Matches 1 - 25 out of 25


Match Document Document Title
US20070119624 Roof drilling improvements  
The invention is embodied in a heavy duty drill bit for hard/soft rock drilling comprising a high fatigue resistant, high alloy steel bit body having a PCD cutter element of super hard material...
US20050045385 Down-the-hole drill hammer  
The present invention relates to an arrangement pertaining to down-the-hole hammers in which a driver (7) is adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit...
US20050173158 Compressed air percussive mechanism for a down hole hammer and down hole hammer  
Pressure-air driven percussion device for a down-the-hole drill (1) with a hammer-piston (86) which is axially reciprocally movable in a hammer-piston chamber (18) through a driving device (9),...
US20080149399 Rotary percussion drill with a hard material bit  
A rotary-percussion drill, includes a hard material bit (2, 2′) having at least one cutting edge (3, 3′), and a shaft having an end (7, 7′) with an axial base surface (6, 6′) provided with a...
US20090071725 Percussion Hammer for Enlarging Drilled Holes  
The present invention relates to a percussion hammer for enlarging drilled holes. The hammer comprises an external outer wear sleeve (5), an inner cylinder (7) mounted co-axially within the outer...
US20060032675 Drill  
A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a drilling head (10, 20, 30) formed of a hard material and provided, at its first end (5) with...
US20060096788 Reamer assembly  
A reamer assembly for widening a drilled pilot hole or for widening a hole that has been widened in a first step in a down-the-hole drilling operation, includes a shank (14) for attachment of the...
US20060254829 Angular offset PDC cutting structures  
A drill bit with a drill bit body having a cutting structure face. A pin is formed on the drill bit body for attaching the drill bit body to a drill string. The pin has a first central axis to be...
US20060196699 Modular kerfing drill bit  
A modular kerfing rock drilling bit (10) is presented. Drill bit (10) comprises a bit body (12) having a connection (14) for attachment to a drill string member. A base portion (16) below the...
US20060249309 Drill bit, system, and method for drilling a borehole in an earth formation  
A drill bit for drilling a borehole in an earth formation. The drill bit has a central longitudinal axis and may be operated by applying at least a rotary motion about the central longitudinal...
US20080245220 Percussion Mechanism and at Least Percussively-Operated Hand Machine Tool With a Percussion Mechanism  
The invention relates to a percussion mechanism for an at least percussively-operated hand machine tool, in particular a hammer drill or chisel, comprising a drive motor and a tool holder (10) for...
US20080110679 Drill with a hard material drilling head  
A one-piece drilling head (4) which is to be secured, in a material-locking manner, at an end of a helical shaft of a drill, is formed of hard material and includes four radially extending, in a...
US20100163314 ROCK DRILL  
The invention relates to a rock drill (1) for rotational and percussive action, comprising a drill head (2), a conveying helix (3), a clamping shank and a longitudinal drill axis (L), wherein the...
US20130008722 Down-Hole Hammer Drill  
A down-hole hammer comprising a drill bit (10) and a drive collar (11) with an interconnection therebetween for causing rotation of the drill bit upon rotation of the drive collar. The drill bit...
US20140069722 HAMMER BIT  
A hammer bit is herein described with tapered lateral sides and a modified face section. The tapered lateral sides taper inward towards a rear portion of the hammer bit. The modified face section...
US20140014412 Polycrystalline diamond percussion drill bits using low thrust and torque for application with small diameter drill bits  
A polycrystalline diamond drill bit for percussion drilling uses very low torque and thrust that is formed of very specific insert and bit body dimensions to achieve maximum penetration rates and...
US20120186883 DRILL BIT ASSEMBLY FOR FLUID-OPERATED PERCUSSION DRILL TOOLS  
The present invention relates to a drill bit assembly for fluid-operated percussion drill tools comprising a percussion bit (1) having a head portion (3) formed with an axially extending stub...
US20130180784 ROCK DRILL BIT AND A DRILLING ASSEMBLY FOR PERCUSSIVE ROCK DRILLING  
A rock drill bit for percussive drilling includes a bit head attached at an end of a drill element of a drilling assembly. The bit head has a diameter larger than that of the drill element. The...
US20110168453 ROCK DRILL BIT  
A rock drill bit comprising a shank fitted with a clamping end and a drilling tip at the end away from the clamping end, the drilling tip comprising at least three, preferably exactly three blades...
US20100108395 Drill bit assembly for fluid-operated percussion drill tools  
The invention relates to a drill bit assembly for fluid-operated percussion drill tools comprising a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32)....
US20130180785 ROCK DRILL BIT FOR PERCUSSIVE DRILLING AND A ROCK DRILL BIT BUTTON  
A button and a rock drill bit for percussive drilling including a bit head attached at an end of a drill element of a drilling assembly. The bit head has at a front end, as seen in the intended...
US20170130532 Polycrystalline diamond percussion drill bits using low thrust and torque and incorporating PCD chisel type inserts, or combination of PCD chisel type inserts with PCD conical inserts, for application with small diameter drill bits  
A polycrystalline diamond drill bit for percussion drilling, in small hole high silica ground. The bit is made having a bit body, and a series of inserts locating in the bit body, and the bits are...
US20160108678 BORING APPARATUS AND METHOD  
An apparatus for boring a wellbore, including a bit body having a first end, an inner cavity, and a second end. The first end is connected to a workstring that is configured to deliver a...
US20160090791 PERCUSSIVE ROCK DRILL BIT  
A percussive rock drill bit includes a head provided at one end of a rearwardly projecting skirt. The head has an outer collar that defines, in part, a rearwardly projecting recess formed in the...
US20160069134 DEVICE AND SYSTEM FOR PERCUSSION ROCK DRILLING  
A drill bit for percussion rock drilling. An impact portion includes an impact surface for striking against rock in an impact direction. An engagement portion includes a holder configured to hold...

Matches 1 - 25 out of 25