Roof bar for surface support elements

Details Roof bar for surface support elements Roof bar for surface support elements

1976-06-03

1978-06-06

Taylor, Dennis L.

E21D 1544

Patent

active

040928314

ABSTRACT:
A roof bar for surface support elements having an L-shaped gap sealing plate which is fixed to at least one side of the roof bar and displaceable toward an adjacent roof bar. The vertical section of the roof bar is formed as a buffer plate for engaging a pivoted hydraulic cylinder supported on the roof bar. A horizontal section of the gap sealing plate is held in a guide below the top plate of the roof bar.

REFERENCES:
patent: 3376707 (1968-04-01), Dommann
patent: 3728863 (1973-04-01), Hidasi
patent: 3739586 (1973-06-01), Wehner et al.
patent: 3837170 (1974-09-01), Martinko et al.
patent: 3903703 (1975-09-01), Lubojatsky
patent: 3911686 (1975-10-01), Becker et al.

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