Blade pushing device of cutting knives

Details Blade pushing device of cutting knives Blade pushing device of cutting knives

2002-12-17

2004-06-08

Goodman, Charles (Department: 3724)

Cutlery

Sheathed

Sliding blade

C030S335000

Reexamination Certificate

active

06745474

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a blade pushing device of a cutting knife wherein the spring member has two ends contacting against two insides of the body member so as to prevent the spring member from being fatigue fast.
BACKGROUND OF THE INVENTION
A conventional cutting knife
10
is shown in
FIGS. 1 and 2
and in U.S. Pat. No. 6,226,873. A slider
13
is slidably engaged with the slot
111
of the holder
11
. A blade
12
is connected to the base plate, of the slider
13
and a leaf spring
133
is received in a chamber
131
A of a body member
131
of the slider
13
. The leaf spring
133
includes a protrusion
133
A that retractably extends through a notch of the body member
131
so as to be engaged with one of the recesses
111
A defined in the inside of the slot
111
. An operation member
132
is movably mounted to the body member
131
and has a wedge-shaped notch
132
A which may push the protrusion
133
A of the leaf spring
133
downward to disengage the protrusion
133
A from the recess
111
A so that the blade
12
can be moved till the protrusion
133
A is engaged with another recess
111
A. The two ends of the leaf spring
133
have no stop means to limit their deformation and shifting so that the deformation of the leaf spring
133
is not under control and this makes the leaf spring
133
to reach its limitation of fatigue more quickly than expected.
The present invention intends to provide an improved blade pushing device for a cutting knife and the two ends of the spring member are stopped by two insides of the body such that the deformation of the spring member can be well controlled.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a cutting knife that has a spring member received in a base member which is slidably engaged with the slot in the holder, a spring is biased between an inside of the wall and the reverse side of the protrusion of the spring member so as to provide a force to engage the protrusions with one of the recesses defined in one of two sides of the slot.
Another object of the present invention is to provide a cutting knife wherein the spring member has two end portions which contact against the insides of the wall so as to limit the deformation n of the spring member when the protrusion of the spring member is pushed to disengage from the opening of the wall of the base member.


REFERENCES:
patent: 2722914 (1955-11-01), Aversa
patent: 3863339 (1975-02-01), Reaney et al.
patent: 4103421 (1978-08-01), Quenot
patent: 4170062 (1979-10-01), Machida
patent: 4322885 (1982-04-01), Osada
patent: 4558517 (1985-12-01), Gringer
patent: 5269063 (1993-12-01), Okada
patent: 5502896 (1996-04-01), Chen
patent: 5531754 (1996-07-01), Shackelford et al.
patent: 5774994 (1998-07-01), Stein et al.
patent: 6006433 (1999-12-01), Baltazar
patent: 6226873 (2001-05-01), Okumura
patent: 6254621 (2001-07-01), Shackelford et al.

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