| 摘要 |
A lift truck upright having a fixed upright section, a telescopic upright section, and a load carrier mounted on the telescopic section. A pair of main lift cylinder assemblies are located adjacent opposite sides of the upright, and a second pair of relatively short free-lift cylinder assemblies are located inwardly adjacent the main lift cylinders, the pairs of lift cylinders are mounted from the fixed upright section and are hydraulically connected in parallel, and of such relative size that the free-lift cylinders and main cylinders always actuate in the proper sequence to first elevate the load carrier in free-lift and then the load carrier with the telescopic section. Maximum fork height is attained following travel of the load carrier until it contacts stops at the top of the telescopic section, whereupon continued pressure supplied to the pairs of cylinders causes extension of the free-lift cylinders to transfer hydraulic fluid to the main cylinders to aid further extension of the telescopic section until the main cylinders have traveled full stroke. The upright is designed such that the free-lift cylinders are readily interchangeable with fixed anchor rods for applications in uprights in which the free-lift feature is not required. These cylinders and the associated hydraulic components can be readily provided as a kit for interchangeability in the field. A high visibility upright is thus provided in a design which provides substantial free-lift and which is readily interchangeable with an upright having little or no free-lift.
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