JPS5915368Y2 - push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a push-button switch, and more particularly to a push-button switch having a relatively long key on an operating surface.

In desktop electronic computers and the like, in addition to normal push buttons, push buttons with slightly longer operation surfaces are sometimes used, and this is often more convenient for calculation operations.

With such push buttons with long operation surfaces, the key tends to tilt, especially when the end of the key is pressed.To prevent this, for example, in the case of a rubber contact switch, conventionally a rubber contact switch was placed under the same key. Structures have been used in which two contacts are provided, or a key is attached to a stabilizing rod supported by a metal rod, and the stabilizing rod is rotatably supported by the housing.

However, in the former configuration, a two-degree moderation feeling may occur depending on where it is pressed, and in the latter configuration, the metal stabilizing rod must be prevented from coming into contact with the circuit on the insulating board. However, there were drawbacks such as a complicated mounting structure.

The present invention eliminates the drawback of oblique positioning, smoothes the pressing operation of the key, and allows the key to move within a certain limit.An example of the invention will be described in detail below with reference to the drawings. Explain.

Fig. 1 is a sectional view taken along the longitudinal direction of the push button switch of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, 1 is a frame made of synthetic resin, and 2 is a synthetic resin inserted into the frame 1. A key made of resin, 3 a rubber sheet integrally formed with a dome-shaped movable part 4, 5 a movable contact made of conductive rubber or the like fixed to the lower surface of the movable part 4, 6 a fixed contact 7, 7 and This is an insulating substrate on which a printed wiring circuit (not shown) is formed.

The key 2 has a somewhat long operation surface, and the lower surface has a pressing protrusion 8 in the center and a pair of U-shaped protrusions 9, 9 on both sides.
The tips of the protrusions 9, 9 are formed to protrude below the lower end surface of the key 2, and 10.10 is a notch formed on one side of the lower end.

Next, reference numeral 11 denotes a lever engaged with the U-shaped protrusions 9, 9, which has a structure as shown in FIG. Consists of a shaped body 13.13,
The engagement rods 14, 14 of the U-shaped body 13.13 and the shaft rod 1
2 is formed into a substantially cylindrical shape, and furthermore, the U-shaped body 1
3.13 are interconnected by auxiliary rods 15 to provide strength against deflection.

As shown in FIG. 3, the lever 11 has an engaging rod 14,
14 are the engagement grooves 9a of the U-shaped protrusions 9, 9 of the key.
. and is rotatably supported.

Note that the U-shaped bodies 13 and 13 of the lever 11 are both key 2.
It is located below the notch 10.10 of.

Further, 16.16 is a through hole provided by removing a part of the rubber sheet 3, and the through hole 16.16 is connected to the U-shaped protrusion 9 of the key 2.
, 9 are formed at opposite positions below.

Note that in the left half of FIG. 1, a portion of the rubber sheet 3 has been removed so that the arrangement of the lever 11 can be seen.

Next, the operation when pressing the key 2 will be explained with reference to FIG. 3. When the key 2 is pressed downward, the lever 11
The shaft rod 12 rotates within the bearing portion 1a of the frame 1, and the lever 11
is lowered, and the engaging rods 14, 14 slide and move to the right in FIG. , the movable portion 4 of the rubber sheet 3 is compressed by the pressing protrusion 8, and the movable contact 5 is pressed against the fixed contacts 7, 7.

At this time, even if an extra pressing force is applied to the key 2, the pair of U-shaped protrusions 9, 9 come into contact with the insulating substrate 6, so the key 2
Even when the key 2 is pressed completely, the key 2 is kept in a horizontal state and its moving distance is constant, so that the movable part 4 is not compressed excessively.

Therefore, even when the key 2 is no longer pressed, it returns upward very smoothly.

Furthermore, the lever 11 is prevented from being distorted by the auxiliary rod 15, is easily molded into a desired shape using synthetic resin, and does not short-circuit the printed circuit on the insulating substrate 6, so it is particularly suitable for insulation. There is no need to consider it.

The present invention comprises a frame made of synthetic resin, a key fitted neatly into the frame, and a lever more powerful than the synthetic resin, each of which has a pair of U-shaped protrusions protruding from the lower surface of the key. A pair of engaging rods formed on the lever are slidably engaged, and a shaft rod of the lever is rotatably supported in a notch-shaped bearing provided in the frame. An insulating substrate is provided that abuts to sandwich the shaft rod together with the bearing portion, and each of the U-shaped protrusions comes into contact with the insulating substrate when a key is pressed, thereby providing a push button with a long operation surface. The lever is made of synthetic resin, and the lever shaft can be assembled by matching the frame and insulating board, so it is easy to assemble and has a simple structure. Therefore, it has many practical effects, such as being able to provide an inexpensive push button switch.

[Brief explanation of the drawing]

The drawings are all related to the present invention, and FIG. 1 is a sectional view of the push button switch, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a perspective view showing a pressed state, and FIG. FIG. 2 is a perspective view of the main parts of the key seen from the bottom surface. 1...Frame, 2...Key, 6...
・Insulating substrate, 9, 9... U-shaped projection, 9a, 9
a...Engagement groove, 11...Lever 12.
...Axis rod, 14.14...Engagement rod.

Claims (1)

[Scope of utility model registration request] It comprises a frame made of synthetic resin, a key fitted neatly into the frame, and a lever made of synthetic resin, and the lever is inserted into each of the engagement grooves of a pair of U-shaped protrusions protruding from the lower surface of the key. A pair of engaging rods formed in the above are slidably engaged, and a shaft rod of the lever is rotatably supported by a notch-shaped bearing provided in the frame, and the lever is brought into contact with the frame. A push-button switch characterized in that an insulating substrate is disposed to sandwich the shaft rod together with the bearing portion, and each of the U-shaped projections can come into contact with the insulating substrate when a key is pressed.