EP 0578995 B1 19951213 - Pneumatic rotary actuator with increased starting torque
Title (en)
Pneumatic rotary actuator with increased starting torque
Title (de)
Pneumatischer Drehantrieb mit erhöhtem Anlaufmoment
Title (fr)
Vérin rotatif pneumatique avec un couple de démarrage amélioré
Publication
Application
Priority
IT MI921576 A 19920626
Abstract (en)
[origin: EP0578995A1] The pneumatic rotary actuator (10) comprises a barrel (11) and inside partitions (17, 18) defining an elongated main chamber (14) and at least one lateral chamber (15, 16) communicating with the main chamber (14) via axially aligned passages in said partitions (17, 18). A main double-acting piston (20) reciprocable inside the main chamber (14) has a threaded axial hole (20A), which engages with a thread shaft (21) rotatably supported axially protruding from one end of the actuator. A secondary piston (25, 26) inside each lateral chamber (15, 16) provides an additional thrust to the main piston (20) at the beginning of each reciprocating travel. Guide surface means inside the main chamber (14) prevent the main piston (20) from rotating; fluid under pressure sequentially supplied on corresponding sides of the main (20) and lateral piston or pistons (25, 26), causes the reciprocating movement of the main piston (20) and the consequent reciprocating rotation of the thread shaft (21) with an increased starting torque at the beginning of each travel. <IMAGE>
IPC 1-7
IPC 8 full level
F15B 15/08 (2006.01)
CPC (source: EP)
F15B 15/068 (2013.01)
Designated contracting state (EPC)
CH DE ES FR GB LI NL
DOCDB simple family (publication)
EP 0578995 A1 19940119; EP 0578995 B1 19951213; DE 69301012 D1 19960125; DE 69301012 T2 19960509; ES 2081164 T3 19960216; IT 1255184 B 19951020; IT MI921576 A0 19920626; IT MI921576 A1 19931226
DOCDB simple family (application)
EP 93109868 A 19930621; DE 69301012 T 19930621; ES 93109868 T 19930621; IT MI921576 A 19920626