JPH01129737U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is an enlarged sectional view taken along the - line in Figure 2;
Figure 2 is an overall perspective view of the telephone according to the present invention, Figure 3 is an enlarged cross-sectional view of the main parts of Figure 1 during manual operation, and Figure 4 is the main parts of other parts of Figure 1 during manual operation. FIG. 5 is an enlarged sectional view of a conventional key switch structure. 1... Upper case, 1a... Guide hole, 1b...
Pivot support, 2... Key top, 2b... Fulcrum shaft, 3
...Printed circuit board, 6...Elastic material sheet, 6a...
...Contact part, 6c...Reducing elasticity.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of key tops are movably supported with respect to the upper case, and the key tops are attached to the contact portions of an elastic sheet laminated on the surface of a printed circuit board fixed inside the upper case. In the key switch structure in which each key top faces out, a fulcrum shaft integrally molded on each key top is dropped into a pivot support on the back side of the upper case to make each key top rotatable, and a plurality of fulcrum shafts integrally molded on the elastic sheet A key switch structure characterized by inserting an elastic retainer into each shaft support to prevent each support shaft from being pulled out. (2) The key switch structure according to claim 1, wherein the fulcrum shafts have a semicircular cross section, and the tip surfaces of corresponding elastic restrainers are pressed against the chord surfaces of these fulcrum shafts. (3) Each of the key tops has operating protrusions on the surface of the contact portion, and the tips of these operating protrusions are brought into point contact with the surface of the corresponding contact portion. Keyswitch structure as described.