Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Reexamination Certificate
2002-12-19
2004-09-28
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Advance causing or controlling means
Motor causes or controls advance
C173S004000, C173S011000, C173S033000, C173S036000, C173S037000
Reexamination Certificate
active
06796388
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to machines for drilling holes for roof bolts in mines, and more particularly, to such machines that insure that the roof bolt is secured in the mine roof at its proper depth.
Throughout this specification the words “roof bolt” and derivations of these words are taken to include other strata stabilisation stabilization articles and other similar named bolting articles such as rock bolts, anchor bolts, anchor tendons, tendons and any other similar articles which can be used for any purpose including drilling and bolting of ribs, floors, walls and faces of mines and any other location requiring strata stabilization.
SUMMARY OF THE INVENTION
This invention provides a roof bolt installation apparatus including a drill stabilizing means including a base having a cylindrical bore therein, and a stabilizing rod extendable from the base and slidably located in the bore. The rod has a distal end, and a drill stabilizing end plate is mounted on the rod distal end. The roof bolt installation apparatus also includes a drilling unit which is adapted to rotatably carry a drill, the drilling unit being slidably mounted on the drill stabilizing means, and means for moving the drilling unit along the drill stabilizing means. The roof bolt installation apparatus also includes a drill depth control device including a base, a top adapted to engage the mine roof, and at least two bars connected between the drill depth control base and the drill depth control top. The bars pass through openings in the drill stabilizing plate.
REFERENCES:
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patent: 3797587 (1974-03-01), Klein
patent: 4757866 (1988-07-01), Szoke
patent: 5431234 (1995-07-01), Klemm
patent: 6105684 (2000-08-01), Pointer et al.
Earl Lowe, Jr. James
Joy MM Delaware Inc.
Truong Thanh
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