| 摘要 |
A manual "joystick" control unit for controlling an invalid chair, has a drive coil 1 carried on a fixed support 2 and surrounded by symmetrically arranged pick-up coils 20. Drive coil 1 is supplied with a current of sinusoidal or triangular wave form and the coupling between coils 1 & 20 is determined by the angular displacement of a magnetic armature plate 17 on joystick lever 24, which is supported for universal tilting movement by a helical spring 12 & freely rotatable about its axis. Coils 20 have pole pins 22 with flat coplanar end faces & coil 1 has a pole piece 7. Lever movement is limited by roller 32 engaging stop lip 31 in plate 29 fixed to housing 4. Diametrically opposite pairs of coils 20 are connected to comparators. <IMAGE> |
