Hydraulic swivel drive for a grab

Details Hydraulic swivel drive for a grab Hydraulic swivel drive for a grab

2004-12-13

2008-11-11

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

Moving cylinder

C092S136000

Reexamination Certificate

active

07448312

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.

REFERENCES:
patent: 829279 (1906-08-01), Mears
patent: 2678519 (1954-05-01), Honiss
patent: 3192783 (1965-07-01), Cruzan
patent: 5651302 (1997-07-01), Mills
patent: 1864451 (1962-12-01), None
patent: 29621601 (1998-04-01), None
patent: 20107206 (2002-08-01), None

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