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Opt. 15, 1946.,
H. A. SILVEN
2,409,450
GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM
Filed Oct. 29, 1945
65 64 66 67 as
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2 Sheets-Sheet 1
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2046"“
26 29 22
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1926
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‘ HERBERT A. SILVEN
1;. i5, 26..
H_ A‘ $|LVEN
I
2,499,450
GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM
Filed Oct. 29, 1945
86 '-->
8/ L, 10
11
65
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2 Sheets-Sheet 2
HERBERT A. S'ILVEN
a»,
.
Patented Oct. 15,’ 1,946
-’
UNI'IJ'ED STATES
2,409,450
PATENT OFFICE
2,409,450
GRINDING WHEEL SPINDLE RECIPROCAT
3 ~
ING MECHANISM
Herbert A. Silven, Worcester, Mass., assignor to
Norton Company, Worcester, Mass., a corpora
tion of Massachusetts
Application October 29, 1945, Serial No. 625,374
11 Claims.
(G1. 51-1-34)
1
2
‘This invention relates to grinding machines
and more particularly to a grinding wheel spindle
elevation and the stroke adjusting mechanism in
reciprocating and positioning mechanism.
One object of the invention is to provide a sim
ple and thoroughly practical grinding wheel spin
dle reciprocating mechanism. Another object of
the invention is to provide a grinding wheel spin
dle reciprocating and positioning mechanism in
which a ?uid motor is arranged to impart the re
ciprocatory motion to the wheel spindle. An
other object of the invention is to provide a man
section;
Fig. 6 is a fragmentary vertical sectional view,
taken approximately on the line 6--6 of Fig. 2;
Fig. '7 is’ a fragmentary sectional view, on an
enlarged scale, of the spring pressed ball for
engaging the plate and locating and holding the
control lever in position;
Fig. 8 is a fragmentary plan view, on an en
]0 larged scale, of the plate having notches therein
ually operable control lever which is arranged
to stop and start the ?uid motor for reciprocat
for locating the control lever;
Fig. 9 is a fragmentary vertical sectional view,
taken approximately on the line 9--9 of Fig. 3,
ing the spindle when moved to one direction and
through the cam and lever mechanism for dis
when moved in the opposite direction to stop‘ ]5 connecting the ?uid motor;
Fig. 10 is a fragmentary staggered sectional
the wheel spindle reciprocating motor and manu
view, taken approximately on the line Ill-l0 of
ally to move the wheel spindle axially to position
Fig. 3, through the ?uid control valve and also
the grinding wheel in a predetermined position
through the spindle locking mechanism with the
for a grinding operation. Another object of the
invention is to provide a wheel spindle recipro 20 control lever in a spindle reciprocating position;
Fig. 11 is a fragmentary sectional view, taken
cating mechanism in which a manually operable
approximately on the line ll--ll of Fig. 3,
lever serves to actuate the control valve for start
through the control valve with the control lever
ing and stopping a ?uid motor for reciprocating
in a spindle reciprocating position;
the wheel spindle and also to disconnect the motor
Fig. 12 is‘a fragmentary sectional view, taken
from the spindle when the motor is stopped so 25
approximately on ‘the line li—l_l, but with the
as to facilitate a manual positioning of the wheel
valve and‘control lever in an intermediate posi
spindle for a shoulder grinding operation.
tion;
,
This invention accordingly consists in the fea
‘Fig. 13 is a fragmentary sectional view, taken
tures of construction, combinations of elements,
and arrangements of parts as will be exempli?ed 30 approximately on the line' Ill-l0, but with the
valve and control lever in an intermediate posi
in the structure to be hereinafter described and
tion;
the scope of the application of which will be in
Fig. 14 is a fragmentary sectional view, taken
dicated in the following claims.
approximately on the line lI--| I, but with the
In the accompanying drawings, in which is
shown one of various possible embodiments of 35 valve and control lever in a spindle stopped po
sition; and
r
the mechanical features of this invention,
Fig. 15 is a fragmentary sectional view, taken
Fig. 1 is a fragmentary front view, partly in
approximately on the line l0—l0 but with the
section, of a grinding machine wheel slide em
bodying the invention;
Fig. 2 is a fragmentary cross sectional view,
through the wheel slide, showing the wheel spin
dle reciprocating mechanism partly in section
and partly in elevation;
valve and control lever in a spindle stopped po
40 sition.
A grinding machine embodying this invention
has been illustrated in the drawings comprising
a base In which supports a transversely movable
grinding wheel slide II on a transversely arranged
Fig. 3 is a fragmentary vertical sectional view 45 V-way‘ l2 and a ?at-way [3 formed on the base
showing the means for disconnecting the recip
It} A feeding mechanism is provided for feed-1
rocating lever and also showing the control
ing the wheel slide transversely relative, to the
base‘ In comprising, the old and well known, ro
valve;
,
Fig. 4 is a fragmentary horizontal sectional
tatable mounted feed screw 14 which meshes with
view, taken approximately on the line' 4—4 of 50 a half nut [5 depending from the under side of
“ the wheel slide II.
V
Fig. 2, showing the piston and cylinder and re
The wheel slide l l is provided with spindle bear
ciprocation lever mechanism;
ings (not shown) to support a rotatable grinding
Fig. 5 is a fragmentary horizontal sectional
wheel spindle I6 for a rotary and axial recipro
'view, taken approximately on theline 5-—5 of
Fig. 1, showing the ?uid motor control valve in 55 eating movement relative thereto- A grinding
2,409,450
4
3
wheel I‘! is mounted at the left hand end of the
wheel spindle l6 (Fig. 1) and a V-groove pulley
I3 is mounted on the right hand end of the wheel
spindle l6 with V-belts in position.
A wheel spindle positioning and reciprocating
mechanism is provided for reciprocating and
moving the wheel spindle l6 axially within its
bearings. This mechanism may comprise a
?anged sleeve 20 which is held in a ?xed position.
It will be readily apparent from the foregoing dis
closure that the stop screw 53 serves to limit the
rotation of the cam 50 and the control lever 52
in a clockwise direction thereby controlling the
speed of the reciprocation of the wheel spindle
Hi. When the control lever 52 is rocked in a
counterclockwise direction into position 522), the
cam 55 engaging the screw 43 will rock the arm
2‘ in a counterclockwise direction (Fig. 9). This
on the wheel spindle It by means of a set screw 10 movement of the rock arm 41 serves to rock the
2i. A collar 22 is keyed on the sleeve 26 so as to
rock arm 45 (Fig. 3) also in a counterclockwise
form an annular groove 23. A pair of lock nuts
direction so as to raise the downwardly project
or collars 24 are threaded onto the right hand
end of the sleeve 2. The collars 24 serve to
adjust the collar 22 to provide for taking up lost
motion between the groove 23 and an annular
ring 25 which mates with the groove 23.
A yoked arm 26 is pivotally supported on a rock
shaft 27 and is provided with a pair of diametri
callyopposed studs 28 and 29 which are arranged
to mate with diametrically opposed holes formed
in the ring 25 thereby supporting the ring 25.
The yoked arm 26 also supports a stud 30 which
engages an elongated slot 3| formed in the end
ing lug 53 into a broken line position 43b so that
it is out of engagement with the groove 44. It
will be readily apparent from the foregoing dis
closure that when the lug 43 is moved out of
engagement with the slot 44 that the arm 34 will
be disconnected from the yoked member 25.
It is desirable to provide a locating device for
locating the control lever 52 in the desired and
predetermined positions. The control lever 52
is provided with a spring pressed ball 55 which
rides upon an arcuate shaped plate 56. The
arcuate shaped plate 56 is provided with locating
of a rock arm 32. The rock arm 32 is keyed to 25 notches 57 and 58 (Fig. 8) which are engaged
the lower end of a rock shaft 33. A rock arm 34
by the spring pressed ball 55 when the control
is rotatably supported near the upper end of the
rock shaft 33.
v A hydraulically operated motor is provided for
oscillating the yoked member 26 so as to impart
a reciprocatory movement to the wheel spindle
is for a plunge-cut grinding operation.
lever 52 is shifted. The control lever 52 (Fig. 1)
is shown in a spindle reciprocating position, that
is, with the stop screw 53 on the cam 55 engaging
the'stop surface 55 (Fig. 9). When it is desired
to stop the spindle reciprocation, the control lever
This
52 is moved in a counterclockwise direction, to
hydraulic motor is substantially the same as that
position 5212, until the ball 55 engages the notch
58 on the arcuate shaped plate 55 in which posi
‘shown in the prior U. S. patent t
Wallace H.
Wood, No. 2,212,871, dated August 27, 1940, to
tion the rock arm 40 will be rocked to move the
which reference may be had details of disclosure
not contained herein. This motor may comprise
a cylinder 35 (Fig. 4) which supports a slidably
lug 43 into position 431), disengaging from the
groove 45, thereby disconnecting the rock arm 34
and thus preventing further reciprocation of the
mounted piston 35. The piston 36 is ?xedly
wheel spindle [6.
mounted on one end of a piston rod 31. The other
A control valve 65 is formed integral with the
cylinder 35. This control valve is identical with
shaped member 38 having an annular groove 39
that shown in the prior U. S. patent to Wood, No.
formed therein. The rock arm 34 is provided at
2,212,871, above referred to and comprises a slid
its right hand end (Fig. bl) with a yoked end
ably mounted pilot valve 6| having a valve stem
which engages the groove 39 so that reciprocatory
62. The pilot valveBi is provided with a central
movement of the piston 35 will be transmitted to
aperture that contains a slidably mounted shuttle~
oscillate the rock arm 34.
type reversing valve 53. An actuating arm 64 is
It is desirable to provide suitable mechanism
?xedly mounted von the end of the piston rod 31.
whereby the rock arm 34 may be readily con
The actuating arm 64 projects upwardly into the
nected to or disconnected from the rock shaft 50 path of a pair of spaced adjustably mounted dogs
33 so that the ?uid motor may be readily con
55 and 6,5 which are in turn adjustably supported
nected or disconnected from the yoked member
on the pilot valve stem 62. It will be readily
‘26 when desired. A pivotally mounted rock arm
apparent from the foregoing disclosure that the
43 '(Fig. 3) passes through a vertical slot~4l (Fig.
movement of the piston 35 will impart a corre
6) formed in the rock shaft 33 and is pivotally 55 sponding movement to the arm 64 the upper end
connected with the rock shaft 33 by means of a
of which is arranged in the path of the dogs 55
stud '52. The rock arm 45 is provided with a
and 66 so that the reciprocatory movement of the
downwardly projecting integral lug 43 which is
piston 35 will cause the actuating arm 64 to shift
arranged to engage a notch or groove 54 formed
the pilot valve GI and the reversing valve 63 auto
in the rock arm 35. A compression spring 45 nor 60 matically to change the direction of movement of
mally serves to hold the rock arm 55 with the
the piston 35. The dogs 55 and 56 are slidably
downwardly projecting lug 53 in engagement with
guided by a slide rod 5?.
the groove 44. ‘The other end of the rock arm 45
In order to facilitate adjustment of the length
is'provided with a projecting lug 46 (Figs.v3 and
of the reciprocatory stroke of the wheel spindle
9) which is arrangedto be engaged by a rock arm 65 IE, it is desirable to provide readily accessible
45 which is pivotally supported on a stud 43.
means for adjusting the position of the dogs 65
‘ "The other‘ end of the rock arm 4? is provided
and 5'5. The valve stem 62 is provided with a
with an adjustably supported screw 58 which is
right hand threaded portion 69 and a left hand
_ arranged to engage an actuating cam 55. The
threaded portion 75 which mate with correspond
cam 50 is ?xedly mounted on a rock shaft 5i and
ingly threaded apertures in the dogs 65 and‘ 65
is arranged to- be actuated by means of a man
respectively. To facilitate adjustment of the
ually operable control lever 52. A stop screw 53
reciprocatory stroke, a manually operable knob
is adjustably mounted on the cam 55 and is
‘H is mounted on the outer end of a shaft 72 (Fig.
arranged to engage a ?xed stop surface 54 which
5). .The shaft 12 is journalled in bearings 13
is ?xedly mounted'relative to‘ the wheel slide ll.
and 14 formed integrally with the left hand cover
end of‘the piston rod 3'! is provided with a spool
2,4891450
of the pilot valve 68.» The shaft 12 is provided
at its rear end with a bevel gear‘ ‘I5 which meshes
with a bevel bear 16vrotatab1y mounted on a
6
96 to a‘suitable supply oil reservoir, which may
be in the base of the grinding machine.
