![]() The mainline collectors are mounted on the bridge to transmit current form the runway conductors, and the trolley collectors are mounted on the trolley to transmit current from the bridge conductors. Collectors:Ĭontacting devices for collecting current from the runway or bridge conductors. Indicator appearing adjacent to the CSA mark signifies that the industrial control equipment meets U.S. Crane, as an entire assembly, must be CSA certified. CMAA:Ĭrane Manufacturers Association of America. Minimum distance from the extremity of a crane to the nearest obstruction. The maximum rated load which a crane is designed to handle. The slight upward vertical curve given to girders to compensate partially for deflection due to hook load and dead weight of the crane. Bumper (Buffer)Īn energy absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel, or when two moving cranes or trolleys come into contact. The rail supported by the bridge girders on which the trolley travels. The electrical conductors located along the bridge structure of a crane to provide power to the trolley and hoisting machineries. That part of an overhead crane consisting of girders, end trucks, end ties, walkway and rive mechanism which carries the trolley and travels in a direction parallel to the runway. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). Brake:Ī device, other than a motor, that stops or pauses motion by power or friction. The rectangular cross section of girders, end trucks or other members enclosed on four sides. Boom (Gantry Crane):Ī trolley runway extension often used to obtain clearance for gantry travel by retracting or raising. Boom (Overhead Crane):Ī horizontal member used to permit hoisting as well as lowering the load at a point other than directly under the hoist drum or trolley, it is mounted on the trolley. ![]() BHN:īrinell hardness number, measurement of material hardness. ![]() The average expected life of the bearing is approximately five times the L-10 life. The L-10 life of an anti-friction bearing is the minimum expected life, hours of 90% of a group of bearings which are operating at a given speed and loading. Auxiliary Girder (Outrigger):Ī girder arranged parallel to the main girder for supporting the platform, motor base, operator’s cab, control panels, etc., to reduce the torsional forces such a load would otherwise impose on the main girder. Auxiliary Hoist:Ī backup hoisting unit usually designed to handle lighter loads at a higher speed than the main hoist. Automatic Crane:Ī crane which, when activated, operates through a preset cycle or cycles. Adjustable or Variable Voltage:Ī method of control by which the motor supply voltage can be adjusted. Environmental conditions that are unfavorable, harmful or detrimental to or for the operation of a crane or hoist conditions such as excessively high or low temperatures, corrosive fumes, dust laden or moisture laden atmospheres and hazardous locations. ![]()
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