US4053073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level lifting system for truck bodies or containers
Assignee: OFFICINE FRANCHIN DI GIULIANO FRANCHIN AND C S SA
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Filing: 1975-12-15
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Granted: 1977-10-11
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Expires: 1995-12-15
Abstract
Abstract To avoid instability, tilting or overturning of containerized freight or truck bodies during raising and lowering thereof, four double-acting lift cylinders are disposed at the four corners of a rectangular array, the cylinders comprising two pairs of cylinders, each pair of which comprises one cylinder which is connected in series to the respective cylinder at the diagonally opposite corner of the rectangular array of cylinders.
Inventors
- 👤 Franco Franchin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:15
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/12; B65D90/14; B60; B60P; B60P1/00; B60P1/64; B60P1/6418; B60P1/6427
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
178 words
A lifting system for truck bodies and the like comprising four double-acting cylinder-piston units arranged in a rectangular array, each cylinder-piston unit in said array having an upper and a lower chamber on opposite sides of the piston of such unit, conduit means serially connecting the lower chambers of one pair of units in the array with the upper chambers of the pair of units which are diagonally opposite in said array, conduit means connected with the upper chambers of said one pair of units and feeding pressurized fluid to said upper chambers in parallel, return conduit means connected with the lower chambers of the second-named pair of units in said rectangular array and returning fluid from said lower chambers in parallel to a source of fluid, a fluid pumping means connected with said source of fluid, and a fluid distributor connected with the pumping means and with the second-named and return conduit means, said double-acting cylinder-piston units having extensible and retractable members which are ground-engageable, and said cylinder-piston units being adapted for attachment to a container body.
Claim 2
Dependent Claim
178 words
A lifting system for truck bodies and the like comprising four double-acting cylinder-piston units arranged in a rectangular array, each cylinder-piston unit in said array having an upper and a lower chamber on opposite sides of the piston of such unit, conduit means serially connecting the lower chambers of one pair of units in the array with the upper chambers of the pair of units which are diagonally opposite in said array, conduit means connected with the upper chambers of said one pair of units and feeding pressurized fluid to said upper chambers in parallel, return conduit means connected with the lower chambers of the second-named pair of units in said rectangular array and returning fluid from said lower chambers in parallel to a source of fluid, a fluid pumping means connected with said source of fluid, and a fluid distributor connected with the pumping means and with the second-named and return conduit means, said double-acting cylinder-piston units having extensible and retractable members which are ground-engageable, and said cylinder-piston units being adapted for attachment to a container body.
Claim 3
Dependent Claim
90 words
A lifting system for truck bodies and the like as defined in claim 1, and means for equalizing fluid pressures in the lower chambers of said one pair of units relative to the fluid pressures in the upper chambers of said diagonally opposite units, and said conduit means connected with said upper chambers of said one pair of units comprising a single conduit common to said upper chambers and communicating directly therewith, said return conduit means also comprising a single conduit common to said lower chambers and communicating directly therewith.
Claim 4
Dependent Claim
64 words
A lifting system for truck bodies and the like as defined in claim 1, and a pair of maximum pressure relief valves connected with the second-named conduit means in parallel and connected with the lower chambers of said one pair of units and also connected with the upper chambers of the pair of units which are diagonally opposite said relief valves in said array.
Claim 5
Dependent Claim
46 words
A lifting system for truck bodies and the like as defined in claim 1, and said four cylinder-piston units mounted on a truck chassis and connected with a truck body resting on the chassis and operable to raise and lower the body relative to the chassis.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |