Vehicle anti-theft alarm
AssigneeMartek Products, Inc.
InventorCurtis Morgan
Life of this patent
Estimating the term…
Abstract
An anti-theft alarm system for movable objects, particularly motorcycles, and actuated by mechanical disturbance, e.g., by using tools on a vehicle, moving it off its stand, or operating it. The primary disturbance sensors are steel balls or the like in small compartments inside which they are free to roll. Impacts of one or more balls against compartment walls generate pulses of high-frequency sound and vibration, which are in turn sensed by an adjacent high-frequency microphone or vibration pickup. The output of this transducer is then amplified and suitably processed to energize a horn or other alarm device.
Claims7
An alarm system for a movable object and responsive to its acceleration, comprising:
- a housing with means to attach it to said object;
- a first cavity in said housing, and having walls and a striker of hard material, free to move inside said cavity to produce impacts on the wall thereof in response to acceleration of said housing, said impacts generating high-frequency sound and vibration inside said housing;
- a transducer in said housing disposed so as to sense said sound or vibration and having electrical output terminals connected to the input of an amplifier;
- and
- control circuitry comprising signal-processing and relay circuits fed from the output of said amplifier and having output terminals connected so as to actuate an alarm in response to said impacts.
Dependencies are inferred from the claim text.