B - Operations – Transporting – 60 – P
Patent
B - Operations, Transporting
60
P
B60P 1/00 (2006.01) A61G 3/06 (2006.01) B60P 1/44 (2006.01) F15B 11/028 (2006.01) F15B 20/00 (2006.01)
Patent
CA 2347680
The present invention incorporates a fluid pressure sensing switch (18) in fluid communication with a hydraulic fluid outlet (12) of a hydraulic pump (10) driving a platform lift (4). The pressure switch is calibrated to activate at a pump outlet pressure created when the pump attempts to fold the platform into the stow position when it carries a load. The switch is calibrated not to activate at a pump outlet pressure created when the pump attempts to fold the platform into the stow position when the platform is unloaded. Activation of the pressure switch disables the hydraulic pump, thereby preventing a loaded platform from being folded into the stow position.
Selon un mode de réalisation préféré, la présente invention concerne un manocontact hydraulique en communication fluidique avec la sortie d'une pompe hydraulique alimentant un appareil à plate-forme de levage. Ce manocontact est étalonné pour s'enclencher sous une pression de sortie déterminée de la pompe en cas de commande de rappel en position verticale de rangement de la plate-forme sous charge. A l'inverse, ce manocontact est étalonné pour ne pas s'enclencher sous une pression de sortie déterminée de la pompe en cas de commande de rappel en position verticale de rangement de la plate-forme à vide. L'actionnement du manocontact rend la pompe hydraulique inopérante, ce qui empêche de replier la plate-forme en position de rangement sous charge.
Hermanson Jeffrey J.
Pierrou James R.
Smart & Biggar
The Braun Corporation
LandOfFree
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