Document Type and Number:
Japanese Patent JPS5136686
Kind Code:
B1
Abstract:
1312386 Mine roof support frames HERMANN HEMSCHEIDT MASCHINENFABRIK 29 Nov 1971 [23 Dec 1970] 55361/71 Heading E1P A mine roof support frame consists of a central section 1, 6, 7 of greater load-bearing area and load-bearing capacity than adjacent end units 12, 14 which are articulated thereto as at 10, 11 at both roof and floor levels; the roof and floor beams being selectively locked to-gether by sliding shoes 20 to form a rigid structure when desired.
Application Number:
JP10450571A
Publication Date:
October 09, 1976
Filing Date:
December 22, 1971
Export Citation:
International Classes:
E21D11/14; (IPC1-7): E21D15/00
Domestic Patent References:
| JP39007905A |