Extraction tool

Abstract

The claw members can be directly assembled or disassembled, and a puller is provided that is convenient for assembly and use. [Solution] The extraction tool 1 has a plurality of locking connection parts 11 and one screw hole, each of which has a locking groove 111 on the side and includes an elastic contact part 112, the elastic contact part including a body 10 including a locking structure, a screw screwed into the screw hole, and a plurality of claw members 30, each detachably combined and connected to each of the locking connection parts, each claw member having a pivot part and a positioning part, the pivot part being pivotally attached to the locking groove, one end face of the positioning part having a groove structure, the groove structure extending and distributed around the pivot part, the groove structure being releasably locked and positioned to the locking structure, and when the central vertical line of the positioning part is parallel to the screw, the central vertical line divides the groove structure into a first section and a second section, and the plurality of claw members have different arc angles in which the first section and the second section extend around the pivot part with respect to the center of the pivot part.

Description

Technical Field

[0001] The present invention relates to a pulling device (mechanical pulling tool) such as a gear puller, and particularly to a pulling tool.

Background Art

[0002] Regarding the configuration of a general conventional pulling tool, as disclosed in Patent TW430027, the configuration includes at least a connection seat and a plurality of claw members. A toothed shaft is screwed to the connection seat, and a contact member is provided at the end of the toothed shaft. By rotating the toothed shaft during use, the claw members are moved, thereby achieving the purpose of removing an article (gear, pulley, bearing, etc.).

[0003] However, since the claw members of the above configuration cannot be directly removed or assembled, after the claw members are worn, the pulling tool cannot replace the claw members and thus has to be discarded, making it difficult to use. In addition, the claw members of the above configuration cannot clamp an article stably, and the article is likely to loosen and fall off. In addition, in order to reduce manufacturing costs, how to further reduce the use of materials for articles is similarly the goal of the intensive research of the present invention.

[0004] Therefore, in order to solve the above problems, it is necessary to provide a novel and progressive pulling tool.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The main objective of this invention is to provide a pull-out tool that allows for the direct assembly or disassembly of the claw members and has the advantage of being convenient to assemble and use. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides an extraction tool having a plurality of locking connection parts and one screw hole, each locking connection part having a locking groove on its side and including an elastic contact part, the elastic contact part comprising a body including a locking structure, a screw screwed into the screw hole, and a plurality of claw members, each detachably combined and connected to each locking connection part, each claw member having a pivot part and a positioning part, the pivot part being pivotally mounted to the locking groove, one end face of the positioning part having a grooved structure, the grooved structure extending and distributed around the pivot part, the grooved structure being releasably locked and positioned to the locking structure, the plurality of claw members having a central vertical line parallel to the screw, the central vertical line dividing the grooved structure into a first section and a second section, and the arc angles of the first section and the second section extending around the pivot part being different with respect to the center of the pivot part. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of one embodiment of the present invention. [Figure 2] This is an exploded view of one embodiment of the present invention. [Figure 3] This is a side view of a claw member according to one embodiment of the present invention. [Figure 4] This is a cross-sectional view of one embodiment of the present invention. [Figure 5] This is a perspective view of another embodiment of one of the present invention. [Modes for carrying out the invention]

[0009] Possible embodiments of the present invention will be described below with reference to examples, but this will not limit the scope of the present invention.

[0010] Referring to Figures 1 to 4, this illustrates one embodiment of the present invention. The extraction tool 1 of this invention is an extraction tool such as a gear puller for mechanically extracting and removing articles (gears, pulleys, bearings, etc.), and includes a main body 10, a screw 20, and a plurality of claw members 30.

[0011] The main body 10 has a plurality of locking connection parts 11 and one screw hole 12, and each locking connection part 11 has a locking groove 111 on its side and includes an elastic contact part 112, the elastic contact part 112 includes a locking structure 113. The screw 20 is screwed into the screw hole 12. Each of the multiple claw members 30 is removably combined and connected to each of the locking connection parts 11, and each claw member 30 has a pivot part 31 and a positioning part 32, the pivot part 31 is pivotally attached to the locking groove 111, and a recessed structure 321 is provided on one end face of the positioning part 32. The uneven structure 321 extends and is distributed around the pivot portion 31, and the uneven structure 321 is releasably locked and positioned to the locking structure 113. When the central vertical line L of the positioning portion 32 is parallel to the screw 20, the central vertical line L divides the uneven structure 321 into a first section 322 and a second section 323, and the arc angles in which the first section 322 and the second section 323 extend around the pivot portion 31 are different with respect to the center of the pivot portion 31. This allows the claw member 30 to be directly assembled to the main body 10 or directly removed from the main body 10, providing a convenient effect for assembly and use.

[0012] In this embodiment, the main body 10 includes a base 13 and an upper cover member 14. The top cover member 14 is removably assembled to the base 13, for example, by screws. However, the main body 10 may be integrally molded, further reducing the number of components and thus lowering costs. The hardness of the base 13 is HRC40±4, the hardness of the top cover member 14 is HRC47±3, the hardness of the screw 20 is HRC41±4, and the hardness of each claw member 30 is HRC45±5. Of these, the base 13, the top cover member 14, the screw 20, and each of the claw members 30 are made of, for example, steel (alloy steel, medium carbon steel, high carbon steel, spring steel, etc.). The upper cover member 14 is thin and has relatively high hardness, making it as thin as possible while simultaneously providing a sufficient and stable locking effect to the claw member 30. Each of the claw members 30 has relatively high hardness, ensuring that it is resistant to deformation and damage.

[0013] The locking groove 111 includes a through groove 114 and a pivot groove 115 running from the outside to the inside. The pivot portion 31 is inserted into the pivot groove 115 from the through groove 114 and pivotally attached to the pivot groove 115. The through groove 114 is narrower than the pivot groove 115. The pivot portion 31 has a narrow diameter D1 and a wide diameter D2, the narrow diameter D1 allowing the pivot portion 31 to enter the pivot groove 115 through the through groove 114, and the wide diameter D2 is larger than the groove opening width of the through groove 114 so that the pivot portion 31 is positioned within the pivot groove 115. The through groove 114 includes a side surface 116 that extends radially toward the pivot groove 115, and a lead angle 117 (Figure 4) is provided between the side of the through groove 114 adjacent to the positioning portion 32 and the side surface 116. The distance over which the side surface 116 extends radially toward the pivot groove 115 is defined as the diameter width dimension D3, and this diameter width dimension D3 is 0.75 times or more the wide diameter D2. In this way, even if a part of the pivot portion 31 is positioned in the through groove 114 during the work period, it is possible to prevent it from unintentionally coming out of the locking groove 111, thus providing excellent reliability. In this embodiment, the pivoting groove 115 extends in an arc around the direction of the screw 20 (FIG. 4). The pivoting portion 31 extends outwardly and gradually narrows from the positioning portion 32 (substantially tapered). Since the outer shapes of the pivoting groove 115 and the pivoting portion 31 are combined and the lead angle 117 is provided in the through groove 114, when pulling out, when the pivoting portion 31 having a substantially tapered shape abuts against the groove wall of the locking groove 111, it is guided to the central position and receives force evenly, and the pivoting portion 31 approaches the positioning portion 32 and abuts against the groove wall of the locking groove 111 at the root position having the maximum structural strength, effectively avoiding damage to the pivoting portion 31.

[0014] Preferably, an insert 21 is removably assembled to one end of the screw 20. The insert 21 is a member that directly abuts and presses against the article to be removed, and an appropriate insert 21 can be exchanged according to the article to be removed. The head 211 of the insert 21 extends axially beyond the threaded portion of the screw 20 and radially beyond the valley position of the thread of the threaded portion, avoiding damaging the threaded portion of the screw 20 during the removal operation.

[0015] In this embodiment, the locking structure 113 includes at least one locking tooth 118. The concave-convex structure 321 includes a plurality of convex teeth 324 and a plurality of concave grooves 325 arranged at intervals, and the at least one locking tooth 118 is releasably fitted and locked into one of the plurality of concave grooves 325. In this way, each claw member 30 can hold the determined position after swinging, and can also prevent slipping out during pulling out. One end of each claw member 30 facing the positioning portion 32 has a clamping plate (clamping claw) 33 protruding laterally. The clamping plate 33 is used to be hooked on an article. Among them, the clamping plate 33 may be attached inwardly (FIG. 1) or outwardly (FIG. 5). The first section 322 and the clamp plate 33 are located on the same side of the central vertical line L, but the first section 322 and the clamp plate 33 may be located on different sides of the central vertical line L.

