US4174094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recreational vehicle leveling and support system
Assignee: Individual
•
Filing: 1978-02-03
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Granted: 1979-11-13
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Expires: 1998-02-03
Abstract
Abstract A leveling and support system for recreational vehicles operates on a plurality of telescoping air cylinders. Leveling is accomplished through a separate valve in the line for each cylinder, each valve being mounted adjacent the others, and adjacent an electrical switch which operates a DC motor in either a forward or a reverse direction. The motor actuates a rotary air compressor in a forward or reverse direction for changing the air pressure from positive to negative while operating each of the valves to each cylinder line.
Inventors
- 👤 Joseph M. Valdespino
- 👤 Ronald A. Brandl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:28
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/10; B66F7/16; B66F7/20; B60; B60S; B60S9/00; B60S9/02; B60S9/10; B60S9/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
232 words
A recreational vehicle leveling system comprising in combination: a plurality of fluid cylinders each having at least two telescoping rods, the first rod being mounted in the cylinder casing, and the second rod being mounted in the casing of the first rod to telescope the cylinders from the main casing; an electrical power source; electrical motor driven compressor connected to said electrical power source; valve means operatively connected between said compressor and each said fluid cylinder, said valve means having a manifold connected to said compressor and having a plurality of air lines extending therefrom, each air line having an individual valve therein operated by a valve handle and each air line being connected to one of said plurality of fluid cylinders; means to reverse the pressure applied to said valve means by said compressor from a positive to a negative pressure, whereby said slidable cylinders can be driven in two directions by the air pressure applied thereto and said means to reverse the pressure applied to said valve means, and said valve means operating handles being located in a panel adjacent each other, whereby each said cylinder can be operated in either direction from a central point; and means for locking each said air cylinder in position following the leveling of said recreational vehicle said means for locking each said cylinder having a pair of locking clamps located on each cylinder.
Claim 2
Dependent Claim
232 words
A recreational vehicle leveling system comprising in combination: a plurality of fluid cylinders each having at least two telescoping rods, the first rod being mounted in the cylinder casing, and the second rod being mounted in the casing of the first rod to telescope the cylinders from the main casing; an electrical power source; electrical motor driven compressor connected to said electrical power source; valve means operatively connected between said compressor and each said fluid cylinder, said valve means having a manifold connected to said compressor and having a plurality of air lines extending therefrom, each air line having an individual valve therein operated by a valve handle and each air line being connected to one of said plurality of fluid cylinders; means to reverse the pressure applied to said valve means by said compressor from a positive to a negative pressure, whereby said slidable cylinders can be driven in two directions by the air pressure applied thereto and said means to reverse the pressure applied to said valve means, and said valve means operating handles being located in a panel adjacent each other, whereby each said cylinder can be operated in either direction from a central point; and means for locking each said air cylinder in position following the leveling of said recreational vehicle said means for locking each said cylinder having a pair of locking clamps located on each cylinder.
Claim 3
Dependent Claim
25 words
The apparatus in accordance with claim 1, in which said electric motor driven compressor is a reversible rotary air compressor, driven by a DC motor.
Claim 4
Dependent Claim
57 words
The apparatus in accordance with claim 2, in which said means to reverse the pressure applied to said valve means includes an electrical switch for reversing the electric motor to reverse the direction of rotation of the motor and thereby reverse the compressor to apply either positive or negative pressure by the operation of the electrical switch.
Claim 5
Dependent Claim
26 words
The apparatus in accordance with claim 3, in which a master valve is connected between said manifold and said compressor for locking all the cylinders simultaneously.
Claim 6
Dependent Claim
56 words
The apparatus in accordance with claim 4, in which said second extendable cylinder in said telescoping cylinders has one solid end for applying air pressure thereagainst, and has a threaded extension member extending into the other end for extending the end of the cylinder, whereby additional adjustments may be made to the length of the cylinders.
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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |