Puller

Abstract

To provide a puller capable of allowing direct assembly or removal of a claw member and having an effect convenient for assembly and use.SOLUTION: A main body having a plurality of snap-fit connecting portions and a threaded hole, each snap-fit connecting portion being provided with a snap-fit groove on a side thereof and including an elastic abutting portion, the elastic abutting portion including a snap-fit structure, a screw screwed into the threaded hole, and a plurality of claw members, each claw member being detachably matched and connected with each snap-fit connecting portion, each claw member having a pivoting portion and a positioning portion, the pivoting portion being pivoted in the snap-fit groove, an end surface of the positioning portion being provided with a concave-convex structure, the concave-convex structure being distributed around the pivoting portion, and the concave-convex structure being releasably snap-fitted with the snap-fit structure for positioning; Wherein when a central vertical line of the positioning portion is parallel to the screw rod, the central vertical line divides the concave-convex structure into a first section and a second section, and with respect to a center of the pivot portion, arc angles of the first section and the second section extending around the pivot portion are different.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an extraction device, and more particularly to an extraction tool. [Background technology]

[0002] The structure of a typical conventional puller, as disclosed in Patent TW 430027, includes at least a connecting seat and a plurality of pawl members, a toothed shaft is threadedly mounted on the connecting seat, and an abutment member is provided at the end of the toothed shaft. When in use, the toothed shaft is rotated to move the pawl members, thereby achieving the purpose of removing the article.

[0003] However, because the claw members of the above configuration cannot be directly removed or assembled, the puller must be discarded after the claw members wear out, making it difficult to replace them. Furthermore, the claw members of the above configuration cannot stably clamp the article, making it easy for the article to loosen and fall off. Furthermore, further reducing the material usage of the article in order to reduce manufacturing costs is also a goal of the present invention.

[0004] Therefore, there is a need to provide a new and innovative extractor to solve the above problems. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Taiwan Patent No. 430027 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION The main object of the present invention is to provide an extractor that can allow direct assembly or disassembly of the claw members and has the effect of being convenient to assemble and use. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides an extractor having a plurality of locking connecting portions and a screw hole, each of the locking connecting portions having a locking groove formed on its side and including an elastic abutment portion, the elastic abutment portion including a locking structure, a screw threaded into the screw hole, and a plurality of claw members respectively removably connected to each of the locking connecting portions, each of the claw members having a pivot portion and a positioning portion, the pivot portion pivotally attached to the locking groove, and one end surface of the positioning portion having a concave-convex structure extending and distributed around the pivot portion, the concave-convex structure being releasably locked to and positioned by the locking structure, wherein when a central vertical line of the positioning portion is parallel to the screw, the central vertical line divides the concave-convex structure into a first section and a second section, and the first section and the second section extend around the pivot portion at different arc angles relative to the center of the pivot portion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of an embodiment of the present invention; [Figure 2] FIG. 1 is an exploded view of an embodiment of the present invention. [Figure 3] FIG. 2 is a side view of a pawl member according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of an embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view of another aspect of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following examples are provided to illustrate possible embodiments of the present invention, but are not intended to limit the scope of the invention.

[0010] 1 to 4, which show one embodiment of the present invention, an extractor 1 of the present invention includes a body 10, a screw 20 and a plurality of claw members 30. As shown in FIG.

[0011] The body 10 has a plurality of locking joints 11 and a screw hole 12. Each locking joint 11 has a locking groove 111 formed on its side and an elastic abutment 112, which includes a locking structure 113. The screw 20 is threaded into the screw hole 12. The plurality of claw members 30 are respectively detachably connected to the locking connection portions 11, and each claw member 30 has a pivot portion 31 and a positioning portion 32. The pivot portion 31 is pivotally connected to the locking groove 111, and one end surface of the positioning portion 32 is provided with a concave-convex structure 321 that extends and is distributed around the pivot portion 31. The concave-convex structure 321 is releasably locked and positioned by the locking structure 113. When a central vertical line L of the positioning portion 32 is parallel to the screw 20, the central vertical line L divides the concave-convex structure 321 into a first section 322 and a second section 323, and the first section 322 and the second section 323 extend around the pivot portion 31 at different arc angles relative 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, which is convenient for assembly and use.

[0012] In this embodiment, the main body 10 includes a base 13 and a top cover 14. The top cover 14 is removably attached to the base 13, for example, by screws. However, the main body 10 may also be integrally molded to further reduce the number of components and costs. The base 13 has a hardness of HRC 40±4, the top cover 14 has a hardness of HRC 47±3, the screw 20 has a hardness of HRC 41±4, and each of the pawl members 30 has a hardness of HRC 45±5. The base 13, the top cover 14, the screw 20, and each of the pawl members 30 are made of, for example, steel (alloy steel, medium-carbon steel, high-carbon steel, spring steel, etc.). The top cover 14 is thin and has a relatively high hardness, which allows it to be as thin as possible while still providing sufficient and stable locking for the pawl members 30. The relatively high hardness of each of the pawl members 30 ensures that they are resistant to deformation and damage.

[0013] The locking groove 111 includes a through groove 114 and a pivot groove 115 from the outside to the inside, the pivot portion 31 is inserted into the pivot groove 115 from the through groove 114 and pivoted to the pivot groove 115, the through groove 114 being narrower than the pivot groove 115. The pivot portion 31 has a narrow diameter D1 and a wide diameter D2, the narrow diameter D1 allows the pivot portion 31 to pass through the through groove 114 and enter the pivot groove 115, 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 and restricted in the pivot groove 115. The through groove 114 includes a side surface 116 extending radially toward the pivot groove 115, and a lead angle 117 (FIG. 4) is provided between the side of the through groove 114 that is close to the positioning portion 32 and the side surface 116. The distance that the side surface 116 extends radially toward the pivot groove 115 is defined as a radial width dimension D3, and the radial width dimension D3 is 0.75 times or more the wide diameter D2. Thus, even if a part of the pivot portion 31 is positioned in the through groove 114 during operation, it can be prevented from inadvertently escaping from the locking groove 111, resulting in excellent reliability. In this embodiment, the pivot groove 115 extends in an arc shape around the screw 20 (FIG. 4), and the pivot part 31 extends outward from the positioning part 32, gradually narrowing (approximately tapered). The outlines of the pivot groove 115 and the pivot part 31 are combined, and the through groove 114 is provided with the lead angle 117. Therefore, when the pivot part 31, which has an approximately tapered shape, abuts on the groove wall of the locking groove 111 during extraction, it is guided to a central position and receives a balanced force. Furthermore, the pivot part 31 is closer to the positioning part 32 and abuts on the groove wall of the locking groove 111 at a root position with the greatest structural strength, which effectively prevents the pivot part 31 from being damaged.

[0014] Preferably, an inserter 21 is removably assembled to one end of the screw 20, and an appropriate inserter 21 can be replaced depending on the item to be extracted. The head 211 of the inserter 21 extends axially beyond the threaded portion of the screw 20 and radially beyond the root position of the thread of the threaded portion, thereby preventing damage to the threaded portion of the screw 20 during the extraction operation.

[0015] In this embodiment, the locking structure 113 includes at least one locking tooth 118, and the concave-convex structure 321 includes a plurality of spaced apart convex teeth 324 and a plurality of concave grooves 325. The at least one locking tooth 118 is releasably engaged with one of the concave grooves 325, allowing each of the pawl members 30 to maintain a predetermined position after pivoting and preventing slippage during removal. One end of each of the pawl members 30 facing the positioning portion 32 has a clamping plate 33 protruding laterally. The clamping plate 33 is used to hook onto an article and may be mounted facing inward ( FIG. 1 ) or outward ( FIG. 5 ). The first section 322 and the clamping plate 33 are located on the same side of the central vertical line L, but may also be located on different sides of the central vertical line L.

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

[0017] 1:Removal tool 10: Main body 11: Locking connection 111: Locking groove 112: Elastic contact part 113: Locking structure 114: Through groove 115: Pivot groove 116: Side 117: Lead angle 118: Locking teeth 12:Screw hole 13: Bass 14: Top cover member 20: Screw 21: Insertion tool 211: Head 30: Claw member 31: Pivot joint 32: Positioning unit 321: Uneven structure 322: First Section 323:Second Section 33: Clamp plate D1:Narrow diameter D2: wide diameter D3: diameter and width dimension L: Center vertical line θ1, θ2: arc angles

Claims

1. An extractor, a main body having a plurality of locking connection portions and one screw hole, each of the locking connection portions having a locking groove formed on a side thereof and including an elastic abutment portion, the elastic abutment portion including a locking structure; a screw threaded into the screw hole; a plurality of claw members, each removably combined and connected to each of the locking connection portions, each having a pivot portion and a positioning portion, the pivot portion pivotally attached to the locking groove, a concave-convex structure on one end surface of the positioning portion, the concave-convex structure extending and distributed around the pivot portion, the concave-convex structure being releasably locked to the locking structure and positioned, wherein when a central vertical line of the positioning portion is parallel to the screw, the central vertical line divides the concave-convex structure into a first section and a second section, and the first section and the second section extend around the pivot portion at different arc angles relative to the center of the pivot portion.

2. 2. The extractor according to claim 1, wherein an inserter is removably assembled to one end of the screw, the head of the inserter extending axially beyond the threaded portion of the screw and extending radially beyond the root position of the thread of the threaded portion.

3. 2. The extractor according to claim 1, wherein one end of each of the claw members facing the positioning portion has a clamp plate protruding laterally, and the first section and the clamp plate are located on the same side of the central vertical line.

4. 2. The extractor according to claim 1, wherein the main body includes a base and an upper cover member, the upper cover member is removably assembled to the base, the hardness of the base is HRC 40±4, the hardness of the upper 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. 2. The extractor of claim 1, wherein the first section extends around the pivot point at an arc angle of 60 to 125 degrees and the second section extends around the pivot point at an arc angle of 65 to 135 degrees.

6. 6. The extractor of claim 5, wherein the first section extends around the pivot point through an arc of 70 degrees and the second section extends around the pivot point through an arc of 90 degrees.

7. The extractor according to claim 1, wherein the locking groove includes a through groove and a pivot groove from the outside to the inside, the pivot part is inserted into the pivot groove from the through groove and pivoted to the pivot groove, and the through groove is narrower than the pivot groove.

8. 8. The extractor 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 a side of the through groove adjacent to the positioning portion and the side surface, a distance by which the side surface extends radially toward the pivot groove is defined as a radial width dimension, and the radial width dimension is at least 0.75 times the wide diameter.

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

10. The extractor according to any one of claims 1 to 9, wherein the pivotal portion extends outward from the positioning portion while gradually narrowing.

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