| US 7,568,770 B2 | ||
| Superhard composite material bonded to a steel body | ||
| David R. Hall, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US); Ronald Crockett, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US); Jeff Jepson, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US); and Joe Fox, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US) | ||
| Filed on Mar. 15, 2007, as Appl. No. 11/686,831. | ||
| Application 11/686831 is a continuation in part of application No. 11/673634, filed on Feb. 12, 2007. | ||
| Application 11/673634 is a continuation in part of application No. 11/668254, filed on Jan. 29, 2007, granted, now 7,353,893. | ||
| Application 11/668254 is a continuation in part of application No. 11/553338, filed on Oct. 26, 2006. | ||
| Application 11/668254 is a continuation in part of application No. 11/686831. | ||
| Application 11/686831 is a continuation in part of application No. 11/424806, filed on Jun. 16, 2006. | ||
| Prior Publication US 2007/0290547 A1, Dec. 20, 2007 | ||
| Int. Cl. E21C 35/183 (2006.01) | ||
| U.S. Cl. 299—105 [299/104; 299/113] | 18 Claims |
| 1. A pick, comprising:
a steel body comprising a formed shank attached to a first end of the body and generally extending along a central axis of
the body;
an impact tip secured to a second end of the steel body;
the tip comprising a carbide substrate attached to the second end of the steel body and being bonded to a diamond material;
a composite material fixed within a plurality of annular grooves formed in an outer surface of the steel body and adapted
to protect the steel from wear, at least one groove being formed proximate the tip;
the composite material comprising a plurality of diamond particles held within a matrix; and
the matrix comprising a diamond particle concentration of 40 to 80 percent by volume.
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