US Patent 7665548 Secondary retainer for a downhole hammer bit
Patent 7665548 was granted and assigned to Smith International on February, 2010 by the United States Patent and Trademark Office.
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A bit retainer system includes a bit having a head and a shank, a driver sub disposed around the shank of the bit and adapted to engage a hammer case, a bit retainer including a segmented retainer ring configured with a circumferential groove on an outside diameter of the segmented ring, the bit retainer disposed around the shank of the bit and abutting an upper end of the driver sub. The bit retainer system further includes a secondary retainer disposed around the bit retainer, wherein the secondary retainer includes a plurality of webs disposed at selected locations along the secondary retainer configured to engage the circumferential groove of the segmented retainer ring.
US Patent 07665548 Secondary retainer for a downhole hammer bit US Patent 7665548 Secondary retainer for a downhole hammer bit
US Patent 07665548 Secondary retainer for a downhole hammer bit
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