Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C7/00—Stoves or ranges heated by electric energy
  • F24C7/08—Arrangement or mounting of control or safety devices
  • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
  • F24C7/083—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on tops, hot plates
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
  • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
  • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator

Definitions

• the invention relates to an operating device for a household appliance, preferably a hob according to the preamble of claim 1.
• Glass ceramic hobs with control devices of this type are commercially available. These have a glass ceramic plate with e.g. four hotplates and an operating field. Actuators in the form of touch switches are arranged in the operating field, with sensors on the underside of the plate, which respond to touches by the operator on the top of the plate. Various operating states of the cooktop can be set with these adjusting devices. They serve z. B. each for preselecting the hotplate to be set or for setting the heated area of the hotplate or for switching on and off a pot detection to determine whether a pot is placed on the hotplate or to switch a main switch of the device on or off or to lock the main switch in the off position.
• an operating element in the form of a rotary knob held detachably by magnetic forces, is placed on the plate in the operating field.
• actuating pulses for switching up and switching down the heating power of a preselected hotplate are given by means of sensors arranged under the plate of a control device.
• a removal of the rotary knob is carried out by a e.g. under the plate, referred to here as a control element sensor.
• magnetically operated switching device detected and switches off the main switch and thus resets all settings made via the control device. This is an essential safety feature of this operating device. This ensures quickly and clearly that nothing can be switched on and that there is no danger from the hob.
• the button can be lost if it is misplaced or a child kidnaps it and the dog buries it in the garden.
• the cooktop cannot be used without the rotary knob.
• a control arrangement for an electric heating device and in particular a hob is known from German Offenlegungsschrift DE 44 19 866 A1.
• a glass ceramic cooktop has several hotplates and an operating device in the form of a control panel with several touch switches.
• a control unit for evaluating the signals of the touch switches and a main switch are also provided.
• a removable control element is not provided.
• the invention has for its object to provide an operating device according to the preamble of claim 1, which avoids the disadvantages of the known operating devices and in particular increases the ease of use.
• This object is achieved by the combination of features of claim 1.
• This solution has the advantage that the device can be used even if the control element is not present, which significantly increases the usability. This is especially important for a domestic stove.
• the solution is not limited to such an emergency.
• the operating device can also be designed in such a way that the alternative operation can also be selected, depending on personal preference, even if the operating element is present. This also increases the ease of use.
• a single first actuating device with a removable control element is also available for setting a plurality of similar work areas, for example the respective output of a plurality of hotplates of a device, which results in clear operation, especially when the control device does not have any other has another removable control.
• all other control elements are expedient, but at least the second control device or the second control devices and the reversing actuating device or the reversing actuating devices are designed without operationally removable, lost parts, for example as a touch switch, in order to be permanently operable insofar as they are in operation or supplied with energy.
• the sensors can be arranged invisibly under the glass ceramic plate and can be switched by touching the plate at marked points on its upper side.
• the second actuating device serves as a reversing actuating device in a multiple function, in that the blocking device is first released or overcome by its actuation and its function is reversed with the reversing into the alternative mode.
• the second actuating device can have another actuating function e.g. to select one of several working areas of the device, e.g. a hotplate, the operating state of which can then be set in normal operation by means of the first actuating device and in alternative operation by means of the second actuating device.
• a third actuating device can be used as the reversing actuating device, the third actuating device preferably having a further actuating function, e.g. for locking and unlocking a device main switch in the switched-off position.
• the control element sensor can switch the third actuating device into the function as a reversing actuating device.
• the blocking device can comprise a timer which, after the reversing actuating device has been actuated for a predetermined time, e.g. The blocking device is released for 5 seconds.
• a control element sensor can prevent the changeover to alternative operation, which increases safety.
• an alternative operation can also be permitted if the control element is present, which increases the ease of use.
• the control element sensor can respond to the removal of the control element of the first actuating device and can turn off a main switch of the device and thus reset the settings, for example the power settings of hotplates.
• the main switch can be switched on bypassing an on / off switch.
• the on-off switch can keep its normal function even when there is no control element, which increases safety against unintended operation.
• a signal transmitter is expediently present, via which the control device transmits a signal, e.g. emits a sound signal or a light signal as soon as the blocking device has been released.
• a signal e.g. emits a sound signal or a light signal as soon as the blocking device has been released.
• This can be an illuminated display, which also serves to indicate an operating state and, after the blocking device has been released, flashes as a signal transmitter and is preferably arranged spatially adjacent to the actuation area of the second actuating element, thereby also indicating the next operating step.
• the first actuating device can be used to set an expediently safety-relevant operating state of at least one working area of the device, preferably the power of at least one hotplate.
• Fig. 1 is a plan view of a ceramic hob
• FIG. 2 shows a view of the hob according to FIG. 1 from below in FIG.
• Fig. 3 in a view corresponding to that of Fig. 2 shows a modified embodiment.
• the hob 12 shown in FIGS. 1 and 2 has a glass ceramic plate 14 which is surrounded by an installation edge (not shown) for installation in a kitchen worktop.
• Two hotplates 16 and 18 are marked on the plate 14 and can be heated by heating devices 20 and 22 arranged under the plate.
• the heating devices 20 and 22 are each supplied with power via their own circuit breaker 24 or 26, which is set by an evaluation logic 28, for example in the form of a programmable microcontroller.
• the power supply to the circuit breakers 24 and 26 and the evaluation logic 28 takes place via a main switch 29 and is not shown for simplification.
• the main switch 29 has two connections 30 for a voltage supply and reports its operating state to the evaluation logic 28 via a control line 31.
• the evaluation logic 28 reports its operating state to the main switch 29 via a feedback line 32.
• the main switch 29 and the evaluation logic 28 together form a control device.
• buttons 33 and 34 are marked on the plate 12 and, on the underside of the plate 14, there are touch sensors serving as second actuating devices as selection sensors 35 and 36, which respond to touches on the top and on Output signal to the control device 28.
• a light indicator 38 or 40 is arranged next to each and indicates the set heating output of the hotplates 16 and 18 through the plate 14.
• an actuating device 42 serving as the first actuating device is arranged on the plate 14.
• an operating element sensor 48 which can have, for example, a reed switch that responds to a magnet arranged in the rotary knob 46 and reports to the control device or the main switch 29 whether the rotary knob 46 is present or not.
• a locking touchpad 50 is marked, on the underside of which a locking sensor 52 is arranged, which responds to touch of the touchpad 50 by an operator's finger and sends a signal to the main operator via a timer 54. Switches 29 to lock it in its off position.
• the timer 54 only emits its signal after the locking sensor 52 has been operated for 5 seconds.
• the main switch can be actuated via an on-off sensor 56, which is arranged in a manner not shown below a marked on-off touch panel 58 of the plate 14.
• the signals from the control element sensor 48 and the locking sensor 52 are also fed to an AND gate or AND switch 60, the output signal of which is fed to the evaluation logic 28 and the main switch 29.
• the hob 12 works as follows: after releasing the lock by actuating the locking keypad 52 for 5 seconds and turning on the main switch 29 via the on / off touch panel 58, touching one of the selection touch panels 33 or 34 with the Finger selected which of the hotplates 16 and 18 should be set.
• the associated light indicator 38 and 40 lights up and then shows the power that is set by means of the rotary knob 46. The same process can then be repeated for the other hotplate. If the control element in the form of the rotary knob 46 is removed during operation, the control element sensor 48 reports this to the main switch 29, which then switches off the heating devices 20 and 22 via the circuit breakers 24 and 26 and also causes the power settings to be reset.
• the evaluation logic 28 is set up or programmed as follows.
• the control element sensor 48 reports the absence of the rotary knob 46 to the main switch 29 by means of a signal
• the evaluation of the signal of the locking sensor 52 or of the time switch 54 connected thereafter is carried out
• Control element sensor 48 if the control element or the rotary knob is missing, and the locking sensor 52 are both fed to the AND switch 60, which, if both are present, emits a signal. This switches on the main switch 29 and switches the evaluation logic 28 into alternative operation.
• the signal processing of the signals of the selection sensors 35 and 36 serving as second setting devices is switched over in such a way that in addition to the preselection of the assigned hotplate 16 or 18, the heating power thereof can be set, by touching the finger with the selection key fields 30 or 32 the Performance is keyed up or is continuously ramped up with permanent contact. If the maximum setting is exceeded, the count starts again at 0. Before the heating output is set, both light indicators 38 and 40 show the zero position and first flash to indicate the changed operation and the next operating step. If you touch the selection buttons 33 or 34 for longer than 5 seconds, the Cooking area redesigned.
• the output signal of the AND switch 60 can also be fed to the evaluation logic 29 in order to switch it over.
• the hob is then switched on via the on-off sensor 56 even when there is no rotary knob 46.
• the embodiment shown in FIG. 3 largely corresponds to the embodiment according to FIGS. 1 and 2 and therefore the same reference numbers are used for the same components as there.
• the normal operation is the same as described there.
• the AND switch 60 according to FIG. 2 is omitted here.
• the signals from the selection sensors 34 and 36 serving as second actuating devices are each fed directly to the evaluation logic 328 for preselecting a hotplate and additionally to a blocking device in the form of a timer 354 or 355. Its output signal, which occurs when the touch buttons 33 or 34 have been touched for longer than 3 seconds, is fed to the evaluation logic 328 on the one hand and there causes the changeover to an alternative operation.
• the output signal of the timers 354 and 355, on the other hand is also fed to the main switch 329 and turns it on.
• the evaluation logic 328 is set up or programmed as follows.
• the sensor 52 of the locking touch pad 50 and the control element sensor 48 do not interact with a changeover switch here, but only have their functions described above for the normal operation of the embodiment according to FIGS.
• the selection sensors 35 and 36 of the selection touch fields 30 and 32 perform further functions for this. If they are pressed for longer than 3 seconds and thus a blocking device formed by the time switch 354 or 355 has been overcome in the control device and thereby one of the hotplates 16 or 18 has been selected at the same time, then the selection sensor 35 or 36 for setting the heating output is the corresponding hotplate 16 or 18 as described in the previous embodiment to use.
• This function of the selection key fields 30 and 32 with the associated selection sensors 35 and 36, which serve as a second actuating device, is independent of the presence or absence of the rotary knob 46 of the first actuating device 42 and thus enables not only emergency operation without a rotary knob 46, but also also an alternative operation with the rotary knob 46 present.
• the time switches 54 or 354 and 355 described in the exemplary embodiments and the AND switch 60 can be integrated in the evaluation logic.
• the main switch 29 or 329 can be operated effectively at least for switching off, even in alternative operation, via the on-off sensor.
• the locking sensor 52 is also operable in alternative operation, without a rotary knob 46.
• the signal of the locking sensor 52 can be fed to a further time switch, the output signal of which is fed to a further input of the main switch 29 in order to lock or unlock it.
• This timer has a shorter time constant, e.g. 3 seconds than the timer 54 with 5 seconds to allow a differentiation in the operation.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Electric Stoves And Ranges (AREA)
• Cookers (AREA)
• Vending Machines For Individual Products (AREA)
• Vehicle Body Suspensions (AREA)
• Push-Button Switches (AREA)

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Applications Claiming Priority (3)

Publications (2)

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• 2002
  • 2002-01-23 DE DE10202493A patent/DE10202493A1/de not_active Withdrawn
• 2003
  • 2003-01-20 DE DE50307076T patent/DE50307076D1/de not_active Expired - Lifetime
  • 2003-01-20 WO PCT/EP2003/000508 patent/WO2003063550A1/fr active IP Right Grant
  • 2003-01-20 AT AT03704433T patent/ATE360349T1/de not_active IP Right Cessation
  • 2003-01-20 ES ES03704433T patent/ES2283748T3/es not_active Expired - Lifetime
  • 2003-01-20 EP EP03704433A patent/EP1470739B1/fr not_active Expired - Lifetime
• 2004
  • 2004-07-23 US US10/897,641 patent/US6998585B2/en active Active

Non-Patent Citations (1)

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