Axial direct-acting tap wrench handle mechanism
The axial direct-acting tap wrench handle mechanism utilizes the cooperation of a pin and a spring to achieve rapid and reliable tap clamping, solving the problems of complex clamping and cumbersome operation of traditional tap wrenches, and improving efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI BAOCHENG AVIATION INSTR
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional tap wrenches have a cumbersome clamping process, are difficult to operate, have unstable clamping, are inefficient, and have a large gap between the moving jaw and the wrench body, making it difficult to align quickly.
The axial linear action tap wrench handle mechanism uses the rotating wrench end cap to drive the movable rod linearly. With the cooperation of the pin and spring, it can quickly clamp and release the tap, ensuring that the movable rod only moves axially and does not rotate. The structure is simple and suitable for taps of various sizes.
It achieves fast and reliable tap clamping, simplifies the operation process, improves clamping efficiency, reduces production costs, has a wide range of applications, avoids the risk of slippage, and has good clamping stability.
Smart Images
Figure CN224526158U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical clamping tool technology, specifically relating to an axial direct-acting tap wrench handle mechanism. Background Technology
[0002] A tap is a common tool for machining internal threads, and it usually requires a tap wrench (or tap lever) to hold and transmit torque. Traditional tap wrenches typically use a fixed jaw and a movable jaw driven by a screw to hold the square end of the tap. During operation, the screw is rotated to move the movable jaw, thus clamping and releasing the tap.
[0003] This traditional structure has several drawbacks: First, the clamping process is cumbersome, requiring multiple rotations of the screw to achieve clamping, resulting in low efficiency. Second, there is a large clearance between the moving jaw and the wrench body, and it is prone to deflection during movement, making it difficult to quickly and accurately align the V-groove of the moving jaw with the square tail of the tap, often requiring manual adjustment, which is inconvenient. Furthermore, in the clamped state, if the moving jaw fails to fully engage with the square tail of the tap, uneven force may cause the tap to slip or be damaged during tapping, affecting machining quality and operational safety.
[0004] Therefore, there is an urgent need for a tap wrench clamping mechanism that is simple in structure, quick to operate, has good centering, and reliable clamping. Utility Model Content
[0005] The technical problem solved by this utility model is to provide an axially direct-acting tap wrench handle mechanism. This utility model addresses the problems of complex clamping process, cumbersome operation, difficult alignment, and low efficiency of existing tap wrenches. It proposes a wrench handle mechanism that is simple in structure, easy to operate, reliable in clamping, and can quickly align and clamp the tap. The core of this mechanism is to linearly push a limited movable rod through a rotating end cap to achieve a fast and direct clamping action.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An axially direct-acting tap wrench handle mechanism includes: a wrench frame, a movable rod, a pin, a wrench end cap, and a spring; The main body of the wrench frame is a long cylindrical shape, with a teardrop-shaped through hole for accommodating a tap opened along the axial direction at its center. One end of the wrench frame is a handle, and the end face of the handle is provided with a cylindrical through hole that communicates with the teardrop-shaped through hole. The outer circular surface of the handle is machined with external threads, and at least one elongated through groove is opened along the radial direction at its end. The movable rod is cylindrical, and its outer circle forms a clearance sliding fit with the cylindrical through hole of the wrench holder. A radial pin hole is provided in the middle of the movable rod. The front end of the movable rod is used to clamp the tail of the tap, and the rear end is provided with a limiting step with a slightly larger diameter. The outer circle of the pin and the pin hole of the movable rod form an interference fit, and the two ends of the pin extend out of the pin hole and are slidably set in the through groove of the wrench frame; The spring is sleeved on the movable rod and is located between the limiting step of the movable rod and the handle end face of the wrench holder; The wrench end cap has a threaded hole at its center that mates with the external thread of the wrench holder handle. The wrench end cap is connected to the external thread of the wrench holder through the threaded hole, and its inner end face is opposite to or in contact with the end of the movable rod.
[0007] As a further limitation of the above scheme, the wrench holder has two through slots, which are symmetrically opened at the ends of the handle.
[0008] As a further limitation of the above scheme, the front end of the movable rod is machined with a notch for clamping the tail of the tap, and the notch is a 90° V-shaped notch.
[0009] Further defining the above solution, the outer surface of the wrench end cap is cylindrical, and the front end of the threaded hole of the wrench end cap is machined with a stepped hole of a larger diameter. The diameter of the stepped hole is larger than the outer diameter of the handle of the wrench frame, forming a receiving part.
[0010] As a further limitation of the above scheme, the free length of the spring is greater than the length of the through slot of the wrench holder.
[0011] As a further specification of the above scheme, the wrench frame, movable rod, pin, and wrench end cap are all made of tool steel.
[0012] As a further limitation of the above scheme, the spring is made of spring steel.
[0013] As a further limitation of the above scheme, the larger end of the teardrop-shaped through hole faces one end of the handle on the wrench holder.
[0014] Advantages of this utility model compared to the prior art: 1. This solution is extremely easy to operate: simply rotate the end cap of the wrench to directly drive the movable rod forward and backward, thereby clamping and releasing the tap. The action is continuous and fast, which greatly improves clamping efficiency and saves operation time. 2. This design offers excellent centering and reliable clamping: The movable rod engages with the through slot of the wrench holder via a pin, strictly limiting its movement to axial motion and preventing rotation. This ensures that the notch at the front end of the movable rod always maintains the correct relative position with the teardrop hole on the wrench holder body, thus automatically and accurately aligning and clamping the square tail of the tap. This avoids the hassle of manual adjustment and eliminates the risk of slippage due to misalignment, resulting in more stable and reliable clamping. 3. This solution has a simple and compact structure and low cost: the entire mechanism consists of only five main parts: wrench frame, movable rod, pin, spring and wrench end cap. The structure is very simple, easy to process and manufacture, and easy to assemble, which helps to reduce production costs. 4. This solution is highly versatile: by changing the size of the center hole and the movable rod of the wrench holder, it can be adapted to clamp various taps of different specifications, making it widely applicable; 5. This solution has a built-in reset function: the spring design allows the movable rod to automatically reset when the wrench end cap is loosened, making it easier to remove the tap and making the operation smoother. Attached Figure Description
[0015] Figure 1 This is a front view of the entire assembled version of this utility model; Figure 2 This is a cross-sectional view of the entire assembly of this utility model; Figure 3 This is a three-dimensional exploded view of the components of this utility model; Figure 4 This is a front view showing the exploded structure of each component of this utility model; Figure 5 This is a top view showing the exploded structure of each component of this utility model; Figure 6 This is a schematic diagram of the structure of the wrench frame in this utility model; Figure 7 This is a cross-sectional view of the wrench frame in this utility model; Figure 8 This is a schematic diagram of the movable rod in this utility model; Figure 9 This is a cross-sectional view of the movable rod in this utility model; Figure 10 This is a schematic diagram of the pin structure in this utility model; Figure 11 This is a schematic diagram of the structure of the wrench end cap in this utility model; Figure 12 This is a cross-sectional view of the wrench end cap in this utility model; Figure 13 This is a schematic diagram of the spring structure in this utility model.
[0016] (Diagram labels: 1-Wrench holder, 1-1-Teardrop-shaped through hole, 1-2-Cylindrical through hole, 1-3-External thread, 1-4-Through groove; 2-Modular rod, 2-1-Pin hole, 2-2-Limiting step; 3-Pin; 4-Wrench end cap, 4-1-Threaded hole; 5-Spring). Detailed Implementation
[0017] 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 scope of protection of the present utility model.
[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0020] Please see Figure 1-13 The embodiments of this utility model are described in detail below.
[0021] Example: See Figure 1-5 As shown, this embodiment provides an axially direct-acting tap wrench handle mechanism, including: a wrench frame 1, a movable rod 2, a pin 3, a wrench end cap 4, and a spring 5.
[0022] See Figure 6 , Figure 7As shown, the main body of the wrench holder 1 is a long cylindrical shape and is the main body of the entire structure. A teardrop-shaped through hole 1-1 is opened along the axial direction at its center to accommodate and position the tail end of the tap. One end of the wrench holder 1 is a handle. The end face of the handle is provided with a cylindrical through hole 1-2 that communicates with the teardrop-shaped through hole 1-1 to guide the movable rod 2 to make precise axial movements. An external thread 1-3 is machined on the outer circular surface of the handle. At least one elongated through groove 1-4 is opened along the radial direction at its end. The through groove 1-4 is used to limit the movement trajectory of the pin 3 and the movable rod 2. The large end of the teardrop-shaped through hole 1-1 faces one end of the handle on the wrench holder 1.
[0023] Preferably, the through slots 1-4 of the wrench holder 1 are two, symmetrically opened at the ends of the handle.
[0024] See Figure 2 , Figure 8 , Figure 9 As shown, the movable rod 2 is the clamping actuator, and is cylindrical. Its outer circle forms a clearance sliding fit with the cylindrical through hole 1-2 of the wrench holder 1. The middle part of the movable rod 2 is provided with a radial pin hole 2-1 for fixing the pin 3. The front end of the movable rod 2 is used to clamp the tail of the tap, and the rear end is provided with a limiting step 2-2 with a slightly larger diameter. The limiting step 2-2 is used to limit the installation position of the spring 5 on the one hand, and on the other hand, when in the loosened state, it contacts the inner end face of the wrench end cover 4 to limit the maximum return position of the movable rod 2.
[0025] Preferably, the front end of the movable rod 2 is machined with a notch for clamping the tail of the tap, and the notch is a 90° V-shaped notch.
[0026] See Figure 2 , Figure 10 As shown, the outer circle of the pin 3 forms an interference fit with the pin hole 2-1 of the movable rod 2, and both ends of the pin 3 extend out of the pin hole 2-1 and are slidably disposed in the through groove 1-4 of the wrench frame 1.
[0027] The pin 3 plays a crucial role. It is fixed to the movable rod 2 by an interference fit with the pin hole 2-1 on the movable rod 2, while also being able to slide within the through groove 1-4 of the wrench holder 1. This design cleverly converts the rotational motion of the wrench end cap 4 into the pure linear motion of the movable rod 2, and completely eliminates the possibility of the movable rod 2 rotating on its own.
[0028] See Figure 2 , Figure 13As shown, the spring 5 is sleeved on the movable rod 2 and located between the limiting step 2-2 of the movable rod 2 and the handle end face of the wrench holder 1. In this structure, the spring 5, sleeved on the movable rod 2, is always in a compressed state. Its function is to provide the elastic force to reset the movable rod 2. When the wrench end cap 4 is rotated counterclockwise to retract it, the elastic force of the spring 5 will push the movable rod 2 to retract together, thereby releasing the tap.
[0029] Preferably, the free length of the spring 5 is greater than the length of the through slot 1-4 of the wrench holder 1.
[0030] See Figure 2 , Figure 11-12 As shown, the wrench end cap 4 has a threaded hole 4-1 at its center that mates with the external thread 1-3 of the handle of the wrench frame 1. The wrench end cap 4 is connected to the external thread 1-3 of the wrench frame 1 through the threaded hole 4-1, and its inner end face is opposite to or in contact with the end of the movable rod 2. In this structure, the wrench end cap 4 is the operating component of the mechanism. By rotating it, its inner end face directly pushes against the end of the movable rod 2, overcoming the spring force and pushing the movable rod 2 forward to complete the clamping action.
[0031] Preferably, the outer surface of the wrench end cap 4 is cylindrical, and the front end of the threaded hole 4-1 of the wrench end cap 4 is machined with a stepped hole with a larger diameter. The diameter of the stepped hole is larger than the outer diameter of the handle of the wrench frame 1, forming a receiving part.
[0032] Preferably, the wrench holder 1, movable lever 2, pin 3, and wrench end cap 4 are all made of tool steel. The spring 5 is made of spring steel. The size of each component is adjusted according to the size of the tap actually used.
[0033] During installation: First, thread the spring 5 onto the movable rod 2, then thread the movable rod 2 into the cylindrical through hole 1-2 at one end of the wrench holder 1. At the same time, thread the pin 3 through the through groove 1-4 on the wrench holder 1 and the pin hole 2-1 on the movable rod 2. Through the small interference fit between the outer circle of the pin 3 and the pin hole 2-1 of the movable rod, the pin 3 and the movable rod 2 are fixed together. At the same time, the through groove 1-4 on the wrench holder 1 limits the position of the assembly of the pin 3 and the movable rod 2.
[0034] Working principle: When clamping the tap: Insert the square end of the tap into the teardrop-shaped through hole 1-1 of the wrench holder 1. Rotate the wrench end cap 4 clockwise. The wrench end cap 4 screws inward, and its inner end face pushes the end of the movable rod 2. The movable rod 2 moves forward against the elastic force of the spring 5. The pin 3, which is fixed to the movable rod 2, slides forward along the through groove 1-4 on the wrench holder 1, ensuring that the movable rod 2 only moves and does not rotate. The 90° notch at the front end of the movable rod 2 moves forward until its two inclined surfaces are tightly fitted with the two sides of the square end of the tap, locking it in place. At this time, the pin 3 moves to the front end of the through groove 1-4, and the spring 5 is further compressed. This clamping mechanism has low manufacturing cost, improves the clamping efficiency of the tap, is highly versatile, and is suitable for clamping various taps, with a wide range of applications.
[0035] When disassembling the tap: Rotate the wrench end cap 4 counterclockwise. The wrench end cap 4 will unscrew outwards, releasing its pushing force on the movable rod 2. The compressed spring 5 will release its elasticity, pushing the limit step 2-2 on the movable rod 2, causing the movable rod 2 to move backwards and reset. The notch at the front end of the movable rod 2 will disengage from the square tail of the tap, and the tap will be loosened and removed. The pin 3 will slide back to its initial position along the through groove 1-4.
[0036] Throughout the process, the movable rod 2 only moves axially, without radial oscillation or circumferential rotation, thus enabling it to quickly and accurately align with the square tail of the tap and achieve reliable clamping.
[0037] This utility model has a simple structure, is easy to operate, has reliable clamping, and can quickly align and clamp the tap, solving the problems of complex clamping process, troublesome operation, difficult alignment, and low efficiency of existing tap wrenches.
[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An axially direct-acting tap wrench handle mechanism, characterized in that: include: Wrench holder (1), movable rod (2), pin (3), wrench end cap (4) and spring (5); The main body of the wrench frame (1) is a long cylindrical shape, and a teardrop-shaped through hole (1-1) for accommodating a tap is provided in the center along the axial direction. One end of the wrench frame (1) is a handle. The end face of the handle is provided with a cylindrical through hole (1-2) that communicates with the teardrop-shaped through hole (1-1). External threads (1-3) are machined on the outer circular surface of the handle, and at least one long strip-shaped through groove (1-4) is provided in the radial direction at its end. The movable rod (2) is cylindrical, and its outer circle forms a clearance sliding fit with the cylindrical through hole (1-2) of the wrench frame (1). The middle part of the movable rod (2) is provided with a radial pin hole (2-1). The front end of the movable rod (2) is used to clamp the tail of the tap, and the rear end is provided with a slightly larger diameter limiting step (2-2). The outer circle of the pin (3) forms an interference fit with the pin hole (2-1) of the movable rod (2), and the two ends of the pin (3) extend out of the pin hole (2-1) and are slidably set in the through groove (1-4) of the wrench frame (1); The spring (5) is sleeved on the movable rod (2) and is located between the limiting step (2-2) of the movable rod (2) and the handle end face of the wrench frame (1); The wrench end cap (4) has a threaded hole (4-1) at its center that matches the external thread (1-3) of the handle of the wrench frame (1). The wrench end cap (4) is connected to the external thread (1-3) of the wrench frame (1) through the threaded hole (4-1), and its inner end face is opposite to or in contact with the end of the movable rod (2).
2. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The wrench holder (1) has two through slots (1-4), which are symmetrically opened at the ends of the handle.
3. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The front end of the movable rod (2) is machined with a notch for clamping the tail of the tap, and the notch is a 90° V-shaped notch.
4. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The outer surface of the wrench end cap (4) is cylindrical. The front end of the threaded hole (4-1) of the wrench end cap (4) is machined with a stepped hole with a larger diameter. The diameter of the stepped hole is larger than the outer diameter of the handle of the wrench frame (1), forming a receiving part.
5. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The free length of the spring (5) is greater than the length of the through slot (1-4) of the wrench holder (1).
6. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The wrench frame (1), movable rod (2), pin (3) and wrench end cap (4) are all made of tool steel.
7. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The spring (5) is made of spring steel.
8. The axial direct-acting tap wrench handle mechanism according to claim 1, characterized in that: The larger end of the teardrop-shaped through hole (1-1) faces one end of the handle on the wrench holder (1).