Cranford alert system - burglar alarm
OwnerBarbara J. Cranfordinventor
Life of this patent
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Abstract
A locking arrangement with built-in alarm mechanism utilizing a contact between portions of a split bolt arrangement as the prime security measure is described. Correct sequencing of both the locking and unlocking actions is required to prevent alarm. Two realizations are described: a self-contained unit for building doors; and an automobile unit with central alarm, alarm sensors for ignition and other locations subject to tampering (hood, trunk, battery), and a set resistance method to prevent disarming by either circuit opening or shorting techniques.
Claims9
An Alarmed Lock System comprising:
- a first lock tumbler;
- a first bolt, wherein movement of said first bolt is controlled by said first lock tumbler;
- a second lock tumbler;
- a second bolt, wherein movement of said second bolt is controlled by said second lock tumbler;
- an electrical contact located on said first bolt for providing an electrical connection between said first bolt and said second bolt when said first bolt is in a first position with respect to said second bolt;
- insulating means located on said second bolt for breaking said electrical connection when said first bolt is in a second position with respect to said second bolt;
- and
- an alarm device responsive to the state of said electrical connection.
An Alarmed Lock System for use with a vehicle having a seat belt locking sensor, comprising:
- a first bolt;
- a second bolt;
- an electrical contact located on said first bolt for providing an electrical connection between said first bolt and said second bolt when said first bolt is in a first position with respect to said second bolt;
- insulating means located on said second bolt for breaking said electrical connection when said first bolt is in a second position with respect to said second bolt;
- and
- an alarm device responsive to the state of said electrical connection;
- wherein said alarm device has a first mode of operation for use when said vehicle is parked wherein a signal provided by said seat belt locking sensor causes said alarm device to provide an alarm signal, and a second mode of operation for use when said vehicle is in operation wherein said signal provided by said seal belt locking sensor causes said alarm device to be temporarily disabled.
A Lock for an alarm system responsive to the state of an electrical connection, comprising:
- a first bolt;
- a first lock tumbler, wherein movement of said first bolt is controlled by said first lock tumbler;
- a second bolt;
- a second lock tumbler, wherein movement of said second bolt is controlled by said second lock tumbler;
- an electrical contact located on said first bolt for providing said electrical connection between said first bolt and said second bolt when said first bolt is in a first position with respect to said second bolt;
- and
- insulating means located on said second bolt for breaking said electrical connection when said first bolt is in a second position with respect to said second bolt.
Dependencies are inferred from the claim text.