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ou. 15, 194s.
Filed 4Api-i1 29, 1942
2,409,57 l
Patented Óct. 15, 1946
Charles W. Leguillon, Akron„0hio, assigner to
The B. F. Goodrich Company, New York, N. Y.,
a corporation of New York
Application April 29, 1942, Serial No. 440,928
(Cl. 154--10)`
1 Claim.
the depth of the splice so that virtual cohesion
ofthe materials ofthe interfaces or line of con
tact between the two spliced ends is attained for
a strong union.
Referring to the drawing, which shows an em
bodiment of the invention, the numeral l0 des
ignates a pedestal, fixed to a base Il, `and having
an arm l2, of tubular form, projecting hori
zontally thereof. A hub I3 is ñxed to the outer
This invention relates to the splicing of plastic
rubber-like material and is especially useful in
perfecting the seams of articles of rubber-like
material, especially those of considerable thick
ness, such as tire treads.
In the manufacture of articles of unvulcanized
rubber composition or other `rubber-like materi
als, especially where the materials were of sub
stantial thickness,v it has been necessary to splice
slabs or strips of material, as in forming endless 10 end of the arm and supports an anvil lll having an
arcuate face adapted to support an annulus l5
bands or the like, and for this purpose the ends to
such as a tire band having a splice to be treated.
be spliced have been scarfed or skived, overlapped,
Above the anvil, a second arm, comprisinga pair
and brought together. Great difficulty has some
of parallel guide rods Il, i8 and a yoke i9 extends
times been experienced in obtaining a perma
from the pedestal and is supported
nent union of the material at the splice, especially
against vertical deflection by a brace 2ï) connect
in the use of synthetic rubber materials. .
ing its outer end tothe pedestal.
The principal objects of the present invention
A rotatable shaft 2l is journaled in the yoke i9
atv the outer ends of rods I7, i8 and in the ped
entirely through the depth thereof, to provide
an intermingling of the spliced materials by a 20 estal lill through which it extends. The shaft has
an enlarged threaded portion 2 la and reduced un
kneading or wiping action throughout the depth
threaded end portions 2lb, Zic and extends par
of the splice even in the case of thick slabs, to
allel to guide rods Il, I8 and therebetween. A
effect simultan-ecus pressing and rubbing or wip
carriage 22 is mounted for movement along the
ing of the splice faces `aganst each other
throughout the depth of the seam by localized 25 guide rods l1, i8 toward and from the pedestal
and has anti-friction rollers 23 which support it
and progressive deep kneading ofthe materials,
are to provide for a strong union of the splice
and to provide apparatus for effectively providing
such kneading of the splice by power and pro
The shaft 2i has a multiple grooved pulley 25
These and other objects will appear from the
following description and the accompanying
Of the drawing:
from the rods. A threaded nut 24 engages the
screw shaft 2l and is fixed to the carriage 22.
Fig. 1 is a side elevation of apparatus in ac
cordance with and embodying the invention, parts '
being broken away, with a drum-built tire casing
iixed thereto or driving it from an electric motor
26 on theV pedestal through motor pulley 2l and
V-belts `28. Thearrangement is such that by
reversal of the motor the screw shaft 2i may be
driven in either direction to cause the carriage 22
to move toward or from'the pedestal. At a po
sition near the pedestal and short of contact of
the carriage 22 with the pedestal, the nut 2li may
leave the threaded portion of the shaft but is
Fig. 2 is va sectional view taken on line 2_2
held‘ against the threaded portion by a coil spring
of Fig. 1, parts being broken away.
30, and at the opposite end of the screw shaft
Fig. 3 is a sectional view taken on line 3-3
the nut may leave the threaded portion but is
of Fig. 1, showing the splice.
held thereagaínst by a second compression coil
Fig. 4 is a sectional view taken on line 4-4
spring 3l. This arrangement limits movement of
of» Fig. 3.
In accordance with the invention the rubber 45 the carriage upon over-running of the shaft.
For positioning a tire band i5 on the anvil Iii, a
like' material at the splice is subjected to a pro
forked stop arm 32 is fixed to a cross shaft 33
gressive kneading action by supporting it .be
journaled in` arm I'Z. A pair of stops 3i, 35 are
neath a roller having alternate toothed projec
also ñxed to the sameshaft. A pin 3B on carriage
tions and cross grooves, the projections being
22 is adapted to hold the arm 32 in a vertical posi
deep, approximating the thickness of the mate
rial at the splice to effect deep penetration or dis 50 tion when `thecarriage 22» is near the pedestal,
including a tread slab in placethereon. l
tortion of the stock, and subjecting ‘it to rolling
action of the toothed surface under suflicient
pressure to knead the material into intimate sur
face engagement by a simultaneous pressing and
sliding or rubbing of the interfaces throughout
raising stops (ill,v 35 abovethe arcuate face oían
vil lil,` At-an advanced position of the carriage,
the `stops 34, `35 may `drop below the anvil surface
until a stop-,arm 3l on‘sliaft 3?»> prevents further
' movement by contact with arm l2. This permits
the splice treating roller to contact the tire band
without interference of the stops. In the posi
tion assumed by the tire band against the stops
it overhangs the anvil so that the bead portion
thereof may be downwardly deflected by the
For treating the splice, a splice treating roller
46 is mounted on a horizontal shaft 4I journaled
in a yoke 42 carried by carriage 22. Yoke 42 is
ñxed to rods 43, 44 slidably mounted in ears 45,
46 of the carriage 22 for vertical movement.
Compression coil springs 41, 48 encircle the rods
43, lill and force the yoke downwardly. For this
purpose adjustable collars 49, 50 are threaded on
the rods and the lower ends of the coil springs im
pinge against them while the upper ends of the
springs impinge against ears 5I of the carriage
through which the rods slidably extend. Stop
urges the arm 63 in a counter-clockwise direction
in Fig. 1. The anvil I4 extends outwardly be
yond the band II5 and its extending portion has
a slot 61 formed therein and extending in the
direction of arm I2. The free end of arm 63 is
guided in the slot and may be moved by the
springs to a position shown in dot andv dash lines
in Fig. l where its end acts as a stop to hold the
band I5 in position against outward movement.
A limit switch 68 is mounted on arm 63. A toggle
arm 69 is pivoted on the free end of arm 63 and
a ñnger 10 thereof is concealed in slot 61 in the
full line position of arm 63 in Fig. 1 and is pro
jected thereabove in the dot and dash position in
the path of a pin 'II carried by yoke 42. Toggle
arm 69 is held out of contact with a roller arm
’i2 of limit switch 68 by a tension coil spring 'I3
attached to arm 63 and toggle arm 69. The ar
nuts 53 are threaded on the ends of the rods above
rangement is such that as carriage 22 advances
these ears to limit lowering movement of the 20 in a direction away from pedestal I0, pin 1I en
splice treating roller. The arrangement is such
gages ñnger 1Q and toggle arm 69 closes limit
that the roller is urged to its lowermost position
switch 68 reversing motor 26 and thereby revers
by the springs and the tension of the springs may
ing the movement of carriage 22.
be adjusted to provide the desired pressure by
A rocker arm S6 is pivoted at SI on a bracket 82
adjustment of nuts 49, 56 while the normal posi 25 fixed to pedestal I0. One end of the rocker arm
»tion of the roller may be adjusted by adjusting
is pivoted to an adjustable shackle 83 on a link 84
nuts 53.
which extends through pedestal I0 and arm I2
The splice treating roller 40 is formed about its
to pivotally engage arm 63 at 85, The shackle 83
periphery with axially extending alternate ribs
has screw adjustment for lengthening or shorten
40a and grooves 46h, the grooves and ribs being 30 ing the link 84 to accommodate bands I5 of dif
of a depth approximating the depth of the rub
ferent width. The opposite end of rocker arm 80
ber-like material of the splice, and the roller is
is pivotally connected to an adjustable shackle
pressed downwardly against the spliced mate
86 on a push rod 31 which is slidably mounted in
rial with sufficient force to cause the ribs to pene
and extends through pedestal I0 in a position to
trate well into the spliced material, and prefera
engage arm 36 o-n carriage 22. The arrangement
bly nearly therethrough as shown in Fig. 4. Re
is such that as carriage 22 moves toward the ped
ferring to Fig. 4 the splice ends of the band I5 are
estal it engages rod 81 and swings arm 30 to force
shown in section overlapping each other and are
arm 63 outward to the full line position of Fig. 1
designated I5a, |517. ït will be seen that these
and as carriage 22 moves away from the pedestal
ends are joined by a seam 60 and that the ribs 40a 40 springs 65, 66 return arm 63 to the dot and dash
of the roller 4U penetrate the material to an ex
line position and rod 81 is advanced through
tent that the seam line is deflected.
pedestal Ii] to the right in Fig. 1 where it is in the
The strong union results apparently from the
path of arm 36.
fact that such action of the ribs stretches the ma
A limit switch 98 is mounted on pedestal IG in
terial at the seam while forcing it firmly into in
the path of a cam surface QI on carriage 22. A
timate contact by a wiping or kneading action
starting switch 92 is mounted on the base II for
causing the interfaces to be rubbed together
foot operation. Switches 68, 90 and 62 are in the
throughout their depth to effect initial cohesion
control circuit to motor 26 and the arrangement
of the material of the interfaces.
is such that switches 90 and 92 are in parallel and
As the material is subjected locally to high 50 control motor 26 in one direction of rotation, and
pressure applied at the tops of the ribs, the ma
switch 68 controls motor 26 in the opposite direc
terial opposite the grooves between the ribs is
tion of rotation. The arrangement is such that
free from pressure and is confined only laterally
with the motor at rest the apparatus is in the posi
between the ribs so that material of both over
tion of Fig. 1 and switch 96 is open. When the
lapping ends wells upwardly between the ribs 55 operator steps on switch 92 the motor circuit is
and great stretching and tendency of the ends to
completed and motor 26 rotates in a direction to
slide upon each other is provided, the churning or
rotate screw shaft 2| so that carriage 22 travels
kneading of the material of the ends upon each
away from the pedestal thereby closing switch 90.
other causing them to seize each other by virtue
At the outward end of the stroke switch 68 is
of the ñow of the material. As the ribs are with 60 closed by Contact pin 1I with toggle arm 69 re
drawn the material recovers approximately its
versing the motor to return the carriage. When
original shape due to the considerable elasticity
the carriage returns to a position adjacent pedes
of the unvulcanized rubber-like material. By re
tal I Il, switch 96 is opened again reversing the mo
peated rolling back and forth across the splice,
tor and the carriage if switch 92 is still depressed.
the roller, being free to rotate, contacts the mate 65 If switch 92 is 4not depressed, opening of switch
rial in diiïerent attitudes so that the ribs de
90 will open the motor circuit and stop the car
press diiîerent areas successively and knead the
material into a firm union.
In carrying out the procedure of the invention,
For reversing the travel of the splice-treating
an article having a splice of plastic material
roller, a link 6I is pivoted at 62 on the hub I3, 70 therein such as the tire band 4I5 is placed on the
andan arm 63 is pivoted to the link at 64. A
anvil I4. The motor 26 is Vstarted by depressing
tension coil spring 65 extends from the link |6I at
the foot switch 92 and the splice treating roller
the pivot 64 to the anvil I4 and urges the link
is caused to traverse the splice back and forth
Another tension coil spring 66 ex
as many times as desired whileA the roller _is
tends from the free end of arm 63 to the anvil and 75 pressed strongly against the spliced material by
the springs 4T, 48. In rolling across the spliced
material, the raised ribs on the roller are forced
into the plastic material to a substantial depth,
locally stretching the spliced ends at their faces
of contact so as to obtain an intimate rubbing
action of such faces throughout their depth while
applying pressure thereto and kneading the ma
terial thoroughly together at the splice.
rial along the splice, a carriage adapted to be
moved back and forth along the splice, a splice
treating roller rotatably mounted on the carriage
in position to engage the material at the splice,
means for pressing the roller against the mate
rial along the splice during its oscillating move
ment, said roller having alternate axially disposed
ribs and grooves on its face for kneading the
Variations may be made without departing
material deeply and progressively along the splice,
from the scope of the invention as it is deñned by 10 means in the path of said carriage for locating
the following claim.
the spliced material, and means for withdrawing
I claim:
said locating means from contact with said
Apparatus for treating unvulcanized rubber
like tread material to effect a union of a splice
throughout the depth of the splice, said appara
tus comprising means for supporting the mate
roller as the roller approaches said locating
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