JPH033949Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact spring support structure for a telephone switch, etc., which is compact and has a plurality of circuits.

The conventional contact spring mounting structure for this type of switch is
The contact springs were laminated on the frame via an insulating plate and fixed with screws, but recently, with the advancement of plastic technology, the structure has been simplified. The frame is provided with a contact spring housing groove according to the number of circuits, the housing groove is equipped with a locking part for locking the contact spring, and the contact spring is provided with a spring seat part that is inserted into the housing groove of the frame. The spring seat portion is provided with a tongue-like protrusion, and the contact springs are inserted one by one and locked and fixed so as to lock with the locking portion of the frame. For this purpose, if a switch that requires five transfer contacts is required, for example, 3x5
It required several man-hours for insertion. Furthermore, if the entire switch is made smaller, handling of the contact spring becomes inconvenient and requires more man-hours. Moreover, there is a limit to the strength of the contact spring housing groove of the frame and the spring seat of the contact spring, as well as to the play between the contact spring and the switch's thickness and the stability of the contact force.

In order to solve these drawbacks, the present invention molds the required number of contact springs into synthetic resin blocks as a driving contact spring group, a driven contact spring group, a fixed contact spring group, etc., and the synthetic resin block is made of synthetic resin. A snap-fit-like fitting structure that utilizes elasticity and a press-fit structure in which the chevron-shaped protrusions provided on the sides of the synthetic resin block are press-fitted to spread the inner wall of the frame opening are used to secure the block to the frame. It provides a contact spring support structure.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a switch to which an embodiment of the present invention is applied, and FIG. 2 is an exploded view of the switch. 1 is the frame,
2 is a driven contact spring block, 3 is a driving contact spring block, 4 is a fixed contact spring block, 5 is a lever,
6 is a return spring. The frame 1 is provided with a spring block accommodating opening A1-1 for accommodating the driven contact spring block 2 and the driving contact spring block 3, and a spring block accommodating opening B1-2 for accommodating the fixed contact spring block 4. Spring block 2
consists of a contact spring part 2-1 and a molded block 2-2, and the active contact spring block 3 is composed of a contact spring part 3
-1 and a mold block 3-2, and the fixed contact spring block 4 consists of a contact spring part 4-1 and a mold block 4-2.In order to reduce the size of the switch, each contact spring block is L-shaped. There is. The mold block 2-2 has protruding pins 2-2a and 2-2 that hold the mold block 3-2.
2b and the spring block receiving opening A of the frame 1.
1-1, stoppers 2-2e, 2-2f for regulating the insertion position, and protruding pins 2-2a, 2-2.
-2b and a chevron-shaped protrusion 2-2g on the opposite surface. The mold block 3-2 has retaining holes 3-2a and 3 for retaining the mold block 2-2.
-2b and a chevron-shaped protrusion 3-2c on the surface opposite to the surface that contacts the mold block 2-2. The mold block 4-2 has hooks 4-2a and 4-2b for snap-fitting the spring block accommodating opening B1-2 of the frame 1, and stoppers 4-2c and 4-2d for regulating the insertion position. It is provided with a chevron-shaped protrusion 4-2e that forms the main part of the press-fit structure.

FIG. 3 shows the details of the mold block 2-2, and FIG. 4 shows the details of the mold block 3-2. Retaining hole 3-2a of mold block 3-2,
Either one of 3-2b is mold block 2-
2 protruding pins 2-2a, 2-2b and retaining hole 3-2
In order to absorb the positional and dimensional deviation of holes 3-2a and 3-2b, the hole diameter is d.
The pin diameter D of the protruding pins 2-2a and 2-2b is d<
The dimensions are press fit according to the relationship D.

FIG. 5 shows details of the spring block receiving opening A1-1 of the frame 1, in which a is a perspective view and b is a cross-sectional view taken along the cross-section C--C. 1-1a, 1-
Reference numeral 1b is a hook portion for snap-fitting the mold block 2-2. 1-1c, 1-
1d is a contact surface between the mold block 2-2 and the chevron-shaped projections 2-2g, 3-2c of the mold block 3-2, and a contact surface between the chevron-shaped projections 2-2g, 3-2c and the contact surfaces 1-1c, 1- 1d forms the above-mentioned press-fit structure which constitutes the gist of the present invention. The dimensional distribution has the following relationship. That is, the distance between the hooking parts 2-2c and 2-2d of the mold block 2-2 is +2α, and the distance between the base position m of the undercut α from the stoppers 2-2e and 2-2f and the spring block accommodation opening A1-1 is +2α. The distance L between the hanging parts 1-1a and 1-1b and the end point position M of the L dimension are set as +2α>L, m=M, and the elastic deformation corresponding to the undercut α becomes the pulling force of the mold block 2-2. , the play in the insertion direction is zero. On the other hand, in the press-fit structure,
The block thicknesses n and n' including the chevron-shaped protrusions 2-2g and 3-2c on the orthogonal side and the opening widths N+N' of the contact surfaces 1-1c and 1-1d are set in the relationship n+n'>N+N', and their interference is Since the chevron-shaped protrusions 2-2g and 3-2c are press-fitted so as to gouge out the contact surfaces 1-1c and 1-1d during insertion, there is no play against the acting force of the contact springs 2-1 and 3-1. It is designed not to cause this. On the other hand, the relationship between the spring block 4-2 and the spring block housing opening B1-2 is also similar.

Here, the mold block 3-2 was not directly fixed to the frame 1 as shown in Fig. 6a.
This is because the spring block opening A'1-1' is made as shown in Fig. 1, and the switch is made smaller by x.Of course, it can also be done directly. Because of this structure, there is no play in the contact spring, and the thickness H of the frame 1, which was required to be about 5 mm in the conventional structure, can be reduced to about 2 mm, making the switch thinner. I was able to make it happen.

Incidentally, in this embodiment, the hook portion to which the snap fit is connected is formed in a straight line, but it may be formed in a round shape as shown in FIG. 6b.

As explained above, according to the present invention, the contact springs are made into mold blocks for each function (active, driven, fixed), which makes it possible to significantly reduce the assembly man-hours for multi-circuit switches, resulting in a more compact switch. The practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is an assembled perspective view of an embodiment of the switch of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a perspective view showing details of the driven contact spring mold block.
4 is a perspective view showing details of the active contact spring mold block, FIGS. 5a and 5b are perspective views and sectional views showing details of the spring block housing portion of the frame, and
The figure is a perspective view showing another specific example of the snap-fit coupling structure. 1... Frame, 1-1, 1-1'... Spring block housing openings A, A', 1-1a, 1-1b
...Latching part, 1-1c, 1-1d...Abutment surface, 1
-2...Spring block housing opening B, 2...Followed contact spring block, 2-1...Contact spring part, 2-
2...Mold block, 2-2a, 2-2b...
...Protrusion pin, 2-2c, 2-2d...Latching part, 2
-2e, 2-2f...Stopper, 2-2g...Chevron protrusion, 3...Active contact spring block, 3-1...
...Contact spring part, 3-2...Mold block, 3
-2a, 3-2b...Retaining hole, 3-2c...Chevron protrusion, 4...Fixed contact spring block, 4-1...
Contact spring part, 4-2...Mold block, 4-
2a, 4-2b...Latching part, 4-2c, 4-2d
...Stopper, 4-2e...Chevron protrusion, 5...Lever, 6...Return spring.

Claims (1)

[Scope of utility model registration request] A frame having an opening at a predetermined position, a synthetic resin block having an outer shape to be inserted and fitted into the opening and formed to integrate a plurality of contact springs, and an outer wall of the synthetic resin block. A chevron-shaped protrusion having a height slightly larger than the distance between the outer wall and the inner wall is provided at a position facing the inner wall of the opening, so that when the synthetic resin block is inserted into the opening, the synthetic resin Snapfit fitting is performed in the length direction of the block.
In the width direction of the synthetic resin block, the protrusion is press-fitted while gouging the inner wall of the opening, and the synthetic resin block is pressed against the contact spring by utilizing the stress acting between the protrusion and the inner wall of the opening. A contact spring support structure configured such that the contact spring is stably erected from the frame by being fixed without wobbling against the acting force of the contact spring.