Grinding cup and holder device
First Claim
1. A grinding cup for detachable connection to the drive shaft of a grinding machine for grinding buttons on drill bits, said grinding cup having top and bottom surfaces and consisting of a lower grinding section and an upper body section;
- said lower grinding section having a centrally disposed recess formed in the bottom surface of said grinding cup and having the desired profile for the button to be ground;
wherein the peripheral edge in the bottom surface of the grinding cup is bevelled to facilitate the removal of steel from the face of the bit around the button during grinding;
said upper body section having a centrally disposed cavity formed in the top surface of the grinding cup;
said cavity shaped and sized to permit the drive shaft of a grinding machine to fit snugly within the cavity and retaining means for detachably connecting the grinding cup to the drive shaft of the grinding machine.
1 Assignment
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Accused Products
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. This cavity is shaped and sized to permit the grinding cup to be detachably connected to the drive member of a grinding machine and rotated during the grinding operation. One or more passageways connect the floor of the cavity in the top surface of the grinding cup with the convex recess in the grinding section to permit a coolant, preferably water, optionally mixed with cutting oil, to be provided to the surface of the button during grinding, through one or more outlets.
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Citations
17 Claims
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1. A grinding cup for detachable connection to the drive shaft of a grinding machine for grinding buttons on drill bits, said grinding cup having top and bottom surfaces and consisting of a lower grinding section and an upper body section;
- said lower grinding section having a centrally disposed recess formed in the bottom surface of said grinding cup and having the desired profile for the button to be ground;
wherein the peripheral edge in the bottom surface of the grinding cup is bevelled to facilitate the removal of steel from the face of the bit around the button during grinding;
said upper body section having a centrally disposed cavity formed in the top surface of the grinding cup;
said cavity shaped and sized to permit the drive shaft of a grinding machine to fit snugly within the cavity and retaining means for detachably connecting the grinding cup to the drive shaft of the grinding machine. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13, 14, 15, 16, 17)
- said lower grinding section having a centrally disposed recess formed in the bottom surface of said grinding cup and having the desired profile for the button to be ground;
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7. A grinding cup for detachable connection to the drive shaft of a grinding machine for grinding buttons on drill bits, said grinding cup having top and bottom surfaces and consisting of a lower grinding section and an upper body section;
- said lower grinding section having a centrally disposed recess formed in the bottom surface of said grinding cup and having the desired profile for the button to be ground;
wherein the peripheral edge in the bottom surface of said grinding cup is bevelled to facilitate the removal of steel from the face of the bit around the button during grinding;
retaining means for detachably connecting the grinding cup to the drive shaft of the grinding machine and two or more passageways through said grinding section and said body section to permit coolant to be provided to the said recess in the bottom surface of the grinding cup. - View Dependent Claims (8, 9, 10, 11)
- said lower grinding section having a centrally disposed recess formed in the bottom surface of said grinding cup and having the desired profile for the button to be ground;
Specification