“Adjustable Leg” or “Telescopic Leg” It is a very useful feature. When the crane is under no-loading, the leg can be extended to by 20% -40%of the original height, to make the whole gantry higher, therefore, the gantry crane will give a higher effective lifting height. This is much flexible than a fixed height gantry crane.
By 2 units of manual winches, the legs of the gantry can be extended easily. After the legs extending to a position, a pin should be insert into the leg. There are normally 3 points of extending, and each of them are 500-700mm inverval.
Screw driving is a electrical drives to extend the leg. The asending of the leg can be at “mm” scale and no-pin needed for lock the leg.
This is perfect for very confined place. In this case, the gantry can reach maximum height as much as possible, even touch the roof.