DE2149893A1 - Thermostat device and its application to control and regulation systems of stoves - Google Patents

Description

V AT Π B. _ιΝ , _ΪΛ τ, τ DIPL. ING. UQ 2LUTiIjER • "ίΐ> Λ 3 η ΐ.τ i: α »HIUU'PIN» - WELEKU - STiIAHSB t * UOFOX Γ. »1873

Augsburg, October 6, 1971

Robertshaw Controls Company, 1701 Byrd Avenue, Richmond,

Virginia, V.St.A.

Thermostat device and application of the same to control and Control systems of herds

The invention relates to a thermostat device and the Application of the same to control and regulation systems of stoves.

There are already several thermostatic devices for stoves are known that allow an operator to both Kpcht Temperatures as well as a high temperature for one

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Switch on the burn-off regulation process. However, these known thermostatic devices usually for the Control of the usual cooking process and control of the high temperature burn-off cleaning process two separate heat sensitive devices.

The invention is intended to solve the problem with a thermostat device of the type mentioned instead of with two separate thermally responsive devices with only a single such device are the same To achieve control and regulation options and in particular with only a single, responsive to heat Device both normal cooking or roasting or baking processes as well as those taking place at high temperature To be able to control and regulate burn-off cleaning processes.

The thermostat device according to the invention can of course also be used for any control systems Can only be used for normal cooking processes and the like.

The stated object is achieved according to the invention solved by a housing, furthermore by a winding one

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Tube with two preferably oppositely facing ends, one end of which is fastened to the housing and the other end is movable relative to said one end, further through a connected to the pipe, temperature sensor filled with fluid, with expansions caused by the action of heat and contractions of the one located in the temperature sensor Fluid cause corresponding movements of the said other pipe end with respect to the housing, furthermore by two contact pieces carried by the housing of a pair of contact pieces, which are normally attached to each other are applied and are in electrical contact with one another, further by control means carried by the housing for the optional setting of one of the two contact pieces relative to the housing in a particular one Position, and finally by means attached to the said other pipe end, which are attached to the relevant other of the said two contact pieces can apply in such a way that this other contact piece in the direction is moved away from the aforementioned one contact piece when the temperature sensor detects a certain temperature, the setting of the control means determining the temperature to be perceived at which the pipe in each case the said two contact pieces moved away from each other.

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The invention requires the thermostat device just a single temperature-responsive device to control a variety of processes. The thermostat device according to the invention can, for example can be used in connection with stove control or regulation systems, with further contact pieces of the most varied Can control the processes of a stove, for example a burn-off cleaning process that takes place at high temperatures, further a locking device of the oven door, low temperature operations, etc., and wherein said tube the mentioned further contact pieces also operated in the manner described above.

An embodiment of the invention is shown in the drawings and will be described in more detail below described. Show it:

Fig. 1 is a broken away front view

a thermostat device according to the invention,

Fig. 2 shows a reference to Pig. I enlarged

Representation of the thermostat device according to the invention, with a control button

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it is omitted,

Pig. 5 one of the pig. 2 similar view

of the thermostat device according to the invention with the cover removed,

Pig. 4 a schematic longitudinal section

the level 4-4 in Fig. 2,

Fig. 5 is a reduced rear view of the

in Pig. 2 shown thermostat device according to the invention,

Pig. 6 is an exploded perspective

Representation of the in Pig. 2 shown thermostat device according to the invention,

Fig. 7 is a broken sectional view

of the thermostat device according to the invention essentially along the 7-7 plane in Pig. 5, and

Pig. 8 is a circuit diagram of an inventive Cooker control system with a

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Thermostatic device according to the invention.

While the various features of the invention hereinafter with reference to the drawings as particularly suitable for controlling cooking processes and at high Describing temperature burn-off cleaning processes of household stoves and the like, it is clear that these various features of the invention individually or in any combination in conjunction with other devices or systems can be used.

The invention is therefore not limited to the embodiment shown in the drawings, but this represents only one particular type of application from the multitude of possible applications of the invention.

The following is referred to the Pig. I to 7 reference, in which a thermostat device 10 according to the invention is shown, which has a housing 11 with a front plate or a cover, a back plate 1J> and a housing middle part 14, the open ends 15 and 16 facing away from each other through the two plates 12 and 13 are closed, which are attached to the housing middle part in FIG

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Way are fastened with screws 17. The front plate 12 is provided with two hook-like bends 18,
which extend over corner recesses 19 of the middle part of the housing and hold the upper part of the front plate 12 with reference to the drawings on the middle part 14, while the lower end of the front plate 12 with reference to the drawings with screws 17 received by openings 20 of the middle part of the housing on this middle part 14 are attached. The back plate 13 is fastened to the housing middle part 14 by two screws 17 which are screwed in the same way into threaded bores (not shown) in the housing middle part 14.

The plates 12 and 15 form together with the
Housing middle part 14 in the housing 11 a chamber 21,
in which a coiled tube 22 of the invention is received,

The coiled tube 22 has an exterior attached to the back plate 13 by, for example, spot welding
End 23 and an end 24 lying within the spiral given by the tube 22, the latter being in
Dependence on expansions and contractions of fluid in tube 22 relative to the housing

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can move, the tube 22 being connected to a temperature sensor 25 via a capillary tube. Since the erfindungsgonäße thermostat unit is capable of 10 to control deflagration cleaning processes which proceed at high temperatures of about 540 ⁰ C, the temperature sensor 26 and the tube 22 are filled with helium, which can withstand such high temperatures and running both at high temperature Processes as well as cooking processes running at low temperature can each precisely control, as can be seen below.

The movable inner end 24 of the tube 22 has two opposite sides 27 and 28, which provided with outwardly projecting pivot bearing pins 29 are mounted in openings 30 of two legs 31 and a U-shaped element 33. the Legs 31 and 33 embrace the twisted Tube 22 formed spiral completely, wherein the web 34 of the U-shaped element 33 is spaced over the outermost turn of the tube 22 extends away and with expansions and contractions of the temperature sensor 25 and the fluid located in the pipe 22, the pipe 22 winds up or unwinds and thereby the U-shaped member 33 with respect to the housing

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moved forwards or backwards.

An electrically insulating cross bar 35 is attached to the web ~ $ K of the U-shaped element 33 by an S-shaped element 36, which on the one hand with rivets 37 on the rod 35 and on the other hand with rivets 38 on the web 34 of the U-shaped element 33 is riveted. The S-shaped element 36 consists of a bimetal and is used to compensate for ambient temperatures acting on the tube 22.

Around the temperature sensor 25 and the pipe 22 initially To be able to fill with said helium, is parallel to the tube in the manner shown in FIG. 6 Capillary tube 26 connected to a flushing line 39, so that helium as long as in the tube 22 and consequently also in the temperature sensor 25 can be driven until these parts in the required manner with helium are filled, after which the flushing line can be closed in any way.

The capillary tube 26 and the flushing line 39 are attached to the outside of the rear plate 13 with a clamp 9

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attached, the clamp 9 is screwed tight with the screws 17, which are used at the same time to attach the back plate IJ> to the housing middle part 14.

The front plate 12 of the thermostat device 10 carries an internally threaded bushing 40 into which a threaded part 41 of a control spindle 42 with a C-shaped cross-section is screwed, which protrudes through a corresponding opening in the oven frame construction 4j5 in the manner shown in FIG an operating knob 44 for rotating the control spindle 42 is provided. Together with the control spindle 42, its threaded part 41 also rotates relative to the housing 11, so that the threaded part 41 is moved axially within the stationary bushing. The threaded portion 41 is provided with an axial bore whose left with reference to Fig. 4 end is provided with an internal thread into which an adjusting screw is screwed 47, one end 47 ^f located within the right with reference to Fig. 4, not with a threaded part of the bore 45 is located and rests against an electrically insulating pin 48, the free end of which, depending on the axial setting of the threaded part within the stationary socket 40, more or less. protrudes into the chamber 21 of the housing 11.

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A bridge element 50 is on the with an internal thread provided socket 40 and has ears 51 and 52 facing away from each other with openings 55 to Attachment of the thermostat device 10 to a corresponding structure, for example to the stove frame structure a household cooker or the like. The thermostat device 10, for example, on the control panel of the cooker can be attached, as shown in FIG. The bridge element 50 is bent inwards Fishing 5 4 · provided, which act as limit stops serve the rotary movement of the control spindle 42, since the control spindle 42 is a disk 55 with an outward directed nose 56 carries, the latter with reference to FIGS. 2 and 6 each to the upper side of the tang of the bridge element 50 applies when the control spindle 42 is brought into its "off" position, while the nose 56 abuts the lower side of the tang 54 when the control spindle 42 has been set to a highest temperature.

It can thus be seen that when the control spindle is in its "off" position shown in FIGS was brought, the thereby actuated pin 48 protrudes furthest into the chamber 21 of the housing 11, while when

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the control button 44 corresponding to Pig. I clockwise is moved from its illustrated "off" position to a position corresponding to a higher temperature, the Threaded part 41 is moved to the left with reference to FIG. 4, so that the pin 48 then the least far into the chamber 21 of the housing for a purpose to be described below protrudes.

To give the operator a "feel" for the respective A curved leaf spring 57 provides the position of the control spindle 42 relative to the thermostat device 10 between the bridge element 50 and the disc 55 of the Control spindle 42 arranged such that this curved leaf spring 57 of the respective rotary movement of the control spindle opposed to a frictional resistance relative to the housing 11, by which one for the rotation of the control spindle 44 relative to the control panel 45 is given the said "feeling".

Two contact pieces 58 and 59 of a contact piece pair are on the one hand firmly connected to the housing 11 and on the other hand form with their contacts 62 and 63 having free ends 60 and 61 a switch to complete a corresponding circuit. With reference to Fig. and 6 upper contact piece 58 can best be seen from FIG. 3 and has an essentially rectangular part 64

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a rectangular cutout 65, the rectangular part 64 being provided with an extension 66 which extends rearwardly from an upper part 67 of the part 64 and between a rear wall part 68 of the housing middle part 14 and a U-shaped section 69 of an electrical connection 70 is inserted and thereby connected to the housing 11. A lower end of the contact piece 58 with reference to FIG. J5 can move around a joint part 67 of this contact piece 58 relative to the housing 11 in a manner to be described below. The connector 70 protrudes through one in the rear. Wall 68 of the housing middle part 14 out of the housing so that an electrical line can be connected to it in a manner to be described below. The U-shaped section 69 of the connection 70 has an inner part 72 which is accommodated in a suitable slot 75 on the rear wall 68 of the housing middle part 14. The connector 70 is in the slot 71 of the wall 68 by suitable, splayed prongs 74 in the Pig. 4 attached manner shown. The extension 66 of the switching piece 58 can thus, if it is accommodated in the slot according to FIG. 3 formed between the U-shaped section 69 of the connection 70 and the rear wall 68 of the housing 11, be fastened to the section 69 by spot welding,

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in order to thereby achieve a positive fastening and positive electrical connection between the electrical connection and the contact piece 58 to produce.

The contact 62 of the contact piece 58 is corresponding to Pig. 3 offset to the right and thus works with the free end 6l of the contact piece 59 together, whose lower end 75 with reference to the drawings through a U-shaped portion 69A of another electrical connection 76 of the thermostat device 10 is attached to the housing 11 in a manner similar to that of the terminal 70.

The switching piece 59 has a natural spring force through which its movable end 6l according to FIG. 4 is pushed to the contact piece 58, and between this Switching piece 58 and the rear wall 68 of the housing middle part 14, a compression spring 77 is used, which the contact piece 58 urges to the contact piece 59, so that the contact pieces 58 and 59 normally keep their contacts 62 and 63 in contact with one another.

The cross bar 35 of the tube 22 of the thermostat device 10

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it's so. arranged that he is on the switching piece 59 under the contact piece 58 and can move it away from the contact piece 58 to thereby the two Sehaltteile 59 and 58 to separate from each other when the temperature perceived by the temperature sensor 25 accordingly increases and as a result of the expansion of the fluid in the pipe, this pipe changes accordingly unwinds. However, the contact piece 58 initially follows the Movement of the contact piece 59 * because the force of the compression spring the contact piece 58 with reference to FIG. 4 to the left tried to move.

However, the size of the pin 48 adjusted accordingly by the control knob 44 is set with With reference to FIG. 4, movement of the Sohaltstückes 58 to the left is limited, since the end 49 of the pin is in the path of movement of the contact piece 58. Accordingly, it can be seen that the setting of the Control button 44 to a desired temperature causes the contact pieces 58 and 59 each so long remain in electrical contact with each other until the temperature sensed by the temperature sensor 25 is below the

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the temperature set with the setting knob 44 has fallen, and the contact pieces 58 and 59, respectively then open when the temperature sensed by the temperature sensor 25 is above that of the setting knob 44 set temperature. In this way, the pair of contact pieces 58, 59, for example, a conventional Control the baking process in a household stove or the like, as will be described in detail below.

The two switching pieces 77 and 78 of a further pair of switching pieces carried by the housing 11 are each with one end 79 and 80 at U-shaped sections 69B and 69c of electrical connections 81 and 82 in this way attached that their free ends 83 and 84 together one Form electrical switches, via which the circuit lying between the terminals 8l and 82 is closed is when these free ends 83 and 84 of the switching pieces and 78 rest against one another. That with reference to the drawings lower contact piece 78 is in the path of movement of the cross bar 35 of the tube 22, so that in each case at a certain perceived temperature this cross bar 35 the contact piece 78 away from the contact piece 77-

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moves because the natural spring force of the contact piece is directed towards the contact piece 77 and the Position of the contact piece 77 with respect to the middle part of the housing 14 is determined by an adjusting screw 85, the latter in a threaded hole 86 of a rear Wall 68 of the housing middle part 14 is screwed in, the natural spring force of the contact piece 77 is directed in the direction of the rear wall 68 of the housing middle part. Closing takes place as a result and open the contact pieces 77 and 78 as a function of the position of the adjusting screws 85 each at a certain perceived temperature, so that the Switching piece pair 77, 78 a non-cooking and keeping warm process of the cooker in question in a manner to be described below.

Two Sehaltteile 87 and 88 of a third of the housing 11 worn contact pair are with their one ends 89 and 90 each by U-shaped Sections 69D and 69E of electrical connections 91 and 92 attached to the housing 11 such that

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the free ends 93 and 94 of the contact pieces 87 and 88 cooperate in the sense of an electrical switch connection between the connections 9I and 92. The transverse rod 55 is located in the movement path of the contact piece 88 of the tube 22, so that the natural, in the direction of the contact piece 87 directed spring force of the Switching piece 88 can be overcome by the transverse rod 35 and thereby the contact connection between the contact pieces 87 and 88 can be interrupted when the temperature sensor 25 senses a certain temperature will. The switching piece 87 has a natural spring force in the direction of the rear wall 68 and its position is determined by the respective setting of the adjusting screw 85A in the same way as with above With respect to the set screw 85 has been described. The switching pieces 87 and 88 can accordingly be a high temperature burn-off cleaning process of the cooker 4j5 in a manner to be described in detail below.

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The two contact pieces 95 and 96 of a fourth pair of contact pieces carried by the housing 11 are fastened with their one ends 97 and 98 respectively by U-shaped sections 69F and 69G of electrical connections 99 and 100 to the rear wall 68 of the housing middle part 14 in such a way that the free ends 101 and 102 of these switching pieces 95 and cooperate as a switch. The arrangement is such that the cross bar 35 can rest against the contact piece 96 and move away from the contact piece 95 when the temperature measured by the temperature sensor 25 reaches a certain value, the natural spring force of the contact piece directed towards the contact piece 95 96 is overcome. The switching piece 95 has a spring force directed in the direction of the rear wall 68 of the housing middle part 14 and its position is determined by the respective position of an adjusting screw 85D according to FIG. The switching pieces 95 and 96 can, for example, actuate a door locking device of the cooker 43 during a burn-off cleaning process, such as this

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is described in detail below.

Accordingly, it can be seen that the tube 22 over the insulating rod 35 at least four pairs of contact pieces 58, 59 or 77, 78 or 87, 88 or 95, 96 can control, the contact pieces of each contact piece pair perceived by the temperature sensor 25 in others Temperatures can be opened or closed, so that within the scope of the invention not only one improved thermostat device, but also an improved, automatic control and regulation system, for example for Herd 43 is given as described below.

The control system 103 according to the invention shown in FIG. 8 has two electrical power supply lines L and L ₂ for operating a baking heating element 104 and a roasting heating element 105 of the cooker 43. The line can be connected by a suitable selector switch 108 to one connection side 106 of the baking heating element 104 and / or to one side 107 of the roasting heating element 105, depending on whether the selector switch 108 is set to a baking process or a roasting process or a burning off.

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Cleaning process is set, in which latter case the line L _{1 is connected} both to the baking heating element and to the frying heating element 105.

The thermostat device 10 according to the invention is shown schematically in FIG. 8 in dashed lines and has the cyclically moving main contact piece 59 and the adjustable contact piece that interacts with it Contact piece 58, furthermore the movable contact piece 78 and the adjustable contact piece 77> which interacts with this further the movable contact piece 88 and the adjustable and interacting therewith Switching piece 87 and finally the movable switching piece 96 and the adjustable and interacting therewith Switching piece 95, which parts are located in the control system 103 in the manner shown in FIG.

In detail, the movable contact piece 51 through its terminal 96 electrically to a line IO9 connected, which leads to the line L ^. The adjustable Switching piece 58 is via its connection 70 with a Line 110 connected, which leads to a switch 111 actuated by a timer. That from the timer

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actuated contact piece 111 can each come into contact with a stationary contact 112, which is connected to a line 113 is connected to the connection 100 of the movable contact piece 88.

The line 110 is also connected to the connection 82 of the movable contact piece 78 via a line 114 connected, while the adjustable contact piece 77 is connected to a line 115 via its connection 8l which leads to the line II3.

The adjustable switching piece 87 is connected via a connection 91 to a line Ho, which in turn to one connection side 117 of a small heating element II8 a thermal relay II9 is connected. The other The connection side 120 of the heating element II8 is connected to the power supply line L "via a line 121. That thermal relay 119 has a movable contact piece 122 made of bimetal, which is in each case against a stationary Contact 123 is moved into the closed position. When the heating element II8 is energized, so that then the line 121 with a line 124 has connection, which on the one hand to the fixed Contact 123 and on the other hand to the connection side 125 of the back heating element 104 is connected.

The connection side 120 of the heating element II8 of the

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Thermal relay 119 is also through a line 126 to one terminal side 127 of a heating element 128 of a further thermal relay 129 connected, the connection side 127 of the heating element 128 also via a Line 130 is connected to the connection side 117 of the heating element 118. The other side I3I of the heating element 128 is connected to the power supply line L. The thermal relay 129 shows one made of bimetal Switching piece 132, which can be moved against a fixed contact, which is connected to the connection side via a line 135 13 ^ of the frying heating element 105 is connected. That Switching piece 132 can only come into contact with the contact when the heating element 128 is energized.

The control system 103 is provided with a movable contact piece 136, which via a line 137 with the Power supply line L. is connected and normally with reference to a fixed contact I38 as long as one Assumes the open position, like a manually operated locking element of the oven door, whether or not it is locked in place assumes locked position. However, if the door lock wleiiient is moved into its locking position, the contact piece I36 is thereby attached to the fixed contact which is connected to the voter holder I08. Of the

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Selector switch 108 connects the fixed contact I38 to the line 116 when it is on a "cleaning position" is set for burn-off cleaning cycles.

The movable contact 96 of the thermostat device is connected via a connection 100 to a line l40, which leads to a fixed contact 141 which interacts with a normally in the open position contact 142 which is connected to the power supply line L via a line adjustable switching piece 95 of the thermostat device 10 has via its connection 99 with a line 144 connection which is connected to one side 145 of a solenoid coil 146, the other side 147 of which is grounded via a line. The coil 146, when energized, moves a lock pin out of engagement with a manually operable door lock lever so that the door lock lever can then be moved from its unlocked position to its locked position or from its locked position to its unlocked position. Both processes of the door locking element only take place when the coil 146 is energized, as will be described in detail below.

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The control system 103 according to the invention works as follows:

Assume that the operator is familiar with the control system 103 wants to undertake a conventional baking process on the stove 43, the selector switch 108 is set to a baking process adjust, whereby the power supply line L. only is connected to the connection side 106 of the back heating element 104. Because the timer is set to a "hand position" is, the switching piece 111 assumes its closed position, i.e. it rests on the contact 112. The operator sets the control knob 44 to a desired cooking temperature in each case as long as the temperature in the stove is below the one on the control knob set cooking value is because the contact piece 59 rests on the contact piece 58. Furthermore, since the contact piece 88 for the burn-off cleaning process that takes place at a high temperature is always applied to the contact piece 87 until the stove temperature is reached exceeds the burn-off cleaning temperature, the power supply line L. with the heating element II8 of the thermal relay 119 connected so that the heating element 118 with both power supply lines L. and L_ Connection has. The heating element 118 thus excited is heated the contact piece 122 made of bimetal, whereby

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this applies to the contact 123 and the power supply line L "connects to the side 125 of the baking heating element 104, so that the baking heating element 104 is also connected to both power supply lines L. and L and heats the stove to the desired baking temperature at which the heat then moves the contact piece 59 away from the contact piece 58 and thereby the connection of the heating element 118 to the power supply lines L and

1 L _{2 is} interrupted, which causes the contact piece to move into an open position and the connection of the heating element 104 to the power supply lines L and Lp is also interrupted.

In this way, the contact piece 59 moves periodically between its open and closed positions and it stops thereby the temperature prevailing in the oven at the cooking or baking temperature set on the control knob 44.

Such a baking process can be an automatically time-controlled bagging process, after which a selected baking time period the thermostat device 10 the Stove for so long on a low, non-baking oven

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Keeps warm temperature until the operator wishes to remove the food from the stove.

After completion of the baking process described above, which required a certain period of time, the timer moves the contact piece 111 away from the fixed contact 112 into its open position, as shown in Fig. 8 _? The only time that the power supply line L * can be connected to the line to actuate the thermal relay 119 is when the contact piece 78 rests against the contact piece 77, and the contact piece only then moves against the contact piece 77 and is applied to this, when the temperature prevailing in the oven, however, holding temperature has dropped, for example, 77 ⁰ C under a specific Nichtkoch-. At such a low temperature, the contact piece 59 is of course also in contact with the contact piece 58, so that the periodic opening and closing of the contact piece 78 keeps the temperature in the stove at a low value in accordance with the setting of the adjusting screw 85.

If the control system IO3 for a roasting or grilling process is used, the selector switch 108 is on

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a "roasting control" is set, the control knob 44 also being set in its roasting position (approximately 330 ° C.) is so that the frying heating element 105 to the power supply lines L. and L is connected when the contact piece of the thermal relay 129 is moved into the closed position by the heating element 12 8, the latter in the same rfeise connected to the power supply lines L. and L. is like the heating element 118 of the thermal relay 119 for the baking heating element 104, as described above became. The contact piece 59 moves periodically between his.Offen- and closed positions and thereby holds Cooker upright the desired frying temperature in the same way, as described above with reference to the baking process became.

when the operator with the control system 103 is performing a high temperature burn-off cleaning operation wishes to perform, the selector switch 108 is on is set to a "cleaning" position, the control knob 44 is also rotated to a stove-cleaning position and the timer, not shown, for actuating the contact piece 111 is set so that the contact piece 111 is applied to contact 112 for a desired burn-off period of time. The operator must also be momentary

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a switch 142 close, which energizes a solenoid 146 by being connected between the power supply line L ₁ and earth, since the contact piece is normally held in contact with the contact piece 95 until the temperature in the oven ^{exceeds 290 °} C., for example. By energizing the solenoid 146, the lock pin of the oven door is moved so that the operator can now move the oven door locking member from its unlocked position to its locked position. When the door locking element is now in the locking position, the switching piece I36 assumes its closed position, ie it rests against the fixed contact 138, whereby the power supply line L. is connected to the selector switch I08. The oven door is therefore locked before the selector switch 108 set to "cleaning" connects the power supply line L. to the timer-controlled contact piece 111. The operator lets go of the push button connected to the switching piece 142 again when the door locking element has been moved into its locking position, which de-energizes the solenoid 146 so that the locking pin now falls off and the door locking element remains in its locking position for so long

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holds until the solenoid 146 is re-energized, which of course is not possible if the oven temperature is not below 290 ⁰ _{C s} because when the oven temperature is above that, the transverse rod 35 of the tube 22 the contact piece 96 of the contact piece; 95 moves away so that the solenoid 146 can be energized at any time when the oven temperature is above 290 ⁰ C.

In this state, in which the contact piece 136 is applied to the contact 38 and the door locking element assumes its locking position, the switching piece 88 remains on the contact 87 in contact, so that the Power supply line L. with the heating elements 118 and of the thermal relays 119 and 129 has a connection and thereby the heating elements 104 and 105 to the two power supply lines L ^ and L "are connected and the stove on the heat required high temperature for the burn-off cleaning process, which when it reaches in the stove is, causes the transverse rod 35 to lie against the switching piece and this from the stationary switching piece 87 wes ™ moved, whereby the heating elements 104 and 105 are switched off until the temperature prevailing in the stove has again fallen below the aforementioned temperature determined by the setting of the adjusting screw 85A. That

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Switching piece 88 is therefore moved periodically through the pipe 22 between its open and closed positions, whereby it is the stove temperature for the burn-off cleaning process holds the required high V / ert.

The cleaning process is ended when the switching piece 111 is moved to its open position after the selected cleaning time has elapsed or the selector switch is brought to its "off" position, which prevents the heating elements 104 and 105 with their connection sides 106 from and 107 with the power supply line L. connection hubs. Here, the temperature in the stove begins to drop and, if it drops below 37 ° C, for example, the contact piece 96 rests against the contact piece 95 again through the pipe 22, whereby the operator can close the switch 142 again to close the solenoid 146 excite and withdraw the locking pin, so that the Turverrxegelungselement can be moved from its locking position to its unlocked position, whereby the switching piece 136 moves away from the contact 138 and thereby in its open position ^ eb avenge -.- fird.

It can thus be seen that the coiled tube 22

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of the thermostat device 10 according to the invention not only different pairs of contact pieces of the control system 10 for normal cooking processes of the cooker 43, but also for Can control cleaning processes.

However, it should be understood that the thermostat device according to the invention can also be used, if desired, in connection with a stove, with softer no cleaning process is possible, in which case only the switching piece pair of the thermostat device 10 having the two switching pieces 59 and 58 is required. Notwithstanding this, the contact pieces 59, 58 and 78, 77 can also be used without the oven door locking means 96, 95 and the means for the burn-off cleaning process to be carried out at high temperature, if this is desired.

Of course, the person skilled in the art will find further jex ^ parts on the basis of the patent claims and the drawings Possible modifications and applications within the scope of the invention of the subject matter of the invention.

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Claims (21)

2U9893 Claims 1, l thermostat device, characterized by a housing (11), further by a coiled tube (22) with two preferably oppositely facing ends (23 » 24), of which one end (23) is attached to the housing (11) and the other end (24) is movable relative to said one end, further through a (26) connected to the pipe (22), filled with fluid temperature sensor (25)> with expansions and contractions of the temperature sensor (25) caused by the action of heat Causing fluid corresponding movements of said other pipe end (24) with respect to the housing (11), furthermore by two switching pieces (58, 59) of a pair of switching pieces carried by the housing (11), which are normally placed against one another and in electrical contact with one another ( 62, 63), furthermore by control means (42, 44, 47, 48) carried by the housing (11) for the optional adjustment of one (58) of the two contact pieces (58, 59) relative to the housing (11) in a certain position, and finally by means (33, 35) fastened to the said other pipe end (24), which are attached to the respective other (59) of the said two switching pieces - 33 - 209816/1396 ZH 2U9893 can create such that this other contact piece in the direction of said one contact piece away is moved when the temperature sensor (25) senses a certain temperature, the setting of the control means that perceivable temperature is determined at which the pipe (22) in each case said two Contact pieces moved away from each other. 2. Thermostatic device according to claim I ₃ dadurca characterized in that the tube (22) is wound into a spiral and said other tube end (24) forms the inner end of the spiral. 3. Thermostatic device according to claim 2, characterized in that said other end (24) of the tube (22) has two opposite sides (27, 28) and that said means (33j 35) attached to this other tube end (24) have a U-shaped element (33), the legs (31 »32) of which are fastened to the sides (27, 28) of this other pipe end (24) facing away from one another. 4. Thermostat device according to claim 3, characterized in that that the web of the U-shaped element (33) one - 34 209816/1396 each against the named other contact piece (59)
pushing rod (35) carries. 5. Tnermostatgerät according to claim 4, characterized gekennzeicnnet that said rod (35) made of electrical
insulating material. 6. Tnermostat device according to one of claims 1
Dis 5a characterized in that said one
Switching piece (58) is fastened at one end to the housing (11) and its other end (60) facing away therefrom is movable relative to the housing and carries a contact (62) for an electrical contact connection with said other switching piece (59). 7. Tnermostat device according to claim 6, characterized in that that a compression spring (77) is inserted between the housing (11) and said one switching piece (58), which said other end (60) of this one contact piece in the direction of said other contact piece (59) tried to move. 8. Thermostatic device according to claim 7 , characterized in that said control means (42, 44, 47, 48) - 35 209816/1396 2U9893 an axially movable element (48) carried by the housing (11) and which on that side of said one contact piece (58) can be brought into contact, which from that side of this one Switching piece (58) is turned away, on which the said compression spring (77) rests in order to thereby the called a switching piece (58) relative to the housing (11) to be able to adjust each to a certain position. 9. Thermostat device according to claim 8, characterized in that said control means (42, 44, 47, 48) a rotatable element (41, 42) screwed into the housing (11) and that said element axially movable element (48) is arranged between the rotatable element (41, 42) and said one contact piece (58). 10. Thermostatic device according to claim 9, characterized in that said axially movable element (48) has a pin or consists of a pin which is formed from electrically insulating material. 11. Thermostatic device according to one of claims 1 to 10, characterized by a further pair of, from the housing (11) worn contact pieces (77, 78), which normally - 36 209818/1396 abut one another and are thereby in electrical contact with one another, the named »of the named other end (24) of the tube (22) carried means (33, 35) one (e.g. 78) of the two other contact pieces (77 * 78) mentioned and this contact piece (78) can move away from the associated other contact piece (e.g. 77) »if the temperature sensor (25) has a perceives a certain temperature. 12. Thermostat device according to claim 11, characterized in that that the housing (11) has an element (85) for adjusting the one switching piece (77) of the said further Switching piece pair (77, 78) relative to the housing (11), with which the setting of that temperature can be changed, which must be perceived by the temperature sensor (25) before this further Contact pair opens its contacts or moved away from each other. 13. Thermostat device according to claim 12, characterized in that the two switching pieces (77, 78) of the said further contact pair are each fastened with their one ends on the housing (11) and with in the other ends are movable relative to the housing in such a way that - 37 209816 / 13S8 that these other ends cooperate with one another in the sense of switch contacts. 14. Thermostat device according to claim 13, characterized in that that the housing (11) has slots in which said one ends of the contact pieces (77, 78) of said further contact pair are added and attached to the housing. 15 thermostat device according to one of claims 1 to 14, characterized by a plurality of further pairs of contact pieces (87, 88; 95, 96), each of which on the one hand are carried by the housing (11) and on the other hand relatively movable electrical holder contacts and that said means (33, 35) carried by said other end (24) of the tube (22) are arranged in such a way that they are each attached to a contact piece (e.g. 88; 96) of the other pairs of contact pieces mentioned and this from the other associated contact piece (e.g. 87, 95) of the respective contact piece pair move away when the temperature sensor (25) senses a certain temperature. 16. Application of a thermostat device after a - 38 - - 209816/1396 2U9893 of claims 1 to 15 on control and regulation systems of Cookers, characterized by control means carried by the housing (11) of the thermostat device (10) for control of the heating effect of heating means of the concerned Cooker, further through the coiled tube (22), also carried by the housing, of which one end (24) as a function of expansions and contractions caused by temperature changes of the heating means can be moved relative to the housing by the fluid located in the tube, the movable end (24) of the pipe (22) is in operative connection with said control means and thereby these control means in Depending on the heat given off by the heating means. 17 · Thermostat device according to claim 16, characterized in that that said control means control said heating means in each case for a cooking process. 18. Thermostat device according to claim 16 or 17, characterized in that said control means are designed so that they control the said heating means in the sense of a non-cooking and warming process. - 39 209816/1396 19. Thermostat device according to one of claims to 18, characterized in that said Control means said heating means for a burn-off cleaning process control at high temperature. 20. Thermostat device according to claim 19, characterized in that that said control means also include door locking means of the cooker during said Control or actuate the burn-off cleaning process. 21. Application of a thermostat device according to one of claims 1 to 20 for controlling the heating means of a cooker, characterized in that the temperature sensor (25) is arranged in such a way that it detects the from or in the cooker measures generated heat, and that the contact pieces (58, 59) of the former. Switching piece pairs are in operative connection with said heating means in such a way that the latter are then excited when these contact pieces are in contact with each other, with through the opening and closing of the two contact pieces determines the oven temperature. - 40 209816/1396