EP 0296047 B1 19910403 - MULTI-STAGE ACTUATOR WITH AT LEAST THREE SLIDING ELEMENTS AND TELESCOPIC JIB INCORPORATING THIS ACTUATOR
Title (en)
MULTI-STAGE ACTUATOR WITH AT LEAST THREE SLIDING ELEMENTS AND TELESCOPIC JIB INCORPORATING THIS ACTUATOR
Publication
Application
Priority
FR 8708297 A 19870615
Abstract (en)
[origin: EP0296047A1] The invention relates to a multi-stage actuator with at least three elements mounted so as to slide relative to each other, comprising one first piston (4), slidably mounted in a first cylinder (1) where it defines a first large chamber (5) and a first small chamber (6); one second piston (9) slidably mounted in a second cylinder (7) integral with the first piston (4) where it delimits a second large chamber (10) and a second small chamber (11); one piston rod (12) fixed to the second piston (9); one first passage (13) providing permanent communication between the first small chamber (6) and the second large chamber (10); and two pipe couplings (20, 21) to two external pipes (28, 29) connected to a fluid delivery device (23) and a fluid outflow (22). The pipe couplings (20, 21) are placed on the piston rod (12); and the first large chamber (5) is connected to one (20) of the two pipe couplings by a first pipe (14) fixed to the first piston (4), leading to the first large chamber (5) and mounted for sealed telescopic sliding relative to a second pipe (16) fixed to the second piston (9), leading into the second large chamber (10) and positioned inside the piston rod (12), the second small chamber (11) being connected to the other pipe coupling (21) by a third pipe (18) formed in the piston rod (12) and leading into the second small chamber (11). One application is the construction of a telescopic crane jib. <IMAGE>
IPC 1-7
IPC 8 full level
B66C 23/70 (2006.01); F15B 15/16 (2006.01)
CPC (source: EP)
B66C 23/705 (2013.01); F15B 15/16 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0296047 A1 19881221; EP 0296047 B1 19910403; DE 3862246 D1 19910508; FR 2616489 A1 19881216
DOCDB simple family (application)
EP 88401457 A 19880614; DE 3862246 T 19880614; FR 8708297 A 19870615