초록 ▼

A velocity change sensor comprises a body having a passage within which is a movable sensing mass normally maintained in an inactive position by a magnetic biasing force, but which is movable from its inactive position to an operating position in response to acceleration exceeding the biasing force.

A velocity change sensor comprises a body having a passage within which is a movable sensing mass normally maintained in an inactive position by a magnetic biasing force, but which is movable from its inactive position to an operating position in response to acceleration exceeding the biasing force. Movement of the mass is fluid damped to delay its movement to the operating position for a period of time during which the acceleration must exceed the biasing force.

대표청구항 ▼

In a sensor construction adapted for mounting on a vehicle or the like having an instrumentality to be operated in response to acceleration of said vehicle above a predetermined threshold, said sensor having a body provided with a tubular passage containing a fluid, a magnetically permeable sensing

In a sensor construction adapted for mounting on a vehicle or the like having an instrumentality to be operated in response to acceleration of said vehicle above a predetermined threshold, said sensor having a body provided with a tubular passage containing a fluid, a magnetically permeable sensing mass within said passage movable in response to acceleration of said vehicle from an initial position toward a second position in which said sensing mass initiates operation of said instrumentality, there being a clearance between said passage and said sensing mass of such size as to enable said fluid to damp movement of said sensing mass, the improvement comprising magnetic means exerting a predetermined magnetic bias force on said sensing mass and restraining movement of the latter from said initial position until said bias force is overcome by acceleration whereupon said sensing mass is movable relatively to said body toward said second position, said magnetic means being of such capacity as to continue to exert on said sensing mass a magnetic force of decreasing magnitude as said sensing mass moves toward its second position, the magnetic force exerted by said magnetic means on said sensing mass being sufficient to return the latter to said initial position from any other position short of said second position.