US3738308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system for pneumatic tires
Assignee: SAFETY RESEARCH & ENGINEERING ASSOCIATES 5 WESTCHESTER DRIVE NORTH READING MASSACHUSETTS 01864
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Filing: 1971-05-21
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Granted: 1973-06-12
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Expires: 1991-05-21
Abstract
Abstract A system is provided for use with various types of vehicles employing pneumatic tires to signal the operator that the tire pressure is beyond a preset range. A spring-loaded pressure responsive piston is adapted to reciprocate within a valve structure in response to changes in tire pressure. If the piston is displaced one way or other beyond the predetermined range, air is released to operate a whistle detected by a sensing system on the vehicle which, in turn, generates a signal for the operator.
Inventors
- 👤 W Barabino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0401; B60C23/0403; B60C23/0408; B60C23/0422; B60C23/0469; F; F16; F16K; F16K37/00; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3662
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A pressure warning device for a pneumatic tire, comprising a. a housing formed with a cylindrical chamber therein one end of which being in communication with the interior of said tire and the opposite end thereof being exterior of said tire, b. a spring-loaded piston mounted in said chamber and being axially movable in response to changes in tire pressure, c. said piston being formed with a passage communicating with the interior of said tire, d. at least one of said housing and said piston being formed with a plurality of axially spaced ports and the other of said housing and said piston being formed with at least one port, the piston ports being in communication with said passage whereby excess movement of said piston will align certain of said ports to release air from said tire, e. whistle means communicating with said ports and actuated by release of air from said tire and, f. a check valve mounted directly to the outer end of said piston and communicating with said piston passage.
Claim 2
Dependent Claim
173 words
A pressure warning device for a pneumatic tire, comprising a. a housing formed with a cylindrical chamber therein one end of which being in communication with the interior of said tire and the opposite end thereof being exterior of said tire, b. a spring-loaded piston mounted in said chamber and being axially movable in response to changes in tire pressure, c. said piston being formed with a passage communicating with the interior of said tire, d. at least one of said housing and said piston being formed with a plurality of axially spaced ports and the other of said housing and said piston being formed with at least one port, the piston ports being in communication with said passage whereby excess movement of said piston will align certain of said ports to release air from said tire, e. whistle means communicating with said ports and actuated by release of air from said tire and, f. a check valve mounted directly to the outer end of said piston and communicating with said piston passage.
Claim 3
Dependent Claim
51 words
A pressure warning device according to claim 1 including an apertured cover removably mounted over the exterior portion of said housing and a movable member mounted to said cover and displaceable in response to release of air from said tire from a hidden position in said cover to an exposed position.
Claim 4
Dependent Claim
14 words
A pressure warning device according to claim 2 wherein said member is a whistle.
Claim 5
Dependent Claim
22 words
A pressure warning device according to claim 1 wherein said housing is formed with a restricted orifice at the inner end thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |