| 摘要 |
A reach mechanism for use on a material handling device having a load support carriage such as an industrial lift truck and a load carrier. The reach mechanism has a rear mount attachable to the carriage, a front mount for supporting lift forks or the like, and an extensible linkage for longitudinal projection and retraction of the front mount relative to the rear mount. The linkage includes two laterally spaced set of links, each set having a first pair of upper and lower links pivoted at the lower ends thereof to the rear mount at spaced points and a second pair of upper and lower links pivoted at the lower ends thereof to the front mount at spaced points. The upper end of each of the first and second pair upper links are pivotally connected to the upper end of the second and first pair lower links respectively. Hydraulic power rams actuate the links to project and retract the front mount. At least one upper link is constructed in at least two pieces for articulation thereof between its upper and lower ends about a pivot connection intermediate the ends. The intermediate pivot connection is controlled so as to move through a predetermined path of travel which varies the effective length of the one upper link to cause the minimization of the nontravel transverse and/or tilting movement of the front mount. |
