Lift cylinder assembly

Details Lift cylinder assembly Lift cylinder assembly

2006-01-31

2006-01-31

Kreck, John (Department: 3673)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S299000

Reexamination Certificate

active

06991407

ABSTRACT:
A lift cylinder arrangement is disclosed for a hydraulic support frame for underground mining. The support frame has a lift cylinder for lifting the base shoes during advancing, which is supported on the one hand on a return rod and on the other hand, in a pivoting manner, with an end supporting head to a drawbar connected to the base shoes. In order to allow a simple, rapid and reliable connection between the supporting head and the drawbar, the supporting head is connected to the drawbar by a plug-type locking system comprising two plug-type locking elements, which include first locking notches on the drawbar, and arranged complementarily thereto second locking notches on the supporting head, whereby the plug-type locking elements engage in at least one of the locking notches with clearance.

REFERENCES:
patent: 3397012 (1968-08-01), Krekeler
patent: 3767234 (1973-10-01), Weirich et al.
patent: 5039257 (1991-08-01), Bithell
patent: 5961254 (1999-10-01), Friedrichs
patent: 4214690 (1993-11-01), None
patent: 19633847 (1999-05-01), None
patent: 1104428 (1968-02-01), None

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