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Патент USA US2130823

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Sept. 20, 1938.
J, c_ WILSON
2,130,823
GRINDING MACHINE
Filed May 25, 1937
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4 Sheets-Sheet 1
INVENTOR
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ATTORNEYS
Sept. 20, 1938.
J. 0. WILSON
2,130,823
GRINDING MACHINE
Filed May 25, 1937
4 Sheets-Sheet 3
(Ittornegs
Sept. 20, 1938;
2,130,823
J. C. WILSON
GRINDING MACHINE
Filed May 25, 1937
I15 5
42a’
38
4 Sheets-Sheet 4
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Cttorncgs
' Patented Sept. 20, 1938 ‘
2,130,823
UNITED STATES PATENT OFFIQE
4 2,130,823
GRINDING MACHINE
John C‘. Wilson, Spring?eld, Ohio, assignor to
The Safety Grinding Wheel & Machine Com
pany, Spring?eld, Ohio, a corporation of Ohio
Application May 25, 1937, Serial No. 144,668
3 Claims.
\ This invention relates to improvements in
grinding machines.
An object of the invention is to provide im
proved means for imparting a uniform and cor
5 rect peripheral speed to the grinding wheel as
the wheel wears.
A further and more speci?c object of the in
vention is to provide improved means for impart—
ing a uniform speed to the grinding wheel of a
10 character which will avoid the necessity of chang
ing the relation of the wheel spindle and the
motor shaft.
In the accompanying drawings:
(Cl. 51-166)
hand wheel 12 is located on the forward side of
the machine and is connected with a shaft l3
which has on its inner end a miter gear to (Fig.
3) meshing with a second miter gear 55 on one
end of a horizontal shaft It. The other end of 5
the shaft 56 is provided with a sprocket wheel H
which drives another sprocket wheel 58 through
the medium of a sprocket chain E 9. The sprocket
wheel 18 is ?xed on the intermediate portion of
a short shaft 20.
The shaft 2?) has near one end
thereof a spur gear pinion 2! (Fig. 4). The spur
gear 2! is meshed with a gear segment 22 fast to
Fig. 1 is an end view of a grinding machine
a shaft 23 to which is connected a crank arm 2%.
The crank arm 24- is pivotally connected to one
15 embodying the improvements.
Fig. 2 is a section on the line 2-2 of Fig. 1.
Fig. 3 is a fragmentary top plan view with some
of the parts shown in transverse section.
link 26. The rocker beam is pivotally carried by
Fig. 4 is an enlarged end elevation of some of
20 the parts shown in Fig. l but in a different work
ing position.
Fig. 5 is a View partly in section and partly in
end elevation of some of the parts shown in Fig. 1.
Fig. 6 is a section on the line 6-6 of Fig. 5.
25
Fig. 7 is an enlarged fragmentary section on
the line 7~—'l of Fig. 3.
Fig. 8 is an enlarged fragmentary section on
the line 8-8 of Fig. 3.
Referring to the drawings, I represents a sup
3.0 porting base which has bolted thereon a hood 2
for the grinding wheel 3, one side 2’ of the hood
being hinged so as to be swung laterally in a well
known way to permit installation of the grinding
wheel. The grinding wheel is removably mounted
35 upon one end of a spindle 4 which is journaled in
suitable bearings 5 on the upper side of the base.
The front of the hood 2 is provided with an open
end of a rocker beam 25 through the medium of a
a bracket 21 on the hood and the other end of
the rocker beam is connected to the rear portion
of the upper end of the guard 6. The guard E
has an car 28 formed with a slot 29 through which
extends a pin 30 which is fast to the rocker beam.
By this arrangement it will be seen that when the
hand wheel is turned in one direction the guard
6 may be adjusted toward the grinding wheel,
this adjustment being made at intervals as the
wheel wears. In Fig. 4 the guard 6 is shown in full
lines in the position it assumes for a new wheel
and in dot-dash lines in the position assumed
after the wheel has worn out.
Provision is made for varying the speed of the
wheel as it wears, the speed of the spindle of the
wheel being gradually increased as the wheel
Wears away, the guard 6 acting as a gauge to con
trol the increased speed of the spindle. In order
to avoid the necessity of changing the relation
of the motor shaft and the grinding wheel spin
dle to secure variable speed of the wheel spindle
ing to expose the grinding wheel and is equipped
I make use of sheaves which are capable of hav
in‘the usual way with a curved guard 6 which is
ing the effective radii of the belt contacts
changed, one set of these sheaves being located
4.0 slidably mounted in channel members ‘I secured
to the hood. This guard 6 is manually adjustable
toward the wheel by mechanism hereinafter de
on the motor shaft and another set on an inter
mediate or jack shaft, which in turn has a drive
Each
adjustment of the variable speed devices to pro
sheave of a set is formed of two companion mem—
45 vide uniform and correct peripheral speed for 'bers, a stationary member and a movable mem
the grinding wheel. A pair of bolts 8 are passed ber, having opposed tapered surfaces to form an
through the upper portions of the channel mem ' outwardly tapered groove.
ber l and the guard 6, with nuts 9 on the inner
The motor which drives the wheel spindle is
ends of the bolts, and the bolts have hand knobs indicated at 3! and its shaft at 32 (Fig. 6 only).
50 It] on their forward ends with springs ll inter
The jack shaft which is driven from the motor 50
posed between the hand knobs and the channel shaft 32 is indicated at 33. Referring first to the
members which bolts act to yieldably hold the sheaves which are mounted upon the motor
guard in its adjusted positions.
shaft (Figs. 5 and 6), 34 represents a hub which
The guard 6 is moved toward the grinding wheel is secured to the motor shaft by set screws one
55; as the wheel wears by the following devices: A of which, 35, is shown. Rotatably connected 55
scribed and acts as a gauge to determine the
ing connection with the wheel spindle.
2
2,130,823
with the hub 34 are a plurality of ?xed sheave
- members 36 which have tubular extensions 31.
These ?xed sheave members are fast to the hub
34 by a long key 38. Slidably mounted upon the
tubular extensions 31 are movable companion
sheave members 39, each one of which has a
plurality of lugs 49 which extend through open
lngs M in its companion ?xed sheave member
and abut against the next adjacent movable
sheave member and so on throughout the series
so as to hold the sheave members properly
The screws 46 and 46’ are operated simul
taneously, one to increase the effective radii for
the belt contacts on the motor shaft and the
other to decrease those radii on the jack shaft,
as the grinding wheel wears. To that end the 5
screw 46 has attached thereto a sprocket wheel
63 and the screw 46’ has ?xed thereto a sprocket
wheel E53’.
Passing about these sprocket wheels
is a sprocket chain 64 which also passes about
a sprocket wheel 65 fast to the shaft 20 which
The ?nal lug 40 at the right of the
has been previously described as being operated
by the hand wheel l2. This sprocket chain 64
sheave assembly abuts against a ?nal movable
sheave member 42 and all of the movable sheave
also passes about an idler and tension sprocket
wheel 65 and another idler sprocket Wheel 61.
spaced.
15 members are connected together by a plurality
of long screws 42a. The movable sheave mem
ber 42 has an extended hub 44 which is slidably
mounted in a bore $5 in one end of the hub 34.
The series of movable sheave members are moved
20 to and from their companion sheave members
by a screw 46 which is rotated by connections
which are operated when the guard 6 is ad
justed. This screw has thereon a nut Ill‘ which
is held from turning by a strap '58, which is fast
25 to an internally threaded collar 49 which is
screwed on the nut 437. The nut 1i‘? has fast
thereto an inner ball race 50 and the movable
sheave member 42 has fast thereto an outer
ball race 5i, ball bearings 52 being interposed
30 between the races; the extended hub M of the
member 42 having a shoulder as-shown against
which the race 5! bears. The inner end of the
screw has an enlarged head 53 and an enlarged
boss 54. An inner ball race 55 is ?xed to the
35 boss 54 and an outer ball race 56 is ?xed to the
bore of the hub 31% with ball bearings 5i inter
posed. As a result of this construction when
the screw is turned in either direction all the
movable sheave members will be simultaneously
40 moved to or from their companion stationary
sheave members to a like extent so as to in
crease or diminish the effective radii of the belt
contacts, the belts being indicated at 58 and
being of the V-type. In Fig. 6 the sheave mem
45 bers on the motor shaft are shown adjusted to
permit the belt contacts to be at the lowest
possible radii. When the motor shaft and the
sheave members rotate they will revolve about
the nut 67 and boss 54 of the screw, the ball
bearings being interposed to reduce friction.
On the jack shaft 33 is a similar arrangement
of sheave members and associated parts indi
cated by the same reference characters as the
mechanism on the motor shaft with the addi
55 tion of prime marks and which need not be de
scribed in detail with the exception to state that
the screw, indicated at 46’ is of opposite hand
from the screw 46 so that when the screw 136 is
adjusted to separate the companion sheave mem
60. bers to decrease the effective radii of the belt
contacts the companion sheave members on the
shaft 33 will be moved closer together to in
crease the effective radii of the belt contacts.
The nut 41’ on the screw 46’ is held from turn
65 ing by a strap 59 which is fastened to the nut
Each of the sprocket wheels 66 and 6'! is ro
tatably mounted upon opposite ends of a double
armed lever 68 which is pivotally and rockably
mounted upon the shaft 20 and a spring 69 fast
to one arm of this lever exerts a tension to draw
it downwardly to take up any slack in the
sprocket chain ?ll. As a result of this construc
tion when the hand wheel I2 is operated to move
the guard 6‘ toward the grinding wheel as it
wears it will act to adjust the movable sheave
members with relation to their stationary com 25
panion members to increase the effective radii
of the belt contacts of the sheave members on
the motor shaft and decrease the effective radii
of the belt contacts of the sheave members. on
the jack shaft to thereby increase the speed of 30
the grinding wheel spindle which is connected
with the jack shaft in the following manner:
The jack shaft has thereon a pulley ‘H! with a
series of grooves to receive a series of belts ‘II
which pass about a series of grooves in a .plain 35
pulley ‘F2 on the wheel spindle 4 (Figs. 3 and 4).
Provision is made for initially adjusting the
supports for the jack shaft and for the motor
shaft in order to bring the proper tension upon the
belts. The jack shaft is supported in bearings
73 in the casting ‘M which is slidably mounted
upon a central bar '75 and end bars 16 (Figs. 3 and
'7). The bar 15 has ?xed thereto a collar Tl which
has an exteriorly threaded extension 18. A nut
'59 is threaded on this extension and is adapted 45
to bear against the boss 8i? on casting ‘M whereby
the casting ‘M and the jack shaft may be adjust
ed in order to tighten the belts between the jack
shaft and the wheel spindle. The motor 3| is
hingeably supported at one point on the rod 60 50
and has pivoted to another point thereof as at 8|
an adjusting screw 82 (Figs. 1, 3 and 8), this ad
justing screw passing through the bifurcated ear
83 on the casting 14 which supports the jack
shaft.
A nut 84 is threaded on the screw 82
and bears against the hollow block 85 which is
loosely mounted on the screw and is rockably sup
ported on conical shaped pins 86 which are thread
ed in the members of the ear 83 on the casting ‘M.
There is threaded on the screw below the hollow 60
block another nut 81. In order to increase the
tension on the belts between the motor shaft and
the jack shaft the nut 84 is turned upwardly on
the screw so as to let the motor and its shaft
drop by gravity. After this adjustment is made 65
47’ in the same manner described in connection
with the device on the motor shaft.
the nut S‘! is turned up against the lower end of
the hollow block to prevent the motor and its
The free ends of each of the'straps 48 and
shaft from climbing in starting.
It will be understood that after a grinding
59 are forked and straddle a reduced portion of
70 a rod 6b which is ?xed to the base.
These forked ends of the straps are held on
the reduced portion of the rod by. a collar Bi and
a coil spring 62 is interposed between the straps
and the shoulder formed by a reduced portion
75 to prevent vibration of the straps.
wheel has become worn out it is impossible to 7.0
insert a new'wheel until all of the parts have
been restored to initial position. This is accom
plished by rotating the hand wheel 12 in the re
verse direction Which acts to not only restore the
guard 6 to the full line position shown in Fig. 4
3
2,130,828
but also acts to move the screws 46 and 46' in
the reverse direction so as to separate the com
2. In a grinding machine, a spindle, a grind
ing wheel mounted on said spindle, a guard for
panion sheave members on the motor shaft 32
and bring together the companion sheave mem
bers on the jack 33 to reduce the speed of the
said wheel, a motor shaft, driving connections be
tween said shaft and spindle comprising variable
driving and driven sheaves interposed therebe
grinding wheel spindle.
One of the advantages of this construction is
the employment of a jack shaft, this jack shaft
arrangement being peculiarly adaptable to an
arrangement in which a grinding wheel is located
upon each end of the spindle, which arrange
ment, however, is not shown in the present in
stance. It is essential that the mechanism for
varying the sheave members of the driving pul
leys be located on the end of the shafts (either
the motor shaft or the jack shaft) so that it will
be apparent that if no jack shaft is employed it
would be impossible to position a set of the vari
able driving sheaves directly upon the wheel spin
20 dle where a grinding wheel was located on each
end of the spindle. It will be understood that
the sizes of the pulleys upon the motor shaft
and upon the jack shaft are the same,‘but that
the sizes of the plain pulley upon the jack shaft
25 and upon the wheel spindle may vary depending
upon conditions of design.
Having thus described my invention, I claim:
1. In a grinding machine, a spindle, a grind
ing wheel mounted on said spindle, a guard for
said wheel, a motor shaft, driving connections be
tween said shaft and spindle comprising variable
driving and driven sheaves interposed therebe
tween each consisting of relatively movable com
panion members having opposed outwardly ta
pered faces, a belt passing about said sheaves,
manually-operated devices for adjusting said
guard toward said wheel as the wheel wears, 1O
means operated by said manually-operated de
vices to simultaneously adjust the distance be
tween the companion members of said sheaves to
increase the effective radius of the belt contact
of the driving sheave and decrease the e?ective
radius of the belt contact of the driven sheave,
said means comprising a sprocket wheel operated
by said manually-operated devices, a sprocket
wheel associated with each of said sheaves, and
a chain passing about said sprocket wheels.
3. In a grinding machine, a spindle, a grinding
wheel mounted on said spindle, a guard for said
wheel, a motor shaft, driving connections between
said shaft and spindle comprising variable driv
ing and driven sheaves interposed therebetween
each consisting of relatively movable companion
members having opposed outwardly tapered faces,
a belt passing about said sheaves, manually-oper
ated devices for adjusting said guard toward said
wheel as the wheel wears, means operated by said '
manually-operated devices to simultaneously ad
driven sprocket wheel, a segmental rack meshed
with said pinion, a pivoted rocker beam having
just the distance between the companion mem
bers of said sheaves to increase the effective
radius of the belt contact of the driving sheave
and decrease the effective radius of the belt con- 7
tact of the driven sheave, said means comprising
a sprocket wheel operated by said manually-oper~
ated devices, a sprocket wheel associated with
each of said sheaves, and a chain passing about
said sprocket wheel, said means also including an 40
adjusting screw associated with each sheave, one
one end connected with said guard, and means
of a right-hand and the other of a left-hand
including a pivoted link for connecting said seg
mental rack with the other end of said rocker
beam.
thread, said sheaves being connected with said
sprocket wheels.
tween each consisting of relatively movable com
panion members having opposed outwardly ta
pered faces, a belt passing about said sheaves,
manually-operated devices for adjusting said
guard toward said Wheel as the wheel wears, said
devices comprising a pair of sprocket wheels, a
chain for driving one of said sprocket wheels from
.19 the other, a pinion connected to rotate with said
JOHN C. WILSON.
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