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Патент USA US2124646

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July 26, 1938.
G. BARSCH
2,124,646
KNIFE SHARPENING DEVICE
Filed Feb. 8, 1936
’ 2 Shéets-Sheet 1
July 26, 1938.
G. BARSCH
2,124,646
KNIFE 'SHARPENING DEVICE
Filed Feb. 8, 1936
2 Sheets-Sheet 2
2
A
I
Gu/ '//au‘rne 60/3017“,
Patented July 26, 1938
2,124,546
UNITED STATES PATENT
FFEQE
2,124,646
KNIFE SHARPENING DEVICE
Guillaume Barsch, Paris, France, assignor to In
dustrie A. G. Allegro, Emmenbrucke, Switzer
land
'Application February 8, 1936, Serial No. 63,016
In Germany February 11, 1935
7 Claims.
The present invention relates to knife sharp
eners.
_
'
'
The principal object of the invention is to
provide a knife sharpener which will sharpen
5 knife blades with uniform eniciency, and which
is readily adaptable for knife blades of varying
Widths.
Other objects and advantages of the invention
Will be apparent from the following drawings
wherein,
Figure 1 is a side elevation of a knife sharpener
constructed in accordance with my invention,
portions of the base being broken away; ,
Figure 2 is a plan view of the knife sharpener
15 of Figure 1;
Figure 3 is a view similar to Figure 1 showing
the knife sharpener in use;
Figure 4 is a side view of a modi?ed form of
knife sharpener;
Figure 5 is a plan view of the knife sharpener
of Figure 4;
Figure 6 is a detailed side elevation showing
the position of the sharpeningv elements of the
Figure 4 device, and
Figure 7 is an end view of the blade supporting
element used in the Figure 4 construction.
Referring to Figures 1 to 3, the knife sharp-v
ening device there illustrated comprises a base
(Cl. 51-214)
the base or support I, this slot being properly
centered between the pivot points 6 and 6a. , A
knife supporting element l having the form of
an eccentrically mounted roller is positioned in
the slot, the element 1 being rotatably mounted
by means of journals carried thereby which ex
tend into sockets 3 on the opposing faces of the
slot. The periphery of the roller 1 may be covered
with rubber, felt or the like.
If desired, the pivot points 6 and 6a may be 10
positioned above the point shown on Figure 1,
in which case the grinding surfaces of the stones
5 and 5a would be convex instead of concave;
By the arrangement shown in Figures 1 to 3,
a knife blade, indicated by the numeral [8 in
Figure 3, may be inserted between the grind
stones 5 and 5a, the back of the blade resting
upon the eccentrically mounted roller 1 and the
springs 3 and 3a holding thesurfaces of the
grindstones pressed against the cutting edge of
the blade with uniform pressure. As the knife
blade is moved transversely between the stones,
it will be moved vertically by the rotation of the
supporting roller 7 upon its eccentrically posi
tioned journals, these two motions resulting in
a wave line producing a diagonal. grinding mo
tion which has the most effective sharpening ac
or support I which may be formed of wood or the
tion, with the advantage that the sharpening
takes place along constantly changing generat
like and which is provided with two relatively
offset cutout portions la extending longitudinally
ing lines of the sharpening surfaces, thereby pre
venting the edge of the blade from cutting into
thereof and each terminating at a point adjacent
the median line of the base. Plates 2 and 2a are
positioned on the upper side of the base I, each
3 of the plates covering one of the cut-out portions
the stones.
It will be observed that the provision of concave
faces upon the grindstones and the spring mount
ing thereof will cause the stones to act at the same
la. The plates are respectively provided at their
inner ends with pivots 6 and 6a to support grind
stone holding elements 4 and 4a respectively.
Above the pivot points 6 and 6a, the holding
tie 0 elements have ?xed therein oppositely facing
grindstones 5 and 5a. The grinding surfaces of
angle with respect to any knife blade presented
between the same, regardless of the width of the
blade.
Referring to Figures 4 to '7, the form of my
device disclosed therein comprises a base or sup
port H having a suitable housing l2 of sheet
metal or the like secured to its upper portion. The
the stones are concaved as shown in Figure 1 in
order that the angle of the stones with respect to
the edge of the blade presented therebetween
<15 will always be the same. Beneath the pivot
points, the grindstone holding elements 4 and 4a
have springs 3 and 3a, respectively, connected
thereto, the outer ends of the springs being con
nected to depending angled portions on the plates
50 2 and 2a. By this arrangement, the stone hold
ing elements and the stones themselves will be
tilted to the position shown in Figure l to thereby
exert a proper pressure against a knife blade
positioned between the stones.
A slot or kerf 9 extends transversely through
housing i2 encloses grindstone holding elements
i 3, which are arranged parallel but offset with
respect to each other. Grindstone elements l4
are mounted upon the opposing or inner faces of
the holding elements l3, as shown in Figures 4
and 6, the‘stones overlapping opposite a slot l5
provided in each side wall of the housing 52. The
grindstone holding elements 13 are tilted to the 50
position shown in Figure 4 by a coil spring l5
arranged within a rib ll extending longitudinally
of the top of the housing, the ends of the spring
being secured to the free ends of blades 58 having
their lower ends pivotally connected to the base 55
2
2,124,646
l l. Intermediate their ends, the blades l8 are
provided with offset portions l 9 which bear upon
3. The combination in a blade sharpening de
vice, of a base, a grinding element slidable in a
the rear faces of the grindstone holding elements
predetermined direction with respect to said base
IS, the entire arrangement being such that both
C21 elements will be uniformly pressed toward each
and having a grinding face inclined with respect
to said base, and a blade supporting element ro
tatably mounted in said base to movably support
a blade in angled contact with thegrinding face
other.
.
In order to permit the holding elements to be
moved apart to permit of the insertion of a knife
blade between the same, each holding element is
10 provided with a tang 20 which projects through
' an aperture in the upper wall of the housing 12.
Pressure upon the tangs 20 in the direction of the
arrows shown in Figure 5 will obviously cause the
grindstones I4 to be moved apart.
15
'
A slot or kerf 22 is provided in the base II in
alignment with the slots I2 in the housing so
that a knife may be readily presented to the
grindstones. An eccentrically mounted roller 23
is positioned in the slot 22, and in order to enable
20 this roller to be positioned at varying distances
with respect to the grindstones M, a plurality of
sockets 24 open from the near edge of the base I l,
as seen in Figure 4, these sockets being adapted
to selectively receive the eccentrically positioned
A plate 26 is slid
ably secured to the same side face of the base II,
this plate being provided with a vertically ex
25 journals 25 of the roller 23.
' tending slot 21 having horizontal slots 28 open
ing therefrom and substantially corresponding
30 in size with the sockets 24.
When the plate 26
is in the position shown in Figure 4, the slots 28
of the plate will be out of alignment with the
sockets 24 but when the plate is raised, the slots
and sockets will be in alignment so that the roller
23 may be positioned as desired and in accord
of said grinding element, said supporting element
being mounted to have an eccentric movement
10
with respect to said grinding element.
4. The combination in a blade sharpening de
vice, of a base, a grinding element pivoted on said
base for swinging movement in a predetermined
direction with respect to said base and having
a grinding face inclined with respect to said base,
and a blade supporting element rotatablymounted
in said base to movably support a blade in an
gled contact with the grinding face of said grind
ing element, said supporting element being
mounted to have an eccentric movement with
respect to said grinding element.
5. The combination in'a blade sharpening de
vice, of a base, a pair of grinding elements mov
able relative to each other and in a predeter
mined direction with respect to said base and
having opposed grinding faces inclined with re
spect to said base, and means to support a blade
in angled contact with the grinding faces of said
elements and to bodily move the blade longi
tudinally of the grinding faces of said grinding Ill)
elements, said means also functioning to simul
taneously move the blade in a plane substantially
at right angles to the direction of movement of
said grinding elements to move said grinding
elements along their path of movement.
6. The combination in a blade sharpening de- ‘
The roller. 23 preferably has its pe- ' vice, of a base, a pair of grinding elements mov
ancewith the thickness of the knife blade to be
sharpened.
riphery covered with‘ rubber, felt or the like. The
construction as shown in Figures 4-7 thereby pro
vides a device which may be readily adapted to
40 handle knife blades of varying widths.
It will be observed that both forms of my in
vention include the means to reciprocate a knife
blade vertically while it is being moved between
the grindstone elements, and that both devices
are readily adjustable for knife blades of various
widths, but will nevertheless exert grinding pres
sure upon the knife edge at a uniformv angle,
60
regardless of the width of the blade being sharp
ened between the stones.
I claim:
1. In a knife sharpening device, the combina
tion of a base and a grinding element, and means
to support a knife in moving contact with said
element comprising a roller journaled on said
55 base for rotation during movement of the knife,
said roller being eccentrically mounted on its
journal.
60
'
"
2. The combination in a blade sharpening de
vice, of a base, a grinding element movable in a
predetermined direction with respect to said base
and having a grinding face inclined with respect
to said base, and a blade supporting element ro
65
tatably mounted in said base to movably support
a blade in angled contact with the grinding face
of said grinding element, said supporting element
being mounted to have an eccentric movement
with respect to said grinding element.
able relative to each other and in a predeter
mined direction with respect to said base and
having opposed grinding faces inclined with re 40
spect to said base, means to support a blade in
angled contact with the grinding faces of said
elements and to bodily move the blade longi
tudinally of the grinding faces of said grinding
elements, said means also functioning to simul 45
taneously move the blade in a plane substantially
at right angles to the direction of movement of
said grinding elements to move said grinding
elements along their path of movement, and resil
ient means tending said grinding elements toward 50
the blade supporting means.
. 7. The combination in a blade sharpening de
vice, of a base, a grinding element movable in a
predetermined direction with respect to said base ,
and having a grinding face inclined with respect
to said base, means rotatably mounted in said
,base to support a blade in angled contact with
the grinding face of said element, said support-‘
ing means being so mounted in said base that
upon rotation thereof it will bodily move the
knife longitudinally of the grinding face of said
grinding element and in a direction substantially
at right‘angles to the direction of movement of
said grinding element to move said grinding ele
ment along its path of movement.
GUILLAUME BARSCH.
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