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Патент USA US3029573

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April 17, 1962
6 Sheets-Sheet 1
Filed April 15. 1959
April 17, 1962
>M. M. BASS ET A1.
6 Sheets-Sheet 2
_ Filed April 15, 1959
M/LÁ'J' M @A55
April 17, 1962
6 Sheets-Sheet 3
Filed April 13. 1959
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April 17, 1962
M_ M, BAss ET AL
Filed April 15, 1959
6 Sheets-Sheet 4
April 17, 1962
Filed April 13, 1959
6 Sheets-Sheet 5
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Aprll 17, 1962
Filed April 13, 1959
6 Sheets-Sheet 6
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Unite States Pater
Patented Àpr‘. 17, 1962
manually moving the work back and _forth across the face
of the grinding wheel.
A further object of the invention has been to provide a
machine, as aforesaid, in which the workman can hold
Miles M. Bass, Kalamazoo, Ramsay M. Bell, Schooicraft,
and Lee C. Hammond and Philip J. Robischung, Kala
the work, especially a tool point, stationary with respect
mazoo, Mich., assignors to Hammond Machinery
to a supporting table, either with or without assistance
of a mechanical holder or guide, and the relative motion
of the work with respect to the axis of the grinding wheel ‘
. Builders, Inc., Kalamazoo, Mich., a corporation of
Filed Apr. 13, 1959, Ser. No. 805,818
7 Claims. (Cl. 51-55)
is provided by the machine.
A further object of the invention has been to provide
This invention relates to a grinder and particularly to
one in which the grinding wheel may be caused to oscil
late at a controllable frequency and amplitude. This is
a continuation-impart of our application Serial No. 574,
72S, tiled March 29, 1956, now Patent No. 2,922,258, 15
issued January 26, 1960.
In conventional tool grinding equipment, it is customary
to provide a rotatable grinding wheel adjacent a work
a machine, as aforesaid, having a device by which the
axis of the grinding wheel is caused to oscillate with re»
spect to the work-supporting table.
A further object of the invention has been to provide
a device, as aforesaid, including a guard extending around
a substantial portion of said grinding wheel adjacent to
its grinding face for preventing the tool, the operator’s
hands, or the like, from accidentally slipping past the pe
riphery of the wheel and being damaged or injured
supporting table. The table is normally movable for
adjustment relative to the axis of the grinding wheel, so 20 thereby.
A -further object of the invention has been to provide
that the plane defined by the working surface of the wheel
a device, as aforesaid, wherein said guard may be readily
and the plane deñned by the table top will intersect at
removed from its guarding position adjacent the periph
whatever angle is desired to facilitate grinding the work
in a desired manner. However, in all of these grinders,
ery of the wheel when such a movement is required to
who is utilizing the machine, such as for grinding a tool
hook-shaped, tools.
insofar as we are aware, it is necessary for the workman 25 enable the wheel to be used for grinding reversely bent,
A further object of the invention has been to provide a
device, as aforesaid, in which such removal can be carried
out quickly and easily and without actually removing the
from the machine, whereby to keep .said guard n
wheel are well known to the industry and may be sum~
available for restoring into guarding position equally
marized here by pointing out that such movement of the
point, to manually move the tool point across the working
face of the grinding wheel. The reasons for such move
ment of the tool point across the face of the grinding
tool tends both to speed the grinding operation and k'to
work out any irregularities which may exist in the face
of the grinding wheel, i.e., “dress” the wheel. This latter
tends to secure a more nearly hat and a more smoothly
ground surface than would be possible if no» such move
ment of the tool point were employed. Further, this
quickly and easily.
Other objects and purposes of the invention will be ap
parent to persons acquainted with equipment of this gen- .
eral type upon reading the following disclosure and in
specting the accompanying drawings.
In the drawings:
movement of the tool point etîects a desirable amount
FIGURE l is a side elevational view of the machine _to
However, where a workman is urging a tool toward an
FIGURE 2 is a sectional View taken on the line 'II-II
of FIGURE l.
which this invention relates, with the adjacent side sheets
of so-called “cross-grain” grinding and prevents the wheel
40 thereof broken away.
grit from channeling thework.
oscillating wheel by hand, it sometimes happens that the
tool will slip past the edge of the wheel. When this hap
FIGURE 3 is a sectional View taken on the line III-III
of FIGURE 1.
FIGURE 4 is a sectional View taken on the line IV~--IV
cent portion of the table and, by stopping the machine 45
pens, the too-l may jamb between the wheel and an adja
practically instantaneously, cause severe mechanical dam
age thereto. Also, in electrochemical grinding with a
diamond wheel, such entry of the tool between the edge
of FIGURE 3.
FIGURE 5 is a sectional view taken on the line V
of FIGURE l.
FIGURE 6 _is a sectional view taken on the line VI-VI
of the wheel and the table will cause a short circuit which
can cause severe damage to the wheel by knocking dia 50 of FIGURE 3.
FíGURE 7 is a view of a modification taken with the
monds out of the wheel face edge. Further, if the work
man is urging the tool against the wheel with an appre
guard mechanism removed from the machine and viewedv
ciable force, his hand may strike the wheel and be injured
from the front ofthe machine.
FIGURE 8 is a side view of the guard shown in FIG- )
A further problem arises when a wheel of this nature
URE 7.
is arranged to be used with a portion of a table extending
FIGURE 9 is a top view of the guard shown in FIG
past a peripheral edge ofthe wheel in order that reversely
bent, somewhat hook~shaped, tools can be ground. In
this situation, the tool extends past and closely adjacent
URE 7.
FIGURE l0 is an oblique view of a machine showing
the guard of FIGURE 7 in position thereon, one portion
the periphery of the wheel so that a guard would prevent 60 of said guard being in operative position and the other
the use of the wheel for grinding such a tool. Therefore,
portion being out of operative position.
it is necessary that the guard be arranged so that itcan
be removed from its position along the peripheral edge of
the wheel whenever necessary to enable the wheel to
grind a hook-shaped tool.
Accordingly, a principal object of the invention has
been the provision of a grinding machine effective for ob
taining the individual shaping of the work, such as a tool
For the purpose of convenience in description, the terms
“upper,” “lower,” “left,” “righ ,” and derivatives thereof,
65 will have reference to the machine and parts thereof as
appearing in FIGURE 2. n The terms “front” and “rear”
will have reference to the left and right sides, respectively,
of the machine as appearing in FIGURE l. The terms
point, which is customarily obtainable by hand guiding 70 “innen” “outer,” and derivatives thereof, will have refer
ence to the geometric center of said machine and, parts
of said work with respect to the grinding surface, while
eliminating the fatigue, inaccuracy and inconvenience of
respectively, through both of which the screw 37 is thread
In meeting the objects and purposes above set forth,
we have provided -a machine having an adjustable, but
relatively stationary, table with which a manually oper
able tool holder may be used, if desired, said machine
edly received. One portion, here the rear portion 41,
is rigidly secured to the platform 15 between the ways
35. The screw 37 is rotatably supported upon the front
end of the table base 36 rand heldv against axial movement
with respect thereto in a substantially conventional man
having a structure for supporting a rotatable grinding
ner. A hand wheel 45 is secured to the front end of
wheel adjacent to said table. The grinding wheel is
the screw 37 for effecting rotation thereof, hence move
mounted for oscillatory movement transversely of its
ment of the base 36 along the ways 35.
rotational axis. During such movement, the center of
The table base 36 (FIGURES 3 and 4) extends later
said wheel traces an arcuate path which is generally
parallel to the surface of the grinding table, that is, the
tangent at the midpoint of said path is parallel both to
the surface, and to an adjacent edge 50, of said table.
This result is obtained by securing the grinding wheel 11
(FIGURES l and 4) to a shaft 12, which is rotatably
mounted adjacent to the table 14 upon a shaft support
bracket 13.
The support bracket 13 is in turn pivotally
supported by the bearing assembly 20 upon the platform
ally of, and above, the ways 35 and supports the bottom
of a hood 46, which substantially surrounds the table 14
and the grinding Wheel 11. Left and right table support
members 47 and 48 (FIGURES l and 4) are mounted
upon, and extend upwardly from, the table base 36 ad
jacent to its lateral edges (FIGURE 3) within the hood
i 46.
The members 47 and 4S are preferably hollow and
have concave, arcuate upper surfaces 49 having a sub
stantially horizontal common axis 50 (FIGURE 4) lying
15 of the machine frame 10. The shaft 12 is continu
20 within the plane defined by the upper surface 51 of the
ously rotated by a belt 16 driven by the motor 17.
table 14. A pair of table brackets 52 and 53 (FIGURE
Oscillation of the bracket 13 about its pivotal support
5) are secured to, and depend from, the lower surface of
20 is, in the preferred embodiment here shown, effected
the table 14 near its lateral edges. Said brackets 52 and
by a lever 18 (FIGURES 2 and 5) pivotally supported
53 have arcuate, convex lower surfaces 54 (FIGURE 4),
by the pillow block 19 on the upper wall 34 of frame 10
and connected to the bracket 13 by the pitman 21. The 25 which are snugly, slidably and respectively receivable into
the upper, concave surfaces 49. Side plates 55 are
lower end of the lever 18 is caused to oscillate, or is
secured to, and extend downwardly beyond, the lateral
alternatively held against oscillation, by a roller 22, which
sides of the brackets 52 and 53. Said side plates 55 em
is mounted upon the shaft 26, rotatable at a controllable
the lateral sides of the support members 47 and
speed with the pulley 25. The shaft 26 may be moved
radially of the axis of the pulley 25 by a hand wheel 23 30 48 when they are engaged by the brackets 52 and 53,
respectively, in order to prevent dirt from entering be
working through a mechanism 24 for adjusting the
tween the brackets and their corresponding support mem
amount of eccentricity of the shaft 26 with respect to
bers. The brackets 52 and 53 are slidable with respect
said pulley. The amplitude of oscillation of said wheel
to the support members 47 and 48 for effecting tilting of
11 is, therefore, controlled by the eccentricity, if any,
the table 14 about the axis 50. The table 14 may in
of the roller 22 with respect to said pulley 25. Rotation
clude a plurality of removable and replaceable wear
of said pulley 25 is secured through the belt 27 driven
plates 77 (FIGURE 6) and a recess 78 (FIGURE 5) in
through a suitable speed reducer 28 from, and by, the
its rearward edge, into which the grinding wheel 11 is re
motor 29. The speed of such oscillation is adjusted
ceived. The portion of the table 14 on opposite lateral
through the speed reducer 28 in response to adjustment
40 sides of said recess 78 are provided with wear plates 79
of the hand wheel 31.
and 89, which are movable toward and away from each
The table is arranged in somewhat U-shaped form in
other to vary the lateral extent of the recess 78 for rea
front of and extending on both sides of the wheel with
sons appearing hereinafter,
the portions which extend past said wheel arranged for
movement toward and away therefrom in the plane of
B. Grinding Wheel and Wheel Support
oscillation of the wheel in order to adjust same appro
assembly 20, which pivotally supports the
priately to the amplitude of oscillations of said wheel.
support bracket 13 (FIGURES l and 4) includes a pivot
The guard structure is mounted on the housing irn
shaft 82, which is substantially parallel with the extended
mediately behind said wheel and supports a pair of
arcuate segments spaced. from but closely adjacent the 50 axis of the screw 37, and is secured at its opposite ends
in the blocks 83 and S4 (FIGURE l) mounted upon the
peripheral edge of the wheel. Said segments are of suf
end of the platform 15. The shaft 82 is pref
ficient length to extend around said wheel to a point below
substantially directly behind the centerline
said table. The guard is then rendered removable either
of the table base 36. The support bracket 13 (FIGURE
by rotating the entire mounting unit around the axis of
the wheel or by removing one fastening for a guard seg 55 4) includes a cylindrical housing 85 at its lower end,
which encircles the pivot shaft 82 and is rotatably
ment and thereby rotating it around another fastening
mounted upon said shaft by means of the bearings 86.
into a non-interfering position.
Said bracket 13 also includes a support plate 87, which
is secured to, and spaced from, the housing 85 by a pair of
Webs 88. The shaft housing 89, in which the grinder
A. Frame and Table
60 shaft 12 is rotatably supported by means of the bearings
As shown particularly in FIGURES l and 2, the base
91, is mounted upon the plate 87. The grinder shaft 12
frame 10 of the grinding machine to which this invention
is axially parallel with the pivot shaft 82 and extends
relates is upright, substantially rectangular, in this partic
both forwardly and rearwardly from within the shaft
ular embodiment, and fabricated from any sturdy, con
housing 89.
ventional material, such as steel plates. A platform or
A grinding wheel mount 92 (FIGURE 4) is rigidly
bed plate 15 is mounted upon the upper wall 34 of the
secured to the front extensions 93 of the shaft 12 by
frame 10 and extends forwardly of the front wall 123 of
means of a bolt 94 in a substantially conventional man
the machine frame 1€). The forward end of the platform
ner. The rearward face of the wheel mount 92 and the
15 is provided with ways 35 on its upper surface, which
forward, annular end wall 95 of the shaft housing 89
engage and slidably support the base 36 of the table 14 70 `are provided with a suitable sealing device for preventing
for slidable, adjustable movement rearwardly and for
the waste materials of the grinding operation from getting
wardly of the machine frame 10. Such movement is ob
into the bearings 91. The grinding wheel 11 is secured
tained by means of the threaded engagement between the
to the front surface of the wheel mount 92, as by means
screw 37 (FIGURES 3 and 4) and the double or split
of bolts 36 (FIGURE 4), so that the planar grinding
nut 38, which has front and rear portions 40 and 41, 75 face of said wheel 11 lies in a substantially vertical plane,
and said wheel can be disposed adjacent to, and parallel
with, the edge 78a (FIGURE 4) of the table 14 within
the recess 7S.
wise slot 114 in the support Ibar 115 near the lower end
thereof. The upper end of said bar 115 (FIGURES 1
and 2) is pivotally mounted upon the upper wall 34 of
the machine frame 10.
C. Wheel Guard and Table Extensions
E. Oscillatory Drive Mechanism
A sleeve 1G11 (FIGURE 4) is adjustably supported upon
The pitrnan 21 is pivotally supported at one end upon
the forward end of the shaft housing 89 for controlled
the front web 38 ‘between the support plate 87 and the
movement about the shaft 12 in both rotational direc
cylindrical housing 85. The other end of said pitman
tions. A detent mechanism 1111 tends to hold the sleeve
1110 in selected positions with respect -to the shaft housing 10 ‘2,1 is pivotally secured to the upper end of the lever
13, which lever is pivotally supported between itsupper
89. Said sleeve 1011 is Idisposed within the hood 46 and
and lower ends by a pivot shaft 116 land a pillow block
supports a forwardly extending, arcuate flange 1112, upon
19 mounted upon the top wall 34 adjacent to the bearing
which the »arcuate guard element 1113 is secured. In this
assembly 20. The lower end of the lever 1S is provided
particular embodiment, the tilting axis 5t) of the table
with a slot 118 which is elongated lengthwise of lsaid
14 is disposed somewhat below the axis of the grinding
lever 18. The roller Z2 (FIGURES 2 and 5) is rotatably
shaft 12. However, the opposite ends of the arcuate
disposed within the slot 118 and is engageable with the
guard 103 `are capable of extending simultaneously below
side walls of said slot. The shaft 26 is secured to the
said table upper sur-face 51 in one selected position of
adjustment mechanism 24 for effecting movement of the
said guard, effected by appropriate positioning of the
roller 22 into and out of a position of concentricity with
sleeve 101B upon the shaft housing 39. The guard 1113
is spaced slightly radially outwardly of the grinding
the pulley 25.
The pulley 25 is connected by the belt 27, in a su-b
conventional manner, to the output of the
is preferably substantially co-planar with the front, or
speed `reducer 28, which is controlled by the hand wheel
grinding, surface 104 of the wheel 11. Said sleeve 100
also has an annular llange 911 (FIGURES 4 and 6), pref- 25 31 mounted thereon, and which is connected to the
motor 29, also in a substantially conventional manner.
erably near its forward edge, which extends radially be
A pump 136 (FIGURE 2) may tbe provided for forc
yond the periphery of the grinding wheel 11. The
ing a coolant or lubricant through the tube l105 Iand re~
flange 90 prevents the wheel 11 from striking those por
turning said iluid to the pump from its point of collec
tions of the table 14 on opposite sides of the recess 78
tion in the hood 46 -by conventional means, not shown.
when said wheel 11 is oscillated and the guard 103 is
removed from, or >rte-positioned on, the housing 89. As
shown in FIGURES 3, 5 and 6, the end wear plates 79
wheel 11 (FIGURE 4) is secured
and Si), which are disposed on the table 14 radially out
in place with respect to the shaft or spindle 1‘2, the table
wardly from the grinding wheel 11, yare in their normal,
14 is then moved rearwardly until the rearward edge 78a
or extended, position when the arcuate guard 103' is 35 (FÍGURES 4 and 6) of said table 14 Within the recess
centered. However, when said guard 163 is moved, for
7S `and between the end wear plates 79 and 80 (FIGURE
purposes appearing hereinafter, to its broken line posi
5) is spaced »a relatively slight `distance from the front
tion 1035i, as shown in FIGURE 5, the end plate 79
face 104 of the grinding :wheel 11. Where the tool, such
adjacent to that end of the guard 103 which is raised
as that indicatedl in broken lines at 137 in FIGURE 4,
above the level of the table may be moved in adjacent to 40 is of the type which may be supported upon the wear
the peripheral edge of the grinding wheel 11, as indicated
plates ’77 in front of the grinding wheel 11, the horseshoe
at 79u, or as close `as the ñange 90 on the sleeve 1li()l will
shaped guard 103 (FIGURES 3 and 5), which encircles
wheel 1v1, and the front surface of `said arcuate guard ‘103
Means, including the tube 195, is supported by the
flange 1&2 for directing cooling and/ or grinding lluid at
the center of the wheel 11.
he support bracket 13 and the portion of the shaft 12
and the shaft housing 89 disposed outside of the hood 46
are substantially enclosed hy an enclosure 97 (FIGURE
the exposed portions of `the peripheryl of the grinding
wheel >11, will be :disposed so that its opposite ends are
below the surface of the table 14, as shown in FIGURE 5.
In such case, the end wear plates 79 and SG (FIGURES
3 and 6) will be moved laterally outwardly of the edges
of the other wear plates 77. However, if it becomes de
sirable to work on a hook-type tool of the type shown
4), which is mounted upon the frame lll and has an
in broken lines at 13S in FIGURE 6, then the guard 103
opening 98' in its front wall, through which said shaft
may be rotated in one direction or'the other around the
housing S9 extends. The opening 9S is laterally elon
axis of the shaft 12 into a position to expose the periphery
gated to permit oscillation of said housing S9 with respect
of the wheel 11, las indioated'in broken lines at 103e in
to the enclosure 97. The space between the housing S9
FIGURE 5. The end wear plate 79l adjacent to the ex
and the enclosure 97 is closed by an annular sheet 99 55 posed portion of said wheel is then moved into a position,
having a flanged, internal edge 99a, which snugly em-
braces the housing 89. Said ilanged edge 99a, hence the
sheet 99, is secured to the housing 89 by a resilient ring
81 and said sheet 99 slida‘oly and snugly engages the front
wall of the enclosure 97 'to provide a dust seal.
D. Wheel Drive Mechanism
The rear extension 106 of the shaft 12 supports a
pulley 107 (FIGURES l Iand 4)., which is connected to a
as shown in broken lines `at 79a in FIGURE 6, so that
v it can hold the tool 138, which must extend partially be
hind the plane deñned by the grinding face 104.
When the proper adjustment of the table has been
obtained, the motor 17 (FIGURE l) can then be ener
gized, thereby causing the shaft 12 land grinding wheel
11 to rotate. The motor 29 is _also energized, which
drives the speed reducer 28, which in turn rotates the
pulley 1118 by the belt '16, said pulley 16S being mounted 65 pulley 25 of the adjustment mechanism 24.
upon the shaft ofthe motor 17. The motor 17 is sup~
ported ‘below the platform 15, in this particular embodi
The pulley 25 acts through suitable means within the
housing 122 to drive the crank 26 and thereby eifect an y
oscillatory pivoting of the lever 18 about the pivotal axis
provided by the lever bearing 19. , Such reciprooation
motor is parallel with lthe shaft 12 (FIGURE 2). The
motor mount 169 is pivotally supported along one edge 70 will be transmitted by the pitman 21 (FIGURE 2) to the
support bracket 13 for effecting 1a corresponding pivotal
thereof, parallel with said motor axis, upon a pivot shaft
reciprocation of said support bracket about> the pivotal
111, which is supported upon the frame 10. An arm
axis thereof provided by »the Abearing yassembly 20. This
112 extends from the opposite edge of said motor mount
will cause the shaft 12 to oscillate through a relatively `>
169 `and supports a substantially horizontal pin 113 near
`its free end, which pin slidably extends through a length 75 small arc crosswise of the machine, the tangent of said
ment, upon a motor mount 169 so that the axis of said
arc at its midpoint being substantially parallel to the
pivot axis 50 of the table 14, `and thereby effect a similar
lateral oscillation of the grinding wheel 11. Where the
grinding wheel, as shown here, has a relatively narrow
grinding face 104, the oscillation of the grinding wheel
will be relatively small and, as `a general rule, will be
somewhat less than the radial width of the grinding face
on said wheel 11. Thus, the path traversed by the axis
of the shaft 12 during said oscillations, although arcuate,
will be relatively flat and substantially parallel to pivot
axis 5t) of the table 14. However, since the path of oscil
lation of said shaft 12 is arcuate, and since the radius
of this arc is substantially less than, here approximately
one-half of, the axial distance between the shaft 12 and
the shaft of the driving motor 17, some provision must
be made for keeping the belt 16 under uniform tension
during the operation. This is accomplished by pivotally
and forwardly extending portion 204 whose forward face
205 is parallel with, and substantially coplanar with, the
plane of the cutting surface of the wheel and is located
closely above said wheel, the position of said wheel with
respect to the guard being indicated by the broken line
W. Said housing 201 has a central portion 206 on which
is mounted, if desired, a center guard 2G5a for said wheel
by which the central portion of the wheel is filled when
a cup-type wheel is utilized. Such a center guard is fur
10 ther described in U.S. Patent No. 2,361,550.
Extending sidewardly in `both circumferential direc
tions frorn the central portion 206 (FIGURE 9) of the
guard structure and off-set slightly backwardly from a
condition of co-planarity with the forward or cutting face
of the wheel are a pair of guard supporting wings 207
and 208. Each of these wings is provided with at least
two threaded openings of which the openings on wing 207
supporting the motor mount 16'9‘ upon the pivot shaft
are shown at 299 and 211 whose purposes will be further
111 so that said motor partially hangs upon the belt 16.
indicated below.
Thus, as the shaft 12 moves upwardly and downwardly a 20
A pair of guard members 214 and 216, preferably of
relatively small distance during the arcuate movement
thereof, the motor 17 is free to move upwardly and down
non-electrically conductive material where the machine
is to be used for electrolytic grinding, comprise a pair of
wardly this same slight distance.
arcuate segments which are each a?xed, respectively, to
The flexible and resilient `annular sealing sheet 99 (FIG
said wings 207 and 203. Suitable openings are provided
URE 4) permits movement of the shaft housing 89 with 25 through each of said guard members in register with
respect to the enclosure 97 during the oscillation of said
the threaded openings above mentioned. Suitable thread
shaft housing 89 without impairing the seal provided
ed fastening means, as the screws 217, 218, 219 and 221
thereby. The opening 98 in the enclosure 97, through
are provided for cooperation with said threaded open
which the shaft housing 89 extends, is suliiciently large
ings for holding said guards 216 and 214 tightly against
to permit the desired oscillation of the shaft housing S9. 30 said wings. Said guards are each shaped so that they are
Adjustment of the oscillation distance or amplitude of
positioned closely adjacent the peripheral surface of said
the shaft 12 is effected by turning the hand wheel 23 as
Sociated with the adjustment mechanism 24. By appro
priate adjustment of the hand wheel 23‘, the roller 22 can
be caused to be completely concentric with the pulley 25,
whereby the grinding wheel 11 can be caused to rotate
without any reciprocation or oscillation whatsoever.
It will be recognized that the adjustment of the table
wheel and so that their respective front faces 222 and
223 are co-planar with the front face of said wheel. The
guards are of such length that they extend slightly below
the surface of the table, the same being indicated with
respect to guard structure shown in FIGURE 7 by the
broken line 224 and shown in FIGURE l0 at 14.
Where a tool having its point on the end thereof is to
14, the guard 103, the end wear plates 79 and S0, the
be ground by the apparatus herein described, the guard
adjustment mechanism 24 and the speed reducer 28 can 40 will be lowered into the position shown in FIGURE 7,
be effected while the machine is in operation.
and the tool applied against the face of the wheel in a
The necessary adjustments having thus been completed,
conventional manner, the guards 214 and 216 preventing
the ltool from slipping past the periphery of the wheel if
the tool, either as shown at 137 in FIGURE 4 or at 138
in FIGURE 6, is placed upon the table 14 and held
the workman has not properly allowed for reciprocation
of the wheel in his locating of the tool. If, however, a
there, either manually or by mechanical means, while the
grinding wheel 11 and the guard 103 reciprocatcs with
reversely cut, or hook-shaped, tool is to be ground then
the screw 217 or the screw 221, depending upon which
respect to the table 14, as indicated by the solid line and
broken line positions of these parts in FIGURE 6. The
side of the grinding wheel is to be used, will be removed
and the guard 214 or guard 216 associated therewith
grinding wheel 11 is protected from striking those edges
of the table 14 which define the lateral ends of the recess ' turned upwardly in a position as shown by guard 214 in
FIGURE 10. In this situation, the reciprocation of the
78 by the flange 9€) on the sleeve 100, which iiange eX
wheel will normally be stopped, or at least held to a
tends radially beyond the periphery of the wheel 11.
very small magnitude, and the tool will be supported on
The guard 103 provides additional protection, both for
and by an appropriate one of the wings 79 and 80 in
the wheel 11 and the hands of the workman, by closely
the manner shown in FIGURE 6. The grinding will
surrounding the portion of the wheel 11 exposed above
the table 14.
then proceed as desired.
When the grinding of the hook-shaped tools is com
pleted the guard 214 or 216, which ever one is raised,
Referring now to FIGURES 7 to 10, inclusive, there is
can then be readily returned to the normal position as
shown a modification which is somewhat more adaptable 60
shown in FIGURE 7 and the screw 217' or 221, which
to use with electrolytic types of grinding operations than
ever one was removed, restored into position for holding
is the form shown in FIGURES l to 6, inclusive, in that
its associated guard in position.
it eliminates the necessity for the housing 10G to rotate
Although particular, preferred embodiments of the in
on and with respect to the shaft housing 89. It has been
found that in electrolytic types of grinding, the salts used
in the electrolytic liquid often enter into the space be
tween the housing 100 and the housing 89, deposit therein
and render such movement extremely diñcult and often
vention have been disclosed hereinabove `for illustrative
purposes, it will be understood that variations or modi
fications thereof, which do not depart from the scope of
such disclosure, are fully contemplated unless specifically
stated to the contrary in the appended claims.
What is claimed is:
In the structure shown in FIGURES 7 to l0, inclusive, 70
l. In an oscillating type grinding machine including a
there is provided a housing 201 generally similar to the
grinding wheel, a shaft for supporting and rotating said
housing 160, previously described, but provided with
grinding wheel and a housing surrounding said shaft,
flanges 20.?. and 2553 which vare bolted together by which
means supporting said shaft for both rotary and oscil
said housing 201 is fastened rigidly to the shaft housing
latory movement; and a table having a generally L
89. Supported on and by the housing 201 is an upwardly 75 shaped portion arranged across the cutting face of said
grinding wheel and extending past at least one peripheral
and' into said center support means for removably hold
edge thereof, the improvement comprising: guard struc
ing said segments in their normal positions.
