Apparatus for pulling in and letting out a cable

Details Apparatus for pulling in and letting out a cable Apparatus for pulling in and letting out a cable

1982-03-26

1984-05-15

Jillions, John M.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

254228, 254254, B66D 318

Patent

active

044483937

ABSTRACT:
An apparatus for hauling in and letting out a flexible element such as a cable comprises a generally stationary housing defining a cable path and having a predetermined number N equal to at least three of grippers spaced in a row and shiftable along the path. These grippers can be clamped on the element in the path by respective actuators which can displace the grippers parallel to the path in a pulling direction and in an opposite letting-out direction. A controller responsive to gripper position and connected to the actuators operates them sequentially. Thus all but one of the grippers is first clamped on the element and the one gripper is unclamped from the element. Then the clamping grippers are displaced by the respective actuators with the element in one direction at a rate V.sub.w through a distance S/(N-1) while simultaneously the nonclamping gripper is displaced oppositely through a distance S along the element at a rate V.sub.r equal substantially to 2.multidot.V.sub.w to return this nonclamping gripper to a starting position. Subsequently the nonclamping gripper is closed on the element and the one of the other grippers which follows in the row behind the gripper in the starting position is unclamped. These steps are then sequentially repeated so that the grippers are successively returned to the starting position in an operation cycle having N parts.

REFERENCES:
patent: 3266776 (1966-08-01), Catu
patent: 3602413 (1971-08-01), Reynard

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