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Патент USA US3088254

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May 7, 1963
3,088,249
L. a. POPE ETAL
GRINDING MACHINE
3 Sheets-Sheet 1
Filed Sept. 15,‘ 1961
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May 7, 1963
L. B. POPE ETAL
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3,088,249
GRINDING MACHINE
Filed Sept. 13, 1961
3 Sheets-Sheet 2
May 7, 1963
|_. B. POPE ETAL
3,088,249
GRINDING MACHINE
Filed Sept. 13, 1961
3 Sheets-Sheet 3
le
3&33249
V ‘Patented May 7, 1963
2
The grinder head 20 for external grinding comprises
3,088,249
GRINDING MAEHINE
Lyman B. Pope, Kingston, and John W. Sjostrom, Salem,
NJ-L, assignors to Pope Machinery Corporation, Haver
hiil, Mass, a corporation of Massachusetts
Filed Sept. 13, 1961, Ser. No. 137,783
6 Claims. (Cl. 51-105)
the frame 18 through the upper portion of which a sleeve
34 is slidable longitudinally but is held against rotation by
a suitable spline or key 36. Journalled in the sleeve 34
is a shaft 38 on one end of which is mounted a grinding
wheel 40, the other end of the shaft being connected
to an electric motor 42 or other means by which it can
be driven. The grinding tool 46 is arranged to be fed
axially by manual operation. For this purpose a hand
This invention relates to a grinding machine in which
adaptability to various uses is combined with a high de 10 lever 44 is operatively connected with the sleeve 34
whereby the shaft 38, the tool 45} and the motor 42 can be
gree of accuracy. The machine hereinafter described
advanced and retracted as a unit. The lever 44 is mount
and illustrated on the drawings is quickly and easily
ed on a vertical shaft 46 which is journalled in the frame
adaptable for internal or external grinding, and can, for
18. Keyed to the shaft 46 is a disk or drum 48 having
example, be used to grind standard centers or anti-friction
15 two circumferential grooves 50, S2 in its periphery. A
centers to accurate taper angles.
strong cable 54 which is virtually inextensible is passed
For a more complete understanding of the invention
around the circumference of the disk 48 and occupies
reference may be had to the following description thereof
half of the groove 50 and half of the groove 52 when
and to the drawings, of which
the tool unit is in its mid position of travel. The end
FIGURE 1 is a front elevation of a machine embody
portions of the cable 54 leave the disk tangentially in
ing the invention;
opposite directions as shown in FIGURE 7, the extremities
FIGURE 2 is a plan view of the same;
of the cable being secured to opposite ends of the key
FIGURE 3 is a partial view similar to FIGURE 2
36 which is mounted on the sleeve 34. Adjusting nuts
but showing a different position of operation;
56 are provided on the ends of the cable 54 to make the
25 cable taut so that there will be no backlash or play be
tween the operating lever 44 and the tool 40. A pair of
FIGURE 5 is a section, on a larger scale, taken on the
FIGURE 4 is a partial sectional view on the line 4-4
of FIGURE 1;
line 5-5 of FIGURE 2;
FIGURE 6 is a section, on a larger scale, taken on the
line 6-6 of FIGURE 1, and on the same scale on the
line 6-6 of FIGURE 7;
‘FIGURE 7 is a section on the line 7—-7 of FIGURE 6;
screws 58 may be set into the periphery of the disk at
the point where the cable 54 shifts from one groove to
the other to anchor the cable securely to the disk. Ac
cordion boots 60 are preferably provided between the
frame 18 and the motor 42 and tool 40 to protect the ex
posed portions of the sleeve 34 from dust and dirt.
‘FIGURE 8 is an elevational view of the mechanism
The work spindle head of the machine is mounted on
shown in FIGURE 7 with the cover removed; and
three elevated coplanar platforms 62 which are integral
FIGURE 9 is a fragmentary perspective view of the
spindle head, showing a driving connection for live centers. 35 with the bed 12. Slidable on the platforms 62 is a
cross-slide 64 which is a rectangular plate having a trans
The machine shown on the dram'ngs has a box-like
verse spline 66 on its under surface slidably ?ttted in a
base 10 the top of which is the bed 12. The bed 12 has
transverse channel in the middle platform 62 so that the
a raised platform 14 the surface 16 of which is made
accurately plane. The frame 18 of a grinder head 20 40 cross-slide is movable only at right angles to the longi
tudinal axis of the machine to carry the spindle back and
bears directly on the surface 16 and is clamped thereon
forth across the bed. Manually operable means are pro
by a single heavy bolt 22 which extends down from the
vided for rapid or gradual travel of the cross-slide 64.
