Leakage warning device for vehicle tire

Claim 1

An air leakage warning device for a pneumatic tire comprising: a substantially cylindrical whistle-producing member having an enlarged shoulder on the lower portion thereof; a cylinder member containing piston means, a coil spring surrounding the same and responsive to a predetermined pressure within the tire, a perforated disk plate covering the upper end thereof, a perforated shoulder carried by said piston and retaining said coil spring between the same and said disk plate, the upper end of the cylinder member being inter-connected with the shoulder portion of the whistle-producing member and said perforated disk plate, and the lower end thereof having internal threads adapted to be screwed onto a conventional air filling valve stem of the tire; a rubber sack enveloping the whistleproducing member and the cylinder member and forming a receiver for escaping air from the tire and adapted to be ruptured by air pressure so as to emit an audiblE signal, said rubber sack having an inwardly directed annular rim integrally formed on the circumference of the sack opening; a base member including a recess and an internal thread adapted to be screwed onto the lower exterior end of the cylinder member with said rim and the lower end of said rubber sack sandwiched therebetween, thereby tightly securing the rubber sack to the cylinder member; the whistle-producing member being provided with a radially extending plate on the inside of said whistle member and an air outlet port formed on the wall of said whistle member.