Hand tool having a joint lock mechanism

Details Hand tool having a joint lock mechanism Hand tool having a joint lock mechanism

2006-02-21

2006-02-21

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle or shank

C081S177800, C081S177700

Reexamination Certificate

active

07000507

ABSTRACT:
A hand tool having an adjustable head comprises a head, a handle, a fastening device and a joint lock mechanism, characterised in that:a bottom side of a concave pivotal portion of the handle has an inclining surface inclining forwardly from a first side of the concave pivotal portion to a second side of the concave pivotal portion; the joint lock mechanism comprises:a first engaging device and a second engaging device; the second engaging device comprises a pull button and a biasing device. The pull button is moveable from an unlocked position at the first side of the concave pivotal portion to a locked position at the second side of the concave pivotal portion. The biasing device is disposed at a front end such that when the pull button is at an unlocked position, a gap is formed between a rear end of the pull button and the bottom side of the concave pivotal portion; when the pull button is at a locked position, a front end of the pull button is adapted to engage the first engaging device.

REFERENCES:
patent: 6000302 (1999-12-01), Chiang
patent: 6216567 (2001-04-01), Hu
patent: 6295898 (2001-10-01), Hsieh
patent: 6386075 (2002-05-01), Shiao
patent: 6745650 (2004-06-01), Chang
patent: 6895839 (2005-05-01), Hsien
patent: 2003/0015070 (2003-01-01), Chen

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