SUBSURFACE PNEUMATIC HAMMER

WIPO Patent Application WO/1997/012121

A1

The proposed invention pertains to percussion tools, in particular to designs for a drill and drill bit. The proposed pneumatic hammer comprises: a housing; a piston-hammer mounted inside the housing; and a drill bit with a shaft of stepped design. The outer surface of the smaller-diameter stage is provided with longitudinal grooves and transverse grooves for lock elements, while the outer surface of the larger-diameter stage is provided with additional longitudinal grooves and a reducer comprising two sections and provided with a central aperture, lock elements and torque-transmission elements in the form of, for example, cylindrical rollers. The larger-diameter section of the reducer is connected to the larger-diameter stage of the shaft and has apertures and blind longitudinal grooves on the inner surface, cylindrical rollers being fitted in the apertures and longitudinal grooves. The proposed device reduces wear and destruction of the reducer and drill bit by reducing mechanical loads when the pneumatic hammer is in operation.

GRECHUSHKIN BORIS ALEXEEVICH (RU)
KADOMKIN VIKTOR VIKTOROVICH (RU)
KOMAROV VLADIMIR MIKHAILOVICH (RU)
FRENKEL BORIS EFIMOVICH (RU)

PCT/RU1996/000329

April 03, 1997

November 14, 1996

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YALESTOWN CORPORATON N V (NL)
GRECHUSHKIN BORIS ALEXEEVICH (RU)
KADOMKIN VIKTOR VIKTOROVICH (RU)
KOMAROV VLADIMIR MIKHAILOVICH (RU)
FRENKEL BORIS EFIMOVICH (RU)

E21B4/14; E21B1/30; E21B10/36; E21B17/046; E21B17/07; (IPC1-7): E21C3/24

SU219489A1
SU289198A1
SU436145A2	1974-07-15
DE1937778A1	1970-02-19

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