Safety interlocking blade release mechanism for hand held cuttin

Details Safety interlocking blade release mechanism for hand held cuttin Safety interlocking blade release mechanism for hand held cuttin

1998-07-27

2000-04-04

Watts, Douglas D.

Cutlery

Sheathed

Sliding blade

30 2, B26B 108

Patent

active

060445629

ABSTRACT:
An improved safety knife which has a hollow body and a blade which is normally retracted within the knife, but can be extended by urging the operating lever (26) down and forward. The lever is connected to the blade carriage near the aft end of a leaf bias beam (24). A sear, protruding inward, at the far aft end of said leaf bias beam serves to interlock the blade and carriage in the cutting position. Upon sensing pressure of the cut, blade carriage pivots at the pivot point (22), causing the sear (28) to disengage from interlock.
At this point, blade and carriage are free to retract into sheathed position within the body. This retraction takes place at the termination of cut, when cutting drag is diminished and knife accelerates towards user.

REFERENCES:
patent: 2874462 (1959-02-01), Benedict
patent: 2885779 (1959-05-01), Newkirk
patent: 3176395 (1965-04-01), Warner et al.
patent: 3577637 (1971-05-01), Braginetz
patent: 4242795 (1981-01-01), Rollband et al.
patent: 4265017 (1981-05-01), Collins
patent: 4867985 (1989-09-01), Rehm
patent: 4897920 (1990-02-01), Dunbar
patent: 5617635 (1997-04-01), Berns

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