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Патент USA US3071821

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‘ Jan. 8, 1963
3,071,811
A. HERBERT
VULCANIZA-TION PRESS FOR VEHICLE TIRES
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Filed Jan. 27, 1960
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Jan. 8, 1963
A. HERBERT
' 3,071,311
VULCANI'ZATION mass FOR VEHICLE TIRES
Filed Jan'. 27, 1960
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Patented Jan. 8, 1963
1
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3,071,811
to ensure that the distensible member is inserted into the
tire at the latest when the press cover carrying the upper
VULCANIZATION PRESS FOR VEHlCLE TIRES
Adolf Herbert, Scheidstr. 2, Frankfurt am
press mould half has reached the closure position.
The invention relates to a new construction of these
Main, Germany
vulcanizing presses provided with a distensible member,
in which any pinching or" the portion of the distensible
‘ Filed Jan. 27, 1960, Ser. No, 5,076
Claims priority, application Germany Jan. 27, 1959
2 Claims. (Cl. 18-17)
member projecting beyond the tire in the opening posi
tion of the press is prevented with certainty.
For some years, the manufacture of vehicle tires has
For this purpose, according to the invention, in a vul
been carried out as a rule by the so-called fiat process, 10 canizing press having a lower press table carrying the
\ according to which the tire is built up successively of the
lower press mould half and an upper press cover, carry
individual components in the form of a cylindrical cover.
ing the upper press mould half, and a distensible member
The cylindrical tire band is then brought to the ?nal form
arranged centrally relatively to the lower press mould half,
the upper carrying ring of said distensible member being
> and vulcanized in one operation in a distensible member
- vulcanizing press.
15 movable from a Working position effecting the convexity
In the usual distensible member vulcanizing presses,
the distensible member in the extended position has the
rheight of the cylindrical tire band, so that the latter is
, ber is extended into a cylindrical form, the drive of the
supported by the two beads on the lower and upper
press cover being independent of the drive of the upper
of said member into a delivering or receiving position of
the press mould lower half, in which the distensible mem
carrying rings of the distensible member, and so that with 20 carrying ring for the extensible member, the press cover
f‘ the closing of the press, the press cover moves the upper
, is provided with a cylinder attachment for piston-guiding
- carrying ring towards the lower carrying ring, the dis
of the upper carrying ring of the distensible member. The
cylinder attachment opens below in a centering projection,
> tensible member and the tire band surrounding being
bulged.
which on closing of the press, lies in the upper bead ring
In so-called high-shoulder tires, the bead edges of the 25 of the ?at band. Advantageously, the depth of the cylin
?at built-up tire band are constricted or drawn in more
der attachment is such that it is at least equal to the
or less, however, relatively to its cylindrical cover form.
difference between the height of the distensible member
and the width of the cylindrical ?at band. Advan~
, The height of these tire bands is therefore considerably
less than that of the inner sheath. Since, however, the
height of the extended distensible member must corre
30'
tageously, the drive of the press cover is so designed that
its vertical stroke length is greater than the extending
spond at least to the inner sheath height of the tire band,
distance of the distensible member, and in the open end
so that when the press is closed the distensible member
position, the cylinder attachment is fully retracted from
the upper carrying ring.
Due to this construction, after the cylindrical tire.
will be applied with pressure against the inner wall of the
;_ tire, when the tire band is placed over the extended
distensible member, the latter projects more or less from
the tire band.
If, therefore, when rounding out these
‘ high-shoulder tires, the rounding-out process is initiated
, solely by the closing movement of the press cover, there
is a danger that on the ?rst exclusively downward move
band has been placed over the extended distensible mem
ber, the press cover, in the extended position of the
member, can be lowered until the centering projection of
the upper press mould half has been inserted into the
upper bead ring of the tire band. During this part of
ment of the upper carrying ring of the distensible member, 40 the closing movement, the upper carrying ring of the dis~
‘ the portion of the latter projecting beyond the upper edge
tensible member moves upwardly in the cylinder attach
. of the still cylindrical tire band will be pinched between
ment. Then, on continuation of the closing movement
. the upper bead ring of the the band and the upper carry
of the press cover, the upper carrying ring is moved down
ing ring or the press cover pressing the latter down,
wardly in the cylinder attachment, the distensible mem
especially since the press cover, resting on the upper
ber being put under internal pressure at the same time.
carrying ring, prevents the operator from making a close
Due to this intrinsic movement of the upper carrying ring
observation.
relatively to the press cover, which can be e?’ected by
It has therefore also already been proposed to control
loading the upper carrying ring from above by pressure
the in?ation of the distensible member for a ?rst working
medium, or by a downwardly directed pull on the lift rod
\ ‘distance, independently of the closing movement of the
press cover, the distensible member being ?rst drawn in
by a special drive to the height of the tire band, and the
press cover being only then applied to the upper carry
supporting the carrying ring, the distensible member is
forced into the bulging tire on further closing of the press
cover.
At the same time, it slides over a rounded por~
ing ring of the distensible member and determining the
tion on the lower edge of the centering projection. This
construction results in a careful treatment of the dis
subsequent course of the shaping of the tire band. This
construction alfords the possibility of being able to observe
the ?rst part of the downward movement of the upper
tensible member, any pinching during the closing opera
tion being prevented. Furthermore, the drive for the dis
tensible member is constructed in known manner so that
carrying ring of the distensible member in order, in the
the pull rod supporting upper carrying ring is moved
event of any pinching, to be able to counteract any de-s
upwardly with the opening of the press cover for the
fective drawing-in of the distensible member by reversing 60 withdrawal of the distensible member from the com
\ the control. Correct drawing-in of the part of the disten
pleted tire until the member has reached its extended
sible member projecting beyond the tire band into the
position whereupon, while retaining the extended posi
latter, in this construction of the drive, is also dependent
tion of the distensible member, the lower carrying ring
solely on the attentiveness of the operator.
is also raised for lifting the tire out of the lower press
The same problemris encountered in distensible mem
mould half. After the tire has been lifted out, the lower
ber vulcanising presses used for re-treading worn tires or
carrying ring returns to its seat in the lower press mould
vulcanising circularly built-up tires. In this case, the
half, the distensible member beingretained in the ex
tires to be provided with the new vulcanised tread has
tended position. It is, however, also possible to use any
already the ?nal or approximately the ?nal three-dimen
other sequence of the movement of the two carrying rings
sional form. The tire can therefore be placed over the 70 in the opening of the press, which will result in the with
distensible member only when the latter has been ex
drawal of the distensible member from the tire and the
tended, in which case, it is necessary to take precautions '
ejection of the latter from the lower press mould half.
3,071,811
If desired, the lower carrying ring may be fast in the
A
press mould half 4 has on the internal diameter a down
lower press mould half, in which case the completed tire
is detached by hand from the lower press mould half
and lifted over the extended distensible member.
The new press construction may also be used to ad
is so dimensioned that on the downward movement of the
press cover 3 with the upper press mould half 4, at the
a)
wardly projecting annular nose 16. The height of the
cylinder attachment 15 extended by the annular nose 16
commencement of the axial movement relatively to the
lower press mould half 2, the curved inlet surface 17 of
the annular nose 16 engages the upper carrying ring 7, and
the ?nal form. In order, however, in this mode of ap
the cylinder attachment 15 then descends relatively to the
plication, to shorten the opening distance of the press
cover—-the press cover must of course be opened so far 10 upper carrying ring 7. Finally, the annular nose 16 is in
serted into the upper bead’ring 12. In the inserted end
as to release the extended distensible member for lifting
position, in which the shoulder 18 rests on the upper bead
off the tire—it is then advantageous for the lower carry
vantage for vulcanizing re-treated or circularly built-up
tires, in which the tire is already available in substantially
ing ring, loosely inserted in the lower press mould half,
ring 12, the upper carrying ring 7 is given an intrinsic
to be carried by a lift rod, which is received by an exten
downward movement relatively to the press cover 3 con
sure medium.
wardly by a drive then to be switched on.
press cover 3 carrying the upper press mould half 4. The
the upper press mould half 4.
sion of the cylinder attachment, while the upper carrying 15 tinuing the closing movement and the cylinder attach
ment 15, for example by the lift rod 8 being drawn down
ring is slidable on the lift rod and is acted upon by a pres
At the same
time, the distensible member 6 is put under internal ex
Thus, with the opening of the press cover, the lower
cess pressure. With the resulting distension of the mem
carrying ring is lifted out of the lower press mould half,
so that the tire can be lifted off laterally below said ring. 20 ber 6, the latter moves over the curved surface 17 into
the annular space de?ned by the tire tread 11 and pinch
The total stroke travel of the press cover is then sub
ing of the member 6 between the upper tire ring 12 and
stantially only half the width of the completed tire plus
the upper press mould half 4 is prevented with certainty.
the amount by which the lower carrying ring projects
The same problem is encountered in the vulcanisation
beyond the underside of the press cover.
The new construction is explained more fully here 25 of repaired or circularly built-up tires in expansible bag
presses, since the tire to be provided with the new tread
inafter with further features, with reference to the draw
and to be vulcanised has already the ?nal or approxi
ing showing, in axial section in each case, in
mately the ?nal tire form. It is here a matter of delay
FIG. 1 the application of the invention in a vulcaniz
ing the bulging of the member 6 until the upper press
ing press for the manufacture of ?at build-up high
mould half 4 rests on the tire 11a, i.e. the press is already
shoulder tires and
closed.
FIG. 2 the application of the invention for the repair
FIG. 2 shows a distensible member vulcanizing press
of worn tires or the vulcanization of circularly built-up
for
vulcanizing repaired or circularly built-up tires. Here
tires.
again, the press table 1 receives the lower press half 2,
In the construction according to FIG. 1, the press com
prises a lower stationary press table 1, with lower press 35 while the press cover 3, adapted to be swung in relatively
to the press table and to be lifted off the latter, carries
mould half 2 mounted rigidly thereon, and an upper
The upper press mould
half 4 has a downwardly extending internal nose ring
16, which with the cylinder attachment 15a of the press
opening of the press, the press cover is lifted axially rel
atively to the lower press mould half and is then swung 40 cover 3, forms a cylinder in which the upper carrying
ring 7 is guided as a piston.
away to the rear, while in the closing operation, the two
The upper carrying ring 7, however, is slidably carried
part movements of the press cover take place in the re;
by a piston rod 8a, to the lower end of which is ?xed
verse sequence.
the carrying ring 5. The piston rod 8 carries on its upper
The lower press mould‘ half 2 receives in central ar
rangement a lower carrying ring 5 for a distensible mem 45 end a piston 26, which is guided in a further cylinder 21
mounted on the cover 19 of the cylinder 15a, and is
ber 6, the upper edge of which is clamped in an upper
loaded by a spring 22. The cylinder 21 can be con
carrying ring 7. The upper carrying ring 7 is carried
nected to a source of compressed gas by means of a pipe
by a piston rod 8, adapted to be shifted- by a pressure
line
26 opening below the piston 20, so that therefore
medium drive, not shown.
the piston 20 can be moved upwardly in the cylinder 21
The lower carrying ring 5 is provided with a supporting
under the effect of the compressed gas against the action
shoulder 9 for the lower bead edge 10 of the ?at tire band
of the spring 22.
11. In these high shoulder tires, the internal diameter
The height of the cylinder 15a is so dimensioned that
of the flat band 11 is much greater than the internal difm
the extended member 6 can be accommodated therein.
eter of the two tire beads 10, 12. Consequently, the de
velopment length of the height of the inner wall of the 55 The height of the cylinder 21 is selected so that in the
construction is also devised in known manner so that on
?at band from one bead toe 13 to the other bead toe 14
is also much greater than the overall height of the ?at
band 11.
Since the distensible member 6 in the extended position
must at least have a height corresponding to the develcp 60
ment length from one bead toe 13 to the other bead toe
14, it projects beyond the ?at band by a considerable
amount in the extended position.
In the closing opera
extended position of the member 6, the piston rod 8a
with the lower carrying ring 5 can be lifted out of its seat
in the lower press mould half, the extended position of
the member 6 being retained. The cylinder cover 19 is
also provided with a hole 23 for the connection of a
compressed air and suction pipe 24.
FIG. 2 shows the press in the closed position. For
opening the press, the compressed air pipe 24 is con
nected to a source of suction, the steam pressure in the
tion of an ordinary press, the upper press cover 3 with
the upper press mould half 4 already rests on the upper 65 bag 6 being removed, so that the upper carrying ring 7
carrying ring 7 when the upper press mould half 4 does
not yet bear on the upper bead ring 12, and on the fur
is drawn upwardly in the cylinder 15a, and the member 6
is extended and withdrawn from the tire.
As soon as
the member 6 has reached the extended position, the
drive for the lifting movement of the press cover 3 is
with reduction in the distance between the two carrying
rings 5, 7, will already be convexed, and there is a danger 70 started. Due to this lifting movement, the piston rod 8a
and the lower carrying ring 5 are also moved upwardly,
of the said member being pinched between the upper press
so that the latter is lifted out of its seat in the lower press
mould half 4 and the upper bead ring 12.
mould half.
According to the invention, the press cover 3 is pro
I claim:
vided with a cylindrical attachment 15, in which the upper
1. In a tire vulcanizing press, a laterally distensible
carrying ring 7 is guided slidably as a piston. The upper 75
ther closing operation, however, the distensible member
5
3,071,811
6
vertical axis tubular member operating by side expan
half ?xedly carries a downwardly open cylinder for guid
ing the said carrier ring and tubular member, an axial
piston rod passing through and beyond the ends of the
cylinder, the said ring being fixed to a piston, the piston
being slidable with respect to both the cylinder and piston
sion and contraction in conjunction with tire carcass
forming molds, including a stationary lower mold half
and a coaxial vertically movable upper half mold, an
annular nose ?xed on and depending from the upper
mold half and projecting below the contiguous mold sur
face and presenting, in radial vertical cross section, a
rod, a conduit leading from the top of the cylinder to a
source of suction and compressed air to raise and lower
radially outer straight tire bead abutting surface of the
the piston and its connected structures, the lowermost end
same height dimension as the inner width dimension of
a tire bead, said nose further characterized by a radially
of the piston ?xedly carrying a disc with a second carrier
ring, the latter ring ?xedly carrying the bottom of the
inner upwardly curved surface whose lowest part is hori
tubular member, and being seated on the lower mold half
zontal and which curves evenly therefrom until it merges
vertically with the inner face of the upper mold half, a
vertically movable coaxial ring carrying the top end of
the tubular member, said ring being movable with respect
to and always remaining above the nose, the nose thus
when in its lowest position, the piston rod being provided
at its top with compressible means to bias it and the second
carrier ring downwards with respect to the cylinder to
15 gently seat the latter ring,'and ?uid pressure means to
presenting a smooth upper and outer annular surface to
engage with the tubular member as it stretches and moves
bias the rod and the second carrier ring upwards with
respect to the cylinder to aid in unseating the second ring
from the lower mold, and means to admit and exhaust a
therepast, whereby when ?uid pressure is applied within
heated ?uid to and from the interior of the distensible
the tubular member causing it to expand sidewardly, 20 tubular member.
and when ?uid pressure is released from within the tubu~
lar member and the ring is moved upwardly causing the
References Cited in the ?le of this patent
member to contract sidewardly, the tubular member is
guided smoothly respectively out and in over the curved
mold face and the contiguous lower inner surface of the 25
UNITED STATES PATENTS
2,741,799
Heston ______________ __ Apr. 17, 1956
215,704
Australia ____________ ____ Apr. 14, 1958
bead, and pinching of the member is prevented, even
upon the closing of the molds.
g. The structure of claim 1, wherein the upper mold
FOREIGN PATENTS
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