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(11)Patent No :AP 2548

(21)Application No :AP/P/2009/004862

(22)Filing Date :17.10.2007

(24)Date of Grant &26.12.2012

(45)Publication : 

(30)  Priority Data

(33) Country(31) Number(32) Date

AU200690584020.10.2007

 

(84)Designated State 

 

BWGMGHKELSMW  MZ   NA   SL

SDSZT ZUGZMZW

(73) Applicant(s)

DRILLROC PNEUMATIC PTY LTD, 44 Dongarven Drive,

Eagleby, Queensland 4207,

Australia

(72) Inventors

LORGER Tony, Australia

 

LORGER Daniel Paul, Australia

 

(74) Representative

 

HONEY & BLANCKENBERG

(51)  International  Classification   E21B 1/38  (2006.01)E21B 10/40 (2006.01)

 

(54)Title 

Down-the-hole hammer drill 

(57)Abstract 

 

There is provided a downhole hammer including a drill bit (2) retained by short (4) and long (5) drive pins in the bore of a driver chuck (1). The chuck 

 

(1) and bit (2) shank have machined longitudinal grooves (3), every second bit shank groove being blind and connected to the adjacent open groove by a 

 

short-pin-length relief. The shorter pins (4) are inserted into the visible holes 

 

formed by the alignment of the open drill bit grooves and driver chuck grooves (3). The chuck (1) is then indexed which shunts the short pins (4)

 

sideways until the longer pins (5) are insertable. The driver chuck (1) and drill bit (2) are engaged rotationally. The bit (2) slides by the desired distance due to the shorter pins (4) being entrapped in the blind grooves. The arrangement

 

(56)Documents Cited :EP-244986US-2665115 AUS-5511628 AUS-2859733 A

 

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