Kelley Company, Inc.

Joe M Delgado

William B Weishar

A drive mechanism for an industrial door. A rotatable drive member is operably connected to the door and rotation of the drive member in one direction through operation of a motor will move the door to the closed position while rotation of the member in the opposite direction will move the door to the open position. A clutch mechanism interconnects the motor and the drive member and is movable between an engaged and disengaged position. The clutch mechanism is biased to the engaged position, and by manually pivoting an actuating member that is connected to the clutch mechanism, the clutch mechanism can be moved to the disengaged position, and is retained in the disengaged position until manually released. A switch is operably connected to the motor, and when the actuating member is pivoted to a position to disengage the clutch, the switch will be actuated to shut off power to the motor.

Drive mechanism for an industrial door

A roll-up door for enclosing a doorway in a building. The door comprises a horizontal rotatable drum mounted above the doorway and a flexible door panel is wound on the drum. A pair of first pulleys are secured to opposite ends of the drum and one end of a flat belt is secured to each first pulley, while the opposite end of each belt is dead-ended on a fixed object. A counterbalancing weight is attached to the belt intermediate its ends and exerts a counterbalancing force to wind door panel on the drum. A pair of second pulleys are secured to opposite ends of the drum and located adjacent the first pulleys. One end of a second flat belt is secured to each second pulley, while the opposite end of each second belt is connected to the lower end of the door panel. A drive member, such as a hydraulic motor, is operably connected to the drum and operation of the motor in one direction will unwind the door panel from the drum and move the door to a closed position, while operation of the motor in the opposite direction will wind the door panel on the drum to move the door panel to an open position. A resilient member of spring is connected to the second belt intermediate its ends and exerts a biasing force to stretch the door panel.

Roll-up door construction

A vertically stored dockboard. The dockboard includes a frame or supporting structure which is mounted on a loading dock and a rap or deck plate is hinged at its rear edge to the frame and is movable between a generally vertical storage position and a horizontal operating position where the ramp bridges the gap between the loading dock and a truck parked in front of the dock. The ramp is moved upwardly to the vertical storage position by a hydraulic cylinder mechanism and is locked in the storage position by a toggle assembly. As the ramp is moved upwardly to the vertical storage position, the toggle assembly will be automatically moved to an over-center position to lock the ramp in the storage position. The toggle assembly can be released by a manually operated toggle release arm to enable the ramp to fall by gravity to the horizontal storage position.

Growing community of inventors

Waukesha, WI, United States of America

Joe M Delgado