Importance

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Abstract

Novel motorized scaffold hoisting units are provided that are intended to be used in pairs with two jack poles. Each unit comprises a carriage that is adapted to be slidably disposed on a jack pole and has guide means that restrain the carriage from moving laterally while allowing it to be raised or lowered along the length of the pole. Each unit also comprises a hoist or winch that is mounted on a platform carried by the carriage and comprises a cable-carrying drum and a power transmission for rotating the drum in response to rotative power supplied by an auxiliary electrically powered driver. The outer end of the cable carried by the drum is adapted to be releasably attached to the upper end of a jack pole on which the unit is mounted. Each carriage also carries at least two fail-safe brake means for releasably gripping the pole on which the carriage is mounted, and means in the form of a laterally-projecting arm for supporting a scaffold, e.g., a wooden or aluminum plank. Each transmission is adapted to be driven by an electrically powered driver, e.g., a battery-powered electric drill fitted with a socket wrench that mates with the input shat of the power transmission.

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First Claim