Remote pressure indicator for sealed vessels including vehicle tires
First Claim
1. ) A magnetically coupled pressure gauge for indicating pressure within a pressure vessel outside the pressure vessel, comprising in combination, (a) sender means for providing a magnetic field having a specific direction mounted for rotation about a rotating axis within the pressure vessel, the specific direction of the provided magnetic field rotating with the sender means in a plane parallel to an axis of symmetry of the provided magnetic field;
- (b) a pressure actuated bellows mechanism mounted within the pressure vessel coupled for rotating the sender means; and
(c) sensor means for sensing and indicating the specific direction of the magnetic field provided by the sender means outside the pressure vessel.
1 Assignment
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Accused Products
Abstract
A compact, robust, and inexpensive magnetically coupled pressure gauge includes a spiral-faced or helical bellows coupled for rotating a magnetic field source (permanent magnet) within a pressure vessel the orientation of which is externally sensed and correlated to pressure within the pressure vessel. Mechanisms of extraneous magnetic field compensation are discussed Applications contemplated include measuring pressure in pressure vessels and pressure of pneumatic vehicle tires without breaching the integrity of the particular pressurized vessels. Embodiments included a visual, manual tire pressure monitoring system.
5 Citations
23 Claims
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1. ) A magnetically coupled pressure gauge for indicating pressure within a pressure vessel outside the pressure vessel, comprising in combination,
(a) sender means for providing a magnetic field having a specific direction mounted for rotation about a rotating axis within the pressure vessel, the specific direction of the provided magnetic field rotating with the sender means in a plane parallel to an axis of symmetry of the provided magnetic field; -
(b) a pressure actuated bellows mechanism mounted within the pressure vessel coupled for rotating the sender means; and
(c) sensor means for sensing and indicating the specific direction of the magnetic field provided by the sender means outside the pressure vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. ) A method for externally sensing pressure within a pressure vessel with a magnetic field, comprising the steps of:
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(a) mounting a magnetic field source for rotation within the pressure vessel providing a magnetic field having an axis of symmetry rotating in a particular plane;
(b) coupling the magnetic field source to a pressure actuated bellows expanding and contracting responsive to pressure differences Δ
p between fluid pressure with the pressure vessel and a known fluid pressure, the expansion and contraction of the bellows rotating the magnetic field source in opposite directions respectively;
(c) sensing the orientation of the axis of symmetry of the magnetic field source outside the pressure vessel; and
(d) correlating the orientation of the axis of symmetry of the magnetic field sensed to pressure within the pressure vessel. - View Dependent Claims (23)
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Specification