US3933359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle leveling device
Assignee: Individual
•
Filing: 1974-09-23
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Granted: 1976-01-20
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Expires: 1994-09-23
Abstract
Abstract A vehicle leveling system in which the four ends of the axles of a vehicle have air-lift type shock absorbers into which compressed air can be injected or removed. Each of the shock absorbers are connected by tubing to a central chamber which is level with the vehicle floor. Inside of the chamber is a heavy plumb bob which comprises a vertical shaft suspended by a flexible straight wire. The bob is an inverted truncated cone. The supporting wire is sealed through the closed roof of the chamber and can be raised and lowered. Four valves are placed around the circumference of the chamber, 90 degrees apart, with valve stems that project radially inwardly, and are just barely in contact with the circumferential surface of the plumb bob.
Inventors
- 👤 Arthur G. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/0152; B60G17/0155; B60G21/00; B60G21/02; B60G21/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0923
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A vehicle leveling system comprising a. a vehicle having a frame to be maintained in a horizontal position, said frame having at least three spaced points of support; b. pressure fluid lift cylinder means in each of said points of support, said lift cylinder means connected by conduit to a pressure fluid control chamber; c. said pressure fluid control chamber comprising a cylinder having a base attached to said frame to be coplanar therewith; d. a plumb bob axially supported in said chamber by a flexible wire, said plumb bob in the shape of an inverted truncated cone; e. a plurality of at least three valves mounted circumferentially spaced in the wall of said chamber at a selected horizontal plane relative to said plumb bob, and valve stems projecting inwardly from each valve to the surface of said plumb bob when said base is horizontal, said valves connected by said conduits to said lift cylinders; and f. means to provide pressure fluid to the interior of said control chamber.
Claim 2
Dependent Claim
169 words
A vehicle leveling system comprising a. a vehicle having a frame to be maintained in a horizontal position, said frame having at least three spaced points of support; b. pressure fluid lift cylinder means in each of said points of support, said lift cylinder means connected by conduit to a pressure fluid control chamber; c. said pressure fluid control chamber comprising a cylinder having a base attached to said frame to be coplanar therewith; d. a plumb bob axially supported in said chamber by a flexible wire, said plumb bob in the shape of an inverted truncated cone; e. a plurality of at least three valves mounted circumferentially spaced in the wall of said chamber at a selected horizontal plane relative to said plumb bob, and valve stems projecting inwardly from each valve to the surface of said plumb bob when said base is horizontal, said valves connected by said conduits to said lift cylinders; and f. means to provide pressure fluid to the interior of said control chamber.
Claim 3
Dependent Claim
17 words
The system as in claim 1 in which said points of support comprise wheels turning on axles.
Claim 4
Dependent Claim
23 words
The system as in claim 2 including four wheels and four lift cylinders, and four valves spaced at 90 degrees around said chamber.
Claim 5
Dependent Claim
20 words
The system as in claim 1 including means to support said plumb bob out of contact with said valve stems.
Claim 6
Dependent Claim
17 words
The system as in claim 4 including means to lift said plumb bob above said valve stems.
Claim 7
Dependent Claim
18 words
The system as in claim 4 including means to stabilize said plumb bob to limit its horizontal movement.
Claim 8
Dependent Claim
30 words
The system as in claim 1 including means to lower said plumb bob whereby a larger diameter portion of said plumb bob contacts all valve stems to open all valves.
Claim 9
Dependent Claim
18 words
The system as in claim 1 including means to exhaust the interior of said chamber to the atmosphere.
Claim 10
Dependent Claim
46 words
The system as in claim 1 in which each of said valves is connected to that one of said lift means which is positioned with respect to said frame generally at about the same angle as said each valve is positioned with respect to said frame.
Claim 11
Dependent Claim
15 words
The system as in claim 1 including means to raise and lower said plumb bob.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |