Modular floating boat lift

1. A boat lift comprising:

at least one parallelogram linkage supporting a cradle of boat bunks, the at least one parallelogram linkage including at least one aqueous hydraulic cylinder;

a plurality of pontoons for floating the boat lift on a water surface;

a base structure supporting the at least one parallelogram linkage and the plurality of pontoons, the base structure including beams made of a series of beam pieces such that lengths of the beams can be altered by changing a number of beam pieces using joining plates to thereby create a modular base structure, wherein the modular base structure facilitates field alterations; and

a plurality of channel float beams supporting the pontoons, the pontoons being of alterable length and movable position, by altering a number of modular floats used in the pontoons thereby allowing the boat lift to accommodate boats of different weights and to accommodate level lifting of boats with variable centers of gravity.

2. A boat lift comprising:

at least one parallelogram linkage supporting a cradle of boat bunks, the at least one parallelogram linkage including at least one aqueous hydraulic cylinder, the cradle having boat bunks being of alterable length;

a plurality of channel float beams that support a plurality of pontoons that float the boat lift on a water surface, the pontoons being of alterable length by altering a number of modular floats used in the pontoons thereby allowing the boat lift to accommodate boats of different weights;

a base structure supporting the at least one parallelogram linkage and the plurality of pontoons, the base structure including beams made of a series of beam pieces such that lengths of the beams can be altered by adding or removing beam pieces using joining plates to thereby create a modular base structure wherein the modular base structure facilitates field alterations, the beams including vertical support columns, base cross beams and base longitudinal beams of alterable length,

wherein the base cross beams and base longitudinal beams support the at least one parallelogram linkage I which supports the cradle of boat bunks and wherein a distance between the base longitudinal beams adjustable thereby making a distance between the boat bunks adjustable such that different boat weights and hull shapes can be accommodated between the boat bunks,

wherein the vertical support columns support the pontoons, and wherein a distance between the vertical support columns is adjustable thereby making a distance between the pontoons adjustable to accommodate different boat weights,

wherein shifting forward and aft the modular floats allows for level lifting of boats with variable centers of gravity,

wherein varying a number of parallelogram linkages and aqueous hydraulic cylinders accommodates boats of different weights.

3. A method of employing a boat lift, the method comprising:

assembling at least one aqueous hydraulic cylinder powered parallelogram linkage supporting a cradle of boat bunks and pontoons for floating the boat lift on a water surface;

varying capacity of the boat lift to accommodate boats of different weights using a modular base structure to facilitate field alterations of the boat lift by altering a number of beam pieces to beams of the base structure using joining plates;

altering a length of channel float beams that support the pontoons by-altering a number of modular floats used in the pontoons and thus varying a weight of boat that can be lifted; and

shifting forward and aft the modular floats to accommodate boats of varying centers of gravity to achieve level lift.

4. A method of employing a boat lift, the method comprising:

assembling at least one aqueous hydraulic cylinder powered parallelogram linkage supporting a cradle of boat bunks and pontoons for floating the boat lift on a water surface;

varying capacity of the boat lift to accommodate boats of different weights using a modular base structure to facilitate field alterations of the boat lift by altering a number of beam pieces to beams of the base structure by using joining plates to add or remove the beam pieces;

wherein varying capacity of the boat lift includes altering a length of base cross beams and base longitudinal beams of the base structure;

altering a length of the cradle having boat bunks;

altering a length of channel float beams that support the pontoons by-altering a number of modular floats used in the pontoons and thus varying a weight of boat that can be lifted;

shifting forward and aft modular floats on the channel float beams to achieve level lifting of boats with varying centers of gravity;

wherein the base cross beams and base longitudinal beams support the at least one parallelogram linkage which supports the cradle of boat bunks and wherein hinged sleeve brackets interconnect the base longitudinal beams and base cross beams such that the base longitudinal beams can be moved left or right along base cross beams;

adjusting a distance between the base longitudinal beams to alter a distance between the boat bunks such that different sized boat hulls can be accommodated between the boat bunks;

wherein the base structure includes vertical support columns attached to the pontoons and wherein the vertical support columns are interconnected by vertical sleeve brackets with the base cross beams such that the vertical support columns can be moved left or right along bass cross beams;

adjusting a distance between the vertical support columns to alter a distance between the pontoons to accommodate different sized boats; and

varying a number of parallelogram linkages and aqueous hydraulic cylinders to accommodate boats of different weights and sizes.

5. A boat lift comprising:

a base structure;

a cradle connected with the base structure and configured to support a boat;

a plurality of pontoons connected with the base structure for floating the boat lift on a water surface, the pontoons including a plurality of modular floats;

at least one parallelogram linkage for raising and lowering the cradle, the at least one parallelogram linkage connected with the base structure;

wherein the modular floats are attachable and detachable such that boats of varying weights are lifted; and

wherein the base structure includes a plurality of beam pieces, the beam pieces being attachable and detachable to make a modular base structure.

6. The boat lift of claim 5 wherein the at least one parallelogram linkage is made of a series of beam pieces such that the beam pieces of the parallelogram linkage are attachable and detachable to make at least one modular parallelogram linkage.

7. The boat lift of claim 6 wherein the at least one modular parallelogram linkage includes at least one aqueous hydraulic cylinder.

8. A method of employing the boat lift of claim 7 , the method comprising:

altering a number of the aqueous hydraulic cylinders coupled to the modular parallelogram linkage to change the capacity of the boat lift.

9. A method of employing the boat lift of claim 6 , the method comprising:

altering a number of beam pieces forming the modular parallelogram linkage to change the capacity of the boat lift.

10. A method of employing the boat lift of claim 5 , the method comprising:

altering a number of modular floats forming the pontoons to change the capacity of the boat lift.

11. A method of employing the boat lift of claim 5 , the method comprising:

altering a number of beam pieces forming the modular base structure to change the capacity of the boat lift.

12. A boat lift comprising:

a base structure;

a cradle connected with the base structure and configured to support a boat;

a plurality of pontoons connected with the base structure for floating the boat lift on a water surface, the pontoons including a plurality of modular floats; and

at least one parallelogram linkage for raising and lowering the cradle, the at least one parallelogram linkage connected with the base structure;

wherein the base structure includes a plurality of beam pieces, the beam pieces being attachable and detachable to make a modular base structure and

wherein the modular floats are movable forward and aft with respect to the cradle such that boats of varying centers of gravity are lifted levelly.

13. The boat lift of claim 12 wherein the at least one parallelogram linkage is made of a series of beam pieces such that the beam pieces of the parallelogram linkage are attachable and detachable to make at least one modular parallelogram linkage.

14. The boat lift of claim 13 wherein the at least one modular parallelogram linkage includes at least one aqueous hydraulic cylinder.

15. A method of employing the boat lift of claim 14 , the method comprising:

altering a number of the aqueous hydraulic cylinders coupled to the modular parallelogram linkage to change the capacity of the boat lift.

16. A method of employing the boat lift of claim 13 , the method comprising:

altering number of beam pieces to or from the modular parallelogram linkage to change the capacity of the boat lift.

17. A method of employing the boat lift of claim 12 , the method comprising:

moving forward and aft the modular floats forming the pontoons with respect to the cradle such that boats of varying centers of gravity can be lifted levelly.

18. A method of employing the boat lift of claim 12 , the method comprising:

altering a number of beam pieces to or from the modular base structure to change the capacity of the boat lift.