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US 4,309,023 AGranted
Suspension apparatus for a scaffold
AssigneesPlumettaz SA, Gebr. Kupfer
InventorsGerard Plumettaz, Joe Kupfer
Life of this patent
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AssigneesPlumettaz SA, Gebr. Kupfer
InventorsGerard Plumettaz, Joe Kupfer
Estimating the term…
Apparatus for suspending a scaffold or the like, used for working on the outer walls of buildings, comprising a capstan made up of four pairs of pulleys driven by an electric motor. The pulleys have grooves for receiving suspension cables, each of which is wound over a pair of pulleys in five turns. On the slack-portion side, each cable is guided over a traverse mechanism, then runs onto a reel mounted via friction couplings on a shaft. This shaft is driven by the motor when the scaffold is raised, while during the descent it is locked by a monodirectional coupling, a driving wheel then being free on the shaft. A safety release device intended to intervene in case of lessening of the tractive force yielded by the friction couplings is combined with the traverse mechanism. If the tension of the slack portion of cable drops below a given threshold, a safety release cuts off the current supply to the motor and actuates an electromagnetic brake.
Apparatus for suspending a scaffold or the like, comprising a frame, one or more cables supporting said scaffold, a support to which said cables are connected, a winch made up of one or more pairs of grooved pulleys having parallel axes, a motor having a shaft coupled to said winch for rotating all of said pulleys in the same direction, each of said cables being wound several times over a respective one of said pairs of pulleys and having on one side a taut portion running to said scaffold or to said support and on the other side a slack portion, means for keeping said slack portion under tension, means for monitoring the tension of said slack portion, and winch-locking means connected to said monitoring means, said monitoring means causing said winch locking means to forcibly lock said winch if said slack portion tension falls below a predetermined threshold.
Apparatus for suspending a scaffold or the like, comprising a frame, one or more cables supporting said scaffold, a support to which said cables are connected, a winch made up of one or more pairs of grooved pulleys having parallel axes, a motor having a shaft coupled to said winch for rotating all of said pulleys in the same direction, each of said cables being wound several times over a respective one of said pairs of pulleys and having on one side a taut portion running to said scaffold or to said support and on the other side a slack portion, means for keeping said slack portion under tension, a drive shaft and one or more reels mounted on said drive shaft and respectively associated with each of said cables, one end of each said slack portion being attached to a respective reel and said slack portion being wound thereon in several layers when said scaffold is raised, each of said reels being driven in the same direction as said pulleys by said motor when said scaffold is raised and by the traction exerted by said winch when said scaffold is lowered, means for monitoring the tension of each said slack portion, and winch-locking means connected to said monitoring means, said monitoring means causing said winch locking means to forcibly lock said winch if the tension of said slack portion falls below a predetermined threshold.
Dependencies are inferred from the claim text.