초록 ▼

A hydraulic lift device for in-water boat hoists. A hydraulic cylinder is utilized to extend and retract a cylindrical rod with a vertical cross member at its end. Lift cables are attached to the cross member on opposite sides and extend rearwardly toward the hydraulic cylinder. One cable is horizon

A hydraulic lift device for in-water boat hoists. A hydraulic cylinder is utilized to extend and retract a cylindrical rod with a vertical cross member at its end. Lift cables are attached to the cross member on opposite sides and extend rearwardly toward the hydraulic cylinder. One cable is horizontally reversed, 180° by a pulley, with both cables then directed 90° downward over respective pulleys and affixed to opposite ends of the cradle of the hoist, equalizing end to end lift. Side to side lift may be equalized by a second parallel device or by levelings cables. Primary components are contained within an attached enclosure, above water level. Remote operation and solar power may be provided.

대표청구항 ▼

A hydraulic lift device for in-water boat hoists. A hydraulic cylinder is utilized to extend and retract a cylindrical rod with a vertical cross member at its end. Lift cables are attached to the cross member on opposite sides and extend rearwardly toward the hydraulic cylinder. One cable is horizon

A hydraulic lift device for in-water boat hoists. A hydraulic cylinder is utilized to extend and retract a cylindrical rod with a vertical cross member at its end. Lift cables are attached to the cross member on opposite sides and extend rearwardly toward the hydraulic cylinder. One cable is horizontally reversed, 180° by a pulley, with both cables then directed 90° downward over respective pulleys and affixed to opposite ends of the cradle of the hoist, equalizing end to end lift. Side to side lift may be equalized by a second parallel device or by levelings cables. Primary components are contained within an attached enclosure, above water level. Remote operation and solar power may be provided. 5. The concrete finishing apparatus of claim 4 including a laser leveling system, said rotatable finishing member being vertically adjustable in response to said laser leveling system. 6. The concrete finishing apparatus of claim 1, wherein said rotatable finishing member is variably weighted to adjust or vary an amount of force or downward pressure being applied to the partially cured concrete by said rotatable finishing member. 7. The concrete finishing apparatus of claim 1, wherein said at least one support spreads the weight of said movable unit over an area of the partially cured concrete to limit depression of the partially cured concrete by said movable unit. 8. The concrete finishing apparatus of claim 7, wherein said at least one support comprises at least one tire. 9. The concrete finishing apparatus of claim 8, wherein said movable unit is adjustably weighted to adjust an amount of down pressure of said rotatable finishing member on the partially cured concrete surface. 10. The concrete finishing apparatus of claim 7, wherein said at least one support comprises at least four inflatable tires. 11. The concrete finishing apparatus of claim 7, wherein said at least one support comprises at least two elongated rollers which are rotatable to move said movable unit over the concrete surface. 12. The concrete finishing apparatus of claim 7, wherein said at least one support comprises at least two continuous tacks. 13. The concrete finishing apparatus of claim 1, wherein said movable unit comprises an air cushion unit which is operable to generate a cushion of air beneath said air cushion unit, said at least one support comprising said cushion of air generally between said movable unit and the surface of the uncured concrete. 14. The concrete finishing apparatus of claim 1, wherein said movable unit comprises a power trowel device. 15. The concrete finishing apparatus of claim 1, wherein said at least one rotatable finishing member comprises two rotatable finishing members positioned at opposite ends of said movable unit. 16. The concrete finishing apparatus of claim 15, wherein one of said two rotatable finishing members is lowerable to contact and smooth the partially cured concrete surface when said movable unit is moved in said first direction, while the other of said two rotatable finishing members is lowerable to contact and smooth the partially cured concrete surface when said movable unit is moved in a second direction, said second direction being generally opposite said first direction. 17. The concrete finishing apparatus of claim 1, wherein said at least one rotatable finishing member is mounted at said movable unit such that said longitudinal axis of said at least one rotatable finishing member is generally normal to said first direction. 18. The concrete finishing apparatus of claim 1, wherein said at least one rotatable finishing member is mounted at said movable unit such that said longitudinal axis of said at least one rotatable finishing member is canted relative to said first direction. 19. The concrete finishing apparatus of claim 1, wherein said at least one rotatable finishing member is adjustably mounted at said movable unit such that said longitudinal axis of said at least one rotatable finishing member is adjustable to adjust an angle of said at least one rotatable finishing member relative to a direction of travel of said movable unit. 20. The concrete finishing apparatus of claim 1 including a scraping device for substantially removing residue from said rotatable finishing member as said rotatable finishing member rotatably engages the partially cured concrete surface. 21. A method for finishing a concrete surface of partially cured concrete comprising: providing a concrete finishing apparatus having a movable support and a rotatable finishing member mounted to said movable support, said rotatable finishing member defining a generally cylindrical contact surface for contacting a partially cured concrete surface; moving said movable support along the concrete surface such that said movable support is supported on the partially cured concrete surface, said movable support being supported on the partially cured concrete by at least one support at the partially cured concrete surface; engaging said contact surface with the partially cured concrete surface; and rotating said rotatable finishing member about a longitudinal axis of said finishing member to move said contact surface relative to the partially cured concrete surface as said movable support and said rotatable finishing member are moved along the partially cured concrete surface. 22. The method of claim 21, wherein moving said movable support includes moving said movable support in a first direction. 23. The method of claim 22, wherein rotating said rotatable finishing member includes rotating said rotatable finishing member to move an engaging portion of said contact surface in said first direction as said movable support moves in the first direction, said engaging portion engaging the partially cured concrete surface. 24. The method of claim 23 including positioning said rotatable finishing member behind said movable support as said movable support is moved in said first direction. 25. The method of claim 21, wherein rotating said rotatable finishing member includes rotating said rotatable finishing member at a speed such that said contact surface generates sufficient slippage over the partially cured concrete to smooth the concrete to a high quality finish. 26. The method of claim 21, wherein providing a concrete finishing apparatus includes providing a concrete finishing apparatus which includes a wheeled movable support having at least one wheel. 27. The method of claim 21 including adjusting a degree of down pressure exerted by said rotatable finishing member on the partially cured concrete surface. 28. The method of claim 27, wherein adjusting a degree of down pressure includes adjusting a weight of said rotatable finishing member. 29. The method or claim 21 including vertically adjusting a level of said rotatable finishing member relative to said movable support. 30. The method of claim 29, wherein vertically adjusting a level of said rotatable finishing member includes vertically adjusting a level of said rotatable finishing member in response to a laser leveling system. 31. The method of claim 21 including pivoting said rotatable finishing member about a generally vertical axis to adjust an angle of said rotatable finishing member relative to a direction of travel of said movable support. 32. The method of claim 21 including programming said concrete finishing apparatus to move and finish the partially cured concrete surface in a programmed manner. 33. A concrete finishing apparatus for smoothing and leveling partially cured concrete at a support surface comprises: a movable unit which is movable and supported on a partially cured concrete and is movable in a first direction, said movable unit comprising at least one support that engages the surface of the partially cured concrete and supports said movable unit on the partially cured concrete; and at least one rotatable finishing member rotatably mounted at a rearward end of said movable unit as said movable unit moves in said first direction, said at least one rotatable finishing member comprising an elongated generally cylindrical member having a longitudinal axis, said cylindrical member being rotatable about said longitudinal axis in a direction generally opposite said first direction, such that a contact surface of said cylindrical member engages the partially cured concrete surface and moves relative to the partially cured concrete surface in a direction generally opposite to said first direction, said rotatable finishing member being positionable to be at least partially supported on the partially cured concrete surface. 34. The concrete finishing apparatus of claim 33 including a se