US 5,511,695 AGranted

Paint colorant dispenser

AssigneeHero Industries, Inc.

InventorsJulian-Y.-P. Chia, Gary B. Jenne

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Abstract

The dispenser provides for accurate and easily repeatable dispensation of selected volumes of paint colorant. The dispenser has an adjustable stop for limiting the travel of a piston in a paint colorant metering pump. The stop position can be adjusted in equally spaced increments by a coarse adjustment which includes a pin which may be engaged in equally spaced holes in a stop support member. The stop position can be adjusted to intermediate positions by a fine adjustment. The fine adjustment includes a threaded stop member mounted in a threaded aperture. The pitch of the threads on the stop member is such that the stop moves a distance of one increment in a single rotation of the stop member. The stop member may be turned by a knob. The knob is slidably mounted so that it does not move axially with the stop member and has a limited rotation so that each position of the knob corresponds to only one stop position.

Claims20

Dependent claims

A paint colorant dispenser comprising:

a piston sealingly and slidably mounted in a cylinder having first and second ends and an axis;
a stop contacting member on said piston, and apparatus for adjusting the position of a stop for regulating the volume of paint colorant dispensed by the paint colorant dispenser, said apparatus comprising:
a) a stop member comprising a central threaded portion, and a first end having a stop surface, said stop surface axially aligned with said stop contacting member;
b) a stop support member slidably mounted with respect to said cylinder, said stop support member having a mounting portion at one end thereof, said stop member passing through a threaded aperture in said mounting portion, with said threaded portion of said stop member engaged with said threads of said aperture;
c) coarse adjustment means associated with said stop support member for fixing said stop support member in one of a plurality of positions equally spaced apart by a distance L along a line parallel to said axis of said cylinder;
d) a knob associated with said stop member for rotating said stop member in said aperture;
wherein said threads have a pitch such that in one rotation of said stop member, said stop surface moves by a distance of at least L along said line.

4 more elements

A paint colorant dispenser comprising:

a. a cylinder comprising a tube and a valve body closing a lower end of said tube;
b. a valve in said valve body, said valve having a first position wherein said cylinder is in fluid communication with a reservoir and a second position wherein said cylinder is in fluid communication with an outlet;
c. a piston slidably and sealingly mounted within said cylinder;
d. a piston rod connected to said piston, said piston rod comprising a stop contacting surface;
e. a stop support member slidably mounted with respect to said cylinder,
f. coarse stop adjustment means for temporarily fixing said stop support member in one of a plurality of positions equally spaced apart by a distance L, said coarse stop adjustment means comprising:
i. a plurality of indentations in said stop support member;
ii. a sliding pin selectively engageable in one of said indentations;
iii. a spring for urging said sliding pin into said one of said indentations;
and,
iv. a linkage associated with said sliding pin for selectively retracting said sliding pin;
g. fine adjustment means mounted to said stop support member, said fine adjustment means comprising:
i. a stop mounting plate on said stop support member, said stop mounting plate comprising a threaded aperture axially aligned with said stop contacting surface;
ii. a stop member comprising a central threaded portion engaged in said threaded aperture, and a lower stop surface;
iii. a knob on said stop member for turning said stop member in said aperture;
iv. means for restricting rotation of said stop member and said knob to an angular range, said angular range being no more than one full rotation;
wherein said threads on said stop member have a pitch such that in rotating said stop member through said angular range, said stop surface moves by a distance of at least L along a line parallel to said axis.

14 more elements

Dependencies are inferred from the claim text.