Patent ID: 7338051

Claim:
A tool holder ( 1 ) for a rotary hammer, comprising: a tube like tool holder main body ( 10 ) having a side wall including a radially inward facing surface and formed with a first through hole ( 11 ), for receiving a locking body ( 12 ) for releaseably engaging a corresponding axial closed groove of a shank inserted within the tool holder, and formed with a second through hole ( 40 ); a hardened metal driving rib ( 46 ) located on an insert ( 42 ), the insert is fitted within the second through hole ( 40 ) so that the driving rib extends axially and extends radially inwardly of the radially inward facing surface for engaging a corresponding axial rearwardly open driving groove of the shank inserted within the tool holder; and characterized in that the second through hole ( 40 ) is formed by at least two overlapping axially offset circular cross-sectioned through holes ( 40 a , 40 b ) and the corresponding insert has a base ( 44 ) shaped to fit the second through hole ( 40 ).