Hand-held circular saw with alignment features for...

Details Hand-held circular saw with alignment features for... Hand-held circular saw with alignment features for...

2008-04-07

2010-11-30

Choi, Stephen (Department: 3724)

Cutlery

Cutting tools

Saw

C030S388000

Reexamination Certificate

active

07841092

ABSTRACT:
A hand-held circular saw designed for making square cuts on workpieces. The saw is equipped with a pair of retractable guide pins located near the rear of the blade; when both pins touch the front edge of the workpiece the saw's blade is automatically perpendicular to it. The saw is also equipped with at least one torsion spring that temporarily holds the saw's blade above the workpiece. Without moving the saw's base, the user turns on the saw, and pressing downwardly on its handle, lowers the blade into the workpiece, making a square cut with the accuracy of a cut-off saw. The guide pins can also be automatically or manually retracted to convert the improved saw back to a conventional saw.

REFERENCES:
patent: 4730396 (1988-03-01), Nishioka
patent: 4777726 (1988-10-01), Flowers
patent: 5561907 (1996-10-01), Campbell et al.
patent: 2005/0278960 (2005-12-01), Niwa

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