Hydraulic-powered screw-driven paint sprayer

Claim 2

A screw-driven coating applicator for applying a coating to a workpiece and comprising a base, a frame mounted on said base, said frame including a pair of spaced generally parallel rails, a threaded shaft carried by said frame and located between and generally parallel with said rails, a reversible fluid motor drivingly connected to said shaft, distributoR valve means connected to said fluid motor and adapted to direct fluid under pressure to said motor for causing rotation of the same in a desired direction, means supplying fluid under pressure to said distributor valve means and said fluid motor, a carriage slidably mounted on said rails, means on said carriage engageable with said shaft for causing said carriage to move along the same, cam means extending outwardly from said carriage, spaced limit switch means adapted to be alternately engaged by said cam means, said limit switch means being connected to said distributor valve means for moving said distributor valve means alternately and reversing the flow of fluid to said fluid motor means, at least one applicator head carried by said carriage, means for supplying coating material to said applicator head, control valve means carried by said applicator head for controlling the flow of coating material, and means carried by said limit switch means for operating said control valve means and interrupting the flow of material to said applicator head when said limit switch means is operated.

Claim 3

The structure of claim 1 including an adjustable relief valve for controlling the speed of rotation of said fluid motor.

Claim 4

The structure of claim 1 in which said frame is disposed in generally vertical position and said limit switch means are adjustably mounted on a generally vertical carrier bar.

Claim 5

The structure of claim 1 including a bypass regulator for controlling the fluid pressure within the system.

Claim 6

The structure of claim 1 including damper means located between said distributor valve and said fluid motor for absorbing shock when the motor is reversed.

Claim 7

A fluid-powered screw-driven paint sprayer for applying paint to a workpiece and comprising a base, a frame mounted on said base and disposed in a generally vertical plane, said frame including a pair of spaced generally parallel rails, a screw-threaded shaft rotatably mounted on said frame, pinion gear means fixed to one end of said shaft, a drive gear meshing with said pinion gear, hydraulic motor means for driving said drive gear, a fluid pump carried by said base and adapted to supply fluid under pressure to said hydraulic motor means, distributor valve means located between said pump and said motor means and adapted to direct fluid under pressure alternately to opposite sides of said hydraulic motor to operate said motor means in reverse directions, a carriage mounted on said rails and threadedly engaging said shaft so that rotation of said shaft in one direction will move the carriage up the rails and rotation of the shaft in the other direction will move the carriage down the rails, a pair of spaced limit switches mounted on said frame, cam means mounted on said carriage and adapted to engage said limit switches at the end of travel of said carriage, said limit switches being connected to operate said distributor valve means and reverse the direction of rotation of said shaft when a limit switch is engaged, at least one applicator head mounted on said carriage, means for supplying coating material under pressure to said applicator heads, and means for controlling the supply of material to said head subject to the operation of said limit switches.

Claim 8

A fluid-powered screw-driven paint sprayer for applying paint to a workpiece and comprising a base, a frame mounted on said base and disposed in a generally vertical plane, said frame including a pair of spaced generally parallel rails, a screw-threaded shaft rotatably mounted on said frame, pinion gear means fixed to one end of said shaft, a drive gear meshing with said pinion gear, hydraulic motor means for driving said drive gear, a fluid pump carried by said base and adapted to supply fluid under pressure to said hydraulic motor means, distributor valve means located between said pump and said motor means and adapted to direct fluid under pressure alternately to opposite sides of said hydraulic motor to operate said motor means in reverse directions, a carriage mounted on said rails and threadedly engaging said shaft so that rotation of said shaft in one direction will move the carriage up the rails and rotation of the shaft in the other direction will move the carriage down the rails, a pair of spaced limit switches mounted on said frame, cam means mounted on said carriage and adapted to engage said limit switches at the end of travel of said carriage, said limit switches being connected to operate said distributor valve means and reverse the direction of rotation of said shaft when a limit switch is engaged, at least one applicator head mounted on said carriage, means for supplying coating material under pressure to said applicator heads, and means for controlling the supply of material to said head subject to the operation of said limit switches.