US3734046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating dry dock
Assignee: CARSWELL L MANUF CO FIRMAN
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Filing: 1971-05-10
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Granted: 1973-05-22
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Expires: 1991-05-10
Abstract
Abstract A floating dry dock consisting of a buoyant platform having a section adapted to be pivoted downwardly to form a ramp extending at its free edge beneath the water level, and up which a boat may be pulled from the water to the platform, the ramp section having sufficient buoyancy to support the boat, or that portion of the boat weight eventually supported thereon, cable mechanism for pivoting the ramp section downwardly against its natural buoyancy, cable mechanism for pulling a boat upwardly along the ramp section, locks for holding the ramp section releasably in its elevated position, and supports on the platform and ramp section for carrying the boat.
Inventors
- 👤 O Schmidt
- 👤 R Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:00
CPC Classifications
B; B63; B63C; B63C3/00; B63C3/02; B63C1/00; B63C1/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
211 words
A floating dry dock comprising: a. a generally planar, buoyant dock platform adapted to float in the water with the floor thereof above the water level, b. a ramp pivoted at one edge to said platform for vertical movement between an elevated position coplanar with said platform floor to a depressed position wherein it is inclined downwardly from said platform floor and its free edge is disposed at or below the water level, c. ramp operating means carried by said platform and operable to move said ramp between said elevated and depressed positions, said ramp being sufficiently buoyant to rise to coplanar relation with said platform floor under the weight of that portion of the weight of the boat eventually supported thereby, and wherein said ramp operating means is operable to pivot said ramp downwardly against its natural buoyancy, d. boat supporting means carried by said platform and ramp and operable to support a boat thereon for movement transverse to the pivotal axis of said ramp, and e. boat loading means carried by said platform and operable, when said ramp is depressed, to pull a boat supported by said supporting means up said ramp and onto said platform, whereby said boat is positioned on and supported by said platform and ramp.
Claim 2
Dependent Claim
211 words
A floating dry dock comprising: a. a generally planar, buoyant dock platform adapted to float in the water with the floor thereof above the water level, b. a ramp pivoted at one edge to said platform for vertical movement between an elevated position coplanar with said platform floor to a depressed position wherein it is inclined downwardly from said platform floor and its free edge is disposed at or below the water level, c. ramp operating means carried by said platform and operable to move said ramp between said elevated and depressed positions, said ramp being sufficiently buoyant to rise to coplanar relation with said platform floor under the weight of that portion of the weight of the boat eventually supported thereby, and wherein said ramp operating means is operable to pivot said ramp downwardly against its natural buoyancy, d. boat supporting means carried by said platform and ramp and operable to support a boat thereon for movement transverse to the pivotal axis of said ramp, and e. boat loading means carried by said platform and operable, when said ramp is depressed, to pull a boat supported by said supporting means up said ramp and onto said platform, whereby said boat is positioned on and supported by said platform and ramp.
Claim 3
Dependent Claim
35 words
A floating dry dock as recited in claim 1 with the addition of stop means operable to limit the upward pivoting of said ramp to the position in which it is coplanar with said platform.
Claim 4
Dependent Claim
25 words
A floating dry dock as recited in claim 1 with the addition of locking means operable to secure said ramp releasably in its elevated position.
Claim 5
Dependent Claim
53 words
A floating dry dock as recited in claim 1 wherein said ramp operating means comprises: a. a cable affixed to said ramp and operable by tension thereon to pivot said ramp downwardly, and b. a manually operable winch carried by said platform and including a rotatable drum on which said cable is wound.
Claim 6
Dependent Claim
36 words
A floating dry dock as recited in claim 4 with the addition of a block-and-tackle device interposed in the cable connection between said winch and said ramp, whereby the mechanical advantage of said winch is multiplied.
Claim 7
Dependent Claim
68 words
A floating dry dock as recited in claim 4 wherein said boat loading means comprises a second manually operable winch carried by said platform and including a rotatable drum and a cable wound on said drum, the extended end portion of said cable being adapted to project generally horizontally outwardly from said dock, over the ramp thereof, for attachment to a boat in the water approaching said ramp.
Claim 8
Dependent Claim
60 words
A floating dry dock as recited in claim 6 wherein both of said winches are mounted on a single post projecting upwardly from said platform, and removably mounted at its lower end in a socket provided therefor in said platform, whereby removal of said post and the winches mounted thereon assists in clearing the floor of said platform when desired.
Claim 9
Dependent Claim
62 words
A floating dry dock as recited in claim 7 wherein said boat supporting means comprises keel and cradle rollers mounted on said platform and ramp, above the floors thereof, by means easily detachable from said platform and ramp, whereby detachment and removal of said rollers and their supporting means assists in clearing the floors of said platform and said dock when desired.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |