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Патент USA US2405551

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Aug. 13, 1946.
B. s. T. BISHOP ET AL
-
2,405,551
GRINDING WHEEL TRUING APPARATUS
Filed June v8, _ 1944
I
2 Sheets-Sheet ,‘L
'Jrew
Aug~ 13,1946‘
B.- s. T. BISHOP‘ ET AL
2,405,551
GRINDING WHEEL TRUING APPARATUS
Filed June 8, 1944
2 Sheets-Sheet -2
Patented Aug. 13, 1946
2,405,551 ~
UNITED STATES PATENT OFFICE
2,405,551
GRINDING WHEEL TRUDVG APPARATUS
Benjamin S. '1‘. Bishop, Shrewsbury, and Frank A.
Bicknell, Worcester, Mass, assignors to Leland
Gifford Company, Worcester, Mass, a corpora
tion of Massachusetts
Application June 8, 1944, Serial No. 539,358
6 Claims. (01. 125—11)
2
This invention relates to improvements in
grinding wheel truing apparatus. More particu
mounted on a grinding machine.
larly it relates to apparatus which may be in the
form of an attachment for grinding machines and
which can have its diamonds or other truing ele
ments preliminarily accurately set in readiness
of micrometric adjustment of the member on
which the diamond-carrying arm is mounted, a
plate of predetermined thickness is used, it being
for a wheel truing operation at the will of the ma
laid ?rst against one gage surface and then
against the other gage surface and the diamonds
To facilitate
the setting of the diamonds without the necessity
chine operator.
being adjusted to bear against the plate surface
It is an object of our invention to provide a
wheel truing apparatus having separately mount 10 which, in one position, faces one diamond and, in
another position, faces another diamond.
ed truing diamonds, each separately movable into
It is, moreover, our object to generally improve
truing relation with a different face of the cut
the structure and operation of apparatus for tru
ting edge of the grinding Wheel, and each prelimi
ing grinding wheels.
narily set in its mounting means for correct pre
In the accompanying drawings:
cision traverse of a face of the cutting edge of
the Wheel when moved by the operator to e?ect a
truing of that face. We provide swinging dia
15
Figure l is a plan view of wheel truing appara—
tus embodying features of our invention, shown
mounted on a grinding machine forward of and
mond-carrying arms, each swingable on an axis
below the horizontal plane of the grinding wheel
angularly related to the wheel face which is to
be traversed by its diamond. Preferably the arms 20 axis;
Figure 2 is an end elevation of the same with a
are mounted on an adjustable member which can
portion in section on line 2—2 of Figure 1;
be secured on a suitable ?xed part of a grinding
Figure 3 is a view similar to Figure 1 but with
machine where the attachment, during periods of
the diamond-carrying arms swung into truing re
non-use, will not interfere with the regular and
' normal operations
of the grinding machine. 25 lation to the grinding wheel;
Figure 4 is a plan view of the truing appara
However, the diamond-carrying arms are con
tus mounted on the diamond setting ?xture; and
stantly in readiness to be moved to bring each dia
Figure 5 is an end elevation of‘ Figure 4 show
mond in succession into truing relation to the
ing one diamond carrying arm in’ position for set
grinding wheel when the wheel is in a predeter
ting its diamond with relation to the plate on the
mined position with respect to the work driving
spindle.
gage face.
I
Referring to the drawings, an improved wheel
Another object of our present invention is to
truing device is shown as an attachment which
provide means on the truing apparatus for mi
can be mounted on a grinding machine in readi
crometer adjustment of the arm-carrying mem
ber in directions toward and from the wheel for 35 mess to perform a wheel truing operation at the
will of the operator. In the embodiment herein
predetermining the amount to be removed from
each wheel face while preserving the preliminar
ily set angular relation between an arm, its dia
it which are threaded into nuts I6, engaged in
mond and the particular wheel face which is to be
dressed.
40 a T-slot 48 in the part I2 of the machine. Each
nut i6 has a shank I‘! which extends out of the
Still another object is to provide a diamond set
T-slot and seats in a recess 20 in the under
ting ?xture for preliminary precise setting of each
side of base it] for ensuring a precision align
diamond in its swinging arm. A base is provided
ment of the base it relative to the T-slot H3.
comparable to the base upon which the truing
apparatus is to be mounted on the grinding ma 45 The base, between the bolts l4, I4 is formed at
its under side with a wide groove 22 for receiv
chine, so that the apparatus may be mounted on
ing a slide member 24 which extends beyond the
this ?xture precisely as it will be mounted on the
base both forwardly as at 25 and rear-wardly as
machine. A gage block is mounted on the ?xture
at 28. At the forward projecting end of the slide
‘base and has a forward part formedwwith faces
angularly related as are the faces of the cutting 50 there is mounted a block 35! on whose front face
is the setting gage 32. The forward shank end
edge of the grinding wheel which is to be trued.
of a screw 5:38 extends loosely through the gage
Hence the diamond in each swinging arm may be
and ‘block with a graduated knob 35 on its ex
set with relation to the proper gage face of the
treme forward end for micrometer adjustment
?xture and will be accurately set with relation to
a wheel face when the apparatus subsequently is 55 of the slide '24 by bringing particular graduations
on the knob into register with a guide edge 38
2,405,551
3
4
below and forward of said gage, a pair of arms
formed at the cut-out 40 of a plate 42 secured
on the top face of block 39. rl‘he inner end of
screw 34 is threaded into the forward part of
pivotally mounted on said support and independ
ently swingable on angularly related axes, a wheel
truing element adjustably mounted on each said
base l6 which serves as a ?xed nut coacting with
arm, said arms being adapted to rest on said sup
the screw for moving the slide relative to the Cl port in generally horizontal positions below and base when the screw is rotated. A vertical
forward of the gage, and means for swinging one
threaded stud d6 rises from the slide and ex
said arm to bring its said truing element to posi
tends through a‘slot 48 in base £9 with a nut
tion for adjusting its setting relative to a said
50 on its upper end engaging the large diameter
gage surface while the other arm continues in
washer 52 for clamping the base and slide to
gether in relatively adjusted positions. When
its said generally horizontal position.
2. Grinding wheel truing apparatus comprising
nut 50 is loosened the stud can move in slot 48
to permit adjustments of the slide. A set screw
a ?xed gage having a tapered part with faces
angularly related precisely corresponding to the
54 is provided in block 39 for locking screw 34
angular relation of the bevelled edge faces of
against accidental rotation after a micrometer
setting of the slide.
a Wheel which is to be trued, a horizontal support
below and forward of said gage, a pair of arms
as in Fig. l, in crossed relation with arm 58
overlying arm 56 and having a shape for bridg
ing arm 56 while its free end rests fiat on the
surface ll of base it. Assuming a proper pre
liminary setting of the diamonds 68, and a proper
support in generally horizontal positions below
The rearwardly projecting part 28 of the slide
pivotally mounted on said support and independ
has mounted thereon the two swinging arms 55,
ently swingable on angularly related axes, a wheel
53, each carrying a diamond 68.
truing element adjustably mounted on each said
At times of non-use, the arms 5'6, 58 lie flat 20
arm, said arms being adapted to rest on said
and forward of the gage, means for swinging
one said arm toward said gage to bring its said
truing element into a position for adjustment
of its setting relative to said gage while the other
arm continues in its said generally horizontal
adjusted relation between the slide member 24
and wheel iii, the wheel may be trued by merely
position, and graduated means for adjusting said
causing the diamond-carrying arms 55 and 58 to
traverse the faces of the grinding wheel which
is being trued.
The preliminary setting of the diamonds in the
arms 55, 53 may be accomplished prior to mount
ing the truing apparatus on the grinding ma
support toward and from said gage to set the
30
chine. A special ?xture is provided comprising
a base ‘ill having a top surface comparable with
the machine surface on which the apparatus ulti
mately is to be mounted. The base 1i] has a
T~slot '12 out of which the special nuts Hi can
project and seat in the recesses 26 in the under
truing element relative to said gage and, subse
quently, to set the set truing element in any of
various selected positions backward from the posi
tion of its setting relative to said gage, thereby
to set the truing element for precision truing of
a grinding wheel operating on work of any par
ticular diameter.
3. In a grinding machine having a grinding
wheel and having a ?xed horizontal surface below
and forward of the wheel above which surface is
the work position of the machine, wheel truing
side of the base if! of the truing apparatus, pre 40 apparatus comprising a horizontal base adapted
cisely as has been described in connection with
to be mounted on said fixed horizontal surface
the mounting of the apparatus on a machine.
below and forward of the grinding wheel, a pair
The bolts M engage the nuts iii to clamp base
of arms pivotally mounted on said base and in
Hi on base ‘IE with the slide member 24 pro 45 dependently swingable on angularly related axes,
jecting fore and aft of base it as previously
a wheel truing element mounted on each arm,
said arms being adapted to rest idly on said base
described.
Base ‘56, however, projects rearwardly beyond
in generally horizontal positions when a grinding
the slide and has mounted on its rear portion
operation is being performed by said wheel on
the upstanding member ‘it on whose top is se 50 work in said work position, and means for swing
cured a gage plate 76 having its forward part
ing one said arm independently of the other arm
shaped to provide the angularly related faces
to bring its said truing, element into truing en
i8, 8% corresponding in position and angle to the
gagement with the grinding wheel when said work
faces
(it of the grinding wheel 44. Hence,
position is vacant.
'
4. In a grinding machine having a grinding
by setting the diamonds ?t in arms 56, 58 for 55
wheel and having a horizontal surface below and
proper traverse respectively of faces 18 and 88,
the diamonds will be properly set for truing wheel
forward of the wheel above which surface is the
4-3 when the apparatus is mounted on a grind
work position of the machine, wheel truing ap
ing machine. Preferably, instead of setting the
paratus comprising a horizontal base adapted to
diamonds for traversing the faces ‘58, 833 of plate
be mounted on said horizontal surface below and
‘53, a loose bar or plate 82 is provided which can
forward of the grinding wheel, a pair of arms
pivotally mounted on said base and independent
be laid against the faces ‘E8, 80 in succession
ly swingable on angularly related axes, a wheel
thereby to project the angle of face so that the
truing element mounted on each arm, said arms
diamonds may be set relative to the outer surface
being adapted to rest idly on said base forwardly
of bar 82 without adjusting slide 24.
rI‘he herein disclosed simple yet accurately
of the grinding wheel and below the said work
position when a grinding operation is being per
effective means for truing a grinding wheel
enables the truing elements, correctly and ac
formed by said wheel on work in said work posi
curately set, to be ever ready in a non-inter
tion, with one said arm crossing over the other,
means for swinging said crossing over arm to
iering position, for use when needed
ing a fixed gage having a tapered part with faces
bring its truing element into truing engagement
with the grinding wheel when said work position
is vacant, and means for subsequently swinging
angularly related precisely corresponding to the
said other arm to bring its truing element into
angular relation of the bevelled edge faces of a
wheel which is to be trued, a horizontal support
truing engagement with the grinding wheel.
We claim as our invention:
1. Grinding wheel truing apparatus compris
5
2,405,551
5. In a grinding machine having a grinding
wheel mounted for rotation about a horizontal
axis, wheel truing apparatus comprising a plu
rality of arms each pivotally mounted for swing
ing about an axis disposed in a horizontal plane
substantially below the horizontal plane of the
axis of said grinding wheel, said arms being
adapted to rest in idling positions in which both
arms extend approximately in the horizontal
6
ing an arm pivotally mounted on a horizontal
pivot for swinging movement between an idle
position in which the arm rests approximately
in the horizontal plane of its axis of swinging
forwardly of and below said grinding wheel, and
wheel truing positions in which the arm is ad
~jacent peripheral regions of the wheel, a wheel
truing element mounted on said arm outward
from its axis of swinging, means on said arm
plane of their axes, with one arm extending across H) for swinging it thereby to cause said Wheel truing
the other, and a truing element on each said arm,
element to traverse a said peripheral region of
each said arm being swingable about its pivot
from its said idling position to bring its said
truing element into truing engagement with the
the wheel, and graduated means for moving the
said arm bodily toward and from the grinding
wheel a predetermined amount thereby to set the
grinding wheel.
15 truing element selectively for truing the wheel
6. In a grinding machine having a grinding
working on any of various diameters of work.
wheel rotatably supported for rotation about a,
BENJAMIN S. T. BISHOP.
horizontal axis, wheel truing apparatus compris
FRANK A. BICKNELL.
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