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Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
Throughout the 1930s and 1940s a wide range of fire engines, including articulated ladder trucks were made, with power coming mostly from Hercules or Waukesha engines. Pirsch first introduced aerial ladders in the 1930s, including the first fully powered 100–foot aerial ladder device in the United States in 1935.
The Roman Polyspaston crane, from Ancient Greek πολύσπαστον (polúspaston, “compound pulley”), when worked by four men at both sides of the winch, could lift 3000 kg. In case the winch was replaced by a treadwheel, the maximum load even doubled to 6000 kg at only half the crew, since the treadwheel possesses a much bigger ...
A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), although modern large hoists use alternating current drives that ...
mechanical levering device with hydraulic cylinders powered by a pump; used for forcible entry or spreading vehicle or structure parts to permit extrication of a victim. Also called Hurst Tool , which is a type that includes cutter and ram/jacking features.
His first motorized ladder truck was on a Rambler chassis, and this was followed by others based on Couple Gear, White, Duplex, Nash and Dodge. In 1926 came the first complete Peter Pirsch fire engines; these were 150 to 750 gpm pumpers, chemical and hose trucks powered by 6-cylinder Waukesha engines .
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The most basic type of derrick is controlled by three or four lines connected to the top of the mast, which allow it to both move laterally and cant up and down. To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. [1] [2]
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