JP2912708B2 - Plastic chain and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plastic chain that is easy and inexpensive to manufacture and a method for manufacturing the same.

[Conventional technology]

In the conventional plastic chain, a number of elements in which bearing legs having a shaft hole extend from both ends of a shaft portion having a shaft insertion hole are manufactured, and each shaft portion is placed between both bearing legs of another element. The metal shaft was inserted through the shaft hole of both bearing legs and the shaft insertion hole of the shaft portion, and both ends of the metal shaft were caulked so as not to come off.

[Problems to be solved by the invention]

In order to extend the connecting chain, the plastic chain needs to be provided with the above-described shaft stopper for each element. Therefore, there is a problem in that the production is troublesome, the productivity is low, and the cost is not reduced.

In view of such circumstances, an object of the present invention is to provide an inexpensive plastic chain that is easy to manufacture and a method of manufacturing the same.

[Means for solving the problem]

In order to solve the above-mentioned problems, a plastic chain according to the present invention includes a first element in which a bearing leg having a shaft hole extends from both ends of a shaft having a shaft insertion hole, and a shaft having a boss on both end surfaces. A bearing element having a shaft hole extending from both ends of the second element. The second element is connected to the first element by inserting its boss into the shaft hole of the first element. The boss portions are inserted into the shaft holes of the other second elements so as to be connected to each other to extend the connection chain.

In order to solve the above problems, a method of manufacturing a plastic chain according to the present invention includes a first step of molding a first element in which a bearing leg having a shaft hole extends from both ends of a shaft portion having a shaft insertion hole, Forming a second element in which a bearing leg having a shaft hole extends from both ends of a shaft portion having bosses on both end surfaces, wherein the second step comprises the step of forming the shaft of the first element obtained earlier. A first mode in which the boss is formed using the hole as a mold, and a second mode in which the boss is formed using the shaft hole of the second element obtained earlier as a mold, and the second mode is continuously performed. In this way, the connecting chain is extended.

[Action]

In addition to the same element as the conventional one, that is, in addition to the first element in which a bearing leg having a shaft hole extends from both ends of a shaft portion having a shaft insertion hole, a shaft hole is formed from both ends of a shaft portion having bosses on both end surfaces. The bearing leg has a second element extending therefrom, and the boss of the second element is connected to the first element by being inserted into the shaft hole of the first element. When the second elements are connected to each other by being inserted into the shaft holes of the other second elements, it is not necessary to extend the connecting chains by the shaft fixing (caulking step) of each element as in the related art. In this case, if the boss is formed using the shaft hole of the first element or another second element as a mold, the second element can be connected at the same time as the second element is formed.

〔Example〕

The drawings show an embodiment of a plastic chain according to the present invention, and first and second elements used for the plastic chain. As shown in FIG. 1, the first element 1 has a shaft insertion hole.
Bearing legs 14 having shaft holes 13 from both ends of a shaft portion 12 having 11;
14 is a bifurcated extension. As shown in FIG. 2, the second element 2 has a bearing leg having a shaft hole 23 from both ends of a shaft portion 22 having boss portions 21 and 21 on both end surfaces. 24, 24 extend in a bifurcated manner. As shown in FIG. 3, the second element 2 has two bosses 21 and 21 formed with the two axial holes 13 and
13 to be connected to the first element 1, and both boss portions 21, 21 to be connected to each other by being inserted into both shaft holes 23, 23 of the other second element 2, and the required number of links Only extend the connecting chain.

For a linear plastic chain, this is all you need,
In the case of a ring-shaped plastic chain, the shaft 12 of the first element 1 at one end of the connecting chain is inserted between the two bearing legs 24, 24 of the second element 1 at the other end of the connecting chain. Each shaft hole 23
The shaft portion 12 and the bearing legs 24 are fixed to each other by, for example, crimping a metal shaft (not shown) through the shaft insertion hole 11 of the shaft portion 12 so as to connect both ends of the connection chain. What should I do?

In the case of manufacturing such a plastic chain, the first element 1 is molded using an A mold using two types of metals A and B (not shown) (first step), and the B mold is used to mold the first element 1. The second element 2 is formed (second step). In this case, the second step has two modes. The first mode is that the plastic molding material is poured into each of the two shaft holes 13 and 13 of the first element 1 obtained as a mold. , Both bosses
The second mode is a mode in which the plastic molding material is poured into each of the two shaft holes 23, 23 of the second element 2 obtained as a mold, and the two boss sections 21, 21 are formed. This is an embodiment of molding No. 21. In the second step, the connecting chain is extended by continuously performing the second aspect. After molding, the boss portion 21 shrinks a little, so the shaft hole
A small gap is created between 13 and 23 and the shaft hole 13 or 23
It becomes rotatable with respect to.

In the method for manufacturing a plastic chain according to the present invention, since the connecting chains having the required number of links are formed in this manner, the productivity is greatly improved.

In the present invention, one linear plastic chain or one ring-shaped plastic chain contains:
The number of the first elements 1 is not limited to one, and a plurality of the first elements may be used as long as the number of steps is small.

〔The invention's effect〕

According to the present invention, in addition to the same element as that of the related art, that is, the first element in which the bearing leg having the shaft hole extends from both ends of the shaft having the shaft insertion hole, the shaft having the bosses on both end surfaces The bearing element having a shaft hole extends from both ends of the second element.
By inserting the boss of each second element into the axial hole of the other second element and connecting the second element to each other,
As in the prior art, the step of extending the connecting chain by the shaft fixing (caulking step) of each element can be omitted. In this case, since the boss portion is formed using the shaft hole of the first element or another second element as a mold, the second element can be connected simultaneously with the formation of the second element. Therefore, according to the present invention, the production of the plastic chain is facilitated, the productivity is improved, and the plastic chain can be provided at low cost.

[Brief description of the drawings]

FIG. 1 shows a first element used in one embodiment of the present invention,
1A is a side view, FIG. 2B is a horizontal sectional view, FIG. 2 shows a second element used in one embodiment of the present invention, FIG. 1A is a side view, and FIG. FIGS. 3 and 3 show a part of an embodiment of the present invention using the first and second elements, wherein FIG. 3A is a side view and FIG. 3B is a horizontal sectional view. 1 ... first element, 11 ... shaft insertion hole, 12 ... shaft part, 13 ...
Shaft hole, 14 ... bearing leg, 2 ... first element, 21 ... boss part,
22: Shaft, 23: Shaft hole, 24: Bearing leg

Claims (2)

(57) [Claims] 1. A first element having a bearing hole having a shaft hole extending from both ends of a shaft portion having a shaft insertion hole, and a bearing leg having a shaft hole extending from both ends of a shaft portion having bosses on both end surfaces. The second to issue
And the second element is connected to the first element by inserting its boss into the axial hole of the first element, and allows each boss to enter the axial hole of the other second element. Plastic chains that are connected to each other to extend the connecting chain. 2. A first step of forming a first element in which a bearing leg having a shaft hole extends from both ends of a shaft portion having a shaft insertion hole;
Forming a second element in which bearing legs having shaft holes extend from both ends of a shaft portion having boss portions on both end surfaces,
The second step is a first mode in which the boss is formed using the shaft hole of the first element obtained earlier as a mold, and a second mode in which the boss is formed using the shaft hole of the second element obtained earlier as a mold. And a process for continuously extending the connecting chain by performing the second embodiment continuously.