Mechanically-resetting tire deflation signalling system

Claim 2

In a vehicle tire deflation signalling system comprising and electrical circuit adapted to energize a signal and a switch with an activator arm in the circuit controlling the signal and mounted on the vehicle chassis, a substantially cylindrical housing carried by a wheel of the vehicle, a plunger in the housing adapted to be projected therefrom into a path intersected by said switch activator arm, yielding means for projecting said plunger into said path, a detent for restraining said plunger in a position retracted from said path, and a pressure-differentialresponsive valve operatively communicating with the interior of the tire and adapted to retract said detent to release said plunger for projection into said path to activate said switch in response to dimunution of pressure in the tire to less than a predetermined value.

Claim 3

Apparatus as defined in claim 1 including means presenting camming surfaces carried by said vehicle chassis and projecting into said path intersected by said switch activator arm, operative when engaged by said plunger after it has been projected from said housing to return said plunger toward said housing for retention therein by said detent when pressure in said tire has been restored to a normal value.

Claim 4

Apparatus as defined in claim 1 in which said plunger carries a piston normally projecting from the housing in the direction oppositely from said path slideable into said housing when said plunger is releasEd by said detent.

Claim 5

Mechanically resetting tire deflation signalling system apparatus comprising tire-pressure-differential responsive means, mechanical sensor means coupled to said pressure-differential-responsive means carried by a moving structure movable relatively to said structure into a path abnormal with respect to said structure, a relatively stationary signal-activating element interposed in said path for actuation by said mechanical sensor means when in said abnormal path, and yielding means for projecting said mechanical sensor means into said abnormal path in response to pressure-differential actuation of said pressure-differential-responsive means, said mechanical sensor means movable into said abnormal path comprising a spring-biased plunger and said pressure-differential-responsive means including a detent engageable with said plunger operative when in engagement therewith to restrain its movement in response to the bias of its spring.

Claim 6

Mechanically resetting tire deflation signalling system apparatus comprising tire-pressure-differential responsive means, mechanical sensor means coupled to said pressure-differential-responsive means carried by a moving structure movable relatively to said structure into a path abnormal with respect to said structure, a relatively stationary signal-activating element interposed in said path for actuation by said mechanical sensor means when in said abnormal path, and yielding means for projecting said mechanical sensor means into said abnormal path in response to pressure-differential actuation of said pressure-differential-responsive means, said mechanical sensor means movable into said abnormal path comprising a spring-biased plunger and said pressure-differential-responsive means including a detent engageable with said plunger operative when in engagement therewith to restrain its movement in response to the bias of its spring.