10.0 Beam trolleys should not be used on any beam other than those designed, tested and marked as a runway beam with exception that they may be used on a beam forming part of a structure where a specific design check has been made for this purpose and end stops or a suitable means of preventing the trolley running off the end of the beam have been fitted. The beam should also be sufficiently level under all loading conditions such that the trolley will not run away under gravity.
10.1 Beam trolleys are in the main, adjustable to suit specific range of beam widths. Adjustment is achieved by means of a screwed adjusting bar operated by turning the handle body.
10.2 There are two types of beam trolleys available, push travel (see fig. 10.1) and geared travel (see fig 10.2). Push travel trolleys are normally used for loads of up to 6000kg and linear movement is achieved by pushing against the load. Geared travel trolleys are preferred when loads in excess of 6000kg are to be handled or accurate positioning is required e.g. alignments of flanges, bolt holes etc.
10.3 The W.L.L. of the trolleys must be adequate to take the load to be lifted plus the weight of the hoist and the operating chain (where fitted) should be long enough to hang approximately 2 feet above the operating level must always be picked up, travelled and landed directly below the runway beam.