Claims
- 1. A coal mining apparatus for shearing a long wall face of a coal mine wherein at least one safety wall is left between at least one end of said long wall face and an intake or exhaust tunnel, comprising:
- a drum shearer,
- at least one shearing drum having a radius and a horizontal drum axis on said drum shearer;
- means on said drum shearer for permitting extension of said shearing drum through said safety wall a distance greater than said radius at regular intervals to enter at least one of said tunnels and thereby to form at least one of intake and exhaust openings communicating with at least one of said tunnels leaving a plurality of safety pillars therebetween;
- means on said drum shearer for supporting said horizontal drum axis of said shearing drum; and
- said means for permitting extensions being shearing means at least on said means for supporting.
- 2. A coal mining apparatus according to claim 1, wherein said drum shearer includes a body, said means for supporting said shearing drum includes at least one lateral arm projecting beyond a lateral perimeter of said body, said shearing drum having shearing blades affixed thereto and being rotatably affixed to said lateral arm by said horizontal drum axis, drive means between said body and said lateral arm for driving said shearing drum, and said shearing means on said means for supporting includes other shearing blades on said drive means.
- 3. The apparatus recited in claim 2 wherein said means for permitting extension further includes a rotatable sub-shearing drum coaxial with said shearing drum.
- 4. The apparatus recited in claim 3 wherein said sub-shearing drum is disposed on the opposite side of said drive means from said shearing drum.
- 5. The apparatus recited in claim 3 further comprising said shearing drum and said sub-shearing drum being disposed on opposite sides of said lateral arm.
- 6. The apparatus recited in claim 2 wherein said at least one lateral arm comprises first and second lateral arms disposed at opposed lateral ends of said body.
Parent Case Info
This is a division of application Ser. No. 917,810, filed June 22, 1978.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3753595 |
Lanfermann |
Aug 1973 |
|
3907367 |
Nakajima et al. |
Sep 1975 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
53970 |
Apr 1966 |
PLX |
1060489 |
Mar 1967 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
917810 |
Jun 1978 |
|