US3623707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laboratory jack
Assignee: Chemical Rubber Co
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Filing: 1969-11-05
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Granted: 1971-11-30
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Expires: 1989-11-05
Abstract
Abstract A platform jack apparatus of the type using scissors-type mechanisms. The platform or load support is carried on the scissors mechanisms and means are provided for selectively actuating the scissors mechanisms to raise and lower the platform. The actuating means comprises a rotatably driven screw rod carrying nut members thereon. Connecting bars or links extend from the nut members to the lower ends of the scissors mechanisms so that rotation of the screw rod produces vertical movement of the platform. The relationship between the screw rod, the connecting links, and the scissors mechanisms is such that for any one load, the force input required is substantially constant throughout the platform''s range of movement.
Inventors
- 👤 Edward M Klopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:02
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/06; B66F7/065; B66F7/0666; B66F7/0608
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A load-lifting jack comprising a base, a load supporting platform; means supporting said platform on said base for movement toward and away from said base; said supporting means including at least one pair of first and second diagonally crossed links with one end of each of said links operatively supported on said base and the other end of each of said links operatively connected to said platform whereby movement of the base-supported ends of said links toward each other causes movement of said platform away from said base; a pair of toggle links defining a toggle linkage means supported on said base with one end of one of said toggle links being connected to one of said crossed links and one end of the other of said toggle links being connected to the other of said crossed links; means interconnecting the other ends of said toggle links; actuating means connected to said connected ends of said toggle links for moving said toggle links toward and away from each other; said toggle linkage means being so arranged that said toggle links move toward a collapsed condition when said platfOrm moves away from said base.
Claim 2
Dependent Claim
193 words
A load-lifting jack comprising a base, a load supporting platform; means supporting said platform on said base for movement toward and away from said base; said supporting means including at least one pair of first and second diagonally crossed links with one end of each of said links operatively supported on said base and the other end of each of said links operatively connected to said platform whereby movement of the base-supported ends of said links toward each other causes movement of said platform away from said base; a pair of toggle links defining a toggle linkage means supported on said base with one end of one of said toggle links being connected to one of said crossed links and one end of the other of said toggle links being connected to the other of said crossed links; means interconnecting the other ends of said toggle links; actuating means connected to said connected ends of said toggle links for moving said toggle links toward and away from each other; said toggle linkage means being so arranged that said toggle links move toward a collapsed condition when said platfOrm moves away from said base.
Claim 3
Dependent Claim
22 words
The jack of claim 1 wherein said toggle links lie in a plane generally perpendicular to the plane of said crossed links.
Claim 4
Dependent Claim
30 words
The jack of claim 2 wherein said actuating means comprises a rotatable drive screw, and said interconnecting means includes a drive nut carried on the drive screw and movable therealong.
Claim 5
Dependent Claim
16 words
The jack of claim 3 and further including reversible motor means for rotating said drive screw.
Claim 6
Dependent Claim
97 words
The jack of claim 1 wherein said supporting means for said platform further includes a second pair of first and second diagonally crossed links operatively connected to said base and said platform, and a second pair of toggle links defining a second toggle linkage means operatively connected to said second pair of crossed links for moving the ends of said crossed links toward and away from each other; said second toggle linkage means being arranged such that the ends of said second pair of crossed links move toward each other as said toggle linkage means is collapsed.
References Cited (Backward Citations)
US2661927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |