JPH0218498Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a switch having a key top with a relatively large pressing area.

Generally, this type of switch is used, for example, as a space key on an electric typewriter or a push button on a copying machine.

This switch is constructed as shown in FIG. 1 so that the switching action can be performed reliably no matter where pressing force is applied to the key top. That is, a switch body 2 is provided on a substrate 1, a key top 3 covers the switch body 2, a switch pressing piece 4 hanging down from the top plate 3a of the key top 3 is inserted into the key stem 2a of the switch body 2, and the switch body 2 is covered with a key top 3. A switching mechanism (not shown) in 2 is configured to perform a switching operation.

However, since this key top 3 has a large pressing area, the operator does not necessarily press the key top on or near the top of the switch 5, but may press a position quite far away from the switch 5, such as position A on the right end of the figure, for example. be. The interlocking rod 6 is provided so that the switching operation can be performed reliably even in such a case. This interlocking rod 6 has an arm portion 6a that rotates in response to a pressing force applied to the right end of the key top 3, a twisted portion 6b that is twisted by the rotation of this arm portion 6a, and a rotating force that re-twists the twisted portion 6b. The switch 5 is configured such that the pressing force applied to one arm 6a is transmitted to the other arm 6c, and the switch 5 is operated even if any part of the key top 3 is pressed. ing. That is, the interlocking rod 6 is twisted by the pressing force at one end, and this twisting causes the interlocking rod 6 to twist.
The key top 3 of this part is pushed down by the other arm part.

However, when assembling this switch 5, first the twisted portion 6b of the interlocking rod 6 is fitted into the support member 8 on the board 1. Next, the bent ends 6d and 6e of the arm portions 6a and 6c of the interlocking rod 6 are engaged with an L-shaped engaging member 7 protruding from the lower surface of the top plate 3a of the key top 3. However, when assembling this switch 5, what must be taken into consideration is that, as is clear from FIG. The point is that the bent ends 6d and 6e of the connector must be engaged with the engaging member 7.

Although it has a certain degree of freedom, the interlocking rod 6 rotates around the support member 8, and the key top 3 connected by the interlocking rod 6 moves in the vertical direction, so both When they operate together, one is restricted by the other, making it difficult to fit the switch pressing piece 4 together.

Furthermore, when attaching and removing the key top 3, unnecessary force may be applied to the engaging member 7 etc. due to the difficulty of assembly, and in such a case, the engaging member 7 etc. may be damaged. There is a possibility that it will.

The present invention was created in view of the above points, and provides a switch that is easy to install and remove.
The gist is a switch body mounted on a circuit board, a key top having a switch pressing piece fitted into a key stem of the switch body, an interlocking rod whose twisted part is swingably supported by the key top, and the board. A support member is provided on the support member and has a gap into which the arm of the interlocking rod is inserted.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a sectional view showing the main parts of the switch of the present invention, and FIG. 4 is a perspective view of the engaging member.
The same members as those shown in the figures are designated by the same reference numerals.

This switch 10 has a through hole 1 formed in the circuit board 1.
The key top 3 has a support member 13 having legs 12, 12, 12 that are inserted into the key top 1, and an engagement member 14 that is fitted into the lower surface of the top plate 3a of the key top 3.

The support member 13 has a pedestal 1 on the leg portion 12.
5, and an L-shaped locking piece 16 is provided protruding from the side of this pedestal 15. A bent end 6d or 6e of the interlocking rod 6 is fitted into the gap 17 between the pedestal 15 and the locking piece 16.
An inclined portion 18 is formed at the opposite end of the pedestal 15 to which the locking piece 16 is connected, and the gap 17
This makes it easy to insert the interlocking rod 6.

On the other hand, the engaging member 14 has a spanner-like shape at first glance, as shown in FIG. A bead portion 21 is formed on the back of the support portion 20.

The bead portion 21 supports the engaging member 14 by fitting into a groove portion 23 formed on the lower surface of a bracket 22 bonded to the lower surface of the top portion 3a.

Note that 24 is a spacer.

With this configuration, the twisted portion 6b of the interlocking rod 6 can be attached to the engaging member 14 before it is attached to the key top 3.
and then insert the engaging member 14 into the bracket 2.
Fits into 2. In other words, the top plate 3 of the key top 3
The twisted portion 6 is attached to the lower surface of a by the forked gripping portion 19.
The engaging member 14 is fitted while holding the interlocking rod 6, and the interlocking rod 6 is allowed to swing freely. Then, the bent ends 6d, 6 of the respective arm portions 6a, 6c of the interlocking rod 6 are
e on the inclined part 18, and press the switch pressing piece 4 of the key top 3 onto the key stem 2a of the switch body 2.
By pressing down the key top 3 so as to insert it into the bent ends 6d, 6e of the arm parts 6a, 6c.
is inserted into the gap 17 of the support member 13, and the assembly of the switch 10 is completed.

Further, when the key top 3 is removed from the switch body 2, the key top 3 is removed from the switch body 2 by simply lifting the key top 3.

As is clear from the above explanation, the switch of the present invention incorporates a key top with an interlocking rod swingably hanging down into the switch body, so that the arm part of the interlocking rod fits into the support member. This makes assembly easy. Additionally, the key top can be removed from the switch body by simply lifting it up.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a conventional switch, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is an exploded perspective view showing a conventional switch.
The figure is a sectional view of the main part of the switch according to the present invention, and FIG. 4 is a perspective view of the engaging member. DESCRIPTION OF SYMBOLS 1... Board, 2... Switch body, 3... Key top, 4... Switch pressing piece, 5... Switch, 6... Interlocking rod, 6a, 6c... Arm part, 6
b... Twisted portion, 6d, 6e... Bent end, 13
...supporting member, 14...engaging member, 16...locking piece.

Claims (1)

[Scope of utility model registration request] A switch body mounted on a circuit board, a key top with a switch pressing piece hanging down to be inserted into the key stem of the switch body, and an intermediate twisting part attached to the underside of the key top so that it can be attached and detached so as to be able to swing freely. and a support member provided on the substrate and having a locking piece into which a bent end of the interlocking rod is inserted and locked, and an upper surface of the support member. A switch characterized in that an inclined part is formed at the opposite end of the pedestal to which the locking piece is connected, and guides the bent end of the connecting rod toward the locking piece.