Abstract: The present disclosure relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis wherein the support system comprises an arm or lever system to control vertical movement of the grinding machine and means to provide grinding pressure, wherein the means to provide grinding pressure may be a linear actuator and load cell assembly pivotally connected to the arm or lever system.

Abstract: A grinding cup for detachable connection to the output drive shaft of a grinding machine for grinding buttons on drill bits or cutters, said grinding cup having top and bottom surfaces and consisting of a lower grinding section and an upper body section with a centrally disposed recess formed in the bottom surface of the grinding section; said body section having a centrally disposed upright drive section formed on the top surface of the grinding cup, said drive section shaped and sized to both driveably engage within a corresponding recess at end of the output drive shaft and provide axial and radial support and retaining means for detachably connecting the grinding cup to the output drive shaft wherein said drive section has a non-circular cross section and is tapered from the top surface of the grinding cup to the free end of the drive section.

Abstract: The present disclosure relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis wherein the support system comprises an arm or lever system to control vertical movement of the grinding machine and means to provide grinding pressure, wherein the means to provide grinding pressure may be a linear actuator and load cell assembly pivotally connected to the arm or lever system.

Abstract: A locking means for a bit holder fixture for use with grinding apparatus for grinding the hard metal inserts of rock drill bits is provided. The locking means has a macro adjustment for quick positioning of a pressure plate against the body of the bit(s) and a micro adjustment to lock the bit(s) in place by applying pressure against the skirt or shank of the drill bit(s).

Abstract: A locking means for a bit holder fixture for use with grinding apparatus for grinding the hard metal inserts of rock drill bits is provided. The locking means has a macro adjustment for quick positioning of a pressure plate against the body of the bit(s) and a micro adjustment to lock the bit(s) in place by applying pressure against the skirt or shank of the drill bit(s).

Abstract: The present invention provides a grinding member or connection to a drive connection member to form a grinding cup for grinding the hard metal inserts or working tips of drill bits (percussive or rotary), tunnel boring machine cutters (TBM) and raised bore machine cutters (RBM) to restore them to substantially their original profile, said grinding member having: a. a grinding section having top and bottom surfaces, a centrally disposed convex recess formed in the bottom surface of said grinding section having the desired profile to be ground; b. a support section adjacent the top surface of said grinding section; c. means to connect the grinding member to the drive connection member wherein the grinding member can be disconnected from the drive connection member when it becomes worn.

Abstract: The present invention relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system that provides a feed pressure for said grinding machine during grinding, said grinding machine equipped with a grinding pin driven by motor to rotate about its longitudinal axis wherein the grinding cup is rotated at variable speeds and the support system provides a variable feed pressure.

Abstract: A grinding apparatus for grinding the hard metal inserts or working tips of drill bits (percussive or rotary), tunnel boring machine cutters (TMB) and raised bore machine cutters (RBM), said grinding apparatus having means for holding one or more bits to be ground and a grinding machine carried by an arm or lever system that permits movement of the grinding machine relative to the longitudinal axis of the button of the bit to be ground wherein means are provided to assist with aligning the grinding machine with the longitudinal axis of the button to be ground.

Abstract: The present invention provides a grinding cup having a lower grinding cup having a lower grinding section (32) connected to form a grinding cup having top and bottom surfaces. The grinding section is formed from a material capable of grinding the hard materials such as tungsten carbide inserts of button bits etc. A centrally disposed convex recess is formed in the bottom surface having the desired size and profile for the button to be found. Drive means are provided on or in the upper body section that cooperate with the output shaft of the grinding machine. The drive means and the upper body section or grinding section of the grinding cup are adapted to optimize the engagement surfaces and points of contact between the grinding cup and rotor or adapter to reduce negative impact on operational stability and rotor wear, as well as other potential associated wear to the grinding apparatus caused by vibration and/or resonance.

Abstract: The present invention relates to improvements in devices for use as grinding cups for grinding the hard metal pins or working tips of drill bits and more specifically, but not exclusively, for grinding the tungsten carbide cutting teeth or buttons of a drilling head and the means for detachably connecting the grinding cups to the grinding machine. The grinding cups consisting of a bottom grinding section and a top body section having top and bottom surfaces. The grinding section is formed from a material capable of grinding the tungsten carbide button bits such as a metal and diamond matrix. The peripheral edge in the bottom surface may be bevelled to facilitate the removal of steel from the face of the bit around the base of the button during grinding. A centrally disposed convex recess is formed in the bottom surface having the desired profile for the button to be ground. The body section has a centrally disposed cavity formed in the top surface of the grinding cup.

Abstract: An arrangement for grinding the hardmetal pins of drill bits, e.g. the tungsten carbide buttons (31) of button bits (1), comprises means (parallel arms pairs 9 and 10) for adjusting the position of a grinding pin (15) in relation to the drill bit (1) and also journalling means (4) operative to cause the grinding machine (3) to move relatively slowly in a circuit path around the button on the drill bit (1) to be ground and to cause the grinding pin (15) to rotate rapidly around its longitudinal axis. The drill bit is clamped securely in a stationary holder arrangement (2) which includes a tiltable table (35) which can be adjusted to and locked in selected angular positions.