Spring loop door and window alarm switch

Details Spring loop door and window alarm switch Spring loop door and window alarm switch

1978-09-05

1980-09-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6174, 200 6176, 200 6193, 340546, G08B 1308

Patent

active

042258570

ABSTRACT:
A strip of conductive spring material is formed in a loop with extending ends adapted to be clamped together by closed doors and windows. In one embodiment, a conductive rod member has a hook at one end, the other end of the rod member being fixedly connected to one side of the loop, the hooked end extending through a hole in the other side of the loop. An apertured contact member is mounted on and insulated from the outside of the other side of the loop. The loop is unclamped when the door or window is opened and a circuit is completed between the hooked end and the contact. In another embodiment, the loop is positioned between two stationary contacts, being permanently attached to the first one of the contacts. When the extended ends are clamped, the loop does not touch the second contact, but when the ends are unclamped, the loop bridges the two fixed contacts to complete an alarm circuit.

REFERENCES:
patent: 423753 (1890-03-01), Gee
patent: 627192 (1899-06-01), Johnson
patent: 798803 (1905-09-01), Kreh
patent: 1305190 (1919-05-01), Bobo
patent: 3597555 (1971-08-01), Gould

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