Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1996-01-22
1998-08-11
Graysay, Tamara L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
4052591, 411531, 411545, E21D 2100, F16B 4300
Patent
active
057918287
ABSTRACT:
A plate (1) for use in support of a mine roof comprising two interconnected parts (2, 3). The first part has a substantially frusto-conical projecting portion (6) which defines a first opening (7) and the second part (3) is fitted to the first part and has all associated second opening to allow for a rock bolt to pass through the plate. The two parts (2, 3) are interconnected by an interconnecting portion (20) of the second part, which is arranged through the opening (7) and is deformed such as by being swaged over to capture the projecting portion 6. The interconnecting portion is swaged over to form either a single continuous return portion (13) or individual return portions (23).
REFERENCES:
patent: 3090203 (1963-05-01), Durget
patent: 3133468 (1964-05-01), Cumming
patent: 4652178 (1987-03-01), Kates et al.
patent: 4708559 (1987-11-01), Locotos
patent: 5292209 (1994-03-01), Calandra, Jr. et al.
patent: 5385433 (1995-01-01), Calandra, Jr. et al.
patent: 5628587 (1997-05-01), Lesslie
Graysay Tamara L.
Lagman Frederick L.
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