Releasable separate member latching device for a portable hand t

Details Releasable separate member latching device for a portable hand t Releasable separate member latching device for a portable hand t

1985-05-07

1987-09-15

Kazenske, E. R.

Cutlery

Cutting tools

Saw

30391, 30388, 83478, 83546, B23D 4516

Patent

active

046930086

ABSTRACT:
A releasable latching device (32) for a portable circular power saw (10) includes a pivotable latch member (32) for releasably latching or locking a guard member (22) for a rotary saw blade (20) in a guarding position, to preclude serious injury to an operator during use of the saw. The latch member (34) includes a hook (44) engagable in a first retaining notch (46) or a second retaining notch (50) in a hub (48) of the guard member (22) for this purpose, depending upon whether the saw (10) is being used to make a straight cut or a 45.degree. cut. The latch member (34) is retained in a latching positon by a spring biased push rod (52) and is moved to an unlatching position by operation of the push rod. A permanent magnet (64) on the latch member then cooperates with a ferromagnetic strip (66) on the hub (48) of the guard member (22) to temporarily retain the latch member in its unlatched position as the guard member is rotated to an unguarding position by an article during a sawing operation, after which the permanent magnet and ferromagnetic strip disengage such that the latch member will automatically be returned to its latching position when the guard member is returned to its guarding position upon completion of the sawing operation.

REFERENCES:
patent: 2926709 (1960-03-01), Kaley
patent: 3701369 (1972-10-01), Gronke et al.
patent: 4176571 (1979-12-01), Batson

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