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Патент USA US2124593

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July 26, 1938.
Filed Jan. 8, 1937
v 2,124,593
3 Sheets-Sheet l
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' July 26,_ 1938.
\ Filed Jan. 8, 1937
3 Sheets-Sheet 2
B $140.; Agééaey?er
July 26, 1938.
_ 2,124,593
Filed Jan. 8, 1957‘
3 Sheets-‘Shed. 3
_V/¢ / \.A \
vPatented July 26, 1938
1 2,124,593‘
Adolph 0. Sohaefer, Brooklyn, N. Y., assignor to
Atlantic Service Company, Ind, Brooklyn,
kN. Y., a corporation of New York
1 Application January 8, 1931, Serial No. 119,547
5 Claims.
(01. 51-140)
This invention relates to grinding machines
and is adapted for grinding edged tools. An ob
ject of the invention is to provide an abrasive belt‘
for grinding the tool with a tool holder adjustably
5v positioned relative to the belt. Another object
of the invention is to provide a pair of abrasive
belts angularly disposed relative to each other
with a tool holder for positioning the tool in the
grinding position for each belt. Another object
10. of the invention is to provide an enclosed frame
or housing for the abrasive belt, pivotally mount
ed on a sleeve which forms the bearing for the
mechanism operating the abrasive belt. Other
objects of the invention will be more particularly
l5: understood from the following speci?cation and
from the accompanying drawings, selected to
show one form of the invention, and in which
Fig. 1 is a front elevation of the grinding ma
chine complete;
Fig. 2 is a rear elevation of the machine with
the driving motor removed;
Fig. 3 is a sectional elevation on line 3--3,
Fig. 2;
Fig. 4 is a top plan view of the tool holder;
Fig. 5 is an end view from the rear of the tool
Fig. 6 is an end view from the front of the tool
holder, and
Fig. '7 is a diagram showing the relation of the '
30'. tool holder, the tools, and the grinding belts;
‘This application relates to the same type of
machine as my co-pending application 92,272,
?led July 24, 1936, for Tool grinders. It com
prises a base supporting a motor with a drive’
35; mechanism and a vertical bearing plate against
which the enclosed frames of the abrasive’belts
are pivotally mounted so that the angular posi
tion of the belts may be adjusted. A tool holder
is provided between the frames and opposite an
401i exposed portion of the abrasive belts. This hold;
er is adjustably clamped ‘to the bearing plate
so that its elevation can be adjusted to suit the
angular position of the belts. The tool holder
comprises a triangular shaped member located
45 between the frames, having a head at one end
by which it is secured to the bearing plate. This
member is provided with a vertical slot opposite
each of the abrasive belts. The knife or tool to
be ground is inserted in the slot until it engages
50 the abrasive belt which grinds it on one side and
then it is transferred to the opposite slot where
the opposite abrasive belt grinds it on the other
side. The central member of the tool holder is
recessed or tapered to an edge opposite the belts
55 so as to provide ample clearance for the belts.
The central member of the tool holder is provided
with parallel sides at the front and at the back
so that the tool is held vertical during the grind
ing operation. The front end of the tool holder
is provided with a removable plate which forms Ol
the parallel sides of the ‘central member and
against which the tool bears in operation.
In the drawings, II is the base which supports
the motor I5 and the pad I2‘ upon which the
bearing member 22 and the drive mechanism 10
cover 23 is mounted.’ The frame I3 is pivoted
to the bearing plate 22 on the-axis 26 and the
frame I4 'ispivoted in the same Way, on the axis
29. The'framesv I3 and I4 are provided with an
enclosing ‘cover 10 secured by nut I3 on the stem 15
69-. ‘The tool holder is indicated at 26, Fig. 1,
located between frames I3 and I4 and an index
member-1s provided at I8 on the pad I2 with
registering index marks 0 on I3 and I4 whereby
the'angular position of bothframes may be ad 20
justed to correspond ‘with each other.
The frame I'll, Fig.’ 3,- is mounted against the
vertical'plate 22 on the sleeve bearing 62 which
has a ?ange at 63 and is mounted in an aperture
in the‘ gear housing 23' and is secured in place by 25
the stud bolts 64. The plate 22 is provided with
an arcuate slot at 25 with a stud engaging the
clamping nut v2'I whereby the frame is clamped
in" the position desired after it‘ is adjusted on
the bearing 62. Thefram‘eiis provided with an 30
idler roller‘6l, mounted'on shaft 68 and support
ed byiarm' 30» on the bolt13I. ‘The arm 35 has a
free vertical movement in‘which 68 moves in slot
333'and aspring 34'is'provi'ded to normally raise
the arm.- This arm‘may-b'elowered and latched 35
in the lower position by the cam‘ 3'! pivoted at
36 to the arm 30'and‘arrange'd ‘to engage the stop
35 when'the handle 38~is moved upwards. The
frames I3 and I4 are provided with similar mech
anisms, the corresponding parts being distin
guished by a prime mark, and the slot 28 corre
sponds with the slot 25.
The motor shaft is connected through the cou
pler I6, H, with the drive shaft 52, carrying the
spiral gear 53, Fig. 3, engaging the spiral gear 54, 45
secured to shaft 55 by nut 56 and running in the
sleeve bearing 62 and the end bearing 26. The
belt wheel 58 is mounted at 51 on a reduced sec
tion of shaft 55 and is secured in place by the nut
59. A drive pin 60 projects from shaft 55 and 50
engages the recess'BI on the face of pulley 58,
thereby insuring a positive drive for this pulley
from the driving shaft 52. The pulley 58 is pro
vided with a rubber tire‘ 66, preferably of com
paratively soft rubber to provide the adhesion
j 2,124,593
necessary for driving the abrasive belt which
securing it in place, having a recess for the belt
and having a removable plate at the opposite end
for holding the tool in position in the slot to en
runs between this pulley and the idle pulley 61.
The shaft 52, Fig. 2, is provided with separate
spiral'gears for the drive pulley 58 in the frames
~ I3 and [4, the end bearings of which are indicated
2. A tool holder for holding a tool to a grinding
at 26 and 29, the construction being similar to
that in Fig. 3. The mechanism is made in two
belt comprising an integral member extending
separate parts which are. divisible'on the centre
thereingwith parallel sidesto, engage both sides
of'the tool in the grinding position, and providing
across the face of the belt, and having a slot
line of shaft 52 as indicated by the line between
the parts I! and 23.‘
for the free transverse movement of the tool said
The tool holder is preferably made from a sin-_ . slot being angularly disposed with reference to .10
gle casting having a central member 15 and two‘ ' the belt, said member having a head at one end
. outside members 76 and 11, forming the vertical ,
slots 82 and 83 to receive the tool. The device
15 is provided with a head at the attaching end
by which‘it is adjustably secured with reference
to the belt and having a removable plate at the
comprising the wings 18 and 19, provided with ', opposite end outside the plane of thebelt con 15
the slots 84 and 85 which clamp against the plate . forming to'ithe side of the slot opposite the belt.
3. A ‘tool holder for holding tools to a-pair of
22 by the clamping screws 8'! an_d_88. Pads are angularly disposed grinding belts comprising an
formed in the casting at 88 to strengthen the
integral member extending across the face of the
20 side members of the tool holder where they at
belts and angularly shaped to conform to the po
tach to the central member below the slots. The sition of the belts, and having a vertical slot for 20
central member is tapered as indicated at 86 the tool opposite each belt said slots being par
towards the apex of the belts so that the contour
allel and extending through said holder and 'en
of this member, with the outer faces of 16 and
both sides of the tool in the grinding po
25 '51, form a triangular structure which is inter
providing for the free transverse 25
cepted by the vertical slots 82 and 83. The abra
movement of the tool, the central member of
sive belts move opposite the tool holder and be
tween the positions indicated by lines (1 and e. said holder being "recessed opposite said belts to
clear the belts and means conforming to the wall
'Fig. 4. '
of the slots. . for rigidly supporting the tool
30; " The tool a Fig. 7, is inserted in'slot 82 until the
against‘the belts at the ends of the holder.
edge engages the abrasive belt 1| and in this po
sition the"v tool is moved back and forth, during
the grinding operation. After one side is ground
in this way the tool is transferred to slot 83 as
indicated at b and the oppositeside is engaged
by the abrasive belt 14 running onthe idler pul—_
ley 13.
It will be noted that the pressure between the
grinding edgeand the abrasive belt is taken up
40 by the central member 15 of the tool holder and
in order that the tool may not be de?ectedfrom
its position where the central member is recessed
at 86, the slots 82 and 83, Fig. 5, are parallel and
the other end of the central member 15 is pro
45 vided with a plate 8|, secured thereto by screws
whose sides are parallel and correspond with the
central member at the opposite end. This holds
the blade rigid and vertical during the grinding
operation and in the same position?with respect:
50 to both belts.- The plate BI is made detachable
each pair of rollers,v,.said frames being placed
against said plateand solely supported thereby,
1. A tool holder for holding a tool to a- grinding‘
60 across the face of the belt and having a slot
therein engaging both sides of the tool in the
grinding position, and providing for the free
transverse movement of the’ tool said member
having wings at one end as the only means for
a driving shaft mounted inthe base having a
pair of spiral gears, a drive shaft for one of each
pair of rollers, each having a spiral gear engag
ing one of the spiral gears of the drive‘shaft to
drive the belts, a sleevebearing with a ?ange for
each roller drive shaft and mounted in‘ register- '
ing apertures in the frame-and in the plate withgi
the flange engaging the frame to hold it‘, against
the plate and clampingthe frame to the plate 451
to pivot about the axis of the roller, an arcuate
slot insaid vertical plate and a stud in said slot
for clamping the frame in position against said:
5. A machine for grinding knives and the like
comprising a base with a ‘motor thereon, a hori-.
so that'it may be easily‘replaced asit' wears
away, and so that it 'may be made of harder ma- , Zontal shaft withspiral gears driven by saidrmoe
terial than the tool holder itself.
tor, a removable cover for said base enclosing said
' This invention admits 'of-applications other gears and having. a vertical plate thereon, a pair
than those shown and which are fully contem~ of frames pivotally. mounted against said plate
plated'in the appended claims.
and solely supported thereby, an abrasive belt
Having thus described my invention, I claim: 8 in each frame,_ a drive roller for each belt;v a shaft
belt'comprising an integral member extending
4; A machine for grinding knives and the like
comprising, a base having a gear box and a single
vertical plate,v a pair of frames each having a
pair of-v rollers and an abrasive belt mounted on
55.1 .
for each drive roller extending into the cover at
right angles to the horizontal shaft and having;
a gear engaging one of the gears on the. horizontal
shaft, means for securing said cover to said base
and means-for clamping said frames to said ver
tical plate.
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