Knob assembly and cooking appliance including same

Abstract

The present disclosure relates to a knob assembly and a cooking appliance including same. The knob assembly (100) according to the present invention may include a base part (110) disposed behind an operation panel (30) and provided with a stopper (115) protruding forward through the operation panel (30). The knob assembly (100) may include a knob body (NB) rotated about a driving shaft (71) protruding from the operation panel (30) and linearly moved in the axial direction of the driving shaft (71). The knob assembly (100) may include a lock button (140) which has an operation part (143) exposed to the outside of the knob body (NB), and which is configured to move along a direction different from the axial direction. In this case, the lock button (140) may have a knob lock position in which the lock button (140) interferes with the stopper (115) in the axial direction to limit the axial movement of the knob body (NB), and a knob unlock position in which the lock button (140) moves from the knob lock position to allow the axial movement of the knob body (NB).

Description

Knob assembly and cooking appliance including the same

[0001] The present invention relates to a knob assembly and a cooking appliance including the same.

[0002] Cooking appliances are used to prepare food by cooking ingredients. They may also be used to heat food to a temperature suitable for consumption. These cooking appliances can be classified in various ways depending on the type of heat source used, the type of fuel, and so on. For example, cooking appliances can be classified into open and closed types depending on the shape of the space where the ingredients are placed. Closed cooking appliances include ovens and microwave ovens, while open cooking appliances include cooktops and griddles.

[0003] Closed-type cooking appliances shield the space where ingredients are placed with a door and cook food by heating the enclosed space. Open-type cooking appliances place ingredients or containers holding ingredients in an open space and cook food by heating the ingredients or containers. Recently, hybrid cooking appliances that combine both closed and open types are also being used. Hybrid appliances combine multiple heat sources to cook a variety of ingredients and allow for the simultaneous cooking of multiple dishes.

[0004] Such a cooking appliance may be equipped with a knob for operation. The knob may be used to turn the cooking appliance on or off or to set a cooking mode. Additionally, the knob may be used to adjust the heating temperature.

[0005] Taking a gas range or an electric range as an example among cooking appliances, the knob can be operated in a push-and-turn manner to operate the cooking appliance. The push-and-turn knob is implemented so that the cooking appliance can be operated only when the user presses and rotates it. At this time, the user can adjust the heating temperature or select a cooking mode by controlling the amount of rotation around the drive shaft while pressing the knob. Since the cooking appliance can only be operated when both steps are completed, this push-and-turn knob can increase the safety of the cooking appliance.

[0006] However, since this push-and-turn type knob protrudes outward, users may unintentionally rotate it while pressing it. For example, a user's body might come into contact with the knob without them realizing it, causing it to be pressed and rotated simultaneously. Additionally, there is a possibility that an infant could operate the cooking appliance by manipulating the knob. Since unauthorized operation of the knob can lead to fire or burns, it is necessary to further enhance the safety of the cooking appliance.

[0007] The present invention is intended to solve the problems of the prior art as described above, and the objective of the present invention is to prevent the knob assembly from operating when the lock button (safety button) provided in the knob assembly is not pressed.

[0008] Another objective of the present invention is to enable a knob assembly equipped with a locking button to be applied to various types of cooking appliances, such as gas ranges or induction ranges.

[0009] Another objective of the present invention is to ensure that the operating direction of the lock button is formed differently from the rotational direction and the pressing direction of the knob assembly, respectively.

[0010] Another objective of the present invention is to simplify the structure of the knob assembly by minimizing the addition of parts due to the lock button.

[0011] According to a feature of the present invention for achieving the above-mentioned purpose, a knob assembly according to the present invention may include a base portion disposed at the rear of an operating panel and having a stopper protruding forward through the operating panel. The knob assembly may include a knob body that rotates around a driving shaft protruding from the operating panel and moves linearly in the axial direction of the driving shaft.

[0012] The knob assembly may include a locking button that moves along a direction different from the axial direction and has an operating portion exposed to the outside of the knob body. In this case, the locking button may have a knob locking position that interferes with the stopper in the axial direction to restrict the axial movement of the knob body, and a knob unlocking position that moves from the knob locking position to allow the axial movement of the knob body. Since the base portion is positioned at the rear rather than the front of the operating panel, it may be fixed to various structures positioned at the rear of the operating panel, such as a drive unit frame for fixing a gas pipe.

[0013] The base portion may be positioned on the rear of the control panel. The stopper may pass through the control panel and protrude forward along the axial direction.

[0014] A base through-hole may be formed in the base portion. The drive shaft may protrude forward by passing through the base through-hole and the panel through-hole of the control panel, respectively.

[0015] The above drive shaft and the above stopper may extend in a parallel direction.

[0016] A sealing member may be disposed between the base portion and the control panel. The stopper may pass through the sealing member and extend forward of the control panel. The sealing member may be compressed between the base portion and the control panel to seal the space between the base portion and the control panel.

[0017] The base portion may be provided with a recessed portion that is recessed in a direction spaced apart from the rear of the control panel. At this time, the sealing member may be disposed in the recessed portion.

[0018] The above base portion may be provided with a contact protrusion that contacts the rear surface of the above control panel.

[0019] A base through-hole through which the drive shaft passes may be formed in the base portion. The contact protrusion may protrude in the axial direction from the base portion. A plurality of the contact protrusions may be arranged around the base through-hole in the base portion.

[0020] A fastener assembly hole may be formed in the above-mentioned contact protrusion, through which a fastener is inserted by penetrating in the axial direction.

[0021] The plurality of contact protrusions mentioned above can form a contact area on the base portion. The fastener assembly hole may be positioned at a location outside the contact area on the base portion.

[0022] The base portion may include a stopper protruding in the axial direction from a first surface of the base portion, and a mounting arm protruding in the opposite direction to the stopper from a second surface of the base portion formed on the opposite side of the first surface.

[0023] The above-mentioned mounting arm can be coupled to a drive switch located at the rear of the above-mentioned control panel.

[0024] A base through-hole through which the drive shaft passes may be formed in the center of the base portion. A stopper may be disposed in the base portion at a position spaced apart from the base through-hole in a first direction. A base fastening hole may be formed in the base portion at a position spaced apart from the base through-hole in a second direction different from the first direction. The base fastening hole may be fastened to a fastener inserted through the control panel.

[0025] In the knob lock position, the safety pin may be radially spaced from the drive shaft by a first distance. In the knob unlock position, the safety pin may be radially spaced from the drive shaft by a second distance shorter than the first distance. The stopper may be radially spaced from the drive shaft by a distance greater than or equal to the second distance.

[0026] The knob body may include a first knob body that rotates around the drive shaft and has an operating space formed therein for operating the operating part. The knob body may include a second knob body that is coupled inside the first knob body and coupled to the drive shaft.

[0027] A weight plate may be stacked in the axial direction on the second knob body. The safety pin may pass through the weight plate in the axial direction and interfere with the stopper.

[0028] A cooking device according to the present invention may include an operating panel and a heating drive unit disposed at the rear of the operating panel and equipped with a drive shaft. The cooking device may include a base unit disposed between the heating drive unit and the operating panel and equipped with a stopper protruding forward through the operating panel. The cooking device may include a knob body that rotates around the drive shaft and moves linearly in the axial direction of the drive shaft.

[0029] The above cooking device may include a locking button that moves along a direction different from the axial direction and has an operating part exposed to the outside of the knob body. In this case, the locking button may have a knob locking position that interferes with the stopper in the axial direction to restrict the axial movement of the knob body, and a knob unlocking position that moves from the knob locking position to allow the axial movement of the knob body.

[0030] The base portion may include a base plate positioned to face the rear of the control panel and a stopper protruding from the base plate and extending forward of the control panel.

[0031] The base plate may be provided with a mounting piece extending in a direction different from the axial direction. The mounting piece may be supported by the heating drive unit.

[0032] The heating drive unit may be provided with a drive unit frame. The base unit may be fastened to the drive unit frame by means of a fastener assembled at the front of the control panel.

[0033] The above drive unit frame may be provided with a mounting plate facing the base unit. The base unit may be fastened to the mounting plate through the fastener.

[0034] A drive switch may be positioned at the rear of the above-mentioned control panel. The above-mentioned base portion may be provided with a mounting arm that is secured by engaging with the drive switch.

[0035] The mounting arm may extend in the opposite direction to the stopper. The mounting arm may be provided to surround the surface of the drive switch.

[0036] The knob assembly according to the present invention as described above and the cooking device including the same have the following effects.

[0037] In the present invention, the knob body (handle) is not pressed axially unless the lock button is pressed. The user must first press the lock button to apply axial pressure to the knob body and operate the cooking appliance. In this way, arbitrary manipulation or malfunction of the knob assembly can be prevented through the lock button, and thus the safety of the cooking appliance can be improved.

[0038] In addition, in the present invention, the lock button can be operated in a direction different from the axial movement of the knob body. If the direction in which the lock button is pressed and the direction in which the knob body is pressed are formed differently, the possibility of a user accidentally operating the knob assembly can be reduced. This can increase the safety of the cooking appliance.

[0039] In addition, in the present invention, the safety pin of the lock button may interfere with a stopper provided in the base portion of the knob assembly, thereby restricting axial movement. Here, the base portion is positioned at the rear of the control panel, while the stopper protrudes forward and may interfere with the safety pin of the lock button. As such, since the base portion is positioned at the rear rather than the front of the control panel, it can be fixed to various structures positioned at the rear of the control panel, such as a drive unit frame for fixing a gas pipe. Accordingly, the knob assembly of the present invention can be applied to various types of cooking appliances, such as gas ranges or induction ranges, thus having the advantage of high compatibility.

[0040] Furthermore, since the base portion of the present invention is positioned at the rear of the control panel, it may not be exposed to the front of the control panel. Since the base portion is not exposed to the front, the aesthetic appeal of the cooking appliance can be enhanced, and because the shape, size, and position of the base portion can be freely determined, the design freedom of the knob assembly is increased.

[0041] In addition, the base portion of the present invention is provided with a contact protrusion so that it can be in close contact with the rear surface of the control panel. When the contact protrusion is in close contact with the rear surface of the control panel, the base portion is not only firmly fixed to the control panel, but the stopper of the base portion can also maintain an accurate position. Accordingly, the function of the stopper restricting the axial movement of the knob body can be precisely implemented, and the operational reliability of the knob assembly can be improved.

[0042] In addition, the base portion of the present invention is provided with a mounting arm so that it can be coupled to a drive switch positioned at the rear of the control panel. In this way, the base portion is fixed to the rear of the control panel and simultaneously supports the drive switch, thereby facilitating the assembly of the drive switch.

[0043] In addition, a sealing member may be disposed between the base part and the control panel in the present invention. The sealing member is compressed between the base part and the control panel, thereby sealing the area around the panel penetration hole of the control panel and preventing moisture from flowing in toward the drive switch. This can increase the durability of the cooking appliance.

[0044] In addition, in the present invention, a mounting piece is extended from the base portion, and the mounting piece can be fastened to a structure inside the cooking appliance. Since this mounting piece expands in a direction that increases the surface area of ​​the base portion, the base portion can be mounted without changing the position or size of the structure inside the cooking appliance. Therefore, the knob assembly of the present invention has the advantage of high compatibility.

[0045] Furthermore, in the present invention, the operating part of the lock button can move along a straight path or a curved path in a second direction that is different from the axial direction (first direction), which is the linear movement direction of the knob body, and the rotation direction of the knob body, respectively. Accordingly, the possibility of the knob assembly being operated arbitrarily due to user error or interference with objects around the cooking appliance can be further reduced.

[0046] In addition, in the present invention, the lock button may protrude to the side of the knob body. The user can naturally press the lock button protruding to the side in this manner while gripping the knob body. Therefore, even with the addition of a lock button, the operability of the knob assembly is not compromised, and the user can easily operate the cooking appliance.

[0047] Furthermore, in the present invention, the lock button can move linearly between a first position where axial movement is interfered with and a second position where axial movement is possible. At this time, the lock button directly interferes with the base portion of the knob assembly or the operating panel on which the knob assembly is mounted at the first position, thereby restricting axial movement. Therefore, a structure that restricts the operation of the knob assembly can be implemented very simply, and the addition of parts due to the lock button can be minimized.

[0048] Furthermore, in the present invention, the second knob body constituting the knob body can be responsible for coupling with other parts, including the drive shaft (valve shaft). In this way, the first knob body, which is exposed to the outside and gripped by the user, can be made with a relatively simple structure, and shrinkage caused by a complex shape during injection molding can be prevented. Accordingly, the aesthetics and manufacturing quality of the knob assembly can be improved.

[0049] In addition, the present invention is provided with a button holder that operates independently of the lock button, so that the operation of the lock button can be restricted depending on the position of the button holder. For example, the button holder can fix the lock button in the knob release position. In this way, the lock button can be continuously maintained in a state that allows the push operation of the knob assembly. Therefore, the user can activate the lock button only when necessary by operating the button holder, thereby enhancing the convenience of the knob assembly.

[0050] Furthermore, in the present invention, the lock button moves linearly, whereas the button holder can perform rotational movement. When the two parts have different operating structures in this way, the likelihood of a user accidentally operating the knob assembly can be reduced. This can enhance the safety of the cooking appliance.

[0051] FIG. 1 is a perspective view showing an embodiment of a cooking appliance to which a knob assembly according to the present invention is applied.

[0052] FIG. 2 is a perspective view showing the structure of an operating panel and knob assembly constituting an embodiment of the cooking device illustrated in FIG. 1.

[0053] FIG. 3 is a perspective view showing a knob assembly constituting an embodiment of the present invention separated from an operating panel.

[0054] FIG. 4 is an exploded perspective view showing the parts constituting an embodiment of the present invention.

[0055] FIG. 5 is a perspective view showing the parts constituting an embodiment of the present invention disassembled and viewed from an angle different from FIG. 3.

[0056] FIG. 6 is a perspective view showing the rear structure of an operating panel by removing the knob assembly constituting an embodiment of the present invention and viewing the operating panel.

[0057] FIG. 7 is a perspective view showing the combination of a heating driving unit and a base unit constituting an embodiment of the present invention.

[0058] FIG. 8 is a perspective view showing the appearance of a base part constituting an embodiment of the present invention.

[0059] FIG. 9 is a perspective view showing a first knob body constituting an embodiment of a knob assembly according to the present invention and a weight plate omitted.

[0060] FIG. 10 is a perspective view showing an embodiment of the present invention in a first state (knob-locked state).

[0061] FIG. 11 is a cross-sectional view along the line XI-XI' of FIG. 10.

[0062] FIG. 12 is a perspective view showing an embodiment of a knob assembly according to the present invention in a second state (knob loosened state).

[0063] FIG. 13 is a cross-sectional view along the line XIII-XIII' of FIG. 12.

[0064] FIG. 14 is a perspective view showing an embodiment of a knob assembly according to the present invention in a third state (knob pressed state).

[0065] FIG. 15 is a cross-sectional view along the line XV-XV' of FIG. 14.

[0066] FIG. 16 is a perspective view showing an embodiment of a knob assembly according to the present invention in a rotated state.

[0067] FIGS. 17 and FIGS. 18 are a perspective view and a bottom view, respectively, showing a locking button positioned in a knob locking position and a button holder positioned in a button unlocking position, constituting an embodiment of the present invention.

[0068] FIGS. 19 and 20 are a perspective view and a bottom view, respectively, showing a locking button positioned at a knob release position and a button holder positioned at a button release position, constituting an embodiment of the present invention.

[0069] FIGS. 21 and 22 are a perspective view and a bottom view, respectively, showing a locking button positioned in a knob release position and a button holder positioned in a button restraint position, constituting an embodiment of the present invention.

[0070] FIG. 23 is a front view showing the structure of a base part constituting a second embodiment of a cooking device according to the present invention.

[0071] FIG. 24 is a front view showing the structure of a base part constituting a third embodiment of a cooking device according to the present invention.

[0072] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0073] The present invention relates to a knob assembly (100) and a cooking appliance including the same, wherein a cooktop unit (20) including a plurality of heating devices (28) may be provided on the upper part of the cooking appliance. The heating devices (28) may be gas heating devices (28) using gas as an energy source, electric cooktops, or induction ranges. FIG. 1 illustrates, among the heating devices (28), a gas heating device (28) is shown as an example in the cooktop unit (20). As shown in FIG. 1, the heating devices (28) may be positioned so as to be exposed on the upper part of the cooking appliance. As another example, the heating devices (28) may be positioned inside the cooking appliance, or may be positioned inside and outside the cooking appliance, respectively.

[0074] The knob assembly (100) is used to operate the heating device (28). A user can turn the heating device (28) on or off by operating the knob assembly (100). A user can also adjust the amount of heat provided by the heating device (28) by operating the knob assembly (100). Alternatively, a user can operate the knob assembly (100) to operate the oven unit (40, 50) or select a cooking mode of the cooking device.

[0075] The user can control the heating device (28) by pressing and rotating the knob assembly (100). At this time, as shown in FIG. 2, in order to prevent the knob assembly (100) from being arbitrarily operated due to user error or interference with surrounding objects, the present invention is provided with a lock button (140). Depending on the position of the lock button (140), the pushing operation of the knob assembly (100) may be selectively enabled. In addition, a button holder (170) is provided to release the function of the lock button (140) or to restrain the lock button (140) to a specific position. Below, the knob assembly (100) will be described focusing on the lock button (140), the button holder (170), and the malfunction prevention structure.

[0076] In this embodiment, the lock button (140) may have a first button position and a second button position through linear movement. The button holder (170) may have a first holder position and a second holder position through rotation. FIGS. 10 and 11 show the lock button (140) in the first button position, and FIGS. 12 and 13 show the lock button (140) in the second button position. FIG. 17 shows the button holder (170) in the first holder position, and FIG. 19 shows the button holder (170) in the second holder position. The operation of the lock button (140) and the button holder (170) will be described in detail below.

[0077] Looking at the structure of the above cooking device, the exterior of the cooking device is formed by an outer body (10). The outer body (10) can form the frame of the cooking device, excluding a door positioned at the front. A separate inner housing (not shown) may be positioned inside the outer body (10).

[0078] At least one heating device (28) for heating food to be cooked or a container containing food is disposed of in the cooktop unit (20). In this embodiment, a total of four heating devices (28) are disposed of in the cooktop unit (20).

[0079] The above-mentioned cooktop unit (20) may be equipped with a grate (25). The grate (25) is a frame on which a cooking vessel can be placed on the upper side of the heating device (28). The grate (25) is detachably seated on the above-mentioned cooktop unit (20). The grate (25) may be located on the upper side of the heating device (28).

[0080] An operating panel (30) may be positioned above the oven section (40, 50) and in front of the cooktop section (20). The operating panel (30) may include a knob assembly (100) for operating the oven section (40, 50) and the cooktop section (20). Each of the multiple knob assemblies (100) may operate separate heating devices (28) and oven devices. The operating panel (30) may be viewed as an operating device or referred to as a front panel. The operating panel (30) may be positioned at various locations other than in front of the cooktop section (20), such as the bottom of the cooking device, the side of the cooking device, or the top surface of the cooking device.

[0081] The above-mentioned control panel (30) may be equipped with a display unit (60). The display unit (60) may display information about the cooking appliance. The display unit (60) may be composed of a touch panel and may be used by a user to operate the cooking appliance. That is, the display unit (60) may also serve as a type of control unit. As another example, the display unit (60) may be omitted.

[0082] Looking at the oven section (40, 50) above, the oven section (40, 50) may include a plurality of oven devices. In this embodiment, the oven section (40, 50) includes a first oven device (40) and a second oven device (50). The first oven device (40) and the second oven device (50) are arranged at different heights from each other. Separate cooking chambers partitioned from each other may be formed in the first oven device (40) and the second oven device (50).

[0083] The first door (45) of the first oven device (40) may be operated in a pull-down manner in which the upper part rotates up and down around the lower part. As another example, the first door (45) may be operated in a side-swing manner in which it opens sideways. Reference numeral 47 indicates a handle for opening and closing the first door (45).

[0084] The second door (55) of the second oven device (50) can be operated in a sliding manner in the forward and backward directions. As another example, similar to the first door (45) mentioned earlier, the second door (55) can also be operated in a pull-down manner in which the upper part rotates up and down around the lower part. Reference numeral 57 indicates a handle for opening and closing the first door (55).

[0085] Referring to FIG. 4, the drive shaft (71) is coupled to the knob assembly (100). The drive shaft (71) becomes the center of rotation of the knob assembly (100). The drive shaft (71) can rotate together with the knob assembly (100) when the knob assembly (100) rotates. The drive shaft (71) can move linearly together with the knob assembly (100) when the knob assembly (100) moves axially.

[0086] The above drive shaft (71) may be provided in a drive switch (70). The drive switch (70) is coupled to the drive shaft (71) and can be turned on and off according to the rotation angle of the drive shaft (71). The drive switch (70) is coupled to the drive shaft (71) which rotates together with the rotation of the knob assembly (100), so that it can receive the rotational force of the drive shaft (71) and can be turned on and off according to the rotation angle of the drive shaft (71). The drive switch (70) may also be viewed as a type of ignition device.

[0087] When the drive switch (70) is turned ON, an energy source is supplied to the heating device (28). The drive switch (70) is a switch that is turned ON / OFF by a physical contact and can be any switch that does not require an external power source. Here, the energy source can be gas or electricity. If the energy source is electricity, the drive switch (70) can be called a regulator. If the energy source is gas, the drive switch (70) can be an ignition switch, for example, an ignition switch.

[0088] More specifically, the on / off of the drive switch (70) can lead to the on / off of the valve section (75). The valve section (75) is connected to the drive switch (70) and can supply an energy source (gas) to each of the plurality of heating devices (28). A separate knob assembly (100) can be connected to each of the valve sections (75). Reference numeral 76 indicates a supply nozzle through which gas is supplied. The valve section (75) can also be viewed as part of the drive switch (70).

[0089] A main gas pipe (80) may be positioned at the rear of the above-mentioned control panel (30). The main gas pipe (80) can be viewed as a type of gas supply line that receives gas from an external gas supply source (city gas pipeline or LPG container). The gas supplied to the main gas pipe (80) may be branched to the plurality of heating devices (28). Reference numeral 85 indicates a main supply nozzle.

[0090] A drive frame (90) may be mounted on the main gas pipe (80). The drive frame (90) may be connected to the main gas pipe (80) to support the main gas pipe (80). The drive frame (90) may also be viewed as a type of bracket that secures the main gas pipe (80) to the control panel (30) or to a separate structure (not shown) positioned behind the control panel (30).

[0091] The drive unit frame (90) may be provided with a mounting plate (95) facing the base unit (110) to be described later. The base unit (110) may be fastened to the mounting plate (95) through the fastener (B1a). The mounting plate (95) may allow the drive unit frame (90) to have a cross-section in the shape of an L.

[0092] The above drive switch (70), the above valve section (75), and the above main gas pipe (80) can be referred to as a single heating drive unit. The above knob assembly (100) can operate the above heating drive unit to drive the heating device (28). When a user operates the above knob assembly (100), the above valve section (75) opens and gas is supplied to the above heating device (28), and at the same time, a spark is generated through the ignition module (not shown) and the ignition electrode (not shown) to create a flame.

[0093] Meanwhile, the drive shaft (71) can be pushed and rotatably coupled to the drive switch (70). At this time, the drive switch (70) can prevent the drive shaft (71) from rotating when the drive shaft (71) is not pushed. As the drive shaft (71) is pushed and rotated relative to the heating drive unit, the drive switch (70) can supply an energy source to the heating device (28).

[0094] The drive shaft (71) can be operated through the knob assembly (100). More precisely, the drive shaft (71) is coupled to the knob body (NB) and can rotate together with the knob body (NB). The drive shaft (71) can move linearly in the axial direction together with the knob body (NB). Thus, when a user operates the knob assembly (100), the drive switch (70) is driven via the drive shaft (71), and the heating device (28) is operated through this.

[0095] The drive shaft (71) can pass through the front plate (31) and protrude forward. Referring to FIG. 3, a panel through-hole (32) of the front plate (31) through which the drive shaft (71) passes is shown. Through the panel through-hole (32), the drive shaft (71) and the stopper (115), which will be described below, can protrude forward. To this end, the panel through-hole (32) can be formed to be elongated in one direction. The panel through-hole (32) may have an asymmetrical shape with respect to the center. In this embodiment, the part of the panel through-hole (32) through which the drive shaft (71) passes has a wider width than the part through which the stopper (115) passes.

[0096] Next, let us examine the knob assembly (100). For reference, as shown in FIG. 1, in this embodiment, six knob assemblies (100) are arranged on the control panel (30). This is merely one example, and the control panel (30) may be equipped with one to five or seven or more knob assemblies (100). As another example, the knob assembly (100) may be placed directly on the upper surface or side of the cooking appliance rather than on the control panel (30). As yet another example, the knob assembly (100) may be placed on the lower front surface of the cooking appliance.

[0097] As shown in FIG. 2, the knob assembly (100) may include a roughly circular body and a part protruding from the circular body to facilitate gripping. In this embodiment, a lock button (140) is provided on the side of the knob assembly (100). The user must first press the lock button (140) to enable the operation of the knob assembly (100), more precisely, axial movement.

[0098] As shown in FIG. 3, the knob assembly (100) can be separated from the control panel (30). When the knob assembly (100) is separated in the front, i.e., axially, of the control panel (30), the drive shaft (71) can be exposed in a state protruding forward of the control panel (30).

[0099] For reference, the axial direction described below refers to the longitudinal direction of the drive shaft (71, see FIG. 3) and corresponds to the X-axis direction of FIG. 3 to FIG. 5. The rotational direction described below refers to the direction in which the knob assembly (100) rotates around the drive shaft (71) (see arrow in FIG. 16). Furthermore, the radial direction described below refers to the radial direction of the drive shaft (71) and corresponds to the radial direction of the rotation path of the knob assembly (100). The direction in which the lock button (140) moves linearly corresponds to the Y-axis direction of FIG. 3 to FIG. 5. Of course, if the knob assembly (100) rotates, the linear movement direction of the lock button (140) may also change. Also, in this embodiment, the height direction of the knob assembly (100) (based on FIG. 3) corresponds to the Z-axis direction. The X-axis direction corresponds to the rotational axis direction of the button holder (170) described below.

[0100] Referring to FIGS. 4 and 5, the parts of the knob assembly (100) are shown in a disassembled state. Looking at the structure of the knob assembly (100), the knob assembly (100) may be provided with a base part (110). The base part (110) is positioned at the rear of the control panel (30). Accordingly, the base part (110) may not be exposed to the front of the cooking appliance, i.e., towards the user. In addition, even if the knob assembly (100) is separated from the drive shaft (71), the part of the base part (110), excluding the stopper (115), may be covered by the front plate (31).

[0101] For convenience of explanation, we will first examine the base portion (110) with reference to FIGS. 6 to 8. The base portion (110) is positioned on the rear side of the control panel (30). The base portion (110) is positioned between the control panel (30) and the drive switch (70). The base portion (110) is positioned on the opposite side of the knob assembly (100) with the control panel (30) in between. However, the stopper (115) of the base portion (110) passes through the control panel (30) and protrudes forward along the axial direction.

[0102] The base portion (110) can (i) provide a locking function for the knob assembly (100) by having the stopper (115), (ii) seal the area around the panel through hole (32) to prevent moisture from flowing in toward the drive switch (70), and (iii) surround the drive shaft (71) to align the drive shaft (71).

[0103] More specifically, the base portion (110) may include a base plate (110a) positioned to face the rear of the control panel (30). The base plate (110a) is configured in a roughly plate-like structure. The base plate (110a) includes a first surface facing forward, i.e., the rear of the control panel (30), and a second surface facing backward, i.e., the drive switch (70).

[0104] Referring to FIG. 8, a base through-hole (111) may be formed in the center of the base plate (110a). The base through-hole (111) penetrates the base plate (110a) in the axial direction. The base through-hole (111) may protrude the drive shaft (71) forward. To this end, the base through-hole (111) may be aligned axially with the panel through-hole (32).

[0105] The base plate (110a) may be provided with a mounting piece (110b). The mounting piece (110b) extends from one end of the base plate (110a) in a direction that expands the area of ​​the base portion (110). Based on FIG. 8, the mounting piece (110b) extends upward from the base plate (110a). The mounting piece (110b) may have a shape in which the width narrows towards one end.

[0106] The mounting piece (110b) can be supported on the drive unit frame (90). More precisely, the mounting piece (110b) is supported on the mounting plate (95) of the drive unit frame (90). The mounting piece (110b) can be fastened to the mounting plate (95) through the mounting fastener (B1a, see FIG. 6). To this end, a base fastening hole (112) may be formed in the mounting piece (110b). The mounting fastener (B1a) can be assembled to the mounting plate (95) after passing through the hole (not shown) of the front plate (31) and the base fastening hole (112) in sequence.

[0107] The mounting piece (110b) may be provided to extend outward from the area partitioned by the four corners of the base plate (110a). The mounting piece (110b) is formed in a direction that expands the area of ​​the base portion (110), and extends outward while forming the same plane as the base plate (110a). In this way, the mounting piece (110b) can be mounted on the drive unit frame (90) on the outside of the base plate (110a), avoiding the drive switch (70).

[0108] More precisely, the plurality of contact protrusions (116) described below form a contact area in the base portion (110), and the base fastening hole (112) may be positioned outside the contact area in the base portion (110).

[0109] A stopper (115) is provided on the base portion (110). The stopper (115) protrudes axially from the first surface of the base portion (110). The stopper (115) may have a roughly cantilevered structure. Referring to FIG. 11, the stopper (115) may interfere with the safety pin (150), which will be described below, to prevent the knob assembly (100) from moving axially. When the lock button (140) is pressed and moved to the knob unlock position, the stopper (115) and the safety pin (150) become misaligned with each other, allowing the knob assembly (100) to move axially.

[0110] That is, as shown in FIG. 11, in the knob lock position, the stopper (115) is aligned with the safety pin (150) in the axial direction and interferes with it. Looking at FIG. 13, in the knob unlock position, the stopper (115) is positioned out of alignment with the safety pin (150) in the axial direction and the interference is released. In this way, depending on the position of the lock button (140), the safety pin (150) may interfere with the stopper (115) or the interference may be released.

[0111] In the base portion (110), the stopper (115) may be positioned at a location spaced apart from the base through hole (111) in a first direction. Here, the first direction is upward, i.e., the 12 o'clock direction, based on FIG. 8. In the base portion (110), a base fastening hole (112) may be formed at a location spaced apart from the base through hole (111) in a second direction different from the first direction. Here, the second direction is to the left, i.e., the 9 o'clock direction, based on FIG. 8. Thus, if the base fastening hole (112) is positioned at a location spaced apart from the stopper (115) in a different direction relative to the base through hole (111), the base fastening hole (112) may be positioned at a location that does not interfere with the drive switch (70), etc.

[0112] In the above knob lock position, the safety pin (150) is radially spaced from the drive shaft (71) by a first distance (state of FIG. 11), and in the above knob unlock position, the safety pin (150) can be radially spaced from the drive shaft (71) by a second distance shorter than the first distance (state of FIG. 13). At this time, the stopper (115) can be radially spaced from the drive shaft (71) by a distance greater than or equal to the second distance.

[0113] The drive shaft (71) and the stopper (115) can be extended in parallel directions. As shown in FIG. 3, the drive shaft (71) and the stopper (115) each protrude forward (in the X-axis direction). When the drive shaft (71) and the stopper (115) protrude in the same direction, the stopper (115) can be extended toward the knob assembly (100) to perform an interference function, and the stopper (115) and the drive shaft (71) can both protrude forward using a single hole (panel through hole (32)).

[0114] The base portion (110) may be provided with a contact protrusion (116). The contact protrusion (116) protrudes axially from the base plate (110a) and contacts the rear surface of the control panel (30). The contact protrusion (116) eliminates the gap between the base portion (110) and the control panel (30), thereby allowing the base portion (110) to be more stably fixed to the control panel (30).

[0115] In the base portion (110), the plurality of contact protrusions (116) may be arranged around the base through-hole (111). In this embodiment, the contact protrusions (116) are composed of a total of four, and the four contact protrusions (116) are arranged around the base through-hole (111). More precisely, the four contact protrusions (116) are arranged at each vertex of a roughly square. In this way, the four contact protrusions (116) can ensure that the base through-hole (111) is accurately aligned with the panel through-hole (32). As another example, the contact protrusions (116) may be composed of three or fewer, or five or more.

[0116] The plurality of contact protrusions (116) can define a contact area on the base portion (110). Here, the contact area refers to a virtual area formed between the plurality of contact protrusions (116) when the plurality of contact protrusions (116) are connected to each other. This contact area may also be viewed as an area where the base portion (110) is in contact with the rear surface of the control panel (30).

[0117] A fastener assembly hole (113) may be formed in the above-mentioned contact protrusion (116) so as to penetrate in the axial direction and into which a fastener (B1b) is inserted. In this embodiment, a fastener assembly hole (113) is formed in some of the above-mentioned contact protrusions (116). Based on FIG. 8, the fastener assembly hole (113) is formed in two contact protrusions (116). Referring to FIG. 6, auxiliary fasteners (B1b) are fastened to the fastener assembly hole (113). The auxiliary fasteners (B1b) pass through the front plate (31) and are assembled into the fastener assembly hole (113). Accordingly, the above-mentioned contact protrusion (116) can be more strongly fixed to the rear surface of the front plate (31).

[0118] A mounting arm (117) protruding in the opposite direction to the stopper (115) may be provided on the second surface of the base portion (110) formed on the opposite side of the first surface. The mounting arm (117) may have a cantilever hook structure. The mounting arm (117) may be coupled to the drive switch (70) positioned at the rear of the control panel (30). Here, coupling means that the mounting arm (117) hooks the drive switch (70), and the base portion (110) supports the drive switch (70).

[0119] Referring to FIG. 7, a total of four mounting arms (117) surround the side edges of the drive switch (70). The mounting arms (117) can elastically support the drive switch (70) through elastic deformation during the assembly process. By wrapping and securing the drive switch (70) with the mounting arms (117), the drive switch (70) can be fixed to the base part (110). Therefore, the drive switch (70) can be fixed to the control panel (30) without the need for separate fasteners (screws, etc.).

[0120] Referring to FIG. 7, a mounting fence (118) may be provided on the lower part of the second surface of the base portion (110). The mounting fence (118) may protrude in the axial direction to support the lower part of the drive switch (70). The mounting fence (118) may secure the drive switch (70) together with the mounting arms (117). Although not shown, the mounting fence (118) may also be provided on the upper part to support the upper part of the drive switch (70).

[0121] Referring to FIGS. 6 and FIGS. 8, a sealing member (SM) may be disposed between the base portion (110) and the control panel (30). The sealing member (SM) is compressed between the base portion (110) and the control panel (30) to seal the space between the base portion (110) and the control panel (30). The sealing member (SM) may be made of a material capable of elastic deformation and sealing function, such as sponge, silicone, or rubber.

[0122] The sealing member (SM) may have a roughly plate-like structure. The sealing member (SM) can seal the area around the base through-hole (111) by being compressed in a direction that widens the surface area between the base portion (110) and the control panel (30). Accordingly, moisture can be prevented from entering through the base through-hole (111) from the front of the front plate (31).

[0123] The sealing member (SM) can pass through the stopper (115) and the drive shaft (71). Referring to FIG. 8, a first member hole (SMa) and a second member hole (SMb) are formed in the sealing member (SM). The first member hole (SMa) passes through the drive shaft (71), and the second member hole (SMb) passes through the stopper (115). To this end, the first member hole (SMa) and the second member hole (SMb) may each have a shape corresponding to the cross-sectional shape of the drive shaft (71) and the stopper (115).

[0124] The side of the sealing member (SM) may be surrounded by the contact protrusions (116). As shown in FIG. 6, the curved portions of the side of the sealing member (SM) are each surrounded by the contact protrusions (116). The contact protrusions (116) press against the side of the sealing member (SM), thereby increasing the compression amount of the sealing member (SM) and thereby increasing the sealing performance of the sealing member (SM).

[0125] In this embodiment, the base portion (110) is provided with a recessed portion (not given a reference numeral) that is recessed in a direction spaced apart from the rear surface of the control panel (30), and the sealing member (SM) is disposed in the recessed portion. The recessed portion can be viewed as a portion that is relatively recessed compared to the contact protrusion (116) on the first surface of the base portion (110).

[0126] Next, looking at the structure of the knob body (NB) and lock button (140) constituting the knob assembly (100), the skeleton of the knob assembly (100) can be formed by the knob body (NB). The knob body (NB) can surround the drive shaft (71) and the base part (110). The knob body (NB) is the part that the user grips. In this embodiment, the knob body (NB) is composed of a first knob body (120) and a second knob body (130). The first knob body (120) can be exposed to the outside. The second knob body (130) can be placed inside the first knob body (120).

[0127] In this embodiment, the first knob body (120) may be exposed to the outside and serve as the part where the user operates the knob assembly (100). The second knob body (130) may be positioned inside the first knob body (120) and may perform various functions. For example, the second knob body (130) may perform various functions such as (i) coupling with the drive shaft (71), (ii) forming an operating space (121b), (iii) supporting the elastic member (S) and button holder (170), and (iv) fixing the weight plate (160). The functions and structure of the second knob body (130) will be examined again below.

[0128] The first knob body (120) may have a roughly cylindrical shape. A coupling space (121a, illustrated in FIG. 5), which is a type of empty space, may be formed inside the first knob body (120). The coupling space (121a) may be open toward the control panel (30). A second knob body (130), a part of a lock button (140), a weight plate (160), and a button holder (170), etc., may be placed in the coupling space (121a). The coupling space (121a) may also be viewed as a type of internal space or storage space.

[0129] The first knob body (120) may include a first knob ring (121) in the shape of a truncated cone or a cylinder. The first knob ring (121) is positioned to face the front plate (31). The first knob ring (121) may wrap around a portion of the side of the second knob body (130) so as not to expose the second knob body (130) to the outside, or to minimize the area exposed to the outside.

[0130] A gripping portion (123) may protrude from the upper part of the knob ring (121). The gripping portion (123) protrudes axially from the upper part of the knob ring (121). The gripping portion (123) may be a part that is gripped by a user. The gripping portion (123) may be extended in a direction perpendicular to the axial direction (refer to the Z-axis direction in FIG. 2). The gripping portion (123) has a narrower width than the knob ring (121) and protrudes axially. Reference numeral 123a is a reference scale formed on the gripping portion (123). Although not shown, a scale may also be marked on the surface of the knob ring (121).

[0131] A knob top plate (122) may be provided between the knob ring (121) and the gripping portion (123). The knob top plate (122) has a plate-like structure formed in a direction orthogonal to the axial direction. The knob top plate (122) may be provided on each side of the gripping portion (123) with the gripping portion (123) as the center. Referring to FIG. 5, the coupling space (121a) can be seen as a space defined by the knob ring (121) and the knob top plate (122).

[0132] An operating space (121b) may be formed inside the gripping portion (123). The operating space (121b) is a space formed by the inner part of the gripping portion (123) being recessed. A part of the lock button (140) may be placed in the operating space (121b). In this embodiment, an operating part (143), which is a part of the lock button (140), is placed in the operating space (121b). The operating part (143) can move linearly along the operating space (121b). The operating space (121b) may be connected to the coupling space (121a). Since the fastening plate (FP, see FIG. 5) described later blocks a part of the entrance across the operating space (121b), the operating space (121b) can be seen as being defined by the first knob body (120) and the second knob body (130).

[0133] An operating hole (125) may be formed through the knob body (NB) in a direction orthogonal to the axial direction. In this embodiment, the operating hole (125) is formed in the first knob body (120). Referring to FIG. 3, the operating part (143) of the lock button (140) is exposed to the outside through the operating hole (125), so that the operating part (143) can form the exterior of the knob assembly (100) together with the knob body (NB). That is, it can be seen that a part of the lock button (140) fills the operating hole (125).

[0134] The lock button (140) may be restricted from moving by interfering with the edge of the operating hole (125) during the process of moving from the second button position (knob unlock position) to the first button position (knob lock position). The lock button (140) may be caught on the edge of the operating hole (125) and remain in the operating space (121b) formed inside the first knob body (120) without being completely separated from the knob body (NB).

[0135] The above-mentioned operating hole (125) may be formed on only one of the left and right sides of the first knob body (120). In this embodiment, the operating hole (125) is formed on the left side of the first knob body (120). In this embodiment, since only one lock button (140) is provided, the operating hole (125) also needs to be formed on only one side of the first knob body (120). As another example, the operating hole (125) may be formed on the right side of the first knob body (120). As yet another example, the operating hole (125) may be formed on the left and right sides of the first knob body (120), respectively.

[0136] Looking at the second knob body (130), the second knob body (130) can be placed in the coupling space (121a) of the first knob body (120). The second knob body (130) can be coupled to the first knob body (120). The second knob body (130) can be adhered to the first knob body (120) by an adhesive layer. Accordingly, the first knob body (120), the second knob body (130), and the weight plate (160) described later can be assembled together and operated together.

[0137] Referring to FIGS. 4 and 5, the second knob body (130) may be provided with a shaft coupling part (131) to which one end of the drive shaft (71) is coupled. The shaft coupling part (131) may be approximately cylindrical in shape. The shaft coupling part (131) may be positioned at the center of the knob body (NB). A shaft coupling hole (132) is formed in the shaft coupling part (131), and the drive shaft (71) may be inserted into the shaft coupling hole (132). The drive shaft (71) may be fixed inside the shaft coupling hole (132) without rotating freely inside the shaft coupling hole (132).

[0138] When one end of the drive shaft (71) is inserted into the shaft coupling hole (132), the drive shaft (71) rotates together with the second knob body (130) and can move axially together with the second knob body (130). That is, when the second knob body (130) is driven together with the first knob body (120), the drive shaft (71) is also driven together. For example, when the second knob body (130) is pushed axially together with the first knob body (120), the drive shaft (71) also moves axially. When the second knob body (130) rotates around the drive shaft (71) together with the first knob body (120), the drive shaft (71) also rotates together. Therefore, the drive shaft (71) may be referred to as a rotation shaft.

[0139] The second knob body (130) is coupled to the drive shaft (71) and can also be coupled to the weight plate (160). Since a coupling structure with other parts is implemented in the second knob body (130) in this way, the first knob body (120) can be made into a relatively simple and thin structure. Therefore, when the first knob body (120) is injection molded, the phenomenon of sink marks or flow marks being formed due to shrinkage of a part of the first knob body (120) caused by the complex shape can be prevented.

[0140] Referring to FIG. 5, the second knob body (130) may be provided with a recessed avoidance portion (133') along the direction of movement of the lock button (140). The avoidance portion (133') may provide a movement path for the lock button (140). The avoidance portion (133') may guide the movement of the lock button (140) so that the lock button (140) moves in a straight line in a certain direction without being twisted to one side.

[0141] The second knob body (130) may be provided with a body plate (133). The body plate (133) has a roughly plate-like structure. The shaft coupling part (131) is connected to the body plate (133). The body plate (133) is a part that is coupled to the first knob body (120) and the weight plate (160). To this end, the body plate (133) may (i) be fastened to the first knob body (120), (ii) be bonded to the first knob body (120), and (iii) be fastened to the weight plate (160) by a second fastener (B2). A fastener through hole (not given a reference numeral) into which the second fastener (B2) is assembled is formed in the body plate (133).

[0142] In this embodiment, the body plate (133) is approximately semicircular in shape corresponding to the shape of the coupling space (121a). That is, a portion of the side of the second knob body (130) facing the inner surface of the coupling space (121a) has a curved shape, and another portion of the side of the second knob body (130) facing the lock button (140) has a flat shape. The curved portion faces the inner surface of the coupling space (121a), and the flat portion faces the lock button (140). A portion of the lock button (140) may interfere with the flat portion of the second knob body (130). The body plate (133) may include a body fastening hole (134) into which the second fastener (B2) is fastened.

[0143] Referring to FIG. 9, the edge of the second knob body (130) may be provided with a flow prevention fence (135) protruding along the axial direction. The surface of the flow prevention fence (135) is positioned to face the surface of the first knob body (120), so that the second knob body (130) can maintain a state in which it is firmly in contact with the first knob body (120) in the X-axis and Z-axis directions.

[0144] Referring to FIGS. 9 and FIGS. 11, the second knob body (130) may be provided with a support plate (136). The support plate (136) protrudes along the axial direction toward the opposite side of the base portion (110). The support plate (136) protrudes from the body plate (133) in a roughly plate-like shape. The support plate (136) may be extended in the same direction as the gripping portion (123), that is, in a direction perpendicular to the axial direction. One end of the support plate (136) may be in close contact with the inner surface of the first knob body (120), that is, the inner surface of the gripping portion (123). Such an appearance is illustrated in FIG. 11.

[0145] The support plate (136) can be placed between a pair of elastic members (S) to be described later. Referring to FIG. 9, the support plate (136) is placed between a pair of elastic members (S) to maintain a gap between the pair of elastic members (S). That is, the support plate (136) can prevent the pair of elastic members (S) from twisting to one side during the contraction / expansion process.

[0146] The remaining part of the second knob body (130), excluding the shaft coupling part (131), and the lock button (140) may be positioned on opposite sides of the shaft coupling part (131). More precisely, the body plate (133) and the lock button (140) may be positioned on opposite sides of the drive shaft (71). Referring to FIG. 11, with respect to the drive shaft (71), the body plate (133) is positioned on the left and the lock button (140) is positioned on the right. This prevents the center of gravity of the knob assembly (100) from shifting to one side due to the lock button (140). Additionally, the body plate (133) fills the empty space on one side of the coupling space (121a) where the lock button (140) is not located, thereby increasing the overall durability of the knob assembly (100).

[0147] Referring to FIGS. 4 and 5, the second knob body (130) may be provided with a fastening plate (FP). The fastening plate (FP) may be connected to the body plate (133) and may be in close contact with the first knob body (120). The fastening plate (FP) may be positioned across the operating space (121b). It may be seen that the body plate (133) is connected to one end of the fastening plate (FP). The fastening plate (FP) may be provided on each side of the avoidance portion (133'), centered around the avoidance portion (133').

[0148] Referring to FIG. 9, the second knob body (130) may be provided with a support projection (138) protruding along the axial direction. The support projection (138) protrudes axially from the body plate (133). The support projection (138) may protrude in the same direction as the flow prevention fence (135) and the supporter part (136).

[0149] The support protrusion (138) is positioned below the elastic member (S) to support the elastic member (S). The elastic member (S) may be positioned between the upper surface (138a) of the support protrusion (138) and the surface of the first knob body (120). Reference numeral 138a indicates the upper surface of the support protrusion (138), and the upper surface (138a) may serve as the support surface of the elastic member (S). The upper surface (138a) may have an inclined surface structure along the elastic deformation direction of the elastic member (S).

[0150] Referring again to FIGS. 4 and FIGS. 5, the knob assembly (100) is provided with a lock button (140). The lock button (140) is positioned on the knob body (NB) and may be dependent on the operation of the knob body (NB). Basically, when the knob body (NB) moves linearly in the axial direction or rotates around the drive axis (71), the lock button (140) may move linearly and rotate together with the knob body (NB). However, the lock button (140) may move independently from the knob body (NB) along a direction different from the axial direction.

[0151] The lock button (140) may form part of the gripping surface that the user grips when gripping the knob assembly (100). For example, when the user grips the knob assembly (100) with their thumb and index finger, they may grip the surface of the gripping part (123) with their index finger while simultaneously gripping the operating part (143) of the lock button (140) with their thumb. In this state, when the user presses the knob assembly (100) with their thumb and index finger, the surface of the gripping part (123) remains fixed, but the operating part (143) formed on the opposite side is pressed and can be moved inward into the knob body (NB).

[0152] As shown in FIG. 11, the lock button (140) can be positioned on the opposite side of the second knob body (130) excluding the shaft coupling part (131), with respect to the shaft coupling part (131). More precisely, the body plate (133) and the lock button (140) can be positioned on opposite sides of each other with respect to the drive shaft (71).

[0153] The lock button (140) may restrict the movement of the knob body (NB), the weight plate (160), and the lock button (140) constituting the knob assembly (100) in the axial direction, i.e., in the direction of the control panel (30), or may release the restriction on movement. The lock button (140) may have a first button position in which axial movement is restricted by interference from the base part (110), and a second button position in which axial movement is possible. Accordingly, the first button position may be referred to as the knob lock position, and the second button position may be referred to as the knob unlock position.

[0154] Here, the knob lock position is a state in which the lock button (140) protrudes relatively from the knob body (NB), which is the state of FIGS. 10 and FIGS. 11. The lock button (140) is positioned at the radially furthest position from the drive shaft (71) in the knob lock position. At the same time, the knob lock position refers to the position in which the safety pin (150) is positioned at the radially furthest position from the drive shaft (71). The knob unlock position is the position moved from the knob lock position when the lock button (140) is pressed, which is the state of FIGS. 12 and FIGS. 13. The lock button (140) is positioned closest to the drive shaft (71) along the radial direction in the knob unlock position. At the same time, the knob unlock position refers to the position in which the safety pin (150) is positioned closest to the drive shaft (71) in the radial direction.

[0155] The lock button (140) may interfere axially with the stopper (115) of the base part (110) at the knob lock position. Here, interference means that the axial movement of the lock button (140) is restricted. In this way, if the lock button (140) is interfered axially by the stopper (115), the lock button (140) may not be able to move along the axial direction toward the control panel (30), or the distance of movement may be limited.

[0156] The knob body (NB) and the lock button (140) are constrained to each other in the axial direction, so that the knob body (NB) and the lock button (140) can move linearly together along the axial direction. Since the lock button (140) is constrained to the knob body (NB) in the axial direction, if the axial movement of the lock button (140) is restricted, the axial movement of the entire knob body (NB) is also restricted.

[0157] At this time, the lock button (140) may move linearly along a direction different from the axial direction between the knob lock position and the knob unlock position. In this embodiment, the lock button (140) may reciprocate between the knob lock position and the knob unlock position while moving in a direction orthogonal to the axial direction. As another example, the lock button (140) may move in an oblique direction having a predetermined angle with respect to the axial direction. As yet another example, the lock button (140) may move along a curved path with respect to the axial direction.

[0158] Referring to FIGS. 4 and 5, the lock button (140) may include a button body (141). The button body (141) may be inserted into the coupling space (121a). The button body (141) may extend in a direction orthogonal to the axial direction. The side of the button body (141) may have a curved shape corresponding to the inner surface of the coupling space (121a).

[0159] The above button body (141) may be provided with an operating part (143). The operating part (143) is a part that a user presses to operate the button body (141). At least a portion of the operating part (143) may be exposed to the outside of the knob assembly (100) through the operating hole (125) to form a gripping surface.

[0160] The above-mentioned operating part (143) can be extended in an upright direction from the button body (141). Here, the upright direction is the up and down direction based on FIG. 9. The above-mentioned operating part (143) is placed in the operating space (121b) and can be moved along the operating space (121b).

[0161] The above operating part (143) may be provided with the above protruding end (145). The above protruding end (145) may extend from the operating part (143) in a direction orthogonal to the direction in which the operating part (143) extends from the button body (141). The above protruding end (145) may increase the support area between the surface of the operating part (143) and the surface of the knob body (NB). By means of the above protruding end (145), the lock button (140) can be operated stably in a certain direction (left and right direction based on FIG. 11).

[0162] Referring to FIG. 9, the protruding end (145) may be provided with a protruding rib (145a). The protruding rib (145a) reduces the contact area between the protruding end (145) and the inner surface of the first knob body (120), thereby reducing friction during the movement of the lock button (140). The protruding rib (145a) may extend along the direction of movement of the lock button (140). The protruding rib (145a) protrudes toward the inner surface of the operating space (121b) of the first knob body (120). Therefore, the portion of the protruding end (145) that contacts the inner surface of the operating space (121b) of the first knob body (120) may be concentrated on the protruding rib (145a). The protruding rib (145a) may be composed of multiple pieces to prevent the lock button (140) from tilting to one side.

