Wrench having a locking device with a smaller driving angle

Details Wrench having a locking device with a smaller driving angle Wrench having a locking device with a smaller driving angle

2006-12-12

2006-12-12

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S063100

Reexamination Certificate

active

07146881

ABSTRACT:
A wrench includes a drive head, a drive member, a plurality of locking teeth mounted on either one of the inner wall of the drive head and the drive member, and two locking devices located beside the drive member. An urging block is located between the two locking devices for pressing one of the two locking devices to engage with the drive member. Each of the locking devices includes two driving blocks each formed with a locking end engageable with the locking teeth to drive the drive member. The locking ends of the two driving blocks are respectively engaged with the locking teeth at different time. Thus, the locking device has a smaller driving angle for driving the drive member.

REFERENCES:
patent: 4423649 (1984-01-01), Junkers et al.
patent: 5537899 (1996-07-01), Diedrich
patent: 5782147 (1998-07-01), Chaconas et al.
patent: 5960680 (1999-10-01), Chen et al.
patent: 6101902 (2000-08-01), Wei
patent: 6305247 (2001-10-01), Chen
patent: 6457386 (2002-10-01), Chiang
patent: 6629477 (2003-10-01), Ling et al.

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