Патент USA US2404989код для вставки
Jilly 30, 1946. P, SCHM‘D ETAL 2,404,989 VULCANIZER Filéd June 25, 1944 ' 5 Sheets-Sheet 1 ml'm l July 30, 1946. Pa SCHMED ET AL 294M939 VULCANIZER Filed June 25, 1944 (D A) / 01 .MI 16 W ‘Ill -_ ‘% :5 Sheets-Sheet 2~ . July 30, 19476., P. SCHMID ETAL 2,404,989 VULCANIZER' Filed June 23, 1944 F2596. 10 1s s _ - ' 3 Sheets-Sheet 5 24 Patented July 30, 1946 2,404,989 UNITED STATES PATENT OFFICE 2,404,989 VULCANIZER 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) 1 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 tamper-proof. 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 cord. 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 canizer; Figure 3 is an enlarged fragmentary view in top plan of the heater supporting end of the vul 2,404,989 3 4 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 section; 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 2,404,989 6 5 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 tion. 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 l 2,404,989 8 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 to. 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 PAUL SCHMID. the upper end of the tubular part of the frame 50 HENRY I-IYL'I‘ON.