ILLUMINATED ROTARY KNOB FOR HOUSEHOLD APPLIANCE

Abstract

The present invention relates to an illuminated releasable rotary knob for use in an appliance, in particular in a cooking appliance comprising a panel which includes a regulator shaft; and a control unit which has an electrical connection for supplying electric power. The knob comprises non-transparent handle, a hub for releasably receiving the shaft, a cavity, an illuminating device for illuminating the cavity, a connector for receiving the electrical connection and a transparent indicator which receives the illumination from the cavity.

Claims

1. A rotary knob for use in a household appliance comprising a panel which includes one or more regulator shafts; a control unit which has one or more electrical connections for supplying electric power, the rotary knob comprising a non-transparent handle which has a hub adapted to releasably receive the respective regulator shaft; a cavity, an illuminating device adapted to illuminate the cavity, wherein the illuminating device includes a connector for receiving the respective electrical connection; and an indicator which is made from a transparent material, wherein the indicator is eccentrically disposed onto the handle so as to face the user and adapted to receive the illumination from the cavity, the rotary knob being characterized in that a collar which is made from a transparent material, wherein the collar is circumferentially disposed onto the handle so as face the user and adapted to receive the illumination from the cavity, wherein the handle, the hub, the illuminating device including the connector, the indicator, and the collar are adapted for releasable installation onto the panel entirely from the outside.

2. The rotary knob according to claim 1, characterized in that the illuminating device comprises a detection unit adapted to detect the rotation of the hub, wherein the illuminating device is adapted to selectively illuminate based on the detection result of the detection unit the cavity with one of a plurality of different colored lights which include at least a first colored light and a second colored light which is different from the first colored light.

3. The rotary knob according to claim 2, wherein each electrical connection is further adapted to transmit/receive signals, the rotary knob being characterized in that the illuminating device is further adapted to transmit the detection result via the connector and the respective electrical connection to the control unit.

4. The rotary knob according to claim 3, characterized in that the illuminating device includes two or more light sources of the first color and two or more light sources of the second color which are alternately disposed around the rotational axis.

5. The rotary knob according to claim 1, characterized in that the collar is covered by a non-transparent layer except for one or more areas on its circumference, wherein each area is located at a respective angular position and defines a respective marking that is indicative of a corresponding adjustment of the respective regulator shaft.

6. The rotary knob according to claim 5, characterized in that one or more markings are each provided in form of a number that indicates a corresponding temperature value.

7. The rotary knob according to claim 1, characterized in that a separate holder adapted to releasably hold the illuminating device; and a separate ring-shaped electrically insulating protective cover which is made from a transparent material, wherein the cover is adapted for releasable engagement with the holder with the illuminating device being held therebetween and to substantially uniformly spread the illumination into the cavity.

8. The rotary knob according to claim 7, characterized in that a separate base adapted for releasable installation directly onto the panel entirely from the outside, wherein the holder is further adapted for releasable accommodation within a depression of the base and wherein the cover is also adapted for accommodation within the depression of the base at a position above the illuminating device.

9. The rotary knob according to claim 7, characterized in that the ring-shaped electrically insulating protective cover comprises a plurality of regularly alternating notches and ribs for uniformly spreading the illumination into the cavity.

10. A household appliance, in particular a cooking appliance comprising a panel which includes one or more regulator shafts and a control unit which has one or more electrical connections each adapted to supply electric power, characterized in that one or more illuminated releasable rotary knobs each as defined in claim 1, wherein the control unit is further adapted to control the illuminating device of each rotary knob and wherein the panel, each regulator shaft and each electrical connection is adapted for releasable installation of the respective rotary knob entirely from the outside.

11. The household appliance according to claim 10, where dependent on claim 3, characterized in that each electrical connection is further adapted to transmit/receive signals, and the control unit is further adapted to receive via each electrical connection the detection result that is output by the respective illuminating device, and to concurrently start illuminating each rotary knob that has been turned ON with a first colored light and each rotary knob that has been turned OFF with a second colored light which is different from the first colored light when any rotary knob is rotated.

12. The household appliance according to claim 11, characterized in that the control unit is further adapted to terminate illuminating all rotary knobs when a predetermined time has elapsed from the respective start, wherein the control unit is further adapted to restart illuminating each rotary knob that has been turned ON with a first colored light and each rotary knob that has been turned OFF with a second colored light when any rotary knob is rotated again.

13. The household appliance according to claim 10, characterized in that the household appliance is provided as a free standing or built-in type cooking appliance which comprises a cooking chamber and/or a cooking top, wherein the cooking chamber and the cooking top each has one or more heating units, and wherein each heating unit is provided as a gas burner or an electric heater, wherein each heating unit is linked to a respective regulator shaft.

14. A method for controlling one or more rotary knobs each as defined in claim 1, the method comprising: a step of monitoring whether any rotary knob is rotated and a step of concurrently starting illuminating each rotary knob that has been turned ON with a first colored light and each rotary knob that has been turned OFF with a second colored light which is different from the first colored light when the monitoring result is affirmative.

15. The method according to claim 14, further comprising: a step of terminating illumination of all rotary knobs in the illuminating step when a predetermined time has elapsed from the respective start, wherein the illuminating step is started over when the monitoring result is again affirmative

Description

[0021] Additional features and additional advantageous effects of the rotary knob and the household appliance of the present invention will become more apparent with the detailed description of the embodiments with reference to the accompanying drawings in which:

[0022] FIG. 1is a schematic partial front view of a household appliance which has an illuminated releasable rotary knob according to an embodiment of the present invention;

[0023] FIG. 2is a schematic exploded view of the illuminated releasable rotary knob according to an embodiment of the present invention;

[0024] FIG. 3is a schematic sectional view of the household appliance of FIG. 1, taken along the line A-A;

[0025] FIG. 4is a flowchart showing the steps of a method for controlling the illuminated releasable rotary knob or the household appliance according to an embodiment of the present invention.

[0026] The reference signs appearing on the drawings relate to the following technical features. [0027] 1. Rotary knob [0028] 2. Household appliance [0029] 3. Panel [0030] 4. Handle [0031] 5. Hub [0032] 6. Cavity [0033] 7. Illuminating device [0034] 8. Connector [0035] 9. Indicator [0036] 10. Collar [0037] 11. Detection unit [0038] 12. Light source [0039] 13. Light source [0040] 14. Holder [0041] 15. Cover [0042] 16. Base [0043] 17. Depression [0044] 18. Notch [0045] 19. Rib [0046] 20. Screw [0047] 21. Screw [0048] 22. Hole [0049] 23. Hook [0050] 24. Rim [0051] 25. Pin [0052] 26. Opening [0053] 27. Aperture [0054] 28. Gap [0055] 29. Slot [0056] 30. Receptacle

[0057] The illuminated releasable rotary knob (1) is suitable for use in a household appliance (2), in particular a cooking appliance.

[0058] The household appliance (2) comprises a panel (3) which includes one or more regulator shafts (not shown) each adapted to releasably receive the respective rotary knob (1); and a control unit (not shown) which has one or more electrical connections (not shown) each adapted to supply the respective rotary knob (1) with electric power.

[0059] The rotary knob (1) comprises a non-transparent rotary handle (4) which has a hub (5) adapted to releasably receive the respective regulator shaft; a cavity (6), an illuminating device (7) adapted to illuminate the cavity (6), wherein the illuminating device (7) includes a connector (8) for receiving the respective electrical connection of the appliance (2) and an indicator (9) which is made from a transparent (light conductive) material, wherein the indicator (9) is eccentrically disposed onto the handle (4) so as to face the user and adapted to receive the illumination from the cavity (6).

[0060] The rotary knob (1) of the present invention comprises a collar (10) which is made from a transparent material, wherein the collar (10) is circumferentially disposed onto the handle (4) so as face the user and adapted to receive the illumination from the cavity (6), wherein the handle (4), the hub (5), the illuminating device (7) including the connector (8), the indicator (9), and the collar (10) are adapted for releasable installation onto the panel (3) entirely from the outside.

[0061] The household appliance (2) of the present invention comprises one or more rotary knobs (1), wherein the control unit is further adapted to control the illuminating device (7) of each rotary knob (1), and wherein the panel (3), each regulator shaft and each electrical connection is adapted for releasable installation of the respective rotary knob (1) entirely from the outside.

[0062] In an embodiment, the illuminating device (7) includes a detection unit (11) adapted to detect the rotation of the hub (5). In this embodiment, the illuminating device (7) is adapted to selectively illuminate based on the detection result of the detection unit (11) the cavity (6) with one of a plurality of different colored lights which include at least a first colored light and a second colored light which is different from the first colored light.

[0063] In another embodiment, the first colored light is red and the second colored light is blue.

[0064] In another embodiment, each electrical connection is further adapted to transmit/receive signals. In this embodiment, the illuminating device (7) is further adapted to transmit the detection result via the connector (8) and the respective electrical connection to the control unit of the appliance (2).

[0065] In another embodiment, the illuminating device (7) includes two or more light sources (12) such as LED (Light Emitting Diode) of the first color and two or more light sources (13) such as LED of the second color which are alternately disposed around the rotational axis.

[0066] In another embodiment, the collar (10) is covered by a non-transparent layer (not shown) except for one or more areas (not shown) on its circumference. In this embodiment, each area is located at a respective angular position and defines a respective marking (not shown) that is indicative of a corresponding adjustment of the respective regulator shaft.

[0067] In another embodiment, one or more markings are each provided in form of a number (not shown) that indicates a corresponding temperature value.

[0068] In another embodiment, the rotary knob (1) comprises: a separate holder (14) adapted to releasably hold the illuminating device (7); and a separate ring-shaped electrically insulating protective cover (15) which is made from a transparent (light conductive) material, wherein the cover (15) is adapted for releasable engagement with the holder (14) with the illuminating device (7) being held therebetween and to substantially uniformly spread the illumination into the cavity (6).

[0069] In another embodiment, the rotary knob (1) further comprises a separate base (16) adapted for releasable installation directly onto the panel (3) entirely from the outside. In this embodiment, the holder (14) is further adapted for releasable accommodation within a depression (17) of the base (16). In this embodiment, the cover (15) is also adapted for accommodation within the depression (17) of the base (16) at a position above the illuminating device (7).

[0070] In another embodiment, the ring-shaped electrically insulating protective cover (15) comprises a plurality of regularly alternating notches (18) and ribs (19) for uniformly spreading the illumination into the cavity (6).

[0071] In another embodiment, the control unit is further adapted to receive via each electrical connection the detection result that is output by the respective illuminating device (7), and to concurrently start illuminating each rotary knob (1) that has been turned ON with a first colored light and each rotary knob (1) that has been turned OFF with a second colored light which is different from the first colored light when any rotary knob (1) is rotated.

[0072] In another embodiment, the control unit is further adapted to terminate illuminating all rotary knobs (1) when a predetermined time has elapsed from the respective start. In this embodiment, the control unit is further adapted to restart illuminating each rotary knob (1) that has been turned ON with a first colored light and each rotary knob (1) that has been turned OFF with a second colored light when any rotary knob (1) is rotated again.

[0073] In other alternative embodiments, the household appliance (2) is provided as a free standing or built-in type cooking appliance which comprises a cooking chamber (not shown) and/or a cooking top (not shown), wherein the cooking chamber and the cooking top each has one or more heating units (not shown), wherein each heating unit is provided as a gas burner (not shown), an electric heater (no shown), or an induction heater (not shown), and wherein each heating unit is linked to a respective regulator shaft that has a respective rotary knob (1).

[0074] In another embodiment, the hub (5) is provided separately from the handle (4) and the collar (10). In this embodiment, the hub (5) is attached to the handle (4) by means of screws (20). In this embodiment, the collar (10) is detachably clamped between the handle (4) and the hub (5).

[0075] In another embodiment, the base (16), the holder (14), the illuminating device (7) have mutually coinciding holes (22) for jointly receiving a respective screw (21) that is to be screwed from the outside into a respective counterpart hole (not shown) on the panel (3).

[0076] In another embodiment, the holder (14) has one or more snapping hooks (23) which releasably engage with the rim (24) of the cover (15).

[0077] In another embodiment, the holder (14) has one or more positioning and alignment pins (25). In this embodiment, the illuminating device (7) has one or more counterpart openings (26) which receive the respective pin (25).

[0078] In another embodiment, the base (16) and the holder (14) have mutually coinciding apertures (27) for receiving the respective electrical connection of the appliance (2) that is detachably attachable to the connector (8). In this embodiment, each electrical connection protrudes sufficiently beyond the panel (3) through a respective counterpart aperture (not shown) thereof so as to be attached to or unattached from the respective connector (8) from the outside.

[0079] In another embodiment, the base (16), the holder (14), the illuminating device (7) and the cover (15) have mutually coinciding gaps (28) for receiving the hub (5) and the respective regulator shaft from the outside.

[0080] In another embodiment, the handle (4) has a slot (29) which form-fittingly receives the illuminated indicator (9).

[0081] In another embodiment, the illuminating device (7) is provided in form of a printed circuit board.

[0082] In another embodiment, the detection unit (11) and the connector (8) are disposed onto the lower side of printed circuit board whereas the light sources (12, 13) are disposed onto the upper side of the printed circuit board.

[0083] In another embodiment, the holder (14) has a receptacle (30) for accommodating the detection unit (11). In this embodiment, the bottom of the receptacle (30) interlocks with the gap (28) of the base (16).

[0084] In another embodiment, the detection unit (11) is secured in place by one or more pins (25) of the holder (14).

[0085] In another embodiment, that base (16) is produced from a suitable metal material. And the handle (4), the hub (5), the indicator (9), the collar (10), the holder (14), and the cover (15) are produced from a suitable plastic material.

[0086] The control method of the present invention comprises a step (S1) of monitoring whether any rotary knob (1) is rotated; and a step (S2, S3) of concurrently starting illuminating each rotary knob (1) that has been turned ON with a first colored light and each rotary knob (1) that has been turned OFF with a second colored light which is different from the first colored light when the monitoring result is affirmative.

[0087] In another embodiment, the control method further comprises: a step (S4) of terminating illumination of all rotary knobs (1) in the illuminating step (S2,S3) when a predetermined time has elapsed from the respective start, wherein the illuminating step (S2,S3) is started over when the monitoring result is again affirmative.

[0088] A major advantageous effect of the present invention is that both the indicator (9) and the collar (10) can be illuminated by the illuminating device (7) of the rotary knob (1) via the cavity (6). Thereby, the user can more easily and reliably ascertain the current operative state of the respective regulator shaft e.g. the heating unit (not shown). For instance, if the user fails to see the illuminated indicator (9) due to an unfavorable view point, a reduced sight, or bad ambient light conditions then the illuminated collar (10) will easily attract the attention of the user. Thereby, the user can be protected from being misled and is prompted to take a closer look at the position of the illuminated indicator (9). Thereby, also the risk of fire and explosion can be eliminated or reduced as much as possible. Another major advantageous effect of the present invention is that the indicator (9) and the collar (10) can be more intensively illuminated as the illuminating device (7) is located in front of the panel (3). Another major advantageous effect of the present invention is that the complete knob (1) including the illuminating device (7) can be removed from the panel (3) or reinstalled onto the panel (3) entirely from the outside for maintenance, particularly for cleaning or replacement. Thereby, the customer satisfaction can be increased. Other advantageous effects of the present invention can be taken from the aforementioned particular embodiments.