Патент USA US2404976код для вставки
July 39f1946- P. J. MccULLoUGH ET AL 2,404,976 AUTOMATIC TOASTER Filed May l2, „1943 2 Sheets-Sheet 1 __'il __ FIGZ. l INvENToRsz PAUL J. MclggLLouGl-a CHARLES .TauaER W Q3 \ FIGA. Byßxïß‘ñ ToRN Y ~ AUTOMÀTI G TOAS TER Filed „may 12, 1943 @BAUL CHARLES J. Ms; @Um WG9. 4 u Patented July 30, 1946 2,404,97i5 UNITED STATES PATENT OFFICE 2,404,976 AUTOMATIC TOASTER Paul J. McCullough and Charles H. Steuber, St. Louis, Mo., assignors to .L'oseph Pavelka, St. Louis, Mo. Application May 12, 1943, Serial No. 486.641 3 Claims. 1 The invention relates to automatic electric toasters of the general type illustrated and de scribed in McCullough Patent No. 2,253,637, is sued August 26, 1941, and consists in all the novel features of construction referred to below. One of the objects of the invention is to sim plify the assembly of the timing mechanism with the toasting chambers and toaster frame or cas ing so that the timing mechanism may be con structed as a relatively small unit which may be (Cl. 99-328) 2 tion of View of Figures 3 and 4, and illustrating the timing mechanism and showing the parts in the normal inoperative position. Figure 7 corresponds to Figure 6 which shows the parts in a position assumed at the beginning of a toasting operation. Figure 8 is a detail horizontal section and View taken on the line 8_8 of Figurel 5. Figure 9 is a detail View taken approximately on the line 9~9 of Figure 5. Figure 10 is a detail front elevation of the structure shown in Figures 1 and 2 and is drawn readily installed, removed and replaced without disassembling many parts of the machine. A similar object of the invention is to facilitate on a smaller scale. the assembly and application of heater units in The toaster body or casing is of sheet material dependently of the timing mechanism and with 15 of substantial thickness and includes a front Wall out disconnecting a plurality of wires or other I, a rear wall 2, and end Walls 3, only one of parts. which is shown. These walls are substantially Another object of the invention is to provide continuous and comprise the frame upon which for accurate adjustment of the timing period by the remaining parts are mounted. A pan-like directly limiting the movement of a clock wind top cover 4 nts over the casing and is detachably ing member, as distinguished from the limitation secured thereto by readily removable screws 4a. of an intermediate member actuating the clock A bottom cover 5 is detachably secured to the winding member which leaves the clock winding casing by screws 'da and angle clips 6 and is member free to move by its own momentum to a provided with offset straps ‘I to which support greater extent than indicated by the adjustable 25 ing feet 8 are attached. The bottom cover is stop. provided with louvers 9 to facilitate ventilation. Another object of the invention is to provide An upright partition I0 extends longitudinally thermostatic control for the toasting period in of the casing from end to end and is spaced in which the thermostat will be free of a Weight or wardly from the front wall I. It is secured to load tending to hamper its movement or to give 30 the end walls by bolts 3a. Upright partitions II it a permanent set. extend transversely of and between wall 2 and These and other detail objects of the inven partition I3. A horizontal bottom partition I2 tion as will appear from the following descrip extends from end to end of the toaster and from tion are attained by the structure illustrated in partition I0 to rear wall 2. Members I0 and II the accompanying drawings, in which 35 form the sides and front walls of a plurality of Figure 1 is a vertical longitudinal section toasting compartments each of which is provided through one end of the toaster. with a pair of electric resistance heating ele Figure 2 is a top View of the structure shown ments H positioned adjacent to but spaced slight in Figure 1, the casing top cover being removed ly from the respective partition walls II. Hori and some of the parts sectioned for clearer illustration. Figure 3 is a vertical longitudinal section taken approximately on the line 3-3 of Figure 2 and indicating part of the timing unit and the asso ciated thermostat control thereof when the de vice is cold. Figure 4 is a similar illustration showing the thermostat control in a position assumed when heated. zontal angular strips I3 on each partition II space the heating element from the surface of the partition. Member I2 forms the bottom of the compartments and is slotted at S between each pair of heaters to provide circulation of air between them. Each element H is of familiar construction comprising sheets of mica with resistance wires mounted thereon. The elements are seated in slotted clips Iiia, secured to partition I0, and Figure 5 is a vertical transverse section taken 50 I2a, secured to partition I2. The upright rear approximately on the line 5--5 of Figure 2 and edge of each heater element is positioned by illustrating the timing mechanism. vertical ñanges Mr'. on a member I4 secured to Figure 6 is a vertical longitudinal section taken rear wall 2 and having a top flange Mb through approximately on the line 6_6 of Figure 2, i. e. 'which a screw I5 is threaded. An obtuse angle looking at the opposite direction from the direc- 55 clip I6 has one end bearing against the under 2,404,976 4 side of flange I4b and may be drawn up by tightening screw I5 so that its other leg engages a terminal of the adjacent heating element and thrusts it against flange I4a. An electrical con nection I7 extends between flange |41) and the corresponding flange of an associated member with. The disc connection of the clock escape ment to the winding bar is described in detail in compartments and cooperates with the four heat @-8 and member 28, Vwhereupon spring 21 imme diately raises carriage 24 and the parts mounted McCullough Patent 2,302,131, issued November 17, 1942. When handle Il!! is depressed and car rier Z4, member 28 and slice bars 32 are moved downwardly (Figure '7) , hook 48 projects through a slot 48 therefor in the web of member 28 to I4 mounting the .adjacent heater element. Cer hold the vlatter to the clockwork mechanism tain flanges I4?) are connected by wiring to the against the pull of spring 2l'. At the same time, toasting bus bars and complete the electrical shoulder 54 on bar 4@ is engaged by the lower it) circuit, but these details are not included in the face of member 28 so that further downward present application. The heads of screws l5 are movement of member 28 forces bar 45 downward readily accessible when the top cover .4 is >re 1y rotating ratchet disc 45 in an anticlockwise moved and upon loosening these screws .and .clips direction. .Spring 58 thrusts member 47 clock IS, the heating element is readily withdrawn for wlse. inspection, repair or replacement. Guard wires As disc 45 rotates in a clockwise direction, unn 31 extend alongside but are spaced from heating der control of the clock mechanism, and bar 45. elements H and are suspended from a U-shaped members 4'! and 28, slice bars 32 and carriage 24 frame I8, each leg of which overlies one -of the rise, tail 5l of latch trip member 41 projecting heating elements and the cross bar of which is from member 47 approaches the lower end of an secured by a screw I8a to a clip 2a projecting ~ larm 53 pivoted at 54 on an angle vstrip ’55 adjust upwardly from the rear wall. A dat plate lsb ably secured by screws 55 to wall I!) (see Figures ñanged at its upper end is slidable in opposing 3 and Li). After tail 5I engages the lower end grooves in the legs of member I8 and forms the of arm 53, further upward movement of member rear wall `of the toasting compartment. Toasting unita-_A single slice Icarrying and . 4l causes rotation of the member about its pivot on bar 45 resulting in the disengagement of latch timing unit is provided for two adjacent toasting ing elements H therein. ‘Each unit is mounted in the casing so that it may be readily removed thereon to their uppermost position, as indicated in Figure 5. The end of the upward movement cf carriage 24 is cushioned by springs 51 com pressed between flanges 2I and 25. Spring 59 linked to arm 46 continues the unwinding of ’the clockwork so that arm 45 eventually returns to for inspection, repair and replacement. Each unit includes an upright mounting member 20 detachably secured to front wall I by screws I9 and has an inturned upper flange 2I and a lower flange 22. Rods. 23 are secured at their upper and lower edges to flanges 2| and 22 and a carrier its highest position. Thermostatic control.---As is well known in the plate 24 has inturned upper and lower flanges 25 and 26 apertured to receive rods 23 so as to slide vertically on the latter. Carrier Y24 is biased to an elevated position by a coil spring 21 hooked at its opposite ends to flanges 2I and 26 `respec toaster art, the toasting period may be shortened after the cold toaster parts have been heated by one or more successive >toasting operations and, 40 to automatically shorten later successive toasting tively. A Z-shaped bracket 28 (Figures 5, 6 and ’7) has >an upper outerii‘ange 28 secured to carrier 24 and a lower inner ñange '38 adjacent to parti tion wall I0 and provided with a pair of hori Vzontal slots 3 I. Slice supporting bars 32, one in each compartment, are mounted upon the legs 33 of a U-shaped yoke (Figure 8) extending `through lslots, 35 in wall I0. The yoke cross bar 34 is provided with headed studs 35 extending 50 through slots 3| in bracket flange 30 and support the yoke and slice bars so they may move freely transversely of the unit and the toasting com partments. This arrangement readily eccom modaites variations in the assembly of the toaster parts and particularly in the alignment -of the heating units, the heating elements, their guard periods, it is customary to modify the timing mechanism by a thermostat. In the present structure, a thermostat device is associated with arm 53 for this purpose. The novel features of this thermostat-and associated structure lform the subject matter of a divisional application filed November 23, 1945, Serial No. 630,487. The transverse partition I2 nearest the end ofthe 'toaster has an elongated opening 6D. A spacer and heat conducting member 6I extends abreast of slot E!) and its ends are secured to partition l! beyond the ends of opening @Il but its inter mediate portion Vis offset from partition II. The voiiset portion contacts the mica of the adjacent heating element H and hence its temperature corresponds more closely to that of the heater than does the temperature of the partition. A bimetal thermostat bar 62 is secured at its inner end 62a to strip E'l. When bar d2 is cold, it wires 37 and the slots 36 in wall I8 through which the legs 33 of the yoke slide, Each carrier 24 with the parts thereon is ma 60 -assumes the substantially straight full-line posi tion at the inner side of partition l I and against nipulated manually by a handle 48 mounted on strip el, as indicated-in Figure 2. When the bar an arm. 4I which extends through a slot la in is heated, it deflects towards the broken line posi front wall I and also through a slot 280; in tion, moving through opening 68 to the outer mounting plate 28 and through an opening 24a in carrier 2 . The portion of the arm. passing through carrier 24 is notched at 43 to engage opposite sides of carrier ‘24 and is pivotally sup ported on carrier 24 >by a notched portion of ñange 29 of bracket 28. Vside of partition H. A flat spring 64 is secured at one end tothe lower end of arm 53 and is connected at its ‘upper end by a link 53 to an extension B2b on the movable end of thermostat 82. Spring E4 is Timing mechanism-A Iclockwork escapernent 70 4stiiî enough to move arm 53 in accordance with mechanism is indicated generally at C, the main gear wheel 44 being driven by a ratchet disc 45 which may be connected by an L-shaped winding bar 48 and a trip latch member 4'I pivotedthere on to member 28 and the parts associated there 75 >the movement of the swinging end of thermostat 52 unless movement of arm 53 is resisted by ’its engagement with tail 5I, in which case spring '64 willyield to accommodate the deflection ofthe thermostat. 2,404,976 5 6 As a. substantial portion of thermostat bar 62 moves through the restricted aperture 60 in the right hand partition Il, it is subject to the tem perature of the air in the space between partition I l and the adjacent end Wall 3 of the casing and such a result because the winding arm itself directly contacts the stop. By placing control knob 70 and its cam and stop flange 13 at one side of handle arm 4| and the winding arm shoulder 'I3 beneath the handle arm and the clockwork at the other side of the handle arm, these parts are balanced on the removable unit and the knob "id does not interfere with move ment of handle 4S. the warmer the air in this space the more rapidly the thermostat and bar 53 will be moved to the right (Figures 2, 3 and 4) and the shorter will be the toasting period. During the first few closely successive toasting operations initiated 10 when the toaster is cold, the air in the space between the partition and the end of the toaster will check the movement of the thermostat to the right and prolong the toasting operation ac cordingly. Hence the thermostat tends to main tain a substantially uniform degree of toasting for a given setting irrespective of whether the Manual termination of toasting operation. irrespective of the manual adjustment for dark or light toast just described or the control of the toasting operation by the thermostat as previously described, it may be desirable to inter rupt or to terminate the toasting operation at any time manually and this is accomplished by extending handle arm 4| into the plane of latch t8, as indicated at 4ta (Figures 5 and 7). When toasting operation is an isolated one or one of several closely successive operations. members e8 and 28 are engaged, as shown in Figure 7, and handle 4i? is raised manually so as to tilt about its pivotal support on flange 29, its extension 4in will move downwardly, thrust The lower end of arm 53 1s slotted to receive the upper portion of a clip 65 to guide the move ment of the arm. The outer end of this clip is flanged at 66 to form a stop limiting the move ment of arm 53 to the right so that it will not ing latch 4S to the left (Figure 7) to disengage bracket 22 and permit spring 21 to raise carriage interfere with other adjacent toaster parts. If, 25 24 and slice bars 32 and projecting the toast so due to carelessness, switch control failure, an it may be removed. This release of latch 48 may intentional exhaustive test, or other unusual cir be operated for the purpose of inspecting the cumstances, the thermostat is subject to such a toast, and the handle carrier 24 and the slice high temperature that it tends to move beyond bars may be lowered immediately afterwards to the position shown in full lines in Figure 4, such 30 again engage latch 48 and bracket 28 but With movement is accommodated by deflection of out applying suilicient pressure to overcome spring 64 after arm 53 engages stop 66. The spring 59 between arm 46 and iiange 2l as would yielding connection between the thermostat and be necessary to rewind the clock. Hence the the arm avoids the thermostat taking a perma toasting operation may proceed from the point nent set as would result if there were no yielding 35 interrupted by the manual tripping of latch connection. 48 without substantially affecting the toasting period. Adjustment of timing period.--It is customary in toasters of this general type to provide selec tive means for varying the length of the toasting An arm 'I9 on carrier 24 is connected to a toasting operation is controlled by the position 60 switch 8€! which controls the heater circuit, and it will be understood that lowering of handle 40 and carrier 24 closes switch 80 and that the switch is opened when the carrier is raised whether by the timing mechanism or manually. The details of the switch and its control do not constitute the present invention and may be varied without aiîecting the other arrangements described. The toaster front wall l has a horizontal slot 8| for receiving a crumb tray 82 and partition EU is similarly slotted at 83 for the crumb tray. The crumb tray has a slot S’ in line with the slot S in bottom partition I2 to permit `ventila tion of the toasting chamber. The structure illustrated and described pro vides a simple, eiîective and durable construc tion which is readily manufactured and in which the toasting periods are readily controlled and the timing units and heating units are readily removed and replaced independently of each other and without disassembly of any of the body of slide 14. The direct engagement of the clock winding arm 45 by a manually adjustable stop walls or framing. The details of the construction may be varied operation so as to produce light, medium or dark 40 toast as desired. Such adjustment is provided in the present device by a manually operated knob 10 mounted on a shaft 'H journalled in the casing front wall and carrying a cam 12 on its inner end positioned in the path of move 45 ment of a horizontal flange T3 on a slide 14 slidably mounted on plate 2Q, slide 14 having vertical slots 15 receiving headed studs 15 on plate 2Q to slidably mount member 'I4 on plate 29. A flange 'Il on the lower end of slide 'I4 50 projects beneath a shoulder 18 on arm 46 and forms a stop for the latter when handle 40 and the parts associated therewith are lowered. Ob viously, the position of cam l2 controls the height of slide 14 and thereby limits the downward 55 movement of arm 46 and carrier 24 when a toast ing operation is initiated. Hence the period elapsing before the return movement causes the release of latch 48` and the termination of the possesses an advantage over the previous adjust substantially Without departing from the spirit ment stop arrangement of McCullough Patent of the invention and the exclusive use of such 65 No. 2,253,637, issued August 26, 1941, in which modifications as come within the scope of the a part corresponding to carrier 24 is engaged by claims is contemplated. an adjustable stop. It has been found that a What is claimed is: quick, forceful, downward thrust on the carrier may cause some momentum in the clock winding arm resulting in the arm moving downwardly l. In a toaster, a casing including a toasting compartment, a heater therein, a slice support, means for moving said support from an elevated after the carrier contacts with the stop, Accord ingly, the timing period would be lengthened and non-toasting position to a lower toasting position and return, a clockwork escapement mechanism there would be no assurance of the desired degree for controlling the return movement of said sup of toast being produced, particularly if light toast port and the toasting period, an arm pivoted at were desired. The present arrangement avoids 75 one end on the casing and movable at its other 2,404,975 7 yend to lform kan adjustable stop-to limit ‘the clock controlled .movement of the support, a thermo- stat .subject to the temperature in the toasting compartment, and a connection between said thermostat and arm vfor movingthe latter about >its pivot, said connection normally causing the :arm to follow the movement of thethermostat but being constructed to yield to accommodate rela tive movement of the thermostat and arm if the latter is held against movement. 2. In Va toaster, a casing including a toasting compartment, a heater therein, a slice support, .means for'moving said support from an elevated non-'toasting position to a lower toasting position and return, a clockwork escapement mechanism , for ‘controlling the return movement of said sup port and the toasting period, there being inter -engaging latch elements on the mechanism and the support 4movable with the support, one of said ~’elements having an elongated tail inclined vto the .path of movement of the elements and by which «it ymay be tilted to disengage-the latch elements, ran `arm pivoted Aat one end on the casing and movable at `its lother end lengthwise o'f said. tail Ito engage the latter at 'different points in the S upward movement of the yelements and forming an adjustable -stop for limiting ythe return move mentcf the support and to vary the toasting Vop eration, a thermostat subject to the `temperature in the >toasting compartment, and a connection between said .thermostat and arm -for moving the latter about -its pivot, said connection being re silient‘to accommodatemovement of the thermo» stat without stressing the latter when the arm is held' against pivotalmovement. 3. In a toaster, a framework, a ktoasting com partment provided with a heater, a timing vmech anism including a Y»part movable relative to the framework, an adjustable stop associated with the framework and arranged -to ‘coact with said part to `'terminate the toasting operati-on, a thermostat subject to the temperature in the toasting com partment, and a connection-between said thermo stat and stop for adjusting the latter, said con nection being constructed to yield to accom modate movement >of the thermostat relative to -the stop if the latter «is held against adjusting movement. PAUL J. MCCULLOUGH. CHARLES H. STEUBER.