AIR PRESSURE BALANCED SELF-CONTAINED TIRE PRESSURE CONDITION SIGNAL TRANSMITTER

摘要

This invention relates to a fluid pressure alarm for use primarily on vehicle tires including a self-contained powered radio transmitter in a cylindrical housing threaded on the inflation stem of the vehicle tire, the housing having means maintaining pressure communication between the interior of the tire and that of the housing, and a pressure responsive switch device biased by control pressure in a control pressure compartment of the housing and movable to energize the transmitter upon a predetermined pressure differential between that of the control compartment and that of the vehicle tire, the radio signal to be picked up by a receiver in the cab of the vehicle. it can be used as a pressure differential alarm on other pressurized gas or liquid environments.