Dispensing pump having no check valves

Details Dispensing pump having no check valves Dispensing pump having no check valves

1977-04-29

1979-02-13

Tollberg, Stanley H.

Dispensing

Processes of dispensing

222321, 222340, 417489, B67D 542

Patent

active

041391225

ABSTRACT:
A dispensing pump having no check valves includes upper and lower mechanically-joined pistons which are moveable together through respective upper and lower cylinders. As the pistons are moved in one direction toward a rest position the cylinders are initially pressure-isolated and the upper piston aspirates spray liquid into the upper cylinder while the lower piston aspirates air into the lower cylinder. Before reaching the rest position the pistons unblock flow communication between the cylinders to permit liquid from the upper cylinder to fall into the lower cylinder. During movement of the pistons in the opposite direction the cylinders are again pressure-isolated and the lower piston forces liquid from the lower cylinder through a spray outlet under high pressure.

REFERENCES:
patent: 173167 (1876-02-01), Griswold
patent: 299068 (1884-05-01), Griswold
patent: 503232 (1893-08-01), Franklin
patent: 1175060 (1916-03-01), Hibschman
patent: 3159317 (1964-12-01), Mini
patent: 3749289 (1973-07-01), Levy
patent: 3768734 (1973-10-01), Anderson, Jr. et al.

Affiliated with

Also associated with

Rating

Dispensing pump having no check valves does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dispensing pump having no check valves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dispensing pump having no check valves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-687442