Patent ID: 7494110
Filing Date: 2009-02-24
Classification: B62H,B66D

Abstract:
1. An arrangement for a failsafe vertical raising and lowering an object from a lower on the ground position to an above ground, elevated position over the head of the operator, said arrangement comprising an operating device mounted near the elevated position and above the head of the operator, said operating device comprising a fixed bracket adapted to be mounted adjacent the elevated position, a short vertical shaft extending a short distance adjacent said elevated position and above the operator, said vertical shaft having and being mounted for rotation around a vertical axis in the bracket, a horizontal reel above and directly affixed to the vertical shaft and rotating about said vertical axis, a pair of lines affixed to and wound about said reel at one end and two free ends extending from said reel first in generally horizontal direction, a pair of spaced pulley means for changing the free ends of respective lines from a generally horizontal direction to a generally downward direction, with said free ends being capable of being extended near the lower ground position and adapted for attachment to the object the to be raised and lowered, a long vertical rod means operatively but removably connected to a lower end of said vertical shaft for direct rotation of said shaft and said directly affixed reel in either rotary direction to wind on or wind off the pair of lines from said reel for raising or lowering said object, crank means on the lower portion of said rod for rotation of the same, said vertical shaft and directly affixed reel by said operator, said crank means providing mechanical advantage to lift said object, said object being raised to an elevated position when said rod means is rotated by said crank means about its axis in a first direction, and said object being lowered upon rotation of the rod means in the opposite direction, said long rod means extending downwardly from said short vertical shaft for manual operation by said individual operator, said rod means being attachable and detachable from said shaft to create clearance between said device and raised object and the ground to permit a human to pass below, and automatic lock means associated with said shaft and reel for releasably locking said shaft and reel in at least said elevated position, said automatic lock means being biased toward a locking position, said automatic lock means being released upon exertion of a force on said shaft means by said operator on said rod means to permit said operator to turn said crank means in one or the other direction to raise or lower said object.