US 6,981,435 B2 | ||
Ratchet wrench having a sealing structure | ||
Chih-Ching Hsien, 58, Ma Yuan West St., Taichung (Taiwan) | ||
Filed on May 08, 2003, as Appl. No. 10/436,417. | ||
Prior Publication US 2004/0221687 A1, Nov. 11, 2004 | ||
Int. Cl. B25B 13/46 (2006.01) |
U.S. Cl. 81—63.2 | 2 Claims |
1. A ratchet wrench, comprising:
a wrench body having a drive head formed with a receiving recess;
a ratchet wheel rotatably mounted in the receiving recess of the drive head;
a positioning member secured in the receiving recess of the drive head and secured on the ratchet wheel to retain the ratchet
wheel in the receiving recess of the drive head; and
an oil seal secured in the receiving recess of the drive head and enclosed around the positioning member; wherein
the positioning member is a C shape snap;
the oil seal having a substantially L-shape cross-section;
wherein the receiving recess of the drive head has an end formed with a protruding shoulder having a bottom formed with an
annular groove, the ratchet wheel has an outer wall having an end formed with an annular locking recess aligning with the
annular groove of the protruding shoulder of the drive head, and the ratchet wrench further comprises a second oil seal secured
in the locking recess of the ratchet wheel and received in the annular groove of the protruding shoulder of the drive head
to seal the inner space of the ratchet wheel.
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