E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/46
E21D 21/00 (2006.01) E02D 5/80 (2006.01)
Patent
CA 2029113
The invention relates to mechanical expansion anchors for support of roof bolts in pre-drilled holes in a mine roof. The anchors are of the type having two pairs of leaf members wherein the members of each pair are integrally connected to one another by bridge portions adjacent their lower ends, and the two pairs are physically attached by a bail member having two legs fixedly attached at their terminal ends to outer surfaces of the bridge portions. A tapered camming plug moves downwardly to effect shell expansion without physically interfering with internal surfaces of the leaf members as the latter are caused to fully expand. The cooperative expansion shell and tapered camming plug are so configured on their respective inner and outer surfaces that the likelihood of malfunction is minimized.
oquilles d'expansion mécanique pour le soutènement des boulons d'ancrage dans les trous préforés d'un toit de mine. Les coquilles sont du type à deux paires d'ailettes où les éléments de chaque paire sont connectés intégralement à leur extrémité par des ponts adjacents, et les deux paires sont attachées par une noix à deux pattes fixées à leur extrémité à la surface extérieure des ponts. Un bouchon de came effilé descend pour forcer l'expansion de la coquille sans toucher aux surfaces internes des ailettes qui doivent s'ouvrir entièrement. Les surfaces internes et externes de la coquille d'expansion et du bouchon de came fuselé sont conçues afin de minimiser les risques de fonctionnement défectueux.
Clark Carl A.
Wright Raymond L.
Eastern Company (the)
Macrae & Co.
LandOfFree
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