JPS6049405B2 - Simultaneous molding method for a pair of engaging members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a first member such as a switching bar or a ratchet wheel and a second member that engages with the first member are simultaneously formed on a substrate by so-called outside molding. The present invention relates to a method for simultaneously molding a pair of engaging members.

A first member such as a switching lever and a second member such as a spring that engages with the first member to maintain the position of the first member are simultaneously molded on a synthetic resin substrate. In this case, a gap equal to the thickness of the mold is required between the two members.

For this reason, conventionally, a first member such as a switching lever is molded together with a second member at a moldable position, and during assembly, the first member is rotated to a position where the second member engages. was. In other words, it required time and effort to engage both members after molding, and the first member was the sixth member.
If the ratchet wheel shown in the figure has a shape that always engages with the second member even when rotated, it is not possible to mold both members at the same time. The present invention has been made in view of these points, and its purpose is to ensure that the two members engage with each other even if no effort is added after molding, and that the first member is rotated. It is an object of the present invention to provide a method for simultaneously molding a pair of engaging members that can be molded simultaneously even if the engaging members have a shape that always engages with a second member.

The present invention will be explained in detail below based on examples.

In the figure, 1 is a first member made of synthetic resin whose shaft portion lb is rotatable with respect to the board 3 like a frequency switching lever, and 2 is a synthetic resin member that is in elastic contact with the first member 1. There is a second member. Both members 1 and 2 are provided on the substrate 3 at the same time by outside molding, but the engagement point 2a of the second member 2 with respect to the first member 1 and the engagement point 2a of the second member 2 with respect to the first member 1 are
Legs 2c, 2 having dimensions sufficiently long compared to the length of the first member 1 between the fixing points 2b, 2b to the substrate 3 of
c is provided on the second member 2. The longitudinal direction of both leg portions 2c is made to coincide with the direction in which both members 1 and 2 are engaged.
However, during molding, as shown in FIG.
, 2 are molded with a gap 4 corresponding to the thickness of the molding die provided between the engagement points 1a and 2a of the molding die.

By the way, synthetic resins shrink after being molded, and the amount of shrinkage is proportional to the length. Therefore, the engagement point 2a of the second member 2 approaches the engagement point 1a of the first member 1 due to contraction after molding of the second member 2, which has a longer leg portion 2c than the first member 1. Then, as shown in FIG. 2, both members 1 and 2 are engaged. 3 to 5 show examples in which the engagement point 2a of the second member 2 is formed thick so that the tip angle does not change even when the engagement point 2a shrinks after molding.

In addition, FIG. 6 shows that the first engaging member 1 has engagement points 1a on its entire circumference.
This shows a case where the ratchet wheel has a part that becomes , and even in this case, simultaneous molding can be performed. As described above, according to the present invention, not only can a pair of engaging members be formed by simultaneous molding on a substrate, but also the two members can be engaged without play without changing any labor after molding. Moreover, it is not necessary to rotate the member to the engagement position after molding at another position as in the conventional case, and of course there is no need to provide a space for this rotation, which makes effective use of space. It is possible to do this.

This is particularly effective in the case shown in FIG. 6, in which the first member is always engaged with the second member even when the first member is rotated.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment according to the present invention during molding, FIG. 2 is a front view of the same after molding, and FIGS. 3 to 6 are front views of other embodiments after molding. , 1 is the first member, 1a is its engagement point, 2 is the second member, 2a is its engagement point, 2b
is its fixed point, 3 is the substrate, and 4 is the gap.

Claims (1)

[Claims] 1 The first plate is molded to be rotatable relative to the substrate.
A method of simultaneously molding a member made of synthetic resin and a second member made of synthetic resin fixed to a substrate and engaged with the first member, the method comprising: a fixing point of the second member to the substrate; After forming a long portion between the engagement points of the second member and the first member, and providing gaps between the respective engagement points of the first member and the second member, both members are simultaneously molded. A method for simultaneously molding a pair of engaging members, characterized in that both members are brought into engagement by contraction of the second member after molding.