Patent CA-1132494-A (CA)
Inventor: BARTOW RICHARD J
IPC: B66F9/08
Filed: 1980-03-27
Granted: 1982-09-28
Abstract: UPRIGHT FOR LIFT TRUCK        Abstract A lift truck upright having a fixed upright section, a telescopic upright section, and a load carrier mounted on the latter section. An asymmetric lift cylinder assembly is located adjacent one side of the upright in a position which provides improved overall operator visibility through the upright. The lift cylinder is adapted to be operatively connected to the telescopic upright section by means of a pair of lifting chains. One of the chains is reeved on a pair of spaced and rotationally aligned sprockets supported either from the lift cylinder assembly and from the fixed upright section, or from the opposite ends of a transverse bar structure which is supported from the cylinder assembly. In either embodiment the one chain traverses the upright and is fixedly secured at one end at one side of the cylinder assembly and at the other end to the remote side of the telescopic section of the upright. The second chain is adapted to be reeved on a sprocket mounted from either the upper end of the lift cylinder assembly of from said transverse bar structure, the one chain end thereof being fixedly secured on the same one side of the lift cylinder as is the first chain, and the other end being secured to the near of adjacent side of the telescopic section. A second centrally mounted cantilevered cylinder is mounted centrally of the telescopic upright section for elevating thereon the lifting carriage to a full free-lift position. Both cylinder assemblies are preferably one-half the effective height of the upright  when it is in a collapsed condition for elevating the respective upright elements to  which they  are connected at a 2:1 movement  ration with the asymmetric cylinder being supported from the one fixed upright section rail at one side of the upright such that it projects at least partially into the area of interference by the adjacent vertical rail with the visibility of the operator from his normal line of sight through said adjacent vertical rail, and preferably is located at least partially in the longitudinal plane of the side of the upright such that it projects the latter cylinder being supported at an elevated position in relation to the bottom of the fixed upright section.     A fluid pressure supply hose is connected between the base ends of thetwo cylinder assemblies and is reeved from the top of the asymmetric cylinder for elevation therewith and with said first chain. Another aspect of the invention involves the location of the asymmetric cylinder and sprockets, and of chains reeved thereon, as between the fixed and telescopic upright sections of FIGS,1-4. In this subcombination of the invention a first chain is reeved on first, second and third rotationally aligned sprockets which are spaced transversely of the upright, the first sprocket being mounted from the lifting end of the asymmetric cylinder assembly and the second and third sprockets being mounted from the upper end portion of the fixed upright section. A second chain is reeved on a fourth sprocket side-by-side with the first sprocket. One end of each chain is secured adjacent an outer one side of the cylinder assembly while the other ends of the chains are secured to the telescopic section adjacent the opposite sides thereof and substantially equidistant from the longitudinal central vertical plane of the telescopic section, the cylinder being located at least partially in the longitudinal plane of the one side of the upright.                      -0'-