R&M Materials Handling ELECTRIC CHAIN HOISTS LoadMate Chain Hoist General Operation Manual - Manual (Page 14)

Electric Chain Hoist Operator’s Manual/EN/11.30.10
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Trolley Mounted
Trolley mounted hoists are hook mounted or lug mounted hoists suspended from a trolley; or a hoist
having an integral trolley as part of the hoist frame, that allows travel motion on the lower flange of a
monorail beam, or the lower flange of the bridge beam of an overhead crane.
Trolleys allow traverse motion of the hoist unit, and load being handled, by traveling: on the lower flange
of a monorail beam; on the lower flange of a bridge beam of an overhead crane; or on top of the bridge
beams of an overhead crane. Hoist trolleys are available in several types depending on the method
used to obtain travel motion. Trolley types include:
Plain (Push) Trolleys
Plain type trolley motion is obtained by pulling or pushing the load or by some other means,
such as the strain relief of a pendant control, suspended from the trolley or hoist. Plain type
trolleys are recommended where trolley motion is infrequent or relatively short. Because of the
force required to manually operate this type of trolley, it is recommended that the use of plain
trolleys be limited to a maximum capacity load of 3 tons or 3000 kg, and that the elevation of the
beam where the trolley is suspended be not more than 20 feet or 6 m above the operating floor
level.
Hand Chain Operated (Hand Geared) Trolleys
Hand geared trolley motion is achieved by grasping and pulling a continuous hand chain that is
connected to the trolley. Hand chain consists of a series of interwoven formed welded or un-
welded links according to the design specifications of the hand chain. The hand chain links fit
pockets of the trolley hand chain wheel, or sprocket. As the operator pulls the hand chain, the
hand chain wheel turns and transmits power through gearing to the trolley wheels. Pulling the
hand chain in one direction will cause the trolley to travel in the opposite direction. Hand chain
manually operated trolleys provide excellent load spotting ability.
Electric Powered (Motorized) Trolleys
Motorized trolley motion is achieved by activating a control device in the same manner as
described under electric powered hoists. The control device used to lift and lower hoist motion
may also contain controls for trolley travel. Recommendations for use of electric powered are
based on frequency of operation, distance of travel, capacity of load, height of beam, and type
or size of load being handled.