ture for said wheel mounted on said housing and having
a central portion extending therefrom to a position sub
stantially above the centrer of said wheel, said central
portion including a pair of laterally extending wings ex
tending in opposite circumferential directions with respect
to said wheel; a pair of arcuate segments mounted re
spectively on said wings and having `their forward faces
5. A grinding machine, comprising a face-type, rotata
ble grinding wheel; a work-supporting table; means sup
porting said grinding wheel for ‘back-and-forth movement
with respect to said work-supporting table; a housing se
cured in fixed position with respect to the axis of rotation
of the grinding wheel, said housing having a central por
tion positioned above said wheel; said housing having
arranged coplanar with the forward face of said wheel, 10 a pair of wings extending in opposite directions there
from and partially surrounding portions of the periphery
each Segment extending circumferentially at least part
of said grinding wheel; a pair of arcuate guard segments
way around said wheel to a point below the upper sur
pivotally mounted »at one end thereof on said wings for
face of said table, said segments being pivotally related
independent pivotal movement between a normal position
to said wings for pivotal movement with respect thereto
away from close proximity to said wheel; and detachable 15 where their radially inner edges are close to the periph
ery of said grinding wheel and a position where same
means for holding said segments rigidly with respect to
are substantially spaced from rthe periphery of said grind
said wings and against pivotal movement with respect
ing wheel, said segments being of suiiìcient length that
they extend below the upper surface of the work-sup
2. The device defined in claim 1 wherein said hous
ing has a cylindrical portion and said guard structure is 20 porting table when in their normal positions, said seg
ments having their forward faces substantially coplanar
provided with portions tdeñning a split sleeve for ar
with the forward face of said grinding wheel; and de
rangement around the cylindrical portion of said housing
tachable means extending through said segments adja
and including means rigidly fastening the portions of
cent said one end thereof and into said Wings forv hold
said sleeve together and removable with respect to said
ing said segments in their normal position, the remainder
prising in combination: means rigidly engageable with
said housing and having a central portion extending up
wardly and forwardly to a point above and substantially
6. A guard structure according to claim 5 wherein
said segments are of electrically nonconductive material.
7. A grinding machine including a face-type grinding
wheel, a shaft for supporting and rotating said grinding
wheel and a housing surrounding said shaft, means sup
porting said shaft for rotation and for back and forth
3. Guard structure for a face type grinding wheel
wherein said wheel is arranged for back-and-for-th move
ment with respect to a work-supporting table and the
means for supporting and driving said wheel includes a
housing which moves back and forth in synchronism 30
with the back-and-forth movement of said wheel, com
of said segments being unsupported so that same may 'be
pivoted to a position wherein they are located Va sub
stantial distance above said table.
centered over said wheel; at least one wing extending 35 movement rtransverse to the axis thereof; a table posi
tioned in front of the face of said grinding wheel and
sidewardly from said central portion and extending in a
having an extension opposed to and spaced from the
generally circumferential direction around »said wheel;
periphery of said grinding wheel; a support extending
an arcuate segment pivotally affixed adjacent one of its
over said grinding wheel; an arcuate segment mounted
ends to said `wing for pivotal movement, the other end
of said segment being unsupported and being free to 40 on said support and means pivotally mounting one end
of said segment on said support so that said segment can
move toward and away from the periphery of said wheel
'be moved between a iirst position wherein it extends
whereby said segment can be moved between a normal
around a portion of ‘the periphery of said grinding wheel
and into the space between said extension and the periph
concentric with the radially outer edge of said wheel and
positioned in close proximity thereto to a position where 45 ery of the grinding wheel and a position where said seg
ment is substantially spaced from the periphery of said
the other end of »said segment is spaced a substantial dis
grinding wheel, the other end of said segment being un
tance from said wheel, and means for removably hold
supported and free to move in response to pivoting there
ing said segment in said normal position.
of with respect'to said support; and releasable means for
4. A guard structure for a face-type grinding wheel
position wherein its radially inner edge is substantially
comprising center support means adjacent said grinding 50 normally holding said segment in said ñrst position.
wheel and stationarily mounted with respect to the axis
References Cited in the tile of this patent
of rotation thereof; a pair of arcuate segments movably
mounted on said center support means and extending in
opposite directions therefrom, said segments being sub
stantially coplanar with the face of said grinding wheel 55
and being independently movable between normal posi
Gorton _____________ _.. Ian. 10, 1905
Snude ________ __- ____ __ Dec. 28, 1926
Krueger ____________ __. Aug. 4, 1942
Krueger ____________ __ Oct. 31, 1944
Mader _'. ______________ __ Mar. 6, 1951
grinding wheel; and removable fastening means extending 60 2,713,234
through said segments close to the adjacent ends thereof
Hill ________________ .__ July 19, 1955
tions wherein their radially inner edges are close to the
periphery of said grinding wheel and positions where
same are substantially spaced from the periphery of said
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