Abstract

The present invention relates to a ground drilling hammer and a sleeve thereof, and more specifically, to a ground drilling hammer and sleeve which comprises, a cylindrical casing, a back head in which external compressed air flows, a guide and a sleeve which distribute the compressed air into the top and the bottom of a piston, wherein the piston is moved up and down by the compressed air, a chuck combined at the bottom of a casing, and a button bit which digs the ground by the hitting force of the piston. In addition, the ground drilling hammer and the sleeve thereof allow smooth up-and-down motion of the piston, because there is little space to form an oppressed air chamber on one side of the piston, and considerably improves the durability of the equipment by reinforcing the physical strength of the sleeve and the piston at the same time.

IPC Classes  ?

• E21B 10/36 - Percussion drill bits
• E21B 1/30 - Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure
• E21B 4/06 - Down-hole impacting means, e.g. hammers

Abstract

The present invention relates to a borehole drilling apparatus with in-line extending wings and driving method thereof. The drilling apparatus comprises a guide device rotating while moving upwardly and downwardly in a casing to fit into a borehole, extending wings for extending the diameter of a drilled hole, and a pilot bit installed at a lower portion of the guide device to strike the bottom of the borehole, wherein spiral projections formed at a lower surface of the guide device slidably engage with guide grooves formed at a side of the extending wings to each other, and a window is formed at a side of the pilot bit for advancing and retracting the extending wings so that they can spread and return linearly from the center of the pilot bit.

IPC Classes  ?

• E21B 10/32 - Drill bits with leading portion, i.e. drill bits with a pilot cutterDrill bits for enlarging the borehole, e.g. reamers with expansible cutting tools

Abstract

The present invention relates to a borehole drilling apparatus with in-line extending wings and driving method thereof. The drilling apparatus comprises a guide device rotating while moving upwardly and downwardly in a casing to fit into aborehole, extending wings for exter.kappa.ling the diameter of adriUedhole, ar.kappa.iapUotbitinstelledatalowerportionofthe guide deviceto strike the bottom of the borehole, wherein spiral projections formed at a lower surface of tiie guide device slidably engage with guide grooves formed at a side of the extending wings to each other, and a window is formed at a side of Hie pilot bit for advancing and retracting the extending wings so that they can spread and return linearly from the center of the pilot bit

IPC Classes  ?

• E21B 1/30 - Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure