Mine roof support unit and assembly

Details Mine roof support unit and assembly Mine roof support unit and assembly

1977-09-28

1978-10-24

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405299, E21D 1544

Patent

active

041214269

ABSTRACT:
A mine roof support unit comprises a floor sill, a roof cap, a goaf shield and hydraulic props supporting the roof cap above the floor sill. The goaf shield is pivotably connected to both the floor sill and the roof cap. The floor sill is provided with at least one auxiliary prop which is arranged to contact and support the roof cap only when the hydraulic props have been retracted by a predetermined amount.

REFERENCES:
patent: 3323771 (1967-06-01), Dowty
patent: 3347050 (1967-10-01), Dommann et al.
patent: 3418814 (1968-12-01), Groetschel
patent: 3898845 (1975-08-01), Plevak et al.
patent: 3928981 (1975-12-01), Parker et al.

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