JPH1110277A - Chain link with stud - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain link with stud which can effectively prevent the fall-out of the stud. SOLUTION: The stud 4 is arranged between one pair of axis parts 3 faced each other of elliptic shaped link body 1. Recessed parts 6 are formed on both end surfaces 5 of the stud 4 and one pair of axis parts 3 are pressed inward to press-fixed to the stud 4, and a part of axis part 3 is bitten into the recessed part 6 by press-fixing and the reliability of connection is improved with the press-fixing of the stud 4 to prevent the fall-out of the stud 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain link with studs for forming a chain having high tensile strength.

[0002]

2. Description of the Related Art In a chain link with studs, a stud is provided between a pair of opposed shaft portions of an oblong link body, so that the studs prevent the pair of shaft portions from being deformed inward. Can be. For this reason, it has extremely high tensile strength, and is often used as a chain link for a marine anchor chain.

In a chain with a stud as described above, a stud is placed between a pair of opposed shaft portions of the link body in a state where the link body is heated, and both ends of the stud are pressed by inward pressing of the pair of shaft portions. The part is made to bite into a pair of shaft parts.

[0004]

By the way, in a chain link with a stud which has been conventionally known, both ends of the stud opposed to the shaft portion are smooth arcuate concave surfaces, so that the stud with respect to the shaft portion is formed. When the stud is repeatedly impacted during the winding or unwinding of the chain, the stud is loosened at the crimped portion between the shaft and the stud, and the stud may move and fall off.

As a countermeasure against the loosening of the stud, a method of forming a ridge on both end surfaces of the stud and making the ridge bite into the shaft portion of the link body when the stud is crimped can be considered to increase the crimp strength.

However, in this case, if the protrusion does not bite into the shaft portion of the link body, a large effect cannot be obtained in preventing the stud from loosening. If the bite is increased, a large depression is formed in the shaft portion of the link body. As a result, the strength of the chain link with the stud is reduced.

Further, after the stud is crimped, the periphery of the crimped portion is welded to the shaft portion, whereby the loosening of the stud can be reliably prevented. However, since the welding is performed after the stud is crimped, the manufacturing cost is high. There is a problem of sticking.

An object of the present invention is to provide a chain link with a stud which can effectively prevent the stud from falling off.

[0009]

In order to solve the above-mentioned problems, according to the present invention, there is provided an elliptical link body and a stud disposed between substantially central portions of a pair of opposed shaft portions of the link body. In the chain link with studs, in which the pair of shaft portions are pressed inwardly and studs are crimped to the shaft portions, concave portions are formed on both sides of the stud except for the center portions of both end surfaces with respect to the shaft portions. Are provided uniformly.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

As shown, the link body 1 has an elliptical shape formed by bending a round shaft, and butted portions at both ends are welded. a shows a welding part. Studs 4 are provided between a pair of shaft portions 3 connecting the arc-shaped shaft portions 2 at both ends of the oval link main body 1 between central portions in the length direction.

Both end surfaces 5 of the stud 4 are formed in an arc shape along the outer periphery of the shaft portion 3, and a concave portion 6 is provided uniformly on the whole of both end portions of the both end surfaces 5 except for the central portion.

Here, the recess 6 is formed of an arc-shaped recess,
Its opening edge is rounded.

The stud 4 is pressed against the shaft 3 by pressing the opposing shaft 3 inward by a stud press while the link body 1 is heated. The crimping causes both ends of the stud 4 to bite into the shaft portion 3 and a part of the shaft portion 3 to bite into the concave portion 6, whereby the stud 4 is firmly connected to the shaft portion 3.

Here, when protrusions are formed on both end surfaces of the stud 4 instead of the recesses 6, both ends of the stud 4 bite into the shaft portion 3 when the stud 4 is pressed, and the protrusions Further, since the diameter of the shaft portion 3 becomes smaller at the biting position of the protrusion and the biting position of the projection, the strength may be reduced.

In the embodiment, the recesses 6 are provided on both end surfaces of the stud 4, so that when the stud 4 is crimped, the shaft 3 bites into the recess 6, so that the shaft 3 does not become thin, and the shaft 3 does not become thin. 3 can be prevented from decreasing in strength.

Further, since the recess 6 is provided at a position other than the center of both end surfaces of the stud 4, the welded portion a of the link body 1 is not adversely affected and the strength of the welded portion a is reduced. Nor.

If the recess 6 is small, the shaft 3
The depth and depth of the recess 6 are set to about 5 to 6% of the outer diameter of the round shaft forming the link body 1 because the depth of the recess becomes shallow and the reliability of the connection of the stud 4 to the shaft 3 decreases. It is preferable to keep it.

As described above, the recesses 6 are provided at both ends of the both end surfaces 5 of the stud 4, so that when the stud 4 is fixed by crimping, a projection is formed on the shaft 3 opposite to the recess 6. You. Since these concave and convex portions are engaged with each other, even if the stud 4 repeatedly receives an impact, the stud 4
There is little loosening of the studs, and even if a little loosening occurs, the concave and convex portions are held in the engaged state, and the studs 4 are prevented from falling off due to movement.

[0020]

As described above, according to the present invention, a pair of shaft portions facing each other of the link body is pressed inward, and a stud placed between the pair of shaft portions is crimped.
Since the shaft portion cuts into the concave portions provided on both end surfaces of the stud, the stud can be firmly connected to the link body.

For this reason, even if the stud repeatedly acts on the stud, the stud and the crimped portion between the shaft and the stud are hardly loosened, and even if a little slack occurs, the stud is prevented from moving by the engagement of the uneven portion. The studs can be more effectively prevented from falling off.

Further, when the stud is crimped, a projection is formed on the shaft portion side of the link body so as to engage with the concave portion, so that the strength of the link body is not reduced.

[Brief description of the drawings]

FIG. 1 (I) is a front view of a chain link with a stud according to the present invention, and FIG. 1 (II) is an enlarged sectional view showing a connecting portion between a link body and a stud.

FIG. 2 is a perspective view showing the stud according to the first embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Link body 3 Shaft part 4 Stud 5 Both end faces 6 Concave part

Claims (1)

[Claims] An elliptical link main body and a stud disposed between substantially central portions of a pair of opposing shaft portions of the link main body, wherein the pair of shaft portions are pressed inward. A chain link with studs, wherein a stud is crimped to the shaft portion, wherein recesses are uniformly provided on both sides of the stud except for the center of both end surfaces with respect to the shaft portion.