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US 3,967,570 AGranted
Floating dock boat lift
OwnerC. C. Bradfieldinventor
Life of this patent
Estimating the term…
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.
Claims6
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.
8 more elements
Dependencies are inferred from the claim text.