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Патент USA US2404025

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July 16, 1946.
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J_ |__ BARNES
KNIFE SHARPENER
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2,404,025.
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Filed 061;. 6, 1944
14‘
A‘
llilll l HM
INVENTOR.
Jase/v71 L. Barnes
Patented July 16, 1946
2,404,025
UNITED STAT ES PATENT OFFICE
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2,404,025’
KNIFE SHARPENER
Joseph L. Barnes, Indianapolis, Ind.
Application October 6, 1944, Serial No. 557,427
5 Claims. (Cl. 76—86)
1
My present invention relates to a knife
sharpener of the kind having a pair of rotary ?les
between which the knife blade may be drawn for
2
the balls contact each other.
With respect to
those types of sharpeners having rotary ?les pro
vided with three ?les instead of two, my arrange
ment eliminates the necessity of the third ?le.
The teeth I8 may be considered as cutting in
One object of the invention is to provide a knife
one direction, that is when the knife is drawn
sharpener of simple, durable and inexpensive con
downwardly in Figure 3. I provide a wedge-like
struction comprising a base and a pair of rotary
stop or holding pawl 24 coacting with the ?les
?les or other suitable abrasives, mounted thereon.
which is spring-pressed downwardly in Figure 3
Another object is to provide a means to permit
rotation of the ?les in one direction and prevent 10 by a spring 26. The stop 24 ?oats on a pin 28
extending upwardly from the base l0 and, accord
their rotation in the other direction as a knife
ingly, as the knife is drawn toward the user, the
blade is reciprocated between them.
stop wedges in between the rotary ?les and they
Still another object is to provide a knife
sharpening it.
sharpener which can be easily used by any un
are held so that their cutting teeth l8 act upon
skilled person and operated merely by a recipro 15 the knife to sharpen it. When the knife is pushed
away from the user, the friction between the
cating motion of the knife blade while held be
knife and the ?les will rotate the ?les (clockwise
tween a ‘pair of rotary ?les.
for the right hand one and counter-clockwise
With these and other objects in view, my inven
for the left hand one), this being permitted by
tion consists in the construction, arrangement
and combination of the various parts of my device 20 the holding pawl 24 backing up due to such rota
tion. Thus the teeth 13 act only when the direc
whereby the objects contemplated are attained,
tion of travel of the knife blade relative to them
as hereinafter more fully set forth, pointed out in
my claims and illustrated in the accompanying
is such that they can cut metal therefrom, and
the device is automatically operable with only
drawing, wherein:
Figure 1 is a plan view of a knife sharpener 25 the requirement that the knife blade 22 be held
embodying my invention and showing in dotted
down between the ?les and reciprocated.
lines the relation of a knife thereto while being
Abrasives other than ?les such as carborundum
sharpened.
or the like may be employed and other changes
Figure 2 is a front elevation of the knife
may be made in the construction and arrange
sharpener showing a knife blade in section, and 30 ment of the parts of my device without departing
Figure 3 is an enlarged sectional view on the
from the real spirit and purpose of my invention,
line 3—3 of Figure 2.
and it is my intention to cover by my claims any
On the accompanying drawing I have used the
modi?ed forms of structure or use of mechanical
reference numeral ill to indicate a base which is
equivalents which may be reasonably included
preferably rigidly mounted on a table or cabinet 35 within their scope without sacri?cing any of the
top as by countersunk screws I2.
advantages thereof,
The‘base it has a pair of shoulder rivets l4
I claim as my invention:
extending upwardly therefrom which are peened
1. In a knife sharpener of the character dis
as at [B to retain them in position. On each rivet
a rotary ?le I6 is journalled. The shouldered 40 closed, a base, a pair of rotary abrasive elements
thereon, said abrasive elements being shaped as
character of the rivets prevents any binding of the
frustums of cones and having intermeshing teeth
?les and permits them to rotate freely.
at their lower edges, and wedge means for permit
The ?les I6 are provided with teeth It as illus
ting rotation of said abrasive elements in one
trated in Figure 3 and the teeth of one ?le point
clockwise while those on the other point counter 45 direction and preventing their rotation in the
opposite direction, said wedge means being con
clockwise. The ?les l6 are in the shape of cone
strained to wedging position between said abrasive
frustums to bevel the sides of a knife blade as
elements.
indicated at t8, the blade itself being designated
2. A knife sharpener comprising a base, a pair
20.‘ The teeth i8 as will be noted in Figure 3
mesh with each other so that there is an over 50 of frustum shaped rotary abrasive elements
thereon. having teeth meshing with each other at
lapping of the peripheries of the ?les at their
the bases of the frustums, and a holding pawl
lower ends as shown in Figure 2, thus presenting
spring urged to wedgebetween said elements and
?le faces entirely down to the lower sharp edge
stop their rotation as a knife blade is drawn be
of the knife blade. This eliminates the “wire”
edge caused by ball types of sharpeners wherein 55 tween them and to release and permit their rota
2,404,025
3
4
tion as the knife blade is pushed in the opposite
direction.
3. A knife sharpener comprising a pair of
ments for permitting of their rotation in one
direction and preventing their rotation in the
opposite direction.
frustum shaped rotary abrasive elements having
5. A knife sharpener comprising a base, a pair
teeth meshing with each other at the bases of the
of frustum cone shaped rotary abrasive elements
thereon, and a holding pawl spring urged to wedge
between said elements and stop their rotation as
a knife blade is reciprocated between them in one
frustums, and a. holding pawl to wedge between
said elements and stop their rotation as a knife
blade is drawn between them.
4. In a knife sharpener of the character dis
closed, a pair of rotary abrasive elements, said
elements being frustum cone shaped, and a wedge
biased to frictionally engage between said ele
direction and to release and permit their rotation
as the knife blade is reciprocated between them
in the opposite direction.
JOSEPH L. BARNES.
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