US3593268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pressure warning device for pneumatic units
Assignee: Individual
•
Filing: 1968-12-17
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Granted: 1971-07-13
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Expires: 1988-12-17
Abstract
Abstract An improved automatic warning device for tires to identify pressures outside of predetermined ranges. The device is secured to a standard valve stem. An opening in a plug allows the interior tire pressure to bear against a spring biased plunger. The biasing force of the spring is varied by adjustment of a screw member. The plunger rod bears against a spring biased conductor and in the normal state, the rod maintains the conductor out of electrical contact. If the pressure falls below a certain level the plunger rod withdraws away from the conductor, and the conductor is moved by its biasing means into electrical contact. If the pressure rises above a certain level, the plunger rod bears more strongly against the conductor, and the conductor is moved against its biasing means in the opposite direction and into electrical contact.
Inventors
- 👤 John A Arvan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:36
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0491; B60C23/0496; B60C23/0408; B60C23/0422; B60C23/0467
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
189 words
An improved automatic warning device for pneumatic units to identify pressures outside of a predetermined range comprising: a. a housing secured to an outlet from the pneumatic unit providing the device from a signal at all times equivalent with the pressure within the unit; b. plunger means within the housing responsive to the pressure within the pneumatic unit, the plunger means having a rod; c. compression spring means urging said plunger toward the outlet; d. adjustment means within the housing to vary the forces within the spring, said means being adjustably spaced from the plunger means and locating the compression spring therebetween; and e. a closure cap assembly detachably secured to the housing; f. contact means within the cap assembly, said means including a conducting cup and a second compression spring urging said cup toward the outlet, said cup being movable from a first contact position to a second contact position, the rod of the plunger means engaging the cup to move said cup from the first contact position to a median position without contact, and to the second contact position, depending on the pressure within the pneumatic unit.
Claim 2
Dependent Claim
189 words
An improved automatic warning device for pneumatic units to identify pressures outside of a predetermined range comprising: a. a housing secured to an outlet from the pneumatic unit providing the device from a signal at all times equivalent with the pressure within the unit; b. plunger means within the housing responsive to the pressure within the pneumatic unit, the plunger means having a rod; c. compression spring means urging said plunger toward the outlet; d. adjustment means within the housing to vary the forces within the spring, said means being adjustably spaced from the plunger means and locating the compression spring therebetween; and e. a closure cap assembly detachably secured to the housing; f. contact means within the cap assembly, said means including a conducting cup and a second compression spring urging said cup toward the outlet, said cup being movable from a first contact position to a second contact position, the rod of the plunger means engaging the cup to move said cup from the first contact position to a median position without contact, and to the second contact position, depending on the pressure within the pneumatic unit.
Claim 3
Dependent Claim
22 words
The invention according to claim 1, wherein the conducting cup has a detent sized to receive the rod of the plunger means.
Claim 4
Dependent Claim
56 words
The invention according to claim 1, further including an insulating sleeve surrounding said cup and second spring, a second conducting cup telescoping over said sleeve and having a shoulder portion forming the first contact position, and a conducting washer abutting said second conducting cup and spaced from the shoulder portion thereof forming the second contact position.
Claim 5
Dependent Claim
63 words
The invention according to claim 1, wherein said adjustment means comprises a screw member having a seat in one end to receive the compression spring and a stem portion at the other end thereof, said screw member being located intermediate the plunger means and the closure cap assembly and having a through-opening therein, the rod of said plunger means passing through said opening.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |