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Pub. No.:    WO/1981/001346    International Application No.:    PCT/US1979/000969
Publication Date: 14.05.1981 International Filing Date: 08.11.1979
H03K 17/97 (2006.01)
Priority Data:
US79/00969 08.11.1979 WO
Abstract: front page image
(EN)Magnetic control apparatus (32) for intensifying a magnetic field to actuate a magnetic control member (34) and for preventing simultaneous actuation of a pair (34, 36) of magnetic control members. In one (32) of several embodiments a pair (38, 40) of selectively movable magnets each respectively produces a magnetic field which, when a magnet is moved into position, is directed by a pair (42, 54) of elongated bars across the pair (34, 36) of control members to actuate one of the members in response to the field. The pair (42, 54) of bars bypass the magnetic fields from the control members (34, 36) when both magnets (38, 40) are in such a position to attempt to actuate the control members (34, 36). The pair (42, 54) of elongated bars intensify the magnetic fields at the control members (34, 36), thereby permitting the use of relatively weak magnets at a substantial distance from the members (34, 36). The pair (42, 54) of bars also provide a magnetic interlock, preventing undesirable simultaneous actuation of the members (34, 36). The apparatus (32) can be used on a pedal (100) of a fork lift truck to actuate one member (34) to shift a transmission into forward drive and to actuate the other member (36) to shift the transmission into reverse drive. Also disclosed is magnetic control apparatus (10) to perform only the function of field intensification.
(FR)Dispositif de commande magnetique (32) destine a intensifier un champ magnetique pour actionner un organe (34) de commande magnetique et a empecher un actionnement simultane d"une paire (34, 36) d"organes de commande magnetique. Dans un (32) des modes de realisation, on dispose une paire (38, 40) d"aimants mobiles de maniere selective; chaque aimant produit respectivement un champ magnetique qui, lorsque l"aimant est mis en position, est dirige par une paire (42, 54) de barres allongees en travers de la paire (34, 36) d"organes de commande pour actionner un des organes en reponse au champ. La paire (42, 54) de barres contourne les champs magnetiques des organes de commande (34, 36) lorsque les deux aimants (38, 40) se trouvent dans une position telle qui pourrait actionner les organes de commande (34, 36). La paire (42, 54) de barres allongees intensifie les champs magnetiques appliques aux organes de commande (34, 36), ce qui permet d"utiliser des aimants relativement faibles a une distance considerable des organes (34, 36). La paire (42, 54) de barres permet aussi un enclenchement magnetique, empechant un actionnement simultane indesirable des organes (34, 36). Le dispositif (32) peut etre utilise dans la pedale (100) d"un chariot elevateur a fourche pour actionner un organe (34) de maniere qu"il enclenche l"entrainement de marche avant d"une transmission et pour actionner l"autre organe (36) d"une maniere qu"il enclenche l"entrainement de marche arriere de la transmission. Un dispositif (10) de commande magnetique destine a executer uniquement la fonction d"intensification du champ magnetique est aussi decrit.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)