In rooms where low headroom is an issue, American Crane can provide you with Low Profile Built Up Hoisting Machinery up to 100 Ton capacities.
The Hoist Brake is a fail-safe, spring set, electrically released and totally enclosed disc type brake with a self-adjusting mechanism to automatically compensate for lining wear. It also includes unitized construction for easy disc replacement.
The Hoist Gearbox is a ductile cast iron fully enclosed gearbox, with hardened alloy steel planetary gearing, rigidly supported by heavy duty tapered roller bearings for high load capacity and long service life.
The Hoist Motor has a variable custom built vector motor with high temperature Class H insulation to ensure reliability, and oversized frames to ensure long life. The flange mounted ribbed frame construction is equipped with 100% copper conductors capable of 1000 to 1 speed range. Motor encoders are Mill Duty type with state-of-the art sensors that are unaffected by common contaminants. The encoder enclosure is made of ductile cast iron construction for ruggedness and dependability.
The Trolley Wheels are made of forged steel (per AISI 1070) rim toughened to 320 Brinell minimum per ASTM A 504. Wheels are mounted on high strength alloy steel rotating axles, and supported by spherical roller bearings to provide a minimum L10 life of 10,000 hours.
The Trolley Drive has a keyless shaft mounted, parallel helical gearing with integral motor and brake. Gears are manufactured from certified steel, heat treated to a case hardness of 58-62 Rockwell C, and finished ground or shaved to assure maximum mechanical efficiency.
The Trolley Frame is fabricated from steel plates and structural steel shapes to firmly support all machinery with minimal deflection for long service life. All welding is performed in-house in accordance with AWS D1.1 certified welders.
In the Lower Block, a fabricated steel housing supports ball bearing equipped steel sheaves. The forged steel hook features a minimum 5 to 1 design and is supported via a swiveling crosshead and roller type thrust bearing.
The rotary geared type Limit Switch is driven directly by the hoist drum to accurately control upper and lower position of the block. The switch features independently adjustable cams for precise control. A paddle type control circuit limit switch is also included.
The Drum features seamless tubing with machined left hand and right hand grooves (groove depth and pitch per CMAA 70 Specifications). The drum is supported with a "barrel" type coupling connected to the hoist gearbox, thereby avoiding a statically indeterminate loading condition. The opposite drum end is supported by a spherical roller bearing.