Patent US3891108A successfully refreshed from Google Patents.
US3891108A
Expired / Lapsed
US
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High lift mechanism
Assignee: Individual
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Filing: 1973-02-14
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Granted: 1975-06-24
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Expires: 1993-02-14
Abstract
Abstract A high lift mechanism for trucks comprised generally of a scissors-type of lever mechanism which may be mounted to any standard truck chassis without extending below the channel beams of said chassis. Hydraulic cylinder means, normally laying almost flat in the chassis frame, first pushes against the top end of a pivoted link resulting in vertically directed forces to accomplish the first phase of the lift cycle. Roller means, carried by the head of the hydraulic cylinder piston, move along a bearing plate during the first portion of the lift cycle and when said roller means contacts abutment means at the end of the bearing plate, forces are directed thereagainst to accomplish the final phase of the lift cycle.
Inventors
- 👤 Charles Traficant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:18
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/08; B60; B60P; B60P1/00; B60P1/02; B66F7/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
324 words
A high lift mechanism, for mounting on a truck chassis, to move a cargo body fixed thereto between a retracted, down position and an elevated position comprising, A. a lower frame for fixed engagement with the truck chassis; B. an upper frame to carry the cargo body threatop; C. lever means interconnecting said frames comprised of, 1. a first combination of levers, and 2. a second combination of levers; D. fluid actuated ram means for moving said upper frame between said positions; E. means to drivingly engage the extended end of said ram means to said first combination of levers to elevate said upper frame to a predetermined, intermediate, level, in a first phase operation, when pressurized fluid is delivered to said ram means; F. means to disengage said means to engage from said fiRst combination of levers at said intermediate level and to simultaneously engage same with said second combination of levers to elevate said upper frame to its maximum elevated position in a second phase of operation; said interconnecting lever means includes a pair of scissors type lift levers interconnecting each of the respective sides of said upper and lower frames and a link means pivotally attached at a first end to said lower frame, intermediate the opposed ends of said scissors levers; said scissors levers and link means comprising said first combination of levers and said scissors levers comprising said second combination of levers; said means to drivingly engage comprises a bearing plate, fixed to and spanning a portion of one corresponding pair of said scissors levers, and a yoke means at the second end of said link means to receive a tip end portion of said ram; said bearing plate being sized and positioned to maintain said tip end portion in said yoke through said first phase of operation during which forces are directed upwardly by the movement of the ram and the resulting pivotal movement of said link means.
Claim 2
Dependent Claim
324 words
A high lift mechanism, for mounting on a truck chassis, to move a cargo body fixed thereto between a retracted, down position and an elevated position comprising, A. a lower frame for fixed engagement with the truck chassis; B. an upper frame to carry the cargo body threatop; C. lever means interconnecting said frames comprised of, 1. a first combination of levers, and 2. a second combination of levers; D. fluid actuated ram means for moving said upper frame between said positions; E. means to drivingly engage the extended end of said ram means to said first combination of levers to elevate said upper frame to a predetermined, intermediate, level, in a first phase operation, when pressurized fluid is delivered to said ram means; F. means to disengage said means to engage from said fiRst combination of levers at said intermediate level and to simultaneously engage same with said second combination of levers to elevate said upper frame to its maximum elevated position in a second phase of operation; said interconnecting lever means includes a pair of scissors type lift levers interconnecting each of the respective sides of said upper and lower frames and a link means pivotally attached at a first end to said lower frame, intermediate the opposed ends of said scissors levers; said scissors levers and link means comprising said first combination of levers and said scissors levers comprising said second combination of levers; said means to drivingly engage comprises a bearing plate, fixed to and spanning a portion of one corresponding pair of said scissors levers, and a yoke means at the second end of said link means to receive a tip end portion of said ram; said bearing plate being sized and positioned to maintain said tip end portion in said yoke through said first phase of operation during which forces are directed upwardly by the movement of the ram and the resulting pivotal movement of said link means.
Claim 3
Dependent Claim
260 words
a second combination of levers; D. fluid actuated ram means for moving said upper frame between said positions; E. means to drivingly engage the extended end of said ram means to said first combination of levers to elevate said upper frame to a predetermined, intermediate, level, in a first phase operation, when pressurized fluid is delivered to said ram means; F. means to disengage said means to engage from said fiRst combination of levers at said intermediate level and to simultaneously engage same with said second combination of levers to elevate said upper frame to its maximum elevated position in a second phase of operation; said interconnecting lever means includes a pair of scissors type lift levers interconnecting each of the respective sides of said upper and lower frames and a link means pivotally attached at a first end to said lower frame, intermediate the opposed ends of said scissors levers; said scissors levers and link means comprising said first combination of levers and said scissors levers comprising said second combination of levers; said means to drivingly engage comprises a bearing plate, fixed to and spanning a portion of one corresponding pair of said scissors levers, and a yoke means at the second end of said link means to receive a tip end portion of said ram; said bearing plate being sized and positioned to maintain said tip end portion in said yoke through said first phase of operation during which forces are directed upwardly by the movement of the ram and the resulting pivotal movement of said link means.
Claim 4
Dependent Claim
260 words
a second combination of levers; D. fluid actuated ram means for moving said upper frame between said positions; E. means to drivingly engage the extended end of said ram means to said first combination of levers to elevate said upper frame to a predetermined, intermediate, level, in a first phase operation, when pressurized fluid is delivered to said ram means; F. means to disengage said means to engage from said fiRst combination of levers at said intermediate level and to simultaneously engage same with said second combination of levers to elevate said upper frame to its maximum elevated position in a second phase of operation; said interconnecting lever means includes a pair of scissors type lift levers interconnecting each of the respective sides of said upper and lower frames and a link means pivotally attached at a first end to said lower frame, intermediate the opposed ends of said scissors levers; said scissors levers and link means comprising said first combination of levers and said scissors levers comprising said second combination of levers; said means to drivingly engage comprises a bearing plate, fixed to and spanning a portion of one corresponding pair of said scissors levers, and a yoke means at the second end of said link means to receive a tip end portion of said ram; said bearing plate being sized and positioned to maintain said tip end portion in said yoke through said first phase of operation during which forces are directed upwardly by the movement of the ram and the resulting pivotal movement of said link means.
Claim 5
Dependent Claim
91 words
A high lift mechanism as defined in claim 1 wherein said means to disengage comprises abutment means fixed to and extending between said bearing plate and said corresponding pair of scissors levers, said abutment means being arranged and positioned to contact the tip end portion of said ram at the end of said first phase, resulting in disengagement of said tip end from said yoke, continued operation of said ram resulting in said second phase of operation during which lifting forces are directed to said upper frame by the scissors levers.
Claim 6
Dependent Claim
27 words
A high lift mechanism as defined in claim 1 including roller means, carried by said tip end portion, in bearing engagement between said yoke and bearing plate.
Claim 7
Dependent Claim
23 words
A high lift mechanism as defined in claim 1 including a spring loaded piston means connecting between said lower frame and link means.
Claim 8
Dependent Claim
57 words
A high lift mechanism as defined in claim 1 wherein the side rails of said upper and lower frames are formed of channel beams, each of said scissors levers having a first end pivotally attached to one of said beams and a second end provided with a roller which tracks in the channel of an opposed beam.
Claim 9
Dependent Claim
35 words
A high lift mechanism as defined in claim 1 wherein all of said elements are positioned entirely within the confines of said lower and upper frames when said upper frames is in its down position.
Claim 10
Dependent Claim
24 words
A high lift mechanism as defined in claim 1 wherein said fluid actuated ram means comprises at least one hydraulic cylinder and piston assembly.
Claim 11
Dependent Claim
24 words
A high lift mechanism as defined in claim 1 wherein said fluid actuated ram means comprises at least two hydraulic cylinder and piston assemblies.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |