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(11)    Patent No :    AP 2305   
(21)    Application No :    AP/P/2008/004398   
(22)    Filing Date :    07.09.2006   
(24)    Date of Grant &    05.10.2011   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
GB    0518249.8    07.09.2005

(84)    Designated State

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

GLENCROSS LIMITED, 7 New Street, St Peter Port,

Guernmsey GY1 4BZ,
United Kingdom

(72) Inventors

BARROWS Alan, United Kingdom

BARROWS Douglas, United Kingdom

(74) Representative

HONEY & BLANCKENBERG
 

(51)  International  Classification   B25D 17/06 (2006.01)    B25D 9/14 (2006.01)
E21B 19/04 (2006.01)   


(54)    Title

Water powered impulsive unit

(57)    Abstract

An impulsive unit (12) for a jack hammer (10) or rock drill (80, Figs 2 and 3) is adapted to be powered by water, and comprises a piston (34) slidable within a cylinder (32), and carrying a striker portion (35) thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminium oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-metre

(56)    Documents Cited :    EP-0171374    DE-3342879

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