Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1977-12-20
1978-10-03
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
E21D 1544
Patent
active
041176871
ABSTRACT:
A mine roof support comprises at least one hydraulically extensible chock leg connected at its upper end in articulated manner to a roof beam of the support, and connected at its lower end in articulated manner to a base member of the support, a pair of links each having bearing surfaces adapted either to embrace a common chock leg by bearing on opposite sides thereof or to bear on adjacent sides of a pair of spaced apart chock legs, one end of each link being pivotally attached to the base member at a pivot point located to one side of a diametral plane passing through the longitudinal axis of the chock leg on which the link bears, the other end of the link being located to the other side of that plane and being acted upon by a restoring ram adapted to displace the or each link about it or their respective pivot points, to restore the or each leg to its predetermined position upon release of the support from the roof, and also to resist tendency for the or each leg to become displaced from the predetermined position while the support is engaged with the roof, and stop means also mounted on the base member and engageable by the or each other link end to determine the maximum displacement of the or each link by the ram.
REFERENCES:
patent: 3309054 (1967-03-01), Davis-Ratcliffe
patent: 3530490 (1970-09-01), Ward et al.
patent: 3832856 (1974-09-01), Sigott et al.
patent: 4030308 (1977-06-01), Dudley et al.
Scarfe Arthur
Smith John Cambridge
Fletcher Sutcliffe Wild Limited
Taylor Dennis L.
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