Spline pumping assembly
First Claim
1. A piston assembly of a fluid pump mechanism comprising:
- a convex member having a central shaft and a convex upper surface, such convex upper surface being defined by a plurality of splines which extend outward from the central shaft for a predefined distance; and
a concave member having a collar a concave upper surface and a passage extending through the concave member, such concave upper surface being defined by a plurality of ribs which extend inwardly from the collar and terminate at a predefined location which defines the passage, wherein in an operational state the central shaft is movably received within the passage and the plurality of splines are movable interposed between the plurality of ribs.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a piston assembly for use in a fluid delivery system. The piston assembly is comprised of two elements: a splined-piston having generally a convex shape and a ribbed-base, that receives the piston, which has a complementary concave shape. The interposition of the splines and ribs and the complementary shaping of the two elements permit: a constant supporting surface area to be realized throughout a pumping cycle; the establishment of a constant supporting surface that readily and fully supports a thin, flexible material such that the material cannot not likely become stretched, unsupported or bound within the pumping mechanism throughout the pumping cycle; and the establishment of a relationship between the piston and its associated pumping chamber that enables a precise volumetric quantity to be delivered consistently and accurately.
-
Citations
20 Claims
-
1. A piston assembly of a fluid pump mechanism comprising:
-
a convex member having a central shaft and a convex upper surface, such convex upper surface being defined by a plurality of splines which extend outward from the central shaft for a predefined distance; and a concave member having a collar a concave upper surface and a passage extending through the concave member, such concave upper surface being defined by a plurality of ribs which extend inwardly from the collar and terminate at a predefined location which defines the passage, wherein in an operational state the central shaft is movably received within the passage and the plurality of splines are movable interposed between the plurality of ribs. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A piston assembly of a pump mechanism, comprising:
-
(a) a piston having a cylindrical hub and a plurality of splines extending radially outward therefrom, each spline having a first height at the cylindrical hub and a lesser height at a perimeter of the piston thereby creating a first angular displacement along each spline; and (b) a base having a cylindrical collar with a plurality of ribs extending radially inward toward a longitudinal axis of the collar, wherein the plurality of ribs terminate at a point short of the longitudinal axis by a predefined distance thereby creating a passage extending through the base, each rib having a first height at the cylindrical collar and a lesser height at the point where each rib terminates, thereby creating a second angular displacement along each rib, wherein, the passage of the base operatively receives the cylindrical hub of the piston and the plurality of splines are operatively interposed between the plurality of ribs. - View Dependent Claims (7, 8, 9, 10, 11)
-
-
12. A piston assembly of a pump mechanism comprising:
-
(a) a base having a cylindrical collar with a cylindrical bore and a concave upper surface, the concave upper surface being defined by a plurality of ribs that transverse the bore, each rib being parallel to another; and (b) a piston having a base means and a convex upper surface, the convex upper surface being defined by a plurality of splines that extend upward from the base means, each spline being parallel to another and spaced to be operatively received between the plurality of ribs.
-
-
13. A pump mechanism, comprising:
-
a fluid inlet; a fluid outlet; and at least one fluid pumping chamber, positioned between and in fluid communication with the fluid inlet and the fluid outlet, each fluid pumping chamber including; a convex member having a central shaft and a convex upper surface, such convex upper surface being defined by a plurality of splines which extend outward from the central shaft for a predefined distance; and a concave member having a collar, a concave upper surface and a passage extending through the concave member, such concave upper surface being defined by a plurality of ribs which extend inwardly from the collar and terminate at a predefined location which defines the passage, wherein in the central shaft is movably received within the passage and the plurality of splines are movable interposed between the plurality of ribs. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification