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US3789446A
Expired / Lapsed
US
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Unsinkable raft
Assignee: MULTI PRO Inc
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Filing: 1971-12-16
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Granted: 1974-02-05
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Expires: 1991-12-16
Abstract
Abstract An unsinkable raft comprising a plastic foam filled hull capped by a flat deck. An inwardly displaced bottom portion of the hull provides a substantially large central cavity in its underside which enhances the buoyancy and stability of the raft. The bottom of the cavity is spaced a distance beneath the deck, and an anchor line attaching eye disposed at its underside, is attached to an elongated girder confined in the space under the deck, so that the pull of an anchor line will be transmitted to surfaces of substantial area in the interior of the body.
Inventors
- 👤 J Rudelick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:49
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/24; B63B35/00; B63B35/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A raft having a hull characterized by: A. a monolithic body of sheet plastic material having 1. side walls which slope upwardly and outwardly from the bottom of the body, 2. an upwardly deformed bottom portion which defines a central substantially large and deep airtight cavity that opens to the underside of the body, 3. the side walls of the cavity sloping downwardly and outwardly at a substantially wide angle from vertical to the bottom of the body and cooperating therewith and with the body side walls to define a substantially deep trough which completely surrounds the cavity, 4. and the body side walls having greater height than the side walls of the cavity and having bent upper edge portions providing a continuous outwardly directed horizontal lip; B. and a flat deck supported on and secured to said lip, and extending over said upwardly deformed bottom portion in spaced relation thereto.
Claim 2
Dependent Claim
151 words
A raft having a hull characterized by: A. a monolithic body of sheet plastic material having 1. side walls which slope upwardly and outwardly from the bottom of the body, 2. an upwardly deformed bottom portion which defines a central substantially large and deep airtight cavity that opens to the underside of the body, 3. the side walls of the cavity sloping downwardly and outwardly at a substantially wide angle from vertical to the bottom of the body and cooperating therewith and with the body side walls to define a substantially deep trough which completely surrounds the cavity, 4. and the body side walls having greater height than the side walls of the cavity and having bent upper edge portions providing a continuous outwardly directed horizontal lip; B. and a flat deck supported on and secured to said lip, and extending over said upwardly deformed bottom portion in spaced relation thereto.
Claim 3
Dependent Claim
23 words
an upwardly deformed bottom portion which defines a central substantially large and deep airtight cavity that opens to the underside of the body,
Claim 4
Dependent Claim
23 words
an upwardly deformed bottom portion which defines a central substantially large and deep airtight cavity that opens to the underside of the body,
Claim 5
Dependent Claim
25 words
The raft of claim 1 wherein the entire space in the interior of the hull is filled with a rigid permanently buoyant plastic foam material.
Claim 6
Dependent Claim
36 words
The raft of claim 2, further characterized by indentations formed in imperforate portions of the body side walls at two opposite sides of the raft to define hand holds that facilitate lifting and carrying the raft.
Claim 7
Dependent Claim
43 words
the side walls of the cavity sloping downwardly and outwardly at a substantially wide angle from vertical to the bottom of the body and cooperating therewith and with the body side walls to define a substantially deep trough which completely surrounds the cavity,
Claim 8
Dependent Claim
43 words
the side walls of the cavity sloping downwardly and outwardly at a substantially wide angle from vertical to the bottom of the body and cooperating therewith and with the body side walls to define a substantially deep trough which completely surrounds the cavity,
Claim 9
Dependent Claim
52 words
and the body side walls having greater height than the side walls of the cavity and having bent upper edge portions providing a continuous outwardly directed horizontal lip; B. and a flat deck supported on and secured to said lip, and extending over said upwardly deformed bottom portion in spaced relation thereto.
Claim 10
Dependent Claim
52 words
and the body side walls having greater height than the side walls of the cavity and having bent upper edge portions providing a continuous outwardly directed horizontal lip; B. and a flat deck supported on and secured to said lip, and extending over said upwardly deformed bottom portion in spaced relation thereto.
Claim 11
Dependent Claim
103 words
The raft of claim 2, further characterized by: A. said raft being rectangular in plan; B. a framework of lightweight metal providing a rigid elongated girder which extends straight and substantially entirely across the raft parallel to and medially between two opposite sides of the raft and under its deck so as to be embedded in the foam material in the interior of the hull; C. an anchor line attaching eye exposed in the bottom portion of said cavity and having a part projecting through said upwardly deformed bottom portion; D. and means securing said part of the attaching eye to the girder.
Claim 12
Dependent Claim
61 words
The raft of claim 4, further characterized by: A. a rigid ladder at one side of the raft having a substantially inverted U-shape and an inboard leg which overlies an area of the deck directly over one end of said girder; B. and means securing said inboard leg of the ladder to the deck and to said end of the girder.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |