Pressure indicating devices
First Claim
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1. A pressure indicating device comprising a housing which includesan inlet for air under pressure;
- a permanently hermetically sealed chamber sealed during manufacture of the device, said chamber containing a gas under pressure;
a signaling device constructed and arranged to provide a signal that depends on pressure difference between the inlet and the chamber;
a flexible impermeable diaphragm separating the inlet and the chamber, the diaphragm constructed and arranged to flex and extend into the chamber as pressure at the inlet increases; and
a connecting means between the diaphragm and the signaling device to actuate the signaling device to provide a signal indicative of inlet pressure relative to pressure of the sealed chamber.
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Abstract
A pressure indicating device, e.g. for securing to a tire valve, is disclosed. The device includes a flexible impermeable diaphragm on one wall of a permanently hermetically sealed chamber is pressurized to a given pressure. A mechanical linkage moves depending on whether the pressure, e.g. in a tire to which the device is attached, is greater or less than that in the chamber, e.g., rotates a bicolored ball so that the color displayed provides a visual signal that indicates if the tire pressure is above or below the given pressure. This enables a puncture or air loss to be detected by a rapid glance.
30 Citations
15 Claims
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1. A pressure indicating device comprising a housing which includes
an inlet for air under pressure; -
a permanently hermetically sealed chamber sealed during manufacture of the device, said chamber containing a gas under pressure;
a signaling device constructed and arranged to provide a signal that depends on pressure difference between the inlet and the chamber;
a flexible impermeable diaphragm separating the inlet and the chamber, the diaphragm constructed and arranged to flex and extend into the chamber as pressure at the inlet increases; and
a connecting means between the diaphragm and the signaling device to actuate the signaling device to provide a signal indicative of inlet pressure relative to pressure of the sealed chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification