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US 4,226,405 AGranted
Mechanical safety device for a winch
OwnerGuy S. R. Roodtinventor
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OwnerGuy S. R. Roodtinventor
Estimating the term…
The invention relates to a safety device for winch-type apparatus for moving loads. Two longitudinal elements containing a winch between them are connected by a first transverse element on which two telescopic sleeves are pivotably mounted. A calibrated spring is received in each pivotable sleeve. A second transverse element also connects the two longitudinal elements. The second transverse element supports the sleeves and a yoke of a guide pulley for a cable to be wound and unwound from the winch. The tension in the cable causes the springs to pivot the yoke thereby preventing excessive tension on the cable when a load drawn by the winch encounters resistance and preventing excessive unwinding of the cable when the load is interrupted in its descent. The safety device can be used in all winch-type apparatus, and in particular in hoisting apparatus with telescopic ladders for building sites.
A safety device for a winch having a rotatable drum on which cable means are arranged to be wound and unwound, the safety device comprising two spaced longitudinal elements between which said drum is arranged, each said longitudinal element extending away from the drum in the same direction, a first transverse element connecting the longitudinal elements, at least one telescopic sleeve pivotably mounted on said first transverse element, a calibrated spring being received within said telescopic sleeve, a second transverse element connecting the longitudinal elements, a yoke pivotably mounted on said second transverse element, a guide pulley for the cable means carried by said yoke, and an articulated linking member coupling said yoke to said telescopic sleeve and arranged to transmit to said sleeve the force exerted on the yoke by the tension of said cable means such that, when the tension of said cable means exceeds a predetermined value the spring causes the yoke to pivot.
A safety device for a winch, the winch having a rotatable drum on which cable means are arranged to be wound and unwound, drive means for rotating the drum, gear means for connecting the drive means to rotate the drum, and a gear lever for selectively controlling the gear means, the safety device comprising two spaced longitudinal elements between which said drum is arranged, each said longitudinal element extending away from the drum in the same direction, a first transverse element connecting said longitudinal elements, a set of telescopic sleeves pivotably carried by said first transverse element, calibrated springs being received in said telescopic sleeves, a second transverse element connecting said longitudinal elements, a yoke pivotably mounted on said second transverse element, a guide pulley for the cable means carried by said yoke, and an articulated linking member coupling said yoke to said telescopic sleeves and arranged to transmit to said sleeves the force exerted on the yoke by the tension of said cable means such that, when the tension of said cable means exceeds a first predetermined value for falls below a second predetermined value the springs caused the yoke to pivot.
Dependencies are inferred from the claim text.