| US 7,524,238 B2 | ||
| Method of processing antifriction bearing unit for wheel | ||
| Takeshi Fukao, Osaka (Japan); and Toshihiro Nakano, Osaka (Japan) | ||
| Assigned to Koyo Seiko Co., Ltd., Osaka (Japan) | ||
| Filed on Apr. 05, 2007, as Appl. No. 11/783,081. | ||
| Application 11/783081 is a division of application No. 11/453913, filed on Jun. 16, 2006, granted, now 7,226,344. | ||
| Application 11/453913 is a division of application No. 10/865839, filed on Jun. 14, 2004, granted, now 7,083,504. | ||
| Claims priority of application No. P.2003-167785 (JP), filed on Jun. 12, 2003; application No. P.2003-179845 (JP), filed on Jun. 24, 2003; and application No. P.2003-290109 (JP), filed on Aug. 08, 2003. | ||
| Prior Publication US 2007/0184764 A1, Aug. 09, 2007 | ||
| Int. Cl. B24B 55/02 (2006.01) | ||
| U.S. Cl. 451—450 [451/550] | 5 Claims |
| 1. A grindstone comprising:
a grinding surface;
a plurality of circumferentially extending substantially arcuate slots that are formed in the grinding surface and spaced
apart from one another on a circle; and
a plurality of coolant grooves connected with said plurality of circumferentially extending substantially arcuate slots, said
coolant grooves comprising:
a first portion extending radially inwardly from said plurality of circumferentially extending substantially arcuate slots;
and
a second portion extending radially outwardly from said plurality of circumferentially extending substantially arcuate slots,
said second portion extending to an outer periphery of the grindstone,
wherein circumferentially opposite ends of said plurality of circumferentially extending substantially arcuate slots have
a semicircular shape.
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