[0016] Preferably, the arc angle θ1 of the first section 322 extending around the pivot portion 31 is 60 to 125 degrees, and the arc angle θ2 of the second section 323 extending around the pivot portion 31 is 65 to 135 degrees. For example, the arc angle θ1 of the first section 322 extending around the pivot portion 31 is 70 degrees, and the arc angle θ2 of the second section 323 extending around the pivot portion 31 is 90 degrees. The large arc angle θ2 of the second section 323 allows the claw member 30 to maintain a similarly determined position when it swings outward at a large angle, and at the same time prevents the claw member 30 from unintentionally disengaging from the locking groove 111. [Explanation of Symbols]

[0017] 1: Extraction tool 10: Main unit 11: Locking connection 111: Section High Groove 112: Elastic contact area 113: Locking structure 114: Through groove 115: Pivot groove 116: Side view 117: Lead angle 118: Locking teeth 12: Screw holes 13: Bass 14: Top cover component 20: Screw 21: Insertion device 211: Head 30: Claw member 31: Pivot joint 32: Positioning section 321: Uneven structure 322: Section 1 323: Section 2 33: Clamp plate D1: Narrow diameter D2: wide diameter D3: Diameter width dimension L: Center vertical line θ1, θ2: Arc angle

Claims

1. It is an extraction tool, It has multiple locking connection parts and one screw hole, each of the locking connection parts has a locking groove on its side and includes an elastic contact part, the elastic contact part includes a body including a locking structure, A screw is threaded into the aforementioned screw hole, An extraction tool comprising a plurality of claw members, each detachably combined and connected to each of the locking connection portions, each claw member having a pivot portion and a positioning portion, the pivot portion being pivotally attached to the locking groove, one end face of the positioning portion having a grooved structure, the grooved structure extending and distributed around the pivot portion, the grooved structure being releasably locked and positioned to the locking portion, and the plurality of claw members, in which the central vertical line of the positioning portion is parallel to the screw, divides the grooved structure into a first section and a second section, and the arc angles of the first section and the second section extending around the pivot portion are different with respect to the center of the pivot portion.

2. The extraction tool according to claim 1, wherein an insert is removably assembled to one end of the screw, and the head of the insert extends axially beyond the threaded portion of the screw and radially beyond the root of the threads of the threaded portion.

3. The extraction tool according to claim 1, wherein one end of each claw member facing the positioning portion has a clamping plate that protrudes laterally, and the first section and the clamping plate are located on the same side of the central vertical line.

4. The extraction tool according to claim 1, wherein the main body includes a base and a top cover member, the top cover member is detachably assembled to the base, the hardness of the base is HRC 40 ± 4, the hardness of the top cover member is HRC 47 ± 3, the hardness of the screw is HRC 41 ± 4, and the hardness of each of the claw members is HRC 45 ± 5.

5. The extraction tool according to claim 1, wherein the arc angle of the first section extending around the pivot portion is 60 to 125 degrees, and the arc angle of the second section extending around the pivot portion is 65 to 135 degrees.

6. The extraction tool according to claim 5, wherein the arc angle of the first section extending around the pivot portion is 70 degrees, and the arc angle of the second section extending around the pivot portion is 90 degrees.

7. The extraction tool according to claim 1, wherein the locking groove includes a through groove and a pivot groove from the outside to the inside, the pivot portion is inserted into the pivot groove from the through groove and pivotally attached to the pivot groove, and the through groove is narrower than the pivot groove.

8. The extraction tool according to claim 7, wherein the pivot portion has a narrow diameter and a wide diameter, the through groove includes a side surface extending radially toward the pivot groove, a lead angle is provided between the side of the through groove adjacent to the positioning portion and the side surface, the distance by which the side surface extends radially toward the pivot groove is defined as the diameter width dimension, and the diameter width dimension is 0.75 times or more the wide diameter.

9. The extraction tool according to claim 7, wherein the pivot groove extends in an arc shape around the direction of the screw.

10. The extraction tool according to any one of claims 1 to 9, wherein the pivot portion extends outward from the positioning portion, gradually shrinking in size.

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