(19)
(11) EP 0 104 080 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.09.1984 Bulletin 1984/36

(43) Date of publication A2:
28.03.1984 Bulletin 1984/13

(21) Application number: 83305514

(22) Date of filing: 20.09.1983
(84) Designated Contracting States:
AT CH DE FR GB LI SE

(30) Priority: 20.09.1982 GB 8226722

(71) Applicant: MINING DEVELOPMENTS LIMITED
 ()

(72) Inventor:
  • Butterworth, Philip
     ()

   


(54) Continuous flow positive displacement pumps


(57) A pumping device comprising two or more hydraulic cylinder arrangements, each comprising a double ended piston the ends of which alternately pump fluid from an outlet in a respective piston cylinder. The pump is powered by a common hydraulic fluid supply which supplies motive power to each of the hydraulic cylinder arrangements and the outlets of the piston cylinders are all connected to a common outlet. An hydraulic cylinder arrangement is caused to start progressively to pump as a second hydraulic cylinder arrangement progressively and in a manner inversely proportional to the first ceases to pump.






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