Device for keeping constant the tensile stress in a cable
OwnerDirk J. C. Lubinventor
Life of this patent
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Abstract
A device for keeping constant the tensile stress in a cable, comprises two guide pulleys for the cable spaced from each other and disposed in a common plane. A plurality of pulleys are disposed between the two guide pulleys in that same plane and are secured to a piston-cylinder unit that exerts a substantially constant force on those pulleys. The guide pulleys and the cable are movable relative to each other so that these intermediate pulleys can be moved out of engagement with the cable. The guide pulleys are also mounted on a frame that is movable perpendicular to that plane.
Claims6
Device for keeping constant the tensile stress in a cable or the like, comprising two guide pulleys for the cable disposed in one plane at a distance from each other and at least one pulley disposed between the two said guide pulleys and in the same plane, said at least one pulley being secured to a piston-cylinder unit in such a manner than an essentially constant force is exerted upon the pulley owing to the interior of the cylinder communication with an hydraulic system for the purpose of maintaining an essentially constant hydraulic pressure within the cylinder, the intermediate pulley in the operative position guiding the cable from the one guide pulley to the other while forming a loop, characterized in that means are provided to move the guide pulleys and the cable with respect to each other and that the piston-cylinder unit is constructed in such a manner that the intermediate pulley can be moved out of engagement with the cable, the guide pulleys being mounted on a frame mounted for movement perpendicularly to the plane of the pulleys and the piston-cylinder unit with the intermediate pulley being likewise mounted on said frame.
Dependencies are inferred from the claim text.