Mine roof support plate

Description

FIG. 1 is a perspective view of a mine roof support plate showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view relative to FIG. 2.

FIG. 5 is a front view relative to FIG. 2;

FIG. 6 is a cross-sectional view taken in the direction of the arrows on line 6--6 of FIG. 2;

FIG. 7 is a cross-sectional view taken in the direction of the arrows on line 7--7 of FIG. 2;

The left side view is identical to the right side view, and the rear view is identical to the front view.

Referenced Cited
U.S. Patent Documents
D236428 August 1975 Stewart et al.
2854824 October 1958 Curry et al.
4095431 June 20, 1978 Hannan
4112693 September 12, 1978 Collin et al.
4371293 February 1, 1983 Wilcox et al.
4476660 October 16, 1984 Francovitch
4518282 May 21, 1985 Wilcox et al.
Other references
  • Brochure entitled: "Keeping the Roof Over Your Head", published by Keystone Bolt Company, Copyright 1979. Brochure entitled: "Tazewell Underground Roof Control Products and Services", published by Tazewell Industries (undated).
Patent History
Patent number: D301687
Type: Grant
Filed: Nov 13, 1985
Date of Patent: Jun 20, 1989
Inventors: Bruce A. Cassidy (Richmond, OH), James O. Gray (Rayland, OH)
Primary Examiner: B. J. Bullock
Law Firm: Fleit, Jacobson, Cohn & Price
Application Number: 6/805,102
Classifications
Current U.S. Class: D/8399; D/8353