Improvements in or relating to mine roof supports
Номер патента: GB1271269A
Опубликовано: 19-04-1972
Автор(ы): Frederick Billington
Принадлежит: Gullick Dobson Ltd
Опубликовано: 19-04-1972
Автор(ы): Frederick Billington
Принадлежит: Gullick Dobson Ltd
Реферат: 1,271,269. Advancing mine roof supports. GULLICK DOBSON Ltd. 4 June, 1970 [5 June, 1969], No. 28595/69. Heading E1P. In an advancing mine roof support having a cantilever extension 19 reciprocated by a ram 23 acting on a prop 18 pivotable about a pivot 22 and adapted to urge the member 19 into contact with the roof, the member 19 is provided with a tilting piece 119, see also Fig. 6 (not shown) to accommodate roof irregularities. In a modification, Figs. 4 and 5 (not shown) the member 19 is advanced by a ram which is supported from the underside of the canopy of the main roof support by brackets.
Improvements in or relating to mine timbering
Номер патента: GB537485A. Автор: . Владелец: Individual. Дата публикации: 1941-06-24.