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Патент USA US3084496

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April 9, 1963
c. L! GARRISON
DRILL GRINDER
3,084,485
Filed March 6, 1961
55 £7
I - V
BY 3ATTORNEY;
1
United States Patent 0, "me
3,634,485
Patented Apr. 9, 1963
1
2
3,084,485
the drill and the grinding wheel at a third position indi~
cated in FIGURE 11;
FIGURE 15 is an enlarged view of an end of a drill
DRILL GRINDER
_
Clifford L. Garrison, Adrian, Mich, assignor to player
Instrument Company, Adrian, Mich, a corporation of
Michigan
Filed Mar. 6, 1961, Ser. No. 93,478
14 Claims. (Cl. 51—124)
ground or shaped by the apparatus of the invention;
FIGURE 16 is a plan view of a variable pitch control
cam forming a component of the construction;
FIGURE 17 is an elevational view of the cam illustrated
in FIGURE 16, and
FIGURE 18 is an elevational view of the cam rotated
This invention relates to apparatus for grinding and
shaping the cutting edges or lips and relief clearance of 10 through an angle of 90° with respect to the position of
drills and more especially to a drill grinder of a char
acter particularly adaptable for grinding and shaping the
points of medium and small size drills.
.
the cam illustrated in FIGURE 17
The arrangement of the invention illustrated in the
drawings is particularly adapted for grinding or pointing
drills of comparatively small sizes, but it is to be under
The present invention embraces an apparatus for grind
ing drills which requires a minimum of adjustments neces 15 stood that the principles of the invention and the method
of grinding variable relief upon drills may be employed or
sary to produce a drill point having desired cutting angles
adapted for grinding or imparting relief areas to other
and relief clearance.
types of rotatable cutting tools
Another object of the invention is the provision of a
Referring to the drawings in detail and initially to FIG
drill grinder having adjustable cam means of variable
URES 1 through 4, the grinding apparatus is inclusive of
pitch for regulating or controlling the amount of relief by
varying the locus or path of traverse of the end region of
a base or base frame 10 which is of comparatively thin
walled hollow construction as illustrated in FIGURE 3,
the drill with respect to the grinding wheel.
a driving motor 12, preferably of the electrically energiza
Another object of the invention is the provision of a
able type, being contained within the housing 10. The
drill grinder wherein the drill is pre-set in a chuck or
motor 12 is supported upon a member or platform 14
holder for establishing a predetermined relation of the
which is pivotally mounted on a pin or shaft 16 extending
drill to be sharpened with a variable pitch cam whereby
through openings in boss portions formed integrally with
varying degrees of relief clearance may be formed on
the wall of the housing Iii, ‘as shown in FIGURES l and 3.‘
the drill, the chuck being reversible whereby the cutting
lips and relief areas on a dual ?uted drill are of uniform
' The pivot 18 is adjacent one edge region of the motor
character.
30 support member 14 whereby the weight of the motor 12
and platform 14 exerts constant tension upon a driving
Further objects and advantages are within the scope of
belt 20 engaging a drive pulley 21 mounted upon the motor
this invention such as relate to the arrangement, operation
‘shaft 22, as shown in FIGURES l and 3. The pivotal
and function of the related elements of the structure, to
movement of the member 14 is restricted ‘by means of a
various details of construction and to combinations of
parts, elements per se and to economies of manufacture 35 screw 24 mounted in a threaded opening formed in the
wall of the housing 10. The housing 10 is provided with an
and numerous other features as will be apparent from a
upper horizontally arranged wall portion 26 to which is
consideration of the speci?cation and drawing of a form
secured a member 28 having convergently arranged sur
of the invention, which may be preferred, in which:
faces 30 extending lengthwise of the apparatus.
FIGURE 1 is a front elevational view of a grinding
40
Mounted upon the upper surface of the housing por
apparatus of the invention;
tion 26 is a carriage 32 movable lengthwise of the mem
FIGURE 2 is a top plan view of the apparatus, certain
parts being shown in section;
FIGURE 3 is a vertical sectional view taken substan
ber or tang 28, an adjustable gib 31 provided adjacent
one of the angular surfaces 30 being adjustable to com
tially on the line 3——-3 of FIGURE 2;
pensate for wear of the guiding surfaces. Secured to the
FIGURE 4 is a sectional view taken substantially on 45 forward portion of the carriage 32 is a ?tting 34 accom
the line 4—4 of FIGURE 2;
modating an externally threaded bushing 35 which sur
FIGURE 5 is a detail plan view illustrating a gage
rounds a tenon 36 formed on a lead screw 40‘ provided
means for pre-setting a drill in a chuck, the view being
with a collar 37. A handle 38 secured to the bushing 35
in the direction of line 5—5 of FIGURE 4;
provides means for readily moving the carriage 32 rela
FIGURE 6 is a detail sectional view taken substantially
tive to the lead screw 40 to withdraw the drill a slight
on the line 6-6 of FIGURE 4;
distance away from the grinding wheel to reverse the drill
FIGURE 7 is a plan view of a portion of the apparatus
during grinding operations, the handle 38 normally en
illustrating the relative position of the drill and grinding
gaging a stop or abutment pin 39.
wheel during grind operations;
The tang 28 is provided with a bore 42 accommodating
FIGURE 8 is a detail sectional view taken substantially 55 the lead screw 40, an internally threaded sleeve 44 being
on the line 8-8 of FIGURE 7;
pressed into the bore 42, the sleeve having threaded con
FIGURE 9 is a detail sectional view taken substantially
nection with the lead screw 40 whereby rotation of they
on the line 9-9 of FIGURE 7;
lead screw adjusts the carriage 32 lengthwise of the tang
FIGURE 10 is an isometric View illustrating the means
28. Fixed on the tenon 36 is a knurled manipulating
and method of retaining the drill and chuck in a holder 60 knob 45 for rotating the lead screw 40.
during ‘grinding operations;
FIGURE 11 is a schematic view illustrating three differ
ent positions of contact of the drill point with the grind
Mounted upon the carriage 32 is a second carriage or'
crosshead 52 formed with a tang portion 53‘ which is
mounted in a dovetail shaped recess 51 formed in the
ing wheel during a grinding operation;
carriage, 32 as shown in FIGURE 3, the crosshead or
FIGURE 12 is a schematic view illustrating the relation 65 second carriage 52 being movable along an axis at right
between the end of the drill and the grinding wheel and
angles or normal to the axis of adjustment of the car—
one of the positions indicated in FIGURE 11;
riage 32.
FIGURE 13 is a schematic view illustrating the relative
The tang portion 52 is secured to the second carriage
position between the drill and the grinding wheel at a
or crosshead 50 by screws 54, shown in FIGURE 4. The
70
second position indicated in FIGURE 11;
tang 53 is provided at its outer end with a ?tting 56 which
FIGURE 14 is a view illustrating the relation between
is bored to accommodate a tenon portion 58 of a lead
3,084,485
(D
“17)
screw 60 extending into and cooperating with a threaded
bore 62 formed in the carriage 32.
A knurled knob 64 is secured to the tenon 58 of the lead
screw 60 for rotating the lead screw to adjust the second
carriage or crosshead 52 in a direction transversely of the
carriage 32. A gib ‘66 is arranged at one side of the tang
53, as shown in FIGURE 3, and may be drawn into a
position to clamp the tang 53 in adjusted position by
means of a knurled headed bolt 67 shown in FIGURE 3.
With particular reference to FIGURE 2, a generally 10
cylindrically-shaped casing 70 is integrally formed with
the base 10 through a connecting portion 71 and rein
forcing ribs 72. The casing 7b is of hollow con?gura
8
trated in FIGURES 16 through 18. The cam member
129 is secured to the housing 126 by a screw 132 extend
ing through a boss portion on the housing 126 into a
threaded opening 133 in the cam block.
The right-hand end region of shaft 108, as viewed in
FIGURE 4, has a transverse bore accommodating a pin
or shaft 136 which extends exteriorly of shaft 168 and
journally supports a cam follower or roller 138. The pin
136 is secured to the shaft 108 by a setscrew 139.
The housing 126 is formed with an upwardly extending
portion 140 shaped with projections 142 and 144 at each
side of a space 145 as particularly shown in FIGURE 5.
Secured to the projections r142 by screws 143 is a gage
tion and the interior end regions thereof are bored to
block 147.
The gage block 147 is provided with an angular or
accommodate ball bearings 74 or other anti-friction 15
oblique gaging surface 1511 providing a means for pre
bearings in which is rotatably journaled an arbor or shaft
setting a drill in a chuck construction 152 adapted to be
“76. The arbor or shaft 76 is formed at its forward end
mounted in a supporting ?xture 154. The chuck and
with a tenon 78 upon which is secured a cup-shaped
grinding wheel 80 which is held in place by disc or washer
drill are subsequently transferred to a holder for carry
79 and a threaded nut 81 cooperating with a threaded 20 ing on grinding operations. Pressed into an opening
formed in the cylindrical member 1136 is a pin 156 which
portion formed on the tenon 7 8.
A grinding wheel guard 82 secured to the casing '76‘
projects into the space v145 provided between the projec
partially surrounds the grinding wheel as shown in F1!“
tions 142 and 144. The housing 126 is rotatable about
URES 1 and 2. The opposite end region of the shaft or
the cylindrical surface 124 of the cylindrical member
arbor 76 is provided with a tenon portion 84 to which is 25 1416 to the extent permitted by the projections 142 and
keyed a pulley 86 driven by the belt 20, a nut 87 threaded
144 on the portion 140 limiting the movement of the
upon a tenon portion of the shaft to secure the pulley
housing 126‘.
Means is provided for locking the cup-shaped housing
126 in various positions of adjustment. As shown in
and the driving belt 20 in the manner shown in FIGURES 30 F-EGURE 4, the portion 141} of housing 126 is provided
on the tenon 84. A cover plate 89 secured to the housing
10 by means of screws 90 encloses the pulleys 12 and 86
2 and 3.
The arrangement is inclusive of a means for dressing or
with a threaded opening accommodating a locking screw
158 provided with a knurled knob 16%} for manipulation
of the locking screw 158, the end of the screw engaging
wheel 80. As shown in FIGURES l and 2, the member
the cylindrical surface 124 of the housing 106. As the
or carriage 32 is formed with space projecting bosses 94 35 cam block 129‘ is secured to the cup-shaped member 126,
which are bored to accommodate a stub shaft 95.
the cam block position may be changed by adjusting the
Journaled for rotation upon the shaft 95 is a member 97
relative position of the housing 126v with respect to the
formed with an angularly projecting arm 98 terminating
shaft 108 and the cam follower or roller 13-8.
in a handle portion 99 for swinging the member 97 about
Formed on the left-hand end of shaft 1113, as viewed
the axis of the shaft 95. The handle portion 99 is pro
in FIGURE 4, is a tenon 162 on which is ?xedly secured
vided with a boss 160 in Which is secured a truing diamond
a member 164- integrally provided with an arcuately
102, which is adapted when the handle 99 is moved up—
shaped portion 166, shown in FIGURES 2 and 7, formed
wardly, as viewed in FIGURE 1, to move the truing
with an arcuately shaped recess 167. The arcuately
diamond 102 across the grinding face 92 of the wheel to
shaped recess .167 snugly, yet slidably, accommodates an
45 arcuately shaped member or sector 17%. The sector 17%
dress or true the wheel face.
The apparatus of the invention is constructed and ar
is maintained in the recess 167 by means of a cover plate
ranged whereby during the grinding operation of a drill,
172, shown in FIGURE 4, ‘secured to member 164: by
the drill is oscillated about an axis and is simultaneously
screws 173.
movable lengthwise of the axis of oscillation under the
Secured to the member 164 is a cylindrically shaped
truing the grinding face 92 of the cup-shaped grinding
in?uence of a cam to grind a cutting edge or lip and to 50 dust shield 174 which is slidable within a sleeve 176 se
provide relief clearance on the drill. The amount or
cured to the cylindrical housing 106, as shown in FIGURE
angularity of relief imparted to a drill is controlled
4. It should be noted that the flange portion of the dust
through a variable pitch cam and roller arrangement here—
shield 174 is spaced from the end of the cylindrical mem
inafter described.
ber 106 so as to facilitate longitudinal slidable move
The crosshead or secondary carriage 52 mounted on the 55 ment of the shaft 108 lengthwise of the member 106 under
carriage 32 is integrally formed with a generally cylin
the influence of the cam follower 138‘ cooperating with
drically shaped housing 106. Disposed within the cylin
the variable pitch earn surface 133v of the cam block 129‘.
drically shaped housing 1136 is a shaft N8 which is
The sector shaped portion .166 of member 1164 is pro
mounted in suitable ball bearings 11d and 112 contained
vided with a threaded opening receiving a setscrew or
respectively Within sleeves 114 and 116, the sleeves being 60 clamping screw 178 for vlocking the sector 170‘ in an
pressed into the cylindrical housing 1636. Mounted upon
arcuately adjusted position with respect to the member
the shaft 108 is an abutment or collar 118 which is held
upon the shaft by means of a setscrew 119. Surround
166. As shown in FIGURE 7, the sector 17%‘ is provided
with graduations 179‘ which cooperate with an edge 180'
ing the shaft 108 and engaging the end of sleeve 116 is
on member ‘166 as ‘an index or indicator. Through the
a second collar 120. Disposed between the collars 118 65 arcuate adjustment of the sector 1711 with respect to
and 120 is an expansive coil spring 122 which normally
member 166, the drill to be ground may be set at a de
biases or urges the shaft 193 in a left-hand direction, as
sired angle for the cutting edges or lips of the drill. The
viewed in ‘FIGURE 4.
sector 171} is provided with a drill chuck holder 134 here
The housing 106 is provided with a cylindrical surface
inafter
described in detail.
124 which supports a generally cup-shaped member 126 70
The drill D to be ground is mounted in a suitable chuck
having a closed end 127, as shown in FIGURE 4. Dis
152 which is received in the gaging ?xture 154 for initially
posed within the cup-shaped housing 126 is a cam mem
setting the drill in the chuck. The chuck construction
ber or block 129 having a central bore accommodating
152 for supporting the drill is particularly shown in
the end region of shaft 198. The cam member 129 is
FIGURES 4, 7, 8, 9 and 10. The chuck construction is
formed with a cam surface 131} of variable pitch as illus~
3,084,485
5
6
inclusive of two parallel jaws 186- and 187 respectively
provided with V-shaped opposed recesses 1188 to accom
plate 214 is withdrawn ‘from engagement with the chuck
jaws 186 and 187 and the spring 238 compressed. The
modate a drill D.
chuck construction 152 may then be inverted so that the
recesses 20th engage the pnojections 218 and the angular
edge 222 of the plate 214 engages the recesses 226 in the
rear ends of the chuck jaws 186 and 187 to secure the drill
As shown in ‘FIGURES 9 and 10, the opposed exterior
walls of the jaw member 186 are formed with recesses to
accommodate the leg portions 190 of a U-shaped mem
ber 192, the leg portions 196' being secured to the chuck
in :a position 180° removed from its initial position.
jaw r186 by rivets 194. The chuck jaw 187 is also formed
Through this arrangement both cutting lips or edges of the
with recesses to accommodate the leg portions 190, the
drill may be ground.
jaw 187 being slidable transversely of the chuck jaw 136 10
During a grinding operation, with the chuck carrying
so that the jaws may accommodate drills of various sizes.
a drill D illustrated in the position shown in FIGURE 7,
An opening in bight portion of member 192 accommo
the operator, through the medium of the handle 24%, os
dates a locking screw 1% provided with a knurled knob
cillates the holder 184 and the chuck 152, the sector 170/,
197. The screw 1% may be drawn up to clamp the drill
the arcuately shaped member 166 and the shaft 108 about
D between the chuck jaws 186 and 187.
15 the axis of the shaft designated by the line A—A. It will
With particular reference to FIGURE 10, it will be
be noted in FIGURES 7 ‘and 8 that the axis A—A is
seen that the forward extremities or regions of the chuck
slightly above the horizontal plane through the axis of the
jaws 136 and 187 are tapered or in generally convergent
grinding wheel and slightly forwardly of the wheel sur
relation and that the tapered portions are provided lWltil
face 92.
pairs of V-shaped grooves 200 and 29/1. As shown in 20
The operator oscillates the chuck and drill holder 184
FIGURE ‘4, the gaging ?xture 154 is provided with a
downwardly during a drill grinding or drill pointing oper
pair of plates 2% secured thereto by means of rivets 266.
ation and, under the in?uence of the cam follower 138 en
As shown in FIGURE 5, the plates 2% are provided
gaging the variable pitch cam surface 130', the drill is
with angular edge regions 29% ‘which selectively accom
drawn radially of the grinding wheel surface 92 to form
modate pairs of V-sh-aped grooves 2th} or 2tl1 formed in 25 the relief areas indicated at 251) on the end of the drill in
FIGURES 11 through 14 and to sharp-en the lips or cutting
the chuck jaws 186 and 187.
The assembly comprising the chuck jaws 186, 187, the
edges 252 of the drill.
U-shaped member 192 and the drill D to be ground is
An important feature of the construction is the provi
temporarily mounted between the plates 2% of the ?x
sion of the constant increment gage surface 150’ of the gage
ture 154 for positioning the drill in contact with the sur
face 1'51) of the gage block 147.
The holder for accommodating the chuck construction
and the drill carried thereby during grinding operations is
block 147 for setting the drill in a holder which is cor
related with the variable pitch or variable increment cam
surface 130 to provide for varying amounts of relief on
the end of a drill. The czun follower or roller 138 car
illustrated at 184 in FIGURES 7 and 10. Secured to the
ried by the shaft 108 is effective, through the medium of
sector 170 is a plate 219‘ which is disposed in a rectangu 35 the variable pitch surface 130 of the cam 129, to progres
larly shaped recess formed in a handle member 212, the
plate 211} being retained in the handle 212 by a cover
plate 214 secured to‘ the handle 212.
Mounted upon the portion of the plate 216' extending
sively move the drill D into and radially of the wheel
during a grinding operation.
Through the variable pitch cam surface 130, the relief
angle, in the various positions of adjustment with respect
forwardly of the handle 212 is a supporting means or 40 to the ‘drill, will be diiferent for different gage settings of
plate 216 for directly engaging and supporting the chuck
jaw construction 152. ‘The distal end region of the plate
the drill on the gage block 147. If the pitch of the cam
216 is provided with upwardly-extending convergently~
would ‘be ground on the drill irrespective of its gage set
ting position in the chuck as determined by its engage
ment with the gage surface 150 of the gage block 147.
The operation of the apparatus of the invention in
grinding the lips or cutting edges and clearance or relief
arranged blocks or abutments 218 formed with angularly
arranged surfaces 220. When the chuck construction 152
shown in ‘FIGURE 101 is mounted upon the plate 216 in
the manner shown in FIGURE 8, the angular surfaces
229 of projections 218 engage in the convergently ar
ranged recesses 2111 formed in the chuck jaws 186- and 187.
The forward edge region of the plate 214 is formed
with a convergently arranged surface 222. The rear end
of each chuck jaw 18d and 187 is provided with V-shaped
recesses 224 and 226', and, when the chuck 152 is in the
position shown in FIGURE 8, the edge 222 of the plate
214 engages in the recesses 224 of the chuck jaws 186 and
187.
The member 210 is formed with a longitudinal bore
230 in which is disposed a cylindrical member 232, the
latter being secured in the bore by a pin 234- disposed in
were a constant increment, the same amount of relief
areas on the end of a drill are as follows:
The ?rst step is to mount the drill D ‘between the chuck
jaws 186 and 187 of the chuck construction 152 and po
sition the chuck in the ?xture 154 for cooperation with
the gaging surface 150, the particular setting of which
determines the amount of relief clearance which is to be
ground upon the drill. The operator backs off the jaw
clamping screw 1% and inserts the drill D between the
jaws with the end of the drill projecting forwardly of the
chuck jaws. The screw 1% is then drawn up lightly until
the chuck jaws contact the drill.
The chuck 152 is then positioned in the gaging ?xture
aligned openings in the member 232, the handle portion 60 154 shown in FIGURES 1, 2 and 4 with the forward con
212 and the cover plate 214- of the handle.
The member 210 is provided with an abutment 236 and
an expansive coil spring 238 is disposed between the abut
verging surfaces of the chuck jaws contacting the conver
gently arranged surfaces 208 of the plates 264 of the ?x
ture 154. The gage block 147 is then adjusted by rotating
the cup-shaped housing 126 relative to the cylindrical
ment 236 and the cylindrical member 232 which, through
the medium of the connection with the handle 212 by the 65 housing 1%. For purposes of illustration it will be noted
in FIGURE 5 that graduations numbered 1, 2, 3 and 4
pin 234, exerts a forwardly acting bias or force upon the
handle 212 and cover plate 214 to hold the chuck con
struction 152 in engagement with the projections 218
through engagement of the forward edge 222 of the plate
214 in the recesses 224 in the chuck jaws. The portion
212 of the handle is provided with a laterally extending
hand grip 240 and the member 210 provided with a hand
grip or projection 242 as shown in FIGURES 7 ‘and 10‘.
By grasping the hand grip members 2401 and 242 and
moving grip member 240 toward grip member 242 the
are inscribed on the portion 141% of the housing 126 which
is rotatable relative to the pin ‘156.
By rotating the cup-shaped housing 126, the gage block
147 is correspondingly rotated, which changes the relative
position of the angularly arranged gaging surface 150 of
the block with respect to the drill D. If a minimum
amount of relief clearance is to be ground upon the drill,
the housing 126 is rotated to bring the index numeral 1
in alignment with the pin 156 which moves the region of
3,084,485
7
8
the gage surface 150 engaged by the drill further from the
drill retaining chuck 152. The maximum relief clearance
line of the drill will intersect the face of the grinding
wheel at a slight distance from the peripheral edge of
that may be formed upon a drill point is attained in setting
the wheel surface 92 as indicated in FIGURES 7 and 11.
the drill by moving the housing 126 until the graduation
identi?ed by numeral 4 is adjacent the pin 156.
The grinding of the ?rst lip of the drill and the adjacent
relief area is effected by oscillating the holder down
wardly and upwardly, which oscillation occurs about the
While the surface 151? on the gage block 147 is of a
constant increment, the cam surface 135 of the cam block
axis A—-A of the shaft 168.
At the start of the grinding operation, the center line
129, which is also concomitantly adjusted with respect to
of the drill is slightly inside the peripheral edge of the
the cam follower 138 when the housing 126 is rotated, is
of a variable pitch, and adjustment of the gage block 147 10 wheel. The angular extent of oscillatory movements of
the holder 134 to effect a complete grinding of a lip and
'brings a different range area of the variable cam surface
its adjacent relief area is about 60°. The relative posi
130 into position to control the cam follower 138‘ which
tion of the drill with respect to the grinding wheel at
is effective by moving the shaft 108 lengthwise to impart
the start of a grinding operation on a lip of the drill is
a particular angle or amount of relief clearance to the end
of a drill dependent upon the range area of the variable 15 indicated in FIGURE 12 and position (1) in FIGURE
11. As the handle 184 is moved downwardly the posi
pitch cam controlling the position of the drill with respect
tion of ‘the drill is shifted as indicated in FIGURE 13
to the grinding wheel ‘during grinding ‘operations.
and position (2) in FTGURE 11, and during such move
After the operator has determined the amount or angu
ment the shaft 1% is under the influence of the cam
lar relief clearance to be formed on the drill, and the gage
block 147 moved to the selected position, the locking screw 20 surface 135 and follower 133, the drill is retracted gen
erally radially away from the wheel, the drill being in the
158 is drawn up to lock the cup-shaped housing 1-26 to the
position shown in FIGURE 13.
cylindrical housing 165. The cam block 129 is thus
Upon further downward movement of the holder 184
locked against relative movement with the proper range of
at about an angle ‘of 60° from its initial position, the
the variable pitch cam surface 139 in a position to con
25 relative position of the drill is indicated in FIGURE 14
trol the follower 138.
and, in such position, the center line of the drill is outside
The operator then moves the drill D through the
of the peripheral edge of the grinding wheel as schemati
chuck jaws 136 and 137 until the point of the drill con
cally indicated at position (3) in FIGURE 11.
The angularity of the clearance or relief on the drill
URES 4 and 5. The drill is rotated in the chuck jaws
so that a cutting lip or edge 252 of the drill is positioned 30 is controlled by the selected range ‘of the variable pitch
cam surface 130, its position being determined by the
in a vertical plane as shown in FIGURE 5. This setting
position of the cam block at the time the drill is set or
may be performed by visual alignment of the edge in a
positioned in the chuck jaws by engagement of the drill
vertical plane. The locking screw 1% is then drawn
with the constant increment gage surface 15s on the gage
tightly to cause the drill to be gripped or clamped between
35 block 147.
the chuck jaws 186 and 187.
After the ?rst lip of the drill and its adjacent relief
The manipulating knob 45 is then rotated in a direction
tacts the gage surface 150 in the manner shown in FIG
to move the carriage 52 so that when the drill chuck 152.
area are ground upon the wheel, the operator moves the
handle construction 181% to substantially horizontal posi
is placed in the holder 184-, the end of the drill is spaced
tion and grasps the handle 38 shown in FIGURE 1
from the grinding surface 92 of the grinding wheel. The
chuck 152 and the drill D to be ground is then mounted 40 moving the same to a vertical position, which action
rotates the threaded bushing 36 so as to move the carriages
in the holder 184 shown in FIGURES '7, 8 and 10 with
32 and 52 slightly forwardly of the base 15 and grinding
the projections 218 on the plate 216 engaging the recesses
wheel 80 thereby Withdrawing the drill from engagement
251 in the chuck jaws, the hand grip 2433 drawn rear
with the grinding wheel surface Q2.
wardly towards the grip portion 242 to withdraw the
The operator then grasps the handle or grip portions
plate 214 so as to permit mounting the chuck in contact 45
240 and 242 retracting the grip 2411, the plate 214 and
with the upper surface of the plate 216.
member 212 to disengage the angular surface 222 of the
The grip portion 245 is then released and, under the
plate from the chuck jaws. The chuck 152 is then inverted
expansive pressure of the spring 238, the portion 212
and the recesses 20% engaged with the projections 218
and the cover plate 214 are moved toward the chuck jaws
bringing the angularly arranged edge surface 222 of plate 50 and the plate 214 released whereby the biasing force of
spring 238 moves the plate 214 so that the edge thereof
214 into engagement with the recesses 224 in the rear
engages the recesses 226 in the chuck jaws 186 and 187.
ends ‘of the chuck jaws 186 and 137. Under the in?uence
This inversion ‘of the chuck rotates the drill 180° and
of the spring pressure, the chuck 152 is securely held in
places the second lip thereof in a position to be ground.
grinding position in the holder as shown in FIGURES 7
The operator then moves the handle 38 downwardly
and 8. The sector 176 is adjusted to bring the proper 55
until it engages the stop member 39, this action bringing
graduation 179 in registration with the index line or
the second cutting edge or lip of the drill into contact
edge 1% of member 166 and the setscrew 1'78 drawn up,
with the grinding wheel face 92 and is ground to the same
the setting determining the angle of the cutting edges of
extent that the ?rst lip of the drill was ground as previ
the drill with respect to its longitudinal axis.
ously described. The operator then oscillates the handle
With the handle 38 carried by the threaded bushing
construction 1841 through its downward movement of
35 shown .in FIGURES 1 and 3, in engagement with its
approximately 60° and back to horizontal position to
stop or abutment pin or member 39, the knob 45 is rotated
to rotate the screw 40 and move the carriage 32 and
eifect a ‘grinding of the second relief area on the drill
the apparatus mounted by the carriage supporting the
tool holder 184 axially of the axis of the grinding wheel
until the lip of the drill engages the grinding surface 92
point.
It should be noted that this operation requires
no adjustment or readjustment of the grinding apparatus
other'than movement of the handle 63 to withdraw the
drill from engagement with the grinding wheel during
of the grinding wheel. The knob 45 is then moved an
reversal of the drill chuck 152.
additional amount to elfect a grinding of the lip of the
Through the provision of the drill setting gage oriented
drill to the extent that it is necesary or desirable to sharpen
or grind the lip.
70 with the variable pitch cam surface 130, the initial setting
of the drill with respect to the ?xture and gage surface
While this adjustment is being made, the operator holds
determines the effective amount of sweep movement for
the handle ‘construction 184 in a generally horizontal
a particulra amount of relief formed on the drill. When
position. The manipulating knob 64 is rotated to move
the drill is initially positioned at its greatest distance
the crosshead or supplemental carriage 52 in a direction
toward the axis of the grinding Wheel so that the center 75 from the holder or ?xture 1511, the least relief angle is
3,084,485
9 ,
formed on the drill, as it is moved through an arc of
greater radius during the grinding operation.
When increased angle of relief is desired, the drill is
positioned in the chuck with the setting gage so that the
drill is at a shorter distance from its gage ?xture and
holder so that, during a grinding operation, it is moved
combination, a support, a carriage adjustably mounted on
said support, an arbor supporting a grinding wheel, a
motorfor rotating the arbor and grinding wheel, a shaft
mounted by the carriage arranged for rotational and axial
movements relative to said carriage, a drill supporting
chuck, a holder for said chuck, a member movable with
through a more acute curve or are which imparts a
said shaft, means carried by said member for supporting
greater angularity of relief clearance to the drill.
An important feature of the arrangement resides in
said holder, said chuck and drill to be ground, cam and
cam follower means associated with said shaft for effect
the correlation of the movement of the cam block 129 10 ing lengthwise movement of said shaft concomitantly
with rotational movement thereof during a grinding oper
with the gage block '147 so that there is a predetermined
ation whereby to grind relief clearance on a drill, and
relationship at all times between the variable contour or
gage means connected with said cam means and arranged
pitch of the cam surface 134) and the gage block 147.
to position the drill in the chuck, said cam means and
This predetermined relationship assures the positioning
of the drill in the chuck so that the end of the drill will 15 gage means being adjustable relative to said cam follower
always be brought into proper cutting engagement with
means for controlling the angularity of relief clearance
the face 92 of the grinding wheel. Such arrangement
further assures that the center line of the drill during
to be ground on a drill.
4. Apparatus for grinding twist drills including, in com
bination, a support, a carriage adjusta‘bly mounted on
clearance which is to be formed on the drill, will initially 20 said support, a grinding wheel, a motor for rotating the
grinding wheel, an element supported on said carriage,
intersect the face of the drill the same distance from
a grinding operation, irrespective of the angle of relief
the peripheral edge of the wheel. For grinding different
size drills, chuck jaws 186 and 187 may be provided
a shaft journaled on said element, a cam member, a cam
It is apparent that, within the scope of the invention,
modi?cations and different arrangements may be made
other than as herein disclosed, and the present disclosure
adjustable relative to the axis of said shaft.
follower member, one of said members being movable
with the shaft, means carried by said element connected
adapted to accommodate various ranges of drill sizes.
When it is desired to dress the grinding face 92 of the 25 with said other member and adjustable relative to said
shaft for changing the initial relative position of one of
grinding wheel, the operator manipulates the knob 45
said members with respect to the other, a holder for
to retract the carriage 32 and the sector 170 a su?icient
mounting a drill to be ground, and an element formed
distance forwardly of the apparatus to enable the operator
with an arcuately shaped recess mounted by said shaft,
to grasp the handle 99 shown in FIGURE 1 to swing
the member 98 upwardly bringing the truing diamond 102 30 an arcuately shaped arm extending into said recess and
arranged to support said holder and movable about the
across the face of the grinding wheel to true the same.
axis of said shaft whereby the drill during contact with
The adjustment of the truing diamond holder is accom—
the grinding wheel is rotated about the axis of said shaft
plished by rotating the knob 45 to move the carriage 32
and movable lengthwise of said shaft under the in?uence
along an axis parallel with the axis of the grinding wheel
the required amount to engage the truing diamond with 35 of the cam and follower members for grinding relief
clearance on the drill, said arcuately shaped arm being
the wheel.
5. Apparatus for grinding twist drills including, in
combination, a base, a carriage adjustably supported on
is illustrative merely, the invention comprehending all 40 said base, a grinding wheel, a motor for rotating the
variations thereof.
grinding wheel, an element having a tubular portion sup
ported on said carriage, a shaft journaled in the tubular
I claim:
1. Apparatus for grinding twist drills including, in co-m—
portion of said element, a cam member, a cam follower
bination, a support, a carriage adjustably mounted on
member, one of said members being movable with the
said support, an arbor supporting a grinding wheel, a 45 shaft, resilient means biasing the cam member and cam
motor for rotating the arbor and grinding wheel, a shaft
follower member in engaging relation, means carried by
mounted by the carriage arranged for rotational and axial
said element connected with said other member and ad
movements relative to said carriage, a drill mounting
justable relative to said shaft for changing the initial
relative position of one of said members Iwith respect to
chuck, a holder for said chuck, a member movable with
said shaft formed with any arcuately shaped recess, an 50 the other, a holder for mounting a drill to be ground,
arcuately shaped arm extending into said recess for sup
an arcuately shaped arm mounted by said shaft arranged
porting said holder and chuck, and cam and cam follower
to support said holder and movable about the axis of
means associated with said shaft for effecting lengthwise
said shaft whereby the drill is rotated about the axis of
movement of said shaft concomitantly with rotational
said shaft and movable lengthwise of said shaft under
movement of said shaft and arm during a grinding opera 55 the in?uence of the cam and follower members during
tion whereby to grind relief clearance on the drill.
a drill grinding operation, said arcuately shaped arm
2. Apparatus for grinding twist drills including, in
, being adjustable relative to the axis of said shaft.
combination, a support, a carriage adjustably mounted
6. Apparatus for‘ grinding twist drills including, in
on said support, an arbor supporting a grinding wheel,
> combination, a ‘base, a carriage adjustably supported on
a motor for rotating the arbor and grinding ‘wheel, a 60 said base, a grinding wheel, a motor for rotating the
shaft mounted by the carriage arranged for rotational
grinding wheel, an element supported on said carriage,
and axial movements relative to said carriage, a drill
a shaft journaled on said element, a cam member pro
mounting chuck, a holder for said chuck, a member mov
vided with a variable pitch cam surface, a cam follower
able with said shaft formed with an arcuately shaped
member, one of said members being movable with the
recess, an arcuately shaped arm adjustably mounted in
' shaft, means carried by said element connected with said
said arcuately shaped recess in said member and sup;
other member and adjustable relative to said shaft for
porting said holder and chuck, cam and cam follower
changing the initial relative position of one of said mem
means associated with said shaft for effecting lengthwise
bers'with respect to the other, a holder for mounting a
movement of said shaft concomitantly with rotational
vdrill to be ground, and an arcuately shaped arm mounted
movement thereof during a grinding operation whereby 70
by said shaft arranged to support said holder and mova
to grind relief clearance on a drill, and means ‘for modify
tale about the axis of said shaft whereby the drill is ro
ing the region of engagement of the cam follower means
tated about the axis of said shaft and movable lengthwise
with the cam means to vary the character of the relief
of said shaft under the in?uence of the cam and follower
clearance ground on a drill.
3. Apparatus for grinding twist drills including, in 75 members during a grinding operation, said arcuately
ll
12
shaped arm being adjustable relative to the axis of said
shaft.
7. Apparatus for grinding twist drills including, in com
surface with the cam follower for controlling the axial
movement of said shaft to effect the grinding of vary
ing angles of relief clearance on a drill.
bination, a support, a carriage adjustably mounted on
said support, an arbor supporting a grinding Wheel, a
motor for rotating the arbor and grinding wheel, a shaft
11. Apparatus for grinding twist drills including, in
combination, a base housing, a grinding wheel journally
mounted by the housing, a motor for rotating the grind
ing wheel, a ?rst carriage supported on said housing and
adjustable along an axis parallel with the axis of rota
tion of the grinding wheel, a second carriage mounted
on said ?rst carriage and adjustable along an axis sub
stantially normal to the axis of the grinding wheel, a
mounted by the carriage arranged for rotational and axial
movements relative to said carriage, a drill mounting
chuck, a holder for said chuck, a member movable with
said shaft, means carried by said member for supporting
said holder and chuck during a grinding operation, a ?x~
ture mounted by the carriage adapted to receive the
shaft mounted for oscillatory ‘and axial movement on
chuck and a drill mounted therein, gage means for pre
said second carriage, a member arranged for adjustment
cam surface movable with said gage means, and a cam
cam surface, an arcuately shaped arm, means connected
about the axis of the shaft, means having ‘a variable pitch
determining the position of the drill in the chuck, means
supporting said gage means and being adjustable relative 15 cam surface movable with said member, a cam follower
carried by said shaft cooperating with the variable pitch
to said shaft, cam means provided with a variable pitch
with the shaft supporting said arm, said arm being ad~
follower mounted by said shaft and cooperating with the
justable in an are relative to said shaft, a drill mounting
cam surface for effecting lengthwise movement of said
shaft during rotational movement thereof for controlling 20 holder removably supported on said arm and arranged
to move the drill relative to‘ the grinding wheel during
the position of the drill relative to the grinding wheel
a drill grinding operation, the lengthwise movement of
during a grinding operation.
said shaft being controlled by said cam surface for deter
8. Apparatus for grinding twist drills including, in
mining the character of relief clearance ground on a
combination, a support, a carriage adjustably mounted
on said support, an arbor supporting a grinding wheel, a 25 drill.
12. Apparatus for grinding twist drills including, in
motor for rotating the arbor and grinding wheel, a shaft
combination, a base housing, a grinding wheel journally
mounted by the carriage arranged for rotational and axial
mounted by the housing, a motor for rotating the grind
movements relative to said carriage, a drill mounting
ing wheel, a ?rst carriage supported on said housing and
chuck, a holder for said chuck, a member movable with
said shaft, means carried by said member for supporting 30 adjustable along an axis parallel with the axis of rotation
said holder and chuck during a grinding operation, a ?x
ture mounted by the carriage adapted to receive the chuck
and a drill mounted therein, a gage block having a gaging
surface, means supporting said gage block and being
adjustable relative to said shaft, cam means provided
with a variable pitch cam surface movable with said
~ gage block, a cam follower mounted by said shaft and co
of the grinding wheel, a second carriage mounted on said
?rst carriage and adjustable along an axis substantially
normal to the axis of the grinding wheel, a shaft mounted
for oscillatory and axial movement on said second car
riage, a member arranged for adjustment about the axis
of the shaft, a gage block having a constant increment
gaging surface mounted on said member, means having
a variable pitch cam surface movable with said member
operating with the cam surface for effecting lengthwise
movement of said shaft during rotational movement there 4-0 and gage block, a gaging ?xture mounted on said second
carriage arranged to support a drill mounting chuck to
of for controlling the position of the drill relative to the
- grinding wheel during a grinding operation, and means
maintaining said cam follower in engaging relation with
the cam surface of the cam means.
9. Apparatus for grinding twist drills including, in
combination, a support, a carriage adjustably mounted
on the support, a rotatable grinding ‘wheel, a motor for
rotating the grinding wheel, a ?rst member mounted by
predetermine the position of the drill in the chuck by
the constant increment gaging surface, a cam follower
carried by said shaft cooperating with the variable pitch
cam surface, a drill chuck holder, means connected with
the shaft supporting the drill chuck holder arranged to
move the drill relative to the grinding wheel during a
drill grinding operation, the lengthwise movement of
said shaft being controlled by said cam surface for deter
mining the angle of relief clearance ground on a drill.
the carriage for rotational and axial movements, a holder
for mounting a drill to be ground, means connected With 50
13. Apparatus for grinding twist drills including, in
the ?rst member formed with an arcuately shaped recess,
combination, a base housing, a grinding Wheel journaled
‘ an arcuately shaped arm adjustably mounted in said recess
on the housing, a motor for rotating the grinding wheel,
a ?rst carriage supported on said housing and adjustable
along an axis parallel with the axis of rotation of the
grinding wheel, a second carriage mounted on said ?rst
carriage and adjustable along an axis substantially normal
to the axis of the grindnig wheel, ‘a shaft mounted for
surface connected with the other of said members, and
oscillatory and axial movement onsaid second carriage,
means for adjusting the initial relation of the cam surface
a member arranged for adjustment about the axis of the
with the cam follower for controlling the axial movement 60 shaft, a gage block having a constant increment gaging
of said i?rst member to effect the grinding of varying
surface mounted on said member, a cam block having a
angles of relief clearance on a drill.
variable pitch cam surface movable with said member
_10. Apparatus for grinding twist drills including, in
and gage block, means for locking said member in ad
combination, a support, a carriage adjustably mounted
justed
position, a gaging ?xture mounted on said second
_ on the support, a rotatable grinding wheel, a motor for 65
carriage arranged to support a drill mounting chuck to
rotating the grinding Wheel, a shaft mounted by the car
predetermine the position of the drill in the chuck by the
riage for rotational and axial movements, a holder for
for supporting the holder during a drill grinding operation,
a second member mounted for adjustment relative to
said ?rst member, cam means provided with a variable
pitch cam surface connected with one of said members,
a cam follower arranged for cooperation with the cam
mounting a drill to be ground, means connected with the
constant increment gaging surface, a cam follower car
shaft for supporting the holder during a drill grinding
ried by said shaft cooperating with the variable pitch
? operation, a'cup-shaped member mounted for rotational 70 cam surface, an arcuately shaped arm, means connected
adjustment relative to said shaft, cam means provided
with a variable pitch cam surface connected with said
with the shaft supporting the arm, said arm being ad~
cup-shaped member, a cam ‘follower mounted by the shaft
arranged for cooperation with the cam surface, and gage
holder removably supported on said arm and arranged to
means for determining the initial relation of the cam
drill grinding operation, the lengthwise movement of
justable in an are relative to said shaft, a drill chuck
move the drill relative to the grinding wheel during a
3,084,485
13
14
said shaft being controlled by said cam surface for deter
mining the angle of relief clearance ground on a drill.
cam surface, spring means biasing the cam follower into
constant engagement with the cam surface, an arcuately
shaped arm, means connected with the shaft supporting
the arm, said arm being adjustable in an are relative to
‘said shaft, a drill chuck holder removably supported on
said arm and arranged to move the drill relative to the
14. Apparatus for grinding twist drills including, in
combination, a base housing, a grinding wheel mounted
by the housing, a motor for rotating the grinding wheel,
a ?rst carriage supported on said housing and adjusta
ble along an axis parallel with the axis of rotation of the
grinding wheel, a second carriage mounted on said ?rst
grinding wheel during a drill grinding operation, the
lengthwise movement of said shaft being controlled by
said cam surface for determining the angle of relief
carriage and adjustable along an axis substantially normal
to the axis of the grinding wheel, a shaft mounted for 10 clearance ground on a drill.
oscillatory and axial movement on said second carriage,
References Cited in the ?le of this patent
a member arranged for adjustment about the axis of'the
shaft, a gage block having a constant increment gaging
UNITED STATES PATENTS
surface mounted on said member, means having a varia
ble pitch cam surface movable with said member and
gage block, a gaging ?xture mounted on said second
carriage arranged to support a drill mounting chuck to
predetermine the position of the drill in the chuck by
the constant increment gaging surface, a cam follower
carried by said shaft cooperating with the variable pitch 20
2,363,482
Clarke ______________ __ Nov. 28, 1944
2,598,055
2,632,983
Hogfors ______________ __ May 27, 1952
Kapnick _____________ __ Mar. 31, 1953
2,785,510
2,866,302
2,958,167
Garrison ____________ __ Mar. 19, 1957
Amiet _______________ __ Dec. 30, 1958
Mueller ______________ __ Nov. 1, 1960
2,972,839
Erdelyi ______________ __ Feb. 28, 1961
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