Patent US4456421A successfully refreshed from Google Patents.
US4456421A
Expired / Lapsed
US
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Lifting apparatus
Assignee: STOWALIFT Ltd
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Filing: 1981-09-25
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Granted: 1984-06-26
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Expires: 2001-09-25
Abstract
Abstract Lifting apparatus in combination with at least one substantially upright wall having an opening therein for providing access through the wall. The preferred combination comprises a vehicle, such as, a van (1), having a rear or side door opening therein, the lifting apparatus including a generally planar, load support portion (12) which is movable between a storage position (A,C) interior of the vehicle (1) and an operative position (B) exterior of the vehicle. In the operative position (B), the load support portion (12) lies in a generally horizontal plane substantially normal to that of the vehicle opening, with the support portion (12) being movable between its storage position (A,C) and its operative position (B) via an intermediate, inoperative position exterior of the vehicle (1). In this inoperative position, the load support portion (12) lies in a generally vertical plane substantially normal to that of the opening to provide substantially unobstructed access through the opening to the vehicle interior. The lifting apparatus preferably comprises a parallelogram-type raising and lowering portion (9,9') operated by a piston cylinder arrangement (8,8'), the load support portion (12) being pivotally movable between its intermediate and operative positions with respect to the raising and lowering portion.
Inventors
- 👤 Robert Robson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:02
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/44; B60P1/4414; B60P1/4421; B60P1/4428; A; A61; A61G; A61G3/00; A61G3/02; A61G3/06; A61G3/062; B60P1/4442; Y; Y10; Y10S; Y10S414/00; Y10S414/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
287 words
In combination, at least one substantially upright wall defining an opening therein, for providing access through said wall, and lifting apparatus including a parallelogram-type raising and lowering portion that is extensible and collapsible in a first generally vertical plane and that comprises parallelogram linkage one side of which is secured against vertical movement and an opposite side of which moves bodily vertically, and a generally planar, load support portion connected thereto, said raising and lowering portion being pivotable about a generally vertical axis between a position on one side of said opening, wherein said load support portion lies in a second generally vertical plane generally parallel to said first plane in an inoperative storage position, and a position on the other side of said opening, wherein said load support portion lies in a third generally vertical plane substantially normal to that of said opening and generally parallel to said first plane in an intermediate inoperative position, said load support portion being pivotable about a generally horizontal axis with respect to said raising and lowering portion between said intermediate position and an operative position, wherein it lies in a generally horizontal plane substantially normal to that of said opening and on said other side thereof, said raising and lowering portion being actuable to move said load support portion, in its operative position, between raised and lowered positions with respect to said opening, and the connection between said load support portion and said raising and lowering portion being horizontal pivot means having an axis parallel to said first plane and integral with said opposite side of said parallelogram linkage such that said load support portion is immovable about a vertical axis with respect to said raising and lowering portion.
Claim 2
Dependent Claim
287 words
In combination, at least one substantially upright wall defining an opening therein, for providing access through said wall, and lifting apparatus including a parallelogram-type raising and lowering portion that is extensible and collapsible in a first generally vertical plane and that comprises parallelogram linkage one side of which is secured against vertical movement and an opposite side of which moves bodily vertically, and a generally planar, load support portion connected thereto, said raising and lowering portion being pivotable about a generally vertical axis between a position on one side of said opening, wherein said load support portion lies in a second generally vertical plane generally parallel to said first plane in an inoperative storage position, and a position on the other side of said opening, wherein said load support portion lies in a third generally vertical plane substantially normal to that of said opening and generally parallel to said first plane in an intermediate inoperative position, said load support portion being pivotable about a generally horizontal axis with respect to said raising and lowering portion between said intermediate position and an operative position, wherein it lies in a generally horizontal plane substantially normal to that of said opening and on said other side thereof, said raising and lowering portion being actuable to move said load support portion, in its operative position, between raised and lowered positions with respect to said opening, and the connection between said load support portion and said raising and lowering portion being horizontal pivot means having an axis parallel to said first plane and integral with said opposite side of said parallelogram linkage such that said load support portion is immovable about a vertical axis with respect to said raising and lowering portion.
Claim 3
Dependent Claim
48 words
A combination according to claim 1, comprising a vehicle having a plurality of interior side walls, said generally vertical axis being disposed adjacent one of said walls, said load support portion being disposed between said raising and lowering portion and said one wall in said inoperative storage position.
Claim 4
Dependent Claim
41 words
A combination according to claim 1, wherein said raising and lowering portion can be positioned in alternative storage positions on said one side of the opening with said load support portion lying in respective, generally vertical planes in an inoperative position.
Claim 5
Dependent Claim
36 words
A combination according to claim 1, wherein said raising and lowering portion is pivotally movable, in unison with said load support portion, between said inoperative positions on said one and said other side of the opening.
Claim 6
Dependent Claim
80 words
A combination according to claim 1, wherein said raising and lowering portion is actuable, to move said load support portion between said raised and lowered positions with respect to said opening, by means of an electro-mechanically operable piston/cylinder arrangement of which one end is attached to one side of said raising and lowering portion connected to said load support portion and the other end is attached to another side of said raising and lowering portion adjacent said one side thereof.
Claim 7
Dependent Claim
44 words
A combination according to claim 1, wherein said load support portion is movable between its intermediate inoperative and operative positions with respect to said raising and lowering portion, with said load support portion in fully raised and lowered positions with respect to said opening.
Claim 8
Dependent Claim
44 words
A combination according to claim 6, wherein said load support portion is movable between its intermediate inoperative and operative positions with respect to said raising and lowering portion at any position between its fully raised and fully lowered positions with respect to said opening.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |