| US 7,413,256 B2 | ||
| Washer for a degradation assembly | ||
| David R. Hall, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US); Ronald Crockett, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US); and Jeff Jepson, 2185 S. Larsen Pkwy., Provo, Utah 84606 (US) | ||
| Filed on Aug. 11, 2006, as Appl. No. 11/463,962. | ||
| Prior Publication US 2008/0036272 A1, Feb. 14, 2008 | ||
| Int. Cl. E21C 35/18 (2006.01) | ||
| U.S. Cl. 299—104 [299/107] | 18 Claims |
| 1. A degradation assembly comprising:
an attack tool comprising a body and a shank, the body comprising a wear resistant tip;
the shank being disposed within a bore of a holder secured to a driving mechanism; and
a steel washer positioned in-between the attack tool and the holder and fitted around the shank of the attack tool, wherein
one or both of an inner and outer surface of the steel washer is coated with tungsten carbide comprising a binder;
wherein the washer comprises a plurality of coatings, wherein the washer of comprises a coating of tungsten carbide intermediate
the steel of the washer and a layer of diamond.
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