Submersible pneumatic drilling unit

Details Submersible pneumatic drilling unit Submersible pneumatic drilling unit

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) B25D 9/08 (2006.01)

Patent

CA 2054925

ABSTRACT OF THE DISCLOSURE: A heavy duty submersible pneumatic impact drilling unit is disclosed which comprises a working cylinder, a striking piston, an upper lid and a drill bit holder. A front side duct in the wall of an upper working space of the working cylinder, communicating via an upper filling duct and a rear side duct with a storage space provided in the upper lid, and a front bypass duct communicating via an axial duct in an axial pin and a rear bypass duct with the storage space, axially define in the upper working space of the working cyclinder, a compression space confined by the inner wall of the working cylinder, further a front face of the upper lid and by the external surface of the axial pin. The upper lid together with the axial pin and the built-in storage space form an assembly group in which an air valve is received. The frequency of the drilling unit is increased.

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