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Definitions (20)
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end carriages
Located on either side of the span, the end carriages house the wheels on which the entire crane travels. These wheels ride on, or under the gantry beam, allowing access to the entire length of the bay.
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bridge girder(s)
The principal horizontal beam(s) of the Crane Bridge which supports the crab unit or hoist, and in turn, is supported by the end carriages.
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carriage
The unit consisting of both the hoist and the carriage frame. In situations where more than one hoist is required on one crane, hoists can be supplied on a single carriage or on separate carriages.
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crab
The crab carries the hoist across the bay along the double girder bridge, traversing the span. Again, one or more hoists can be used on one or more crabs.
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hoist
The hoist is mounted to the carriage or crab, and performs the actual lifting function via a hook or lifting attachment. There are two basic types of Hoist. The first is the Wire Rope Hoist which is generally for higher capacities (over 2 Tonnes) and faster lifting speeds.
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chain hoist
These hoists are less expensive and used for lower capacities (80Kg to 2000 Kg). They are often used on light runway systems and jib cranes.
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capacity/swl
The maximum weight the crane will be required to lift.
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span
The horizontal distance between the gantry rails.
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height of lift
The required distance from the floor to the crane hook in it’s uppermost position. This dimension is critical in most applications as it can determine the height of the gantry from the floor and is dependent on the clear inside height of the building.
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long travel
The rate at which the bridge or crab/carriage travels, or at which the hoist lifts, usually in metres per minute or mpm. You may specify either single speed or two speed travel/lift or a specific rate of speed, (i.e 40 & 10 mpm long travel).
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