Pneumatic pressure indicator

Claim 2

A pneumatic pressure gauge comprising a. an elongated body having a passage extending therethrough along the entire length thereof, an inlet opening formed at one end of said body and in fluid communication with said passage, a seat formed within said passage, a piston valve slidably mounted within said passage said piston valve in contact with said seat for controlling the flow of gas through said seat and having a shaft connected thereto, a whistle aperture formed in said body and extending into said passage adjacent to said seat, a threaded rod having indicia thereon and a thumbengaging means at one end formed integrally therewith and an aperture at the opposite end said rod threadedly carried at the other end of said body within said passage, the end of said piston shaft slidable in said aperture, and a spring held between the end of said threaded rod and said piston valve, whereby, when said thumbscrew and rod are turned in said body, said spring adjustably biases said valve against said seat to a desired pressure, whereby, if the pressure of said gas in said passage is over said adjusted pressure, said valve will be moved against the action of said spring to open said seat and to allow gas to exit through said aperture with a whistling sound.

Claim 3

A pressure indicator comprising: a body having a passage extending therethrough, an inlet opening formed at one end of said passage for insertion over a fixed stem of a tire or the like for fluid communication therewith, an outlet passage formed in the side of said body and in fluid communication with said passage, a seat formed within said passage spaced from said inlet opening and above said inlet opening, pin means slidably mounted in said body between said outlet and said seat for controlling the flow of gas therebetween, a piston valve means having a rod connected thereto and slidably mounted within said passage in contact with said seat for controlling the flow of gas through said seat, said outlet passage comprising a whistle aperture formed in said body in connection with said passage and adjacent to said seat spaced from said inlet opening toward the other end of said body, the other end of said body having screw threads formed within said passage, a threaded shaft having an aperture at one end and a thumbscrew integrally formed at the other end and rotatably mounted within said threaded end, said piston rod slidably co-operating With said aperture in the threaded shaft, a spring mounted in said passage between said piston valve and said threaded shaft whereby, upon rotation of said shaft by said thumbscrew, said piston valve means will be adjustably biased against said seat, whereby upon application of pressurized gas to said inlet opening, said opening will have gas fed thereto and into a tire until said adjusted biasing force of said piston valve is reached, and, whereby, upon actuation of said pin means to its unblocked position, gas over said predetermined pressure will cause said valve to open to allow said gas at said excess pressure to pass through said seat and escape through said aperture whistle with a whistling sound.

Claim 4

A pressure indicator comprising: a body having a passage extending therethrough, an inlet opening formed at one end of said passage for insertion over a fixed stem of a tire or the like for fluid communication therewith, an outlet passage formed in the side of said body and in fluid communication with said passage, a seat formed within said passage spaced from said inlet opening and above said inlet opening, pin means slidably mounted in said body between said outlet and said seat for controlling the flow of gas therebetween, a piston valve means having a rod connected thereto and slidably mounted within said passage in contact with said seat for controlling the flow of gas through said seat, said outlet passage comprising a whistle aperture formed in said body in connection with said passage and adjacent to said seat spaced from said inlet opening toward the other end of said body, the other end of said body having screw threads formed within said passage, a threaded shaft having an aperture at one end and a thumbscrew integrally formed at the other end and rotatably mounted within said threaded end, said piston rod slidably co-operating With said aperture in the threaded shaft, a spring mounted in said passage between said piston valve and said threaded shaft whereby, upon rotation of said shaft by said thumbscrew, said piston valve means will be adjustably biased against said seat, whereby upon application of pressurized gas to said inlet opening, said opening will have gas fed thereto and into a tire until said adjusted biasing force of said piston valve is reached, and, whereby, upon actuation of said pin means to its unblocked position, gas over said predetermined pressure will cause said valve to open to allow said gas at said excess pressure to pass through said seat and escape through said aperture whistle with a whistling sound.