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Патент USA US2109107

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Feb. 22, 193s.
Filed April 26, 1937
John R. Edo/fe.
Patented Feb. 22, 1938
rATET orifice
John R. Eadie, Jarvis, Ontario, Canada
Application April 26, 1937, Serial No. 138,955
8 Claims.
The principal objects of this invention are to
facilitate the sharpening of knives such as used
on dry milk machines or other mechanisms where
an elongated blade is employed requiring fre
5 quent sharpening and to provide a form of device
for this purpose which will be readily adjustable
and capable of easy manipulation.
The principal feature of the invention resides
in the novel construction and arrangement of
l0 parts whereby a motor-driven grinder is slidably>
mounted in a frame which is provided with means
to engage the blade to be sharpened in guiding
contact with the fiat face of the grinding wheel
presented in bevel grinding relation to the blade.
In the drawing, Figure l is a perspective view
of a device constructed in accordance with the
present invention.
(Cl. 51-1'l'3)
sharpened, thereby arranging the frame A in pre- v
determined angular relation to the blade.
A frame B formed of a strip of metal bent to
form the side guide portions G and connecting
end portion 'I is slidably arranged within the
frame A, the portions 6 beingparallelly disposed
and arranged in a horizontal plane, while the
portion 'I is disposed in a vertical plane'and re
inforced by the metal strip 'I'.
A strip l! of metal is bent into semi-circular
form intermediate of its length and the ends
bent or
tions I
are connected to the forward ends of the
frame B and the extremities thereof are
arranged to slidably engage the side por
of the frameA in sliding and guiding
Additional guide members 9 in the form of
Figure 2 is a miniature diagrammatic view
showing the blade to be sharpened arranged in
20 its normal operating position.
Figure 3 is a more enlarged diagrammatic
strips of metal are secured to the side members <
Ii of the frame B at the top and bottom to snugly
engage the topI and bottom surfaces of the side
portions I in sliding contact.
view of the arrangement shown in Figure 2,
showing the blade swung outwardly and the
A strip of metal Ill is secured across the side
members 6 of the slidable frame B intermediate
manner in which my grinding device co-operates
of the length thereof and the end portions over- '
25 therewith.
For purposes of illustration I have chosen to
show and describe my improved sharpening de
vice in connection with the drum-scraping‘knife
of a dry milk machine, which, in order to obtain
30 the best results, requires frequent sharpening,
but I am aware that my invention has wider
fields of application an-d may be applied to ad
vantage in the sharpening of elongated blades
or knives employed in different types of ma
35 chines including veneer-cutting machines or
drum freezing machines.
Referring to the illustrated construction, I
have shown a light frame A formed of a length
of strip steel having parallelly-spaced side por
40 tions I disposed in a horizontal plane and con
nected at the rearward end by the portio-n 2
disposed in a Vertical plane and having a rein
forcing strip 2' secured thereto, the forward end
of the side members I being turned angularly
45 upward in the form of a guide connected by a
cross member 3.
A pair of looped metal strips 4 are secured to
the side members I of the frame and extend an
gularly upward and forward having their inter
50 mediate portions curved forwardly and down
wardly and connected by a cross portion or strip
5 which is disposed substantially in the plane of
disposition of the guide portions I', so that they
collectively present guide surfaces adapted to en
gage the surface of the blade E which is to be
lap the side portions I of the frame A in support
ing and guiding contact, while the intermediate
portion is curved downwardly and rearwardly in
semi-circular form to provide a support for a
grinding motor C so that its axis is disposed in
a downwardly and forwardly sloping direction.
A grinding wheel D is mounted on the forward
end of the motor shaft II by means of a sleeve
I2 so that the flat forward end face of the grind
ing wheel is unobstructed for diametrical grind
ing contact with the edge of the blade E. The 35
angular mounting of the motor is such that the
flat grinding face of the grinding wheel D is dis- '
posed in a plane angularly intersecting the plane
of disposition of the guide elements I’ and 5 so
that it will be presented at the desired angle or
bevel to the edge of the blade as determined by
the surface contact of the guide portions I’ and
E with the blade and the upper edge extremity
of the portion 5 may advantageously engage the
underside of the blade-supporting bar E’ in guid
ing contact as the entire device is moved man
ually longitudinally of the blade E.
A spindle I3 is threaded centrally through the
frame portion 2 and reinforcing portion 2’ with
the inner end thereof rotatably engaging the por
tions 'I and l’ of the slidable frame and confined
against axial displacement, a hand wheel I4 be
ing carried at the outer end of the spindle to
rotate the same so that the frame B with the
motor and grinder may be accurately adjusted 55
toward or away from the blade in relation to
the guide portions l' and 5. A coiled compression
spring I5 is here shown arranged between the
hand wheel and the frame portion 2' to friction
ally retain the spindle in its adjusted position.
The semi-circular curvature oi the guide mem
ber 8 permits the grinding wheel to be accom
modated between the end extremities of the slid-A
able frame members 6, while at the same time en
10 suring a firm connection therebetween.
The device is of a simple and inexpensive na
ture, but will greatly facilitate the grinding of
elongated blade members.
What I claim as my invention is:
1. A portable blade-grinding device comprising
interñtting frame members connected to slide
relative to each other in a common plane, one of
said frame members having extension guide
means disposed in a plane angularly intersecting`
20 the aforesaid plane and adapted to engage in
guiding contact with a side surface of the blade
to be ground, a motor driven grinding wheel pre
senting ar substantially ñat grinding face, means
for mounting said motor driven grinding Wheel
in the other of said frames with its flat outer
surface disposed in a plane intersecting the said
second mentioned plane for diametrical bevel
grinding Contact with the edge of the blade, and
means for relatively adjusting said frames.
2. vMeans as claimed in claim 1 in which said
frames include- spaced-apart guide portions be
tween which the grinding wheel is rotatably
mounted, said guide portions being disposed in
a substantially common plane arranged in acute
angular relation to the said grinding face of
the wheel.
3. A portable blade-grinding device comprising
inter-fitting frame members slidably connected
and disposed in a common plane, one of said
40 frame members having guide extensions disposed
in a plane angularly intersecting the aforesaid
plane for guiding contact with the blade to be
ground, a grinding wheel rotatably mounted in
` the> other of said framesy presenting a flat outer
surface for diametrical bevel-grinding contact
with the edge of the blade, the axis of said grind
ing wheel being disposed in a plane angularly in
tersecting the plane of disposition of said frame
and the plane of disposition of said blade-engag
ing guide means, means for slidably adjusting
said grinder-carrying frame in the other frame,
and means for rotating said grinding wheel.
4. A portable blade-grinding device comprising
a pair of frame members formed of strips of
metal bent into substantial U-shape form having
the side portions arranged in parallel sliding con
tact, the end extremities of one of said frames
being turned angularly upward to engage the
blade in guiding contact, threaded adjusting
means interposed between the transverse por
tions of said U-shaped frames: for slidably ad
justing the same, and a motor grinder supported
between the side portions ofthe other of said 10
U-shaped frames, said motor grinder including
a grinding wheel having aside grinding face, the
angular relation of said blade-guided portions of
the frame and said side grinding face being such
that the said motor grinder will be positioned 15
with said side-grinding face in grinding contact
with the edge portion of the blade.
5. A device as claimed in claim 4, in which
guide members are secured to- the side members
of the first-mentioned U-shaped frame interme 20
diate of the length thereof and are looped above
the grinding element and extend forwardly and
downwardly and carry a guide portion, for guid
ing contact with the blade.
6. A device as claimed in claim 4 in which a
strip of metal is secured in bridging relation
to the end extremities of the second-mentioned
U-shaped frame and engages the side members
of the first-mentioned frame in guiding con
tact, the intermediate portion of said metal strip 30
being disposed in semi-circular formation to pro
vide accommodation of the grinding wheel be
tween the end extremities of the second-men
tioned frame.
7. A device as claimed in claim 4 in which a 35
strip of metal extends transversely of the frames
intermediate of their length on which the motor
grinder unit is supported, said metal strip being
secured at its ends to the side portions of one of
said frames and engaging the side portions of 40
the other frame in guiding and support contact.
8. A portable grinding device expressly forI the
bevelled grinding of a wide flat blade compris
ing, a frame, a motor mounted on said frame,
a grinding wheel mounted on the shaft of said 45
mo-tor and having a flat grinding face, and means
extending angularly from said frame in a plane
intersecting the axis of said grinding wheel
adapted to engage in sliding Contact with the
Wide flat face of the blade to hold the flat grind 50
ing ’face of said grinding wheel in bevelled grind
ing relation to said blade.
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