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Sept. 3, 1946. ?R, J, MQFALL ' 2,407,089 SNAP SWITCH Filed May 18. 1944 -2 Sheets-Sheet ?1 " .1 .2 77%)? - 21km, 5 f m 16 61:02, z閣aawmrw�. Sept. 3, ?1946. R. J. MCFALL _ 2,407,089 SNAP SWITCH ? Filed_May 18, '1944 2 Sheets-Sheet 2 21 22 93 I Patented Sept. 3, 1946 2,407,089 UNITED STATES PATENT OFFICE 2,407,089 SNAP SWITCH Robert J. llIcFall, Haworth, N. .1. Application May 18, 1944, Serial No. 536,167? 10 Claims. (Cl. 200-122) 1 2 This invention relates to snap switches, and more particularly to switches of the type con structed of resilient? sheet metal. The present application is a continuation in rounding this hole as? by hammering or pressing part of my prior co-pending application Serial No. 162,056, ?led September 1, 1937, now Patent No. 2,352,215, dated June 2'7, 1944. The general object of the invention is to pro vide a snap switch of exceptionally simple con so as to form a kind of bulge or cup 3. In other words, the material is spread out in this area, and thus, con?ned by the surrounding material, is placed under strain. It will be understood that the strip is, in actual practice, relatively much thinner than shown in Fig. 2, and that the bulge may not be so deep. When the bulged or strained portion of the strip is however clamped struction, and which may be readily operated 10 tightly as, for example, against a ?xed support, either manually or by any suitable actuating de such as 4, by means of a screw 5, as shown in Fig. vice. 3, it develops the peculiar property of snapping A speci?c object is to provide a snap switch suddenly from side to side when moved laterally. consisting of but a single piece or strip of metal, Furthermore, instead of being like a pivoted lever, and so constructed that pressure applied to one 15 in which opposite ends move in opposite direc tions, the opposite ends of my improved resilient end causes the other end to move, to open or close a circuit. strip move in the same direction. rl?hus, when A still further object is to devise improved ther~ the lower end is pushed toward the right, the up mally operated means for? actuating such a per end snaps over to the right, and vice versa. switch. 20 In Fig. 3, I have shown the movement and bend ing or bowing of this strip as somewhat eXag~ In order that the invention may be readily un gerated for the sake of clearness. derstood, reference is had to the accompanying drawings forming part of this speci?cation, and It will, of course, be understood that the head of the screw 5 is relatively small, as compared in which: Fig. 1 is a front view of my improved switch 25 with the bulge 3', so as to permit the metal in the region immediately surrounding the screw head member itself; within the bulge to freely move or buckle. It Fig. 2 is an edge view thereof, partly in section; Fig. 3 is a diagrammatic view illustrating one will be further understood that, as one end of the strip I' is? moved laterally, it ?nally reaches a po manner in which my improved switch may be employed, and showing my novel thermally oper 30 sition where the bulge is caused to suddenly re-~ verse, relative to the: body of the strip, shifting ated means for actuating the same; Fig. Li is a similar View, showing magnetically from one side to the? other, thus throwing both operated means for actuating the switch; ends of? the strip in the? same direction, with a snap action. 5 is a diagrammatic view showing another thermally operated means for actuating the 35 In Fig. 3, I have shown an improved thermally operated switch actuating means or thermo-elec switch; tric' relay. I Fig. 6 is a similar view showing pressure oper This improved thermo-ele'ctric relay comprises ated means for actuating the switch; Fig. '7 is a diagrammatic view illustrating man a pair of bi-metallic strips 6 and ?l, mounted in ual means for operating the switch, parts being 40 any suitable way at one end to a ?xed support as indicated at Sa'and 9a. The other end of each of shown in dotted lines; and Fig. 8 is a view similar to Fig. 3, parts being the strips is bent inwardly toward the other strip, so that the free ends are substantially in align omitted, and showing a somewhat modi?ed ar rangement. ment. ? My improved snap switch member 5 is posi So far as concerns the switch itself, and the 45 actuating means therefor, Figs. 1, 2 and 3 are tioned between the two strips 6 and ?I, generally identical with ?gures contained in the drawings parallel therewith. The ends of the binmetallic of my said prior co~pending application. strips 6 and l are adapted to engage the strip I Referring ?rst to Figs. 1 and 2, I have at at a point below the support ll, and to push the tempted to illustrate in detail the construction 50 strip one way or the other, at this point. As of my improved snap switch member itself. It above explained, this has the effect of causing the consists of a thin, flat strip I, made of springy upper'end to snap over in the same direction in which the lower end is pushed. material, such as bronze, and at a suitable point intermediate its ends I make a hole 2, and de ' The upper end of the strip or switch I is adapt form or upset the material immediately sur 65 ed to engage contacts 8 and 9, connected re 2,407,089 3 4 spectively with the ends or windings II] and II, which encircle the respective bi-metallie strips 6 and ?I. The opposite ends of the windings II) and II are connected to binding posts which are the distance they must move in order to oper ate the switch. By varying these factors, a re~ lay can be designed to operate on almost any desired time interval. Moreover, by providing connected by Wires I2 and I3 to the opposite con adjustments for the contacts, the delay period of any given relay may be varied considerably. tact points I4 and I5 of the usual thermostat I6. Referring now to Fig. 4, I have shown electro The bi-metallic strip of the thermostat I6 is con~ magnets I0? and II? for operating the switch or nected by wire II with one side of a transformer relay instead of the heating windings I0 and II I8, the other side of which is connected by wire 49 with the screw 5. The primary of the trans 10 of Fig. 3. Otherwise, the arrangement is the former I8 is connected with a suitable source of same, except for the time delay feature, and the parts are similarly numbered. Fixed contacts alternating current 2|, 22. From one side 25, 8' and 9' are arranged to be engaged by the of this source, extends a wire 23 to a motor 24, switch member I? and control the circuits through which may be the motor of a stoker or oil burner. The circuit of motor 24 is controlled by a spe-' 15 the electro-magnets II' and I0? respectively. In Fig. 5, I have diagrammatically illustrated cial contact 26 carried by but insulated from the an arrangement in which my improved snap lower end of the spring strip I. This contact is switch I may be actuated directly by a thermo adapted to engage a ?xed contact 21, which is static element subjected to the temperature of the connected by Wire 28 directly with the other side of the supply circuit, at binding post 22. 20 The snap switch I is shown in full lines in the position to which it has been moved by the last operation of the thermostat It, namely, an op eration which moved the snap switch I to a po sition in which it opened the circuit of motor 24. Should the building become too cool and the thermostat I5, answering the demand for more heat, move over into engagement with the left ambient atmosphere. In this ?gure, the motor 24 is supplied with current through leads 29 and 3I, and its circuit is controlled at a contact 30, arranged to be engaged by the switch member I. A thermostatic device in the nature of an ex pansible bellows is illustrated at 32 and a rod 33 extends from this bellows and is provided at its end with a yoke 34, which loosely engages over the lower end of the switch member I. If we hand contact I4, a circuit will be established from - assume that, in this case, as before, the motor one side of the transformer through wire Iil to 30 24 operates a Stoker Or oil burner for heating the premises where the thermostatic element 32 is the snap switch I, thence to contact 8, through located, then when the temperature has risen to the winding IE], wire I2, thermostat I8, and wire the desired point, this thermostatic element ex I?I, back to the transformer. Current ?owing through this circuit will cause the Winding I0 1� pands, thus pushing laterally the lower end of the switch element I over to the position illus to heat the bi-metallic strip 6 and its free end trated in dotted lines. As above explained, this will therefore move inwardly until it ?nally encauses the upper end of the switch element to gages and pushes over the lower end of the snap also snap over into dotted line position, thus switch I. When this lower end has been moved over a certain distance, the strip will snap into , opening the motor circuit. When the tempera dotted line position, thus closing and holding ture falls too low, the bellows 32 contracts, thus moving the switch back to full line position again closed the motor circuit at 21, and at the same and again closing the motor circuit. time breaking contact at 8 and closing it at 9. In Fig. 6, I have shown a similar arrangement, The breaking of the contact at 8 stops the cur� but arranged to be controlled by a ?uid pressure rent flow through the actuating or heating coil I0, which caused the operation, and at the same 45 responsive device. This? is also indicated as a bellows 32', supplied with fluid through a pipe time prepares a circuit through the other heat 35. In this case, the motor 24 might operate a ing coil I I, ready for the next operation. The pump or compressor. When the pressure rises to motor circuit being closed at 21, the motor 24 the desired point, the bellows 3f!? expands and will operate to feed coal or oil to the furnace and at the same time supply air thereto until the de 50 pushes over the lower end of the switch element, thus causing the upper end to snap over into sired heat has been produced. When the term perature rises to the desired point, the thermo stat IB engages the right hand contact I5, thus closing the circuit through the heating coil II, and causing the bi-metallic strip 1 to push the snap switch I back into full line position again, thus opening the motor circuit and allowing the burner to be idle. dotted line position, thus interrupting the motor circuit. In Fig. 7, I have illustrated one Way in which my improved switch member may be operated manually. In this ?gure, I have shown, in dotted lines, the conventional representation of an ordi nary lamp socket, the body being indicated at 35, and the threaded shell at 31. The usual push tric relay above described is that it operates as 60 pin is shown at 3B? and this is provided with a slot or opening in which the lower end of the a time delay device. If the house thermostat switch member I is loosely received, this switch closes at I4 (say), thus causing current to ?ow member being anchored at its middle part to a through heating coil I0, this current must per ?xed support, by means of the screw 5, as before. sist for an appreciable length of time before the In the closed positions shown, the switch member bi-metallic element 6 heats up enough to expand is adapted to engage a contact 39, connected with su?iciently to kick the switch over. By this the threaded shell 31 of the socket. One wire means, a momentary closing of the circuit at I4, all of the lamp cord is connected to the screw due to vibration, or to a gust of cold air as from 5. while the other wire 42 is connected to the a suddenly opened door, has no effect on the mo- . center contact 4I. tor 24. Thus, my slow acting relay lends sta bility to the system, and prevents accidental op From this, it will be seen that when the push pin 38 is moved toward the right, the lower end oration. of the switch member I will be de?ected later The timing is controlled by several factors, in~ cluding the heating capacity of the windings, ally until a point is reached where the deformed the length and mass of the bi-metallic strips, and 75 portion buckles, thus causing the upper end of An advantage of my improved thermo-elec- . 2,407,089 5 the switch member to snap toward the right also, and thereby disengage the contact 39. It will be understood that the resilience of the strip I is suiiicient to yieldingly hold the push pin 33 in either of its extreme positions. Thus, in my improved construction, the switch member itself takes the place both of the circuit 6 8. The combination with a snap switch com prising a resilient strip anchored at a point in termediate its ends, and having a deformed por tion adjacent the point of anchorage, of a pair of electrically actuated means for moving one end of said strip laterally in opposite directions, a controlling means and of the spring means usual pair of contacts to each of which one side of one of said electrically actuated means is connected, ly employed in this type of mechanism. and. the other end of said strip being positioned In Fig. 8, I have shown a slight variation of 10 to play between and alternately engage said con tacts, and said strip forming a part of the circuit the arrangement illustrated in Fig. 3. In this of said electrically actuated means, whereby when modification, the switch member is designated the first mentioned end is moved laterally by 5', and its lower end is made somewhat shorter one of said electrically actuated means beyond a than in Fig. 3. The motor controllirrr contact 25 is mounted on the upper, instead of the lower 15 certain position, the other end moves in the same direction with a snap action, thereby disen end of the switch member, and engages the con gaging one of said contacts and breaking the cir tact point 22' at the same time that the extreme cuit through one electrically actuated means, and end of the switch member engages the contact engaging the other contact and establishing at 9, as indicated in dotted lines. This arrrange ment gives a somewhat better snap action. 20 that point a circuit through the other electrically What I claim is: actuated means. 9. The combination with a snap switch com l. A switch comprising a thin strip of prising a resilient strip anchored at a point in resilient metal, means for anchoring said strip termediate its ends and being transversely de to a ?xed support at one point, said strip having a deformed, laterally oiiset area immediately 25 formed in the region surrounding said anchorage, of a pair of thermostatic elements having free adjacent said anchoring means, and a circuit ends adjacent and opposite each other, a heating controlling contact associated with said strip. winding on each of said elements, a pair of con 2. A snap switch comprising a thin strip? of tacts to each of which one end of one of said resilient metal, means for anchoring said strip to a ?xed support at one point, said strip hav 30 windings is connected, one end of said strip be ing disposed between and adapted to be engaged ing a deformed, laterally offset area surround and moved by the free end of either one of said ing said anchoring means, and a circuit-control elements, and the other end of said strip being ling contact associated with said strip. positioned to play between and alternately en 3. A snap switch comprising a thin strip of resilient metal, means for anchoring said strip 35 gage said contacts, and said switch forming a part of the circuit of said heating windings, to a ?xed support at a point intermediate its ends, whereby when the ?rst mentioned end is moved said strip having a deformed, offset area imme laterally by one of said electrically actuated diately adjacent said anchoring means, a circuit means beyond a certain position, the other end controlling contact near one end of said strip, and means for moving the other end of said 40 moves in the same direction with a snap action, thereby disengaging one of said contacts and strip laterally. breaking the circuit through one electrically ac 4. A snap switch comprising a thin strip of resilient metal, means for anchoring said strip tuated means, and engaging the other contact to a ?xed support at a point intermediate its and establishing at that point a circuit through ends, said strip having a deformed, offset area the other electrically actuated means. immediately adjacent said anchoring means at 10. The combination with a snap switch com both sides thereof, a circuit-controlling contact prising a resilient strip anchored at a point in arranged to co-operate with one end of said strip, termediate its ends and being transversely de and means for moving the other end of said strip formed in the region surrounding said anchor 50 age, of a pair of thermostatic elements having laterally. 5. A snap switch comprising a thin strip of re free ends adjacent and opposite each other, a silient metal, means for anchoring said strip to heating winding on each of said elements, a pair a ?xed support at a point intermediate its ends, of contacts to each of which one end of one of means for moving one end of said strip laterally, said windings is connected, one end of said strip means whereby such movement causes the oppo 55 being disposed between and adapted to be en site end of said strip to move in the same direc~ gaged and moved by the free end of either one tion, and a circuit-controlling contact arranged of said elements, and the other end of said strip be to be engaged by said strip. ing positioned to play between and alternately en gage said contacts, and said switch forming a part resilient metal, means for anchoring said strip 60 of the circuit of said heating windings, whereby to a ?xed support at a point intermediate its ends, when the ?rst mentioned end is moved laterally 6. A snap switch comprising a thin strip of means for moving one end of said strip laterally, means whereby such movement causes the op posite end of said strip to move in the same di by one of said electrically actuated means beyond a certain position, the other end moves in the same direction with a snap action, thereby disen rection, and a circuit-controlling contact arranged 65 gaging one of said contacts and breaking the cir to be engaged by said opposite end of said strip. cuit through one electrically actuated means, and '7. The combination with a snap switch com engaging the other contact and establishing at prising a resilient strip anchored at a point in that point a circuit through the other electrically termediate its ends, and having a deformed por actuated means, and an additional independent tion adjacent the point of anchorage, of electri cally actuated means for moving one end of said strip laterally, and a contact arranged to be en gaged by the other end of said strip for control ling the circuit of said electrically actuated means. pair of contacts constructed and arranged to be opened and closed by the lateral movements of said strip. ROBERT J. MCFALL.