When thelcontrol lever‘ 52 is shifted into the
stud ‘IT. A gear ‘I8 is ?xedly mounted relative
intermediate position so that the control lever is
to the bevel gear ‘I6 and meshes‘ with a gear 19 5 in the broken line position 52a (Figs. 12 and 13)
which is ?xedly mounted on the pilot valve stem
?uid under pressure can not pass from the pipe
62. It will be readily apparent‘ from the fore
98 50 that‘ the ?uid to the ?uid motor 68 is stopped
_ going disclosure that a rotary adjustmentof the
thus holding the parts in a stationary position.
knob ‘II will be transmitted-through the gear‘
In this position of the control lever 52 the pro-v
mechanism above described to rotate the pilot lO jecting lug 43 on the rock arm 48 is raised‘ in
valve stem 62 and due to the right and left end
position with the lug in position 43a, but still
threaded portions 69 and ‘I8 will cause the dogs
remaining in engagement with the groove 44.v
65 and 66 respectively to move toward or from
In this position 52a of the ‘control lever the ?uid
each other so as to regulate the reciprocatory
motor 68 is therefore stopped thus locking the
stroke; of the fluid motor‘ piston 36 and also the 15 wheel spindle I6 against-pa reciprocatory motion
‘reciprocatory stroke of the wheel spindle I6. A
f or truing the grinding wheel I'I. ‘
stop screw 68 (Fig. 1) passes through a clearance
When it is desired to manually position the
hole in the dog 65 through a clearance hole in
wheel spindle I6 for shoulder grinding the con
the arm 64 and it is screw threaded into the dog
trol lever 52 may be swung further in a counter;
66.‘ The stop'screw 68 serves to limit the out 20 clockwise direction to position 521) which moveward movement of the dogs 65 and 66 thus limit
ment raises the projecting lug 43 out of engage
ing the extreme reciprooatory stroke of the pis
ment with the groove 44 and the cam 82 rotates
ton 36 and the wheel spindle I6 as desired.
into’ engagement with the end of the slidably
‘ It is desirable to provide a control valve for
mounted plunger 83 to transmit a manually axial
stopping and starting the ?uid motor and also 25 movement to the wheel spindle I6 through the
to provide means whereby the wheel spindle I6
yoked member 26 so that the grinding wheel I‘!
may be positively moved into a ?xed position
may be manually moved into operative engage
for shoulder grinding or may be manually trav
ment with a shoulder to be ground on a work
ersed in the grinding between shoulders. In the
piece. When the control lever 52 is moved into
preferred construction it is desirable to arrange 30 position 52b (Figs. 14 and 15) ?uid from the
this mechanism so that the manually operable
motor 68 may exhaust through pipe 92 through»
control lever 52 will not only actuate the rock
a passage 63 formed in the valve casing and
arm 48 but also control the stopping and start
into the exhaust chamber 84 and‘out through a
ing of the ?uidmotor 68 and the traversing and
passage 95 which extends by means of a drilled
positioning movement of the wheel spindle I6.
hole (Fig. 3) through the cam-82, thus reliev
The rock shaft 5| is preferably provided with an
ing the ?uid pressure within the motor 68 when
integral valve member 8| which is rotatably sup
the rock arm 34 is disconnected and the wheel
ported within a valve bodyi?xedly mounted rel
spindle I6 is under manual control of the con
ative to the wheel slide I I'. A‘ cam 82 is mounted
trol lever 52. It vwill be readily apparent from
on the right hand end of the valve member 6|.
the foregoing disclosure that by manual actua
The cam member 82 is arranged when rotated to
tion of the control lever 52, the lug 43 of the
engage and actuate a slidably mountedplunger
83. The plunger 83 is provided with a groove 84
which is engaged by a stud 85. The stud 85
rock arm 48 may be engaged with the groove 44
of the rock arm 34 at the same timethe valve
member BI is shifted to start the ?uid motor 68
is mounted within an upwardly extending boss 45 in starting positive reciprocation of the ‘grinding
86 formed integral with ‘the yoked member 26.
wheel spindle I6.
I
A compression spring 81 normally urges the
' Similarly when it is desired to stop thewheel
plunger 83 toward the right (Fig. 10). A pair
spindle I6 for a truing operation, the control
of adjustably positioned stop screws 88 and 89
lever 52 may be positioned in broken line posi
are positioned in the path of ‘the boss 86 and 50 tions 52a (Figs. 12 and 13) in which position the
serve to limit the swinging movement of the
?uid under pressure is cut off from the ?uidmo
yoked member 26. It will be readily apparent
tor 68 so that the wheel spindle I6 is locked
from the foregoing disclosure that when the»
against a reciprocatory movement. When it is
control lever 52 is rocked in a counterclockwise
desired to manually position the wheel spindle I6, ‘
direction that is into stop position 52b, the cam 55 that is, to move the grinding wheel I‘I axially
82 will engage the plunger 83 and may shift the
into grinding relation with a shoulder'on the
yoked member 26 until the boss 86 engages the
work piece, the control lever 52 is moved from
stop screw 88 thus positively limiting the move
the intermediate position with the ball 55 into
ment of the yoked member 26 for shoulder grind
engagement with the notch 51, in a counterclock
ing.
eo wise direction, as desired. If it is desired to pos
7 The valve member 8| is provided with an in
itively lock the wheel spindle I6, in an extreme
take chamber 9| and an exhaust chamber 94.
left hand position the movement of the control
Fluid under pressure is supplied from a suitable
lever 52 is continued until the ball 55 engages
source through a pipe 98. When the control
the notch 58 .which positively moves the wheel
lever 52 is in a start or a spindle reciprocating 65 spindle I6 endwise until the boss 86 of the yoked
position, the valve chambers are positioned as
member 26 engages the stop screw 88 thus posi
indicated in Figs. 3.10 and ‘11 so that ?uid from
tively locking the wheel spindle I6 in a ?xed po
the pipe 98 willpass through the chamber 9|
sition when desired.
and out through a pipe 92 to the ?uid motor 68
In case it is desired to provide a mechanism for
above described. In this position of the valve 70 reciprocating the wheel spindle or stopping the
member 8|, ?uid will be passed to the ?uid motor
spindle and holding it against axial movement it
68 continuously to reciprocate the piston 36 and
is not necessary to provide the locking mecha
thereby to impart a continuous reciprocatory mo
nism above described. In such arrangement the
rock arm 48 may be ?xedly mounted on the rock
from the ?uid'motor 68 passes through the pipe -75 shaft 33 so that ‘the rock arm 32 is ?xed with
tion ofthe wheel spindle I6. The exhaust ?uid
2,409,450
7
relation to the rock arm 40. With‘ this arrange
ment of the. parts, when the control lever 52
is moved to a start position the control valve 8!
will be positioned to start the ?uid motor 6!]
and thereby continuously to reciprocate the wheel
spindle l6 through the desired stroke as deter
mined by the position of the dogs 65 and 66 and
at .a speed determined by the setting of the stop
screw 53. When it is desired to stop reciproca
tion of the spindle, the control lever 52 is moved
ina counterclockwise direction into position 521).
This movement shifts the valve 8| to cut oif the
8
movable wheel slide, spindle bearings in said
slide, a rotatable axially reciprocable wheel spin
dle supported in said bearings, means including
a fluid motor to reciprocate said spindle, a con
trol valve therefor,’ means including a normally
operative locking device to connect said motor
with said spindle to reciprocate the spindle for
a plunge-cut grinding operation, a manually op
erable control lever to actuate said valve, and
means actuated by said lever when the lever is
shifted to close said valve to disconnect said mo
tor from said wheel spindle.
2. In a grinding machine having a transversely
movable wheel slide, spindle bearings in said
passage of ?uid under pressure to the motor 60
thereby-stopping the ?uid motor and also serves
through the cam 82 to move the spindle l6 ax 15 slide, a rotatable axially reciprocable wheel spin
dle supported in said bearings, means including
ially toward the left into a ?xed position for a
a ?uid motor to reciprocate said spindle, a control
grinding operation.
valve therefor, means including a normally op
Theoperation of the improved wheel spindle
erative locking device to connect said motor with
reciprocating mechanism will be readily apparent
from the foregoing disclosure. Assuming the dogs 20 said spindle to reciprocate the spindle for a
plunge-cut grinding operation, a manually oper
65 and 66 together with the'stop screw '68 have
able control lever to actuate said valve, and a
been previously adjusted, the grinding operation
cam actuated by said lever when the lever is
may be started. If it is desired to plunge-cut a
shifted to close said valve to disconnect said mo
work piece, the control lever 52 may be rocked in
a clockwise direction into the position illustrated 25 tor from said wheel spindle.
3. In a grinding machine having a transversely
in Fig. 1 so that the stop screw 53 engages the
movable wheel slide, spindle bearings in said slide,
stop surface 54 which serves to start the ?uid
a rotatable axially reciprocable wheel spindle
motor 60 and also to allow the released compres
supported in said bearings, means including a
sion' of the spring 45 to rock the rock arm 48
so'that the lug 43 engages the groove 44 in the 30 yoked arm to reciprocate said spindle, a ?uid
motor, a control valve therefor, a rock arm oscil
rock arm 34, thus rocking the rock arm 34 so
lated by said motor, means to connect said arm
that it will transmit 'reciprocatory motion from
with said yoked arm, and a manually operable
the ?uid motor 60 to the yoked member 26 con
control lever which is arranged simultaneously
tinuously to reciprocate the wheel spindle I5.
to
actuate said valve to start said motor and to
By adjustment of the stop screw 53, the posi
actuate said connecting means to start recipro
tion of the valve 8| may be varied so as to reg
cation of said spindle.
ulate the passage of ?uid to the motor 60 and
1i. In a grinding machine having a transversely
thereby to facilitate regulation of the speed of
movable
wheel slide, spindle bearings in said slide,
the'motor 60 and the speed of reciprocation of
40 a rotatable axially reciprocable wheel spindle
the spindle l6 and grinding wheel 11.
supported in said bearings, means including a
When it is desired to stop reciprocation of the
yoked
arm to reciprocate said spindle, a fluid
wheel spindle IS the control lever 52 may be
motor, a control valve therefor, a rock'arm os
moved to position 52a (Figs. 12 and 13) so that
cillated by said motor, means to connect said
spring pressed ball 55 engages notch 51 (Fig. 8)
arm with said yoked arm, and a manually oper
which movement serves to cut off ?uid pressure
able lever which is arranged simultaneously to ac
to the ?uid motor 60 and thus stops reciproca
tuate said valve to stop said motor and to dis
tion of the spindle l5 and to hold it against re
connect said connecting means so as to stop
ciprocation in case it is desired to true the grind~
reciprocation of said spindle.
ing wheel II. If it is desired to manually move
5. In a grinding machine having a transversely
50
the wheelspindle I6 axially within its bearings
movable wheel slide, spindle bearings in said slide,
to positionthe grinding wheel I‘! for a shoulder
a rotatable axially reciprocable wheel spindle
. grinding operation the control lever 52 may be
supported in said bearings, means including a
moved further in a counterclockwise direction.
?uid motor to reciprocate said spindle, a control
The spring pressed ball 55 rides out of the notch
valve therefor, means including a normally op
51 during this movement of the control lever 52
erative locking device to connect said motor with
and the lug 43 moves out of engagement with
said spindle, a manually operable control lever to
the groove 44. The cam 82 then engages and
actuate said valve, means actuated by said lever
moves the plunger 83 which in turn moves the
when the lever is shifted to close said valve to
spindle l6 axially within its bearings to position
the grinding wheel H as determined by the set 60 unlock said device and thereby disconnect the
motor from said spindle, and means actuated by
ting of the stop screw 88. At this position the
said lever to move said spindle axially within its
ball 55 engages the notch 58.
bearings
to position the spindle for a-shoulder
It will thus be seen that there has been pro
grinding operation when the ?uid motor is
vided by this invention apparatus in which the
various objects hereinabove set forth together
with many thoroughly practical advantages are
successfully achieved. As many possible embod
iments may be made of the above invention and
as many changes might be made in the embodi
ment above set forth, it is to be understood that
all matter hereinbefore set forth or shown in
the accompanying drawings is to be interpreted
as illustrative and not in alimiting sense.
stopped and said locking device is unlocked.
6. In a grinding machine having a transversely
movable wheel slide, spindle bearings in said slide,
a rotatable axially reciprocable wheel spindle
supported in said bearings, means including a
?uid motor to reciprocate said spindle, a-control
valve therefor, a manually operable control lever
to actuate said valve, means to adjust the normal
aperture of said valve tofacilitate adjustment of
the speed of reciprocation of said spindle, and
I claim:
1. In a grinding machine having a transversely 75 means actuated by said lever when the lever is
2,409,450
9
,
shifted to close said valve to move said spindle
axially within its bearings to position said spindle.
7. In a grinding machine having a transversely
movable wheel slide, spindle bearings in said slide,
a rotatable axially reciprocable wheel spindle
' supported in said bearings, means including a
10
said spindle axially within its bearing: to posi
tion said spindle when the ?uid motor is stopped.
10. In a grinding machine having a transverse
ly movable wheel slide, spindle bearings in said
slide, a rotatable axially reciprocable wheel spin
dle supported in said bearings, means including
?uid motor to reciprocate said spindle, a control
a yoked arm to reciprocate said spindle, a ?uid
valve therefor, means to vary the stroke of said
motor, a control valve therefor, a rock ‘arm oscil
motor so as to adjust the reciprocatory stroke of
by said motor, means to connect said arm
the spindle, a manually operable control lever to 10' lated
with said yoked arm, a manually operable lever
actuate said valve, and means actuated by said
to actuate said valve, means actuated by said lever
lever when the lever is shifted to close said valve
to operate said connecting means to disconnect
to move said spindle axially within its bearings to
said motor from said spindle, and means actué
position said spindle.
ated by said lever ‘to move said spindle axially
8. In a grinding machine having a transversely
within its bearings to position said spindle for a
movable wheel slide, spindle bearings in said slide,
shoulder grinding operation when the fluid motor
a rotatable axially reciprocable wheel spindle
is stopped and said connecting means is discon
supported in said bearings, means including a
nected.
‘
yoked arm to reciprocate said spindle, a ?uid
11. In a grinding machine having a transverse
motor, a control valve therefor, a rock arm oscil
ly movable wheel slide, spindle bearings in said
lated by said motor, said rock arm being con
slide, a rotatable axially reciprocable wheel spin
nected to oscillate said yoked arm, a manually
dle supported in said bearings, means including
operable lever to actuate said valve, and means
a yoked arm to reciprocate said spindle, a ?uid
actuated by said lever to move said spindle ax
ially within its bearings to position said spindle
when the ?uid motor is stopped.
9. In a grinding machine having a transversely
movable wheel slide, spindle bearings in said slide,
a rotatable axially reciprocable wheel spindle
supported in said bearings, means including a
yoked arm to reciprocate said spindle, a fluid mo
tor, a control valve therefor, a rock arm oscil
lated by said motor,.said rock arm being con
nected to oscillate said yoked arm, a manually
operable lever to actuate said valve, and means
" including a cam actuated by said lever to move
motor, a control valve therefor, a rock arm oscil
lated by said motor, means to connect said arm
with said yoked arm, a manually operable lever
to actuate said valve, a cam actuated by said lever
to operate said connecting means to disconnect
said motor from said spindle, and means includ
30 ing a second cam actuated by said lever to move
saidispindle axially within its bearings to position
said spindle for a shoulder grinding operation
when the fluid motor is stopped and said connect
ing means is disconnected.
HERBERT A. SILVEN.
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