Patent US2032619A successfully refreshed from Google Patents.
Patent US3856319A successfully refreshed from Google Patents.
US3856319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting and lowering device for trailers
Assignee: Individual
•
Filing: 1973-09-26
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Granted: 1974-12-24
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Expires: 1993-09-26
Abstract
Abstract A power actuated bell crank construction built into a spring means and supporting axle for a trailer, making it possible to lower the trailer bed for ease of loading and unloading and then raise it to the transporting position.
Inventors
- 👤 C Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:18
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/06; B62D53/061; B62D53/062; B60; B60G; B60G17/00; B60G17/02; B60G17/027; B60G17/0275
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
300 words
A trailer having a front and rear end with side rails forming a bed adapted for travel over the road and having a front hitch and at least two wheels disposed toward the rear of the bed to support the load carrying bed comprising a pair of elongated leaf spring means connected between the wheels and bed, one each of said spring means being disposed to extend longitudinally along each of the opposite sides of the trailer respectively and being pivotally connected to the trailer at the front end and connected to the trailer by means of an articulating link at its rear end, a main axle rotatably carried in bearings fixed to said spring means, crank arms at the ends of the main axle, stub shafts at the ends of said crank arms upon which said wheels are mounted, a lever fixed to one end of said axle to rotate the axle in said bearings, said lever being of a length to extend from said axle to the underside of one of said side rails whereby said crank arms are rotated with the axle supported on the bearings on said springs to turn on the stub shafts in the wheels to raise and lower the axle and the associated spring means and bed relative to the road, reciprocably driven power means connected to said lever with a link pivotally connected thereto, and power drive means mounted on the bed over the articulating link that connects the spring to the bed and said construction being operative to lower the bed relative to the ground when said driven power means is extended and to lift said bed for travel when said power means is retracted, to relieve the power means of undue load stresses when the trailer travels over the road.
Claim 2
Dependent Claim
300 words
A trailer having a front and rear end with side rails forming a bed adapted for travel over the road and having a front hitch and at least two wheels disposed toward the rear of the bed to support the load carrying bed comprising a pair of elongated leaf spring means connected between the wheels and bed, one each of said spring means being disposed to extend longitudinally along each of the opposite sides of the trailer respectively and being pivotally connected to the trailer at the front end and connected to the trailer by means of an articulating link at its rear end, a main axle rotatably carried in bearings fixed to said spring means, crank arms at the ends of the main axle, stub shafts at the ends of said crank arms upon which said wheels are mounted, a lever fixed to one end of said axle to rotate the axle in said bearings, said lever being of a length to extend from said axle to the underside of one of said side rails whereby said crank arms are rotated with the axle supported on the bearings on said springs to turn on the stub shafts in the wheels to raise and lower the axle and the associated spring means and bed relative to the road, reciprocably driven power means connected to said lever with a link pivotally connected thereto, and power drive means mounted on the bed over the articulating link that connects the spring to the bed and said construction being operative to lower the bed relative to the ground when said driven power means is extended and to lift said bed for travel when said power means is retracted, to relieve the power means of undue load stresses when the trailer travels over the road.
Claim 3
Dependent Claim
94 words
A structure as in claim 1, wherein said power drive means constitutes an elongated hydraulic motor and the reciprocably driven power means is a reciprocating piston, said motor being carried on the bed of the trailer, said spring means being positioned on the under side of said bed, and said link pivotally connected to the driven power means is a pivotally connected link mounted between said piston and said lever whereby said axle may be actuated by said motor to drive the crank arms by moving the lever under the bed of the trailer.
Claim 4
Dependent Claim
288 words
A trailer adapted to be connected at its front end to a hitch on a towing vehicle, the trailer having a load carrying frame supported on two wheels located toward the back end of the underside of the frame comprising leaf spring means extending longitudinally in a front to back direction on each side of the frame at the wheel support station, each spring being pivoted to the frame at its front end and connected to the frame with an articulating link at its back end, an oscillating main axle for said wheels, beariNg means for rotatably supporting the main axle on said leaf spring means, generally horizontally extending bell crank arms fixed to each end of the main axle, said bell crank arms having stub shaft means at their respective free ends for engaging said wheels to support the trailer, a lever integral with said main axle extending upwardly to the underside of the frame to complete said bell crank means, and a hydraulic motor having a reciprocating piston and rod means to control the movement of said lever to oscillate the main axle in its bearings on the springs, said motor being fixed to said frame over the back end of one of the articulating link connections of a spring to the frame, a link having a pivoted connection between the end of the piston rod and the upper end of said upwardly extending bell crank lever, said piston being reciprocable whereby to rotate said crank arms relative to the wheels to raise and lower said frame when desired with respect to the road, and said piston being retracted fully to raise the frame for road travel to free the piston rod of any travel load.
Claim 5
Dependent Claim
288 words
A trailer adapted to be connected at its front end to a hitch on a towing vehicle, the trailer having a load carrying frame supported on two wheels located toward the back end of the underside of the frame comprising leaf spring means extending longitudinally in a front to back direction on each side of the frame at the wheel support station, each spring being pivoted to the frame at its front end and connected to the frame with an articulating link at its back end, an oscillating main axle for said wheels, beariNg means for rotatably supporting the main axle on said leaf spring means, generally horizontally extending bell crank arms fixed to each end of the main axle, said bell crank arms having stub shaft means at their respective free ends for engaging said wheels to support the trailer, a lever integral with said main axle extending upwardly to the underside of the frame to complete said bell crank means, and a hydraulic motor having a reciprocating piston and rod means to control the movement of said lever to oscillate the main axle in its bearings on the springs, said motor being fixed to said frame over the back end of one of the articulating link connections of a spring to the frame, a link having a pivoted connection between the end of the piston rod and the upper end of said upwardly extending bell crank lever, said piston being reciprocable whereby to rotate said crank arms relative to the wheels to raise and lower said frame when desired with respect to the road, and said piston being retracted fully to raise the frame for road travel to free the piston rod of any travel load.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |