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Патент USA US2113363

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April 5, 1938.
C, H, AMlDON
GRINDING MACHINE
Filed Feb. e, _19:57
~
2,113,363
Patented Apr. 5, 1938
2,113,3635#
UNITED STATES rATENr OFFICE A
2,113,363
GRINDING MACHINE
Charles H. Amidon, Worcester, Mass., assignorgto
Norton Company, Worcester, Mass., a rcorpora
tion of Massachusetts
Application February 6, 1937, Serial No. 124,450
5 Claims. (Cl. 51-95)
This invention relates to grindingmachines, grinding Wheel I6 . is rotatably supported onta:
and more particularly to a hydraulically operated transversely movable wheel slide I1, of the vusual
cylindrical grinding machine.
,
One object of the invention is to provide a
5 simple, thoroughly practical hydraulically oper
ated grinding machine. Another object of the
invention is to provide an improved control mech-`
anism for a hydraulically operated grinding ma
chine. Another object of the invention is to pro
10 vide a hydraulically operated grinding machine
with an interlocked fluid pressure and lmanual
traverse control for the work table. Anotherob
ject of the invention is to provide a hydraulically
operated grinding machine with an interlock be
15 tween the control for the fluid pressure recipro
cating mechanism and the manual traversing
mechanism. Another object of the invention is
to provide> a fluid pressure reciprocating mecha
nism'for the work support which is controlled by
20 a manually operable lever and arranged so that>
when the lever is thrown tol an operativerposition,
the manual table traversing mechanism will be
rendered inoperative. Other objects will be in
part obvious or in part pointed out hereinafter.
The invention accordingly consists in the fea
25
tures of construction, combinations of elements,
and arrangements of parts, as will be exemplified"
in the structure to be hereinafter described, andv
the scope ofthe applicationof which will be in’- '
30 dicated in the following claims.
shown one of various possible embodiments-of
the mechanical features of this invention, '
Fig. 1 is a iront elevation of the' improved
'
Fig. 2 is a fragmentary front view, on an en
larged scale, of the manual and hydraulic? table
traverse controls, having parts broken away to
show the interior construction;
40
electric motor 20 is mounted on the wheel slidel
I1 and is provided with a pulley 2| which is con-4
nected by drivingbelts 22 with a pulley 23 on-the
end of a‘wheel spindle 24.
f
,
.,
,
A fluid pressure mechanism is provided tonre->l mf
ciprocate the table II. In the form illustrated; a
cylinder 30 is lixedly mounted to the underside
of the table I I. The cylinder~=3|l containsia piston
3| which is connected >by apair of hollow-.piston
rods 32jand 33, respectively, with a »pair Aci? hollow 1;-,Y
brackets`34~and 35,y respectively, »which are fixed?1
on opposite ends of the base I0.
.
-
In the preferred construction, the base I llîls~
formed as Y al hollow,
box-like yconstruction
in i
which the lower portion of the base serves' as a?
reservoir 40 for the fluid pressure system. Fluid ' 20
is drawn from--the-reservoir l40~through a pipe 4|
by a pump 42 and is forced through a pipe 43 and;
a pipe 44 -to a table-control valve 45.` A fluidA
pressure relief valve 46 is provided in thev pipe ’43
andv ls arranged to allow Ifluid under pressure to x
pass through a -pipe'4'l and returnïto‘the reser- -
voir 40in'case the ?luidpressure within the sys
tem increases above a desired pressure.-
The control valve`45'has 4been illustratedonly 30_
In the accompanying drawing, in whichff is »
35 grinding machine;
type, -such as for example'that shown in the ‘ex-y -
plredUnited States patent to Norton No. 762,838l
dated June 14, k1904. In the preferred form; an' 5,;¿
Fig. 3 is a cross sectional'view, on an enlarged '
diagrammatically», since'this featureis lnot con
sidered to be part of the present invention; For
a detailed disclosure of the control valve 45 andl
also theñuid pressure system, reference may be
had tothe United States Patent No. 2,071,677 to 35.>
Wallace H. Wood dated February 23, 1937. The
reversing valve 45 is arranged to combine the
functions of a reversing valve and Va pilot valve,
so that a lever actuated by thetableçmovement
serves to move the valve only to a center positionî 40 .
scale, taken approximately on'the line 3-3 ofv and then fluid under pressure serves to move the
Fig. 1; and
reverse valve into a reverse position, producing a
Fig. 4 is a fragmentary diagrammatic 'pip-ing smooth reversal of the table without the necessity ' .
arrangement of the ñuid pressure table recipro
of >providing a complicated series of valve mecha#
‘ nisms and pipe connections: A pivotally mount- 45
45 cating mechanism.
A grinding machine embodying this invention ed control lever 50 is carried by’a stud 5I mountcomprises a base IíJ=which supports a longitudi
nally movable table II on the usual V way- (not
shown) and a ii'at way 9 for a` longitudinal recip
50 rocating movement relative to the base I0. A mo
tor driven headstock I2 and a» footstock I3 are~
mounted on the table II and are arranged »ro~»
tatably to support a work piece on a headsto-ck
center I4 and a footstockcenter I5 in operative
55 Vrelation with arotatable grinding wheel 1G. The
ed on an apron 52 which lis‘ supported on~ the
front of the machine baseV I 0. The lower arm of
the lever 551s connected by a stud53 with> afvalve
stem 54 ofthe valve 45. The upper end of-the 50
lever 50 is arranged in the path of a pair oi.’ ad
justable table dogs 55 and 56.
Fluid under pressure may pass from the con
trol valve 45, through a pipe 60 anda pipe 6I,->
through the bracket 35 and the hollow piston» rod- 55 ~
2
2,113,363
33 and into a cylinder chamber 62 to move the
cylinder 30 an-d the table || toward the right
(Fig. 4) .
During the movement of the table
toward the right, fluid exhausts from a cylinder
chamber 63, through the hollow piston rod 32, a
pipe 64, a pipe 65, into a chamber 66 in the con
trol valve 45, and out through a pipe 61, through
the gears 89 and 92 and the shaft 88. The pinion
92 meshing with the fixed internal gear 93 is
thereby forced to rotate, turning the gear 89
with it, which in turn rotates the internal gear
90 and causes a differential movement between 5
the parts, this movement being transmitted to
the gears 9| and 85 to rotate the shaft 82 at a
a throttle port 68 in a control valve 69, and ex
hausts through a pipe 10 into the reservoir 40. A
10 valve piston 1| in the control valve 68 has an
slow speed, which motion is transmitted through
the gear 8| to the rack 80. Full details of this
ulate the aperture of the port 68 so as toV control
the speed of movement of the table ||. A valve
is not considered part of the present invention.
For complete details of construction of the manu
stem 12 of the valve 69 is provided with a con
ally operable table traverse mechanism, reference
trol knob 13 by which the valve may be rotated
to control the table speed. The valve- stem 12 is
arranged so that the valve may be moved end
wise from a stop to a start position by means of
Patent No. 1,299,765.
mechanism have not been illustrated or described
angled-off end face which may be rotated to reg- f in the present case, since this feature in itself
a control lever 15 which is pivotally mounted on
20 a stud 16. The lever 15 is connected to the valve
stem 12 so that the valve stem 12 may be moved
endwise to open or close the port 68 to. stop or
start the fluid pressure movement of the table
||. When the control valve 69 is moved toward
25 the left (Fig. 4) to stop the fluid pressure move
ment of the table, a by-pass groove 18 in the
valve 69 connects the pipe 65 with ther pipe 6| to
permit by-passing of fluid between the cylinder
_chambers 62 and 63 to facilitate manual travers
30 ing of the table when desired.
