E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 20/00 (2006.01) E21B 7/02 (2006.01) E21B 15/04 (2006.01) F15B 9/16 (2006.01) F15B 13/06 (2006.01)
Patent
CA 2218674
The arrangement comprises a pressure medium cylinder (2) provided with two cylinder spaces (2a, 2b) and two pistons (3a, 3b), and a control valve (12). The control valve (12) can be placed in at least three control positions but in only one at a time. In each control position, the pressure fluid is arranged to affect both cylinder spaces (2a, 2b) of the cylinder (2) such that in the control position concerned, the pistons (3a, 3b) always settle in a certain predefined position.
Le dispositif comprend un cylindre (2) pour milieu sous pression composé de deux espaces de cylindre (2a, 2b) et de deux pistons (3a, 3b) ainsi que d'un clapet de commande (12). Le clapet de commande (12) peut occuper au moins trois positions de commande, mais une seule à la fois. Dans chaque position de commande, le fluide de pression est positionné de façon à affecter les deux espaces (2a, 2b) du cylindre (2), afin que dans la position de commande concernée, les pistons (3a, 3b) se retrouvent toujours dans une certaine position prédéfinie.
Huttunen Mikko
Launiemi Markku
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Tamrock Oy
LandOfFree
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