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Aug. 13, 1946. 2,405,869 A. WILD THERMOSTATIC SWITCH Filed Jan. 24, 1944' ' 32 .I ’ INVENTOR. 2,405,869 Patented Aug. 13, 1946 UNITED STATES PATENT OFFICE 2,405,869 THEBMOSTATIC SWITCH Alfred Wild, Milwaukee, Wis. Application January 24, 1944, Serial No. 519,481 11 Claims. (01. 200—139) 1 The present invention relates in general to im provements in the art of temperature control, and relates more particularly to improvements in the construction and operation of thermostatic switches for controlling the actuation of electric 2 An additional speci?c object of my invention is to provide a simple, compact and strong switch assembly which may be manufactured at moderate cost from metal stampings or the like, ER and which may also be readily assembled, dis mantled, or associated with the device or system with which it is to be normally associated. A further speci?c object of this invention is to provide an e?icient electric switch which may be operation, and ?exible in its adaptations and 10 adjusted throughout a considerable range, and the actuation of which is controllable by means heaters or the like. The primary object of this invention is to pro vide an improved thermostatic switch which is simple and durable in construction, reliable in uses. of a sturdy and reliable lei-metallic element. These and other objects and advantages of the present invention should be more readily ap and especially in conjunction with electrically parent from the following detailed description. heated ?at irons, to have available a durable and A clear conception of the several features con~ reliable thermostatic control which is readily ad stituting the present invention, and of the con justable so as to vary the degree of heating. struction and operation of my improved thermo While many different types of such thermostats static switch, may be had by referring to the or thermostatic switches have heretofore been drawing accompanying and forming a part of proposed and used with varying degrees of suc 20 this speci?cation wherein like reference char cess, most of these prior devices are either rela acters designate the same or similar parts in the tively complicated in construction, or frail in various views. structure, or not accurately adjustable, or insuf? Fig. 1 is a part sectional side elevation of the ciently sensitive and reliable in operation, or un switch, showing the normally ?xed upper con adapted for diverse uses and especially inplaces tact in its uppermost and inactive position of where they are subject to jarring and jolting, or adjustment and the contacts open; relatively costly to manufacture. Many of the Fig. 2 is a full side elevation of the same switch, prior thermostatic controls are therefore objec with the upper contact moved downwardly to tionable for one or more of the above reasons and an active position, and showing the contacts It is extremely desirable in connection with the operation of electric heaters for diverse purposes, have been a source of considerable annoyance to users thereof. It is a more speci?c object of my invention to provide a new and useful thermostatic control device which obviates all of the above mentioned objections and annoyances, and which is simple, sturdy, dependable, and relatively inexpensive. Another speci?c object of this invention is to provide an improved thermostat which is adapted for many uses, and especially in portable devices such as ?at irons which are subject to jarring and jolting, Without detrimentally affecting the operation of the thermostat. A further speci?c object of the invention is to provide an improved thermostatic switch which closed; Fig. 3 is another elevation similar to that of Fig. 2, but showing the contacts moved down wardly to an extreme inactive position and closed, in order to reveal the available wiping action; and Fig. 4 is a transverse vertical section through the switch assemblage, taken along the line 4-5 of Fig. 1. While the invention has been shown and de scribed herein as being especially applicable to electric thermostatic switches which are ad vantageously applicable to electrically heated ?at irons, it is not my desire to unnecessarily limit the utility of the improvement by virtue of this may be conveniently and accurately adjusted to speci?c disclosure. control the degree of heat generated by the heater Referring to the drawing, the improved ther to which it is applied, and all parts of which are mostatic switch shown therein by Way of illus readily accessible for inspection. tration, is adapted to be associated with the wall Still another speci?c object of the present in 6 of various types of heaters, and comprises a 50 vention is to provide an improved temperature supporting bracket 1 having an inverted U-shaped controlled electric switch assemblage in which the member or ?ange 8 at one end and an angular relative position of the ?xed and movable con abutment projection 9 disposed laterally of the tacts may be readily varied, but wherein the con flange 8; an L-shaped rigid upper contact car tacts are kept clean and most e?ective at all 55 rier arm l0 pivotally suspended at its medial por times by suitable wiping action. 3 2,405,869 4 tion from the ?ange 8 by means of a pivot pin I I ing bracket ‘I when the contacts I3, H are closed. and having one end provided with a downwardly The U-sh'aped thermostatic element 23 which co directed ?ange l2 while its opposite end supports acts with the projection 9 and lower arm I4 and an adjustable but normally ?xed contact l3; an which is retained in proper place by the bracket L-shaped rigid lower contact carrier arm I4 like 5 ?ange 8, will be in relatively collapsed condition wise pivotally suspended at its medial portion as shown in Fig. 2 when cool, and will then per from the bracket ?ange 3 by means of a pivot mit the contacts I3, I ‘I to engage each other thus pin I 5 and having one end provided with an completing the circuit and energizing the electric upwardly directed ?ange It spaced from the heater which the switch controls. The coil spring ?ange I2, while its opposite end supports a mov 22 which coacts with the end ?anges I2, I6 of the able contact I'! which is cooperable with the ?xed carrier arms Ill, I4 will keep the contacts I 3, I‘! contact I3 to make and break the electric circuit; closed, until su?icient heat is imparted to the an adjusting screw or rod I 8 having screw threads thermostatic element 23 to expand the latter and coacting with a ?ange I9 of the heater wall 6, and being provided at one end with an adjusting wheel 20 while its opposite end 2| coacts with a medial portion of the upper carrier arm Ill; a helical compression spring 22 coacting with the carrier arm ?anges I2, IE and constantly urging the upper arm Ill against the rod end 25 , and the lower arm I4 toward the abutment projection 9 and toward contact closed position; and a U shaped thermostatic element 23 disposed between and normally coacting with the ?xed bracket projection 9 and with the medial portion of the lower arm I4. The main supporting bracket 1 with its ?ange 8 and abutment projection 9 may be formed with the aid of punches and dies, of a single piece of sheet metal or the like, preferably having good heat conducting characteristics, and this bracket ‘I may be detachably attached to the heated wall 6 with the aid of screws 24. The rigid L-shaped contact carrier levers or arms Ill, Ill may also be formed of durable metal either by casting, or of sheet metal with the aid of punches and dies, and the pivot pins II, l5 about which the arms II], II are freely swingable, should preferably be removably but ?rmly attached to the bracket ‘I and ?ange 8 so as to facilitate assembly and dis mantling of the switch mechanism. The adjust able but normally stationary upper contact I3 is secured directly to a sheet-metal conductor plate cause it to operate in opposition to the spring tension so as to swing the lower arm I4 down wardly and to thereby separate or open the con tacts I3, I’! thus breaking the circuit. This ac tion is normally quite rapid; and When the ther mostatic element 23 again cools off, the spring 22 will become quickly e?ective to again close the contacts I3, I? and to make the electric circuit. The degree of heating and cooling of the element 23, necessary to effect such automatic opening and closing of the switch, may obviously be read ' ily varied by merely manipulating the hand wheel 20, and the screw threads on the rod I3 may be made relatively small or ?ne in order to augment the sensitiveness of the adjustment. As indicated by Figs. 1 to 3 inclusive, the line of engagement between the curved contacts I 3, I ‘I, will be shifted slightly for each successive adjustment of the upper carrier arm Ill; and due to the use of’sep arate parallel pivot pins II, I5 for swingably supporting the contact carrier arms Ill, I4, the free swinging movement of these arms is not materially retarded by their mountings and con siderable lateral wiping action is imparted to the contacts l3, I'I regardless of the position of ad justment. Repeated adjustment and operation will therefore maintain the faces of the con tacts I3, I 7 clean at all times, thus assuring most effective contacting and insuring dependable op eration; and while the positions of the elements 25 which is insulated from its carrier arm II] by shown in Figs. 1 and 3 are abnormal or inactive means of insulation plates 26 and is rigidly at positions, the mechanism may be adjusted to tached to the arm IE3 by insulated rivets 21; and various intermediate active positions throughout the lower movable contact II is likewise secured a considerable range. to a similar conductor plate 26 which is also From the foregoing detailed description, it will insulated from its carrier arm I II by means of be apparent that my present invention provides insulation plates 29 and is rigidly attached to the 50 an improved thermostatic switch assemblage arm I4 by insulated rivets 38. Each of the plates which is simple, compact and durable in con 26, 28 is provided with an integral ear to which struction, and which is moreover highly reliable the ?exible leads or conductors BI, 32 may be in operation and ?exible in its adaptations or attached, and it is to be noted that the contact uses. The improved structure is especially adapt faces of the contacts I3, II are curved so as to ed for use in conjunction with portable devices provide approximately line contact for every such as ?at irons, and jarring or jolting of the available position of relative adjustment. The mechanism does not impair or detrimentally af upper contact adjusting hand wheel 29 may be fect its normal operation. The actuation of the provided on its upper face with calibrations or improved thermostatic switch may obviously be markings which are cooperable with a pointer or varied throughout a considerable range by merely the like associated with the heater wall ?ange I 9, adjusting the hand wheel 26 and rod I8, and by in order to visibly indicate the degree of actual forming the contacts I3, Ill with oppositely curved adjustment of the normally ?xed upper arm It; faces, and by mounting the contact carrier arms and when utilizing the improved thermostatic on separate pivots, the contact faces are main switch to control the heating of a ?at iron, these tained clean and most e?ective for all positions calibrations of the wheel 28 ordinarily designate of relative adjustment. The U-shaped thermo static element 23 and the compression spring 22 cooperate to insure eifective actuation of the During normal operation of the improved ther~ switch at all times, and the various parts of the mostatic switch‘, the upper adjustable but nor assemblage may obviously be constructed of suit mally ?xed con-tact carrier arm III should be 70 able materials and with the aid of punches and moved downwardly with the aid of the adjusting the type or class of work to be performed when the wheel is adjusted to various positions. hand wheel 20 and rod IE, to a position such as shown in Fig. 2', so that the lower arm I4 will not engage the abutment projection 9 of the support dies in a durable manner. All portions of the im proved switch are readily accessible and the nor mal operation thereof is automatic, and the im 75 proved thermostatic switch has proven highly 2,406,869 5 satisfactory in actual use and can obviously be manufactured at moderate cost. The improved construction of the supporting brackets 1 also permits the various parts to be readily assembled and dismantled, while providing a ?rm support and retainer for the contact carrier arms l0, H, the thermostatic element 23, and the spring 22 when properly assembled. It should be understood that it is not desired to 6 arms swingable upon said pivots and extending on opposite sides of said abutment, each of said arms being of L-shape and having an end ?ange extending toward the other arm in spaced rela tion to each other, a spring coacting with said ?anges for constantly urging the contact carry ing ends of said arms toward each other, a ther mostatic element for separating said arm ends interposed between said ?xed bracket abutment limit this invention to the exact details of con 10 and one of said arms, and adjustable means co acting with the other arm to swing the same struction or to the precise mode of operation, about its supporting pivot. herein shown and described, for various modi? cations within the scope of the claims may oc 6. In a switch, a supporting bracket having spaced parallel pivots and a ?xed abutment pro 15 jecting from the same side thereof, a pair of rigid approximately parallel elongated contact car 1. A switch comprising, a pair of elongated rig rier arms swingable upon said pivots and extend id L-shaped carrier arms swingable about spaced ing on opposite sides of said abutment, each of pivots and having their corresponding ends pro said arms being of L-shape and having an inte vided with surfaces which are spaced apart and disposed on one side of said pivots, cooperating 20 gral rigid end ?ange extending toward the other arm in spaced relation to each other, a helical contacts carried by the opposite corresponding compression spring coacting with said ?anges to ends of said arms, a compression spring coacting :eparate the contact carrying ends of said arms, with said surfaces and constantly resiliently urg and a U-shaped thermostatic element for sepa ing said contacts toward each other through said rigid arms, and a U-shaped thermostatic element 25 rating said arm ends interposed between said ?xed bracket abutment and the medial portion of interposed between said arms on the opposite side one of said rigid arms. of said pivots and acting in opposition to said cur to persons skilled in the art. I claim: ‘7. In a switch, a supporting bracket having spaced parallel pivots and an integral ?xed abut 2. A switch comprising, a pair of elongated rigid L-shaped carrier arms swingable about 30 ment projecting from the same side thereof, a spring. spaced pivots and having their corresponding ends directed toward each other and provided with surfaces which‘ are spaced apart and dis posed on one side of said pivots, cooperating con tacts carried by the opposite corresponding ends of said arms, a compression spring coacting with said surfaces and constantly resiliently urging said contacts toward each other through said pair of approximately parallel elongated rigid contact carrier arms swingable upon said pivots and extending on opposite sides of said abutment, each‘ of said arms being of L-shape and having an integral rigid end ?ange extending toward the other arm in spaced relation to each other, a heli cal compression spring coacting with said ?anges midway between said pivots to separate the con tact carrying ends of said arms, a U-shaped ther rigid arms, a U-shaped thermostatic element in terposed between said arms on the opposiite side 40 mostatic element for separating said arm ends interposed between said ?xed bracket abutment of said pivots and acting in opposition to said and the medial portion of one of said arms, and spring, and adjustable means for varying the a threaded rod coacting with the corresponding ?xed positioning of one of said arms. medial portion of the other of said arms for mov 3. A switch comprising, a supportiing bracket ing said arm toward said abutment to compress having an integral ?ange and an integral ?xed said element. abutment spaced from said ?ange, parallel pivots 8. In a switch‘, a bracket having parallel pivots secured to said bracket and said ?ange, a pair of and a ?xed abutment projecting from the same carrier arms freely swingably suspended from side thereof, a pair of elongated arms freely said pivots and extending on opposite sides of said abutment and having cooperating contacts ' swingably suspended upon said pivots and ex tending along said side of said bracket, coacting at the corresponding swinging ends thereof, resil contacts carried by the corresponding swinging ient means coacting directly with the opposite ends of said arms beyond said abutment, the co corresponding ends of said arms for constantly acting surfaces of said contacts being reversely urging said contacts toward each other, and a curved and being relatively shiftable during U-shaped thermostatic element disposed between swinging of said arms, a spring coacting with the said arms and coacting with said ?xed bracket opposite ends of said arms for constantly urging abutment and with one of said arms for moving said contacts toward each other, and a thermo said contacts apart. static element interposed between said ?xed abut 4. In a switch, a supporting bracket having spaced parallel pivots and a ?xed abutment pro 60 ment and one of said arms for separating said contacts. jecting from the same side thereof, a pair of ap 9. In a switch, a bracket having parallel pivots proximately parallel elongated contact carrier and a ?xed abutment projecting from the same arms swingable upon said pivots and extending side thereof, a pair of elongated arms freely on opposiite sides of said abutment, each of said swingably suspended upon said pivots and ex arms having an end ?ange extending toward the tending along said side of said bracket, coacting other arm in spaced relation to each other, a contacts carried by the corresponding swinging spring coacting with said ?anges for constantly ends of said arms beyond said abutment, a spring urging the contact carrying ends of said arms to coacting with the opposite ends of said arms for ward each other, and a thermostatic element for constantly urging said contacts toward each separating said arm ends interposed between said other, and a thermostatic element interposed be fixed bracket abutment and one of said arms. tween said ?xed abutment and one of said arms 5. In a switch, a supporting bracket having for separating said contacts. spaced parallel pivots and a ?xed abutment pro 10. In a thermostatic switch, a bracket having jecting from the same side thereof, a pair of rigid approximately parallel elongated contact carrier " thereon a pivot and a ?xed abutment spaced from 2,405,869 7 the pivot, an elongated arm freely swingably sus pended upon said pivot, another arm swingably suspended from said bracket adjacent to said piv at and extending in the same general direction as said ?rst mentioned arm, coacting contacts carried by the corresponding swinging ends of 8 pended upon said pivot, another arm swingably suspended from said bracket adjacent to said piv ot and extending in the same general direction as said ?rst mentioned arm, coacting contacts car ried by the corresponding swinging ends of said arms, a spring coacting with said arms to con said arms, a spring coacting with said arms to stantly urge said contacts toward each‘ other, a constantly urge said contacts toward each other, thermostatic element interposed between said a thermostatic element interposed between said ?xed abutment and said second mentioned con ?xed abutment and one of said arms, and adjust 10 tact carrier arm, and an adjusting screw coacting able means coacting with the other arm to prop with said ?rst mentioned freely swingable con erly relatively position said contacts for actuation tact carrier arm to properly relatively position by said thermostatic element. said contacts for actuation by said thermostatic 11. In a thermostatic switch, a bracket having element. thereon a pivot and a ?xed abutment spaced from 15 the pivot, an elongated arm freely swingably sus ALFREDWILD.