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Патент USA US2132819

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Oct. 11, 1938.v
Filed July 13, 1935
' m“
2 Sheets-Sheet 1
Oct. 11, 1938-.
Filed July 15, 1935
2 Shéets—Sheet 2
Patented Oct. 11, 1938
2,132,819‘ ,
I, ' Park P. Crisp, Stow, and‘, William
Akron, Ohio, assignorsi vto The Firestone vTire
& Rubber Company, Akron,_(?)'hhii_o, a corporation '
I App?m?m‘ Juli 13. 1535, serial to‘. 21,226 '
This invention relates to methods‘ of and
apparatus for the manufacture of rubber goods
that are generally of strip form and have longi
tioning the‘ latter on the support.» The cap
screws I2 extend‘through respective slotsl3 that
are .disposedftransve'rsely in the gauge plate,
tudinal and transverse curvature, and-more es
the ‘arrangement ‘being such that said gauge
5 pecially it relates to improved‘ vprocedure and plate maygbe adjusted. laterally to accommodate 5
improvedrapparatusfor the manufacture-of rub :the workf-support to work of various widths.
ber fenders for motor vehicles.
. .
As-shownin Figure1 2, the structure I!) describes
v‘The chief objects of theinvention are to pro
--an arc of substantially 180° and has slightly
vide an improved »method .for the expeditious “diverging extensions atits respective ends. It
10 vulcanization of rubber fenders for motor cars;
is laterallyreinforced by a plurality of integral »10
and to provide improved and simpli?ed apparatus J’radial ‘and-transverse ribsIOa, Illa. '
for ‘the practice of the improved method. More
Work mounted upon thesupport I0 is secured
fspeci?callythe invention aims to e?ect the vul
thereto. at its respective end portions, and to
canization of articles of the character mentioned this end arcuate clamps I5 are positioned at
.15 in open heat, without the use of molds.‘ Econo
‘the extensions atithe respective ends of the arcu- .15
mics of time, labor,v and. equipmenti'also are ate Istructure ID.. Each clamp .is pivotally
contemplated. Other objects will be manifest. .mountedat one .of its endsupon a rod I6 that
Of the accompanyingdrawings:
._ ;_
is supported between a pair of brackets I1, I‘!
uJFigure 1 is a side elevation of a'complete ap-‘ that are secured to a flange lob that extends
~40 paratus for use in-concurrently vulcanizing a ' inwardly from that margin of the structure upon 20
plurality of. rubber fenders; ,
.‘which gaugefplate II is mounted. The clamp is
Figure 2 is a plan' view. of one of the‘forms 1 constructed and arranged to transverse the work
upon which a work-unit is mounted during vul
lsupporting surface of the support, and has its
canization, and the work thereon; M a . :
free end slotted at I8, Figures 5 and 4, to re
*25i Figure 3 is a perspective view of a work-unit 1 ceive ailatch-bolt I9 that is pivotally mounted 25
as it appears before being mounted upon a
upon. a rod-20 that is supported between two
vulcanizing form;
, .
brackets 2|, 2|. The latter are formed integral
Figure 4 is a section on the line 4—-4 of Figure with the .structure I0 on the inner periphery of
the transversely arcuate marginal ‘portion there
Figure 5 is an end view- of the structureshown ‘of. WA, spring-pressed keeper 22 is ; mounted on 30
in Figure 4, on a larger scale, as viewed- from . therfree. end of the latch-bolt and is adapted
tor'engage withgthe clamp to retain the latch
bolt within the slot I8 therein. The clamps I5
and latch-bolts I9 are slidable longitudinally of
their respective pivot rods I6 and. 20 to the end 35
that said clamps and latch-bolts may be posi
gins; and
wtioned' at ldi?erent points so as to accommodate
Figure 7 is a view similar to Figure 6 showing work of various lengths. Each clamp, I5 has-a
the work as it appears at the completion of the
longitudinal series ‘of pins 23, 23 projecting from
40 vulcanizing operation.
its concave face for the purpose of impaling the 40
Referring to the drawings, I0 designates a form end portions of the Work and holding the latter
Figure 6 is :a transverse section through the
medialv region ‘of a ‘vulcanizing form, vandf'the
35 work thereon, as they appear whenv in position
for vulcanization, but before vulcanization be
or work support upon which the work is se
cured and supported during vulcanization. Said
work-supporting form comprises a longitudinally
45 arcuate structure upon the outer peripheral face
of which the work may be mounted, said arcuate
structure also being transversely arcuate in a
region of substantial width along one lateral
margin thereof. A removable, arcuate, longi
50 tudinally extending gauge plate II is secured
?rmly to the support.
The work, designated 25, is shown in its ini
tial form in Figure 3. It consists of an elongate
strip or slab of .unvulcanized rubber composition 45
that may be formed in a continuous length, as
by an extruding machine, and thereafter cut into
individual units of the desired length. As shown,
the work-unit is formed with one square longi
tudinal margin and one rounded or beaded longi- 50
to the work-supporting face of structure It], by
tudinal margin, and a longitudinally extending
means of cap screws I2, along the margin there
rib 25a on one face thereof, but it will be under
stood that these oharacteristics of the work may
be varied without in any way affecting the in
of that is opposite said transversely arcuate mar
gin, said plate constituting a guide against which
55 a margin of the work abuts for properly posi
vulcanization of the work is effected in open
heat in a horizontal vulcanizer (not' shown) of
usual construction while the supporting form l0‘
with the work thereon is disposed in determinate
angular or inclined position with relation to the
horizontal. To this end a carriage 21 is pro
vided, which carriage carries a plurality of sup
porting frames 28, v28 that support respective
forms It at an angle'of 30°~35° tothe horizontal,
the medial, arcuate portion of each form being
uppermost. This arrangement of the forms 10 is
an important feature in e?ecting the vulcaniza
tion of the work, and it also permits an overlap
ping arrangement of the forms whereby economy
15 of space is obtained.
The carriage 21 .may be
provided with ?anged wheels 29, 29 to permit it
readily to be moved into and out of a vulcanizer
that is provided with suitable track-rails, .and ‘a
wheeled truck 30 may be provided for conveying
20 the carriage 21 to and from the vulcanizer.
The methodof practicing the‘invention with
.the previously describedapparatus isas follows:
An unvulcanized work-unit 25 is placed upon a
supporting form LB with itslsquare margin abut
25 ting vthe vedge .of gauge-plate :_l l, assuming the
position shown in broken lines in Figure ,6. The
work-unit is then stretched longitudinally about
.theiorm, each way fromitsmiddle, and its end
portions secured in place by means of the re
spective clamps :15. The stretching of the work
unit elongates it aboutthreeinches at each‘end,
and .places the entire unit. underwlongitudinalr
‘tension, with the result that the unsupported
marginal portion of the unit, about the trans
35 versely arcuate marginal portion of .the form,
is constricted and drawn toward. said arcuate
.portionof the formvas is clearly shown in iull
lines in Figure 6.
The form It! with the work 25 thereon is then
40 .mounted .upon the carriage 12.1, in the inclined
position shown'zin Figure 1, andthe‘latter moved
‘into a vulcanizer where the .work is subjected
to open, vulcanizing .heat. During the initial
phase of .the (.vulcanizing operation, :the rubber
composition ‘of the vwork softens, and,‘because of
the :force of .gravity .and the tension previously
imparted to;the,work, theiunsupported marginal
vention achieves the other objects set forth in
the foregoing statement of objects. The work
requires but little treatment after vulcanization
to make it ready for use, and there are no over
flow rands to be removed as is the case with
articles vulcanized in cavity molds;
' Modification may be resorted to without de
parting from the spirit of the invention or the
scope of the appended claims, which are not
limited wholly to the speci?c construction shown 1O
or exact procedure described.
"What is claimed is:
1. In apparatus for making rubber articles, the
combinationiof a work support, means for mount
ing ,an unvulcanized rubber article thereon un 15
der tension that is parallel to two opposite mar
gins thereof of which one of said margins rests
upon said support and the other is in spaced re
lation thereto, and means for supporting said
work support in.a position such that the nu“ 20
supportedmarginal portion of the article is urged
towardsaid supportby gravity.
v2. zInapparatus vfor making rubber articles, the
combination of a form that is curved longitudi
nally to ,describean arc of not more than 180°,
and has one ‘lateral marginal portion that is ar
cuate transversely so-asato present a convex sur
faceto the outer‘face of the :form, and clamping
,means .at the respective ends of the form ‘for
,engaging the respective ends .of work thereon.
3. A combination as de?ned in claim 2 in
cluding anadju'stable gauge-plate mounted upon
and coextensive with the lateral marginal por
‘tion that is not transversely arcuate.
.4. In apparatus for making-rubber articles, the 35
combination of a ‘work-supporting .form that is
generally arcuate longitudinally, one lateral mar
ginal portion' of ‘the .form ‘being convex on its
outer periphery, a laterally adjustable gauge
plate on the outer periphery of the other mar
ginal portion of theiorm, and means atthe re
spectiveends of the form for anchoring the work
to the outerperiphery of the form.
5. A combination as'de?ned in claim .4 includ
ing [means for adjusting the work-anchoring
means longitudinally of the .form.
6. In apparatus for making rubber articles, the
combination of a longitudinally arcuate work
support that is of irregular transverse shapeso
portion of the vlatter'is drawn inwardly .untilpit
rests upon the transversely arcuate portion of
the form, as .shown in Figure '7. Invthis position that a .flat strip of material thereon will stand
of thework-the vulcanizationthereof is completed in spaced‘ relation‘ to a portion .of ‘the support,
so that .it .is'permanently shaped
conformity anchoring means at the respective .ends vof the
with the longitudinal and transverse curvature support‘ for maintaining an article in tensioned
of ‘the 'form. After vulcanization the work is condition upon theouterperimeter of said sup
..port, and means ,for positioning the support in
or U! removed from the form, washed, and its ends
oblique position with relation to the horizontal.
trimmed ‘ to - giveit proper length.
The improved method is practiced with the
relatively simple apparatusdescribedand thein
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