Patent US3640413A successfully refreshed from Google Patents.
US3640413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat crane
Assignee: Individual
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Filing: 1969-12-29
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Granted: 1972-02-08
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Expires: 1989-12-29
Abstract
Abstract Straddle-type boat crane for lowering and lifting boats into and out of the water and for transporting them to and from the water. The crane includes fixed position forward and rear hoists, the latter being free of any fixed or movable transverse member and providing unlimited inside clear height at all times for ease and convenience in handling boats having high superstructures or tall spars.
Inventors
- 👤 Carl Robert Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:04
CPC Classifications
B; B63; B63C; B63C3/00; B63C3/12; B60; B60P; B60P3/00; B60P3/06; B60P3/10; B60P3/1091
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
A straddle-type crane comprising a frame having laterally spaced apart, longitudinally extending tubular side rails unjoined at least at their laterally opposite one ends to provide an open end to the frame, said tubular side rails having a large average transverse dimension to provide rails having a substantial resistance to bending in all directions and to twisting about their axes, means for movably supporting the frame generally horizontally above the ground, a forward hoist extending transversely of and spanning the distance between the rails at a point between their ends, said forward hoist being substantially rigid and rigidly mounted on and connected to the side rails, an aft hoist adjacent the open end of the frame and comprising a substantially stiff member rigidly mounted on and connected to and extending upwardly from the other end of each of the side rails and substantially clear of the space between them, each upwardly extending member being independent of and free of any transverse structural connection with the other, forward sling means adjustable vertically with respect to and supported from said forward hoist at two laterally spaced apart points and substantially spanning the distance between the rails and aft sling means adjustable vertically with respect to and supported from both of said upwardly extending members and spanning the space between them.
Claim 2
Dependent Claim
218 words
A straddle-type crane comprising a frame having laterally spaced apart, longitudinally extending tubular side rails unjoined at least at their laterally opposite one ends to provide an open end to the frame, said tubular side rails having a large average transverse dimension to provide rails having a substantial resistance to bending in all directions and to twisting about their axes, means for movably supporting the frame generally horizontally above the ground, a forward hoist extending transversely of and spanning the distance between the rails at a point between their ends, said forward hoist being substantially rigid and rigidly mounted on and connected to the side rails, an aft hoist adjacent the open end of the frame and comprising a substantially stiff member rigidly mounted on and connected to and extending upwardly from the other end of each of the side rails and substantially clear of the space between them, each upwardly extending member being independent of and free of any transverse structural connection with the other, forward sling means adjustable vertically with respect to and supported from said forward hoist at two laterally spaced apart points and substantially spanning the distance between the rails and aft sling means adjustable vertically with respect to and supported from both of said upwardly extending members and spanning the space between them.
Claim 3
Dependent Claim
31 words
The straddle-type crane of cLaim 1 in which the side rails of the frame are joined together at their laterally opposite other ends to provide a closed end to the frame.
Claim 4
Dependent Claim
16 words
The straddle-type crane of claim 1 in which the side rails have a large-diameter circular section.
Claim 5
Dependent Claim
46 words
The straddle-type crane of claim 1 in which the side rails have structural reinforcement in a plane normal to their axes and adjacent the upwardly extending members mounted thereon, the reinforcement tending to strengthen the tubular side rails against collapse of their sections under operating loads.
Claim 6
Dependent Claim
60 words
The straddle-type crane of claim 4 in which the means for movably supporting the frame comprise at least one wheel associated with each rail, each such wheel being mounted for rotation on an axis normal to the longitudinal axis of its associated rail and substantially vertically beneath the upwardly extending member of the aft hoist mounted on its associated rail.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |