Figure 1-4 The invention relates to an elastic limiting and anti-slip device for impact tools. The core of this invention is to use the elastic force of the helical compression spring 5, combined with the axially sliding structure of the bottomless sleeve 8, to achieve automatic limiting during impact operations and automatic disengagement after completion. This solves the problem of tool vibration and slippage without interfering with the final impact effect.

[0022] The main supporting structure of this impact tool's elastic limiting anti-slip device includes a rod 2, an impact head 3, and a connector 1. The three are integrated or fixed by welding or threaded connection. The connector 1 is used to adapt and connect to the power output end of the pneumatic impact tool to ensure stable power transmission during tool operation. One end of the impact head 3 is the striking surface, which is made of high-hardness alloy material to meet the wear resistance and impact resistance requirements of high-frequency impact operations and to avoid deformation of the striking surface after long-term use, which would affect the accuracy of operation.

[0023] At the connection between the rod 2 and the impact head 3, a radially protruding retaining step 4 is formed by turning. The retaining step 4 is an integral structure with the rod 2 and the impact head 3. Its outer diameter is larger than the outer diameter of the rod 2, the outer diameter of the impact head 3, and the inner diameter of the subsequently assembled helical compression spring 5, so that the retaining step 4 can form a reliable axial support surface to limit the rear displacement of the helical compression spring 5.

[0024] The helical compression spring 5 is made of spring steel, and its inner diameter is larger than the outer diameter of the impact head 3. During assembly, the helical compression spring 5 is inserted from the front end of the impact head 3 and slid backward along the axial direction of the impact head 3 until the rear end face of the helical compression spring 5 is completely in contact with the front end face of the step 4. At this time, the helical compression spring 5 is in a naturally extended state, and a certain distance is reserved between its front end and the front end face of the impact head 3 to reserve space for the subsequent assembly and sliding of the bottomless sleeve 8.

[0025] On the rear outer circumferential surface of the impact head 3, a groove 6 is formed by annular milling. The cross-section of the groove 6 is rectangular and matches the thickness of the limiting ring 7. The limiting ring 7 is an elastic retaining ring with an inner diameter smaller than the outer diameter of the impact head 3. During assembly, the limiting ring 7 is radially opened by a tool, inserted into the groove 6, and then the tool is released. The limiting ring 7 automatically springs back to its original position and is tightly engaged in the groove 6. The inner circumferential surface of the limiting ring 7 is flush with the groove 6 of the impact head 3, while the outer circumferential surface protrudes from the outer circumferential surface of the impact head 3, forming a limiting structure for restricting the displacement of the front end of the bottomless sleeve 8.

[0026] The bottomless sleeve 8 is made of low carbon steel by stretching and turning. Its inner diameter is larger than the outer diameter of the helical compression spring 5, ensuring that the bottomless sleeve 8 can slide smoothly along the axial direction of the helical compression spring 5. On the inner side wall of the bottomless sleeve 8, there is a radial protrusion structure formed by turning, which is the annular bearing shoulder 9 located on the rear side. The two are integrated with the bottomless sleeve 8.

[0027] The inner diameter of the annular bearing shoulder 9 is smaller than the outer diameter of the spiral compression spring 5. During assembly, the bottomless sleeve 8 is inserted from the front end of the impact head 3 and slides axially backward until the rear end face of the annular bearing shoulder 9 is in contact with the front end face of the spiral compression spring 5. At this time, the spiral compression spring 5 is in a slightly compressed state under the pressure of the annular bearing shoulder 9, ensuring that there is no gap between the annular bearing shoulder 9 and the spiral compression spring 5, and preventing the bottomless sleeve 8 from shaking when the tool is idle.

[0028] The inner diameter of the annular bearing shoulder 9 is smaller than the outer diameter of the limiting ring 7. When the bottomless sleeve 8 is assembled in place, the front end face of the annular bearing shoulder 9 fits against the rear end face of the limiting ring 7.

[0029] In this embodiment, when the device is not in contact with the workpiece, the helical compression spring 5 is in a slightly compressed state. Its elastic force pushes the annular bearing shoulder 9, causing the bottomless sleeve 8 to move axially toward the head of the impact head 3. The front end face of the annular bearing shoulder 9 is in contact with the rear end face of the limiting ring 7. At this time, the bottomless sleeve 8 reaches the default position (the default position is the position of the impact head 3 when the annular bearing shoulder 9 and the limiting ring 7 are in contact). In this position, the front end face of the bottomless sleeve 8 extends 3-5mm beyond the end striking surface of the impact head 3. The inner sidewall of the bottomless sleeve 8 forms an annular limiting area around the striking surface. The inner diameter of this area is larger than the outer diameter of common workpieces, which can constrain the head of the workpiece within the limiting area and prevent the impact head 3 from slipping off the workpiece surface due to high-frequency vibration when the tool is started.

[0030] Preferably, the operator connects the device to the pneumatic impact tool via the connector 1. After starting the tool, the impact head 3 generates a high-frequency axial impact motion, applying a striking force to the workpiece. Since the workpiece is constrained within the annular limiting area formed by the bottomless sleeve 8, the striking surface of the impact head 3 is always aligned with the top of the workpiece and will not be radially offset due to vibration, which greatly improves the striking accuracy and avoids damage such as scratches and dents on the workpiece surface due to impact offset.

[0031] As the workpiece is gradually driven into the base, when the distance between the top of the workpiece and the surface of the base is less than the length of the bottomless sleeve 8 beyond the striking surface of the impact head 3, the surface of the base will contact the front end face of the bottomless sleeve 8. As the workpiece continues to be struck, the surface of the base applies a backward axial force to the bottomless sleeve 8. This force overcomes the elastic force of the helical compression spring 5, causing the bottomless sleeve 8 to move axially toward the tail of the rod 2, and the helical compression spring 5 is further compressed. Until the workpiece is driven into the base, the front end face of the bottomless sleeve 8 is in contact with the surface of the base. At this time, the front end face of the bottomless sleeve 8 is level with or slightly lower than the end striking surface of the impact head 3, which will not hinder the final striking action of the impact head 3 on the workpiece, ensuring that the driving depth of the workpiece meets the requirements, and that the surface of the base will not bulge or dent due to the interference of the bottomless sleeve 8, thus ensuring the surface flatness after the operation.

[0032] After the workpiece is installed, the operator removes the device from the base surface. The axial force of the base surface on the bottomless sleeve 8 disappears. Under the action of the elastic restoring force, the helical compression spring 5 pushes the annular bearing shoulder 9, causing the bottomless sleeve 8 to move axially towards the head of the impact head 3 until the annular bearing shoulder 9 fits with the limiting ring 7 and returns to the default position, preparing for the next impact operation.

[0033] Preferably, under the elastic force of the helical compression spring 5, the bottomless sleeve 8 is continuously pushed towards the head of the impact head 3. When its annular bearing shoulder 9 abuts against the limiting retaining ring 7, it reaches the default position. At this time, the foremost end of the bottomless sleeve 8 extends beyond the end impact surface of the impact head 3, and its inner wall forms a closed annular limiting area around the impact surface. This area can directly surround the head of the workpiece, constraining the relative position of the workpiece and the impact head 3 in the lateral direction, preventing the impact head 3 from slipping laterally off the workpiece surface due to high-frequency vibration when the impact tool is started, thus achieving pre-positioning before operation.

[0034] During operation, high-frequency vibrations generate a lateral force that causes the impact head 3 to deviate from the workpiece. However, the helical compression spring 5 consistently applies a forward elastic force to the bottomless sleeve 8, ensuring that the annular limiting area of ​​the bottomless sleeve 8 remains in contact with the head of the workpiece, thus constraining the relative position of the workpiece and the impact head 3 in the lateral direction. As the workpiece is driven into and approaches the substrate surface, the front end of the bottomless sleeve 8 gradually adheres to the substrate surface, further forming a stable lateral constraint and preventing the impact head from slipping off.

[0035] When the workpiece is about to be driven into place, the surface of the substrate on which the workpiece is located will contact the front end of the bottomless sleeve 8 and apply a backward force to overcome the spring force, pushing the bottomless sleeve 8 to retract towards the tail of the impact head 3 until the end of the bottomless sleeve 8 is level with or slightly lower than the striking surface of the end of the impact head 3. During this process, the annular limiting area of ​​the bottomless sleeve 8 always plays a lateral positioning role before retraction, avoiding lateral displacement of the workpiece due to vibration at the end of driving; after retraction, it will not interfere with the final impact of the impact head 3 on the workpiece, thus ensuring the continuity of anti-slip positioning and not affecting the installation quality of the workpiece.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An elastic limiting anti-slip device for an impact tool, comprising a rod (2), an impact head (3) disposed on the front side of the rod (2), and a connector (1) disposed on the rear side of the rod (2). characterized in that A retaining step (4) is fixed to the outside of the connection between the rod (2) and the impact head (3). A spiral compression spring (5) is provided on the rear side of the impact head (3). A retaining groove (6) is provided on the rear side of the impact head (3). A limit retaining ring (7) is provided on the inner side of the retaining groove (6). The helical compression spring (5) is provided with a bottomless sleeve (8) on its outside, and an annular bearing shoulder (9) is provided at the contact point between the inner rear side of the bottomless sleeve (8) and the front end of the helical compression spring (5).

2. The elastic position-limiting anti-slip device for impact tools according to claim 1, characterized in that: The helical compression spring (5) is connected to the impact head (3) by a sleeve connection, and the rear end of the helical compression spring (5) abuts against the step (4). The diameter of the step (4) is larger than the diameter of the rod (2), the impact head (3), and the helical compression spring (5).

3. The elastic position-limiting anti-slip device for impact tools according to claim 2, characterized in that: The limiting ring (7) is connected to the slot (6) by a nested connection method, and the inner diameter of the limiting ring (7) is smaller than the outer diameter of the impact head (3). When it is set in the slot (6), it abuts against the annular bearing shoulder (9) and performs limiting.

4. The elastic position-limiting anti-slip device for impact tools according to claim 3, characterized in that: The annular bearing shoulder (9) and the bottomless sleeve (8) are fixedly connected. The bottomless sleeve (8) is axially positioned between the limiting ring (7) and the locking step (4) through the annular bearing shoulder (9), and can move back and forth by compressing the spiral spring (5).

5. The elastic position-limiting anti-slip device of the impact tool according to claim 4, characterized in that: Under the elastic force of the helical compression spring (5), the bottomless sleeve (8) tends to move towards the head.

6. The elastic position-limiting anti-slip device of the impact tool according to claim 5, characterized in that: Under the elastic force of the helical compression spring (5), the front end of the bottomless sleeve (8) extends beyond the end striking surface of the impact head (3).

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