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Патент USA US2411591

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NOV. 26, 1946.
V
W_ E,'RANEY
2,411,591
DRILL GRINDER
Filed May 6, 1944
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ATTORNEYS
Novo 26, 1946.`
2,411,591
w. E_.hANEY
DRILL GRINDER
Filed May 6, -‘1944
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INVENTOR.
wlL'LlAM ERANEY
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ATTORNEYS
2,411,591
Patented Nov. 26, i946
I. UNITED , STATES
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Prcl‘lïl‘i'r;¥ OFFICE ' -
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DRILL GRINpEn
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vWilliam E. Rainey, shakervnei‘ghtaohio
Application May 6, 1944,1se'ria1 No. 534,450 ',
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tion of ¿the chuck itself is not likely to produce
any distorting, >cooking or damaging action upon
r"-_l‘l'ïie-present invention relates to a device for
¿grinding twist drills and a novel grinding method
¿inherent in the operation of such device. My
the drill.` >`lSuch chuck also includes an efficient,
invention is particularly »applicable toïthe grind
ing o_f rthe points of twist drills of relatively small
accurate and easily manipulated'means for rotat
ing it through apredetermined angle, (e. g. 180°
diameter, such as those in the» drill diameter range
of 15/64 in. to No. 80 gauge, i. e., from .2343 inch
succeeding drill point lips in the proper position
to .0135 inch diameter.
for> grinding.
in the case of a »two-flute twist drill) to locate
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~ Anotherfobject of my invention is to provide
Iny 'the drill grinding art, there are three re
quisites which mustbe'satisfied if an accurate
a method lfor controlling `both the amount of in
'and satisfactory cutting edge is to be imparted
feed` of the drill point with respect to the grind
ing wheel and the angle of lip clearance on the
to thedrill point; and these are, (l) the forma
'tionfof equal lip anglesiviz., the angle of the lip '
drill point. Briefly outlined, _I accomplish this
objective by rotating ïthe drill point through Va
or ycuttingl edge with respect to the drill axis),
A_predetermined arc ofv rotation, the angleor the
extent of-such arc being positively equal when
_¿(2) »coincidence of> the intersection of the drill
»point 'lips or cutting edges with the drill axis,
and (3) the accurate determination and equal
grinding'two or more of the drill lips. Thus, any
errors incident to feed movement control Vwhich
’ization of >the lip cuttingedge clearances or back
aredependent upon human manipulation of feed
off. ’inasmuch as the" in/feed of the drill with
respect to the grinding wheel or abrading surface 20 screws, camsÍand'indicator gauge readings are
entirely obviated by virtue of my invention.
is a basic factor in determining not only thev
t _ Additional objects and advantages of the inven
‘lip -angles but also the lip clearances, I provide
tion shall become apparent as the kfollowing de
~means for insuring an'equal and precise amount
scription proceeds.
-of’infeed’during the grinding of each lip of the
To the accomplishment of the foregoing and
25
drill.
M-y invention also »provides a novel and reliable
. »related-ends, said invention ythen’ comprises the
means for initially gripping the drill to be ground
'features hereinafter >fully described and particu
larly pointed'out in the claims, the following de
andaligning »its -lip or cutting edge with a fixed
scription and the annexed drawings setting forth
'reference line, whereby the grinding of all of
inv detail certain illustrative embodiments of the
vthe-lips on the drill point is >effected from the
invention, these being indicative, however, of but
Ysame point of reference; -_such aligning means
‘involving an optical gauging‘devicefrather than
_a fewfof the various ways in which the principle
of the invention may be employed.
In said annexed drawings:
~a mere physical abutment of the drill with a
gauge pin orethe like, vwhereby any likelihood of
error, due tothe relatively easy flexing of the drill
shank, particularly in the case of the smaller
sized drills, is eliminated.
Fig. l is a top plan view showing the drill l
grinding device embodying the principle of my
invention `in operative position with respect to a
_
>`The device embodying the principle of -my >in
vention insures a high degree'of accuracy in that
the major and essential parts of the device which
grinding wheel;
holds the drill and -impartsthe necessary motion
to it A¿for ‘the grinding operation are so mounted
Fig. 3 is an elevational view, partially in sec
tio’nfof thevdrill grinding device and taken from
as `to move about -predetermined centers or axes.
its outer'side, i. e. onthe side occupied by the
All of thesecenters or axes, in the'construc
tion-of-my drilljgrindingdevice, are given a def
drill grinding device alone;
line '4_-4 thereof;
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Fig. 5 is aside elevational view of the device
_(with the slide base omitted) and taken from
Another object "of my ¿invention is to provide
',an'improved form of drill holding chuck, whereby
theïside Vopposite to that of Fig. 3;
_
Fig. 6 is a substantially horizontal,- sectional
the drill is accurately held close to thepoint to
ing‘or‘distorti‘on, and in’which the gripping ac
_
Figuren' showing the spring 4|;
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bel ground, -thus‘minimizingerrors due to _bend
_
Y ¿Figure 4a is anenlarged'ïview _of a portion of
the 'initial starting point from such fixed refer
._
'_Fig`.~4 isa verticaLsectional view'taken upon
a plane normal -to Fig. 3 and substantially along
Amentioned >fixed _reference line, so that subse-v
quent operationsall vhave a; definite relation vto
line.
~
operator _andawayifrom the grinding wheel;
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inite and Viixed'location with respect to the‘above
ence
y
Fig. _2 is an enlarged-top plan view of the
view taken along line _E5-6 of Fig. 3; » _
55
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` Fig. 7 `isan enlargedr,»side elevationaleview show
¿411,591
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ing the detail of the drill point indexing and
gauging device;
at 33, is mounted in the trunnion bar '23 with its
axis perpendicular~ to the axis of the latter and
Fig. 8 is a top plan View of Fig. ’7;
Fig. 9 is a diagrammatic View illustrating the
infeed and axial rotational movements of the
laterally spaced or offset below it. This is in
dicated by the relationship of the axial center
drill with respect to the grinding wheel surface;
details of construction of the drill chuck 33 are
best shown in Fig. 6. An outer sleeve 34 rotatably
and
Fig. 10 is a diagrammatic view illustrating the
arcuate traverse of a given plane section of the
drill with respect to the grinding wheel and illus
trating the manner in which both the amount
of infeed and amount of lip clearance are deter
mined and controlled.
Now referring more particularly to Figs. 1-6
inclusive of the drawings, there are shown there
in a grinding wheel GW mounted upon the spin
dle of a drive motor I and the drill holding de
line YY and the center point 25 in Fig. 4. The
ñts within a bore in the cross bar 23. An inner
sleeve 35 ñts within the sleeve 34 Yand has an
outer flange 35 which has a tapered or conical
surface bearing seat as indicated at 31 on the
face of the cross bar 23. A drill holding bush
ing 38 has an inner cylindrical bore equal to the
outer diameter of the drill D which is to be
15 ground, and an outer tapered cylindrical surface
adapted to fit within a tapered bore in the end
of the sleeve 35.
A tapered or conical bearing surface 39 is also
vice or drill grinder of my invention as indi
located adjacent the outer flange of the outer
cated generally at 2. A base plate 3 is añîXed to
the top (indicated at 4) of the table or work 20 sleeve 34 and engages with a complementary bear
ing seat in the outside face of the trunnion bar
bench upon which both the motor I and drill
23. A chuck jaw housing 49 is mounted on the
grinder 2 are supported. A base block 5 has a
outer end of the inner sleeve 35. An elliptical
bottom channel iitting over the base plate 3,
leaf spring 4I is non-rotatably locked in a slot
with one or more set screws, such as indicated at
6, and an adjusting screw 1 for preliminarily 25 in the outer face of the flange on the sleeve 34
and mounted between the inner face of the hous
locating the drill grinder 2 with respect to the
ing 49 and the outer end of the outer sleeve 34,
grinding wheel GW. The upper face of the base
thus placing the sleeves 34 and 35 under a ten
block 5 contains a dovetail slideway in which
sion which draws them towards each other and
the slide base 8 is received. A cover plate 9
extends over the top of the slide base 8 for the 30 insures the proper seating and centering of
such sleeves upon their respective bearing sur
purpose of keeping out grit and grindings from
faces 39 and 31. In this manner the alignment
the slide surfaces. An adjustable locking screw
of the drill chuck 33 upon a fixed axis with re
I0 is mounted in the vertical plate II on the
spect to the trunnion bar 23 is accurately main
end of the base block 5 and bears against the
tained.l The spring 4I also serves as a friction>
left-hand or inner end of the slide base 8, thus
detent tending to lock the chuck jaw housing 40
providing an abutment determining the left-hand
in rotative movement with the sleeves 34 and 35.
movement of the slide base 8, i. e. the movement
An operating handle and lever 42 is attached to
of the latter in a direction toward the grinding
the outer sleeve 34 and adapted to -bear against
wheel GW.
the abutment pins 43 and 44 projecting from the
An operating lever I2 is pivotally mounted on
outer face of the trunnion bar 23.
the top of the slide base 8 as indicated at I3
A pair of chuck jaws 45 and 46, the jaw 46
and also connected through the link I4 to the
being bifurcated and adapted to receive the sin
pivot pin I5 which is in turn ñxedly attached to
gle end of the jaw 45 within such bifurcations,
the base block 5.
- are connected by means of transverse pins to the
The trunnion supporting frame or yoke I6 is
, scroll 41 on the inner face of the cylindrical,
rigidly secured, in common with the stanchion
knurled nob 48.
I1, to the vertical shaft I8 by means of the
A bar 59, of rectangular or square cross-sec
set screws I9 and 28. The lower end of the shaft
tion, is slidably mounted in the enclosed guide
I8 ñts within the slide base 8 and is rotatable
with respect thereto. The bottom ilange 2| on 50 housing 5I on the inner face of the trunnion
bar 23. An operating nob 52 is mounted on the
the rstanchion I1 is gripped by the clamping
outer end of the bar 50 for moving the latter into
screws and dogs as indicated at 2'2, for holding
and out of a position in alignment with the point
the stanchion I1 and the yoke I5 in the desired
of the drill D. A set screw 53 is carried in the
angular position with respect to the axis of the
projecting -lug 54 on the bar 50 and adapted to
shaft I8.
bear against the side of the housing 5I for de
The trunnion bar 23 extends between the ver
termining the extent of inward movement of the
tical arms of the supporting member or yoke I6
bar 5U. A disc 55, having a straight edge por
and is mounted therein upon the aligned center
tion 56, is adjustably mounted between the prongs
ing points 24 and 25. Compressible shims 26 and
of the bifurcated pin 51, by means of the adjust
21 are located between the ends of the bar
ing screw 58. A set screw 59 bears against the
23 and the inner faces of the arms of the yoke
lower cylindrical end of the pin 51 for holding
I6, for aiding in the correct centering of the
the latter at the desired position of rotative ad
bar 23 upon the ñxed center points 24 and 25.
justment in the end of the bar 5D.
The bar 23 is rotatable or rockable upon the
center points 24 and 25 by means of the oper 65 > A magnifying glass 60, carried in the frame
6I attached to the top side of the trunnion bar
ating lever 28 attached to the underside of the
>23, is focused upon the point of the drill D, as
bar 23. Contact screws 29 and 30 are thread
best illustrated in Figs. 4 and 6.
ably mounted in the lever 28 and are adapted
The operation of the above-described device is
to bear against the abutment bar 3I which is
as follows:
ñxed against the side of one of the arms of the
rThe lever I2 is pulled outwardly or toward the
yoke I6. A tension spring 32 normally urges
operator and away from the grinding wheel GW.
the bar 23 to the position shown in Fig. 4 and
The drill D is then inserted in the chuck 33 and
where the end of the screw 29 is in contact with
its lip aligned with the straight edge 56, and with
the abutment bar 3l.
The drill gripping chuck, indicated generally 75 lever 42 abutting pin 43, the drill is then clamped
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bythe chuck jaws. 45 and 46. InY the meantime,
thedri'll about the center'X-determinesy not' only
the s'tanchion l1 and the yoke |61 have been set at
_the desired» angle about theîaxis of the vertical
shaft i8., which corresponds to the angle of the
drillîpoiïnt to be ground. The bar 50 is then
mîoîved> to a retracted position, as represented by
the` angle of lip clearance, which vis represented
the >dotted lines iin Fig. 7. The lever f2 is then
pushed inwardlyuntil the slide base 8 contacts
with the end of the adjusting screw l0. The lever
by thestopping point of the drill in such traverse,
also determines» the amount of infe'ed-, In
110, the dotted line portions to> the >left vof
the grinding wheel arc GW represent the amount
ground olf or removed metal from the endA of
the drill». Variation in the extent of such arcor
ang-le of traverse of the drill about the center
28 is then depressed until the screw 3U contacts
X, and» accordingly variationin the lip clearance
with the abutment bar 3l, thus grinding one vlip
of the drill.A The lever l`2` is pulled outwardly
' angle and in the amount of infeed, are, of course,
again and the lever 42 rotated in a clockwise di
rection until it contacts with the stop pin 44, thus
controlled by adjustment of the screws 29v and 30.
It will thus be seen that the arc of traverse
for each lip drill grinding operation, starting and
slfîliftinïgr the» drill 186° (in the Case'of a tWo-iiute 15 stopping at exactly the same point in each case,
twist drill), about its axis, land presenting the
second lip for grinding.
I
The lever l2 is then pushed in to its full per
rnïissibl'e‘-Y extent and thefrlever 28 depressed, thus
grinding- theother lip of the drill point.
It will be noted that the vertical axis V of the
shaftî [3A intersects the point of the drill D when
the latter is in its properly aligned position with
the gauge 56, as illustrated in Fig. 4. "Hence, as
the stanchion l1 and the yoke l5 are pivotally
moved about the shaft i8 to determine the lip
angleA to be ground, the drill point necessarily
remains in one» and the same position.
This is
further illustrated in Fig. 9 where the drill point
P is the point of reference about which the axis
ofthe drill De pivots when the yoke I6 is set at
its predetermined angle, The line XX in Fig, 9
represents the axial center line of the trunnion
insures positively equal sized lips and equal> lip
clearance angles on the ground drill point.
Other modes of applying the principle of. the
invention may be employed, change being. made
as regards the details described, provided the fea
turesstated in any of the following claims or the
equivalent of such be employed.
I therefore particularly point out and distinct
ly claim as my invention:
1. A drill grinder comprising a rotatable mem
ber mounted between fixed center points, a drill
chuck carried by said rotatable member with the
axis of said chuck being. perpendicular to and
offset from the axis of said rotatable member,
means for rotating said rotatable member, a sup
porting member carrying said fixed center points
and pivotally mounted on an axis perpendicular
t'o> the;V axes of both said chuck and of said rotat
bar 233, and hence the axis about which the point
able member and intersecting the point of the
P’ and lip L of the drill are traversed during the
’ drill gripped' in said chuck when said rotatable
member is in normal position.
grinding operation. The dotted line L1 in Fig, 9
2f. A drill grinder comprising a rotatable mem
represents the depth of grinding cut or amount
ber mounted between fixed center points, a drill
of metal that is removed from the cutting edge
chuck carried by said rotatable member with. the
oi?ì the drill- lip during a single infeed movement.
This depth of cut must be precisely equal to the ad axis of' said chuck being perpendicular to and
depth >oftheV grinding cut taken off the lip L’
ciiset from the axis of said rotatable member,
said chuck including a removable bushing adja
when the drill is rotated about its axis De and
cent its forward end and adapted to hold the drill
then> fed into the grinding Wheel GW for grinding
close to the drill point, and chuck jaws adjacent
the other lip. As long as the infeed of the drill
during these-two grinding operations is positively 45 its rear end adapted to grip the drill shank.
equal', the two lips L1 and L'1 will likewise be equal
and the new point P1 of the drill will coincide
withk the drill axis De. The dotted line L’o in Fig.
9 illustrates the error which might otherwise be
3'. A drill grinder comprising a rotatable mem
ber' mounted between fixed center points, a drill
chuck rotatably mounted in said rotatable mem
' ber with the axis of said chuck being perpendicu
encountered, if such drill` infeed (represented by
lar to> and offset from the axis oí said rotatable
member, means for rotating said chuck about its
axis through. a predetermined angle, said chuck
trolled and determined.
including at removable bushing adjacent its for
Fig. 10 diagrammaticall-y illustrates the mannery
ward end adapted to hold the drill close to the
in which both the infeed of the drill and the angle
drill point and chuck jawsk adjacent its rear end
of lip clearance is determined in the method of
adapted to grip the drill shank, means for rotat
operation inherent in the above-described drill
ing. said rotatable member, and means for bodily
grinder of my invention, The point X in Fig. 10
moving said rotatable member in a plane sub
represents the axial center line of the fixed cen- ’
stantially parallel to the axes of said rotatable
ters 24 and 25 about which the trunnion bar 23
is rotated. The solid line shape A represents a 60 member and of said chuck when the latter is in
its normal position.
plane sectionV taken through the drill at a given
point parallel to its axis. In the normal position
4. A drill grinder comprising a rotatable mem
ber, means for rotating said rotatable member
ofr the drill shown, its axis YY passes through
through. a predetermined arc, a drill chuck
the center O of the grinding wheel GW (see Fig.
e).Y Now directing attention back to Fig. 10, as
mounted 'transversely of the axis of said rotatable
the dotted line arrow) was not so accurately con
thegiven, parallelV axial section A of the drill is
traversed about the center X, its lip- L travels
through the arc described by the radius R. The
dotted line positions B and C represent subse
member, said chuck including a pair of interñt
ting sleeves having flanges contacting with op
posite sides of' said rotatable member, and spring
means connected between said sleeves for urging
quent angular positions occupied by the drill in
its traverse about the center X. At the position
B.; the lip clearance angle will be approximately
8°,aas indicated at Lb, and at the position C the
the latter toward each other and for holding said
flanges in contact with said sides of said rotat-A
able member.
lilr` clearance angle will be 'approximately 16° as
5.`A drill grinder comprising a flat sided bar
rotatably mounted» between ñxed center points,
indicated at La, Thus, the ang-le of traverse> of 75 a. drill chucky mounted in said barl with~ itsl axis
2,411,591
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normal to that of said center points, said drill
chuck including a pair of telescopically fitting
justable abutment for limiting the movement of
sleeves, each of said sleeves having a terminal
said slide, an abutment on said trunnion adapted
to be contacted by said rotatable member for de
flange overlying one side of said bar, respectively,
conical bearing seats for said flanges on the sides
termining the limit of the rotative movement of
the latter, and spring means urging said rotat
of said bar, a chuck jaw housing attached to the
able member against said last-named abutment.
unflanged end of one of said sleeves, and a leaf
spring mounted between the flange of the other
of said sleeves and the radial face of said hous
ing, said spring urging said ñange and said hous
ing away from each other.
1l. A drill grinder comprising a trunnion mem
ber having ñxed center points, said trunnion
member being pivotally adjustable about an axis
l0 normal to that of said ñxed centers, a rotatable
member mounted between said ñxed centers, a
6. A drill grinder comprising a rotatable mem
drill chuck carried by said rotatable member with
ber mounted between supports at each end, a drill
chuck mounted in said member and having a
sleeve with a tapered iiange, a tapered bearing
seat in said rotatable member to receive the ta
pered flange, the axis of said chuck being per
pendicular to and offset from the axis line of said
rotatable member between its end supports, a le
the axis of said chuck being perpendicular to and
offset from the axis of said rotatable member, a
gauge bar movable parallel to the axis of said
rotatable member and into and out of a position
in alignment with the point of a drill gripped in
said chuck, a magnifying glass mounted on said
rotatable member and focused on such drill point,
a slide supporting said trunnion member and
movable in a plane substantially parallel to the
axes of said rotatable member and of said chuck
when the latter is in its normal position, an ad
ver for rotating said rotatable member through a
desired arc, and a gauge movable along said ro
tatable member into and out of a position align
ing with the point of a drill gripped in said chuck.
'7. A drill grinder comprising a trunnion mem
ber having fixed center points, said trunnion
member being pivotally adjustable about an axis
normal to that of said nxed centers, a rotatable
member mounted between said ñxed centers, a
drill chuck mounted in said rotatable member
and having a sleeve with a tapered flange, a ta
justable abutment for limiting the movement of
said slide, an abutment on said trunnion adapted
to be contacted by said rotatable member for de
termining the limit of the rotative movement of
the latter, and spring means urging said rotat
able member against said last-named abutment.
l2. A drill grinder comprising a trunnion mem
pered bearing seat in said rotatable member to
receive the tapered ñange, and a lever for rotat
ber having »fixed center points, said trunnion
member being pivotally adjustable about an axis
ing said rotatable member through a desired arc.
8. A drill grinder comprising a rotatable mem
ber mounted between ñxed center points, a drill
chuck carried by said rotatable member with the
normal to that of said fixed centers, a rotatable
member mounted between said ñxed centers, a
drill chuck carried by said rotatable member with
the axis of said chuck being perpendicular to and
offset from the axis of said rotatable member,
axis of said chuck being perpendicular to and
a gauge bar movable parallel to the axis of said
oiîset from the axis of said rotatable member, a
rotatable member and into and out of a position
gauge bar movable parallel to the axis of said ro
tatable member and into and out of a position 40 in alignment with the point of a drill gripped in
said chuck, a magnifying glass mounted on said
in alignment with the point of a drill gripped in
rotatable member and focused on such drill point,
said chuck, a magnifying glass mounted on said
the first-named pivotal axis of said trunnion
rotatable member and focused on such drill point,
member intersecting such drill point when the
means for rotating said rotatable member, and
means for bodily moving said rotatable member 45 latter is in contact with said gauge bar, a slide
supporting said trunnion member and movable
in a plane substantially parallel to the axes of
in a plane substantially parallel to the axes of
said rotatable member and of said chuck when
said rotatable member and of said chuck when
the latter is in its normal position.
the latter is in its normal position, an adjustable
9. A drill grinder comprising a rotatable mem
abutment for limiting the movement of said slide,
ber mounted between ñxed center points, a drill
an abutment on said trunnion adapted to be con
chuck carried by said rotatable member with the
tacted by said rotatable member for determining
axis of said chuck being perpendicular to and
the limit of the rotative movement of the latter,
offset from the axis of said rotatable member,
and spring means urging said rotatable member
a gauge bar movable parallel to the axis of said
against said last-named abutment.
rotatable member and into and out of a position
13. A drill grinder comprising a trunnion mem
in alignment with the point of a drill gripped in
ber having fixed center points, said trunnion
said chuck, a supporting member carrying said
member being pivotally adjustable about an axis
fixed center points and pivotally mounted on an
normal to that of said fixed center points, a ro
axis perpendicular to the axes of both said chuck
and of said rotatable member, the pivotal axis of 60 tatable member mounted between said fixed cen
ter points, a drill chuck rotatably mounted in
said supporting member intersecting the edge of
said rotatable member with the axis of said chuck
said gauge bar when said rotatable member is
being perpendicular to and offset with the axis
in normal position.
of said rotatable member, said chuck including
10. A drill grinder comprising a trunnion
a removable bushing adjacent its forward end
member having fixed center points, said trunnion
adapted to hold the drillV close to the drill point
member being pivotally adjustable about an
and chuck jaws adjacent its rear end adapted to
axis normal to that of said fixed centers, a rotat
grip the drill shank, means for rotating said
able member mounted between said ñxed centers,
chuck about its axis through‘a predetermined
a drill chuck carried by said rotatable member
with the axis of said chuck being perpendicular 70 angle, an abutment adapted to be contacted by
said rotatable member for determining the limit
to and offset from the axis of said rotatable mem
of its rotative movement, spring means urging
ber, a slide supporting said trunnion member and
said rotatable member against said abutment,
movable in a plane substantially parallel to the
a gauge bar movable parallel to the axis of said
axes of said rotatable member and of said chuck
when the latter is in its normal position, an ad 75 rotatable member and into and out of a position
2,411,591
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in alignment with the point of a drill gripped in
said chuck, a magnifying glass mounted on said
rotatable member and focused on said drill point,
a slide supporting said rotatable member and
movable in a plane substantially parallel to the
axes of said rotatable member and of said chuck
when the latter is in its normal position, and/an
10
ably mounted between supports at each end and
above its center line, a drill chuck rotatably
mounted in said member with the axis of said
chuck perpendicular to and offset below the axis
m of mounting of said rotatable member and hav
ing telescoping sleeves each with a terminal
iiange having a tapered surface, and a tapered
bearing seat on opposite sides of said rotatable
member to receive said flanges.
of said slide.
‘WILLIAM E. RANEY.
14. A drill grinder comprising a member rotat- 10
` adjustable abutment for limiting the movement
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