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Патент USA US2404989

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Jilly 30, 1946.
Filéd June 25, 1944
5 Sheets-Sheet 1
July 30, 1946.
Filed June 25, 1944
(D A)
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:5 Sheets-Sheet 2~
. July 30, 19476.,
Filed June 23, 1944
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' 3 Sheets-Sheet 5
Patented July 30, 1946
Paul Schmid, Jamaica, and Henry Hylton, Brook
lyn, N. Y., assignors to Acme Air Appliance 00.,
Inc., Brooklyn, N. Y., a corporation of New York
Application June 23, 1944, Serial No. 541,710
4 Claims.
(01. 18-18)
The present invention appertains to vulcaniz
ers of the type disclosed in Patent No. 2,290,106,
granted July 14, 1942, to W. H. Longstreet, which
vulcanizers are primarily adapted for use in vul
canizing rubber valve stems to inner tubes of
with a continuous, circular and level heater sup
porting surface, with which the heater unit, usu
ally of circular form, is in contact all the Way
around the heater, the heater unit itself being
provided with hold-down bosses of ample size
pneumatic tires and the like.
As shown in the prior patent above referred to,
to withstand the clamping strains imposed by the
vulcanizers of this class usually include a base
or frame on which a heater unit, preferably elec
frame by means of a minimum of hold-down
trically operated, is mounted and against the 10
heating surface of which the inner tube and valve
stem are firmly clamped by an adjustable pres
sure platen to hold the valve stem and inner tube
in cooperative relation during the vulcanizing op
eration. The heater unit and the base or frame
?rm attachment of the heater unit to the base or
screws or equivalent fastening instrumentalities.
Another important object of this invention is
to provide an ef?cient and economical heater unit
in which all parts of the heater assembly are com
pletely enclosed within a housing or casing, and
which may be sealed to make the heater unit
Another object of the invention is to provide
of the vulcanizer are respectively provided with
an improved heater unit assemb1y, all parts of
aligned openings in which the shank of the valve
which are readily accessible for purposes of re
stem is received in arranging the valve stem in
pair or replacement if any part should become
the usual inverted position, with its ?anged base
resting upon the heating surface at the upper side 20 defective after long use, thereby minimizing the
labor and cost attending such repair, and elim
of the heater unit. This inverted position of the
inating the necessity of replacing the entire heat
valve stem has been found to be the most con
er unit.
venient for the attachment of the valve stem to
In order to con?ne the heat to the vulcanizing
the inner tube by vulcanization.
surface of the heater unit, which is the top sur
The desirability of con?ning the heat, as far
face thereof, and minimize transfer of heat to the
as possible, to the heating surface of the heater
vulcanizer frame or base, an improved, highly ef
unit and preventing overheating of the shank of
ficient arrangement of insulation is employed
the Valve stem have been recognized as being of
both within the heater- housing and between the
considerable importance in vulcanizers of this
housing and the frame, thereby insuring, along
type, and to the attainment of these ends, the
with the induced circulation of air about the
vulcanizer of the aforementioned patent was par
shank of the valve stem during the vulcanizing
ticularly designed to reduce the heat conduction
operation, against overheating of the valve stem.
from the heater unit to the base or frame by the
A still further object of our invention is to pro
reduction of contact between the heater unit
and the base or frame by the provision of widely “ vide a novel and improved cooperative relation
ship between the various elements of the heater
spaced supporting surfaces on the frame, while
the frame was so designed as to permit an in
duced circulation of air upwardly therethrough
and about the shank of the valve stem. This ar
unit, including the electrical heating coils, ther
mostat control and extension cord, whereby to
minimize strains on these individual elements and
rangement gave rise to certain unforeseen prac- ‘
the electrical connections therebetween incident
tical difficulties in the manufacture and assem
to accidental jerks or strains upon the extension
Other and further objects of the invention will
be hereinafter referred to and the novel features
thereof de?ned in the appended claims.
bly of the vulcanizers. The present invention has,
accordingly, been developed as a material im
provement over the prior design so as to elimi
nate these practical di?iculties, while at the same '"'
time preserving and more effectively attaining the
ultimate general aims which characterized the
former design.
To be more explicit, it is one of the primary
objects of the present invention to provide a vul- '
canizer frame or base having provision for mount
ing a heater unit thereon so that the heater unit
will be supported without imposing undue strains
upon either the heater or the frame. This is
preferably attained by forming the base or frame
In the drawings:
Figure 1 is a view in side elevation of our im
proved vulcanizer, illustrating the manner of use
thereof in vulcanizing a rubber valve stem to an
inner tube, the latter elements being shown in
broken lines;
Figure 2 is a view in rear elevation of the vul
Figure 3 is an enlarged fragmentary view in top
plan of the heater supporting end of the vul
or frame at any one point.
Contributing to the
canizer frame or base, particularly illustrating
the continuous heater supporting surfaces at the
support of the heater unit and to the minimizing
outer margin thereof and about the central open
of strains thereon and on the frame, the central
ing through the base, which respectively cooper
ate with the heater unit when mounted thereon,
the heater unit being omitted from this View, and
part of the frame about the opening 8 is up
wardly extended in tubular form as indicated at
3, and the upper end of this extension termi
nates in the plane of the upper heater-support
ing face of the rim i l, for supporting engagement
with the central portion of the heater unit, as
certain other parts of the base being shown in
Figure 4 is a sectional view taken on the line
10 will be best understood by reference to Figures
Iii-4 of Figure 3 ;
Figure 5 is an enlarged bottom plan View of the
3, 4 and 6.
heater unit in its completely assembled form;
Figure 6 is a sectional view taken on the line
6—6 of Figure 5, and particularly illustrating the
details of the heat-control or thermostat unit in
cluding its porcelain mounting;
Figure 7 is a sectional view tal-ren on the line
‘l_l of Figure 5;
Figure 8 is a view in side elevation of the func
tional parts of the thermostat or heat-control "
unit; and
Figure 9 is a sectional View taken on the line
S—9 of Figure 5.
Like reference characters designate corre
sponding parts in the several ?gures of the draw- ‘
ings, wherein 6 generally denotes the base or
frame of the vulcanizer, 2 the heater unit, 3 the
pressure platen, 4 the pressure screw, and 5 the
pressure platen supporting arm which‘ is pivotally
connected to the frame at 5. Most of these parts
may be formed of simple metal castings, suitably
reinforced by lateral ribs to strengthen the same.
The base or frame 5 is preferably so constructed
that it may be conveniently mounted upon a Work
bench, table or other suitable supporting surface, 1
for which purpose a flat pad l' having inwardly
inclined lateral faces 8, S at opposite sides thereof,
is provided on the bottom of the frame I at the
rear end thereof.
This pad. ‘I, which has a more
or less dovetailed shape in transverse cross sec
tion, is adapted to be slidably received in a brack
et of corresponding outline (not shown) which
may be fastened to the work table or work bench
for releasable cooperation with the pad, as dis
closed in the prior Patent No. 2,290,106 herein
before referred to.
As shown best in Figures 1 to 4 inclusive, it will
be seen that the forward end of the frame I is
enlarged and is provided with a central vertical
opening extending completely therethrough from
top to bottom thereof, as indicated at 8. The
portion of the frame around this opening 8 is
preferably extended downwardly and terminates
at its lower enkd‘in a laterally extended circular
base 9, the lower face of which lies in the same
plane as the lower face of the pad ‘I. This base
9, together with the pad 1', allows the vulcanizer
The size of the opening 8 through the frame !
is proportioned so that it is substantially larger
than the size of the valve stem which is illus"
trated in broken lines and designated M in the
drawings. The purpose of this is to allow cool
air to freely enter the lower end of the opening
8 and rise upwardly around the valve stem iii
until it reaches the openings H5 in the central ex
tension !3, at which point the air may pass out~
wardiy through the openings 35 into the space
it within the conical enlargement ii‘- of the
frame, and thence outwardly through‘ the open
ings ii and back to the atmosphere. A continu
ous circulation of relatively cool air about the
valve stem is thus attained in the manner of a
“chimney effect,” similar to that described in the
patent previously referred to.
Referring now to the heater unit generally
designated 2, this unit preferably includes an
annular housing or casing of inverted cup-shaped
form, the upper side iii of which constitutes the
vulcanizing surface. The central portion of this
vulcanizing surface i8 is depressed or recessed as
indicated at if}, to fit the base flange of the valve
stem 14, which base flange is designated 26. As
previously indicated, the heater unit is provided
with a central opening 2!, which is aligned with
and forms a continuation of the opening 8 in the
frame I, and into which‘ openings the valve stem
it extends when positioned for vulcanization to
the inner tube, the latter being designated 22.
The housing or casing of the heater is formed
with a central tubular extension depending from
the upper side of the housing as indicated at 23,
and de?ning the central opening 2! within the
same, the lower end. of this extension terminating
on a plane with the lower end of the outer mar~
ginal ?ange 24 depending from the outer margin
of the vulcanizing surface 18. The annular space
25 between the ?ange 24 and central tubular ex
tension 23 is utilized to receive and enclose the
heating element and associated functional parts
of the heater .unit.
The heating element preferably includes a cir
cular porcelain plate 25 having formed in its up
per face a series of grooves 21 for receiving the
electrical heating coils 28 which are located at
to stand without other support When removed
from the bench clamp or bracket in which it is
the side of the plate 25 facing the vulcanizing
normally supported by engagement with the pad
- surface E8 of the heater unit, thereby raising the
1, when the vulcanizer is in use.
The upper side of the forward end of the frame
vulcanizing surface to the desired working tem
perature and minimizing chilling of the vulcaniz
ing surface when cold rubber is placed on the
i, around the opening 8, is enlarged in the form
of an inverted cone, as indicated at It, the upper
end of which terminates in a horizontal annular
vulcanizing surface.
rim l i, which in turn is provided with a relatively
low upstanding marginal flange 52 which‘ is
adapted to embrace the lower edge of the heater
terposed between the heating coils 28 and the
upper side of the housing of the heater unit to
prevent short-circuiting of the heating coils. Bo
neath the porcelain plate 25 in which the heating
coils 23 are arranged, there is provided a layer
of insulating material, such as asbestos, designat
ed 36, which prevents the heat from being di
rected downwardly and contributes to the con
?ning of the heat in the vulcanizing surface. An
additional closure plate of metal or other suitable
unit 2 when the latter is mounted on the frame i.
It will be seen that the upper face of the rim l I
is perfectly flat and continuous so that when the
heater unit 2 is placed thereon, as shown in Fig
ures 1, 2 and 4, it is effectively Supported all the
way around and perfectly balanced, with no un
due strains imposed upon either the heater unit
A sheet of mica, or other
suitable insulation, designated 29, is preferably in
material, designated 3|, may also be provided,
if desired, for closing the bottom heater unit be
neath the heating element, as clearly shown in
Figures 4 to 7 inclusive. This closure plate 3|,
the asbestos insulation 30, and the porcelain plate
26 carrying the heating coils 28 are all pref
erably attached to the heater unit housing by a
plurality of screws designated 32, passing through
these elements and threaded into the upper side
of the housing. Three of these screws, designated 10
32, have been shown in the drawings, but it is
to be understood that the number may be varied
as desired.
Also mounted in the housing of the heater unit
is a heat-control unit generally designated 33,
the same including a mounting element made of
porcelain or other insulating material, designated
34, which serves to support a thermostat unit,
designated 35, of any approved type, the details
of which are not material to an understanding of 20
undue strains imposed on the extension cord.
The clamp bar 48 is preferably arranged inside
the housing and is secured in position by the
screws 49, 49, threadedly engaged therewith and
passing through the extension 46 of the porcelain
mounting 34.
By the arrangement of parts as just described,
the heater unit affords the maximum protection
to the functional parts thereof, while at the same
time, the parts are unusually simple and may be
manufactured at relatively low cost. Moreover,
the heater unit is virtually tamper-proof, yet the
functional parts thereof are conveniently accessi
ble for purposes of repair or replacement when
this is required.
The heater unit 2, when fully assembled, may
be conveniently mounted on the frame I by plac
ing the same in position on the flat supporting
surfaces afforded by the rim H and central ex
tension l3 of the frame, the former engaging the
outer marginal flange or wall 24 of the heater
housing, and the latter engaging the inner tu
bular extension 23 of the housing which depends
from the vulcanizing surface I8. The upstand
ing ?ange [2 at the outer margin of the rim H
of the frame I assists in accurately positioning
the heater unit on the frame, with the central
opening 2| in the heater unit aligned with the
opening 8 in the frame. When so positioned, the
heater unit may be attached to the frame by the
screws 50, 50, which pass through the horizontal
rim ll of the frame and are threadedly engaged
this invention. The thermostat element gener
ally illustrated in the drawings is of the bi-metal
type, but it is to be understood that any other
type of heat-control may be employed where de
sired. The important object of this feature of 25
the invention is to completely enclose the heatcontrol unit within the housing of the heater unit,
while at the same time simplifying the mounting
thereof and affording ready access thereto for
replacement, repair or adjustment when required. 3
It will be seen particularly from reference to
Figures 5 and 6 that the heat-control unit is
in enlarged bosses 5| formed on the inner \face
mounted in one side of the housing of the heater
of the outer marginal flange of the heater hous
unit and is attached thereto by two screws, des1g
nated 36, which are threadedly engaged in bosses :1; ing. These bosses are preferably made of ample
size to resist the setting up of undue strains in
31 formed on the inner face of the outer mar
the heater housing when the bolts 50 are tight
ginal ?ange 24 of the heater unit housing. Simi
ened up to clamp the heater unit to the frame
lar bosses 38 are provided for engaging the screws
l. Two such clamping bolts’, have been found to
32 previously refered to. In mounting the heat
be ordinarily sufficient, although the number may
control unit in the housing of the heater unit,
be increased if desired.
an additional layer of insulating material, such as
As an additional precaution against the trans
asbestos, is interposed between the porcelain
mission of heat from the heater unit to the vul
mounting 34 and the closure plate 3i, as indi
canizer frame, an asbestos gasket 52 may be
cated at 39. ' The closure plate 3| and the asbes
tos insulation 30 are suitably cut away as indi 45 interposed between the lower end of the outer
marginal ?ange 24 of the heater housing and
cated at 40 to accommodate the heat-control
the upper side of the annular rim H of the
mounting as shown best in Figure 6 of the draw
vulcanizer frame I. A similar gasket 53 may be
ings, this end of the mounting housing the ther
interposed between the tubular extension 23 of
mostat elements proper and completely enclos
ing the same to prevent their accidental damage. 50 the heater housing and the tubular extension 13
of the vulcanizer frame. It is to be understood,
Suitable connections are established between the
however, that these gaskets are not essential,
heating coils 28 and the heat-contro1 unit, one
since the special construction of the heater unit
such connection having the form of a bus bar
itself is such as to minimize the transfer of heat
designated 4|. One side of the heat-control unit
is also connected to one wire of an extension 55 from the heating coils 28 in a downward direc
cord 42, this connection being made at 43 which
In the use of the vulcanizer, after placing the
designates a terminal provided at one end of
rubber valve stem and the inner tube in the po
the thermostat element. The other wire of the
sitions as shown in Figures 1, 2 and 4 of the
extension cord 42 is connected to a terminal post
44 which is carried by the porcelain mounting 34, 60 drawings, the platen-supporting arm 5, which is
pivotally connected to the frame I by the pin 6,
and which in turn is connected to the opposite
is moved in a counter-clockwise direction, as
end of the heating coils 28, thus completing the
viewed in Figure 1, to a position permitting the
circuit through the thermostat and the heating
pivotal abutment lug 54 to be engaged beneath
coils. A third wire, grounded to the heater cas
ing at one of the bolts 32, may be employed when 65 the abutment 55 on the arm 5, following which
the pressure screw 4 is screwed down with the aid
the heater is connected to a 220-volt power line.
of the hand wheel 56 to ?rmly clamp the inner
As seen best from reference to Figures 5 and 9,
tube and valve stem against the vulcanizing sur
the outer marginal flange 24 of the housing of
face l8 of the heater unit 2. The vulcanizing
the heater unit is interrupted at 45, and through
this interruption, the porcelain mounting 34 is 70 operation may then be performed by energizing
the heater unit which may be connected to any
extended outwardly, as shown at 46. This ex
convenient outlet plug by the extension cord 42.
tension 46 is recessed at 41 to ?t snugly around
On completion of the vulcanizing operation, the
the extension cord 42, and a cord clamp bar 48
pressure screw 4 is unscrewed for enough to allow
bridges the recess 41 across the cord 42 and ?rm
ly clamps the cord in the recess so as to resist any 76 the pivotal abutment to be disengaged from the
abutment 55 on the platen supporting arm 5,
and the surrounding inclined wall are each pro
whereupon the platen supporting arm, together
with the platen 3, may be swung upwardly to the
dotted line position shown in Figure 1, follow
ing which the work may be removed from the
vulcanizer. Manipulation of the pivotal abut
ment 54 to and from its cooperative position with
the abutment 55 is accomplished through the
nular housing de?ning an unobstructed central
opening therethrough and provided with an outer
marginal ?ange thereabout and an inner ?ange
around the central opening aforesaid, said ?anges
knob or handle 5‘! formed on one end of the
de?ning therebetween an annular space, a heat_
vided with apertures laterally communicating
with the interior of the tubular part aforesaid.
3. An electrical heater unit comprising an an
pivot pin 58 on which the abutment 54 is ?xed 10 ing element disposed in the annular space afore
for rotation with this pin, the pin 58 in turn be
said and electrically insulated from the housing,
ing free to rotate in the vulcanizer frame I.
closure means including thermal insulation ar
In addition to use for vulcanizing rubber valve
ranged in the annular space beneath the heat
stems, the vulcanizer may be adapted vfor use
ing element, thermostatic means also disposed in
in vulcanizing ?at patches, as more fully de
the annular space and within the housing and
scribed in the prior patent hereinbefore referred
including an insulated mounting extended lat
While the speci?c details have been herein
shown and described, the invention is not con
?ned thereto, as changes and alterations may be ,
made without departing from the spirit thereof
as de?ned by the appended claims.
What we claim is:
1. A vulcanizer of the class described, compris
ing a frame including a hollow tubular part ar- -,
ranged with its central axis in a vertical position,
said tubular part being provided with an out
erally through the outer marginal ?ange of the
housing, and a conductor cord rigidly ?xed to
the insulated mounting and electrically connected
in circuit with the heating element and thermol
static means, said thermostatic means and con
ductor cord being both attached to the mount
ing within the housing of the heater unit, and
the mounting being attached to the housing inde
pendently of the heating element.
4. An electrical heater unit comprising an an—
nular housing de?ning an unobstructed central
wardly and upwardly inclined Wall extending
opening therethrough and provided with an outer
about the upper end of the same and terminat
marginal ?ange thereabout and an inner ?ange
ing at its upper end in a horizontally disposed 30 around the central opening aforesaid, said flanges
?at, continuous annular rim radially spaced from
de?ning therebetween an annular space, a heat
and at the same level as the upper end of the
tubular part, a heater unit mounted on the frame,
ing element disposed in the annular space afore
said and electrically insulated from the housing,
said heater unit including a circular housing of
inverted cup-shaped form, the upper side of said ‘
closure means including thermal insulation ar
ranged in the annular space beneath the heat
ing element, thermostatic means also disposed
in the annular space within the housing and in
housing constituting a vulcanizing surface, with
its outer marginal wall depending from the
vulcanizing surface and resting upon the an
cluding an insulated mounting extended laterally
nular rim of the frame aforesaid, said heater
through the outer marginal ?ange of the hous
unit also having a central opening there M ing, and a conductor cord rigidly ?xed to the in
through aligned with the tubular part of the
sulated mounting and electrically connected in
frame and having a central tubular hub sur
circuit with the heating element and thermo
rounding the opening and depending from the
static means, said thermostatic means and con
vulcanizing surface, with its lower end resting
ductor cord being both attached to the mount
upon the upper end of the tubular part of the ? ing within the housing of the heater unit, and the
frame, and a pressure platen carried by the frame
mounting being attached to the housing inde
in cooperative relation to the vulcanizing sur
pendently of the heating element and thermally
face of the heater unit.
insulated from the latter.
2. A vulcanizer as defined in claim 1, wherein
the upper end of the tubular part of the frame 50
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