Patent ID: 7250753
Filing Date: 2007-07-31
Classification: F15B,G01D

Abstract:
1. A sensor attachment mechanism for a fluid pressure cylinder, wherein a position detecting sensor for sensing an operating position of a piston having a position detecting magnet is attached with a sensor holder to a grooved rail protruding from an outer surface of a cylinder tube along a length thereof, the position detecting sensor configured to detect the magnet; the sensor holder comprises a base mounted on the rail and a sensor holding part extending from the base, the sensor holding part being close to or in contact with a surface of the cylinder tube outside a rail wall of the grooved rail; the sensor holding part has a holding guide for holding the position detecting sensor in a predetermined attitude in a direction parallel to an axis line of the cylinder; the attitude of the position detecting sensor held by the holding guide is such that the position detecting sensor is directed to substantially a center of the fluid pressure cylinder to detect the magnet; the grooved rail on the outer surface of the cylinder tube includes a pair of parallel rail walls, each having a flange directed inward along an edge thereof; and the base of the sensor holder has a bolt hole through which an attachment bolt is screwed into a nut fitted in between the parallel rail walls and a fit protrusion fitted between the flanges of the rail walls to fix an attachment attitude of the sensor holder with respect to the rail.