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1. (WO2013114258) CUTTER FOR SHAFT AND/OR TUNNEL BORING

Pub. No.:    WO/2013/114258    International Application No.:    PCT/IB2013/050664
Publication Date: Fri Aug 09 01:59:59 CEST 2013 International Filing Date: Sat Jan 26 00:59:59 CET 2013
IPC: E21B 10/12
Applicants: STEIN NARVESTAD A.S
NARVESTAD, Stein
Inventors: NARVESTAD, Stein
Title: CUTTER FOR SHAFT AND/OR TUNNEL BORING
Abstract:
A cutter is provided for shaft and/or tunnel boring which comprises a divided cutter ring (10a, 10b) and a cutter body (8) with a recess (17). The cutter ring (10a, 10b) is secured in the recess (17) by a divided clamping ring (18). The clamping ring (18) is divided into at least two segments (18a, 18b) where each segment (18a, 18b) has two segment ends, with the result that when the clamping ring (18) is tightened, a number of pairs of opposite segment ends are formed. Furthermore, in a tightened condition, all the pairs of opposite segment ends are either connected to securing elements (20), or, in a tightened condition, at least one pair of opposite segments ends is connected with a hinged device (19) while the remaining pairs of opposite segment ends are connected to securing elements (20). The segments (18a, 18b) are tightened in the segments' (18a, 18b) circumferential direction.