Abstract: A parallel translation mechanism, when connected between a first element and a second element, maintains the relative direction between the two elements constant when one of those elements is moved relative to the other. The mechanism is in part formed by first and second rigid elongated members which are pivotally connected together and are pivotally connected by the end of the first elongated member to one of the elements. A first portion of an extendable member is connected between the one of the elements and the second elongated member, and a second portion is connected between the other element and the second elongated member. The other element is also pivotally connected to a position on the second elongated member. The three members of the mechanism are connected together in such a fashion that the described relative movement between the two elements is obtained. The mechanism has particular application to forklift vehicles.

Abstract: A load handling mast for lift trucks including an extensible assembly of three rail sections nested together and interconnected by load supporting chains and a hydraulic rising piston and cylinder ram mounted on the middle rail section. The chains are reeved over sheaves mounted on the ram piston rod and the rail sections to provide a four to one ratio of mast extension relative to piston rod extension. The full extension and retraction of the mast and the support of the load manipulated by the mast is effected entirely through the chains and hydraulic ram without the use of a latch system.