Patent ID: 6220143
Filing Date: 2001-04-24
Classification: B23B

Abstract:
A rotary cylinder device comprising:a cylinder unit having a distributor support member and a piston chamber therein, and a piston axially slidably fitted in the piston chamber;a distributor supported for rotation on a support part of the distributor support member;a housing defining an annular draining space and provided with a side wall defining a bore closely receiving the distributor therein;a detaining mechanism for restraining the distributor from rotation relative to the housing, said detaining mechanism including a protrusion provided for the housing and a recess provided in the distributor and tightly receiving the protrusion, said protrusion being adapted to be forced to move out of the recess to allow the rotation of the distributor relative to the housing when a torque exceeding a threshold torque is exerted on the distributor; anda seizure detecting system for detecting the rotation of the distributor together with the cylinder unit due to seizure, said seizure detecting system including:a detecting member slidably received in said housing for radial movement relative to the housing and associated with said protrusion such that the detecting member will be moved radially outward when said protrusion is forced to move out of the recess, anda detection signal generating means for detecting the radial movement of the detecting member and generating a detection signal upon the detection of the radially outward movement of the detecting member.