Patent US3593858A successfully refreshed from Google Patents.
US3593858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy duty lift
Assignee: Individual
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Filing: 1968-02-23
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Granted: 1971-07-20
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Expires: 1988-02-23
Abstract
Abstract A lift device for use with farm tractors and similar mechanisms is described. Preferably the lift is used with and attached to the rear of farm tractors equipped both with conventional lifting arms and a conventional remote controlled double-acting hydraulic cylinder. The lift is capable of raising heavy loads to high elevations, is light weight, and can be installed and used by one operator. In addition the lift can readily be fabricated from low cost, readily available component parts.
Inventors
- 👤 Shelton Ruffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:28
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/36; B66C23/44; A; A01; A01D; A01D87/00; B60; B60D; B60D1/00; B60D1/24; B60D1/42; B60D1/46; B60D1/465; B60P; B60P1/00; B60P1/54; B60P1/5404; B60P1/5423; B60P1/5428
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A portable lift for farm tractors or the like which comprises: a. an elongate deflected pole defining an obtuse angle and having a longer segment and a shorter segment; b. a gantry bar affixed to said shorter segment and extending above an imaginary line projected rearwardly from said longer segment; c. means for pivotally attaching and supporting the pole in proximity to the rearward terminus of said shorter segment to permit arcuate motion of the pole in a vertical plane; and d. means for pivotally connecting the upper end of the gantry bar to a reciprocative driving member having a relatively short linear stroke such that short rearward motion of the driving member will cause exaggerated vertical arcuate motion of the forward end of said longer segment; the forward end of the longer segment of said pole being provided with means for detachably attaching a load at various distances from the opposite end of the pole.
Claim 2
Dependent Claim
156 words
A portable lift for farm tractors or the like which comprises: a. an elongate deflected pole defining an obtuse angle and having a longer segment and a shorter segment; b. a gantry bar affixed to said shorter segment and extending above an imaginary line projected rearwardly from said longer segment; c. means for pivotally attaching and supporting the pole in proximity to the rearward terminus of said shorter segment to permit arcuate motion of the pole in a vertical plane; and d. means for pivotally connecting the upper end of the gantry bar to a reciprocative driving member having a relatively short linear stroke such that short rearward motion of the driving member will cause exaggerated vertical arcuate motion of the forward end of said longer segment; the forward end of the longer segment of said pole being provided with means for detachably attaching a load at various distances from the opposite end of the pole.
Claim 3
Dependent Claim
19 words
The device of claim 1 further characterized in that the means of (c) comprise a lateral two-point hitch assembly.
Claim 4
Dependent Claim
45 words
The device of claim 1 further characterized in that said obtusE angle is in the range of from about 115* to about 155* and in that said gantry bar is substantially perpendicular to the imaginary line projected rearwardly from the longer segment of said pole.
Claim 5
Dependent Claim
36 words
The device of claim 1 further characterized in that an elongate reinforcing member extends between approximately the upper end of said gantry bar and approximately the upper forward end of the longer segment of said pole.
Claim 6
Dependent Claim
67 words
The device of claim 1 further characterized in that the means of (c) comprise a transverse support member carrying a pair of pivotal hitch assemblies adapted to operatively engage the lifting arms of a tractor and in that an elongate bracing member extends between approximately each respective outer end of said transverse support member and a locus intermediate the ends of the longer segment of said pole.
Claim 7
Dependent Claim
70 words
The device of claim 1 further characterized in that the means of (c) comprise a transverse support member carrying a pair of pivotal hitch assemblies adapted to operatively engage the lifting arms of a tractor and in that said gantry bar is affixed to said pole intermediate the ends of the shorter segment thereof and is positioned and adapted to be actuated by a hydraulic cylinder associated with the tractor.
Claim 8
Dependent Claim
202 words
The device of claim 1 further characterized in that said obtuse angle is in the range of from about 115* to about 155*; in that said gantry bar is substantially perpendicular to the imaginary line projected rearwardly from the longer segment of said pole; in that an elongate reinforcing member extends between approximately the upper end of said gantry bar and approximately the upper forward end of the longer segment of said pole; in that the means of (c) comprise a transverse support member carrying a pair of pivotal hitch assemblies adapted to operatively engage the lifting arms of a tractor; in that an elongate bracing member extends between approximately each respective outer end of said transverse support member and a locus intermediate the ends of the longer segment of said pole; in that said gantry bar is affixed to said pole intermediate the ends of the shorter segment thereof and is positioned and adapted to be actuated by a double acting hydraulic cylinder associated with the tractor; and in that the lower forward end of the longer segment of said pole is provided with said means for detachably attaching a load at various distances from the opposite end of the pole.
Claim 9
Dependent Claim
67 words
The device of claim 1 further characterized in that said obtuse angle is in the range of from about 115* to about 155*; in that said gantry bar is substantially perpendicular to the imaginary line projected rearwardly from the longer segment of said pole; and in that the length ratio, said longer segment: said shorter segment, is in the range of from about 8:1 to about 2:1.
Claim 10
Dependent Claim
223 words
A portable lift for farm tractors or the like which comprises: a. an elongate deflected pole defining an obtuse angle in the range of from about 115* to about 115* and having a longer segment and a shorter segment; b. a gantry bar affixed to said shorter segment and extending above and being substantially perpendicular to an imaginary line projected rearwardly from said longer segment; c. means for pivotally attaching and supporting the pole in proximity to the rearward terminus of shorter segment to permit arcuate motion of the pole in a vertical plane, said means comprising a transverse support member carrying a pair of pivotal hitch assemblies adapted to operatively engage the lifting arms of a tractor; d. means for pivotally connecting the upper end of the gantry bar to a reciprocative driving member having a relatively short linear stroke such that short rearward motion of the driving member will cause exaggerated vertical arcuate motion of the forward end of said longer segment; e. an elongate reinforcing member extending between approximately the upper end of said gantry bar and approximately the upper forward end of the longer segment of said pole; and f. an elongate bracing member extending between approximately each respective outer end of said transverse support member and a locus intermediate the ends of the longer segment of said pole.
Claim 11
Dependent Claim
223 words
A portable lift for farm tractors or the like which comprises: a. an elongate deflected pole defining an obtuse angle in the range of from about 115* to about 115* and having a longer segment and a shorter segment; b. a gantry bar affixed to said shorter segment and extending above and being substantially perpendicular to an imaginary line projected rearwardly from said longer segment; c. means for pivotally attaching and supporting the pole in proximity to the rearward terminus of shorter segment to permit arcuate motion of the pole in a vertical plane, said means comprising a transverse support member carrying a pair of pivotal hitch assemblies adapted to operatively engage the lifting arms of a tractor; d. means for pivotally connecting the upper end of the gantry bar to a reciprocative driving member having a relatively short linear stroke such that short rearward motion of the driving member will cause exaggerated vertical arcuate motion of the forward end of said longer segment; e. an elongate reinforcing member extending between approximately the upper end of said gantry bar and approximately the upper forward end of the longer segment of said pole; and f. an elongate bracing member extending between approximately each respective outer end of said transverse support member and a locus intermediate the ends of the longer segment of said pole.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |