Torsion-adjustable manual tap wrench

Abstract

The utility model discloses a torsion adjustable manual tap wrench, which comprises a clamping assembly and a rotating assembly, the clamping assembly comprises a cylindrical inner core and an outer sleeve, the upper part of the inner core is a locking part, the middle part of the inner core is provided with a jacking boss, the inner part of the inner core is provided with a tap clamping hole, the upper part of the locking part is provided with a locking groove, and the rotating assembly is arranged in the locking groove. A rotating platform is formed on the upper portion of the inner side of the outer sleeve, a tooth-shaped meshing friction matching structure is formed between the jacking boss and the rotating platform, the inner core is further sleeved with a compression spring, a torsion adjusting screw is installed between the outer sleeve and the inner core, and a clamping block is arranged on the top of the outer sleeve. The rotating assembly is provided with a sleeve, a rotating head is fixed to the top of the sleeve, a ball screw extending into the locking groove is installed on the upper portion of the sleeve, and a key block clamping groove matched with the clamping block on the top of the outer sleeve is correspondingly formed in the bottom of the sleeve. After the screw tap is applied, the torsion during tapping can be adjusted according to the material and hardness of the screw tap, so that the screw tap is prevented from being broken during tapping.

Description

Technical Field

[0001] This utility model relates to a manual tap wrench, specifically a torque-adjustable manual tap wrench. Background Technology

[0002] A tap is a tool for machining internal threads and is the most common machining tool used by manufacturing operators when tapping.

[0003] The working principle of a manual tap wrench in the prior art is as follows: rotate the locking screw to push the sliding clamp on the inner side of the frame to slide towards the fixed clamp; place the square position of the tap tail into the square area formed between the fixed clamp and the sliding clamp, tighten the locking screw, and fix the tap.

[0004] The disadvantages of existing manual tap wrenches include: slow rotation of the locking screw when clamping the tap; the need to turn the locking screw during tap use, which can easily cause the tap to loosen; large gaps between the sliding block and the slide rail, making it difficult to lock the tap in place; and the tendency for the front edge of the sliding block to wear down to a rounded corner, rendering it unusable. Furthermore, the tapping torque cannot be limited according to the material and hardness of the tap, making it very easy to break the tap. A broken tap inside the hole is extremely difficult to remove, and may even render the part unusable. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a torque-adjustable manual tap wrench. After applying this utility model, the torque during tapping can be adjusted according to the material and hardness of the tap to prevent the tap from breaking during tapping.

[0006] To solve the above-mentioned technical problems, the present invention provides a torque-adjustable manual tap wrench, comprising a clamping assembly for clamping the tap and a rotating assembly for rotating the clamping assembly, wherein the rotating assembly has a lever. The clamping assembly comprises a cylindrical inner core for clamping the tap and an outer sleeve fitted onto the inner core. The upper part of the inner core is a locking part, and the middle part forms an annular tightening boss. A square tap clamping hole with a reduced diameter is formed inside the inner core. The upper part of the locking part forms a locking groove with a circumferential arc-shaped cross-section. An annular rotating platform is formed on the upper inner side of the outer sleeve. The annular tightening boss and the annular rotating platform are positioned... A toothed meshing friction fit structure is formed. A compression spring is fitted on the inner core located below the annular top tightening boss. Torque adjusting screws for tightening the compression spring are installed in the annular space between the lower inner wall of the outer sleeve and the lower outer wall of the inner core. Upwardly protruding locking blocks are formed on opposite sides of the top of the outer sleeve. The rotating assembly has a sleeve fitted on the upper locking part of the cylindrical inner core. A rotating head is fixed on the top of the sleeve. The lever is horizontally mounted on the rotating head. Ball screws that can extend into the locking groove are screwed along the upper circumferential of the sleeve. A key block groove that matches the locking block on the top of the outer sleeve is opened at the bottom of the sleeve.

[0007] As an improvement of this utility model, a return spring and a cylindrical tap clamping push cap are arranged sequentially from top to bottom inside the cylindrical inner core located below the square tap clamping hole. The bottom end of the cylindrical inner core forms a cylindrical opening with a reduced diameter. A frustum-shaped annular surface is formed between the inner wall of the cylindrical inner core below the square tap clamping hole and the inner wall of the cylindrical opening. A sliding groove is spaced apart along the outer circumference of the cylindrical tap clamping push cap, and a matching locking ball is installed in the sliding groove. When the tap passes through the cylindrical tap clamping push cap and the return spring in sequence, and the square clamping head of the tap extends into the tap clamping hole, the locking ball can be pressed against the cone of the tap by the compression of the frustum-shaped annular surface under the elastic force of the return spring. A screw hole is opened on the cylindrical inner core below the annular clamping boss, through which the locking ball can pass, and a screw plug is installed in the screw hole.

[0008] As a further improvement of this utility model, the rotating head is provided with a horizontal lever mounting hole, and the top of the rotating head is provided with a screw hole that communicates with the lever mounting hole, and a set screw is installed in the screw hole.

[0009] This utility model has the following beneficial technical effects: First, by adjusting the torque adjusting screw, the magnitude of the static friction force between the annular top tightening boss and the annular rotating platform can be further adjusted. When the applied torque exceeds the maximum static friction force generated by the toothed meshing friction fit structure, relative sliding will occur between the inner core and the outer sleeve, thereby protecting the tap from breakage during tapping; Second, in this utility model, the tap can be fixed and locked by the tap clamping push cap during tapping, and the tap clamping push cap can be pushed upwards, making the installation and removal of the tap very convenient; Third, the lever can be fixed by the set screw, making the lever easy to replace. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the main structure of a manual tap wrench in the prior art.

[0012] Figure 2 yes Figure 1 A top-view structural diagram.

[0013] Figure 3 It is after the tap is installed Figure 1 .

[0014] Figure 4 This is a schematic diagram of the assembly structure of the torque-adjustable manual tap wrench of this utility model.

[0015] Figure 5 This is a schematic diagram of the assembly structure of the clamping component in this utility model.

[0016] Figure 6 yes Figure 5 A top-view structural diagram.

[0017] Figure 7 yes Figure 5 A schematic diagram of the structure viewed from below.

[0018] Figure 8 It is along Figure 5 Schematic diagram of the cross-sectional structure along line AA.

[0019] Figure 9 This is a schematic diagram of the rotating assembly in this utility model; the lever on the rotating head is not shown.

[0020] Figure 10 yes Figure 9 The schematic diagram of the right-side partial section structure shows the lever on the rotating head, which is not shown.

[0021] Figure 11 yes Figure 5 Enlarged schematic diagram of the structure at point I.

[0022] Figure 12 This is a schematic diagram of the assembly structure of the torque-adjustable manual tap wrench of this utility model, and the installation state of the tap is also shown in the figure.

[0023] Figure 13 yes Figure 12 The tap in the middle has a square clamping head. Detailed Implementation

[0024] See Figure 4 - Figure 11This utility model discloses a torque-adjustable manual tap wrench, comprising a clamping assembly 100 for clamping the tap 9 and a rotating assembly 200 for rotating the clamping assembly. The rotating assembly includes a lever 201. The clamping assembly 100 comprises a cylindrical inner core 110 for clamping the tap and an outer sleeve 120 fitted onto the inner core. The upper part of the inner core is a locking part 111, and the middle part has an annular tightening boss 112. The interior of the inner core has a square tap clamping hole 113 with a reduced diameter. The upper part of the locking part has a locking groove 114 with a circumferential arc-shaped cross-section. The upper inner side of the outer sleeve has an annular rotating platform 121, and a toothed connection is formed between the annular tightening boss 112 and the annular rotating platform 121. The meshing friction fit structure has a compression spring 130 mounted on the inner core below the annular top tightening boss. Torque adjusting screws 131 for tightening the compression spring are installed in the annular space between the lower inner wall of the outer sleeve and the lower outer wall of the inner core. Upwardly extending locking blocks 122 are formed on opposite sides of the top of the outer sleeve. The rotating assembly 200 has a sleeve 210 fitted onto the upper locking part 111 of the cylindrical inner core. A rotating head 220 is fixed to the top of the sleeve. The lever 201 is horizontally mounted on the rotating head. Ball screws 211 that can extend into the locking groove 114 are screwed along the upper circumferential direction of the sleeve. A key block groove 212 that matches the locking block 122 on the top of the outer sleeve is opened at the bottom of the sleeve. Rotating the lever 201 causes the sleeve 210 to rotate synchronously with the outer sleeve 120, which in turn drives the inner core 110 to rotate synchronously. By adjusting the torque adjusting screw 131, the pressure applied by the compression spring 130 to the annular tightening boss 112 can be adjusted accordingly, and the static friction between the upper part of the annular tightening boss 112 and the annular rotating platform 121 can be further adjusted. When the applied torque exceeds the maximum static friction generated by the toothed meshing friction fit structure between the annular tightening boss and the annular rotating platform, relative sliding will occur between the inner core and the outer sleeve, thereby protecting the tap clamped in the inner core from exceeding the limit torque, and thus preventing the tap clamped in the inner core from breaking.Within the cylindrical inner core 110 located below the square tap clamping hole 113, a return spring 115 and a cylindrical tap clamping push cap 116 are arranged sequentially from top to bottom. The bottom end of the cylindrical inner core forms a tapered opening 117. A frustum-shaped annular surface 118 is formed between the inner wall of the cylindrical inner core below the square tap clamping hole and the inner wall of the opening. Sliding grooves 1161 are spaced apart along the circumference of the outer wall of the cylindrical tap clamping push cap, and matching locking balls 1162 are installed within these grooves. When the tap 9 passes sequentially through the cylindrical tap clamping push cap 116 and the return spring 115, and the square clamping head 91 of the tap extends into the tap clamping hole 113, the locking ball 1162, under the elastic force of the return spring, is pressed against the cone body 92 of the tap by the annular surface 118 of the frustum. A screw hole is provided on the cylindrical wall of the cylindrical inner core 110 located below the annular clamping boss 112, allowing the locking ball 1162 to pass through. A plug 119 is installed in the screw hole. A horizontal lever mounting hole 221 is provided on the rotating head 220, and a screw hole 222 communicating with the lever mounting hole is provided on the top of the rotating head. A set screw 223 is installed in the screw hole.

[0025] See last. Figure 12 , 13 , Figure 12 This is a schematic diagram of the assembly structure of the torque-adjustable manual tap wrench of this utility model. The diagram also shows the installation state of the tap 9. Figure 13 yes Figure 12 The tap 9 in the middle has a square clamping head 91 and a cone 92.

[0026] It is understood that the above specific description of the present utility model is only used to illustrate the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model. Any modifications or equivalent substitutions to the present utility model to achieve the same technical effect are within the protection scope of the present utility model.

Claims

1. A torque-adjustable manual tap wrench, comprising a clamping assembly (100) for clamping the tap and a rotating assembly (200) for rotating the clamping assembly, the rotating assembly having a lever (201), characterized in that: The clamping assembly (100) includes a cylindrical inner core (110) for clamping the tap and an outer sleeve (120) fitted on the inner core. The upper part of the inner core is a locking part (111), and the middle part has an annular tightening boss (112). The inner core has a square tap clamping hole (113) with a reduced diameter. The upper part of the locking part has a locking groove (114) with a circumferential arc cross-section. The upper inner side of the outer sleeve has an annular rotating platform (121). The annular tightening boss (112) and the annular rotating platform (121) form a toothed friction fit structure. A compression spring (130) is fitted on the inner core below the annular tightening boss. The annular space between the lower inner wall of the inner core and the lower outer wall of the inner core is provided with torque adjusting screws (131) for tightening the compression spring. The upper sides of the top of the outer sleeve are formed with upwardly extending locking blocks (122). The rotating assembly (200) has a sleeve (210) sleeved on the upper locking part (111) of the cylindrical inner core. The top of the sleeve is fixed with a rotating head (220). The rotating head is horizontally mounted with the lever (201). The upper circumferential of the sleeve is screwed with ball screws (211) that can extend into the locking groove (114). The bottom of the sleeve (210) is provided with a key block groove (212) that matches the locking block (122) on the top of the outer sleeve.

2. The torque-adjustable manual tap wrench as described in claim 1, characterized in that: Inside the cylindrical inner core (110) located below the square tap clamping hole (113), a return spring (115) and a cylindrical tap clamping push cap (116) are arranged sequentially from top to bottom. The bottom end of the cylindrical inner core forms a cylindrical opening (117) with a reduced diameter. A frustum annular surface (118) is formed between the inner wall of the cylindrical inner core below the square tap clamping hole and the inner wall of the cylindrical opening. A sliding groove (1161) is provided at intervals along the outer circumference of the cylindrical tap clamping push cap, and a matching locking top ball (1162) is installed in the sliding groove. When the tap passes through the cylindrical tap clamping push cap (116) and the return spring (115) in sequence, and the square clamping head of the tap extends into the tap clamping hole (113), the locking ball (1162) is squeezed by the annular surface (118) of the frustum under the elastic force of the return spring and can press against the cone of the tap; the cylindrical inner core (110) located below the annular clamping boss (112) has a screw hole on its cylindrical wall that allows the locking ball (1162) to pass through, and the screw hole is filled with a screw plug (119).

3. The torque-adjustable manual tap wrench as described in claim 1, characterized in that: The rotating head (220) has a horizontal lever mounting hole (221) and a screw hole (222) that communicates with the lever mounting hole at the top of the rotating head. A set screw (223) is installed in the screw hole.

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