(19)
(11) EP 0 255 336 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.05.1988 Bulletin 1988/18

(43) Date of publication A2:
03.02.1988 Bulletin 1988/05

(21) Application number: 87306650

(22) Date of filing: 28.07.1987
(84) Designated Contracting States:
BE CH DE FR IT LI SE

(30) Priority: 29.07.1986 CA 514904

(71) Applicant: C-I-L Inc.
 ()

(72) Inventor:
  • Marz, Horst Fritz
     ()

   


(54) Rotary displacement pump


(57) A rotary, positive displacement progressing cavity pump comprising a stator (4), a rotor (5) within the stator, an inlet and outlet in the stator and a drive shaft (6) connected to the rotor, the drive shaft-to-rotor connection (12,13) comprising a heat-sensitive, breakaway bond (14) of a heat-fusible metal alloy in an amount to provide a metchanical linkage between the drive shaft and the rotor, the metal alloy being meltable upon the generation of heat within the pump cavity and so disconnect the mechanical linkage.







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