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(11)    Patent No :    AP 2308    (73) Applicant(s)       
(21)    Application No :    AP/P/2007/003930    ATLAS COPCO MAI GMBH, Werkstrasse 17,  A-9710       
(22)    Filing Date :    20.09.2005    Austria       
(24)    Date of Grant &    10.10.2011           
(45)    Publication :

(30)  Priority Data    (72) Inventors

    (33) Country    (31) Number    (32) Date    SPEARING Anthony John Spencer, United States of   
    ZA    2004/7521    20.09.2004    America   
    ZA    2005/02542    29.03.2005    JINGLE JR Joseph John, United States of America   
                (74) Representative   
(84)    Designated State           
    T Z            HONEY & BLANCKENBERG   
(51)    International    Classification    E21D20/00 (2006.01)   

(54)    Title

An elongate element tensioning member

(57)    Abstract

An adjustable yield rock bolt that comprises an elongated tensile support member that interacts with at least one gouging member and a receiving member capable of receiving the elongated (ensile support member and hold the gouging member segment there between, wherein the elongated tensile support member extends beyond the receiving member a length that corresponds to a predetermined amount of yield before ultimate failure. The bolt has adjustability by allowing for controlled yield by gouging of the elongated tensile support member for any length of displacement.

(56)    Documents Cited :    US-3349662    GB-651556    US-4339217    US-4431348


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