EP 0029020 B1 19840208 - METHOD OF SINKING SHAFTS AND APPARATUS TO CARRY OUT THIS METHOD
Title (en)
METHOD OF SINKING SHAFTS AND APPARATUS TO CARRY OUT THIS METHOD
Publication
Application
Priority
AT 721079 A 19791109
Abstract (en)
[origin: US4379594A] For sinking of shafts, a cutting machine (1) is provided having its cutting arm (3) pivotable around a vertical axis (4) and a horizontal axis (5). The cutting arm (3) carries cutting heads (14) which are rotatable around an axis (15) horizontally arranged and extending perpendicularly relative to the axis of the cutting arm. The shaft is now sunk around its circumference (9) in direction of its axis (10), for which purpose first the uppermost lead of a screw surface is prepared. On this uppermost lead of the screw surface the cutting machine is advanced until the cutting heads (14) contact the shaft wall (9). In the following, a floor cut (19) is made whereupon a further floor cut (20) is made at a lower level. Starting from a corresponding position of the cutting machine surfaces (23, 24) are cut free starting from the shaft wall (9). This manner of operation is continued thereby repeating the previous process steps until the whole screw surface is cut free, the cutting machine thereby being moved in backward direction. Any area (30) possibly remaining close to the axis of the shaft and being not within the operating range of the cutting arm can subsequently be broken away or be removed by cutting operating in another position of the cutting machine (FIG. 2).
IPC 1-7
IPC 8 full level
CPC (source: EP US)
E21D 1/03 (2013.01 - EP US)
Citation (examination)
DE 1912311 A1 19691218 - INGBUREAUVOOR SYSTEMEN EN OCTR
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0029020 A1 19810520; EP 0029020 B1 19840208; AT 365739 B 19820210; AT A721079 A 19810615; AU 537879 B2 19840719; AU 6378780 A 19810514; BR 8007278 A 19810519; CA 1163652 A 19840313; DE 3066514 D1 19840315; IN 154135 B 19840922; JP S5677494 A 19810625; NZ 195492 A 19840427; PL 227733 A1 19811113; SU 1277908 A3 19861215; US 4379594 A 19830412; YU 278080 A 19831031; ZA 806566 B 19811028
DOCDB simple family (application)
EP 80890127 A 19801024; AT 721079 A 19791109; AU 6378780 A 19801028; BR 8007278 A 19801107; CA 364098 A 19801106; DE 3066514 T 19801024; IN 1223CA1980 A 19801028; JP 15807580 A 19801110; NZ 19549280 A 19801107; PL 22773380 A 19801107; SU 3001096 A 19801106; US 20438280 A 19801105; YU 278080 A 19801030; ZA 806566 A 19801024