Fluid pressure rotary vane actuator

Claim 1

A FLUID PRESSURE ROTARY VANE ACTUATOR COMPRISING A BODY HAVING A CIRCULAR CHAMBER, A SHAFT DISPOSED AXIALLY OF SAID CHAMBER, A VANE CARRIED BY SAID SHAFT, SLIDING FLUID SEAL MEANS INTERMEDIATE THE VANE AND CHAMBER BODY, AN ABUTMENT FIXED WITHIN THE CHAMBER PROVIDING A FLUID BARRIER BETWEEN ONE SIDE OF THE VANE AND THE OTHER, FLUID PASSAGES THROUGH THE BODY COMMUNICATING WITH THE CHAMBER ON EACH SIDE OF THE ABUTMENT, STOP BLOCKS ON EACH SIDE OF THE FIXED ABUTMENT FOR LIMITING MOVEMENT OF THE VANE TOWARD THE ABUTMENT, SAID BLOCKS HAVING ADJUSTABLE MEANS INTERPOSED BETWEEN BLOCKS AND ABUTMENT TO PROVIDE PREDETERMINED LIMITS OF MOTION OF THE VANE WITHIN THE CHAMBER, FLUID PASSAGES IN THE STOP BLOCKS COMMUNICATING WITH THE CHAMBER ON THE VANE SIDE OF THE STOP BLOCKS, SAID PASSAGE COMMUNICATING WITH THE FLUID PASSAGES THROUGH THE BODY OVER THE RANGE OF ADJUSTMENT OF THE STOP BLOCKS WITHIN THE CHAMBER, AND RESILIENT SEALING MEANS SURROUNDING THE FLUID PASSAGES ON THE VANE SIDE OF THE STOP BLOCKS, SAID SEALING MEANS BEING ENGAGED BY THE VANE TO SEAL THE FLUID PASSAGE IN SAID STOP BLOCK WHEN THE VANE IS IN LIMIT POSITION AGAINST SAID STOP BLOCK.