A manually operable table traverse mechanism
is provided for manually traversing the table ||
may be had to the above-mentioned United States 15
It is desirable to provide a suitable intercon
nection between the hydraulically operated table
reciprocating mechanism and the manually op
erable traverse mechanism so that when the table
|| ls reciprocated by means of the table control
fluid pressure mechanism, the manually oper
able traverse mechanism will be rendered inoper
ative so that the manually operable traverse wheel
86 remains stationary during the power recipro 25
cation of the table | I. This is preferably accom
plished by slidably keying the gear 8| on the shaft
82 so that it rotates therewith but may be moved
endwise into and out of mesh with the rack bar
80. A spring |00 surrounds the shaft 82 and ls 30
interposed between the gear 48| and a flange |0|
on the shaft 82. The compression spring |00
normally holds the gear 8| in mesh with the rack
longitudinally relative to the base I0. This mech
anism, as illustrated, is preferably of a two-speed 80. A head |02 on the end of the shaft 82 serves
type, such as that disclosed in the prior United to locate the gear 8| relative to the rack 88 and
States Patent No. 1,299,765 to Norton and Turner to limit its motion when thrown into mesh there
dated April 8, 1919.
The table || is provided
with.
‘
with a depending rack bar 80 which meshes with
In order to throw the gear 8| out of mesh with
a gear 8| slidably> keyed to a rotatable shaft 82. the rack 80 when desired, a bell crank lever |05
40 The shaft 82 is supported in bearings 83 and 84 is pivotally mounted on a stud |06 within the base 40
in the apron 52. A large gear 85 is keyed to the ’ |0 of the machine. The upper end of an arm |01
outer end of the shaft 82. A manually operable of the bell crank lever |05 is formed as a yoked
hand traverse wheel 86 is rotatably mounted on member |08 which straddles a hub on the gear
an outwardly extending shaft 81 which is fixed 8|. The yoked member |08 is provided with di
ametrically opposed, inwardly projecting pins 45
45 to the apron 52. The hand wheel 86 carries a
|09 which ride in a groove ||0 in the hub of
rotatable shaft 88 having formed integrally there
50
55
60
65
on a gear 89 which meshes with an internal gear
90. The gear 90 is mounted on the hub of a
the-gear 8|. It will be readily appreciated that
gear 9| which is rotatably mounted on the shaft
81. The shaft >88 rotatably supports a gear 92
meshing with a non-rotatable internal gear 93
which is fixed relative to the apron 52. When the
hand wheel 86 is rotated to traverse the table ||,
this motion is transmitted through the gear 89
to rotate the gear 90 at the same speed at which
the hand wheel 86 is rotated to transmit a rotary
motion through the gear 9| and through the gear
85 to rotate the shaft 82 and the gear 8| to cause
a longitudinal traversing movement of the table
||.
The outer face of the .gear 92 is provided with
clutch teeth (not shown) which are arranged to
be engaged by a clutch member 94 which is actu
ated by a knob 95. The clutch member 94 is
slidably keyed to the shaft 88 and is arranged to
be moved into and out of operative engagement
wise direction (Fig. 3), gear 8| will be moved
against the compression of the spring |00 into
dottedline position 8|a, out of mesh with the
rack bar 80.
when the bell crank lever |05 is rocked in a clock
In order to disengage the gear 8| when the con
trol lever 15 is thrown into the position illus
trated in Fig. 4 to start the table traverse under 55
ñuid pressure, a cam mechanism is provided
which is actuated by the control lever 15. A lever
|20 (Fig. 3) is mounted on the stud 16 and is
either formed integral with or fixed to the lever
15 so that when the lever 15 is shifted, the lever 60
|20 will be moved through acorresponding extent.
A cam |2| is formed on the upper end of a lever
|22 which is pivotally mounted on a stud |23
carried by the base |0. 'I'he cam |2| is arranged
to engage a follower roller |24 carried on an armi 65
|25 of the beu crank |05. The lower end of the'
with the clutch teeth on gear 92 by means of the
knob 95. If a slow traversing movement of the
table is desired, such as for traversing a diamond
70 or truing tool at a slow uniform rate across the
lever |22 is connected by a stud |26 with one end
of a link |21. The other end of the link |21 is
connected by a stud |28 with the lower end of
the lever |20. When the lever 15 is moved in a 70
fac'e of the grinding wheel I6, the knob 95 is
pushed toward the left (Fig. 3) so that the clutch
member 94 is thrown into engagement with the
clutch teeth on the gear 92. In this position of
75 lthe parts, rotation of the hand wheel 86 revolves
under control of the iiuid pressure mechanism,
the lever |20 is also rocked in a clockwise direc
clockwise direction (Fig. 2) to open the control
valve 69 and start the movement of the table
tion, causing the link |21 to move toward the left 75
2,113,363
3
(Fig. 3), thereby rocking the lever |22 on its
supporting stud |23 in a clockwise direction. This
that all matter hereinbefore set forth or shown
inthe accompanying drawing is to be inter
movement causes the cam |2| to move in a clock
preted as illustrative and not in a limiting sense.
wise direction, which in turn transmits a clock
wise'rocking movement ofthe bell crank |05 to
throw the gear 8| out of mesh with the rack 80,
thereby rendering the manually operable hand
wheel 86 inoperative and allowing it to remain
stationary during the fluid pressure traversing or
reciprocating movement of the table ||.
I claim:-
-
1. In a grinding machine, a longitudinally 5
movable table, a hydraulically operated recipro
cating mechanism therefor, a stop and start
valve Vto 'control the hydraulic mechanism, a
manually operable control lever to actuate said
valve, a- manually operable table traverse mecha 10
The cam |2| is so shaped that when the lever
|22 is I'noved in a clockwise direction (Fig. 3), the
nism including a rotatable hand wheel and a rack
rise on the cam causes the bell crank lever |05
to move into and out of mesh with said rack,
yieldable means normally to maintain said gear
in mesh with said rack, means including a pivot 15
ally mounted cam operatively connected to move
to be rapidly moved in a clockwise direction,
thereby quickly disengaging the gear 8| from
the rack 80.
The cam |2| is provided with a
portion which is concentric with the stud |23
which serves to lock the bell crank' |05 against
the compression of the spring |00 so as to hold
the gear 8| out of mesh with the rack 80 until
the control lever 'l5 is again shifted to stop the
fluid pressure reciprocating movement of the
table ||.
The grinding wheel slide |'| and grinding wheel
I6 are arranged for a transverse feeding move
ment to feed the wheel toward or from the work
piece being ground to produce the desired feed
ing action. A manually operable feed wheel |20
is mounted on the front of the machine base and
is operatively connected through a gear mecha
`nism and nut and screw mechanism (not shown)
to feed the grinding wheel transversely as desired.
The details of this mechanism have not been fully
illustrated in the present application since this
feeding mechanism is not considered a part of
the present invention. 'I‘his feed is substantially
identical to that shown in the prior United States
patent to Norton No. 762,838 dated June 14, 1904.
to which reference may be had for further de
40 tails of construction. The feed wheel |20 may be
operated manually or, if desired, it may be actu
ated by means of a feed pawl |2I.
The operation of this mechanism will be read
ily apparent from the foregoing disclosure. When
' it is desired to traverse the table manually, the
control lever 'l5 is positioned as illustrated in Fig.
3, so that the gear 8| is in mesh with the rack
'|0. In this position of the parts, the hand wheel
86 may be rotated and through the two-speed
mechanism above described, the table || may
be traversed either at a comparatively slow rate
or at a fast rate, as desired.
When it is desired
to traverse or reciprocate the table || by the
fluid pressure mechanism, the control lever 15
is rocked in a clockwise direction from the posi
tion illustrated in Fig. 3 into the position illus
trated diagrammatically in Fig. 4, which serves
to open the port 68, thereby starting the table
reciprocation by il'uid under pressure. During
60 the shifting movement of the control lever 15,
the cam |2| rocking in a clockwise direction
rocks the bell crank lever |05 also in a clock
wise direction to disenga-ge the gear 8| from the
rack 80, thereby rendering the manually operable
traverse mechanism inoperative and allowing the
hand wheel to remain stationary during the
and gear mechanism, s_aid gear being arranged
said gear out of mesh with said rack, and con
nections between said lever and cam whereby the
cam is moved to disengage said gear when the
lever is moved to start the hydraulic table trav 20
ersing mechanism, said cam being arranged t0
lock said gear out of engagement with said rack
during the hydraulic traversing movement.
2. In a grinding machine, a longitudinally
movable table, a hydraulically operated recipro 25
cating mechanism therefor, a stop and start valve
to control the hydraulic mechanism, a manually
operable control lever to actuate said valve, a
manually operable table traverse mechanism in
cluding a rotatable hand wheel and a rack and 30
gear mechanism, said gear being slidably mount
ed so that it can be moved into or out of mesh
with said rack, a spring normally to maintain
said gear in mesh with said rack, a pivotally
mounted bell crank lever, a yoke formed on one 35
arm of said bell crank lever which is operatively
connected to move said gear, a follower roller on
the other arm of said bell crank lever, a pivot
ally mounted cam, and a link connecting said
cam with said control lever whereby said cam 40
rocks said bell crank lever to throw the gear out
of mesh with the rack when the control lever is
moved to start the hydraulic table traversing
movement, said cam being arranged to lock said
gear out of mesh with the rack during the hy 45
draulic traversing movement.
3. In a grinding machine, a longitudinally
movable table, a hydraulically operated recipro
cating mechanism therefor, a stop and start
valve to control the hydraulic mechanism, a man
a manually operable table traverse mechanism
including a rotatable hand wheel and a rack
and gear mechanism, yieldable means normally
to maintain said gear in mesh with the rack, 55
means including a bell crank lever operatively
connected to move said gear out of mesh with the
rack, and means including a cam actuated by
said lever to move said bell crank lever to shift
the gear out of mesh with the rack when the 60
hydraulic table reciprocation is started, said cam
being so shaped and arranged as positively to
lock said 'gear out of mesh with the rack during
the hydraulic table traversing movement.
4. A grinding machine comprising a rotatable 65k
grinding wheel, a rotatable work support, a lon
power traverse of the table.
It will thus be seen that there has been pro
vided by this invention apparatus in which the
gitudinally movable table for said support, means
to move said grinding wheel and Work support
various objects hereinbefore set forth together
operable means including a rack and gear mech
with many thoroughly practical advantages are
successfully achieved. As many possible em
bodiments may be made of the above invention
and as many changes might be made ín the em
75 bodiment above set forth, it is to be understood
50
ually operable control lever to actuate said valve,
transversely relative to each other, manually
anism to traverse said table longitudinally, yield
70
able means normally to maintain said gear in
mesh with said rack, a fluid pressure system in
cluding a piston and cylinder operatively con
nected to reciprocate said table longitudinally, 75
4
2,113,363
means including a reversing valve to change the
direction of movement of the table, a control
valve which serves in one position to control the
speed of movement of the table and in a second
position to stop the flow of fluid to and from said
table and to permit by-passing fluid from one
end of the cylinder to the other, a manually op
erable lever to actuate said control Valve, and
a cam actuated by said lever to throw said gear
10 out of mesh with the rack when the control valve
is opened to start the table movement.
5. A grinding machine comprising a rotatable
grinding wheel, a rotatable Work support, a lon
gitudinally movable table for said support, means
15 to move said grinding Wheel and Work support
transversely relative to each other, manually op
erable means including a rack and gear mecha
nism to traverse said table longitudinally, a
spring normally to hold said gear in mesh with
said rack, a ñuid pressure system including a
piston and cylinderi operatively connected to
reciprocate the table longitudinally, means in
cluding a reversing valve to change the direction
of movement of the table, a control valve which
serves in one position to control the exhaust of
iiuid from said cylinder to regulate the power
movement of said table and in a second position
to shut off said ñuid flow and to permit a by-pass
of fluid from one end of the cylinder to the other 10
during a manual traverse of said table, a pivot
ally mounted bell crank lever operatively con
nected to move said gear against the tension of
said spring, a manually operable lever operatively
connected to actuate said valve, and a cam ac
tuated by said lever to rock said bell crank when
said control valve is moved to an open position
to throw said gear out of mesh with said rack.
CHARLES H. AMIDON.
15
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