Cutlery – Sheathed – Pivoted blade
Patent
1994-11-15
1996-05-14
Payer, Hwei-Siu
Cutlery
Sheathed
Pivoted blade
30155, B26B 102
Patent
active
055156100
ABSTRACT:
A folding knife has a generally elongate blade having a tang portion formed with an integral normally unstressed cantilever spring. A cam pin is provided within the blade receiving space within the handle which is disposed along a curvilinear path defined by a locus of points traveled by a free end of the spring as the blade pivots from the closed to the open positions. The cam pin serves to engage and obstruct the free end of the spring between a first point on the curvilinear path when the blade approaches the open position and a second point on that path when the blade reaches the fully open position. The spring, while obstructed is deflected by the cam pin toward the blade into a gap defined by an end edge of the blade and the spring. Such deflection enables the spring to move past the cam pin. The spring is only stressed when deflected by the cam pin, so that the spring tends to initially resist fully opening the blade and, once the blade is fully open tends to maintain the blade in the open position and resist closure of the blade.
REFERENCES:
patent: 4040181 (1977-08-01), Johnson
patent: 5044079 (1991-09-01), Gibbs
patent: 5093995 (1992-03-01), Jan
patent: 5095624 (1992-03-01), Ennis
patent: 5293690 (1994-03-01), Cassady
Levin Yakov
Polyakova Erika
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