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Патент USA US2410931

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Nov. l2, 1946.
c. ElsLER-
2,410,931
TUBE GRACKING rvfAcHINE`
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Filed March 30, 1944
2 Sheets-Sheet 1
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Nov. 12, 1946.
c. ElsLER
2,410,931
TUBE CRACKING MACHINE
Filed March so, 1944
2 sheets-sheet 2
IN VEN TDR
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Patented Nov. 12,1 1946
’2,410,93l
UNITED f STATES PATENT . >OFFICE
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TUBE»
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CRACKVINGMACHINE»
2,410,931".
>Charles Eisler, South OrangeLNJ. »¿
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Application March 30, 1944, Serial No. 528,812- ; "
4 claims. (o1. «r9-_50)
This invention relates to a machine for re
ducing the length of glass tubes and is particu-'
larly designed t0 crack olf the end or ends of
glass tubes of comparatively large diameters and
plateslor supports V3l. and 38 which can be fixed
at any distance to control the required length of
the glass tubes. .The plates are-secured in place
by the set-screws 39. Each transverse plate car
ries the vertical electrodes in pairs, 40 and 4I,
and ‘l2 and 43, screwed into the insulating bush-4
ings fili, the electrode pairs being connected in
series by the heating wires 45 and the terminal
with thin walls such as are used in lighting, the
inside of the tubes having a fluorescent coating.
The present machine employs a hot Wire crack
ing method in conjunction with specially de
signed mechanical means and a specially de
45, current being supplied by the secondary coil
signed cracking knife. The machine as disclosed 10 4l of the transformer 28 through the ñexible
in this application has been found to cut off or
conduits 49 and 50.
'
`
crack the end of a thin-Walled glass tube leav
The heating wires 45 are bent in a semi-circle
ing a smooth even edge with no jagged parts to
to form a loop so as to partly encompass the
interfere with the accurate mounting of a tube
revolving glass tube with a slight clearance in
in a ñxture. By this means a tube of the proper
order to avoid direct heating contact with the
length can be accurately produced and this `with
glass, as contact would cause sudden over-heating
out any damage to any fluorescent lining that
of the glass which would result in premature
the tube might have.
'
cracking and breaking of the tubes. The tubes
The invention is also designed to provide a ma
are therefore locally heated, gradually and uni
chine that can be conveniently adjusted to pro
formly at the desired locations, the actual crack
vide for various lengths of tubes and containing
ing off being then accomplished by the keen edge
details of construction to be more fully described
of the Carborundum knives 5|. The Carborun
hereinafter and also embodied in the claims.
dum or similar knives 5| are secured to the arms
The invention is illustrated in the accompany
54 by the washer plates 52 and bolts 53. In the
ing drawings, in which Figure 1 is a plan view
25 ' form shown the arms 54 are secured on the shafts
of a machine for simultaneously processing two
55. The knives 5| are in exact alignment with
tubes. Figure 2 is a cross-section of the upper
the heating wires 45 so that when the shafts 55
part of the machine showing the appliances used
are turned by levers 56 actuated by foot treadle
in the cracking-off operation, and Figure 3`is
5l, the knives will tap the glass tube exactly at the
an end elevation of the machine and also illus 30 heated section. This causes the tube to crack
trating the mechanism for rotating the tubes.
neatly at the heated section, the cracked off ends
The machine is provided with a, base frame 5
dropping onto the table l. The construction
provided with a shelf 6 and the top ‘I which
shown includesthe foot treadle 51 which is con
supports the side frames 8 and 9, to the top of
nected by links or Wires with the lever 56 of the
which are secured the multiple bearing members
shafts 55. The arms 54 with the knives are
|| and |2 respectively by means of the bolts I0.
subsequently returned to non-operative position
The spindles I6, |‘I and I8 are journalled in
by the counterweights 58.
the bearings I3, I4 and I5, respectively.
The
In the machine shown for two tubes, it is as
rollers I9, 2|) and 2| are secured on the spindles
I6, Il and I8 respectively and form a cradle for 40 sumed that both tubes 22 and 23 are cracked
oil at the same time since it requires little time
the glass tubes 22 and 23, the spindles being
to heat the tubes to the required temperature
spaced close enough together to provide the
for cracking off, and the capacity of the machine ,
proper support.
is more than if tubes were alternated in the ma
The motor 24, by means of the belt 25, the
speed-reduction unit 26 and the transmission 21 45
drives the shaft 28 on which is mounted the
pulley 29, which, by belt 30, drives the pulleys 3|,
chine.
I claim:
l. A tube cracking machine comprising a
frame member, rollers rotatably supported in
32 and 33, which are secured on the spindles I6,
said frame in parallel, spaced relation, said rollers
Il and I8. The adjustable idler 34 is inter
posed to insure proper traction of the belt 30. 50 being adapted to rotatably, horizontally support
the tube to be cracked, a heat-imparting ,wire
The rollers I9, 2|) and 2| are thus rotated in
member of generally semi-circular outline posi
unison and impart rotation to the tube or tubes
tioned in said frame in alignment with and
supported on them.
spaced adjacent the position of said tube to en
On the shafts 35 and 36 fixed on the side frames
compass the lower portion of the tube, an arm
8 and 9 are slidably mounted the transverse
pivotally mounted in said frame in alignment
2,410,931
3
with said Wire, said arm having a free end re
mote from its point of pivot, a. knife on the free
end of the arm, and means to pivotally move the
arm, said arm being of such proportions and be
ing so positioned in said machine that it may be
pivoted to bring the knife into contact with the
tube at a point in alignment with and above the
position of the Wire member.
2. A tube cracking machine comprising a frame
4
member, means in said frame to rotatably, hori
zontally support the tube to be cracked, a heat
imparting Wire member positioned in said frame
in alignment with and spaced adjacent the posi
tion of said tube to encompass a portion of the
tube, an arm mounted in said frame in align
ment with said wire, a knife on said arm, and
means to move the arm to bring the knife into
contact with the tube at a point in alignment
the position of the wire member.
`
member, rollers rotatably supported in said frame 10 With
4'. A tube cracking machine comprising a, frame
in parallel, spaced relation, said rollers being
adapted to rotatably, horizontally support the
tube to be cracked, a heat imparting Wire mem
ber of generally semi-circular outline positioned
member, means in said frame to rotatably, hori
Zontally support the tube to be cracked, a heat
imparting Wire member positioned in said frame
in alignment with and spaced adjacent the posi
in said frame in alignment with and spaced ad 15 tion of said tube therein to encompass the lower
jacent the position of said tube to encompass the
portion of the tube, an arm pivotally mounted in
lower portion of said tube, an arm mounted in
said frame in alignment with said wire, a knife
said frame in alignment with said Wire, a knife
ñxed to said arm, and means to move the arm
on said arm, and means to move the arm to
to bring the knife into contact with the tube at
20
bring the knife into contact with the tube at a
a point in alignment with the position of the
point in alignment with the position of the Wire
Wire member.
member.
CHARLES EISLER.
3. A tube cracking machine comprising a, frame
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