Inserted cutting formations for percussive rock drill bits
First Claim
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1. FOR A PERCUSSIVE ROCK DRILL BIT AN INSERT OF TUNGSTEN CARBIDE CONSISTING IN A PLATE-LIKE BODY HAVING TWO FLAT SIDES, A CUTTING EDGE FORMED AS A WEDGE TO PROVIDE A DRILLING EDGE, A BASE AND A REAMING EDGE WHICH IS CURVED TO THE ARC OF A CIRCLE TO BE CONVEX OUTWARDLY AND JOINING THE BASE AT A CORNER WHICH IS AN OBTUSE ANGLE, THE ARC BEING STRUCK FROM A CENTRE POSITION BETWEEN TWO PARALLEL LINES THAT ARE PARALLEL TO THE BASE, THE FIRST LINE BEING A TANGENT TO THE DRILLING EDGE AND THE SECOND LINE BEING SPACED TO WARDS THE BASE FROM THE ROOT OF THE WEDGE A DISTANCE THAT IS EQUAL TO THE DISTANCE OF THE FIRST LINE FROM SUCH ROOT.
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1 Claim
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1. FOR A PERCUSSIVE ROCK DRILL BIT AN INSERT OF TUNGSTEN CARBIDE CONSISTING IN A PLATE-LIKE BODY HAVING TWO FLAT SIDES, A CUTTING EDGE FORMED AS A WEDGE TO PROVIDE A DRILLING EDGE, A BASE AND A REAMING EDGE WHICH IS CURVED TO THE ARC OF A CIRCLE TO BE CONVEX OUTWARDLY AND JOINING THE BASE AT A CORNER WHICH IS AN OBTUSE ANGLE, THE ARC BEING STRUCK FROM A CENTRE POSITION BETWEEN TWO PARALLEL LINES THAT ARE PARALLEL TO THE BASE, THE FIRST LINE BEING A TANGENT TO THE DRILLING EDGE AND THE SECOND LINE BEING SPACED TO WARDS THE BASE FROM THE ROOT OF THE WEDGE A DISTANCE THAT IS EQUAL TO THE DISTANCE OF THE FIRST LINE FROM SUCH ROOT.
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Current AssigneeRees W. Rees
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Original AssigneeRees W. Rees
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InventorsRees, Rees W.
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Application NumberUS04/020,464Time in Patent Office1,126 DaysField of SearchUS Class Current175/420.1CPC Class CodesE21B 10/58 Chisel-type inserts E21B10/...
