Leakage warning device for pneumatic tire

An air leadage warning device for a pneumatic tire comprisng:

• a housing member including in longitudinal direction a cylindrical intermediate section, an enlarged cylindrical lower section connected to the cylindrical intermediate section through a shoulder portion, and a four-sided upper section having a circular opening at its top end;
• a cylinder member containing a perforated piston means and a coil spring responsive to a predetermined pressure within the tire and a perforated disk-plate covering the upper end thereof, the upper end of the cylinder member being inter-connected with the lower section of the housing member while the lower end thereof is provided with
• internal threads adapted to be screwed onto a conventional air filling valve stem of the tire;
• a rubber sack enveloping the housing member and the cylinder member and forming a receiver for escaping tire air and adapted to be ruptured by
• air pressure so as to emit an audible signal, the rubber sack having an inwardly directed annular rim integrally formed on the circumference of the sack opening;
• a base member adapted to be screwed onto the lower end of the cylinder member with the rim and the lower end of the rubber sack sandwiched therebetween thereby tightly secure the rubber sack against the cylinder member;
• and further comprising a rubber ball freely movable inside the cylindrical intermediate section in order to block the opening of the housing member and thus prevent further escape of air immediately after the rubber sack is ruptured by the pressure of the escaping tire air.

An air leakage warning device for a pneumatic tire comprising:

• a housing member including in longitudinal direction a cylindrical intermediate section, an enlarged cylindrical lower section connected to the intermediate section through a shoulder portion, and a four-sided upper section having a circular opening at its top end;
• a cylinder member containing a perforated piston means and a coil spring responsive to a predetermined pressue within the tire and a perforated disk plate covering the upper end thereof, the upper end of the cylinder member being interconnected with the lower section of the housing member while the lower end thereof is provided with
• internal threads for connection;
• a head having a threaded bore for receiving a conventional air filling valve of the tire and an axial guide opening at the uppermost end thereof, the head being adapted to be screwed into the lower end of the cylinder member;
• a cap member having an air escape opening and a downward projection and being disposed axially within the head;
• a seal member in the cap member for engaging the inner surface of the head so as to normally cover the opening at the uppermost end of the head;
• a rubber sack enveloping the housing member and the cylinder member and forming a receiver for escaping tire air and adapted to be ruptured by air pressure so as to emit an audible signal, the rubber sack having an inwardly directed annular rim integrally formed on the circumference of the sack opening;
• a base member adapted to be screwed onto the lower end of the cylinder member with the rim and the lower end of the rubber sack sandwiched therebetween thereby tightly secure the rubber sack against the cylinder member;
• and further comprising a rubber ball freely movable inside the cylindrical intermediate section in order to block the opening of the housing member and thus prevent further escape of air immediately after the rubber sack is ruptured by the pressure of the escaping tire air.