초록 ▼

A digital readout gauge is disclosed which, for example, may be a tire pressure gauge which is mounted in a small portable housing. A pressure chamber is formed within the housing with a valve core deflator mounted within the housing to depress the core of a standard tire valve and permit the air pr

A digital readout gauge is disclosed which, for example, may be a tire pressure gauge which is mounted in a small portable housing. A pressure chamber is formed within the housing with a valve core deflator mounted within the housing to depress the core of a standard tire valve and permit the air pressure within the tire to be introduced into the chamber. A wall of the chamber is movable with changes of pressure and a piezoelectric crystal transducer or strain gauge transducer is mounted to be stressed in accordance with movement of this wall to develop an analog voltage in accordance with the air pressure. An electrical circuit is contained within the housing and energizable by a battery carried within the housing. A power switch is actuated to an on condition by movement of the gauge onto the tire valve to energize the electrical circuit with the analog voltage passed to an analog-to-digital converter and then to a digital readout display to display the digital value of the air pressure within the tire. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

대표청구항 ▼

A digital readout gauge, comprising, in combination, a housing, a chamber in said housing, wall means in said chamber movable with changes of force on said wall means, means to apply a changeable force on said wall means, an electrical circuit in said housing, a battery in said housing and connected

A digital readout gauge, comprising, in combination, a housing, a chamber in said housing, wall means in said chamber movable with changes of force on said wall means, means to apply a changeable force on said wall means, an electrical circuit in said housing, a battery in said housing and connected to supply power to said electrical circuit, said electrical circuit including a transducer mounted to be stressed in accordance with movement of said movable wall means, output conductors connected to said transducer to generate an analog voltage thereacross upon stressing of said transducer, an analog-to-digital converter connected to receive a voltage in accordance with te voltage on said output conductors to convert the analog signal of said transducer voltage output into a digital signal, and a digital readout display connected to the output of said converter to display a digital value in accordance with the transducer voltage output.