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Патент USA US3087294

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April 30, 1963
Filed Sept. 26. 1960
3 Sheets-Sheet 1
' ‘8.
April 30, 1963
Filed Sept. 26. 1960
3 Sheets-Sheet 2
April 30, 1963
Filed Sept. 26. 1960
3 Sheets-Sheet 3
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1 MW‘ 28
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United States Patent 01
Patented Apr. 30, 1963
of grinds are made. An effort is made to obtain the best
chip clearance and face obtainable from observation.
The result is dependent on the skill of the grinding op
erator, and at best is formed by a series of faces which
‘affect the e?iciency of the cutting-tool. The ?xture de
scribed below reduces the grinding operation to a simple
face and continuous chip clearance of even, preselected
Harry A. Rombold, 2143 Woodlawn Ave, Glenside, Pa.
Filed Sept. 26, 1960, Ser. No. 58,393
1 Claim. (Cl. 51-225)
depth and angles greatly increasing the milling tool ef
This invention relates to improvements in grinding
machinery in general, and speci?cally to improvements in
Referring now to the drawing and particularly to FIG
cutting tool holding devices which cooperate with such 10
URE l, a typical grinding tool 10 is shown, mounting
grinding machinery.
the head 12 or" the invention in operating relation with
The relative positions of the cutting-tool to be ground
grinding wheel 14, protected by a guard or cover 16‘. A
or dressed and the grinding element of the machine usu
motor mount 18 to drive the grinding Wheel 14 may be
ally determines the result of the grinding operation. In
a cutting-tool gumming operation, for example, when a 15 moved into position with the Work piece, shown here
by the number 2@‘, as by a transverse traversing screw,
chip clearance channel of uniform depth and even sur
face is required, both position and continuity of the
grinding operation determine the resulting et?ciency of
the ground tool. An important object of the present
invention is therefore to provide a cutting-tool holding 20
?xture that has novel means for adjustably positioning
the cutting-tool to be ground or dressed in angular rela
tion to the selected operating surfaces of the grinding
not shown but operated by hand wheel 22. A longi
tudinally traversing screw, also unseen, is operated by
hand wheel 24 to position the motor mount 16 at the
proper longitudinal position on bed 26. A power table
traverse moves table 28‘ into and away from contact
with grinding wheel 14.
Control ‘lever 30 controls
the table movement.
The movable table 28 is adapted to support and hold
And yet a further object is to provide a cutting-tool 25 head 12, and the contained work-piece 20, in predeter
holding ?xture that can be adjustably positioned relative
to the grinding element to produce the best grinding
operation for the e?iciency of the said cutting-tool with
greater ease, speed and precision than has been previous
ly possible.
A further object is to provide a cutting-tool holding
?xture in which a cutting-tool can be securely fastened,
adjusted and indexed for repeated, accurate grinding op
mined relation with grinding Wheel 14.
As illustrated
in FIGURE 1, and detailed in FIGURES 2 and 3, as
well as in FIGURES 4 and 5 later described in detailing
the grinding operations, head 12 is mounted in adjustable
30 relation to both the table 28‘ and grinding wheel 14.
In all the ?gures of the drawing all like elements are
shown by the same numbers.
An angle plate 32, shown in every ?gure of the draw—
ing, is secured to movable table 28 as by a bolt 34 ex
Other objects and advantages of the present invention 35 tending through slot 36 in horizontal leg 38, fastened
by nut 49‘. (FIGURES 1, 4, and 5.) Two push pins
will be apparent by reading the following speci?cation
42, shown in FIGURES 2 and 3, are aligned with the
with reference to the accompanying drawing forming a
part thereof. It will be understood that modi?cation
may be made in the structural details described and illus
trated, without departing from the spirit of the invention
as de?ned in the appended claim.
Reference to the drawings in which like reference
numerals indicate like or similar parts:
FIGURE 1 is an elevational view, in perspective, of
a typical grinding machine with which the invention is
FIGURE 2 is an exploded view, in perspective, showing
table slot into which they ?t, and are the means for
rapidly regaining a previously established alignment. Set
screws 44 fasten push pins 42 as desired. Vertically ex
tending leg 46 of angle plate 32 is apertured as at 4-8 to
receive bolt 50, and the aperture is further enlarged to
receive a bushing, lug, or boss, as at 52 for more rigid
connecting of mating elements. A cylindrical scale 54
indexed around the peripheral face as shown at 56,
affords exact angular adjustment in the vertical, longi
tudinal plane of the grinding machine as diagrammed in
Element 60‘, a right-angle connector termed a “knee”
an alternate assembly of the elements of the invention. 50 in machine shop practice, is adapted to engage the ver
tically extending leg 46 of angle plate 32 as an intermedi
FIGURE 4 is an elevational view, in perspective, of
ate supporting means. Boss 62, extending from leg 64,
the elements shown in FIGURE 2 assembled in a grind
one assembly of the elements of the invention.
FIGURE 3 is an exploded view, in perspective, showing
?ts enlarged aperture 52 and is blindly secured by bolt
50. A point of origin 66 is stamped to cooperate with
FIGURE 5 is an elevational view, in perspective, of
56‘ aifording exact angular adjustment longitudinal
the elements shown in FIGURE 3, assembled to illus
ly of the grinding machine. Completing the structure
trate a variation of the grinding operation.
of this angular “knee,” connecting means or leg 68 is
The precision required in grinding operations presents
at right angles to leg 64, and is apertured as at 76
the speci?c problem of relative positions between the
receive bolt 72. Aperture 70' is further enlarged as
work piece and the grinding element. This is particu
at 74 to receive a bushing, lug or boss as above described
larly true when cutting-tools such as milling cutters which
for another connection, enabling easy, exact and ?rm
are used in milling steel are the work pieces to be
assembly. Also a cylindrical face ‘76 is marked in de
ground. One such grinding operation is that termed
to afford exact adjustment transverse the bed of
“gumming” by which is meant grinding a “chip space”
ing operation.
the grinding tool and at right angles to the longitudinal
described above.
shanked-end milling cutters, and angle milling cutters, 65 adjustment
FIGURES 2 and 3 operably position backing plate 80
side cutters and face cutters. The ?xture described here
in relationship with the connecting elements of the as
has particular advantage in this operation.
sembly. In this “exploded” illustration, the shape and
It has long been the practice to gum a chip space or
of backing plate 80 is made clearer, as
dress a milling cutter on a grinding wheel by holding
or a “chip clearance and face” in hardened. highspeed
is its relation with the other elements of the assembly.
the cutter or work piece in the hands of the grinding 70 Further, it is believed FIGURES 2 and 3 Will be more
operator. The Wheel is approached at the most con
venient exposed part of the shaped periphery and a series
readily understood.
IBacking plate 80 is the means for operably connecting
dove-tail components and adjusted into position before
head 12 in proper relation to the grinding wheel 14 for
tightening bolts 96. In thisinstance the workpiece is one
which requires a different type of grinding than that dis
cussed as work-piece 20, and must be positioned to ap
proach the grinding wheel in a different plane and at a
the grinding operation. In the upper portion of backing
plate 80, an aperture 82 enlarged at 84 to receive a
connecting means such as a bushing 86, permits easy
connection with “knee” 60 (FIGURE 2), or directly to
angle plate 32 (FIGURE 3). A set screw 88‘is set into
the outer edge of the bushing head, as shown, to lock
when assembled.
Bolts 50 or '72 engage bushing 86 de
diiferent angle. The index ring 104, indexing trigger 108
and locking set screw 102, all serve the same purpose,
as previously described for FIGURE 2.
FIGURES 4 and 5 show diagrammatically the advan
pending on which grinding assembly is required, ‘FIG 10 tages in the grinding operations for each of the two as
URE 2 or FIGURE 3. A stampmark 91) provides angu
semblies detailed above. By adjusting the work-piece be
lar setting relations with degree scales 56 or 76, again
low, and in angular relation (in two planes) to the pre
depending on the assembly selected.
A dove-tail slide 92, raised on one face of backing
plate 81}, is adapted to engage a similarly shaped groove
on the engaging face of head 12, this association to be
fully described later. A slotted aperture 94 receives two
bolts 96 'which pass into drilled and tapped holes in head
shaped edge of the grinding wheel shown in ‘FIGURES
4 and 5, grinding movement from the edge of the tool
(work-piece) to the center as indexed and controlled,
will produce a perfectly gummed cutting tool. The chip
space is completed in a single pass of the Wheel; it is of
12 and position backing plate 81) and the head in adjust
constant depth being moved adjacent the lower grinding
wheel tangent, and perfectly angled for slope both toward
able relation to each other. As will be fully understood
the tool center, and as an under-cut for chip clearance.
later, when the operation of the device is fully described,
the relative adjustability of the backing plate and the
head, is most important in performing the grinding oper
invention where a ground face of pre-deterrnined con
shank of work-piece 2t} and, by means of set-screw 102,
duces a simpli?ed grinding operation which eliminates all
can be locked in place. An index ring 104 is slide-?tted
over the shank 21 of workapiece 20 and is locked in a
selected position relative to the notches 112 in the ring
and the grinding operation to be accomplished by a set 40
screw 105, and rotatably positions the piece in the head
errors found in the present procedures of manual grinding.
Once established, the same surfaces can be reproduced
FIGURE 5 illustrates the adaptability of the disclosed
tour, yet constant un-marred surface is required. In the
ations of this ?xture.
illustration, a conical cutter is shown as the subject of
Referring again to FIGURES 2 and 3, head 12 is de 25 the grinding operation, and a pre-shaped grinding wheel
tailed and positioned to make both assembly and function
is used. Again the disclosed ?xture must be adjusted
clear. As explained above, the engaging face of head 12
to approach the cutting tangent of the wheel which gives
is fashioned to cooperate in adjustable relation with back
a ‘?nished face of selected contour without a surface
blemish in the chip space. This is accomplished as is evi
ing plate 80'. In the illustrated elements, dove-tail slide
92 of backing plate 80 is fashioned to a slidable ?t into
dent from the above detailed description.
dove-tailed slot 109 in head 12. Drilled and tapped holes,
‘From the above, it will be evident that the complete
not seen, are positioned to receive setting bolts 96 through
?xture as described in relation to FIGURE 2 especially,
provides the means for accomplishing the required oper
slot 94-.
ations on most cutters used in the metal shaping industry.
