Hydraulically operated grapple or timber fork
AssigneeKewaco AB
InventorKarl Erik Wallberg
Life of this patent
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Abstract
A hydraulically operated grapple or timber fork provided with a wire tightened on the load to prevent the load from disarranging and falling out of the fork. The wire tension is obtained by a hydraulically operated stretcher. In order to ensure that the wire stretcher in all positions can be supplied with hydraulic fluid under pressure, a pressure accumulator is positioned between a hydraulic pressure source and the hydraulically operated wire stretcher.
Claims6
A hydraulically operated grapple comprising an openable and closable fork, a hydraulic cylinder for operating said fork, a wire connected to said fork, a hydraulically operated wire stretcher coupled to said wire to stretch the same such that the wire can contact a load carried by the fork and prevent the load from disarranging and/or falling out of the fork, a hydraulic circuit connecting a hydraulic pressure source, said hydraulically operated wire stretcher and said hydraulic cylinder to effect operation of said stretcher conjointly with said cylinder, and pressure accumulator means in said circuit between said hydraulic pressure source and said hydraulically operated wire stretcher for being pressurized during operation of said cylinder for supplying the wire stretcher temporarily with pressure fluid if said pressure source is cut off.
Dependencies are inferred from the claim text.