Pumps – Expansible chamber type – Valved piston
Patent
1995-02-21
1997-04-15
Thorpe, Timothy
Pumps
Expansible chamber type
Valved piston
4175551, 417437, 92162P, F04B 5312, F04B 3914, F04B 3300
Patent
active
056203144
ABSTRACT:
A hand-operated, portable, easily-manufactured liquid pump offering efficiency through advanced plunger design, ease of repairability, and enhanced versatility through use of a select group of inlet and outlet accessories. The pump preferably includes a cylindrical housing, a bottom end forming an inlet port, and a top end with an exhaust port located near the top end. A field-repairable plunger assembly having a plunger which is preferably a rubber diaphragm is located within the cylindrical housing and is connected to a rod and handle for reciprocating the plunger within the housing. A unidirectional flow device is operatively connected to the bottom end of the housing to allow fluids to flow in a direction from the inlet port toward the exhaust port while preventing fluid flow in the opposite direction. The pump may be constructed to allow disassembly from the bottom end or the top end to allow a user to service the pump in the field and to replace worn or failing components. The pump housing and rod volumes are preferably selected to provide efficient ergonomic pumping action on both upstroke and downstroke movement. The plunger mechanism may include an enlarged cup member connected to the rod above the plunger to relieve a significant portion of the pressure applied by the column of liquid in the housing to the plunger during upstroke movement. A variety of plunger and pump rod designs are also discussed.
REFERENCES:
patent: D314039 (1991-01-01), Manchester et al.
patent: 695492 (1902-03-01), Robertson
patent: 793523 (1905-06-01), Helsel
patent: 2883939 (1959-04-01), Russell
patent: 2915986 (1959-12-01), Sisson
patent: 3006282 (1961-10-01), Sisson
patent: 3131646 (1964-05-01), Parrott
patent: 3669575 (1972-06-01), Beckerer
Packaging Literature for Han-D-Pump, Copy of Box and technical literature.
Brochure entitled "Chugger" by Chugger Pumps.
Brochure entitled "Industrial Hand Pumps & Accessories" by Beckson Industrial Products.
One-page Advertisement for "The Hog" from Kuranda USA, Annapolis, Maryland, dated Oct., 1993.
Thorpe Timothy
Wicker William
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