Lock with alarm device

Details Lock with alarm device Lock with alarm device

1990-06-20

1991-08-20

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

70438, 200 6166, 340521, E05B 4506, H01H 2706

Patent

active

050418149

ABSTRACT:
A door lock is provided with three alarm switches for activating an alarm system. The first switch has a first pair of contacts which are formed by a spring urging a tumbler pin and a metallic sleeve in which the spring is inserted. The second switch has a second pair of contacts which are urged toward each other and disposed on two opposite sides of a tongue connected to a tumbler for oeprating a lock bolt. The third switch has a third pair of contacts operable by a slide bar slidably disposed along the lock bolt. When an attempt is made to pick the lock, the first switch is closed to activate the alarm system; when an attempt is made to pull the lock cylinder out of the door, the second switch is closed to activate the alarm system; and when an attempt is made to pry open the door, the third switch is closed to activate the alarm system.

REFERENCES:
patent: 3587080 (1971-06-01), Hawkins
patent: 3810145 (1974-05-01), Gusaras
patent: 3986376 (1976-10-01), Lack
patent: 4186578 (1980-02-01), Sommer
patent: 4370644 (1983-01-01), Droz
patent: 4803460 (1989-02-01), Rhee et al.

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