| US 7,458,493 B2 | ||
| Combustion chamber arrangement in combustion type power tool | ||
| Tomomasa Nishikawa, Hitachinaka (Japan); and Hiroto Inagawa, Hitachinaka (Japan) | ||
| Assigned to Hitachi Koki Co., Ltd., Tokyo (Japan) | ||
| Filed on Mar. 10, 2006, as Appl. No. 11/371,910. | ||
| Application 11/371910 is a division of application No. 10/997944, filed on Nov. 29, 2004, granted, now 7,066,117. | ||
| Claims priority of application No. P2003-397790 (JP), filed on Nov. 27, 2003. | ||
| Prior Publication US 2006/0151565 A1, Jul. 13, 2006 | ||
| Int. Cl. B25C 1/04 (2006.01) | ||
| U.S. Cl. 227—10 [227/9; 227/11; 227/130; 123/46 SC] | 8 Claims |
| 1. A combustion-type power tool comprising:
a combustion-chamber frame having an inner wall defining a combustion chamber;
a fan disposed in the combustion chamber and rotatable about an axis in a rotational direction; and
an ignition plug exposed to the combustion chamber, and
a plurality of ribs extending parallel to the fan rotation axis and protruding from the inner wall toward the axis of the
fan and spaced away from each other, the plurality of ribs being only located at an area ranging from 0 to 30 degrees and
from 70 to 360 degrees about the axis relative to a connection line connecting between the axis and the ignition plug in the
rotational direction.
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