Importance

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Abstract

Free-lift of a lift truck carriage is desirable without extension of the uprights, along with the capability to extend the carriage above the uprights, all while retaining clear forward vision and a rigid mast structure. Herein, relatively movable mast members (14a,14b) are shorter than relatively fixed mast members (12a,12b), the sheaves (28a,28b) are affixed to the movable members (14a,14b), the chains (30a,30b) are attached to the carriage (16) over the sheaves (28a, 28b) and to the relatively fixed members (12a,12b), while the jacks (24a,24b) act between the relatively fixed (12a,12b) and movable (14a,14a) members. Slide bars (44a,44b) are movably mounted to the relatively movable members (14a,14b) and to the carriage (16). A structure (50) is provided for preventing further linear movement of the slide bars (44a,44b) relative to the relatively movable mast members (14a,14b) while allowing further linear movement of the carriage (16) relative to the slide bars (44a,44b), as the jacks (24a,24b) extending beyond a selected length.

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First Claim