Also unseen, but indicated by the relation and align
ment of work-piece 20, head 12 is drilled to receive the 35 The results obtained by using the described ?xture pro
for grinding wheel operations. A trigger block 106 with
cooperating spring retained trigger 108 and engaging lug
110 ?ts into the notches 112 of index ring 104- and ro
regardless of interruption ‘or discontinuance of the grind
ing operation, once started.
This ?xture by using additionally supplied standard
equipment furnished with grinding machines, will also
exactly and as ef?ciently grind the chip spaces (cutting
faces), of side cutters, insert tooth cutters, shell mills,
tatably positions work-piece 20 for cutting by the grind
shell reamers, and a multiplicity of like metal cutting
ing wheel 14. Finally, head 12 is ?tted with a drilled
and tapped hole through the ‘base permitting a bolt ‘114
(FIGURE 2) to be rotated and enter into the head to
bear against the bottom of the work-piece, regulating the
depth to which the work-piece is seated, and also by fur
ther rotation to press harder on the bottom of the work
tools. By further adding draw-ring type collets it can be
piece to gradually break the suction which could interfere
with removal from head 12.
Before turning to a description ‘of the operations of two
separate assemblies serving diiferent grinding operations
and illustrated in FIGURES 4 and 5, it is necessary to
fully describe FIGURE 3. In this latter ?gure, an ex
ploded detail such as shown in FIGURE 2 is illustrated.
In fact all the elements except the knee 60 are required
to serve this grinding purpose. The omission of knee 60
permits movement of the work-piece into grinding rela
tion with the assembly shown in FIGURE 2. For exam
ple, conical cutters requiring a continuous surface and
chip clearance from apexto, base can readily be dressed
by use of this assembly (FIGURE 3) of the ?xture. On
the other hand, a cylindrical cutter such as shown by
adapted to grind special and complicated indexed punches,
such as triangular, hexagonal, octagonal, square and rec
tangular in shape, with the same case, ef?ciency and ex
actitude. All of these adaptabilities will be readily and
fully understood by those versed in the art. It will be
further understood that it is here intended to cover all
changes and modi?cations of the examples of the inven
tion chosen here for the purpose of illustration which do
not constitute departures from the spirit and scope of the
invention as disclosed in the claim appended hereto.
I claim:
In combination, a grinding device comprising a support
mounting a generally horizontal bed having a slotted lon
gitudinal guideway, slide means comprising a horizontal
base and an integral centrally a-pertured upstanding plate,
said base having aligned lugs which are received in the
guideway for maintaining the slide means in a ?xed recti
linear path during its movement along the guideway, a
slot in said ‘base extending normal to the upstanding plate,
a ?rst locking bolt means extending through said slot for
work-piece 20, requires the elements of the ?xture shown
releasably interconnecting the slide means to the bed to
and arranged as in FIGURE 2.
permit both longitudinal and transverse adjustments‘of the
slide means relative to the bed, a connector comprising a
‘FIGURE 3, considered together with FIGURE 5,
~ show-s the angle plate 32 as the initial mounting element 70 centrally apertured ?rst plate and an integral centrally
of the assembly, as described in FIGURE 2. ‘In this in
stance however, the knee 60 is omitted and backing plate
80 is connected directly to the vertical leg 46 of angle
plate 32 by bolt 50 engaging bushing 86. Head 12is
slidably mounted on backing plate v60 by engaging the 75
apertured second plate disposed normal to each other, a
second locking bolt means extending through the central
aperture of the upstanding plate of the slide means and
the central aperture of said ?rst plate of the connector,
said second locking bolt means releasably interconnecting
the slide means and connector and permitting rotative ad
References Cited in the ?le of this patent
justment of the connector, a tool holding unit including
an apertured backing plate and a tool socket, means inter
connecting the backing plate and socket and permitting
adjusted rectilinear movement of the socket, other means
carried by the backing plate for securing the socket to the
backing plate in adjusted position, a third locking bolt
means extending through the aperture in the backing plate
and the central aperture of the second plate of the connec
tor, said third locking bolt means releasably interconnect 10
ing the tool holding unit with the connector and permitting
rotary adjustment of said unit relative to the connector,
said socket having means permitting rotative adjustment
of a tool received therein from one operative position
relative to a grinding wheel to selected operative positions 15
and means for locking the tool in an adjusted position.
2,421,35 8
Van Norman ________ __
Goodhew et al ________ __
Dobyne _____________ __
Sneva _______________ __
Aug. 3,
Nov. 15,
Apr. 2,
May 27,
Elliott et al. _________ __ July 19,
2,7 87,868
Rocheleau ___________ __ Oct. 11,
Germany ____________ __ May 17,
Shifando ____________ __ Apr. 9,
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