Spring-actuated security alarm for a door

Details Spring-actuated security alarm for a door Spring-actuated security alarm for a door

1975-03-19

1976-07-06

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 6182, 200 6193, G08B 1308

Patent

active

039684849

ABSTRACT:
A security alarm device includes a housing of an electrically conductive material having a horizontal bottom base, a pair of upwardly extending end walls; a front face, and an upper end. An elongated rod member of an electrically conductive material having a threaded outer surface threadably engages a threaded hole in the bottom base and an opening in the top, wherein an end of an elongated bar member is affixed into a center transverse aperture of the rod member. An electric contact point within the housing communicates with bar member as it rotates within the housing causing the electric series circuit of the security alarm device to open and close. The series circuit of the security alarm device consists of a power source, an on/off switch, an alarm, the contact point, the housing, the rod member and the bar member. A mounting plate affixed onto the housing is adapted to be received by the door frame. The other end of the bar member protrudes through a slot aperture in the front face of the housing and is adapted to communicate with an inwardly swinging door.

REFERENCES:
patent: 2281193 (1942-04-01), Hollingsworth
patent: 3029425 (1962-04-01), Forrester
patent: 3567882 (1971-03-01), Beck

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