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'Dec.3,194é.
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J, KAPLAN
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2,412,048
MEANS FOR GRINDING. SMALL-HOLED BUS'HINGS
Filed Nov.‘ 24, 1945 ,
INQENTOR ,
Josey/2 [(61
BY5a’ _
ATTORNEY
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2,412,048
Patented Dec. 3, 1946
UNITED, STATESIPATENT OFFICE
2,412,048
MEANS FOR GRINDING SIHALL HOLED
BUSHINGS
Joseph Kaplan, Brooklyn, N. Y.
.
Application November 24, 1945, Serial No. 630,638
3 Claims. (01. 51-103)
1
2
small holed bushings or other parts where the
Fig. 5 is an enlarged axial section through the
?tting and bushing, which are in mating position.
Fig. 6 is a perspective view of the ?tting and
ings making it di?icult if not impossible to han
to be ground rotates, while it is being ground byv
dle same in conventional machines.
a grinding wheel. The diameter of the ‘wire
should be preferably about one to several ten
thousandths of an inch less in diameter than the
bore in the bushing in order to get good results in
This invention relates to new and useful im
provements in a machine for the grinding of
the corresponding holding part pictured in detail
outside periphery is to be concentric or in similar
relation with the holes.
5 apart from the remainder of the machine.
The main principle of the present invention
More speci?cally, the present invention pro
consists in having a centrally aligned stretched
poses the construction of a, machine for grinding
wire held ?rmly in between two chucks. The wire
small parts such as bushings having a center bore
acts as a stationary axis over which the bushing
of extremely small size, the small size of the bush
The new invention has particular application
to the art of grinding to size, extremely small
bushings concentric with their holes. Using it,
an extremely high degree of accuracy will be 15 the concentricity of the inside and outside diam
eters of the bushing.
readily and consistently obtained, even where it
The machine, according to this invention, com
is required to prepare very large numbers of small
prises two parallel vertical standards l0 and H
bushings in rapid succession on one and the same
holding two stationary chucks l2 and 22 respec
machine, utilizing but a minimum amount of time
tively. The construction of the tail stock of a
for aligning, precision grinding and ejecting the
lathe will very well suit the purposes of chuck
bushings. It will readily be seen that the new
22 in adjusting the distance between the two
method and machine are extremely efficient in
chucks as needed. In the present instance chuck
operation, yet eminently simple in design, easy to
22 is shown as having a stem 13 sliding in a bore
install, and relatively easy .to operate Without dif
?culty even by unskilled operators lacking pro PO .~v1 in the standard I I, a set screw 28 being employed
for locking the chuck 22 in any adjusted posi
longed periods of training and instruction hereto
tion.
.
fore necessary for efficient operators in this art.
A ?tting or auxiliary bushing l1, best shown in
Many other advantages of the invention will
Fig. 4, is provided. Its function, as will presently
readily appear to those skilled in the art study
30 appear, is to drive the bushing 26 (Fig. 3) while
ing the teachings of the instant speci?cation.
it is being ground. The bushing l1 consists of a
A further object is to provide a machine for
piece of round stock of steel having a hole l9
grinding small bushings exteriorly concentric
drilled through the center and having a tooth
with their axial bores, said machine having a sta
extending diametrically across one end. This
tionary wire held taut between two vchucks, the
tooth 20 is adapted to ?t loosely in a slot 21 formed
wire forming a support for the bushing to be
in one end of the bushing 26. Bushing .26 has
ground.
an axial bore 25.
For further comprehension of the invention,
An electric motor 3| drives a pulley l4 mount
and of the objects and advantages thereof, ref~
ed on the standard In by means of a belt. A dog
erence will be had to the appended claims in
which the various novel features of the invention 40 2| is secured to the pulley and has a collar sur
rounding the bushing l1 and secured thereto by a
are more particularly set forth.
set screw 18. The dog has two arms secured in
In the accompanying drawing forming a mate
holes in the pulley. Thus rotation of the pulley
rial part of this disclosure
effects rotation of the dog and consequently ro
Fig. 1 is a front elevational view showing the
tation of the auxiliary bushing, the auxiliary
machine of the present invention with the bush
bushing, when its tongue 20 is disposed in the slot
ing to the ground in position for having the meth
21 of the bushing to be ground, rotating this bush
od of the present invention performed thereon.
ing. !
~
Fig. 2 is a plan view taken from above and
In order to prepare the bushing 26 for external
showing the embodiment of the invention shown
grinding, the bore 25 must ?rst be made and the
in the preceding ?gure.
slot 21 must be milled therein. After the external
Fig. 3 is a perspective view of a bushing used
surface is ground, the end having the slot 21 may
and prepared in accordance with this invention.
be ground to eliminate this slot.
Fig. 4 is a perspective view in detail showing
The machine further comprises'a wire “i which
the keyed ?tting which holds and causes rotation
is ?rst secured in the chuck I2. The auxiliary
of the bushing of Fig. 3.
2,412,048
3
4
bushing I1 is then slid on the wire and into the
collar of the dog where it is secured by the set
screw l8, the arms of the dog being inserted
in the holes in the pulley. Then the bushing 26
to be ground is slid on the wire, the tooth 20 and
slot 2'! being adjacent each other and inter
?tting. The end of the Wire I6 is then gripped
in the chuck 22 which is then adjusted longitudi
nally to give the correct distance between the
faces of the two chucks and the adjacent, faces 10
of the bushings. This distance is preferably only
a few thousandths of an inch, but is shown larger
in the drawing for clarity. That is to'say, the
‘bushings, When inter?tted, do not entirely ?ll the
.
wire or rod secured at its ends therein, an aux
iliary bushing mounted on said wire or rod said
bushing to be ground being adapted to be mount
ed on said wire or rod next to said auxiliary bush
ing, said auxiliary bushing having means for lock
ing with said bushing for rotating the same when
said auxiliary bushing is rotated, and means for
rotating said auxiliary bushing.
,
2. A machine for grinding a bushing or the like
having a central bore and a diametral slot in its
end comprising two spaced standards, a pulley
mounted on one of said standards for rotation, a
chuck-secured to said standard, an electric motor
for driving said pulley, a chuck adjustably se
space between the chucks but some clearance is 15 cured to said other standard, a wire or rod se
permitted to allow the bushings to rotate unham-l
pered.
cured at its ends in said chucks, an auxiliary
vbushing freely supported on said wire or rod, a
dog .secured to said auxiliary bushing and to said
A grinding wheel 29, mounted on a shaft .39,
is shown fragmentally in Figs. 1 and 2. This
pulley for rotating said auxiliary bushing, said
wheel is rotated by another motor, in a well known 20 auxiliary bushing having a diametral tongue in
one of its ends for inter?tting with said slot in
manner, to grind the bushing 26. The wheel
said bushing to be ground, said bushing to ‘be
29 will be mounted for longitudinal movement
ground being adapted to be freely supported on
along the bushing 28. As grinding wheels of this
type are well known, no further description or
said wire or rod, and rotatable grinding means
for grinding the exterior surface of said bushing
showing thereof is deemed necessary.
to be ground.
'
In order to grind the bush-ing 2B, the motor
3. A machine for grinding a bushing having
3| is started and thus the bushing 26 rotates.
At the same time the grinding wheel 29 is ‘started.
an axial bore and a diametrical slot in one end
comprising two spaced standards, a chuck rigidly
The wheel 29 isrmoved back and forth along the
bushing 2-6 until the exterior surface of the bush
secured to one of said standards, a chuck adjust:
ing has been ground the desired amount. After
.ably secured to the other of said standards, a pul
the outside diameter of the bushing is ?nshed
ley rotatably mounted on the ?rst of said stand
ards, means for rotating'said pulley, a wire or
to size, the chuck 22 ‘is opened and the bushing,
28 removed and a new one inserted on the wire
rod secured at its ends in said chucks, a ?tting
I'B, whereupon the operation is repeated.
rotatably mounted on said wire or rod having a
diametrical tongue on one end for inter?tting
While I haveillustrated and described the pre
with said slot when said bushing is mounted on,
ferred embodiments of my invention, it is to be
understood that I do not limit myself to the pre
said wire or rod, a dog connecting said ?tting
cise constructions herein disclosed and the right
and pulleyv for rotation of said bushing, said dog
is reserved to all changes and modi?cations com
having two legs secured in holes in said pulley
ing within the scope of ‘the invention as de?ned
and a' collar surrounding said ?tting and provided
in the appended claims.
with a set screw for ?rmly locking said collar and
?tting and rotatable grinding means for grind
Having thusrdescribed my invention, what I
claim as new, and desire to secure by United
ing the‘ exterior surface of said bushing to be
States Letters Patent is:
ground.
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1. In a machine for grinding a bushing or the
like having a central bore, two spaced chucks, a
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V
JOSEPH KAPLAN. .
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