US3854592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable capacity crane hoist
Assignee: EDERER Inc
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Filing: 1973-05-25
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Granted: 1974-12-17
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Expires: 1993-05-25
Abstract
Abstract A convertible crane is provided with a main trolley which carries a powered hoist along a pair of girders and a trailer trolley which carries a set of sheaves. A traveling block is reeved by a line to sheaves on the main trolley and to sheaves on the the trailer trolley. The trailer trolley increases the load carrying capacity of the main trolley by increasing the number of parts of line and increasing the number of load bearing points on the girders and the distance between these points. The main trolley is designed to carry ordinary loads with the trailer trolley being employed only for initial high capacity loads.
Inventors
- 👤 S Mordre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:37
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/04; B66D3/043; B66C; B66C11/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
170 words
A convertible crane suitable for large-capacity temporary use and long-life, lower capacity ordinary use comprising primary support means movable along a horizontal surface and carrying powered hoist means for lowering and and raising a line, means on said primary support means for propelling the primary support means along said horizontal surface, said hoist means being designed for ordinary use substantially less than the capacity for said temporary use, and secondary support means on said horizontal surface for supporting auxiliary sheave means for receiving said line, movement of said primary and secondary support means along said horizontal surface being powered by said propelling means on said primary support means and traveling block means for receiving said line from said hoist means and said auxiliary sheave means and adapted to be connected to a load whereby the combined primary and secondary support means increases the load capacity of the crane to said large capacity for temporary use but without substantially increasing the size of the primary support means and powered hoist means.
Claim 2
Dependent Claim
170 words
A convertible crane suitable for large-capacity temporary use and long-life, lower capacity ordinary use comprising primary support means movable along a horizontal surface and carrying powered hoist means for lowering and and raising a line, means on said primary support means for propelling the primary support means along said horizontal surface, said hoist means being designed for ordinary use substantially less than the capacity for said temporary use, and secondary support means on said horizontal surface for supporting auxiliary sheave means for receiving said line, movement of said primary and secondary support means along said horizontal surface being powered by said propelling means on said primary support means and traveling block means for receiving said line from said hoist means and said auxiliary sheave means and adapted to be connected to a load whereby the combined primary and secondary support means increases the load capacity of the crane to said large capacity for temporary use but without substantially increasing the size of the primary support means and powered hoist means.
Claim 3
Dependent Claim
44 words
The crane of claim 1 said traveling block including two sets of sheaves vertically overlying one another and removable from one another whereby one set of sheaves can be removed leaving a single set for said ordinary use to increase the speed of lifting.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1, said auxiliary sheave means being rotated solely by the line from said traveling block means.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3, said crane including girder means movable along a track, said horizontal surface including an upper end of said girder means.
Claim 6
Dependent Claim
161 words
A convertible crane suitable for large capacity temporary use and long-life, lower capacity ordinary use comprising primary support means carrying powered hoist means for lowering and raising a line, said hoist means being designed for ordinary use substantially less than the capacity for said temporary use, and secondary support means for supporting auxiliary sheave means for receiving said line, and traveling block means for receiving said line from said hoist means and said auxiliary sheave means and adapted to be connected to a load whereby the combined primary and secondary support means increases the load capacity of the crane to said large capacity for temporary use but without substantially increasing the size of the pRimary support means and powered hoist means, said crane including girder means movable along a track, saId primary support means including a mobile primary trolley movable along said girder means, said secondary support means including a trailer trolley operatively connected to the primary trolley for movement therewith.
Claim 7
Dependent Claim
161 words
A convertible crane suitable for large capacity temporary use and long-life, lower capacity ordinary use comprising primary support means carrying powered hoist means for lowering and raising a line, said hoist means being designed for ordinary use substantially less than the capacity for said temporary use, and secondary support means for supporting auxiliary sheave means for receiving said line, and traveling block means for receiving said line from said hoist means and said auxiliary sheave means and adapted to be connected to a load whereby the combined primary and secondary support means increases the load capacity of the crane to said large capacity for temporary use but without substantially increasing the size of the pRimary support means and powered hoist means, said crane including girder means movable along a track, saId primary support means including a mobile primary trolley movable along said girder means, said secondary support means including a trailer trolley operatively connected to the primary trolley for movement therewith.
Claim 8
Dependent Claim
27 words
The apparatus of claim 5 said primary and trailer trolleys being joined by a compression member to withstand the compressive forces acting therebetween when lifting a load.
Claim 9
Dependent Claim
19 words
The apparatus of claim 5, said girder means including a pair of spaced girders movable jointly along said track.
Claim 10
Independent Claim
134 words
A method of temporarily increasing the capacity of a crane from a first capacity to a larger capacity comprising; providing a first hoist support capable of carrying loads only of a first capacity, self-propelling the first hoist support along a horizontal path, providing a second support spaced horizontally from said first hoist support along said horizontal surface and capable of carrying loads only of a second capacity less than said crane larger capacity, propelling said second support along said horizontal surface by movement of said first hoist support and providing a traveling block adapted for connection to a load supported by a line reeved in desired ratio from said first and second supports for increasing the capacity of the crane to said larger capacity by combining the capacities of said first and second supports.
Claim 11
Independent Claim
134 words
A method of temporarily increasing the capacity of a crane from a first capacity to a larger capacity comprising; providing a first hoist support capable of carrying loads only of a first capacity, self-propelling the first hoist support along a horizontal path, providing a second support spaced horizontally from said first hoist support along said horizontal surface and capable of carrying loads only of a second capacity less than said crane larger capacity, propelling said second support along said horizontal surface by movement of said first hoist support and providing a traveling block adapted for connection to a load supported by a line reeved in desired ratio from said first and second supports for increasing the capacity of the crane to said larger capacity by combining the capacities of said first and second supports.
Claim 12
Dependent Claim
24 words
The method of claim 8 including the step of reducing the load-carrying capacity of the crane by removing the second support from the crane.
Claim 13
Dependent Claim
80 words
The method of claim 8 wherein said second support carries a plurality of sheaves, said step of supporting the traveling block including reeving a line between said second support, said first support and two vertically spaced sets of sheaves on said traveling block and including the step of increasing the lifting speed of said crane by removing the line from said second support and one set of sheaves on said traveling block to increase the lifting speed of the hoist.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |