公开(公告)号：US3790814A

公开(公告)日：1974-02-05

申请号：US3790814D

申请日：1972-06-06

Applicant: PFAFF & KENDALL

Inventor： PFAFF H ,  BOWSER W

IPC: B66C13/23 ,  B66C15/00 ,  H01H35/00

CPC classification number: B66C13/23 ,  Y10T307/786

Abstract: An electrical lowering apparatus, for lowering and elevating a mounted fixture, which is provided with braking means which secure the brake by coupling the brake directly to the moving means to prevent brake bypass in the event of mechanical or electrical failure and which engage the brake for the initial distance of lowering and for the final distance of elevating by correlating the tripping of the brake limit switch to movement of the moving means to cushion the separation and connection operations, which is further provided with electrical operating means which control the driving means by independently generating the control signal for the power circuit to prevent extraneous electrical interference and which control the braking means by separately operating the brake solenoid and the motor in the power circuit to prevent motor-generated current interference, and which is further provided with overriding means which bypass the driving means by enabling coupling of a shaped portion of the moving means to an external drive to provide continued operation of the apparatus in the event of electrical or mechanical failure.

Abstract translation: 一种用于降低和升高安装的固定装置的电气降低装置，其具有制动装置，所述制动装置通过将制动器直接连接到移动装置来固定制动器，以防止在机械或电气故障的情况下的制动旁路并且将制动器接合 通过将制动限位开关的跳闸与移动装置的移动相关联以缓和分离和连接操作，降低的最初距离和最后的升高距离，其进一步设置有电动操作装置，其通过独立地控制驱动装置 产生电源电路的控制信号以防止外部电气干扰，并且通过在电源电路中单独操作制动螺线管和电动机来控制制动装置，以防止电动机产生的电流干扰，并且进一步设置有旁路装置 该驱动装置通过使成形部分o能够联接 f移动装置到外部驱动器，以在电或机械故障的情况下提供装置的持续操作。