E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/67
E21D 15/44 (2006.01) E21D 23/04 (2006.01)
Patent
CA 1069714
ABSTRACT OF THE DISCLOSURE: A mine roof support comprises a plurality of hydraulically extensible chock legs articulated at upper ends to one or more roof beams and at lower ends to one or more base members, a shield pivotally connected to a rearward part of the base member and also pivotally connected to a rearward part of the roof beam with a permanently loaded force applying means reacting via the shield on the roof beam, in such a manner that the force applying means resists displacement of the roof beam and, upon a sufficient fall in pressure in the chock legs, restores any displaced chock legs to a predetermined position.
300310
Bower Lewis R.
Wake Malcolm
LandOfFree
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