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Патент USA US2061321

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‘
Nov. 17,- 1936.
‘ H H KNOTT
~
2,061,321
CHUCK CONSTRUCTION
Filed Dec. 4, 1934
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Patented Nov. 17, 1936
ATENT OFKQE
UNITED STATES
2,061,321
CHUCK CONSTRUCTION
Harry H. Knott, Washingtomlowa, assignor to
American Pearl Button 00., Washington, Iowa,
a corporation of Iowa
Application December 4, 1934, Serial No. 755,900
4 Claims. (Cl. 279-51)
On the accompanying drawing, I have used
An‘ object of‘ my invention is to provide a
chuck for button blanks or the like, the chuck
being comparatively inexpensive to manufac
ture and simple in its construction.
More ‘particularly it is my object to provide a
chuck construction especially adapted for hold
ing button blanks or‘ other semi-fragile elements
in such manner that the possibilities of chipping
the edges of the blank are minimized and also the
10' tendency for the blank to spring out of the
chuck is minimized;
Still another object is to provide a spindle
likev chuck element of the split contractible type
with a removable element for engaging the but
15 ton blank or. the like in such manner that it is
?rmly held without danger of chipping.
Still another object is to provide a split chuck
with an annular groove with which a resilient
contractible ring may be associated so that the
ring itself rather than the metal of the chuck
will engage the edge of a button blank’ or‘ the like
to hold itwhil'e performing operations thereon.
A further object is to provide a removable
blank engaging element and a method for re
2,5‘ newing it, which method is simple and quick to
perform.
With these and other objects in view my in
vention consists in the construction, arrange
_ ment and combination of the various parts of my
“ device, whereby the objects contemplated are at
tained', as hereinafter more fully set forth, point
ed out in my claims and illustrated in the ac
companying drawing, in which:
Figure 1 is a plan View of a chuck construction
embodying my invention, showing the button
blank received therein.
Figure 2 is a. vertical sectional‘ view on the line
2-—2 of Figure 1 showing a blank. being held in
the chuck and a tool being used on the blank.
Figure 3 is a, separated perspective view of‘ my
chuck construction comprising a spindle-like
chuck element and a renewable resilient blank
engaging ring.
Figure 4 is a plan view showing the ring in
45 position and partly split according to my method
for renewing the ring.
Figures 5 and 6 are enlarged sectional views on
the lines 5-—5 and 6—6 respectively of Figure 1,
illustrating the action of the resilient ring of
50 my chuck.
Figure '7 is a plan view of a conventional chuck;
and
Figure 8 is a side elevation of another form of
chuck including my invention, part of the chuck
55 being broken away.
the reference character A to indicate generally
a spindle-like chuck element and B a resilient
ring for association therewith. The chuck A has,
as shown in Figure 3, a shank It provided with a
cone-portion l2 and an enlarged head it. The
head M has therein an annular groove l6 ter
minating in an outer supporting flange Ill. The
chuck is split twice at right angles to each other,
they split spaces being indicated at 20. The ele
ment A with the exception of the groove l 6 is
now in general use and one of such chucks is
shown in Figure 7 as A’, the parts thereof cor
responding to the chuck A, having the same ref
erence numerals with the addition of the dis
tinguishing characteristic “a”.
The chuck A’ is shown as having a button
blank 0 therein. These blanks are not always
perfectly round and the out-of-roundness of the
blank C has been exaggerated in Figure '7 so 20
that it contacts at but three points a with the
chuck A’. Exaggerated spaces 1) are illustrated
which in actual practice may be only one or two
thousandths of an inch, but nevertheless since
the ?ange l8a is non-resilient and the blank it 25
self is non-resilient, there will be no engage
ment at these points, so that the blank is en
gaged at but a very small percentage of its pe
riphery. Accordingly, when a tool, such as a
grinder, shown at 22 in Figure 2, is used on the
blanks many of them are chipped on the edges
and‘ some of them spring out hi the chuck.
Chipped blanks, of course, are unusable and there
is therefore considerable waste experienced.
By providing the annular groove Hi to receive 35
the resilient ring B as is obvious from an in
spection of Figure 3 I am able to overcome the
difficulties enumerated in connection with the
chuck A’ in Figure 7. The ring is of slightly
greater cross sectional thickness than the width
of the groove, as is evident from Figure 5, so that
it mustv be forced into. the annular groove and
will accordingly be retained there by its tendency
to re-expand to its original thickness. After
it is forced into the groove a saw or other cut
45
ting tool is run through the split spaces 20, the
vertical one of which has been so sawed through
as illustrated in Figure 4 and the horizontal one
being now ready for sawing through.
50
The method of installing the ring just described
facilitates the installation because it is easier to
force the entire ring into the groove than to force
individual segments of the ring into the individual
segments of the chuck and. get the two in proper 55
2
2,061,321
relative alignment. The job can be done in less
than half the time by this method.
taken out and a new ring B inserted and sawed
After the ring segments, which are designated
by the reference numeral 24, have become too bad
ly worn for further service, they can readily be
dug out of the groove segments for the purpose of
inserting another ring as just described.
necessary.
The same out-of-roundness blank C is shown
engaged by the chuck A of Figure l as was illus
10 trated in Figure '7. It will be noted that the
segments 24 conform to the shape of the periph
ery of the blank, the sectional Figures 5 and 6
showing respectively relatively loose (yet ?rm)
and tight engagement of the same points on the
periphery of less than greater radii respectively.
Even where the edges of the blank are relatively
loosely engaged as in Figure 5, there would be a
slight over-hanging, as indicated at 2B, of‘ the
upper edge of the segment 24 with respect to the
button blank, this deformation of the segment
insuring against the button blank ?ipping out of
the chuck when a tool is used on the blank.
The
?ange segments l8 back up the segments 24 and
serve as supports counteracting the tendency for
the blank to enlarge the blank-engaging seg
ments 24.
Heretofore. with all metal chucks the ?ange
segments l8 received considerable wear and after
,‘a few months’ service the chuck A had to be
30 thrown away, as it would no longer hold the
blanks. With my removable insert ring B, how
ever, it is merely necessary to take a few minutes’
time to renew this element which is very inex
pensive and the metal portion of the chuck can
to Q1 thus be used repeatedly for an inde?nite length of
time. This obviously effects a considerable econ
omy over the old method.
The chuck A is ordinarily used in a drill press
type of button blank machine. Some of the con
40 veyor types have chucks such as shown in Figure 8,
except that they are all metal and do not include
the annular groove I6 and the resilient segments
24, which I have already described. The chuck
in Figure 8 is indicated generally by the refer
ence character A" and is of shaft-like construc
through, as has been already described, whenever
From the foregoing description it will be obvi
ous that I have conceived a novel and economical
means for removing the blank engaging element
on a button blank chuck or the like and that
such element is far superior to the all metal chuck
now in general use. Although I have described
the ring B as being resilient, it is obvious that 10
the degree of resiliency may vary greatly, depend
ing upon the material used to form it. I have
found rubber quite satisfactory, although of
course, other materials would be suitable. Also,
the rubber may be hard or soft as required and 15
a change of this character, as well as others, may
be made without departing from the real spirit
and purpose of my invention, and it is my inten
tion to cover by my claims any modi?ed forms of
structure or use of mechanical equivalents, which
may be reasonably included within their scope.
I claim as my invention:
1. In a button blank chuck, a spindle-like chuck
element, said element being split into a plurality
of parts whereby said parts may be sprung toward 25
each other, an annular groove in an end of said
chuck element, a supporting ?ange outside of and
projecting beyond said groove and a resilient but
ton blank engaging ring partially in said groove
and partially against said ?ange, said ring being 30
split coincident with the split spaces of said chuck
element.
2. In a button blank chuck, a spindle-like chuck
element, said element being split into a plurality
of parts whereby said parts may be sprung to 35
ward each other, an annular groove in an end of
said chuck element, a supporting ?ange beyond
said groove and a resilient button blank engaging
ring partially in said groove and partially against
said ?ange.
40
3. In a chuck construction, a spindle-like chuck
element having a depression in one end thereof
and an annular groove surrounding said depres
sion, an annular ?ange surrounding said groove
on a cam track (not shown) which at the proper
and extending beyond the bottom of said depres 45
sion and a resilient blank engaging ring partially
in said groove and partially against said ?ange,
said chuck element comprising a plurality of parts
movable toward each other for contracting said
time raises the chuck, causing the cone lZa to
engage a reduced portion of the bore in which the
chuck is mounted (not shown) for contracting the
chuck. The chuck A is contracted by the cone
ring.
50
4. In a chuck construction, a spindle-like chuck
element having a depression in one end thereof
and an annular groove surrounding said depres
[2a similarly engaging a part of the machine when
the chuck is moved downwardly.
Chucks such as A” of Figure 8, when made of all
metal, must have their upper ends turned down
sion, an annular ?ange surrounding said groove
and extending beyond the bottom of said de 55
pression and a resilient blank engaging ring par
tially in said groove and partially against said
?ange, said chuck element comprising a plurality
of parts movable toward each other for contract—
ing said ring, said ring comprising a plurality of 60
parts one for each part of said chuck element.
tion, similar to the chuck A, but having a taper
I2a reversely arranged. On the lower end of the
chuck, a thrust ball 28 is provided which travels
occasionally as they wear away. The chuck must
then be lengthened so as to retain its original
GO length in the machine for proper operation.
All
of this takes considerable time and skill, whereas
with my invention the chuck A" can remain in
its original dimensions, the segments 24 being
HARRY H. KNOTT.
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