Patent ID: 8997629
Filing Date: 2015-04-07
Classification: G01D

Abstract:
1. A pneumatic actuator, comprising: a containment jacket ( a rolling membrane ( an activating bar ( elastic means ( a fixed part ( a mobile part ( the actuator being characterised in that the fixed part ( 23 ) also has at least a core ( 25 ) made of ferromagnetic material extending along the main axis of extension (X); and also being characterised in that it also comprises at least two magnets ( 29 ) fixed to the mobile part ( 26 ) and mounted on diametrically opposed sides relative to the main axis of extension (X) of the fixed part ( 23 ), said at least two magnets ( 29 ) having the same radial orientation of magnetic polarisation relative to the main axis of extension (X), said at least two magnets ( 29 ) being arranged so that their respective faces facing each other have the same polarity; also being characterised in that the mobile part ( 26 ) can move relative to the fixed part ( 23 ) between a first position of maximum magnetic uncoupling between the magnets ( 29 ) and the ferromagnetic core ( 25 ), and a second position of maximum magnetic coupling between the magnets ( 29 ) and the ferromagnetic core ( 25 ); and also being characterised in that it also comprises a sensor ( 30 ) for detecting a magnetic field mounted at one end of the ferromagnetic core ( 25 ), wherein the operating position of the activating bar ( 14 ) can be determined based on the magnetic field detected by the sensor ( 30 ).