Lockout telephone

Details Lockout telephone Lockout telephone

1995-06-07

1996-10-08

Zele, Krista M.

Telephonic communications

Call or terminal access alarm or control

At substation

379445, 379355, 379184, 379216, H04M 166

Patent

active

055639364

ABSTRACT:
A lockout telephone comprising a keyswitch for controlling the operation of the telephone's push button keypad and speed dial buttons. The telephone can have a keyswitch with either ON and OFF positions or ON, SPEED DIAL ONLY, and OFF positions. When the keyswitch is in the ON position, the telephone is fully operational. When the keyswitch is in the SPEED DIAL ONLY position, only the speed dial buttons are operational. When the keyswitch without a SPEED DIAL ONLY position is in the OFF position, only the the keypad is inoperative. When the keyswitch with ON, SPEED DIAL ONLY, and OFF positions is in the OFF position, both the keypad and speed dial buttons are inoperative. The lockout telephone can also have an emergency dial button which is always operational, regardless of the keyswitch position.

REFERENCES:
patent: 3702903 (1972-11-01), Barton
patent: 4297534 (1981-10-01), Epstein et al.
patent: 4451713 (1984-05-01), Wittes
patent: 4453042 (1984-06-01), Wolf et al.
patent: 4482787 (1984-11-01), Sagara et al.
patent: 4860339 (1989-08-01), D'Agosto, III et al.
patent: 4866764 (1989-09-01), Barker, III
patent: 4924499 (1990-05-01), Serby
patent: 4924512 (1990-05-01), Sizemore et al.
patent: 4965459 (1990-10-01), Murray
patent: 4975943 (1990-12-01), Weber et al.
patent: 5029197 (1991-07-01), Hashimoto
patent: 5200995 (1993-04-01), Gaukel et al.

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