EP 0908657 B1 20010523 - Pipe swaging device with hydraulic transmission
Title (en)
Pipe swaging device with hydraulic transmission
Title (de)
Rohrschmiedegerät mit hydraulischem Antrieb
Title (fr)
Machine à rétreindre de tuyaux à transmission hydraulique
Publication
Application
Priority
IT MI972312 A 19971013
Abstract (en)
[origin: EP0908657A1] A conventional swaging gripper (90) with two jaws (92) can be applied to the device (82) for swaging metal pipes (100). The closure movement of the jaws (92) which squeeze the pipe (100) is achieved by a hydraulic transmission comprising: a cylinder (44) within which a rod (52) is movable in both directions, one end of the rod emerging from the cylinder (44) through a suitable sealed aperture and to its other end there being coaxially fixed a sealed piston (54) which divides the interior of the cylinder (44) into a first chamber (42) and a second chamber (58) both containing an incompressible liquid, the outer end of the rod carrying means (80) for opening the jaws (92) of the pipe swaging gripper (90), applicable to the pipe swaging device (82), as a result of volume increase of the first chamber (42); a reservoir (34) also containing said incompressible liquid, the reservoir shell having a part (74) deformable elastically within a predetermined range as a result of variation in the liquid quantity within the reservoir (34); a plunger pump (30) to withdraw the liquid contained in the reservoir (34) and to feed it under pressure into the first chamber (42) of the cylinder (44) via a first conduit (36, 46, 48); a second conduit (72) which connects the second chamber (58) of the cylinder (44) to the reservoir (34); a third conduit (53) which connects the first chamber (42) to the reservoir (34) by by-passing the pump (30); manually operable shut-off means (51, 49) provided in the third conduit (53); and elastic return means (55) for returning the rod (52) into the position corresponding to minimum volume of the first chamber (42) of the cylinder (44) when the shut-off means (51, 49) in the third conduit (53) are open. <IMAGE>
IPC 1-7
IPC 8 full level
B21D 39/04 (2006.01); B25B 27/10 (2006.01)
CPC (source: EP)
B21D 39/04 (2013.01); B25B 27/10 (2013.01)
Designated contracting state (EPC)
AT DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0908657 A1 19990414; EP 0908657 B1 20010523; AT E201491 T1 20010615; DE 69800825 D1 20010628; DE 69800825 T2 20010927; ES 2157108 T3 20010801; IT 1295321 B1 19990504; IT MI972312 A1 19990413
DOCDB simple family (application)
EP 98118890 A 19981006; AT 98118890 T 19981006; DE 69800825 T 19981006; ES 98118890 T 19981006; IT MI972312 A 19971013