Hydraulic swivel drive for a grab
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United States of America Patent
Stats
-
Nov 11, 2008
Grant Date -
Jul 21, 2005
app pub date -
Dec 13, 2004
filing date -
Dec 11, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a hydraulic swivel drive for a grab which has two tong-like movable grab arms, in particular two-shell grabs, having two swivel shafts which are pivotally supported in a shell carrier, are parallel to one another and whose shaft ends can be connected to the grab arms, as well as a shaft drive piece which is displaceably supported parallel to the swivel shafts and is in screw engagement with both swivel shafts so that the swivel shafts are rotated in opposite directions by displacement of the shaft drive piece. In accordance with the invention, the swivel drive is characterized in that at least one hydraulically chargeable plunger piston is provided to displace the shaft drive piece.
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