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(11)    Patent No :    AP 2078   
(21)    Application No :    AP/P/2006/003656   
(22)    Filing Date :    22.11.2004   
(24)    Date of Grant &    28.12.2009   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/523,319    20.11.2003

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s)

J. S. REDPATH LIMITED, 710 Mckeown Avenue, P O Box 810, North Bay, Ontario PIB 8KI,

(72) Inventors

MEDD Morris J., Canada

(74) Representative


(51)  International  Classification   B07B 1/34 (2006.01)    E21B 23/00 (2006.01)
E21B 23/04 (2006.01)   

(54)    Title

Earth boring apparatus for sinking shafts and method of excavating a shaft

(57)    Abstract

An earth boring apparatus for sinking shafts and removing shaft material from
the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one another, releasable anchoring means associated with the decks for engaging walls of the shaft to secure the apparatus in a stationary position; whereby the releasable anchoring means of

one of the decks engages the wall while the releasable anchoring means of the other deck is released from the wall to allow motion of the other deck along the shaft, in cooperation with the hydraulic means. The apparatus also

(56)    Documents Cited :    JP 11200763 A    US 4 274 675 A    US 4 646 853 A
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