Pushbutton lock

Details Pushbutton lock Pushbutton lock

1981-02-04

1984-05-29

Pitts, Harold I.

179189R, 70DIG72, H04M 166

Patent

active

044517130

ABSTRACT:
The pushbutton lock is used to lock one or more selected pushbuttons on a pushbutton type of telephone in order to prevent the making of unauthorized calls from that telephone. The locking of pushbuttons in other types of keysets also is described. A cover for one or more pushbuttons is secured in place by a gripping mechanism which grips at least two opposite sides of one or more of the pushbuttons when a lock cylinder is turned. The lock actuating mechanism is located vertically above the gripping mechanism so that the cover can be made small enough to fit around one or two of the pushbuttons and leave the others exposed for use, if desired.

REFERENCES:
patent: 3624317 (1971-11-01), Buckingham
patent: 3866000 (1975-02-01), Gillis
patent: 3899647 (1975-12-01), Nachsi et al.
patent: 4028508 (1977-06-01), Hall
patent: 4081630 (1978-03-01), Washburn et al.
patent: 4131769 (1978-12-01), Davis
patent: 4297539 (1981-10-01), Fairbanks
patent: 4304971 (1981-12-01), Flax
patent: 4323739 (1982-04-01), Flax et al.
IBM Technical Disclosure Bulletin, vol. 20, No. 11A--Apr. 1978, "Keyboard Lock Mechanism" by R. G. Duranske (pp. 4516-4517).

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