Control system for selective positioning of a displaceable...

B - Operations – Transporting – 66 – F

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B66F 9/22 (2006.01) B66F 9/075 (2006.01) G05D 3/12 (2006.01)

Patent

CA 1036987

Control System for Selective Positioning of a Displaceable Device. ABSTRACT A control system is disclosed for selective positioning a displaceable device, in particular the load carrying fork cage of a so-called fork-lift truck, into pre-selected positions or heights. The control system includes spaced apart pairs of associated switch elements, one element of each pair being mounted on a stationary guide, and the other element on the displaceable device. Each element pair defines one of the pre-selectable positions when the two elements are aligned, and in that ease they further assume an actuated condition. Each element pair is connected in series with a particular selector switch, and when both the selector switch and the element pair are in an actuated condition, a coupling device is ener- gized to cancel or reduce the load carrying ability. The displaceable device then sinks until the two elements of the actuated pair are separated, whereafter the displace- able device is kept stationary in a well defined position or height. The control system is semi-automatic, very simple and well-suited for mounting on already existing fork-lift trucks.

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