US4048614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low tire pressure warning device
Assignee: Individual
•
Filing: 1977-01-05
•
Granted: 1977-09-13
•
Expires: 1997-01-05
Abstract
Abstract A pressure detector and radio transmitter component of a tire pressure warning system for a wheeled vehicle, with the component being associated with a tubeless vehicle tire by being mounted on the wheel rim on which the tire is mounted so that the component is wholly located in the sealed space formed by the interior of the tubeless tire and the wheel rim on which the tire is mounted.
Inventors
- 👤 Harry J. Shumway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:53
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0491; B60C23/0494; B60C23/0408
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
A tire pressure alarm system for a vehicle having a wheel with a rim forming an annular well of a predetermined depth, said rim being adapted to receive a tire to form therewith an airtight chamber, said rim having an air inlet valve having a first end outside said airtight chamber and a second end inside said airtight chamber, said alarm system including an elongated operative component adapted to be removably connected to said second end and located entirely within said airtight chamber, so that the elongated direction of said operative component is substantially parallel to the axis of rotation of said wheel, said operative component including an air chamber adapted to receive air from said airtight chamber, said operative component further including an actuable radio transmitter and power source therefor situated within the air chamber, and a switch and diaphragm means, said switch being situated along said elongated direction so as to be substantially impervious to centrifugal force due to rotation of said wheel, said switch and diaphragm means being responsive to the air pressure in said air chamber to close said switch to actuate said transmitter when said air pressure is at a predetermined low pressure.
Claim 2
Dependent Claim
198 words
A tire pressure alarm system for a vehicle having a wheel with a rim forming an annular well of a predetermined depth, said rim being adapted to receive a tire to form therewith an airtight chamber, said rim having an air inlet valve having a first end outside said airtight chamber and a second end inside said airtight chamber, said alarm system including an elongated operative component adapted to be removably connected to said second end and located entirely within said airtight chamber, so that the elongated direction of said operative component is substantially parallel to the axis of rotation of said wheel, said operative component including an air chamber adapted to receive air from said airtight chamber, said operative component further including an actuable radio transmitter and power source therefor situated within the air chamber, and a switch and diaphragm means, said switch being situated along said elongated direction so as to be substantially impervious to centrifugal force due to rotation of said wheel, said switch and diaphragm means being responsive to the air pressure in said air chamber to close said switch to actuate said transmitter when said air pressure is at a predetermined low pressure.
Claim 3
Dependent Claim
24 words
An operative component as defined in claim 1 in which said switch includes two parallel plates having faces situated perpendicular to said elongated direction.
Claim 4
Dependent Claim
31 words
An operative component as defined in claim 1 in which said power source, said transmitter, said switch and said diaphragm are positioned serially within said air chamber along the elongated direction.
Claim 5
Dependent Claim
33 words
An operative component as defined in claim 1 in which one side of said air chamber is easily removable to permit access to said power source, said transmitter, said switch and said diaphragm.
Claim 6
Dependent Claim
23 words
An operative component as defined in claim 1 further including means adjustable from outside said operative component for adjusting said predetermined low pressure.
Claim 7
Dependent Claim
25 words
An operative component as defined in claim 1 in which said operative component is connected to said second end by means of a screw thread.
References Cited (Backward Citations)
US3810090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |