US3895592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat lift
Assignee: LOESS Corp A CORP OF
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Filing: 1974-01-09
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Granted: 1975-07-22
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Expires: 1994-01-09
Abstract
Abstract One embodiment of a boat lift utilizes elongated, upendable floats of polyurethane material which project more deeply into the water when the floats are upright than when they are prone. Attachment of the carriage of the lift to the floats adjacent their ''''sinking ends'''' causes the carriage to be submerged when the floats are upright and to be raised for supporting a boat when the floats are in their prone positions. A second embodiment of the lift utilizes hollow pontoons which may be filled with water or air to cause submersion or flotation of the lift and which are rotatable between float positions in which air supplied to the pontoons is trapped therein, and sink positions in which air is allowed to exhaust from the pontoon while water flows thereinto. Diametrically opposed air pockets on the outside of the pontoons cause automatic return thereof from their sink positions to their float positions, and outlet tubes projecting downwardly from the pontoons when the latter are in their float positions prevent air from escaping from the pontoons during rough water conditions.
Inventors
- 👤 Arthur Shelley King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:45
CPC Classifications
B; B63; B63C; B63C1/00; B63C1/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
A boat lift comprising: a carriage; a tubular, essentially closed, elongated pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means rotatably mounting said pontoon on the carriage for rotation of the pontoon about its longitudinal axis between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter.
Claim 2
Dependent Claim
96 words
A boat lift comprising: a carriage; a tubular, essentially closed, elongated pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means rotatably mounting said pontoon on the carriage for rotation of the pontoon about its longitudinal axis between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter.
Claim 3
Dependent Claim
34 words
A boat lift as claimed in claim 1, wherein said outlet means includes a tube projecting outwardly from said wall for protrusion downwardly into the water when the pontoon is in its float position.
Claim 4
Dependent Claim
27 words
A boat lift as claimed in claim 2, wherein said tube both exhausts air and receives water when the pontoon is initially rotated to its sink position.
Claim 5
Dependent Claim
43 words
A boat lift as claimed in claim 1, wherein said outlet means includes a pair of tubes projecting outwardly from said wall, one for primarily receiving water and the other for primarily discharging air when the pontoon is rotated to its sink position.
Claim 6
Dependent Claim
168 words
A boat lift comprising: a carriage; a tubular, essentially closed pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said outlet means including a pair of tubes projecting outwardly from said wall, one for primarily receiving water and the other for primarily discharging air when the pontoon is moved to its sink position, said pontoon being mounted on said carriage for rotation between said positions, said other tube being spaced from said one tube along the path of rotation of the pontoon to project out of the water when the pontoon is rotated to its sink position.
Claim 7
Dependent Claim
168 words
A boat lift comprising: a carriage; a tubular, essentially closed pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said outlet means including a pair of tubes projecting outwardly from said wall, one for primarily receiving water and the other for primarily discharging air when the pontoon is moved to its sink position, said pontoon being mounted on said carriage for rotation between said positions, said other tube being spaced from said one tube along the path of rotation of the pontoon to project out of the water when the pontoon is rotated to its sink position.
Claim 8
Dependent Claim
123 words
A boat lift comprising: a carriage; a tubular, essentially closed, elongated pontoon having a contInuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means rotatably mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said pontoon being mounted for rotation about its longitudinal axis between said positions and being provided with means for automatically returning the same from its sink position to its float position.
Claim 9
Dependent Claim
123 words
A boat lift comprising: a carriage; a tubular, essentially closed, elongated pontoon having a contInuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means rotatably mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said pontoon being mounted for rotation about its longitudinal axis between said positions and being provided with means for automatically returning the same from its sink position to its float position.
Claim 10
Dependent Claim
30 words
A boat lift as cliamed in claim 6, wherein said return means comprises a pair of diametrically opposed air pockets on the outside of said pontoon sealed from said chamber.
Claim 11
Dependent Claim
118 words
A boat lift comprising: a carriage; a tubular, essentially closed pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said pontoon being elongated and being mounted for rotation between said positions about its longitudinal axis, said outlet means being spaced laterally from said axis of the pontoon.
Claim 12
Dependent Claim
118 words
A boat lift comprising: a carriage; a tubular, essentially closed pontoon having a continuous outer wall defining a chamber within the pontoon and provided with inlet means and outlet means; and means mounting said pontoon on the carriage for movement of the pontoon between a float position wherein said outlet means is submerged for trapping air within the chamber supplied through said inlet means and a sink position wherein said outlet means is open to the atmosphere for exhausting air from the chamber for entry of water into the latter, said pontoon being elongated and being mounted for rotation between said positions about its longitudinal axis, said outlet means being spaced laterally from said axis of the pontoon.
Claim 13
Dependent Claim
25 words
A boat lift as claimed in claim 8, wherein said inlet is located at one end of said pontoon in association with said mounting means.
Claim 14
Dependent Claim
36 words
A boat lift as claimed in claim 1, wherein said carriage is provided with a second rotatably mounted pontoon spaced from said first-mentioned pontoon, said carriage further being provided with means for operating the pontoons simultaneously.
Claim 15
Dependent Claim
22 words
A boat lift as claimed in claim 10, wherein said operating means includes cable means operable from a boat overlying said carriage.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |