EP 0143238 B1 19870805 - THREE-POSITION ACTUATING CYLINDER
Title (en)
THREE-POSITION ACTUATING CYLINDER
Publication
Application
Priority
DE 3337969 A 19831019
Abstract (en)
[origin: EP0143238A1] 1. Three-position working cylinder having the following features : a) a first piston (16) equipped with a sealing ring (13) is provided, by means of which the cylinder (4) is divided into a first pressure-medium chamber (3) and a second pressure-medium chamber (17) which is arranged on the other side of the piston (16) relative to the first pressure-medium chamber (3) ; b) there is provided a second piston (8), in the form of an annular piston, which is sealed with respect to the inner wall of the cylinder and with respect to an outer surface of the first piston (16) ; c) there is provided a stop (47) which is fixed to the housing and limits the traval of the second piston (8) ; d) on at least one of the two pistons (16, 8) there is provided a stop (12) which limits the sliding movement of the two pistons (16, 8) towards one another ; e) a space (41) located between the two pistons (16, 8), which are guided in sealed manner, can be connected to the atmosphere via a recess (45) arranged in the cylinder housing (4) ; f) the first pressure-medium chamber (3) and the second pressure-medium chamber (17) can each be charged with air and vented by means of a valve arrangement (28, 30, 23, 24) ; characterised by the following features : g) the venting outlets of the valve arrangement (28, 30, 23, 24) are connected to the space (41) bounded by the two pistons (16, 8) ; h) there is provided a third valve arrangement (42, 43) serving as a discharge value, via which the space (41) can be connected to the atmosphere when a pressure exceeding atmospheric pressure builds up in the space (41), and which moves into the closed position when the pressure in the space (41) has fallen to such an extent that the closing force of the valve arrangement (42, 43) exceeds the force of the pressure in the space (41).
IPC 1-7
IPC 8 full level
F15B 11/12 (2006.01)
CPC (source: EP)
F15B 11/006 (2013.01); F15B 11/123 (2013.01)
Designated contracting state (EPC)
AT DE FR GB NL SE
DOCDB simple family (publication)
EP 0143238 A1 19850605; EP 0143238 B1 19870805; AT E28763 T1 19870815; DE 3337969 A1 19850502; DE 3337969 C2 19920716; DE 3465210 D1 19870910
DOCDB simple family (application)
EP 84111140 A 19840919; AT 84111140 T 19840919; DE 3337969 A 19831019; DE 3465210 T 19840919