Patent US3856342A successfully refreshed from Google Patents.
US3856342A
Expired / Lapsed
US
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Pantographic cargo hoist
Assignee: Individual
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Filing: 1973-05-14
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Granted: 1974-12-24
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Expires: 1993-05-14
Abstract
Abstract A hoist is provided wherein a clamping mechanism has four walls, each of the walls comprising a plurality of interconnecting pantographs, whereby the cross-sectional area of the clamping mechanism may be increased when the clamping mechanism is retracted to a release position. In this release position, the walls of the clamping mechanism are placed about a load to be lifted. The walls of the clamping mechanism are then extended to a clamping position decreasing the cross-sectional area, and engaging the sides of the load. The force required to lift the load is uniformly distributed over each of the sides of the load to be lifted.
Inventors
- 👤 J Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:46
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/28; B66C1/30; B66C1/42; B66C1/44; B66C1/442
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
150 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a plurality of uniformly dimensioned planar walls, each of said planar walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, at least two of said pantographs having a common corner, the pantographs each comprised of members pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides, and means to retract all of the planar walls of the structure to a release position, whereby the cross-sectional area defined by the planar walls is uniformly increased and to elongate the planar walls to a clamping position, whereby the crosssectional area is uniformly diminished, and the walls may engage a load to be moved.
Claim 2
Dependent Claim
150 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a plurality of uniformly dimensioned planar walls, each of said planar walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, at least two of said pantographs having a common corner, the pantographs each comprised of members pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides, and means to retract all of the planar walls of the structure to a release position, whereby the cross-sectional area defined by the planar walls is uniformly increased and to elongate the planar walls to a clamping position, whereby the crosssectional area is uniformly diminished, and the walls may engage a load to be moved.
Claim 3
Dependent Claim
9 words
The apparatus of claim 1, which includes four walls.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2, wherein each of said walls includes a plurality of interconnected pantographs on each wall, each succeeding set of pantographs having a common corner and two common sides.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3, which includes means to secure slideably the corners, whereby dimensional stability is imparted to the clamping mechanism.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4, wherein the means to secure slideably the corners of said walls includes arm-like members.
Claim 7
Dependent Claim
20 words
The apparatus of claim 5, wherein the arm-like members include a channel adapted to receive the corners of the pantographs.
Claim 8
Dependent Claim
20 words
The apparatus of claim 1, wherein pantographs are defined by a plurality of bar-like members, pivotally connected at their centers.
Claim 9
Dependent Claim
29 words
The apparatus of claim 1, wherein the means to retract and elongate the walls of the clamping mechanism includes lift bars pivotally connected to the walls of the mechanism.
Claim 10
Dependent Claim
31 words
The apparatus of claim 1, wherein the means to retract and elongate the walls between its release and clamping position includes means to withdraw the clamping mechanism to its release position.
Claim 11
Dependent Claim
164 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a pluRality of walls, each of said walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, each succeeding set of pantographs having a common corner and two common sides, the pantographs each comprised of members pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides; means to secure slideably the corners of the mechanism, whereby dimensional stability is imparted to the clamping mechanism; and means to retract all of the walls of the structure to a release position whereby the cross-sectional area defined by the walls is uniformly increased and to elongate the wall to a clamping position whereby the cross-sectional area is uniformly diminished and the walls may engage the load to be moved.
Claim 12
Dependent Claim
164 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a pluRality of walls, each of said walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, each succeeding set of pantographs having a common corner and two common sides, the pantographs each comprised of members pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides; means to secure slideably the corners of the mechanism, whereby dimensional stability is imparted to the clamping mechanism; and means to retract all of the walls of the structure to a release position whereby the cross-sectional area defined by the walls is uniformly increased and to elongate the wall to a clamping position whereby the cross-sectional area is uniformly diminished and the walls may engage the load to be moved.
Claim 13
Dependent Claim
22 words
The apparatus of claim 10, wherein the means to secure slideably the corners includes a channel-like structure adapted to receive the corners.
Claim 14
Dependent Claim
9 words
The apparatus of claim 10, which includes four walls.
Claim 15
Dependent Claim
14 words
The apparatus of claim 10, wherein the walls of the mechanism are circularly configured.
Claim 16
Dependent Claim
19 words
The apparatus of claim 13, wherein expandible cushioning means are disposed on the inner surface of the clamping mechanism.
Claim 17
Dependent Claim
153 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a plurality of walls, each of said walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, each succeeding set of pantographs having a common corner and two common sides, the pantographs each comprised of members pivotally connected at their ends one to the other, such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides, and means to retract all of the walls of the structure to a release position, whereby the cross-sectional area defined by the walls is uniformly increased and to elongate the walls to a clamping position, whereby the cross-sectional area is uniformly diminished, and the walls may engage the load to be moved.
Claim 18
Dependent Claim
153 words
A hoisting apparatus which comprises in combination: a clamping mechanism having a plurality of walls, each of said walls including at least two sides of a pantograph, the entire clamping mechanism including a plurality of interconnected pantographs, each succeeding set of pantographs having a common corner and two common sides, the pantographs each comprised of members pivotally connected at their ends one to the other, such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs of the clamping mechanism defining the sides, and means to retract all of the walls of the structure to a release position, whereby the cross-sectional area defined by the walls is uniformly increased and to elongate the walls to a clamping position, whereby the cross-sectional area is uniformly diminished, and the walls may engage the load to be moved.
Claim 19
Dependent Claim
16 words
The apparatus of claim 15, which includes means to secure slideably the corners of said walls.
Claim 20
Dependent Claim
11 words
The apparatus of claim 16, wherein the apparatus includes four walls.
Claim 21
Dependent Claim
13 words
The apparatus of claim 16, wherein the walls are planar and uniformly dimensioned.
Claim 22
Dependent Claim
14 words
The apparatus of claim 15, wherein the walls of the mechanism are circularly configured.
Claim 23
Dependent Claim
19 words
The apparatus of claim 19, wherein expandible cushioning means are disposed on the inner surface of the clamping mechanism.
Claim 24
Independent Claim
132 words
A method of hoisting cargo which includes: placing a clamping mechanism having a plurality of uniformly dimensioned planar walls, each of said planar walls having a plurality of interconnected pantographs, each of said succeeding pantographs having a common corner and two common sides, the members comprising the pantographs each pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs, about a load to be lifted; diminishing uniformly the cross-sectional area of the walls of the structure; engaging the walls of the load to be lifted and distributing the force required to lift the load uniformly over the sides of the load to be lifted; and lifting the load while so engaged.
Claim 25
Independent Claim
132 words
A method of hoisting cargo which includes: placing a clamping mechanism having a plurality of uniformly dimensioned planar walls, each of said planar walls having a plurality of interconnected pantographs, each of said succeeding pantographs having a common corner and two common sides, the members comprising the pantographs each pivotally connected such that the movement of any one of the members of any pantograph will effect a corresponding movement in all of the members of all of the other pantographs, about a load to be lifted; diminishing uniformly the cross-sectional area of the walls of the structure; engaging the walls of the load to be lifted and distributing the force required to lift the load uniformly over the sides of the load to be lifted; and lifting the load while so engaged.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |