Locking arrangement with burglar alarm

Details Locking arrangement with burglar alarm Locking arrangement with burglar alarm

1976-01-21

1977-06-14

Kozma, Thomas J.

Electricity: circuit makers and breakers

Special application

70DIG49, 200 6166, 340274R, H01H 3500

Patent

active

040299198

ABSTRACT:
A cylinder lock is provided with a contact carrier for the movable contact of a switch in an electrically operated burglar alarm. A spring mounted on the contact carrier and radially projecting from the casing of the lock is stressed by engagement with the wall of the door aperture receiving the lock and biases the contact carrier toward a switch opening position. When it is attempted to pull the lock from the door, the spring pivots the contact carrier and the alarm is energized.

REFERENCES:
patent: 3587080 (1971-06-01), Hawkins

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