bottom of the head 20 through an elongated aperture 24
For this purpose, a transverse bore 68 is provided in the
in the platform 14 and is threaded in a clamping member
in the form of a disk 26 which bears against the under 45 cross-slide and an internally threaded sleeve 70 is secured
in one end of the ‘bore 68. A feed screw 72 is in threaded
side of the bed 12. When the disk is loosened, the head
engagement with the sleeve 70 and is usually locked
20 is capable of universal adjustment on the surface 16,
against axial movement so that rotation of the screw ‘72
that is, it can be turned about a vertical axis to any
by the hand wheel 74 mounted thereon causes gradual
desired angle and can be given translational movement in
any direction on the surface 16 without the use of car 50 travel of the cross-slide 64. For quick travel, the feed
screw 72 is journalled in bearings at the end of a sleeve
riages or turrets. To this end, the dimensions of the
76 which is usually locked against axial movement but
bottom of the grinder head frame are substantially greater
which can quickly be released. To look the sleeve 76
than the width of the aperture 24, and the diameter of
a block 78 is forced down against it by a screw 80 turned
the bolt 22 is substantially less than the width of the
aperture, the disk 26 ‘being capable of spanning the aper 55 by a handle 82. When the pressure of the block 78 on
the sleeve is relieved by turning the screw 80, the sleeve
ture when the bolt is moved to any possible position
can be quickly advanced or retracted by manipulation of
through the aperture. Trwo side edges 28, 30 of the plat
a handle ‘84 on a shaft 86 which carries a pinion 88 mesh
form 14 are finished accurately in vertical planes which
ing
with gear teeth 90 cut into the side of the sleeve 76.
are parallel respectively with the longitudinal and trans
Resting on the cross-slide 64 is a plate 22 on which
verse axes of the machine. The side faces of the frame 60
is mounted the spindle frame 94. The plate 92 is con
18 are also accurately ?nished in vertical planes so that
nected to the cross-slide by a pivot 95 near the end
by using a machinist’s T-square, the grinder head 20 may
quickly and easily be set in close approximation to any
of the plate which is adjacent to the tool head.
The
direction to positions for operation on workpieces of
tudinally of the bed 12. For this purpose the plate 92
plate is capable of ?ne angular adjustment about the pivot
desired angular position and secured in such position by
tightening the bolt 22. The elongated slot 24 allows for 65 95. The frame 194 and parts carried thereby are ad
justable toward and from the grinder head, that is, longi
adjustive movement of the grinder head in any horizontal
is provided with a median tongue 96 and two T-slots 98
and 100. The spindle frame 94 is grooved on its bottom
moved and replaced by another grinder head, e.g., by a
grinding head for internal grinding, the latter requiring 70 as at 102, the groove ?tting slidably on the tongue 96.
To secure the ‘spindle head in adjusted position four
a much greater speed of rotation of the tool for satisfactory
bolts 104 are provided near the corners of the spindle
different sizes.
operation.
The grinder head can be quickly re
’ 3,088,249
3
4
frame 94, the heads of two of the bolts engaging in each
plane surface and universally adjustable thereon, meahs
extending through said aperture for clamping said unit
of the two T-slots.
Journalled in the frame 94 is a spindle 106 having a
collet .108 at one end which may be replaced if desired
by a chuck or other means for holding the work-piece.
in any position of adjustment, said grinder head unit
comprising a frame a horizontal sleeve slida'ble in said
frame, means preventing rotative movement of said sleeve
in said frame, a shaft journalled in said sleeve, a tool on
one end of said shaft, a motor connected to the other
To rotate a work-piece which is clamped in the 'collet,
power means are connected to the spindle. As shown, an
electric motor 110 is mounted on the spindle frame 94
and is connected to the spindle by a power belt ‘112 run
end of said shaft, means for feeding said sleeve, shaft,
tool and motor axially, said feeding means comprising
ning from a pulley 114 on the motor shaft 116 to a 10 a drum rotatably mounted edgewise to said frame, a cable
pulley 1118 on the spindle ‘106. If a live (anti-friction)
center is to be ground, the belt 112 is removed from the
pulleys 1114, 118, and a ‘belt 120 is mounted on the other
end of the motor shaft 116 and on the rotatable end por
tion of the live center as indicated in FIGURE 9.
