Sliding fork device

Abstract

The invention provides a sliding york which can process stretching movement swimmingly and reduce cost even if a carry object has heavy weight or stretching stroke. The sliding york apparatus (1) includes a fixing york (11), a middle york (21) supported to slide along length direction relative to the fixing york (11), and a front york (31) supported to slide along length direction relative to the middle york (21). A drive pinion driven by a rotary drive device (2) mounted on the fixing york (11) engages with a rack (22) mounted on the middle york (21) in the sliding york apparatus (1). All movable yorks (the middle york (21) and the front york (31)) are driven directly by the rotary drive device (2).

Description

technical field [0001] The present invention relates to improvements in slide fork arrangements for cargo transfer devices. Background technique [0002] The sliding fork device used for loading and unloading machinery such as conveyors, forklifts, and cranes to transfer goods has two or more movable forks that slide relative to non-sliding fixed forks, and is composed of a driving mechanism and a linkage mechanism , the drive mechanism is supported as a movable upper stage closest to the fixed fork that can slide in the length direction relative to the fixed fork (fixed frame F in patent document 1, and first-stage fork 31 in patent document 2). Fork (arm A1 in patent document 1, secondary fork 32 in patent document 2) is driven, and the linkage mechanism is to make the upper-level movable fork (in patent document 2) move as the movable fork slides. In 1, the arms A2 and A3, in patent document 2, the third-stage fork 33 and the fourth-stage fork 34) slide in the same direc...

AI Technical Summary

Problems solved by technology

[0005] Because in the composition of this existing sliding fork device, the upper movable fork (arm A1, secondary fork 32) closest to it is driven with respect to the fixed fork, and by being linked with the movement of the movable fork, The above-mentioned interlocking mechanism makes the upper movable fork (arm A2, third-stage fork 33) and the uppermost movable fork (arm A3, fourth-stage fork 34) telescopic. The driving force of the driving device makes the structure of sliding the uppermost movable fork more complicated, so the cost increases, and, especially in the case of heavy weight of the object to be transported or a large telescopic stroke, there is a problem that it cannot be carried out smoothly. The telescopic operation of the top-level movable fork (front end fork)

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