Patent US3874477A successfully refreshed from Google Patents.
US3874477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for shoring up the base frame of lifts hoists and the like
Assignee: Individual
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Filing: 1973-03-21
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Granted: 1975-04-01
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Expires: 1993-03-21
Abstract
Abstract A method and apparatus for shoring up the base frame of hoists and similar devices which can be towed about a site and which are provided with a horizontal platform arranged for vertical displacement along a mast attached to a wheeled base frame structure. The means provided for raising and lowering the horizontal platform the mast is also adapted to raise the base frame structure above the level of the hoist supporting surface so that props or similar support members can be inserted between the base frame and the supporting surface. Further activation of the horizontal platform drive means then lowers the base frame onto the props.
Inventors
- 👤 Ture E Hedstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:04
CPC Classifications
B; B66; B66B; B66B9/00; B66B9/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A method of shoring up the base frame of lifts, hoists and the like on a supporting surface, said base frame having guide means, a cage mounted on said guide mEans for up and down movement and drive means for moving the cage, characterized by activating the drive means to lift the cage from the base frame, connecting support means to said cage, lowering said cage with said support means into engagement with the supporting surface to life the base frame, introducing props between the base frame and the supporting surface, raising the cage and lowering the base frame onto the props.
Claim 2
Independent Claim
102 words
A method of shoring up the base frame of lifts, hoists and the like on a supporting surface, said base frame having guide means, a cage mounted on said guide mEans for up and down movement and drive means for moving the cage, characterized by activating the drive means to lift the cage from the base frame, connecting support means to said cage, lowering said cage with said support means into engagement with the supporting surface to life the base frame, introducing props between the base frame and the supporting surface, raising the cage and lowering the base frame onto the props.
Claim 3
Dependent Claim
136 words
An arrangement for shoring up the base frame of lifts, hoists and the like on a supporting surface according to the method described herein, said lift, hoist or the like comprising: guide means carried by said base frame, a cage mounted on said guide means for up and down movement and having support means for engagement with the supporting surface and drive means for raising and lowering the cage along said guide means, said drive means being effective to raise said base frame a predetermined distance above said supporting surface as the cage is lowered with said support means into engagement with the supporting surface to permit props to be inserted between the base frame and the supporting surface and to lower the base frame onto the supporting surface by the raising operation of the cage.
Claim 4
Dependent Claim
136 words
An arrangement for shoring up the base frame of lifts, hoists and the like on a supporting surface according to the method described herein, said lift, hoist or the like comprising: guide means carried by said base frame, a cage mounted on said guide means for up and down movement and having support means for engagement with the supporting surface and drive means for raising and lowering the cage along said guide means, said drive means being effective to raise said base frame a predetermined distance above said supporting surface as the cage is lowered with said support means into engagement with the supporting surface to permit props to be inserted between the base frame and the supporting surface and to lower the base frame onto the supporting surface by the raising operation of the cage.
Claim 5
Dependent Claim
45 words
An arrangement according to claim 2, in which the cage is provided with legs for supporting the cage on the supporting surface when it has been lowered to a predetermined distance above said surface and being effective to produce the raising operation of the frame.
Claim 6
Dependent Claim
22 words
An arrangement according to claim 2, in which the support legs are adjustable vertically to compensate for irregularities in the supporting surface.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |