Patent US4724875A successfully refreshed from Google Patents.
US4724875A
Expired / Lapsed
US
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Trailer-mounted portable oil change and lubricating system for motor vehicles
Assignee: PORTA-LUBE Inc A CORP OF COLORADO
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Filing: 1986-11-21
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Granted: 1988-02-16
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Expires: 2006-11-21
Abstract
Abstract A vehicle-servicing trailer is attachable to a pulling vehicle for transporation to the intended servicing site, the trailer having a hydraulically controlled lift apparatus, ramps on opposite sides of the trailer for advancement of a vehicle to be serviced onto the trailer, and outriggers are stationed at the four corners of the trailer to cooperate in supporting a vehicle on the trailer. When the vehicle is loaded on the trailer via the ramps, the lift is activated to raise the track members and vehicle to be serviced so that the underside of the vehicle is accessible, and outboard extensions on the track members enable a service man or operator to gain access to the engine compartment and interior of the vehicle. A movable dolly is positioned centrally of the trailer to permit the operator to slide beneath the vehicle and to perform necessary servicing operations, such as, oil changes and lubrication jobs. An oil drain tank is incorporated into the trailer to receive waste oil and the necesary oil and grease lines extend from suitable sources of supply at the rear of the pulling vehicle to facilitate servicing.
Inventors
- 👤 Wendell Baldwin
- 👤 Harley D. Longan
- 👤 Dudley R. Seifert
- 👤 Stanley A. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:38
CPC Classifications
B; B60; B60S; B60S5/00; B60P; B60P3/00; B60P3/14; B66; B66F; B66F7/00; B66F7/06; B66F7/0625; B66F7/0641; B66F7/08; B66F7/28; F; F16; F16N; F16N31/00; Y; Y10; Y10T; Y10T137/00; Y10T137/3802
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
A portable lift apparatus for servicing vehicles having fore and aft pairs of ground-engaging wheels thereon comprising: a trailer having lower wheel members and an upper rigid supporting frame; longitudinally extending, laterally spaced track members on opposite sides of said frame to support the fore and aft pairs of ground-engaging wheels of a vehicle thereon, pivot means pivotally interconnecting said track members and said frame, and hydraulic lift means for selectively, adjustably lifting said track members between a retracted position resting on said frame and a raised position supporting said ground-engaging wheels of the vehicle in spaced relation to said frame; and adjustable locking members interposed between at least one of said track members and said frame to lock said track members in the raised position above said frame established by said hydraulic lift means.
Claim 2
Dependent Claim
135 words
A portable lift apparatus for servicing vehicles having fore and aft pairs of ground-engaging wheels thereon comprising: a trailer having lower wheel members and an upper rigid supporting frame; longitudinally extending, laterally spaced track members on opposite sides of said frame to support the fore and aft pairs of ground-engaging wheels of a vehicle thereon, pivot means pivotally interconnecting said track members and said frame, and hydraulic lift means for selectively, adjustably lifting said track members between a retracted position resting on said frame and a raised position supporting said ground-engaging wheels of the vehicle in spaced relation to said frame; and adjustable locking members interposed between at least one of said track members and said frame to lock said track members in the raised position above said frame established by said hydraulic lift means.
Claim 3
Dependent Claim
29 words
A portable lift apparatus according to claim 1, a raised platform extending between said track members, and a wheeled dolly member supported on said platform for longitudinal movement thereon.
Claim 4
Dependent Claim
29 words
A portable lift apparatus according to claim 2, said raised platform including longitudinally extending tracks, and said dolly including dolly wheels inserted in said guide tracks for movement therealong.
Claim 5
Dependent Claim
38 words
A portable lift apparatus according to claim 1, including an oil storage tank mounted on said frame and a movable drain pan supported on said frame for draining oil from a vehicle being serviced into said oil tank.
Claim 6
Dependent Claim
52 words
A portable lift apparatus according to claim 4, said movable drain pan including a flexible hose extending between said drain pan and said tank, a support arm and swivel support means for releasably receiving said support arm for swiveled movement of said drain pan into a position beneath the vehicle being serviced.
Claim 7
Dependent Claim
21 words
A portable lift apparatus according to claim 4, said ramp members being telescopically received within said channels of said track members.
Claim 8
Dependent Claim
48 words
A portable lift apparatus according to claim 1, said track members each having outboard extension means overlying said pairs of ground-engaging wheels in the retracted position and lifted to the raised position with said track members, said outboard extension means operative to support personnel in servicing said vehicle.
Claim 9
Dependent Claim
48 words
A portable lift apparatus according to claim 1, said track members in the form of longitudinally extending channels, and means including ramp members extendible from said channels to slope downwardly and rearwardly to a ground surface from said channels to facilitate driving a vehicle onto said track members.
Claim 10
Dependent Claim
45 words
A portable lift apparatus according to claim 7, said frame including a storage area covered by said outboard extension means when said track members are in the lowered position and said storage area being uncovered when said track members are lifted to the raised position.
Claim 11
Dependent Claim
45 words
A portable lift apparatus according to claim 1, said hydraulic lift means including hydraulic cylinders pivotally connected to each of said track members, and said pivot means including pivot links pivotally connected to said track members flanking opposite sides of each of said hydraulic cylinders.
Claim 12
Dependent Claim
166 words
A portable lift apparatus for servicing vehicles having fore and aft pairs of ground-engaging wheels thereon comprising: a trailer having ground-engaging wheel members and an upper fixed supporting framework; longitudinally extending, laterally spaced track members on opposite sides of said framework to support said pairs of ground-engaging wheels of a vehicle to be serviced thereon, pivot link means pivotally interconnecting said track members and framework, hydraulic lift means for adjustably lifting said track members between a retracted position resting on said framework and a raised position supporting said vehicle above said framework, and adjustable locking members bers between at least one of said track members and said framework to lock said track members in the raised position above said framework established by said hydraulic lift means; and a raised platform extending between said track members, said raised platform including longitudinally extending tracks, a wheeled dolly supported on said platform for longitudinal movement thereon, said dolly including dolly wheels inserted in said guide tracks for movement therealong.
Claim 13
Dependent Claim
166 words
A portable lift apparatus for servicing vehicles having fore and aft pairs of ground-engaging wheels thereon comprising: a trailer having ground-engaging wheel members and an upper fixed supporting framework; longitudinally extending, laterally spaced track members on opposite sides of said framework to support said pairs of ground-engaging wheels of a vehicle to be serviced thereon, pivot link means pivotally interconnecting said track members and framework, hydraulic lift means for adjustably lifting said track members between a retracted position resting on said framework and a raised position supporting said vehicle above said framework, and adjustable locking members bers between at least one of said track members and said framework to lock said track members in the raised position above said framework established by said hydraulic lift means; and a raised platform extending between said track members, said raised platform including longitudinally extending tracks, a wheeled dolly supported on said platform for longitudinal movement thereon, said dolly including dolly wheels inserted in said guide tracks for movement therealong.
Claim 14
Dependent Claim
62 words
A portable lift apparatus according to claim 11, said track members in the form of longitudinally extending channels, ramp members extendible from said channels to slope downwardly and rearwardly to a ground surface from said channels to facilitate driving a vehicle onto said track members, said ramp members being telescopically received within said channels of said track members and releasably connected thereto.
Claim 15
Dependent Claim
83 words
A portable lift apparatus according to claim 11, including an oil storage tank mounted on said framework and a movable drain pan supported on said framework for draining oil from a vehicle being serviced into said oil tank, said movable drain pan including a flexible hose extending between said drain pan and said tank, and a support arm and swivel support means for releasably receiving said support arm for swiveled movement of said drain pan into a position beneath the vehicle being serviced.
Claim 16
Dependent Claim
45 words
A portable lift apparatus according to claim 11, said framework including a storage area covered by said outboard extension means when said track members are in the lowered position and said storage area being uncovered when said track members are lifted to the raised position.
Claim 17
Dependent Claim
46 words
A portable lift apparatus according to claim 11, said hydraulic lift means including hydraulic cylinders pivotally connected to each of said track members, and said pivot link means including pivot links pivotally connected to said track members flanking opposite sides of each of said hydraulic cylinders.
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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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |