Browse Prior Art Database

Movement Alarm

IP.com Disclosure Number: IPCOM000079163D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Peterson, LE: AUTHOR

Abstract

Any shock or sudden movement activates an alarm.

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Movement Alarm

Any shock or sudden movement activates an alarm.

A flexibly-mounted permanent magnet is moved in the direction of the arrows by a change in velocity of a support on which the magnet is mounted. Current is induced in a pickup coil by movement of the permanent magnet. The induced current is amplified and compared to a threshold value or other external condition. If the threshold is exceeded, the signal operates a signal source. For example, the signal gate output may be integrated to operate an oscillator which in turn blows a horn.

When the movement of the permanent magnet subsides, the signal device stops or, if desired, continues until separately discontinued.

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