Swashplate pump
AssigneeWagner Spray Tech Corporation
InventorsRobert D. Cooper, Scott R. Carpenter
Life of this patent
Estimating the term…
Abstract
A piston pump assembly with a rotatingly driven swashplate in driving relationship with a rocker arm and piston engaged with one end of the rocker arm. A spring urges the rocker arm and piston into contact with an annular ring carried by a bearing in the swashplate. The spring may be a separate leaf spring or may be formed integrally with the rocker arm. The rocker arm engagement with the piston uses a spherical ball-joint-like surface. The contact between each of the rocker arm and piston and the annular ring utilize spherical surfaces on the rocker arm and piston, with an elongated footprint on the rocker arm and a circular footprint on the piston. The piston is allowed a slight radial play in operation.
Claims27
A piston pump assembly for pumping paint and similar liquid coatings comprising
- a. a source of rotary power;
- b. a swashplate connected for rotation to the source of rotary power;
- c. a rocker arm in direct contact with the swashplate and arranged to reciprocate in a rocking motion as the swashplate rotates;
- and
- d. one and only one piston in contact with the swashplate and connected to the rocker arm and arranged to reciprocate by action of the swashplate driving the piston in a first direction and by action of the rocker arm returning the piston in a second direction opposite to the first direction.
A piston pump assembly for pumping paint and similar liquid coatings comprising
- a. a source of rotary power;
- b. a swashplate assembly connected for rotation to the source of rotary power;
- c. a rocker arm in contact with the swashplate and arranged to reciprocate in a rocking motion as the swashplate rotates;
- and
- d. a piston in contact with the swashplate and connected to the rocker arm and arranged to reciprocate by action of the swashplate driving the piston in a first direction and by action of the rocker arm returning the piston in a second direction opposite to the first direction
- wherein the swashplate assembly includes a swashplate base and an annular plate contacting both the rocker arm and the piston in diametrically opposed regions;
- and
- wherein the rocker arm has a dome located at one of the diametrically opposed regions.
A piston pump assembly for pumping paint and similar liquid coatings comprising
- a. a source of rotary power;
- b. a swashplate connected for rotation to the source of rotary power;
- c. a rocker arm in contact with the swashplate and arranged to reciprocate in a rocking motion as the swashplate rotates;
- and
- d. a piston in contact with the swashplate and connected to the rocker arm and arranged to reciprocate by action of the swashplate driving the piston in a first direction and by action of the rocker arm returning the piston in a second direction opposite to the first direction
- wherein the piston has
- i. a ball-joint-like surface with a generally spherical radius profile and
- ii. a main cylindrical body with a cone shaped surface spaced apart from and facing the ball-joint-like surface;
- and
- wherein the rocker arm has a fork extending around the ball-joint-like surface of the piston and
- wherein the swashplate has a predetermined profile angle between an axis of rotation and a plane of a drive surface of the swashplate and the cone shaped surface of the piston has a cone angle substantially equal to the profile angle of the swashplate.
A piston pump assembly for pumping paint and similar liquid coatings comprising
- a. a source of rotary power;
- b. a swashplate connected for rotation to the source of rotary power;
- c. a rocker arm in contact with the swashplate and arranged to reciprocate in a rocking motion as the swashplate rotates;
- d. a piston in contact with the swashplate and connected to the rocker arm and arranged to reciprocate by action of the swashplate driving the piston in a first direction and by action of the rocker arm returning the piston in a second direction opposite to the first direction;
- and
- e. a spring acting against the rocker arm to urge the rocker arm and piston toward the swashplate
- wherein the spring is a leaf spring separate from the rocker arm.
Dependencies are inferred from the claim text.