EP 0179793 B1 19871202 - HYDRAULIC PISTON PUMP FOR PUMPING LIQUIDS
Title (en)
HYDRAULIC PISTON PUMP FOR PUMPING LIQUIDS
Publication
Application
Priority
SE 8401969 A 19840409
Abstract (en)
[origin: WO8504691A1] The pump has a first pumping means (1) to be immersed into the liquid that is to be pumped, and a second means, driving pumping means (2), adapted to drive the first pumping means. The driving pumping means has a cylinder chamber (7) which, via a conduit, for instance a bendable hose (3), communicates with the first pumping means. The cylinder chamber (7) has two mutually displacable pistons (9, 12) which, when subjected to a predetermined mutual displacement, allows liquid to flow from the cylinder chamber (7) to a discharge outlet (6) on the pump. The outer piston (9) is sealed against the cylinder chamber (7), whereas the inner piston (12) seals against the outer piston (9) only via a circular edge (20) thereon. The lower pumping means (1) has a main piston (39) which can be urged downwardly by the pistons (9, 12) in the driving pumping means against the action of a spring (41). When the pressure from the pistons in the driving pumping means ceases, the main piston will, by means of said spring (41), urge liquid up through the hose (3) and the cylinder chamber (7) to the discharge outlet.
IPC 1-7
IPC 8 full level
F04B 47/04 (2006.01); F04B 47/12 (2006.01)
IPC 8 main group level
F04B (2006.01)
CPC (source: EP)
F04B 47/04 (2013.01); F04B 47/12 (2013.01)
Citation (examination)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 8504691 A1 19851024; DE 3561110 D1 19880114; DK 564285 A 19851205; DK 564285 D0 19851205; EP 0179793 A1 19860507; EP 0179793 B1 19871202; NO 157875 B 19880222; NO 157875 C 19880601; NO 854946 L 19851209; SE 439807 B 19850701; SE 8401969 D0 19840409
DOCDB simple family (application)
SE 8500151 W 19850401; DE 3561110 T 19850401; DK 564285 A 19851205; EP 85901662 A 19850401; NO 854946 A 19851209; SE 8401969 A 19840409