Lifting units
Page 66
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Two units said to be ideal tools for garages and transport centres, where simple, portable mechanical devices for lifting and shifting duties are always in demand, have been introduced by Herbert Morris Ltd. The LitaLift pulley block can, it is claimed, withstand a very high degree of shock impact without suffering damage. Available in capacities of 1ton to 5 tons, LitaLift blocks are designed for use in situations where low weight and a small hook-to-hook dimension is required, Sealedfor-life bearings support the load shaft and a Grade 80 alloysteel load chain is employed to provide resistance to impact loading.
Where the block is used in conjunction with an overhead track or runway, the LitaLift can be built into the supporting trolley. Built-in LitaLift blocks are available in capacities up to 5 tons, the trolleys being suitable for use with I-section beams. A cam-actuated dry-disc load brake is applied automatically when the hand chain is released.
The LevaLift lever-action pull hoist has a gravity die cast body shell, while the main frame is a light, high-quality alloy, fully heat treated to produce a unit combining lightness with durability.
Where rapid unloaded hook movement is required, the chain can be pulled through in either direction independently of lever operation. An automatic catch ensures that this cannot happen when a load is on the hook.
The unit has top and bottom hooks; the top hook is fitted into a machined bore in the main casing and turns freely, while the bottom hook is supported in a ball thrust race to provide full 360deg rotation for accurate load positioning. The chain is of alloy steel to BS 3114 (Grade 80) specification and has a high tensile strength, together with resistance to impact loading.
There are no unguarded levers and triggers, the selection of "up", "down" and "free" being made by the turn of the button. The selection mechanism, operating in conjunction with the brake, permits the unit to be operated in a series of short strokes, the brake immediately supporting the load as the effort is removed and the return stroke commenced. Apart from periodic cleaning, the LevaLift requires no maintenance, all bearings being prelubricated.
The dry-type disc brake is cam actuated and so designed that the braking effort is proportional to the load on the hook. When lowering, it is said that the effort required to overcome the braking effect is maintained at a low level, and that the load is lowered under complete control.
The LevaLift is available in three capacities, namely 4-ton (750 kg), 1+-ton (1500 kg) and 3-ton (3000 kg). Hook-to-hook dimensions of standard LevaLift models range from 5ft 6in. (1.6m) to 6ft 3in. (1.9m). Longer chain lengths can be supplied on demand. Manufactured by: Herbert Morr Ltd, PO Box 7, Loughborougl Leicestershire.