Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 21, 2009
Patent Application Number
11904172
Date Filed
September 26, 2007
Patent Primary Examiner
Patent abstract
A drill housing rotatably supports a shaft having an internal cavity for receiving a drilling device, such as a drill steel, bolt driver, and rock anchor adaptor. The upper end of the housing is closed by a cover plate and a flinger having an opening for receiving pressurized fluid and a passageway for transporting the pressurized fluid into the shaft. The pressurized fluid axially displaces a collet mounted within the shaft against the bias of a spring to frictionally engage the drilling device to transmit rotation thereto.
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