US3967570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating dock boat lift
Assignee: Individual
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Filing: 1975-07-07
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Granted: 1976-07-06
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Expires: 1995-07-07
Abstract
Abstract A floating dock boat lift comprises a flat deck and a parent structure to which the deck is hinged. The free end of the deck over-lies a variable buoyancy chamber communicating by pipes or hoses to an inlet air pump on or near the parent structure and to an air release valve on or near the deck. Alternately, air venting, for buoyancy control in under-deck compartments, may be facilitated through valves at each compartment. The deck is provided with a combination metal and wood boat-supporting keel brace and underlying reinforcement members.
Inventors
- 👤 C. C. Bradfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:52
CPC Classifications
B; B63; B63C; B63C3/00; B63C3/06; B63C1/00; B63C1/02; B63C1/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
302 words
A floating dock boat lift comprising: a. a floating parent structure moored in position on a body of water, said structure including a substantially planar upper surface, b. multiple hinges operably secured to said parent structure, said parent structure having a length and width greater than a boat dock attached thereto, c. said boat deck including a substantially planar upper surface and bottom surface operably secured to said multiple hinges in such a manner as to secure said boat deck's upper surface co-planar with said parent structure's upper surface, said boat deck having a length and width greater than the boat to be lifted by the said boat deck, d. a keel brace securely affixed to said boat deck's upper surface, said keel brace further comprising: 1. two elongated spaced substantially parallel members secured to the upper surface of the said boat deck adapted to receive and support the keel of a boat and support said boat in an upright position, 2. an underlying, reinforcing wood member secured to the under surface of said boat deck extending between and in a parallel plane to said elongated spaced parallel members, 3. a metal reinforcing member securely affixed to said underlying, reinforcing wood member and projecting for the length of said underlying reinforcing wood member and said parallel members secured to the upper surface of said boat deck, e. an airtight, underlying compartment attached to the under surface of said boat deck, said airtight compartment having an upper surface and a bottom surface, f. an opening in the bottom surface of said airtight compartment adapted to permit the flow of water to and from said airtight compartment, g. a source of air under pressure, and h. multiple valves and air hoses for controlling the flow of air to and from said airtight underlying compartment.
Claim 2
Dependent Claim
302 words
A floating dock boat lift comprising: a. a floating parent structure moored in position on a body of water, said structure including a substantially planar upper surface, b. multiple hinges operably secured to said parent structure, said parent structure having a length and width greater than a boat dock attached thereto, c. said boat deck including a substantially planar upper surface and bottom surface operably secured to said multiple hinges in such a manner as to secure said boat deck's upper surface co-planar with said parent structure's upper surface, said boat deck having a length and width greater than the boat to be lifted by the said boat deck, d. a keel brace securely affixed to said boat deck's upper surface, said keel brace further comprising: 1. two elongated spaced substantially parallel members secured to the upper surface of the said boat deck adapted to receive and support the keel of a boat and support said boat in an upright position, 2. an underlying, reinforcing wood member secured to the under surface of said boat deck extending between and in a parallel plane to said elongated spaced parallel members, 3. a metal reinforcing member securely affixed to said underlying, reinforcing wood member and projecting for the length of said underlying reinforcing wood member and said parallel members secured to the upper surface of said boat deck, e. an airtight, underlying compartment attached to the under surface of said boat deck, said airtight compartment having an upper surface and a bottom surface, f. an opening in the bottom surface of said airtight compartment adapted to permit the flow of water to and from said airtight compartment, g. a source of air under pressure, and h. multiple valves and air hoses for controlling the flow of air to and from said airtight underlying compartment.
Claim 3
Dependent Claim
47 words
The invention of claim 1 wherein said parent structure substantially encloses said boat deck having: a. two elongated work areas extending parallel to the said keel brace, and b. a deck area interconnecting said multiple work areas, said boat deck being hingedly secured to said parent structure.
Claim 4
Dependent Claim
90 words
The invention of claim 1 wherein said means for controlling the flow of air to and from said airtight underlying compartments further comprises: a. a hose interconnecting said source of air under pressure to said airtight underlying compartment, b. an opening in the top of said airtight underlying compartment, and c. a valve having an open position and a closed position secured to said opening in said airtight compartment, said valve sealing said airtight compartment in the closed position and venting air from said airtight compartment in the open position.
Claim 5
Dependent Claim
33 words
The invention of claim 1 wherein said source of air under pressure comprises: a. an air compressor mounted on said floating dock boat lift, and b. motor means for driving said air compressor.
Claim 6
Dependent Claim
29 words
The invention of claim 1 wherein said source of air under pressure comprises: a. an electric powered centrifugal blower, and b. a battery means for powering said centrifugal blower.
Claim 7
Dependent Claim
59 words
The invention of claim 3 further comprising: a. multiple underlying airtight compartments secured to the bottom surface of the said boat deck, and b. multiple air vent valves and associated air hoses for controlling the flow of air under pressure to and from the individual multiple underlying airtight compartments permitting adjusting lift on various areas of said boat deck.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |