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Патент USA US2118304

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May 24, l938. l
-c. J. HERTLEIN
- 2,118,304
GRINDING MACHINE
Filed 001'.. 5, 1936
2 Sheets-Sheet 1
Wk
ATTORNEYS _
May 24, 1938.
'
c. J. HERTLEIN'-
ì
'. 2,M8,304
GRIND^1NG MACHINE
Filed 001;.l 3, 1956
w
â.
.
¿Sheets-Sheet 2
.__
xNvENToR
CARL J. HERTLEIN
ATTORNEYS
Patented May 24, 1938
2,118,304
UNITED STATES `rnfrlszfl-v'r OFFICE
2,118,304
GRINDING MACHINE
.Carl J. «Hertleîm Brooklyn, N. Y., yassìgnor of
`one-‘half to‘Franz Fuchs,1Br,ooklyn,.N.`Y.
Application October 3,
>25 Claims.
The invention relates in general to ‘a grinding
machine and specifically relates to thetcolfspin
dle and to the .associated motor `drive -o'f such
machines; lto the mechanism for shifting the
v`5 grinding tool vertically and to anorganization of
Fig. 4 is a view in `sideelevation showing the
side opposite vto -that »shown A'in Fig. l1 and .with
the upper portion .of the main -column ïbroken
away-'to show parts-of the micrometer screw-feed;
Fig. 5 >«is a horizontal sectional view >somewhat -5
control stops for limiting the travel ofthe -grind
enlarged and taken on the plane indicated ~by
ing tool.
the line '5-5 of Figs. '1 -and 4;
.
The present application constitutes a'compan
ion application to an adjustable work »'bed for
:10 supporting the work acted upon by the =tool and
associated mechanism herein disclosed‘and lwhich
application is »entitled “Adjustable work’bedf”, 'Se
rial No. 103,839 ñled October 3, >1936.
The primary object-of the invention vis y.to fim
‘Fig.»6 is a `detailed vertical sectional -view taken
on the plane indicated ¿by the line 6-’6 o‘f EFig-'5
looking in the-direction indicated byfthe arrow; $10
Iand
Fig. '7 `'is a detailed >plane View of `the `stops
shown kat Vthe-top of the carriage in Figs. l and-2.
‘In fthe drawings .there Ais shown 1a supporting
r prove and simplify -grinding machines =so as to
`Atank ‘I0 designed to holdthedrip lwater from the ‘15
provide among other things for both a coarse lfad
justment and setting of the grinding tool at Aan
yoperative working position, 'as rwell as a -»re’ñned
micromical adjustment of z«the tool ‘as circum
stances vmay indicate as desirable, »particularly in
the control and presetting of the'limits olf move
ment of the tool in its vertically «movable :direc
ftion during the coarser movements.
The invention has for'other objects the pro
tool. Mounted on a bed plate I I therein are two
'large -uprights, a vmain column ‘il 2 :and a ‘ffnulcrum
standard I3. Themain column comprises a rug
ged casting including side fpla'tes »'I4 and VI5 con
nected across their 'fronts lby a >face >plate 'I6 20
viding of easily fand quickly manipulated means
for controlling the ‘belt tension between the tool
spindle and the motor for driving Ithe same; fthe
providing of means for quickly releasing the -'ten
sion y'to facilitate shifting-of 'the belt; the -provid
ing of stops for limiting the movement --o‘f the
spindle, which stops can 'be quickly reset into
`approximate 'limiting yposition ' and thereafter
«more .accurately `»set to minutely'limit ‘the >desired.
`path of travel I‘o'f-thegrinding tool.
'Various other objects and advantages of the
35
invention lwillbe in kpart obvious from an inspec
'tion of the >accompanying drawings and in ‘part
will‘be vmore lfully set forth in the ‘following par
ticular description of one '-form of grinding-ma
.4 o
chine embodying the invention-»andthe invention
.also consists in certain new and novel "features
of construction and »combination of parts ïhere
yinafter `set ‘forth and claimed.
vIn vthe accompanying drawings:
Fig. '1 is a View largely >in side elevation and
with a .small portion at the bottom Aof -the lcar
riage broken away vto showthe lower plunger
vstopand‘illustrating a lpreferred embodiment o'f
the invention;
Fig. 2 is a view 'largely in iront elevation 0f
the 'right Vside of ‘the 'preceding -ligure fand Vpartly
provided with rforwardly projecting Iand .vertically
extending guideways 2|"I and il 8, land 'merging 'into
a wide spreading lbase I9. ~Slidably mounted -'on
.theLguideways :I-'I and vI8 is a vertically shiftable
carriage '-20 » of greater width ¿than the face >plate
I6 .and side flapping the forward-edge portion Aof
the side plates vIII and I5. ‘I'he lcarriage .isien
larged at its `‘lower portion to forma 4forwardly
extending 'horizontal extension 2| for supporting
the ' grinding :tool Aand associated parts. ‘The -eX
Itension 2| iis relatively wide Yas shown in Fig. '-2
.andhas supported thereon aspindle quill '22 ’in
vwhich is rotatably mounted »a tool spindle `<23
projecting from one end of the quill. A .grind
ing tool l21! Iis‘replaceably mounted on -the‘end of
the spindle 523 following conventional practices in
this respect. The opposite end lportion -of the
spindle> 'is provided with a driven multi-speed
spindle pulley 25, the free end of »which'is `jour
nalled in -a bearing 26.
40
The front "face vof the carriage ‘Z0 above vthe
extension 2l »is also provided with vertical guide
ways i211 in which is slidably mounted the basev
plate 28 of -an electric motor 29. ’The .motor shaft
'is provided with a spindle pulley '30 `in »driving 45
'relation with -.pulley -25 by means of a belt "31.
'Tension is maintained-'on the'beltby means of
a coiled spring 32 positioned between Vthe exten
sion -2`| and the underside of .the 'bracket‘33 "be
-tween'the `motor `-29 yand‘tl‘re sliding vbase plate '28 50
yin vertical section taken fon 'the plane indicated
las :best shown in Fig. 4. Opposite ends >of ‘the
spring 32 are maintained in vertical vposition 'by
byxthe line 2-2 of Fig, f1;
Fig. 3 isa rearelevational‘viewflooking‘at Fig. 1
a pair vof aligned spring guiding lingers 34 and
y35, the lower ñnger 35 »being :threaded and -pro
~ _from the :right vside thereof;
lvided Awith an >adjustable nut 36 :forming lan :ad- :55
2
2,118,304.
justable bearing for the lower end of the spring.
The motor and its associated base plate is lim
ited in its upward movement by the set screw
31 carried by a stop plate 38 at the top of the
carriage and with its lower end engaging in a
cup 39 formed on top of the motor. The set
screw is secured in its vertically adjusted posi
engaged by a headed screw 8l controlled by lever
82 (see top of Fig. 5). Each stop is provided with
an offset 83 threaded through which is a vertical
screw 64 secured in its adjusted place by a bind
"ing screw 55. In this way the vertical space be
tween adjacent vertical screws of the pair of
stops 55 and 51, for instance, may be accurately
set first by roughly setting the stops on the main
tion by means of a binding screw 4t.
From this construction it is understood that the column and then adjusting the vertical screws.
tension on the spring 32 is regulated by the Similarly, when it is desired to control the tool 10
manipulation of the nut 35 so as to cause the travel t0 the lower portion of the machine, the
motor to bear upwardly against the screw 31 lower pair of stops 58 and 53 may be utilized
which has been preset to give the desired tension and the space between their associated vertical
screws may likewise be accurately defined and
on the belt 3|.
15
‘
For the purpose of releasing the tension on the located.
Operating in this space'as suggested in Fig. 1
belt where it is desired lto shift the belt on its
pulleys to obtain variation in speed, a plunger is a carriage stop 55 comprising a plunger 'w31
4I is caused to react between carriage and motor urged forwardly by a spring 58. The plunger
to lower the motor against the resistance of the may be withdrawn into inoperative position>
spring 32. The plunger is actuated by a lever against the tension of spring 58 by means of a 20
42 pivoted to a bracket 43 carried by the stop head 69 particularly shown at the lower portion
plate 38 and to which the plunger is pivoted. of Fig. 1. The plunger is provided with a Ylock
The lower end of the plunger is received in’l a, ing pin 10 which, when the plunger is with
cup-like wear plate 44 similar to the cup 39 and drawn may be rotated into position to bear on
the adjacent surface 1I of the carriage to hold 25
25 likewise formed integral with the motor base plate
28.
~
In order to permit the displacement of th
motor from the carriage, the stop plateA 38 is ful
crumed on a pivot pin 45 and arranged so that
its free end 45 (see Fig. 7) normally held in place
by a screw 45', may be moved forwardly about
the pin 45 and swung out of the path ofthe base
plate 28 and associated parts. In this way the
motor can be slid upwardly until clear of the
guideways and thus be removed from the car
riage.
’
The carriage and with it the tool spindle and
its driving motor may be moved up and down
vertically as a single unit by means of a long,
40
forwardly extending, manually-actuated lever 41
provided intermediate its length with a fulcrum
nut 48 adjustably mounted in a slot 49 formed
in the fulcrum standaid I3 and which nut is se
cured in adjusted position by means of a clamp
45 controlled by a handle 58. The inner end of
the lever 41 terminates in a bearing wheel 5I
which is in sliding and lifting engagement with
a wear plate 52 formed on the underside of the
motor bracket 33.
The lever is provided at its
50 free end with a handle 53 and secured thereon
between the handle and fulcrum is a counter
weight 54 designed to balance substantially the
weight of the motor carriage and associated Ver
tically movable parts.
55
From this construction it is understood that
the fulcrum of the manually actuated lever is
adjusted vertically along the standard I3 so as
to bring the tool 24 in the region of the work to
be ground and with the fulcrum set in place
the operator by manipulating the lever may cause
the grinding tool to operate bodily in a vertical
direction while being rotated by the motor.
>For the purpose of providing limits to the per
missible vertical movement of the carriage when
so actuated grossly by the manipulation of the
lever, adjustable stops are provided between the
carriage and the main column. For this purpose
there is shown in Figs. l and 5 a vertically ex
tending channel plate 55 secured to the side plate
I4. Vertically adjustable on the channel plate
are two pairs of adjustable stationary stops num
bered downwardly in Fig. l, 53 to 58. Referring
to Fig. 5 it is noted that the stops are each se
cured in their relatively adjustable position by
75 means of a binding nut 60 within the channel
the carriage stop in its inoperative position. It
is herein suggested that a second stop 12 of a
similar plunger type be employed above the stop
66 and designed to operate between the upper
pair of fixed stops 55 and 51 in those cases where 30
it is desired to operate the grinding tool at rela
tively higher position off the base of the ma
chine. In the showing in Fig. 1 the plunger of
the upper stop 12 is withdrawn and locked in its
inoperative position and thus has no control, for .
the time being, on the possible movement of the
carriage.
Y
Considering the showing in Fig. 1 with the low
er carriage stop operative and the upper carriage
stop inoperative, it is understood that, by lower
`ing the lever handle from its horizontal position
shown, the grinding tool may be elevated from its
lowermost position, with plunger 51 engaging the
top of the lowermost vertical screw into an ele
vated position for a distance defined by the length
of the space'between the adjacent ends of the
vertical screws forming parts of the stops 58
and 59.
In those cases where a more refined vertical ad
justment of the tool spindleV and its associated 50
motor is desired, a micrometer lead screw feed
maybe employed. Such a feed includes a vertical
ly extending lead screw 13 mounted at opposite
ends in bearings 14 and 15 formed in the main
column.
A graduated hand wheel 15 is posi
L Ul
tioned at the top of the machine and is con
nected through a worm and gear drive 11 with
the lead screw 13 to rotate the same over angles
measured on the scale 18. This lead screw is
designed to be connected at will with the carriage 60
by means of a split nut 19. The 'nut is formed of
two halves which are mounted in a rectangular
casing 88 encircling the lead screw. The two
halves of the nut each include an outstanding top
ñange 8l which overlaps shoulders 82 formed in
a pair of end closures 83 of the casing 88 to per
mit relative movement of the nut halves trans
versely of the lead screw while holding the nut
from movement in all other directions. Oppos
ing springs 84 and 85 bear on the two halves of 70
the split nut and tend normally to force the nut
into threaded engagement with the lead screw.
The two parts of the split nut are arranged so
as to be separated into their inoperative position,
spaced from the lead screw by means of a pair 75
>2,1.1533304
of cams 8.6 -positioned between the two .halves 'of
the nut and moved to and .from .operative posi
ëti'onsibylmeansof a split «nut lever ril?! in .the -form
The casing isl secured in a verti
.cally adjustable 'positionfonfthe :carriage ."‘byîmeans
Íofïa bindingfscrewllß "extending through a verti
"cal-'slot 891m thecarriage. vThe screwfhasza'wide
-'hea'dfßll engaging the :inner sidepf îthe :carriage
on :opposite sides of the 'slot'a's more particularly
shown in Figs. ‘5 xand ‘16.
' .
:In .operation .and :assuming 7that v`the split `nut
ás in its released, inoperative "position and vthat
:it as .desired'to operate 'the ygrinding itool 'Within
justmentr of :the stops, ïherein‘before described, the
`inanipulation'of .the long .controlîlever :Will raise
‘or lower. the igrinding î-.tool within ithe ¿preset l»limits
tof rtravel. Should it îbe desired «to workin atheup
portion fof tthe :available space, for’instance,
..20 :the :lower carriage stop is '.withdrawn’into .fits-in
operative :position sand :by >ite-'rotating >the yplung
er 'controlling ythezupper fstop,1it .may be caused fto
'project “into vand thus .operate iin fthe space vbe
tween .either the .upper or ëlower Hpairs -of stops.
Should ‘it be .desired to set vthe :grinding tool
so .as to fix .or substantiallygñxiniits axis of .-rota
tion, thesplit nut .fleverfis fshiftedso -as to .render
y‘its associated cams ¿inoperative ëa-nd Ithus, permit
the proper plunger with .-the'proper .-.stop‘toget
all of the similarly located areas ground alike.
yIn this way one preset arrangement .of the stops
permits the identical grinding of any number vof
Vtools for which >the stops were Yinitially set.
When operating in connection -.with the >work
supporting and locating bed .plate featured :in the
companion application -above identified, there 'is
provided a precision grinding vmachine capable
of accurately grinding lwork such as 4cutting tools
of various'kinds and which in general is 'capable
of accurately grinding a .multiplicity of 'different
contoured surfaces.
‘
While there have been shown, described and
pointed out'in the annexed claims, certain novel
features of the invention, it will be understood
that various omissions,~substitutions and'changes
'in the form `and details of the device‘illustrated
and in its operation may be made -by those vskilled
in the art without departing from the spirit of
the invention.
I claim:
1. In a grinding machine, the combination of
a base provided with a main column and a 'ful
crum standard, a carriage slidably mounted ïi‘or 25
vertical movement Von the column, >a -motor slid
yably mounted for-vertical movement on the car
riage, .a tool spindle journalled inthe lower por
-theopposing spring'to move rthe split nut halves
into engagement :with the lead screw, rafter’which,
tion of the carriage vbeneath ltheemotor for rotary
- lby the Amanipulation -of ïthe graduated 'hand-Wheel
the spindle from -the-motor, va'spring between the
carriage-and motor tending to elevate vthe motor
Aon the carriage, a .stop :between the 'motor and
carriage :for limiting the -upward movement ofthe
.fat the .top of the .machina va 'reñned adjustment
»in :the Vlocation .of the laxis of `the ygrinding tool
.may be obtained. Asithis'micromical .adjustment
.c'a'n'ibe‘ obtained :at .fany'position within Vthe per
vmissible Avertical :limits'gof movement of the tool,
l-it 1is possible Ito lquickly locatev the fgrinding v.tool
in its approximate-'desired .position :by the rough
coarse movement `.provided ¿by the .lever :and then
by `moving .the split nut .organization 4into lfen
g'agement with lthe lead 'screw at :any position
V.whel-’e’the trough adjustment may have~ located
.-it, a zreñned variation in 'tool -¿positions :may :be
quickly attained.
'
movement about a horizontal axis, .a belt 'driving
`motor on .the carriage, ra lever "fulcrumed on ‘the 35
standard, having .a handle at one rend and at the
other end engaging `beneath the motorto elevate
the same together with >the ycarriage 'on the ,main
column.
2. In a grinding machine, 'the'combination of av
base provided vwith a main column, a carriage
slidably mounted `for vertical movement on the
column, a motor slidably mounted `for vertical
movement on the carriagepa tool spindle >~jour
nalled Vin the carriage Ábeneath the motor `for ro
tary movement about Aa vhorizontal axis, a :belt
:During the .course of operating :the machine
and wherein it may be desirable to change fthe
.speed voi” rotation >of -the .grinding tool ,' tension on .driving the spindle from Kthe motor, aspringg Abe
âthe belt may be-quic'kly released simply :by :pulling . tween Ythe carriage and vrnotorvtending to elevate
Vdown on the belt Élever, :the .belt Amay -be .shifted the motor on .the carriage, a vstop between Vthe
«conventionally from .one to another -pair Vof .pul
îleys, -and releasing ¿tension on'the plunger ¿permit
‘the elevating spring to restore tension on the-belt.
'Should the ybelt become too tight or itoo :loose iin
practice, 'the adjusting screw-.at the '.top'of the
--motor may ‘be unlocked from .its previous vset
ting, reset and :relocked lin its reset position.
By means of va ydevice Vsuch asis ¿herein dis
closed, extremely refined accuracy .in setting v'the
motor and carriage îfor limiting-theupward move- -
ment lof the motor on the carriage, and control
means for shifting the lassembly :including the
motor and carriage Aon the main 'column .thereby
to move the tool spindle vertically.
3. In a grinding machine, the combination of a
vertically disposed column provided with a guide
-Way, a -carriage mounted for 'sliding movement
grinding tool and in moving 'it .to and from .any thereon, a'grinding tool spindle rotatably mount
'preset locations vmay be :obtained quickly, where ed in the carriage, a standard, a lever having yits 160
-quick shifting :is desired and ¿in :moving 'it :over > fulcrum adjustably mounted-in the standard, said
minute and restricted distances ~maybe obtained lever being connected at one -end to the carriage
~-wherever accurate and :refined :work ‘is desired. to move thesame vertically/'inthe guideway, hav
'The stops ycontrolling'ìthe vertical -'adjustment ing its other end_provided‘with an actuating ¿han-Y
dle and having a weight carried ’thereby between
ofthe tool -maybe further .used :as .when grind
ing .a number of tools which are similar vin that the handle and standardand tending to counter
they contain‘a >number of diiferent areas ofthe weight the carriage and parts carried thereby.
4. In a‘grinding machine, `the combination of -a
same v--conformatio-n. For instance, the'ñrst area
may .be ground with the plunger -ß‘l limited Ain vertically disposed column .provided with'a guide
-its movement in `one direction by-stop 45-9. yThe way, a carriage mounted for sliding movement
second-area «with plunger '12, 'for instance, >is lim
thereon, a grinding tool spindle :rotatably mount
ited in one vdirection of movement by ystop :5-1; ‘ ed in the carriage, Va standard and a manually
:the thirdarea again'using plunger-.651 Land limited actuated control lever .adjustably fulcrumed 4.to
in one direction of movement by stop 58 and so the standard and operatively :connected V.to >,the
22,75 on. .In-general :all .that Tis necessary Eis toengage carriage to `move the Ítool spindle 'vertically rover
2,118,304
distances controlled by the location of the lever
fulcrum.
5. In a grinding machine, the combination of a
structural part of the machine, a tool spindle
Vto act therethrough to lift the carriage with its
associated tool spindle.
10. In a grinding tool, the combination of a
mounted therein for rotary movement, a motor, a
belted connection between the motor and spindle,
a spring reacting between the motor and struc
tural part for placing tension on the belted con
nection, and means for regulating the tension
placed on the belted connection.
6. In a grinding machine, the combination oi a
vertically disposed main column provided with a
guideway, a carriage slidably Vmounted for verti
cal movement on the guideway, a tool spindle
journalled in the carriage for rotary movement,
an electric motor slidably mounted for vertical
movement on the. carriage and provided with a
multi-speed pulley in belted driving engagement
with the spindle in all positions thereof, means
for adjusting the location ci' the motor on the
carriage thereby to set it relative tothe spindle
and manually actuated means engaging the car
riage for shifting the spindle and motor when so
relatively adjusted, together vertically as a unit
and a resilient support between the motor and
carriage acting to maintain tension on the belt.
7. In a grinding machine, the combination of a
carriage mounted for vertical movement, a grind
ing spindle mounted for rotary movement in the
30 carriage and provided with a driving pulley, a
motor guided for vertical movement on the car
riage and provided with a pulley, a belt forming
a driving connection between the motor and spin
dle pulleys, a coiled spring located between the
carriage and motor, tending to elevate the motor
upwardly away from the spindle and thus place
tension on the belt and adjustable means for
limiting the elevating movement of the motor un
der the tension from the spring.
8. In a grinding machine, the combination of a
40
carriage mounted for vertical movement, a grind
ing spindle mounted for rotary movement in the
carriage and provided with a driving pulley, a
motor guided for vertical movement on the car
45 riage and provided with a pulley, a belt forming
a driving connection between the motor and spin
dle pulleys, a coiled spring located between the
carriage and motor, tending to elevate the motor
upwardly away from the spindle and thus place
50 tension on the belt and adjustable means for
limiting the elevating movement of the motor un
der the tension from the spring, and manually
actuating means for lowering the motor against
the tension of said spring to release the tension
55 on the belt and thus permit easy shifting of the
belt on its pulleys.
carriage
9. In amounted
grindingfor
machine,
verticalthe
movement,
combination
a grind
of
ing spindle mounted for rotary movement in the
carriage and provided with a driving pulley, a
motor guided for vertical movement on the car
riage
driving
and
connection
provided between
with a pulley,
the motor
a beltand
forming
spindle
pulleys, a coiled spring located between the car
65
riage and motor, tending to elevatev the motor up
wardly away from the spindle and thus place ten
sion on the belt, means for limiting the elevating
movement of the motor under the tension from
the spring, manually actuating means for lower
ing the motor against the tension of said spring
to release the tension on the belt and thus per
mit easy shifting of the belt on its pulleys, and
manually actuated means for elevating the motor
75 and in causing the motor to bear against said stop
spindle, a spindle quill therefore, a spindle pul
ley in driving engagement with the spindle, a
motor provided with a spindle pulley, a belted
connection between the two pulleys and a spring
between the quill and motor, tending to support
the motor from the quill and reacting between
the spindle and motor tending to place the belt
under tension, and an adjustable stop for one
end of the spring for varying the tension of the
spring and thus >varying the tension of the belt.
1l. In a grinding machine, the combination
of a carriage, a spindle quill carried thereby, a 15
spindle rotatably mounted in the quill, a spindle
pulley journalled in the carriage and in driving
engagement with the spindle, a motor mounted
for vertical movement, a motor pulley, a belt
connecting the two pulleys, a spring engaging the 20
motor and urging the same upwardly against
the tension of the spindle pulley, means for vary
ing the tension of the spring, a stop for limiting
the upward movement of the motor, and a plung
er reacting between the carriage. and motor to' 25
lower the motor against the spring tension
thereby to release the tension on the belt.
12. In a grinding machine, the combination of
a carriage, a spindle quill carried thereby, a spin
dle rotatably mounted in the quill, a spindle pul 30
ley journalled in the carriage and in driving en
gagement with the spindle, a motor mounted for
vertical movement, a motor pulley, a belt con
necting the twol pulleys,V a spring engaging the
motor and urging the same upwardly against the 35
tension of the spindle pulley, means for varying
the tension of the spring and an adjustable screw
stop for limiting the upward movement of the
motor, a plunger reacting between the carriage
and motor to lower the moto-r against the spring 40
tension thereby to release the tension on the belt,
and said plunger and adjustable stops mounted
to be shifted into an inoperative position clear
of the path of upward movement of the motor,
thereby to permit the motor to be lifted off the 45
carriage.
'
‘
’
13. In a grinding machine, the combination of
a main column provided with a pair of vertically
adjustable and relatively stationary stops, a tool
supporting carriage mounted on the column for
vertical movement, said carriage provided with
a stop operable between the pair of stationary
stops to limit the vertical movement of the car
riage in both directions and means for raising and
lowering the carriage, and said carriage stop con
stituting a spring pressed plunger adapted to
be retracted into .an inoperative position free of
the stationary stops.
'
14. In a grinding machine, the combination of
a grinding tool supporting carriage guided for 60
vertical movement, two means each operatively
connected to the carriage to shift it vertically in
dependently of the other.' one of said means com
prising a manually actuated lever for quick shift
ing into an approximately correct position and 65
theothercomprisingamanually actuated microm
eter lead screw for refined adjustment of the
carriage into the desired correct position and con
trol means for connecting and disconnecting said
lead screw from the carriage at will and resist 70
ing actuation by the lever when connecting the
lead screw with the carriage and said lever per
mitting actuation of the carriage by the lead
screw.
15. In a grinding machine, the combinationV of 75
2,118,304
a mainïcolumn, a carriagemounted’thereon for
vertical movement, a grindingtool mounted :for
rotary movement in thecarriage, mechanism for
shifting vthe carriage and withçit the grindingtool
a column provided with two pairs of vertically
adjustable vand `relatively stationary stops, _a tool
supporting carriage mounted on the column for
vertical-movement, ksaid vcarriage provided >with
two stops, one for each pair 'of stationary stops
and/each arranged for limiting,V the vertical `move
ment of the carriage in both directions when
vertically on the column, said mechanism includ
ing la 4vertically yextending lead screw mounted
in the column, manually actuated means for ro
tating the -lead screw, a two-part split nut‘ located between its associated stationary stops
mounted in the carriage and adapted to engage
the lead screw whereby the rotation of the lead
screw will shift the carriage vertically, means in
cluding a vertical slot in the carriage and a bind
ing screw carried by the nut and extending
through the slot for adjustably securing the split
15 nut to the carriage at any position along the
length of the lead screw, and control means
for moving the two parts of the split nut to
and from their operative engagement with op
20
posite sides of the lead screw.
16. In a grinding machine, the combination of
a grinding tool, mounted for rotary movement
about its axis and for shifting the tool vertical
ly, a support for said tool, manually controlled
mechanism for minutely shifting the support and
25 with it the grinding tool into a desired position,
said mechanism including a vertically extending
lead screw mounted for rotary movement and
otherwise fixed relative to the support, a split
nut for engaging the feed screw, a casing for the
30 split nut provided with means for securing the
split nut to the tool support in vertically adjusted
position relative to» both the support and the lead
and each carriage stop movable into an inoper
ative, out of the way position whereby either of l0
the two sets of stops may be utilized at will to
control the limits of permissible movement of
the carriage.
21. In a grinding machine, the combination of
a main column, a carriage slidably mounted on 15
the column for vertical movement, a grinding
tool journalled in the carriage for rotary move
ment about- an axis iixed relative to the carriage,
means including adjustable stops acting between
the carriage and column for limiting the extent 20
of and for locating the permissible location of
travel of the carriage and thus of the tool axis,
manually actuated means for quickly and roughly
locating the carriage to bring the tool axis ap
proximately into a desired position and manually 25
actuated micrometrical feed means acting on
the carriage when so roughly located to bring
the tool axis more accurately into the desired
position.
22. In a grinding machine, the combination of 30
a main column, a carriage slidably mounted thereon
for vertical movement, a grinding tool journalled
screw and resilient means between the casing on the carriage for rotary movement, a channel
and split nut tending to maintain the nut in plate carried by the column, a plurality of stops
35 engagement with the lead screw.
vlocated on the channel plate, means for adjust 35
17. In a grinding machine, the combination of ing the stops relative to each other, means for
a grinding tool journalled for rotary movement locking the stops in their adjusted positions, a
about a horizontal axis, a ñat plate constituting set screw carried by each stop, means for locking
a vertically shiftable carriage for supporting the each set screw to its associated stop and a man
40 same, a manually actuated lever for shifting the
ually actuated retractable stop carried by the
carriage vertically, a lead screw and split nut carriage and disposed when in operable position 40
organization for shifting the carriage vertical
between a pair of said set screws and disposed
ly, said organization including a casing, means when in an inoperative position clear of the
for detachably securing the casing to the car
stops on the channel plate.
riage at will, a two-part split nut slidably mount
23. In a grinding machine, the combination of
ed in the casing, means tending to cause the two
.a main column, a carriage slidably mounted
parts of the nut to engage the lead screw and thereon for vertical movement, a -grinding tool
control means for moving the split nut from its journalled for rotary movement on the carriage
operative engagement with the lead screw.
and movable vertically therewith, means for con
18. In a grinding machine, the combination of trolling the limits of movement of the grinding
50
a carriage mounted for vertical movement, a tool while operating in two zones of movement, 50
grinding spindle mounted for rotary movement said means comprising a channel plate carried
in the carriage and provided with a driving pul
by the column, four relatively stationary stops
ley, a motor guided for vertical movement on the slidably mounted on the channel plate, one above
55 carriage and provided with a pulley, a belt form
the other, means for securing each stop to the
ing a driving connection between the motor and channel plate, each stop provided with a set screw 55
spindle pulleys and a coiled spring located be
and with the two upper and the two lower set
tween the carriage and motor for resiliently sup
screws facing each other to form two adjustable
porting the motor from the carriage and means space deñning means, the carriage provided with
60 for adjusting the tension on the spring thereby
two retractable stops, one spaced above the other 60
to regulate the tension on the belt.
and both adapted to operate in either of the
19. In a grinding machine, the combination of spaces defined by the upper or lower pairs of
a main column provided with a pair of vertically relatively fixed stops whereby with one setting
adjustable and relatively stationary stops, a tool of the relatively fixed stops the carriage may be
65 supporting carriage mounted on the column'for
operated selectively in either a high or a low zone 65
vertical movement, said carriage provided with a of operation.
stop operable between the pair of stationary stops
24. In a grinding machine, the combination of
to limit the vertical movement of the carriage in a carriage mounted for vertical movement, a
both directions and the stop on the carriage in
grinding tool journalled for rotary movement on
70 cluding a spring pressed element disposed nor
the carriage and movable vertically therewith, a
mally in line between the pair of stops on the motor for driving the tool provided with a base 70
column and said element adapted to be with
slidably mounted on the carriage for vertical
drawn from said path to permit the carriage to movement, an adjustable stop between the car
be moved independently of the stops.
riage and motor base for locating the motor in a
75
20. In a grinding machine, the combination of preset position on the carriage and means react 75
6
2,118,304
ing between the motor base land carriage for
forcing the motor into said position prefixed by
the adjustment of the stops.
25. In a grinding machine, the combination of
a carriage mounted for Vertical movement, a
grinding tool journalled for rotary movement
on the carriage and movable vertically there
with, a motor for driving the tool provided with
a base slidably mounted kon the carriage for ver
tical movement and'an adjustable stop between
the carriage and motor base for locating the
motor in a preset position on the carriage, said
stop being movable into an inoperative position
to permit the motor and its base to be slid ofi
the carriage.
CARL J. HERTLEIN.
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