Patent US1021325A successfully refreshed from Google Patents.
Patent US4711464A successfully refreshed from Google Patents.
US4711464A
Expired / Lapsed
US
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Wheel lift
Assignee: Individual
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Filing: 1986-11-07
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Granted: 1987-12-08
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Expires: 2006-11-07
Abstract
Abstract A wheel lift device for use on an auxiliary wheel and axle assembly on vehicles to increase the load carrying capacity and stability comprises a retractable wheel assembly adjustably positioned by a piston and cylinder configuration for engagement with the ground.
Inventors
- 👤 Michael Bilas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:51
CPC Classifications
B; B62; B62D; B62D61/00; B62D61/12; B60; B60S; B60S9/00; B60S9/14; B60S9/16; B60S9/20; B60G; B60G2204/00; B60G2204/40; B60G2204/47; B60G2300/00; B60G2300/40; B60G2300/402
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
An auxiliary wheel lift for use on a vehicle to provide adjustable additional load capacity comprising a housing secured to said vehicle, a vertically movable head plate within said housing and a attached lift rod extending therefrom, a partition movably positioned within said housing, an air spring positioned on one side of said head plate between said head plate and said partition, means for vertically moving said partition within said housing limiting the travel of the attached lift rod, an adjustable housing insert having a guide bore centrally located on its vertical axis registerably receiving said lift rod, a coil spring positioned on the opposite side of said head plate between said head plate and said housing insert, a wheel lift and axle assembly secured to the free end of said lift rod, means for adjustably positioning said housing insert axially in said housing, and means to activate said air spring comprising a compressed air source, supply lines and a valve in said supply lines.
Claim 2
Dependent Claim
165 words
An auxiliary wheel lift for use on a vehicle to provide adjustable additional load capacity comprising a housing secured to said vehicle, a vertically movable head plate within said housing and a attached lift rod extending therefrom, a partition movably positioned within said housing, an air spring positioned on one side of said head plate between said head plate and said partition, means for vertically moving said partition within said housing limiting the travel of the attached lift rod, an adjustable housing insert having a guide bore centrally located on its vertical axis registerably receiving said lift rod, a coil spring positioned on the opposite side of said head plate between said head plate and said housing insert, a wheel lift and axle assembly secured to the free end of said lift rod, means for adjustably positioning said housing insert axially in said housing, and means to activate said air spring comprising a compressed air source, supply lines and a valve in said supply lines.
Claim 3
Dependent Claim
32 words
The auxiliary wheel lift of claim 1 wherein said means for vertically moving said partition comprises a threaded advance bar secured to said paratition extending from said housing and a drive fitting.
Claim 4
Dependent Claim
45 words
An auxiliary wheel lift of claim 1 wherein said means for adjustably positioning said housing insert comprises an integral insert ring having a tool receiving slot opposite said housing insert for rotation of same, said insert ring threadably positioned within said housing opposite said partition.
Claim 5
Dependent Claim
33 words
The auxiliary wheel lift of claim 3 wherein said means for adjustably positioning said insert ring axially in said housing includes a thread on said insert ring and a thread in said housing.
Claim 6
Dependent Claim
28 words
The auxiliary wheel lift of claim 1 wherein said housing includes a side wall, and said head plate includes a flange which slideably engages said housing side wall.
Claim 7
Dependent Claim
61 words
The auxiliary wheel lift of claim 5 wherein said housing insert includes a shoulder on which said coil spring is seated and which includes a wall spaced from said housing side wall to define a gap, said coil spring having a portion thereof located in said gap to be maintained in position by said insert wall and said housing side wall.
Claim 8
Dependent Claim
43 words
The auxiliary wheel lift of claim 6 wherein said head plate flange has an inner surface aligned with said gap, said coil spring being seated against said head plate adjacent an inner surface of said flange for keeping said coil spring properly positioned.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |