Chair lift for boats

1. A chair lift comprising

a mast, a boom, a hydraulic gantry, and a chair;

wherein the chair lift is adapted for use in boats;

wherein the chair lift is adapted to transport people into and out of water;

wherein a winch is used to connect the chair to a boom pole;

wherein the mast comprises a base, a mast post, a bearing ring, a mast motor, a motor control, a first limit switch and a second limit switch;

wherein the boom comprises the boom pole, a boom slider and a boom swivel joint;

wherein the hydraulic gantry comprises a hydraulic cylinder and a gantry swivel joint;

wherein the chair comprises a seat;

wherein the mast post is further defined with a first end and a second end;

wherein the boom pole is a cylindrical pipe that is further defined with a third end and a fourth end;

wherein the hydraulic cylinder is further defined by a fifth end and a sixth end;

wherein the first end of the mast post is attached to the bearing ring;

wherein the third end of the boom pole is attached to the second end of the mast post using the boom swivel joint;

wherein the fifth end of the hydraulic cylinder is attached to the first end of the mast post using the gantry swivel joint;

wherein the base is a metal plate that is adapted to be mounted on the deck of the boat;

wherein the bearing ring is mounted on the base;

wherein the mast post is a hollow cylindrical pipe;

wherein the mast motor is an electric motor that is mounted inside the mast post and is adapted to connect to the boat's electrical system;

wherein the mast motor rotates the mast post around a center axis;

wherein the motor control sends a first signal to the mast motor to turn either clockwise or counter clockwise;

wherein the motor control sends a second signal to the mast motor to turn either clockwise or counter clockwise;

wherein the rotation of the mast post is limited by a first limit switch;

wherein the rotation of the mast post is limited by a second limit switch;

wherein when the mast post rotates to a first predetermined limit, the first limit switch closes to signal to the motor electronics to disconnect the motor;

wherein when the mast post rotates to a second predetermined limit, the second limit switch closes to signal to the motor electronics to disconnect the motor;

wherein the boom swivel joint is a device that allows the boom pole to rotate relative to the mast post;

wherein the boom pole houses a boom slider that is connected to the hydraulic gantry;

wherein the boom slider slider comprises a first slot, a second slot, a center shaft and a cradle;

wherein the first slot and the second slot are formed into the side of the boom pole;

wherein the first slot and the second slot are sized to allow the center shaft to fit through the first slot and the second slot;

wherein the center shaft is further defined with a seventh end and an eighth end;

wherein the cradle is attached to the seventh end and eighth end of the center shaft;

wherein the hydraulic cylinder is a mechanical device that moves a piston;

wherein the gantry swivel joint is a device that allows the hydraulic cylinder to rotate relative to the mast post;

wherein the piston moves in a unidirectional manner into and out of the sixth end of the hydraulic cylinder;

wherein the exposed end of the piston is attached to the cradle;

wherein the winch comprises a winch motor, a winch drum, a winch line;

wherein the winch is used to raise and lower the seat into the water;

wherein the motor control comprises an on off switch, a direction switch, a limit resistor a clockwise transistor, a counter clockwise transistor, a clockwise pullup resistor, and a counter clockwise pullup resistor;

wherein the motor control is adapted to use an external electric voltage provided by the boat's electrical system.

2. The chair lift according to claim 1 wherein

the on off switch is closed to connect the external electric voltage to the limit resistor, the counter clockwise pullup resistor, and the clockwise pullup resistor;

wherein the limit resistor is connected to the direction switch;

wherein the direction switch is used to route the current coming through the limit resistor to a base connection of the clockwise transistor;

wherein the direction switch is used to route the current coming through the limit resistor to the base connection of the counter clockwise transistor;

wherein an emitter of the clockwise transistor is connected to an electrical ground;

wherein the emitter of the counter clockwise transistor is connected to the electrical ground;

wherein the first limit switch and the second limit switch is connected between the limit resistor and the direction switch;

wherein the first limit switch and the second limit switch is connected to the electrical ground.