15
extending around said drum with its ends secured to said
sleeve, and means for manually turning said drum, and
means on said bed for supporting and rotating a work
piece in an operative position relative to said grinder
head unit, said work-supporting means having means for
The adjustability of the grinder head 20 on the plane
?ne angular adjustment thereof about a vertical axis.
surface 16 makes the machine available for operation on
4. A grinding machine comprising a bed having thereon
a wide variety of sizes and shapes of work-pieces. Ad
a raised platform with an accurately plane surface and
vancing the tool to or along the work-piece -is readily
an elongated aperture therethrough, a movable grinderv
done by means of the handle 44, an adjustable stop mem 20 head unit having a plane bottom face bearing on said
ber 122 being provided to limit such advance if desired.
plane surface and universally adjustable thereon, means
As it is often important to grind an exact angle on
a center, a close approximation can be had by adjust
extending through’ said aperture for clamping said unit
in any position of adjustment, and means on said bed
ing the position’ of the grinder head on the platform
for supporting and rotating a work-piece in an operative
.14. Then trial pieces are ground and tested by sensitive 25 position relative to said grinder head unit, said work
means such as an optical comparator. Fine adjustments
of the angle are then made by small adjustive movements
of the plate 92 about is pivot 95. For this purpose
ears 130, 132 are ?xed to the sides of the cross-slide
64 near the end remote from the pivot 95. Bolts 134,
136v are threaded through ‘the respective ears, the ends
of these bolts abutting the sides of the plate 92 as in
dicated in FIGURE 2. These bolts can be manipulated
vsupporting means comprising a cross-slide keyed to said
bed, a plate on said cross-slide pivoted near the end
thereof adjacent to the grinder head unit, means for mak
ing ?ne angular adjustments of said plate about said
pivot, and a spindle headkeyed to said plate and longitu
dinally adjustable thereon.
,
5. A grinding machine as described in claim 4, in
cluding means for manually feeding said cross-slide trans
to make very ?ne adjustments of the angular position
versely of the machine by gradual movements and means
of the spindle head about the axis of the pivot ‘95. To 35 for releasing said gradual‘feeding means for rapid trans
secure the spindle head in its adjusted angular position,
verse movements of said cross-slide.
two bolts 150 and 151 with large heads 152 and 153
‘6. A grinding machine comprising a bed having thereon
respectively extend through the plate 92 and through over
a raised platform with an accurately plane horizontal
size holes in the cross-slide 64. The nuts on these bolts
surface and two accurately plane vertical edge surfaces
are loosened to release the plate 92 for ?ne angular adjust 40 which are at right angles to each other, said platform
ment about the pivot 95. Then the nuts on the bolts 150
having an elongated aperture therethrough, a movable
and 151 are tightened to hold the plate 92 and the spindle
grinder head unit including a frame with a plane side
frame 94 inaccurately adjusted angular position.
face in a vertical plane and a tool-supporting shaft car
We claim:
45 ried by said frame and rotatable about an axis parallel
1. A grinding machine comprising a bed having thereon
to said side face, said frame having a plane bottom
a raised platform with an accurately plane surface and
face of a length and width substantially greater than
an elongated aperture therethrough, a movable grinder
the width of said aperture bearing on said plane hori
head unit having a plane bottom face bearing on said
'zontal surface‘, and means on said bed for clamping
plane ‘surface and universally adjustable thereon, means 50. said. grinder head unitvin any position, of adjustment,
extending through said aperture for clamping said unit
said clamping means comprising a bolt extending down
in any position of adjustment, and means on said bed for
from
the bottom of the grinder head unit through said
supporting and rotating a work-piece in an operative po
aperture, the diameter of said bolt being substantially
sition relative to said grinder head unit, said work-sup
porting means having means for ?ne angular adjustment 55 less than the width of said aperture, and a clamping
member attached to said bolt spanning said aperture
thereof about a vertical axis.
2. A grinding machine as described in claim 1, said
grinder head unit comprising a frame, a horizontal shaft
extending through said frame, a tool at ‘one end of said
shaft, driving means at the other end of said shaft, and
manually operable means for feeding said shaft and tool
axially. '
3. A grinding machine comprising a bed having thereon
a raised platform with an accurately plane surface and
an elongated aperture therethrough, a movable grinder 65
head unit having a plane bottom face bearing on said
beneath the platform.
References Cited in the ?le of this patent
UNITED STATES PATENTS
928,164
1,178,036
1,467,023
Taylor _______________ __ July 13, 1909
Stretcher ______________ __ Apr. 4, 1916
Willson _______________ __ Sept. 4, 1923
1,877,546
Albee _______________ __' Sept. 13, 1932
2,645,069
Walkey ____,_x__l____g___r___ July 14, 1953
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