US3768591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double parallelogram linkage lift
Assignee: Individual
•
Filing: 1971-12-09
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Granted: 1973-10-30
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Expires: 1991-12-09
Abstract
Abstract A lift including a base for support from a support surface, a generally horizontal load platform and a pair of parallel arms pivotally connected at one pair of corresponding ends to said base and at the other pair of corresponding ends to the load platform. Motor structure is connected between the base and the parallel arms for swinging the latter relative to the base and thus between arms and the platform for swinging the latter relative to the arms in a manner maintaining the platform generally horizontally disposed throughout swinging movement of the arms relative to the base and the platform relative to the arms.
Inventors
- 👤 J Stucky
- 👤 R Stucky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
B; B66; B66F; B66F11/00; B66F11/04; B66F11/044
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
231 words
In combination, a lift including a base for positioning on a support structure, a generally horizontal elongated load platform including first and second end portions and first and second pairs of horizontally spaced apart opposite side parallelogram arm assemblies extending along opposite side portions of said platform and including corresponding first and second end portions and upper and lower parallel arm members and supporting said load platform from said base, the first pair of parallelogram arm assemblies being pivotally connected at said first end portions thereof to opposite side portions of said base and at their second end portions to opposite side portions of the corresponding end of said load platform, the second pair of parallelogram arm assemblies extending longitudinally along opposite side portions of said platform and being secured to the latter, the second end portions of said first and second pairs of arm assemblies being pivotally secured together, first extendible motor means connected between said base and said first end portions of said first arm assemblies for swinging the latter relative to the former and second extendible motor means connected between said second end portions of said first arm assemblies and said second arm assemblies for swinging the latter, and said load platForm, relative to the first arm assemblies in a manner maintaining the platform generally horizontal throughout swinging movement of said first arm assemblies relative to the base.
Claim 2
Dependent Claim
231 words
In combination, a lift including a base for positioning on a support structure, a generally horizontal elongated load platform including first and second end portions and first and second pairs of horizontally spaced apart opposite side parallelogram arm assemblies extending along opposite side portions of said platform and including corresponding first and second end portions and upper and lower parallel arm members and supporting said load platform from said base, the first pair of parallelogram arm assemblies being pivotally connected at said first end portions thereof to opposite side portions of said base and at their second end portions to opposite side portions of the corresponding end of said load platform, the second pair of parallelogram arm assemblies extending longitudinally along opposite side portions of said platform and being secured to the latter, the second end portions of said first and second pairs of arm assemblies being pivotally secured together, first extendible motor means connected between said base and said first end portions of said first arm assemblies for swinging the latter relative to the former and second extendible motor means connected between said second end portions of said first arm assemblies and said second arm assemblies for swinging the latter, and said load platForm, relative to the first arm assemblies in a manner maintaining the platform generally horizontal throughout swinging movement of said first arm assemblies relative to the base.
Claim 3
Dependent Claim
46 words
The combination of claim 1 wherein said first and second motor means includes first and second fluid motors having fluid inlets and outlets connected in series within a fluid pressure flow path extending from a source of fluid under pressure and returning back to said source.
Claim 4
Dependent Claim
96 words
The combination of claim 2 wherein said first and second fluid motors, each includes a fluid inlet and a fluid outlet port disposed on opposite sides of the associated piston, said fluid flow circuit including a pressure line communicating the outlet port of said first cylinder with the inlet port of said second cylinder, a flow reversing control valve having pairs of inversely operable pressure outlet and fluid return ports, and second and third pressure lines communicating the inlet port of said first cylinder and the outlet port of said second cylinder with said valve ports.
Claim 5
Dependent Claim
24 words
The combination of claim 1 wherein said first pair of parallelogram arm assemblies are inclined downwardly when said platform is in a lowered position.
References Cited (Backward Citations)
US3283850A
Cited
US3462103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |