JPS5848827Y2 - Crank structure for driving common contacts of pushbutton dial switches - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pushbutton dial switch used in pushbutton telephones, etc. that calls the other subscriber using a dual-frequency signal.In particular, when any pushbutton is pressed, This relates to a crank structure used to drive a common switch used to supply power to an oscillator circuit that operates in common, to disconnect a transmitter circuit, and to control a resistor connection to a receiver circuit.

Conventionally, various types of common switch operation methods for this type of pushbutton mechanism have been proposed.

For example, there are methods in which the common switch is operated directly with a push button, and methods in which a new actuator is provided to operate the common switch indirectly.

Direct type requires extra contact springs and contacts,
There are limits to how small and thin switches can be made.

An example of the indirect type is shown in Figure 1.

Figure 1 shows pushbuttons 1 arranged in a matrix, selection switches 2 that are operated directly by the pushbuttons 1, and two switches arranged in parallel and in contact with the claws 1-1 of the pushbuttons 1. A push-button dial switch consisting of a crank 3, a return ISl switch 4 of the crank 3, and a common switch 5 driven by the crank 3. The crank 3 is processed by punching or crushing a metal plate. It has the shape shown in Fig. 2.

In the figure, 3-1a and 3-1b are rotation shaft parts, 3-2a
, 3-2 b, 3-2 C are the claw portions 1- of the push button 1.
1, 3-3 is a hook part for the return 18I, 3-4 is a projection part for driving the common switch 5, 35
indicates the body, and the crank 13 consists of these.

Since the body 3-5 that connects the rotation shafts 3-1a and 3-1b is long and narrow, it needs to be rigid to reduce twisting and deflection due to the load of the return IBIF 4 and the common switch 5, and the material is metal. Limited.

In addition, the button arrangement of the dial switch shown in Figure 1 is 4.
If the layout is 3 rows and 4 columns, and the button arrangement is 4 rows and 4 columns, the crank will extend in the longitudinal direction by the distance between the buttons, resulting in flatness (warpage,
(no twisting) is difficult to maintain.

Further, the rotation shaft parts 3-1a, 3-1b are formed from a plate into a partially round shape, so that the rotation shaft parts 3-1a, 3-1
b, arm portions 3-2a, 3-2b, 3-20, protrusion portion 3-
The height-related dimensions in step 4 require particularly high accuracy when determining the operating order of the selection switch and common switch, so when producing in large quantities, the life of the mold must be shortened to maintain dimensional accuracy. This requires setting or post-processing, making it an expensive part.

In addition, if the rotary shaft parts 3-1a and 3-1b are not formed into round shapes, the rotary characteristics will be affected, and the claw part 1- of the push button 1 will be affected.
Arm portions 3-2a, 3-2b, 3 that contact and engage with 1
-2 Since C has a straight part, the direction of action of the load on the spring 4 and the common switch 5 acts in the direction of tilting the push button 1, so there are drawbacks such as large wear on the guide part of the push button 1. there were.

In addition, since the structure is such that only one end of the crank is provided with a protrusion that drives the common switch, if you want to add one make switch or one break switch in addition to the common switch 5 as a special dial, you can use the common switch. It was necessary to make modifications such as stacking additional switches on the 5, and to manufacture a special crank.

In order to solve these drawbacks, the present invention uses a rectangular frame with reinforcing ribs that can resist twisting, bending, and warping caused by the reaction force of the common switch, maintains dimensional accuracy, and uses plastic material that is easy to mold. By forming the contact retaining surface into a curved surface so that the force acting on the push button is in the direction of operation of the push button, and by providing protrusions on both ends of the crank for easily driving a common switch. The present invention provides a crank mechanism for driving a common contact of a pushbutton dial switch that can be used with additional switches.

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

FIG. 3 shows an embodiment of the present invention, in which pushbuttons 11 are arranged in a matrix (4 rows and 4 columns), selection switches 12 are operated directly by the pushbuttons 11, and claws 11 of the pushbuttons 11 are shown. -1, two cranks 13 arranged in parallel in contact with each other, and a common switch 14 driven by the cranks 13 (consisting of contact springs 14-1, 14-2, and 14-3). The selection switch 12, which is arranged below the pushbutton 11, is composed of printed board contacts 12-1. A convex elastic part 12-2 is formed on an insulating rubber sheet as a spring for restoring the push button 11, and a movable contact 12-3 made of conductive rubber is provided at the center inside the convex elastic part 12-2. They are paired.

Further, the crank 13 has rotating shaft portions 13-1a, 1 for rotating by the operating force of the push button 11 shown in FIG.
End sides 13-6 a and 13 with 3-1 b, respectively
-6 b, a connecting portion 13-2 that contacts and engages with the claw portion 11-1 of the push button 11, a protrusion 1 that drives the common switch 14;
3-3a, 13-3b (13-3b is for an additional switch), a connecting portion 13-4 connecting the projections 13-3a and 13-3b, and a connecting portion 132. It consists of a reinforcing rib 13-5, and the supporting end 13-5a of the reinforcing rib 13-5 is connected to the rotation shaft portion 13-1a, 13-1.
It is located on the same line X as b, rotates in the same way, and is molded using a plastic material.

At this time, since the crank 13 has a rectangular frame shape with reinforcing ribs, the effective distance between the rotating shaft portions 13-1 a and 13-1 b is 13-1 a to 13-51.13-1
b ~ 135b, which makes it difficult to twist or bend due to the load when operating by pressing the common switch 14.

In addition, the shape is simpler than conventional ones using metal materials, so it is easier to handle during mass production, and since it is molded from plastic, it is lighter in weight. Since this is possible only with the elasticity of the spring 12-2, there is no need to provide a spring for crank recovery, and there is an advantage that the number of parts is reduced compared to the conventional case.

Further, the surface of the connecting portion 13-2 that comes into contact with the claw portion 11-1 of the push button 11 is formed into a curved shape so that the direction of action of the load of the common switch 14 always acts in the operating direction of the push button 11. Therefore, the push button 11 does not fall down and the wear between the push button and the cover can be reduced.

Also, because of this structure, it can be used as a special dial.
If you want to add more common switches, you should already use crank 1
Since the crank 13 is provided with a protrusion 13-3b, it is only necessary to arrange a contact spring at a position opposite to the common switch 14 by the same means.Since the crank 13 is molded from synthetic resin, the common switch 14 There is no need to consider insulation from other equipment, and it can be easily expanded.

Here, only one reinforcing rib 13-5 is arranged approximately at the center of the connecting portion 13-2, 13=4, but a plurality of reinforcing ribs 13-5 may be provided.

The present invention is based on a Utility Application filed in 1973 by the applicant of the present application.
This is a partial improvement of No. 136223.

As explained above, with this invention, the shape of the crank is formed into a rectangular frame shape with reinforcing ribs, making it possible to use plastic, which improves mass production and reduces weight, eliminating the need for separate parts for crank restoration. Significant improvements were made by
Another advantage is that special dial switches can be easily added.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional pushbutton dial switch, Fig. 2 is a perspective view showing an example of the structure of the crank used in the example of Fig. 1, and Fig. 3 is an embodiment of the pushbutton dial switch of the present invention. FIG. 4 is a sectional view taken along section A-A in FIG. 3, and FIG. 5 is a perspective view showing an example of the structure of the crank used in the embodiment of FIG. 3. 1...Push button, 1-1...Claw part, 2
...Selection switch, 3...Crank,
3-1 a, 3-1 b... Rotating shaft portion, 3-
2a, 3-2b, 3-2C... arm, 3-3.
...Hook part, 3-4...Protrusion part, 3-5
・・・・・・Torso, 4...Fuku1den, 5.
...Common switch, 11...Push button,
111...Claw portion, 12...Selection switch, 12-1...Printed board contact, 12-2...
...Convex elastic part, 12-3...Movable contact, 13...Crank, 13-1 a, 13-
1 b... Rotating shaft portion, 13-2... Connection portion, 13-3 a, 13-3 b... Protrusion portion, 13-4... ...Connection part, 13-5...
・Reinforcement rib, 13-5a... Supporting end of reinforcing rib, 13-6 a, 13-6 b... End side, 1
4...Common switch, 14-1.14-2.1
4-3...Contact spring.

Claims (2)

[Scope of utility model registration request] (1) A plurality of pushbutton dial switches arranged in a matrix, a plurality of selection switches each directly driven by the plurality of pushbuttons, and a plurality of selection switches that contact and engage the claws of the plurality of pushbuttons in parallel. Multiple cranks arranged,
In the pushbutton dial switch, the crank is formed into a rectangular frame shape with reinforcing ribs, and has an edge perpendicular to the axis of rotation caused by the operation of the pushbutton. is provided with a protruding shaft portion, and the reinforcing rib is provided with a support end that receives the operating force of the push button, and one of the sides parallel to the axis of rotation is in contact with the claw portion of the push button. A pushbutton dial switch characterized in that the engagement surface of the pushbutton dial switch is formed into a curved shape, and the other side parallel to the axis of rotation is provided with a protrusion for driving a common switch. Crank structure for common contact drive. (2) A crank structure for driving a common contact of a pushbutton dial switch according to claim 1, wherein the crank is formed by plastic molding.