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Патент USA US2118139

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May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
235'
6
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10 Sheets-Sheet 1
May 24, 1938.
2,118,139
s. w. BATH ET AL
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
l0 Sheets-Sheet 2
235'
‘ii
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May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
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l0 Sheets-Sheet 3
May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
10 Sheets-Sheef. 4
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May 24, 1938.
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MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
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May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
'10 Sheets-Sheet 6
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withdrew
May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
l0 Sheets-Sheet 7
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May 24, 1938.
s. w. BATH ET AL
' 2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
10 Sheets-Sheet 8
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May 24, 1938.
s. w. BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936'
10 Sheets-Sheet 9
May 24, 1938.
s. w.- BATH ET AL
2,118,139
MACHINE FOR GRINDING FLUTES
Filed June 1, 1936
10 Sheets-Sheet l0
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2,118,139
Patented May 24, 1938'
UNITED STATES
PATENT orncr:
2.118,139
MACHINE FOR GRINDING FLU'I'ES
Stanley W. Bath, Shrewsbury, and Ervin L. Ack
ley, Worcester, Mass” assig'nors to John‘ Bath
& Company, Worcester, Mann, a corporation of
Massachusetts
Application June 1, 1936, Serial No. 82,808
16 Claim. (CI. 51-92)
This invention relates to the manufacture of
taps for threading holes in metal, and relates
more particularly to the ?nishing of the longi
tudinal ?utes in such'taps or in other similar
5 articles.
It is customaryvto rough out these ?utes with
a milling cutter before the taps are hardened and
to ?nish the ?utes by grinding after the harden
ing operation.
10
Fig. 17 is a side elevation of the control mecha
nism, looking in the direction of the arrow I‘! in
Fig. 16;
Fig. 18 is a left-hand side elevation of the table
vide an improved machine for performing the
the arrow iii in Fig. 1;
Figs. 19 and 20 are front elevations of parts of
said mechanism, looking in the direction of the
arrows l9 and 20 respectively in Fig. 18;
Fig. 21 is a detail plan view, looking in the di- 15
In the preferred form, our improved machine
15 of our invention relate to novel devices by which
the operator may conveniently vary and control
the operation of the machine through manipula
tion and adjustment of the hydraulic mechanism.
Our invention further relates to arrangements
20 and combinations of parts which will be herein
after described and more particularly pointed out
in the appended claims.
'
A preferred form of the invention is shown in
the drawings, in which
25
Fig. l is a front elevation of our improved ?ute
grinding machine;
Fig. 2 is a partial right-hand elevation, looking
in the direction of the arrow 2 in Fig. 1;
Fig. 3 is an enlarged front elevation of certain
30 control mechanism;
Fig. 4 is a sectional plan view, taken along the
line 4-4 in Fig. 3;
Fig. 5 is a front elevation of a cam and cam‘
plate to be described;
35
Fig. 6 is a sectional plan view, taken along the
line 6-6 in Fig. 1;
Fig. 7 is a partial front elevation, looking in the
direction of the arrow 1 in Fig. 6;
Fig. 8 isv a detail side elevation, looking in the
40 direction of the arrow 8 in Fig. 6;
Fig. 9 is a plan view of certain parts,'par'tly in ,
section, and looking in the direction of the arrow
9 in Fig. 3;
-
Fig. 10 is a sectional front elevation, taken along
the line Iii-40in Fig. 9;
Fig. 11 is a right-hand side elevation of certain
parts, looking in the direction of the arrow II in
Fig. 9;
Fig. 12 is a left-hand detail side elevation, look
ing in the direction of the arrow l2 in Fig. 9;
Fig. 13 is a detail sectional view showing a speed
control valve and taken along the line l3-l3 in
Fig. 11;
55
Fig. 1;
elevating mechanism, looking in the direction of 10
is hydraulically actuated, and important features
50
Fig. 16 is a sectional front elevation of certain
‘valve control mechanism shown at the right in
It is the general object of our invention to pro
?ute-grinding operation.
45
showing the valve in successive di?erent posi
tions;
Figs. 14 and 15 are views similar to Fig. 13 but
rection of the arrow 2| in Fig. 19;
.
_ Fig. 22 is an end view, looking in the direction
of the arrow 22 in Fig. 21;
Fig. 23 is a sectional plan view of the work
spindle head, looking in the direction of the arrow 20
23 in Fig. 1;
Fig. 24 is a. sectional side elevation, taken along
the line 24-24 in Fig. 23;
'
Fig. 25 is a detail side elevation, looking in the 1
direction of the arrow 25 in Fig. 23; '
25
Fig. 26 is a'side elevation, partly in section, of
certain index valve mechanism, looking in the
direction of the arrow 26 in Figs. 1 and 27;
Fig. 27 is a sectional front elevation, partly
broken away and taken along the line 2l—2‘| in 30
Fig. 26;
"
Fig. 28 is a view similar to Fig. '27 but showing
certain parts in a different position;
,
Fig. 29 is a front elevation of the index valve
disc;
35
Fig: 30 is a side elevation thereof, looking in the
direction of the arrow 30 in Fig. 29;
_
'
a,
Fig. 31 is a diagrammatic view showing the‘
hydraulic connections; and
‘Figs. 32 to ‘35 inclusive show successive steps 40
in a flute-grinding operation.
Referring to Figs. 1 and 2, our improved ?ute
grinding machine comprises a frame 40 having a
wheel head 4! mounted in ?xed position thereon
and supporting a grinding wheel W on a wheel 45
spindle 42. The wheel spindle may be rotated
by any suitable driving mechanism, such as an
electric motor or belt and pulley connection (not
shown).
-
Vertical adjustment of work
50
A bracket 44 (Fig. 2) is siidable in guideways
46 on the front of the frame 40 and is movable
vertically by a screw 46 rotatable in ?xed bear
ings and threaded through a nut 41 ?xed on the 55
2
8,118,189
bracket 44. A bevel gear 49 is keyed to the screw
46'and is freely siidable thereon. The gear 48 is
supported on the bracket 44 and engages a bevel
A coil spring 85 is mounted on a reduced por
gear 49 (Fig. 20) on a shaft 59 extending laterally
to the side of the machine, where it is supported
in a bearing 9| (Fig. 19) on the bracket 44.
A gear 52 is keyed to the shaft 59 and meshes
tion 89 of the plunger" and pushes the plunger
provided with a crank arm 59 and handle '89.
A hand lever 48 is pivoted at 99 on the plunger
bearing and extends upward therefrom. The 10
tated.
By ~
As the screw is held in fixed vertical posi
_ ingly raised or lowered.‘
The handle 84 is used for major adjustments
of the work-supporting bracket 44, but for finer
adjustments, particularly during the grinding op
30
40
45
plunger portion 88 engages the rear end of the
plunger bearing.
tion, the nut 41 and bracket 44 will be correspond
25
to the right in Fig. 23 until the head center 8|
engages the work or until a collar 81 on the
with a smaller gear 83 mounted on a stud 54 and
10 turning the handle 98, the screw 48 may be ro
20
gitudinally of the table as indicated at 84 in
Fig. 24.
lower end of the lever 88 is forked as indicated at
99 (Fig. 24) and engages the inner face of the
collar 81 previously described. By pressing the
handle 88 to the right in Fig. 23, the head center
8| may be withdrawn to permit insertion or re 15
moval of the work. A dog or driver 92 (Figs. 23
eration, we provide an additional crank arm 1 . and 25) is mounted on an enlarged portion of the
(Figs. 18 and 19) which is loosely mounted on t e head center 8| and is notched as indicated at 93
to loosely receive the shank of a tap T.
outer end of the shaft 89.
The hub 88 of the crank arm 51 is_provided
Indexing mechanism
with an offset axially extending bearing 99 for
For the purpose of indexing the work, the head
a plunger 69 having a toothed plate 8| (Fig. 22)
secured to its outer end "and slidable between center 8| or the work spindle 82 is provided with
guiding projections 92 (Fig. 21) formed on the a pinion 88 (Fig. 23)/ meshing with a gear 99
mounted on a counter/shaft 91 rotatable in a fixed
offset bearing 59.
bearing in the work head 83. At its opposite end
A coil spring 93 (Fig. 19) is mounted in a pock
et in the crank arm and normally forces the the countershaft 91 is provided with a ratchet
plunger 89 to the right in Fig. 19, causing the wheel 88, the teeth of .which are engaged by a
teeth on the plate 9| to engage the teeth of the pawl 99 pivotaily mounted on an index lever I99,
which in turn is loosely pivoted on the outer end
gear 92 which is fast on the shaft".
'
The crank arm 91 is thus normally connected of the countershaft 91.
The feed lever I99 is provided with a stud I9I
direct to the gear 92 and shaft 99. Provision is
made, however, for disengaging the toothed plate (Fig. 24) extending through an elongated slot I92
8| from the gear 92 when it is desired to make a in the upper end of an actuating lever I93 pivoted
substantial adjustment in the position of the at I94 on the work spindle head 83.
A piston rod I95 and piston I96 are siidable in
bracket 44 by means of the crank handle 89.
an index cylinder I91, and the piston rod is con
For this purpose a bell crank 94 (Fig. ‘19) is piv
oted at 65 on a projection of the bearing 59, and nected by a slotted head I98 and cross-pin I99 to
is connected by a link 98 to a handle lever 91, the index lever I93, with the cross-pin extending
which is pivoted at 68 to the upper end of the through a second slot “9 in the index lever.
40
Pipes III and H2 connect the opposite ends
crank arm 91. By moving the handle portion 99
of the lever 91 downward, the bell crank 94 may of the cylinder I91 to an index valve mechanism
be caused to withdraw the plunger 99 against “4 (Fig. 1) ‘mounted on the front side-of the
the pressure of the spring 93, thus disengaging bracket 44 and connected by a pipe I I5 (Fig. 31)
the toothed plate 6| from the gear 92. As soon to a high pressure supply pipe II6 which in turn
as the handle portion 99 is released, however, the is connected to a pressure pump P.
A shut-off valve H1 is preferably provided in
plate and gear will be reengaged. The use of the
handle 69 during the grinding operation will be the pipe II! for a purpose to be described. The
valve mechanism “4 is also provided with an ex
hereinafter explained.
I
A bed 19 (Figs. 2 and 19) is siidable forward haust pipe II8 through which liquid may be dis
and rearward along guideways on the top surface charged to a reservoir 8.
The index valve mechanism I I4 is shown in de
of the bracket 44. An adjusting screw 1| is ro
tatable in a bearing 12 at the front of the bed 19 tail in Figs. 26 to 30 and comprises a casing~in
and is provided with a hand-wheel 13. The screw which is rotatably mounted a disc I29 having an
55 1| is threaded in a nut 14 on the bracket 44. For
ward and rearward manual adjustment of the
bed 19 is thus made easily available.
A work table 19 is slidable transversely of the
machine along guideways 19a and 15'’ (Fig. 2) on
60 the bed 19. The work table" (Fig. 31) is con
nected by a piston rod 18 to a piston 18it siidable
in a main hydraulic cylinder 11 shown in end view
in Fig. 2. Pipes 18 and 19 (Fig. 31) connect the
cylinder 11 to hydraulic supply and control mech
65
anism to be described.
_
‘
arcuate recess I2I in one face thereof and having
smaller recesses I22 and I23 in the same face but
provided with ports I24 and I25‘ extending
through the disc from opposite ends of the re
cesses I22 and I23.
.
The disc I29 is mounted on a short shaft I29
rotatable in a bearing I21 formed on the casing
of the valve mechanism. The shaft I29 is pro
vided at its outer end with an arm I28 (Fig. 1)
extending upward into the path of index dogs I29
and I39 adjustably secured in a T-slot I3| in the
front of the sliding table 15.
I
The exhaust pipe II9 (Fig. 27) is connected to
a port I32 which communicates with the arcuate
The tap T to be ground is mounted on the ' recess |2| in all working positions of the disc I29.
70 sliding work table 15 between a fixed tail center The pipes I II and H2 are also provided with ports 70
89 (Fig. 32) and a head center 8|. The head cen
I33 and I34 respectively and the supply pipe H5
ter 9| (Fig. 23) is mounted in the end of a work is connected to a recess I35 (Fig. 26) behind the
spindle 82 siidable and rotatable in a bearing in disc I29 and in constant communication with the
the work spindle head 93 which is mounted on ports I24 and I25.
When the index valve disc I29 is in the position 75
76 the sliding table 15 and which is adjustable lon
Work spindle head
2,118,189
shown in Fig. 27, the supply pipe II 5 'is connected
through the vport I25, recess I23 and the port I34
to the index cylinder pipe II2, thus giving the in
dexing mechanism an operating or feeding move
ment.
At the same time, the pipe I II from the op
posite end of the cylinder is connected through
the port I33, arcuate recess I2I and port I32 to
the exhaust pipe II8. At this time the port I24
10 and recess I22 are out of alignment with the
port I33.
3
any desired position and directly controls the
rate of travel of the sliding table.
The reversing valve cylinder I40 (Figs. 9 and
31) is provided with end ports I60 and I6I com
municating with cross passages I62 and I63. The
cross passage I62 is connected by a branch pipe
I64 (Fig. 31) to a pressure supply pipe I65 which
in turn communicates with the pressure pipe I49
previously described.
As substantially higher pressure is required for 10
operation of the index mechanism, it is custom
ary to provide a reducing valve I66 between the
When the valve disc I20 is shifted to the posi
tion shown in Fig. 28, the supply pipe is con
pipes H6 and I49 and a low pressure relief valve
nected through the port I24, recess I22 and port ~ I61 in a branch pipe I68 connecting the pipe I49
15 I33 to the pipe III, which thus supplies oil under to the reservoir S. With this arrangement, sub 15
pressure at the right-hand end of the index cylin
stantially lower pressure is provided in the pres
der I0'I (as viewed in Fig.24) and gives the feed
sure supply pipes I49, I65, and I64.
ing mechanism an idle return stroke; At the
The cross passage I62 (Fig. 31) is also con
same time, the pipe H2 is connected through the nected by a pipe I10 to a casing I‘II containing
20 port I34 and arcuate recess I2I to the port I32 a poppet valve I12 under the control of a dog
and exhaust pipe II 8, while the supply port I25 I13 on the sliding table 15 (Figs. 6 and '7) through
and recess I23 are out of operative position.
connections to be described. The casing I ‘II is
The arm I28 is engaged by the dog I30 and also provided with a port "4 (Fig. 31) connected
shifted from the right-hand position shown in to an exhaust pipe I15 communicating with the
25 Fig. 1 to the left-hand position indicated by the reservoir S.
broken line as the table 15 is moved to the left to
withdraw the work from the wheel. At the right
hand limit of table travel, when the wheel is in
the ?ute, the arm I28 is engaged by the dog I29
30 and is returned to the position indicated in Fig. 1,
thus giving the indexing mechanism an idle re-*
turn stroke without indexing action.
On each engagement of the arm I28 by the dog
I30, the piston I06 will move to the right in Fig.
24, and the pawl 99 will engage the teeth of the,
ratchet wheel 98 and give the countershaft 91
a partial revolution which is communicated‘
through the gear 96 and pinion 95 to' the work
The cross passage I63 at the opposite end or the
reversing valve cylinder is connected through a
pipe I'I6 (Fig. 31) to a second poppet valve casing
I'I'I having a valve I18 under the control of a
second dog I'I9 on the sliding table ‘I5. A port
I80 in the casing I" is connected by a'branch
pipe I8I to the exhaust pipe previously described.
When the machine is in operation, both ends of
the piston I4I are exposed to equal pressures. ex
.cept as one or the other poppet valves is opened
to partially relieve the pressure.
Poppet valve control mechanism
spindle 82, thus indexing and advancing the work
The cross passage I63 in the left-hand end
angularly.
_ of the cylinder I40 is also connected through a 40
If it is desired at any time to discontinue the passage I 83 (Fig. 31) and pipe I 84 to a chamber
indexing, the valve I" (Fig. 31) may be closed, I85 in a poppet valve control mechanism P. A
after which the arm I28 and valve disc I20 may
be shifted as previously described but no index
45 ing action will take place.
Reversing valve and speed control valve
The supply of liquid to the main cylinder ‘I1
is controlled by a reversing valve R (Fig. 31)
50 comprising a cylinder I40 having a ?oating piston
or bobbin I4I freely slidable therein.
The pipes ‘I8 and ‘I9 previously described con
nect ports I42 and I43 in the cylinder I 40 to the
opposite ends ‘of the main cylinder 'I‘I which actu
55 ates the sliding table. Exhaust ports I44 and I45
in the cylinder I40 are connected through an ex
haust pipe I46 to the reservoir S.
.An additional port M1 is connected through a
speed-control device D (Figs. 11 and 31) to a
60 branch supply pipe I49 which provides oil under
pressure. The speed-control device D is shown
in detail in Figs. 11 and 13 to 15, and comprises
a throttle valve plate I5I mounted on a short
shaft I52 rotatable in ?xed bearings I53 and I54
65 (Fig. 11) and having an arm I55 secured to the
front end of the shaft and provided with a handle
I56 (Fig.2).
_
By manually adjusting the handle I 66, the
70 throttle valve plate I5I will vary the ?ow of oil
from. the supply pipe I49 through the port I51
(Fig. 11) to the passage I58 which connects the
speed control device D to the port I41 in the re
versing valve mechanism R (Fig. 31) . The throt
75 tle valve plate I5I may be manually adjusted to
second chamber I86 in the mechanism P is con
nected ‘to the pressure supply pipe I65 and a third
chamber I8'I is connected by a pipe I88 to the
exhaust pipe "5.
The control mechanism P is mounted on an
arm I89 (Fig. 4) secured to the bed ‘I0 and com
prises a poppet valve I90 controlling communi
cation between the chambers I86 and I85 and a 60
second poppet valve I9I controlling communica
tion between the chambers I85 and I81.
The parts are shown in Fig. 31 in the position
assumed when the machine is at rest, with the
poppet valve I90 closed to cut off pressure oil from 55
the pipe I84 and cross passage I63, but with pres
sure oil supplied through the pipe I64, cross pas
sage I62 and port I60 to move the ?oating piston
or bobbin I4I to the left-hand position indicated
in Fig. 31. At the same time the left-hand end of 60
the cylinder I40 is connected through the pas~
sage I 83 and pipe I 84 to the exhaust pipe I98
through the open poppet valve I9I.
The detailed construction bf the mechanism P
is shown in Figs. 3, 4, 16, and 17.
Springs I92 and I93 (Fig. 16) are positioned
under the valves I 99 and I 9I and tend to close
said valves. The. stems of the valves I90 and
I9I extend upward through suitable glands and
are engaged at their upper ends by contact screws 70
I94 and I95 in opposite ends of a rock arm I96,
pivoted on a bracket I91 mounted on the. arm I89
as previously stated. The rock arm I96 is con
nected to an arm I98, which in turn is connected
through a link I99 (Fig. 3) to a rock arm 200
4
8,118,188
having a pin 20I extending into a "slot 282 in a
cam plate 203. The rock arm 200 is pivoted on
the bed 10 and the cam plate 203 is mounted on
a slide plate 205 (Fig. 4) vertically movable on a
dove-tailed guideway 208 secured to the face of
the bed 10.
Upward movement of the slide plate 206 by
mechanism to be described causes the cam plate
203 to move the rock arm 200 and shift the link
10 I99 in the direction of the arrow a in Fig. 3. This
in turn moves the arm I88 and rock arm I86 in
a direction to depress and open the poppet valve
I90 (Figs. .16 and 31) and to permit simultaneous
closing of the poppet valve I9I by its spring I93.
16
The valves I90 and I9I are then in a position
which is the reverse of that shown in Fig. 31, and
the pressure supply pipe I65 (Fig. 31) is then con
nected through the chambers I86 and I85 to the
pipe I84 and through the passage I83,v cross pas
sage I63 and port I6I to the left-hand end of the
cylinder I40 of the reversing valve mechanism R.
As the right-hand end .of the cylinder I40 is
always supplied with pressure 011. through the
pipe I 64, both ends of the cylinder are then under
equal pressure and the bobbin I“ will remain in
whatever position it happens to occupy until one
or the other of the poppet valves I12 or I18 are
opened to reduce the pressure in the associated
end of the cylinder I40.
,
If the piston MI is in the position shown in
Fig. 31 and the poppet valve I12 is open, the pres
sure pipe I64 will be connected through the pipe
I10, casing HI and port I 14 to the exhaust pipe
115, thus reducing the pressure in‘ the cross pas
sage I62 and in the right-hand end of the cyl
inder I40.
As full pressure is still maintained in the left
hand end of the cylinder, the piston .I4I will‘be
shifted to the right, connecting the port I41 to
the port I43 and thus admitting oil under pressure
through the pipe 19 to the left-hand end of the
main cylinder 11,.
plate 206 is moved upward. Such upward move
ment acts through the rock arm 200 and link
I 88 to shift the poppet valve control mechanism
P as previously described and place the machine
in condition for operation.
The upward movement of the slide plate 286
also lifts the lugs 2I6 and 2I6 into the path of
travel of the dogs I13 and I18. It is of course un
derstood that these dogs, as well as the dogs I29
and I30 previously described, are all conveniently 10
adjustable lengthwise of the sliding table 15 and
that they may be secured in adjusted position by
bolts 226 for the dogs I28 and I30 and by handle
nuts 226 for the dogs I13 and I19.
The dog I13 (Figs. 6 and 7) is pivoted at 221 16
to an adjustable support 228 and has a projection
229 engaging an abutment 230 on said support.
The dog I13 thus swings freely in a clockwise
direction but is rigidly held from movement in
the opposite direction. This permits a run-o? of
the table 16 to the left beyond the position deter
mined by the dog I13, when desired.
‘
The operative faces of the dogs I13 and I19
are also beveled or inclined to correspond to the
bevel of the lugs 2I6 and 2I8.
The sliding table 16 is preferably provided -25_
with‘ an upwardly extending wall 236 (Figs. 23
and 24) enclosing the head and tail stocks and
protecting the mechanism from grinding wheel
dust. A shelf 236 (Fig. 2) may be mounted on 30
the front side of the table ‘wall 235 for the con-'
venience of the operator. A supply pipe 231 (Fig. 31) extends from the reservoir S to the pump P.
Operation
have been described at considerable length in con
nection with the detail description of the parts,
but for convenience a comprehensive statement
of the cooperation of the several parts will now 40
be given.
The operation to be performed is indicated in
Figs. 32 to 35, in which a tap T is shown mounted
The piston “I will remain at the right-hand
end of the cylinder I40 until the poppet valve I18 ' between tail and head centers 80 and 8| and
is opened, whereupon the pressure in the left
positioned for engagement by a grinding wheel W.
hand end of the cylinder I40 will be reduced and
In Fig. 32 the parts are shown just after a fresh
the piston I H will return to the position shown tap has been inserted,the tap being loosely po
in Fig. 31, with oil under pressure supplied sitioned angularly by the dog 92. The tap is
through the ports I41 and I42 and pipe 18 to the then raised to the level of the wheel, as indicated
right-hand end of the main cylinder 11.
in Fig. 33, and the sliding table isimoved to the
The connections between the dogs I13 and I19 right, carrying the work under the wheel.
and the poppet valves I12 and I18 will now be
The table is then reciprocated, as indicated by
described.
the double arrow in Fig. 34, and the work is raised
very slightly during the grinding operation un
Manual and automatic control of table travel
til the desired polished surface is attained.
A reversing lever 2I0 (Figs. 6 and 7) is loosely
The work is then lowered and removed to the
mounted on a shaft 2I I, which in turn is sup
left, as indicated in Fig. 35, in which position the
ported in a bearing in the slide plate 205. A tap is indexed, after which the described opera
downward projection of the lever 2I0 terminates tions are repeated, this procedure being followed
in a ball-shaped end 2I2 positioned between the until all'?utes of the tap are ground.‘
heads of the poppet valves I12 and I18. The lever
Major adjustments of the work vertically are
2I0 also extends upwardly to provide a handle accomplished by use of the handle 56 (Figs. 18
2I3 and a rearward projection 2“ (Fig. 6) of and 19) after the toothed plate 6| has been with
the lever 2 I 0 supports oppositely disposed lugs 2 I5 drawn from engagement with the gear 52 by
and 2I6, having downwardly inclined outer faces rocking the handle 69. The raising and lower
positioned for engagement by the dogs I13 and ing of the work during the grinding’operation,
I19 respectively.
as described in connection with Figs. 32 to 35,
A handle 220 is connected to the front end of is accomplished by swinging the arm 51 (Figs.
the shaft 2“ and a lifting cam 22I (Figs. 3, 5,_ 18 and 19).
70 and 8) is secured to the rear end of the shaft 2I I.
The reciprocating motion of the table is under
The cam 22I cooperates with a cam opening in
the control of the manually operated handle 220
’ plate 206 fixed to the front of the bed 10.
(Fig. 4) and cam 22I (Figs. 3 and 5) by which
By swinging the handle 220 upward toward the plate 205 and reversing lever 2I0 are raised
vertical position, the cam 22I is moved in a clock
75 wise direction as indicated in Fig. 5 and the slide
35
Many features of the operation of the machine
45
I
50
56
60
70
or lowered.
When the plate 205 is raised, the cam slot 202 75
5
2,118,189‘
reverses the position of the rock arm I88 forming
part of the poppet valve control mechanism P,
which action opens the valve I00 and closes the
valve ISI' (Fig. 31). This supplies oil under pres
sure through the pipe I84 to the left-hand end
of the reversing valve cylinder “0, all as pre
viously described.
quire further attention unless a change in class
of work takes place.
>
.
Having thus described our invention and the
advantages thereof, we do not wish. to be limited
to the details herein disclosed, otherwise than as
set forth in the claims, but what we claim is:
l. In a grinding machine. a sliding table,
table-moving mechanism, a single control device
.
Oil under pressure is thus supplied at both ends
of the ?oating piston or bobbin “I and the
for said mechanism, table-reversing means, and ,
manual means to move said device toward and 10
10 piston Ml moves toward one end or the other
of the cylinder as one or the other of the poppet
valves 112' and H8 is opened to relieve the pres
away from the path of table movement,_said de
vice when moved by said manual means toward
sure on the associated end of the cylinder H0.
said path placing said machine'in operation and
The lifting of the slide plate 205 not only said device when additionally moved by said man
15 brings the lugs 215 and 216 on the vreverse lever ual means in the same direction being effective to 15
2l0 into the path of movement of the dogs "3 change the range and extent of working travel
and H9, but by reason of the inclined surfaces of said table as de?ned by said reversing means
on the lugs and associated dogs, the length‘of . and during a grinding operation.
stroke of the sliding table 15 and the travel of the
2. In a grinding machine, a sliding table, dogs
work supported thereon is also controlled by the on said table, table-moving mechanism, a control 20
extent of lifting action.
_
and reverse lever for said mechanism which is
By swinging the handle 220 through a greater normally in lowered inoperative position, and
or less arc, the cam 22| will lift therslide plate
265 a greater or less distance and the dogs I10
and I19 will engage wider or narrower portions
manual means to move said lever vertically into
position for engagement by said dogs and by
further movement to vary and determine the 25
length of the working stroke of said table during
a grinding operation.
3. In a grinding machine, a sliding table, dogs
of the lugs M5 and 2H5 on the reverse lever M0.
The higher the reverse lever and lugs are po
sitioned, the longer will be the travel of the table
in both directions. This manual control of table
travel is of particular advantage in a machine
for grinding ?utes, as the ?utes in different taps
vary slightly in length and it is desired to grind
each ?ute far enough to provide a bright surface
but not far enough to force the wheel into solid
metal. By operating the lever 220 with one hand
‘and the lever 51 with the other hand, the operator
can easily control both the depth and length of
the cut, so that an effective grinding operation
on said table, table-moving mechanism, a con
trol and reverse device for said mechanism, a 30
support on which said control and reversing de
vice is movably mounted, ‘said support being ‘
normally in lowered inoperative‘ position, and
manual means to raise said support and to there
by move said device into the path of travel of said
dogs.
4. In a grinding machine, a sliding table, dogs
on said table, hydraulic table-moving mecha
is quickly performed.
nism, a control and reverse device for said mecha
nism, a support for said device, means to lower
said support so that said device will clear the
dogs, and table-stopping means controlled by said .
When the slide plate 205 is lowered at the end
of the grinding operation, the poppet valve con;
trol mechanism P is returned to initial position
and shifts the valves I90 and I9! to the position
shown in Fig. 31 with the pipe I 84 connected to
the exhaust.
lowering movement.
5. In a grinding machine, a sliding table, a
pair of associated reversing dogs on said table, 45
table-moving mechanism, a control and reverse
device for said mechanism normally out of posi
The ?oating piston “I will be immediately
shifted to the left in Fig. 31, connecting the pipe
18 to the pressure supply and moving the table
15 to the left until further travel is prevented by
tion to engage either of said dogs, means to move
said device into position for alternate engage
ment by both of said dogs, and automatic means 50
to immediately move said table to reloading po
sition, and stop said table in such position when
a stop collar 240 on the piston rod ‘I6.
Near the end of this left-hand travel, the dog
I30 engages the arm I28 of the index mechanism,
shifting the position of the valve disc I20 (Figs.
ever said device is moved out of operative rela
27 to 30) and’ effecting the indexing of the work.
tion to both of said dogs and regardless of the
As the table 15 completes its left-hand travel,
an abutment 22811L (Fig. 7) engages the rearward
projection 2“ on the reverse lever 2 l0 and swings
the lever anti-clockwise to open the poppet valve
I12 (Fig. 31). This relieves the pressure on the
right-hand end of the piston I“, so that the
direction of travel of the ‘table when said device 65
piston will move immediately to the right as soon
as the control mechanism P admits pressure oil
to the pipe I84.
When the slide plate 205 and reverse lever 2“)
65 are lifted to effect resumption of grinding opera
tions, the lugs 215 and H6 will be at the right of
the dog I13, but the dog will yield 'to permit pas
sage of the lugs as the table moves to the right,
which movement is immediately initiated as above
described.
As previously stated, the rate of travel of the
table 15 may be manually controlled by the speed
control valve l5l shown in Figs. 13 to 15, and
this valve when once set commonly does not re
is so moved.
‘
6. In a grinding machine, a sliding table, dogs
on said table, hydraulic table-moving mecha
nism, a control and reverse device for said
mechanism, a support for said device, means to
lower said support so that said device. will clear
the dogs, a valve device effective to cause the
table to move to reloading position, and a control
connection between said support and said valve
device.
‘
65
7. In a grinding machine, a sliding table, dogs
on said table, hydraulic‘ table-moving mecha
nism, a. control and reverse device for said
mechanism, a support for said device, means to
lower said support so that said device will clear 70
the dogs, a valve device effective to cause the
table to move to reloading position, a control
connection between said support and said valve
device, and a cam on said support acting to shift
said control connection as said support is lowered.
(
6
2,118,189
8. In a grinding machine, a sliding table, dogs
on said table, hydraulic table-moving mecha
versing valve device to said pressure supply dur
nism,‘ a control and reverse device for said
means to connect the pressure connection at one
ing the time that the machine is in operation, and
end or the other of said reversing valve to the
and moved by said dogs, means effective to vary exhaust at each end of table travel and thereby . c.
partially reduce the pressure at the correspond
the extent of working travel of the table result
ant from alternate engagement of said device by ing end of said reversing valve andeffect re
said dogs while the portions of said dogs which versal thereof.
13. In a grinding 'machine, hydraulic tableengage said device maintain a fixed relation to
said table,‘ and means continuously under man ~moving mechanism, a reversing valve device 0
ual controleifectivetooperatesaid?rstmeans to therefor, a pressure supply continuously con
nected to both ends of said valve device while the
selectively vary the table travel while the ma
chine is performing a grinding operation on a machine is in operation, a relief valve for each
end of said cylinder, exhaust connections for said
piece of work.
.
relief valves, and means to open a selected relief
9.
In
a
grinding
machine,
a
sliding
table,
dogs
15
valve‘ at each end of the table travel to effect
on said table, table moving mechanism, a con
trol and reverse device for said mechanism, said reversal of said travel.
said device being alternately engaged
device being alternately engaged and 'moved by
14. In 'a grinding machine, hydraulic table
said dogs, and'm'anual means to shift said device
moving mechanism, a reversing valve ‘ device
bodily relative to said dogs and transversely of
their path of travel and to thereby vary‘ the
therefor, a- pressure supply continuously con so
nected to both ends of said valve device while
the machine is in operation, a relief valve for each
extent of working travel resultant from engage
_ ment of said device‘by said dogs.
10. In a grinding machine, a sliding table, dogs
on said table, table-moving mechanism, a con
trol and reverse lever for said mechanism, and
means to shift said lever vertically, said dogs
having lever-engaging surfaces slanting downi
wardly toward each other, whereby the range of
table travel is determined by the vertical posi
tion of said lever.
_
11. In a grinding machine, a sliding table, a
hydraulic table moving mechanism, a reversing
valve device therefor, -a pressure supply, and a
manually operated control mechanism effective to
expose both ends of said reversing valve device
to full pressure during the time that the machine
is in operation andalso effective to maintain
‘full pressure at one end of said valve device and
to simultaneously connect the other end of said
device to the exhaust to relieve the pressure
thereon at any point in the table travel and to
thereby effect movement of said valve device by
which said table is caused to move to predeter
mined initial position and to stop‘ in such posi
tion.
12. In a grinding machine, hydraulic table
moving mechanism, a reversing valve device
therefor, a pressure supply and a control mecha
50 nism effective to connect both ends of said re
end of said cylinder, exhaust connections for said
relief valves, means to open a selected relief valve
at each end of the table travel to effect reversal
of table travel, and means to, shift the connec
tion at onetend of said valve device from pressure
to exhaust when the machine is to be stopped and
to thereby cause the machine to be stopped in I
30
reloading position.
15. In a grinding machine, a frame, a work
vsupporting member, a lifting screw for said mem
ber, a cross shaft geared to said screw, a gear
?xed to said cross shaft, an arm loose on said
cross shaft, a handle on said arm, a driving ele 35
ment on said arm engaging said gear, and a
connection between said driving velement and said
handle whereby said driving element may be
moved to inoperative position by rocking said 40
handle on said arm. -
I
16. The combination in a grinding machine
as set forth in claim 15, in which a second gear
engages the gear on the cross shaft, and a second
arm and handle are connected to turn said sec
ond gear, said second arm and handle being avail
able for major vertical adjustments of said
member.
STANLEY W. BATH.
ERVIN L. ACKLEY.
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