B - Operations – Transporting – 23 – D
Patent
B - Operations, Transporting
23
D
B23D 47/00 (2006.01) B27G 19/04 (2006.01) B27G 19/08 (2006.01)
Patent
CA 2112144
RIVING KNIFE DRIVE MECHANISM FOR A PORTABLE CIRCULAR SAW ABSTRACT OF THE DISCLOSURE A portable circular saw includes motor-and-gear case pivotally supported on a guide shoe by a rear pivot mechanism for rotation about a transverse rear pivot axis, thus allowing for selective adjustment of the blade cutting depth on the opposite side of the shoe. In such an arrangement, the depth of cut setting is increased and decreased when the motor-and-gear case is rotated relative to the shoe in respective first and second directions, while an upper pivotal blade guard, which is mounted on the motor-and-gear case for rotation about the spindle, rotates in opposite rotational directions in response to respective increases and decreases in the depth of cut setting. Cam and cam follower mechanisms are provided for maintaining the riving knife and the blade and shoe in the same relative angular orientation in a fore-and-aft cutting plane regardless of the depth of cut setting. Such riving knife actuation is accomplished by such mechanisms in response to the rotation of the rear-pivoted motor-and-gear case and the corresponding opposite rotation of the front-pivoted upper gear case.
Sauerwein William D.
Stumpf William R.
Black & Decker Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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