Title: Advance mechanism for a mine roof support unit

Abstract: A roof support unit has a pair of spaced floor girders and an advance mechanism comprising a hydraulic advance ram and a pair of relay rods connected, at one end, to a head-piece which is attached to a longwall conveyor. The other ends of the relay rods are attached to a guide element which is slidably guided by a pair of guide rails attached to the mutually-facing sides of the floor girders. The hydraulic advance ram is pivotally attached to the guide element and to the floor girders. Means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurized.

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Inventors: Wojaczek, Egon (Hamm-Bockum-Hoevel, DE)
Soliman, Mustafa (Lunen, DE)
Schulte, Juergen (Hamm, DE)

Application Number: 06/185638
Filing Date: 1980-09-09
Publication_date: 1983-04-12
Assignee: Gewerk, Eisenhuette Westfalia (DE)

Primary Class(es): 405/299 405/291
Other Classes: E21D23/04; E21D23/08; E21D23/00; E21D23/08
US Patent Ref:

3925995	December, 1975	Harmsma	405/299
3991580	November, 1976	Allen	405/299
4028898	June, 1977	Blumenthal	405/299
4075857	February, 1978	Elsner et al.	405/296
4217067	August, 1980	Lagodka et al.	405/299
4227833	October, 1980	Plester et al.	405/299
4231685	November, 1980	Rosenberg et al.	405/296

Other Refs:
Primary Examiner: Corbin, David H.
Assistant Examiner:
Attorney: Sughrue, Mion Zinn Macpeak And Seas

Claims: