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(11)    Patent No :    AP 1981    (73) Applicant(s)       
(21)    Application No :    AP/P/2005/003461    FLEXIDRILL LIMITED, 220 Lake Road, Takapuna,       
            New Zealand       
                   
(22)    Filing Date :    18.06.2004           
(24)    Date of Grant &    23.03.2009           
                   
(45)    Publication :

(30)    Priority Data                    (72) Inventors   
    (33) Country    (31) Number    (32) Date    PFAHLERT Roger, New Zealand   
    NZ            526639        20.06.2003           
    NZ            531833        18.03.2004           
    NZ            532050        30.03.2004           
    et al                                   
                                (74) Representative   
(84)    Designated State                   
                           
    BW    GM    GH    KE    LS    MW    MZ   NA   SL    HONEY & BLANCKENBERG   
                                       
    SD    SZ    T Z    UG    ZM    ZW               
(51)    International    Classification    E02D 3/054 (2006.01)    E21B 7/24 (2006.01)   
                            E21B 78/00 (2006.01)       
(54)    Title

Sonic heads and assemblies and uses thereof

(57)    Abstract

A sonic head assembly suitable for generating an output, said assembly having a frame, a sonic head carrying, carried by, substantially locating or substantially being located by the frame, wherein the sonic head has a spaced

pair of pistons each located within a head cylinder, and wherein each headed cylinder has a valving arrangement whereby a variable volume can be deined by the piston relative to the headed cylinder as a consequence of fluid supply into and/or fluid release from the variable volume chamber reliant on the valving arrangement, and wherein the valving arrangement of on headed cylinder is out of phase with the other such that as one chamber increases in volume as a consequence of fluid supply thereto, the other correspondingly

(56)    Documents Cited :    WO 1997/046787 A   EP 0 333 484 A

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