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Патент USA US2410312

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OctvZQ, 1946,
A
H. A. STORCH
v
MOLDING.
' ¿2,410,312
APPARATUS
Filed Jul'y 15, 1944V
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INVENTOR.
f/ßßœß- A’. 570/90/
M' ILM
' >` ,50% @Wm
„Trae/v5 Ys
2,410,312
Patented Oct. 29, ~1946
UNITED-STATES PATENT* OFFICE
Harold A. Storch, Fairview Village, Ohio
Application July 15, 1944. Serial No. 545,114
5 Claims. (Cl. 18-9)
2
l
This invention relates to the molding of arti
cles from plastic material or materials in a plas
tic state and aims to provide a novel apparatus by
which molded articles, and particularly articles _
of revolution, can be rapidly and -economically '
'
I,
grooves of the cooperating mold members .and>
the mold recess formed by such grooves.> »
. '
Proceeding with a more detailed description of
Another object of this invention is to provide a
the invention and referring to the particular
embodiment illustrated'in the drawing, I show
molding apparatus I0 comprising a pair of
cooperating stationary and movable mold mem
novel moldingv apparatus of this character,
is in the form of a ring which 'provides a frame
produced.
.
l
involving the use of a grooved moldmember and
bers II and I2. The stationary mold member II
for the apparatus and has a substantially circu
the step4 of rolling a ` body` of material in the 10
lar central opening I3 therein. " The movable
groove for molding the material to article form.
A further object'of the invention is to provide
novel molding apparatus of the character men
mold member I2 is in the form of a drum which
is located in the circular opening I3 of the sta
tionary
member II and is mounted forrotation
tioned, in which complemental grooves of a pair
as will be presently described. The ring member
of mold members forma mold recess of a cross 15 II is provided with oppositely extending projec
'sectional shape to correspond substantially with
tions I4 by which it may be mounted on a suit
the profile ofthearticle to be produced and such
able support or foundation I5. ‘The ring mem'
mold members are relatively movable inthe
ber is of a hollow construction so as to provide
direction of the grooves for rolling plastic mate
therein a passage or chamber I6 for a curing.` or
rial to article shape and advancing the article 20 treating medium which usually will be a heating
along the recess.
‘
medium, such as steam, although it can be a
Still another object of the present invention is
to provide novel molding apparatus of the char
acterrreferred to, having means for severing bod
cooling medium depending uponthe requirements
ofthe material `being molded. Usually the mate
rial , will be a non-metallic material . such as
ies or blanks from plastic stock in strip form pre 25 rubber or a rubber compositionzwhich is cured by
liminary to the molding operation and means for
heat and the medium will therefore be referred
trimming the articles at or near the end of the
to as a heating medium. . Such heating medium
molding operation.
can be circulated through the-` passageL I6 by
Yet another object of this invention is to pro
means of supply and exhaust pipes or conduits
vide novel molding apparatus of‘this character,
I1 and I8 which are connected with such passage
in which the mold comprises relatively rotatable
through the oppositely extending projectionsxl?l‘;
ring and drum members and is heated or cooled
so as to effect a curing of the material during the
molding thereof.
The invention can be further briefly summar
ized as consisting in certain novel combinations
‘ The drum constituting the movable mold mem
ber I2 has a pair of oppositely extending co-axial
. projections or shafts 20 and 2I 'thereon and which
are journaled in suitablebearings‘22 and 23 so as
to mount the drum for rotation about the com
mon axis of the shafts"2û and 2|. The bearings
22 and 23 are located on opposite sides of the
and arrangements of parts, hereinafter described
and particularly set out in the appended claims.
In the accompanying sheet of drawings,
Fig. 1 is a side elevation of molding appara
tus embodying the present invention.
'
Fig. 2 is a vertical sectional view taken through
the apparatus as indicated by line 2-2 of Fig. 1.
Fig. 3 is a Partial sectional view showing the
feed opening and the severing means for the strip
stock, the view being taken on line 3-3 of Fig. l.
Fig. 4 is a _partial sectional view showing the
40
stationary mold member Il and >may be suitably
mounted on the support or foundation I5.
The -
drum I2 is also of a hollow construction so as to
provide therein a recess or chamber 24 to which
some of the above-mentioned curing or heating
medium can be supplied. The shafts 20 and 2I
are hollow and .provide supplyand` discharge pas
sages which communicate with the chamber 24
and into which supply and discharge vpipes or
conduits 25 and 26 for the curing medium extend,
means for trimming the molded articles, the view
being taken on line 4-4 of Fig. 1.
_
50 as shown in Figs. land 2 of the drawing. The
drum I2 can be rotated by supplying torque
Fig. 5 vis a partial bottom plan view showing
thereto through the shaft 2| and this can be
the discharge opening for the molded articles,
accomplished manually or by the use of any
and
»
suitable power means connected therewith as lby
Fig. V6 is a partial transverse sectional view on
an enlarged scale showing the‘ complemental 55 means of the pulley 21 and the driving belt 28.
2,410,312
3
.
The present invention involves the use of a
mold recess or chamber 33 of a cross-sectional
shape corresponding substantially with the pro
ñle of the article to be produced.
The mold
chamber 3D is formed by cooperating comple
mental mold grooves 3l and 32 formed respec
tively in the adjacent zzo-extending faces of the
stationary and movable mold members H and
I2. The molding apparatus herein disclosed can
be used in producing a number of'different ar
ticles from rubber or rubber-like material or
from any other moldable plastic material. In
this instance and merely by way of example, the
4
member Il and can be normally held in a lifted
condition by a torsion spring 42 so as to permit
the insertion of the leading end 0f the strip 39
into the feed opening. The cutter 40 can be ac
tuated by any appropriate means such as by a
pin 43 projecting from the mold member l2 and
engageable with the cutter during the rotational
movement of this mold member. The cutter can,
of course, be omitted and previously cut or pre
pared lengths of stock canv be inserted> in suc
cession throughithe feed opening 38'.
'
In the operation of the apparatus herein dis
"closed, the blanks 39a which are severed from
method and apparatus are being usedgformthe
the leading end of the strip of stock 39 are sub
production of small button-like rubber articles
jected to a rolling operation in the mold cham
33 which are commonly called bumpers and are ber `3i] by the rotation of the drum I2 in the
used in large quantities in automobile body- work ring. member .,ll. During such relative move
for preventing metal-to-metal contact between
ment between the movable and stationary mold
various parts of the vehicle.
"
members each blank or body of stock is rolled
As shown in the drawing, the bumpers 33 are 20 and kneaded in the mold chamber 33 and is sub
rivet-like-> articles having a rounded head> 33a
jected> to pressure therein causing the. material
and a tapered stem or shoulder portionf33b', with
to be _distributed into and substantially 13.11 .the
a locking Vgroove‘33c located between suchfhead
complemental grooves ofk the'mold chamberat
and‘tapered stem. The bumper 33 also includes
the particularlocation of the blank `in such cham
a tail 33d of relatively> reduced size which eX 25 ber. Since the materialis being` rolled along the
tends` from the’ tapered stem 331). As is under
mold recess it asstunes and retains a round or
stood by those skilled in automobile-body work,
these bumpers are mounted in openings» of :sheet
cylindrical shape, that is-to »,say, it becomesA an
article of revolution having aproñle correspondf
metal parts- by inserting the tail 33d through
inggwith the. shape -orpronle defined by the com
the opening and pulling' the tapered stem 33h 30 plemental grooves. .The kneading andr working
into or through the openingmup tothe point of
to which the >material issubjected causes such
the locking groove 33e. The edge of the sheet
material to be ñrmly compacted which renders
metal body surrounding the opening engages in
the article dense and strongy and vexpels air bub..
thellockingV groove 33c'to'retain the bumperin
bles therefrom which wouldvotherwise make the
position wíththe head> 33a' thereof formingl an 35 article porous and weak. rIfhe resulting article
insulating body’and bumper element.
produced by the molding operation is of a homo
The'grooves 3|-and 32'infthe adjacent faces of
'geneous nature and is> ofA a strongl‘and durable
the stationary and movable mold members II
character usually having-fa high tensile strength.
and I2 are‘of ka shape'ior contour corresponding
'I’he mold can beheatedor cooled tothe desired
with the shape or proñle of the article 33 to be
extent during the molding operation, by supply
produced, that is to say, each of these grooves
ing appropriate medium to the passages of the
includes a section correspondingwith the round
mold members >II and I2.as above explained,- so
ed headw33a, a section corresponding with the
as to` obtain adesired curing, hardening or other
taper stem`33b>and a section corresponding with
treatment of. the stock being worked. The extent
the tail 33d. The mold members> are construct- i to which the mold is heated orcooled- during
ed and'arranged so that -.thegrooved faces4 there
_the molding operation will dependen the require
of operate- in relativelyV close relation to each
ments and characteristics of the particularplastic
other and form the annularly extending »mold
material being used and the characteristics de
chamber‘îitl.> "It is-necessary that there be some
sired in thearticles being produced.
clearancel between themovable andV stationary
As the» molding operation progresses during the
mold members such as the annularly extending
rotationof the drum I2 within-the ring. member
clearance spaces 32!V and 35 shown in the draw
I I the articles 33 travel aroundrthefmold recess
ing but which may vary in width according to
33 in a direction away from .the »feed opening
the requirementsïof the particular molding ap
and toward the discharge opening 3l or, inrother
paratus being used or material. being molded.
words, advance along `vthe moldïrecess ina clock
The lower portion> of the stationary mold mem
wise direction as seeinA in Fig. l. The pressurel to
ber H is of a relatively wider construction than
whichthe stock. is subjected duringethe mold
the-upper portion thereof as> can be readily seen
from Fig. 2 of the drawing. ' This relatively
Wider construction for the lower portion of this 60
mold member enables the same to be provided
with a discharge opening 3l through which the
molded articles can drop by gravity from the ap
paratus. At a point adjacent the discharge open
ing.' 31', the stationary mold member II is alsol provided with. a feed opening 38r leading int-o the
annular mold chamber 30 and through which
theleading end of a strip or stream 39 of rubber
or other suitable plastic stock can be inserted.
' .Sections
or
blanks
having
an
appropriate 70
I length and‘volume‘of material, such as the blank
39ashown in Fig. 3 can besevered from the lead
ing end of the strip 39 as by means Yof a cutter
40. Such a cutter canibe pivotally‘mounted on
a projection> or boss 4| of the stationary mold
ing operation causes any excess material to .be
squeezed :from the mold recess as flash45 through
the clearance spaces 34 and 35. Since the articles
being formed are articlesv of revolutionv the flash
45 is usually in the form of threads orY strings
of plastic material- extending from the _headl and
tail of the article being formed, as shown in Figs.
It is desirable tol trim the iiash 45 from the
articles 33 and in accordance with the present
invention such trimming is accomplished before
thearticles arrive at ythe discharge opening' 3l.
For this purpose I' provide the »apparatus'with
a trimming means comprising a pairl of'trim'ming
rolls 46 and 41 which are rotatably mounted on
the stationary mold member Il just ahead ofi the
discharge opening 31,. These trimming rollsfhave
peripheral cutting edges which cooperate lwith
aiiioßïa
the
drum
so »as ` to severl the .dash portiorisltâ`
e'I
means on said drum member and engageabîle‘v with.
from. the articles asfthe >articles pass between the
said cutter' for producing said strip-cutting move
ment, and a ,trimming means rotatably mounted
onÍsaid' ring V'member adjacent said discharge
mentiof their cuttingportions thè’rzrevvith.V _
opening and having a cutting portion engaging
said drum memberfor trimming the‘molded ar
drum and the trimming rolls. ' The trimming
rolls are driven. by the drum l2 `by the engage->
,
»In the event that any of the articles 33 tend
to adhere to the surface of the drum 12 at the
endfof the-molding operation theyl can >be dis-A
tioles as they approach the discharge opening. ,_
v2. In apparatus for molding plastic material, `a
ring member having a circumferential groove
lodged therefrom by means of a stripper 49 pro 10 therein, a drum member rotatable in said ring
vided in the discharge opening 31. This stripper
member and also having a circumferential> groove
unaybea finger-like member mounted on the
therein, the> grooves of said ring and Vdrum mem
stationary mold member I_l so as to extend into'
bers cooperating to define a circumferentially ex
adjacentrelation‘to the surface `of the movable . tending mold chamberof
_
`
a cross-sectional shape
mold member Il for scraping or pushing the
corresponding ‘substantially with the proñle of the'
molded articles from the latter should this be
. article to be produced, said ring member having a
necessary to cause such articles to drop freely
feed opening communicating with said chamber
through the discharge opening 31.
at one point thereof for introducing said material
The extent to which the material is subjected
in strip form and having a discharge opening
to compression during the molding operation will
communicating with said chamber at another
20
depend upon the characteristics of the material
point thereof for the delivery of the molded ar
being Worked and the requirements of the articles
ticles, means for rotating said drum member for
being produced. In some cases, the pressure
rolling a body of said material in said chamber to
applied will be only sufficient to cause the mate
shape the body to article form and advance the
rial to be properly distributed in the mold recess
same toward said discharge opening, a pivoted
25
to fill out the profile of the article being formed.
cutter adjacent to and movable transversely of
In other cases, additional pressure may be neces
said feed opening for severing a body of said ma
sary to obtain the desired characteristics or qual
terial from a strip being fed, a spring acting on
ities in the articles. Any desired amount of
said cutter for moving the same in a direction to
pressure can be obtained by imparting an appro
uncover said feed opening, and projecting means
priate taper to the groove of the stationary mold 30 on said drum member and engageable with said
member Il such that the depth of the groove de
cutter during rotation of the drum member for
creases progressively and subjects the article to
moving the cutter in a direction to sever the strip.
increased pressure as theY article is rolled and
3. In apparatus for molding plastic material, a
advanced along the mold recess 30.
35 ring member having a circumferential groove
From the foregoing description and accom
therein, a drum member rotatable in said ring
panying drawing it Will now be readily understood
member and also having a circumferential groove
that I have provided an improved apparatus for
therein, the grooves of said ring and drum mem
bers cooperating to define a circumferentially ex
rapidly and economically producing molded arti
cles from plastic stock.
.
l
40 tending mold chamber of a cross-sectional shape
corresponding substantially with the profile of
While I have illustrated and described my
the article to be produced, said ring member hav
molding apparatus in considerable detail, it will
ing a feed opening communicating with said
be understood, of course, that I do not Wish to
chamber at one point thereof for introducing said
be correspondingly limited but regard my inven
material and having a discharge opening com
tion as including all changes and modifications
municating with said chamber at another point
coming within the spirit of the invention and the
thereof for the delivery of the molded articles,
scope of tbe appended claims.
means for rotating said drum member for rolling
I-Iaving thus described my invention I claim:
a body of said material in said chamber to shape
1. In apparatus for molding from plastic ma
the body to article form and advance the same
terial elongated articles of revolution of the kind
toward said discharge opening, said drum and
having a body which includes stem and shoulder
portions, a ring member having a circumferen
tial groove therein, a drum member rotatable in
said ring member and also having a circumferen
ring members having cooperating portions defin
ing a clearance space which communicates with
said mold chamber, and trimming means rotat
ably mounted on said ring member and having a
tial groove therein, the grooves of said ring and 55
cutting portion engaging said drum member ad
drum members cooperating to define a circumfer
jacent said discharge opening for trimming from
entially extending mold chamber having a cross
the molded articles excess material which is dis
sectional shape Which is elongated transversely of
placed through said clearance space.
the groove and corresponds substantially With
4. In apparatus for molding plastic material,
the profile of the article to be produced, and said 60
a ring member having a circumferential groove
grooves having connected coextending portions
therein, a drum member rotatable in said ring
of diiferent depths spaced transversely of the
member and also having a circumferential groove
grooves for forming the stem and shoulder por
therein, the grooves of said ring and drum mem
tions of the articles means for rotating said drum
member for rolling a body of said material in said 65 bers cooperating to define a circumferentially ex
tending mold chamber of a cross-sectional shape
chamber to shape the body to article form, said
corresponding substantially with the profile of the
ring member having a feed opening disposed lat
article to be produced, said ring member having
erally of its groove and extending in the direction
a feed opening communicating with said chamber
of the axis of the drum and communicating with
at one point thereof for introducing said material
said chamber at one point thereof for introducing
in strip form and having a discharge opening
said material in strip form and said ring also hav
ing a discharge opening communicating vvith said
communicating with said chamber at another
chamber at another point thereof for the deliv
point thereof for the delivery of the molded ar
ery of the molded articles, a cutter pivotally
ticles, means for rotating said drum member for
mounted on said ring member for strip-cutting 75 rolling a body of said material in said chamber
movement transversely of said feed opening,
8
n to‘shape the body to article form and advance
chamber at one point thereof for introducing said
material in strip form and having a‘discharge
opening communicating with said chamber at
movalolyv mounted on said> ring member adjacent
said lfeed `opening for severing bodies of material
in` succession from a strip being fed, and means
on saiddrum for actuating saidcutter.
5. In apparatus for molding plastic material, a
ringA member having a circumferential groove
another point thereof lfor vthe delivery of the
molded articles, means for rotating said drum
member for rolling a body of said material in
said chamber to shape the body to article form
therein, a drum member rotatable in said ring
member .and also having a circumferential groove
therein, the grooves of said ring and drum mem
.
havinga Afeed opening communicating Withsaid
the same towardsaid discharge opening, a> cutter7
19
bers cooperating to define a, circumferentially
extending mold chamber of a cross-sectional
shape corresponding substantially with the proñle
of the article to. be produced, said ring member la
and advance> the same toward said discharge
opening, and trimming rolls mounted on Ysaid
ring member and cooperating with said drum for
trimming the molded articles as they approach
said discharge opening.
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HAROLD A. s'roRcH.
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