US3753355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting dry dock
Assignee: Individual
•
Filing: 1971-12-02
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Granted: 1973-08-21
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Expires: 1991-12-02
Abstract
Abstract A lifting dry dock for lifting a boat out of the water comprising a subsurface support, a cradle for cradling the boat, and a plurality of legs pivotally connecting the cradle to the subsurface support in a manner which permits movement of the cradle between a lowered position in which the cradle is below the surface of the water a distance sufficient to permit the boat to float thereover and a raised position in which the cradle is clear of the water. A winch is provided for effecting movement of the cradle between its lowered position and its raised position.
Inventors
- 👤 G Knoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:24
CPC Classifications
B; B63; B63C; B63C3/00; B63C3/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
A lifting dry dock for lifting a boat out of the water comprising a floating dock having lower portions adapted to lie below the surface of the water when said dry dock is floating on the water, these lower portions constituting a subsurface support, and a deck adapted to extend above the surface of the water, said lifting dry dock further comprising a cradle for cradling the boat, pivoted linkage means pivotally mounted on said subsurface support and having pivotal connections with said cradle mounting said cradle for movement between a lowered position in which the cradle is below the surface of the water a distance sufficient to permit the boat to float thereover and a raised position in which the cradle is clear of the water, said deck forming a boat slip in which said cradle is mounted for movement between its lowered position and its raised position, a winch positioned above and forward of the front end of said cradle, said winch being fixedly mounted relative to said floating dry dock at one end, constituting the forward end, of said slip and having a flexible cable for effecting movement of the cradle between its lowered position and its raised position upon operation of the winch.
Claim 2
Dependent Claim
207 words
A lifting dry dock for lifting a boat out of the water comprising a floating dock having lower portions adapted to lie below the surface of the water when said dry dock is floating on the water, these lower portions constituting a subsurface support, and a deck adapted to extend above the surface of the water, said lifting dry dock further comprising a cradle for cradling the boat, pivoted linkage means pivotally mounted on said subsurface support and having pivotal connections with said cradle mounting said cradle for movement between a lowered position in which the cradle is below the surface of the water a distance sufficient to permit the boat to float thereover and a raised position in which the cradle is clear of the water, said deck forming a boat slip in which said cradle is mounted for movement between its lowered position and its raised position, a winch positioned above and forward of the front end of said cradle, said winch being fixedly mounted relative to said floating dry dock at one end, constituting the forward end, of said slip and having a flexible cable for effecting movement of the cradle between its lowered position and its raised position upon operation of the winch.
Claim 3
Dependent Claim
81 words
A lifting dry dock as set forth in claim 1 wherein said cradle comprises a frame having means extending upwardly therefrom at one end thereof constituting its forward end for mooring thereto of one end of the boat prior to and during the raising of the cradle, whereby the boat floating above the cradle is held in position adjacent said mooring means to be lifted by the cradle as the cradle is raised from its lowered position to its raised position.
Claim 4
Dependent Claim
107 words
A lifting dry dock as set forth in claim 2 wherein said mooring means comprises a post secured to and extending upwardly from the forward end of said frame, said post having a vertical slot therein into which a fitting carried by the said one end of said boat is adapted to be inserted, said flexible cable being adapted to be attached to said fitting as inserted into said slot in said post whereby retraction of said cable by the winch holds the boat against said post and exerts a lifting force on said cradle to raise the cradle from its lowered position to its raised position.
Claim 5
Dependent Claim
58 words
A lifting dry dock as set forth in claim 1 wherein said pivoted linkage means is a parallel linkage means having a plurality of leg members pivotally connected at their ends to said cradle and to said support, whereby said cradle is maintained in a substantially horizontal position as it is moved between its lowered and raised positions.
Claim 6
Dependent Claim
47 words
A lifting dry dock as set forth in claim 2 wherein said frame includes a pair of spaced-apart side rails extending the length of said cradle, a plurality of cross members extending between the side rails, and a plurality of cradle members adapted to support the boat.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |