Patent Application
20100156645
The present invention relates to an apparatus for displaying operating states of a cooking vessel in accordance with the features of the preamble of claim 1.
Apparatuses for displaying operating states of a cooking vessel have been known for a long time.
For example EP 0 364 684 shows such an apparatus. This apparatus can be used to monitor the temperature and pressure of a cooking vessel. In this case, the lid of the cooking vessel is provided with an appropriate measuring device. The user can then read off the operating state on a display device. The measurement is performed via a pointer which can be detected by means of a light barrier. In this case, the light barrier can be set to the position of the display which is to be monitored, and then recognizes the pointer when the latter is located in the appropriate position. Thus, it is possible to monitor and/or display only a single operating state, that is to say a specific temperature, for example. Furthermore, the apparatus is incapable of recognizing the variation in the operating state over a specific period; it is thus impossible, for example, to recognize errors in the control of the cooker.
Starting from this prior art it is the object of the invention to specify an operating state display apparatus which is capable of continuously displaying a prevailing operating state.
Furthermore, the present operating state display apparatus is to recognize error states in the control of the cooker.
This object is achieved by an apparatus having the features of Patent claim 1. Advantageous embodiments of the invention are specified in the dependent claims.
Consequently, an apparatus for determining and displaying or monitoring at least one operating state, selected from the group of temperature, pressure or air humidity of a cooking vessel, comprises an adjusting element for detecting the operating state, and a signaling apparatus which comprises an acoustic signal transmitter and/or an optical signal transmitter and/or a display device. An actual value of the operating state can be displayed with the aid of the display apparatus, and an appropriate signal can be output when a setpoint of the operating state is reached. The adjusting element comprises a pivotable measuring disc with a coded structure, and a sensor device is provided for sensing the pivoting path of the measuring disc.
The inventive apparatus is particularly advantageous, because many different operating states can be monitored and displayed on the basis of the coded structure. This means that the operating state measured at a specific or desired instant can be determined and displayed or monitored by the apparatus.
In a preferred embodiment the apparatus can be combined with a lid of a cooking vessel, the adjusting element projecting into the lid space through an opening in the lid.
Further advantageous embodiments are characterized in the dependent claims.
The invention is described in more detail below with the aid of the drawings, in which:
The measuring device 3 comprises a measuring disc 31 and a setting disc 32, both of which are preferably of circular configuration and are arranged concentrically with one another. Here, the setting disc 32 is arranged in a stationary fashion, and the measuring device 31 in a rotatable fashion. The measuring disc 31 can therefore be moved relative to the setting disc 32.
In the present exemplary embodiment, the setting disc 32 is permanently connected to the lid handle 2, and the measuring disc 31 is arranged on a pivotable spindle 33. The measuring disc 31 is arranged in this case below the setting disc 32. A concentric arrangement at the same level or above the setting disc 32 would likewise be conceivable.
The spindle 33 can be pivoted or rotated through a pivoting angle by various adjusting elements according to the measured operating state. Adjusting elements project in this case into the lid space 37 through an opening 38. The operating state serves in this case as an input variable for the pivoting angle of the spindle 33. The spindle 33 is typically pivoted in a pivoting range with an angle from 0° to 180°. Other pivoting ranges, for example smaller ones, are likewise conceivable. The pivoting angle is consequently the representative of the measured operating state.
For temperature measurement, it is preferred to provide a spiral or a coil spring made from bimetal as adjusting element 36 in the lid space 37. Such a spiral or coil spring is particularly well suited for providing an appropriate pivoting angle in accordance with the measured operating state. Such adjusting elements are known from conventional thermometers, and therefore need not be further described here. The fact that an adjusting element is admitted as a planar adjusting element 36 into a corresponding opening 38 in the lid 2, results in the direct and better recording of measured values in the lid space 37.
The opening 38 in the lid 2 is preferably of circular shape and has a diameter from 5 mm to 50 mm. Diameters from 10 mm to 30 mm are particularly preferred, and in this case the lower boundary can also lie between 10 mm and 20 mm.
Instead of an adjusting element 36 for the temperature measurement, the reference numeral can also stand for a cylindrical adjusting element for recording pressure or humidity. The pressure can be measured, for example, by means of a tube spring or a diaphragm. The humidity is preferably detected by means of a mechanical hygrometer.
In accordance with
If the two discs 31, 32 are arranged one above another and identical measuring methods are used for both discs 31, 32, the circular track of the coded structure 134 of the setting disc 32 has a radius differing from that of the coded structure 34 of the measuring disc 31. The coded structures 34, 134 can lie one above another when different measuring methods are applied which do not influence one another, as will be explained later.
In what follows, a display disc 5 is arranged above the setting disc 32. The display disc 5 comprises a scale 51 which displays the temperature to be set or desired setpoint. In this case, the scale 51 is printed on or embossed in such a way that it can be effectively read off by the user.
The sensor device 4, here the measuring sensor 4′ and the setting sensor 4″, is able to scan the coded structure 34, 134, and to determine corresponding movements between the sensor device 4 and setting disc 32 or measuring disc 31, and to output a corresponding signal. The signal is preferably an electrical signal; depending on the configuration of the coded structure 34, 134, this is an analogue or a digital signal. The signal is a representative of the path covered by the measuring disc 31 or the path covered via the setting disc 32. Since the path covered by the measuring disc 31 is, in turn, a representative of the operating state, the signal therefore represents the operating state. The path covered by the setting device 6 via the setting disc 32 represents the desired setpoint set, and so the signal therefore represents the setpoint value here.
The sensor device 4 comprises at least a light source 41 and a light sensor 42. The light source 41 in this case transmits a light signal to the coded structure 34 on the measuring disc 31 or to the coded structure 134 on the setting disc 32, and the light sensor 42 detects the light reflected by the coded structure 34, 134.
Two sensor devices 4 arranged one behind another are typically provided for a coded structure 34, 134 in digital form. Here the two sensor devices 4 lying at the same radial distance, have an angular distance from one another which is greater than or less than the distance from one digital point to a next digital point of the coded structure. This permits the pivoting direction of the measuring disc 31 and/or the setting disc 32 to be recognized.
In the present exemplary embodiment, the sensor device is integrated in the input device 6. The input device 6 is to be clipped onto the bead of the lid handle by the latching element 63, and can be rotated relative to the lid handle 2. It follows that the input device 6 can be connected to the lid handle 2 in a coupling fashion. This permits a flexible use of a number of lids 1 provided with a setting disc 31, measuring disc 32 and adjusting element 36. The sensor device 4 is therefore arranged in such a way that during the setting operation described below said sensor device can be moved relative both to the setting disc 32 and to the measuring disc 31. By contrast, during the measuring operation only the measuring disc 31 is moved, specifically relative to the setting disc 32 and also to the sensor device 4. Because of its configuration, the sensor device 4 can detect the path covered by the measuring disc 31, which represents an operating state, and output an appropriate signal.
The sensor device 4 therefore has to detect two movements. These are the first movement of the input device 6 relative to the setting disc 32, and the second movement of the measuring disc 31 relative to the input device 6. The sensor device 4 therefore comprises a first sensor for detecting the first movement, also denoted as setting sensor, and a second sensor for detecting the second movement, also denoted as measuring sensor.
The input device 6 is therefore arranged such that it can be pivoted or rotated over the setting disc 32 and the measuring disc 31. In the exemplary embodiment illustrated, the pivoting of the input device 6 serves for determining the initial operating state and for setting the setpoint of the desired operating state, that is to say a specific cooking temperature for example. This purpose is served by an indicator 60 which is pivoted along a scale 51 as far as the desired setpoint printed on the display disc 5. The interaction of the input device 6 with the setting disc 32 and the measuring disc 31 is described in more detail with the aid of
In addition the input device comprises two optional keys 61 and an optional display panel 62. The display panel 62 can serve for displaying operating states, or displaying predefined parameters such as cooking temperatures for specific foodstuffs. Furthermore the input device 6 comprises a signal transmitter, a storage means and a control means. The control means is connected in this case to the storage means and/or the sensor device. An application-specific integrated circuit (ASIC), for example, can be used as control means. The signal transmitter can output an operating state signal such as an acoustic signal or an optical signal, for example, which can be recognized by the user. If an acoustic signal is to be output, the signal transmitter is a buzzer. An optical signal can be output either via the display or via a separate light emitting diode or another display means. The storage means serve for storing the predefined parameters and for storing the required control code for the input device 6.
The operating state display apparatus can be integrated in a lid handle 2, as shown in
Such an autonomous operating state display apparatus can be used with many different cooking vessels. If no mechanical means 63 are set, the apparatus can, for example, have for this purpose magnets with the aid of which the apparatus 6 can be connected to the cooking vessel. If the cooking vessel is made from a non-magnetic material, the operating state display apparatus can also be laid onto the cooking vessel in a lid trough.
In a further embodiment (not shown), the operating state display apparatus can also be integrated in the lid 2.
In
In other words it is also possible to say that the coded structure 34, 134 is split up into individual increments, and that these increments, or the spacing between the increments, corresponds to a defined change in an operating state.
Furthermore, it would also be possible for the coded structure to be a coloured circular segment extending over the entire pivoting range, the intensity of the colouring of the circular segment varying over the entire circular segment so as to produce a different reflection of the light beam at each position. An analogue measurement is also spoken of in this case.
Further patterns having an analogue or digital structure are also conceivable. For the purpose of explanation, the points 35 are displayed in different colours. In
Further possibilities for measuring a path with the aid of a sensor are likewise possible. For example, the measuring disc could be arranged in angular fashion such that the distance between the sensor and measuring disc changes in the event of pivoting. A capacitive or inductive proximity sensor is preferably used here.
In a first step, the user sets the setpoint of the operating state which is to be reached, in
As soon as the input device 6 pivoted by the user has reached the desired position, that is to say the desired setpoint, the input device is not further pivoted. This position is illustrated in
In an alternative embodiment, however, the setpoint can also be input via the two keys 61 of the input device 6. In the case of such an input, there is no pressing need to pivot the input device over the setting disc 32.
A change in the operating state results via the adjusting element in a pivoting of the measuring disc 31. This means, for example, that the cooking vessel located on a cooker is being heated by the hotplate. This causes the adjusting element 36 made from bimetal to begin deforming. This deformation results in a pivoting of the measuring disc 31. This pivoting can be detected by the measuring sensor 4″. Depending on the configuration of the display means, the current operating state is displayed by the openings 52-55 in the display disc and by the display line 55 arranged on the measuring disc, or the operating state is displayed via the display panel. In a further embodiment, it is likewise possible to conceive a combination of displaying by means of the display disc and the display panel. As soon as the previously set operating state is reached, the operating state display apparatus advantageously outputs the acoustic or optical signal.
If, for example, the temperature is said operating state, the user can adjust the power of the cooker after the operating state is reached such that the desired operating state is maintained.
The control device can, moreover, be programmed in such a way that when the setpoint of the operating state is reached a first operating state signal is output. If the value of the operating state, for example in the case of a temperature rise, continues to rise, a further signal can be output when a limiting value defined in the control is exceeded. The limiting value is defined here as the setpoint plus and/or minus a specific amount. For example 80° C. plus/minus 10° C. Here, a signal would therefore be output when 70° C. was reached and/or at 90° C. The limiting values can also be denoted as lower limiting values, here 70° C., or as upper limiting value, here 90° C. However, this amount can also be such that when the setpoint is exceeded a relatively large or a relatively small amount is permitted, and upon the value falls below the setpoint a relatively small or relatively large amount is permitted. For example, 80° C. plus 15° C./minus 10° C. or 80° C. plus 10° C./minus 15° C. In this case, an appropriate signal can be output both in the case of a temperature rise (for example, from 65° C. to 75° C.), and in the case of a temperature drop (for example from 75° C. to 65° C.) The signals for the temperature rise and for the temperature drop are preferably different and can thus be recognized by the user.
Moreover, it is also possible to provide a programming which prescribes a specific temperature for specified food (for example 80° C.) and defines the corresponding limiting values in accordance with the above description.
In a further exemplary embodiment, the control has an interface via which it is possible to communicate with the cooker control, which likewise has one such interface. Here, the cooker control can be operated as a function of the current operating state. In this case, the control means comprises a transmitter with which a control signal can be generated. This control signal is transmitted in wireless fashion to a receiver of a heating apparatus acting on the cooking vessel, for example the cooker control. Wireless transmission methods include known cable-free methods, for example via infrared, Bluetooth or other radio links.
In a further exemplary embodiment, the control is, additionally, configured in such a way that these errors can be recognized in the cooker control. An error is defined as an implausible alteration in the operating state over a specific time period. It is, for example, implausible not to reach the first operating state in a predetermined time. If the operating state is a temperature, the predetermined time is a function, for example, of the food, of the type of cooking range and the type and/or size of the vessel. Such an error could, for example, be a failure of the heating elements. Further states to be detected could, given correct setting, be the wrong power of the hotplate or the wrong cooker setting. When cooking is done with little water, the absence of water results in a slowed down temperature rise.
| Number | Date | Country | Kind |
|---|---|---|---|
| 07110530.8 | Jun 2007 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/CH2008/000272 | 6/17/2008 | WO | 00 | 2/9/2010 |
