E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
85/31
E21D 21/00 (2006.01)
Patent
CA 1314416
Abstract Of The Disclosure A mine roof expansion anchor having a pair of radially expansible shell members, a tapered camming plug for movement down the threads of a roof bolt to effect such expansion, and a bail unit for maintaining the shell members and plug in assembled relation prior to installation and cooperable with the terminal end of the bolt to ensure proper operation of the anchor. The bail includes a pair of legs respectively affixed at one end to opposite sides of the shell structure and integrally joined at their opposite ends to a medial portion positioned over the plug. The medial portion includes a circular, embossed area concentrically surrounded by an unembossed area. The embossed area extends away from the plug and includes a central portion having a planar inner surface normal to the axis of a bolt threadedly engaged in a central bore in the plug, and an annular, radiused wall portion joining the central, embossed portion with the surrounding, unembossed area. A pair of ties are provided on the lower surface of the embossed area, extending over the radiused wall at diametrically opposite points, preferably adjacent the juncture of the legs and the medial portion, to establish the strength of the bond of the embossed and unembossed areas. The diameter where the central portion of the embossed area meets the radiused wall portion is slightly smaller than the minor diameter of the bolt (at the root of the threads), and the diameter where the radiused wall meets the unembossed portion is slightly greater than the major diameter (at the crest of the threads).
614023
Eastern Company (the)
Macrae & Co.
LandOfFree
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