[0163] Referring again to FIG. 5 and FIG. 11, the lock button (140) may be provided with a safety pin (150) that interferes with or is released from interference with the stopper (115). The safety pin (150) may protrude further along the axial direction toward the stopper (115) than the lock button (140). The safety pin (150) may protrude approximately in a cantilever shape from the button body (141). At the knob lock position, the safety pin (150) becomes the part that substantially interferes with the stopper (115). The safety pin (150) may be integrally formed with the button body (141), or the safety pin (150) may be formed as a separate part and assembled to the button body (141).

[0164] As shown in FIG. 11, the safety pin (150) may interfere with the stopper (115) of the base part (110). In the knob lock position, the stopper (115) interferes with the safety pin (150) by being aligned with each other in the axial direction. Referring to FIG. 13, in the knob unlock position, the stopper (115) is positioned to be offset from the safety pin (150) in the axial direction, thereby releasing the interference. Thus, depending on the position of the lock button (140), the safety pin (150) may interfere with the stopper (115) or the interference may be released.

[0165] Referring again to FIGS. 4 and 5, a weight plate (160) that rotates and moves together with the knob body (NB) may be coupled to the knob body (NB). The weight plate (160) may have a disc structure corresponding to the coupling space (121a). The weight plate (160) can increase the overall weight of the knob assembly (100) to improve the operability of the knob assembly (100). To this end, the weight plate (160) may be made of a metal material.

[0166] A shaft through hole (161) into which the drive shaft (71) is inserted may be formed through the center of the weight plate (160). Around the shaft through hole (161), a plate fastening hole (167) through which a second fastener (B2) passes may be formed. In this embodiment, the weight plate (160) is assembled to the second knob body (130) by the second fastener (B2).

[0167] The weight plate (160) is positioned below the lock button (140) to prevent the lock button (140) from being disassembled. The weight plate (160) may interfere axially with the lock button (140) so that the lock button (140) is not separated axially.

[0168] A pin through hole (165) may be formed through the weight plate (160). The pin through hole (165) is the portion through which the safety pin (150) passes. Since the safety pin (150) must move between the knob lock position and the knob unlock position, the pin through hole (165) may extend along the radial direction of the weight plate (160). The safety pin (150) can move between the knob lock position and the knob unlock position while inserted into the pin through hole (165). The pin through hole (165) may also be connected to the shaft through hole (161).

[0169] The knob body (NB) is provided with a button holder (170). The button holder (170) is intended to restrain the lock button (140) to a specific position or to release the restraint. More precisely, the button holder (170) can release the function of the lock button (140) so that the knob assembly (100) can operate in a normal push-and-turn manner even if the lock button (140) is not operated. As another example, the button holder (170) may be omitted.

[0170] The button holder (170) can move between a button release position (first holder position) and a button restraint position (second holder position) while rotating in a position placed on the knob assembly (100). Here, the button release position refers to a state in which the lock button (140) can move between the knob lock position and the knob release position. The button restraint position refers to a state in which the button holder (170) interferes with the lock button (140), so that the lock button (140) is restrained to a specific position, for example, the knob release position. In this way, in the present embodiment, the button holder (170) can disable the function of the lock button (140) by restraining the lock button (140) to a specific position. If the user does not want the function of the lock button (140), that is, the knob assembly (100) to be in a locked state, the button holder (170) can be moved to the button release position.

[0171] The button holder (170) may not be exposed to the outside of the knob body (NB). More precisely, as shown in FIG. 2, when the knob assembly (100) is mounted on the control panel (30), the button holder (170) is not exposed to the outside. This is because the knob body (NB) surrounds the button holder (170). Therefore, in order for a user to operate the button holder (170), the user must first detach the knob assembly (100) from the drive shaft (71) and then operate the button holder (170). This structure will be explained again below.

[0172] The button holder (170) can be rotated independently of the first knob body (120) and the second knob body (130). The button holder (170) can also be rotated independently of the lock button (140). The user can restrict the operation of the lock button (140) by rotating only the button holder (170) in the knob assembly (100).

[0173] If the weight plate (160) is considered as part of the knob body (NB), the button holder (170) may be considered to be placed on the knob body (NB). As another example, the weight plate (160) may be omitted, and the button holder (170) may be placed on the knob body (NB). When the button holder (170) is placed on the knob body (NB), the button holder (170) can be guided by the knob body (NB) and rotate to move between a button release position and a button restraint position.

[0174] Looking at the structure of the button holder (170), the button holder (170) includes a holder body (172) that is approximately ring-shaped. A holder through-hole (170a) is formed at the center of the holder body (172). The holder body (172) can wrap around the outer surface of the weight plate (160). The holder body (172) can rotate along the outer surface of the weight plate (160). That is, the button holder (170) is coupled to wrap around the outer surface of the weight plate (160) and can rotate around the weight plate (160). Looking at FIGS. 3 and 4, the holder body (172) has a larger diameter than the weight plate (160). At the same time, the holder body (172) may have a smaller diameter than the knob ring (121) of the first knob body (120). Accordingly, the holder body (172) may be surrounded by the knob ring (121) and not exposed.

[0175] The holder body (172) may be provided with a rotation guide (172a). The rotation guide (172a) protrudes radially from one end of the holder body (172) toward the center of the button holder (170). The rotation guide (172a) rests on the surface of the weight plate (160). Based on FIG. 12, the rotation guide (172a) rests on the upper surface of the weight plate (160). The rotation guide (172a) can prevent the button holder (170) from moving away in the direction toward the control panel (30) (downward in FIG. 11). The rotation guide (172a) may be provided as a continuous circular shape formed on the edge of the holder body (172), or as a discontinuously formed arc shape.

[0176] A portion of the button holder (170) may be positioned between the weight plate (160) and the first knob body (120). Referring to FIG. 11, a rotation guide (172a) of the button holder (170) is positioned between the weight plate (160) and the first knob body (120). The button holder (170) may be positioned in a rotatable state between the weight plate (160) and the first knob body (120). Alternatively, the button holder (170) may be positioned between the weight plate (160) and the second knob body (130).

[0177] Referring to FIG. 18, the button holder (170) may be provided with a locking rib (173). The locking rib (173) protrudes further in the direction of the rotation center of the button holder (170) than the rotation guide (172). The locking rib (173) increases the surface area of ​​the button holder (170) that engages with the weight plate (160), thereby allowing the button holder (170) to rotate more stably. Additionally, the locking rib (173) may serve to limit the rotation angle of the button holder (170) when the button holder (170) rotates relative to the knob body (NB). This structure will be explained again below.

[0178] Referring again to FIGS. 4 and FIGS. 5, the button holder (170) may be provided with a holder handle (174). The holder handle (174) may protrude axially from the edge of the button holder (170) toward the control panel (30). The holder handle (174) becomes the part that the user grips when rotating the button holder (170). The holder handle (174) may be made to protrude axially and radially so that the user can easily grip it. As another example, the holder handle (174) may be omitted, and the user may rotate the button holder (170) itself.

[0179] The holder body (172) may be provided with an interference part (175). The interference part (175) is positioned in the movement path of the lock button (140) at the button restraint position of the button holder (170). The interference part (175) supports one side of the lock button (140) that has moved to the knob lock position, thereby preventing the lock button (140) from moving back to the knob unlock position.

[0180] The interference part (175) may protrude radially toward the center of rotation of the button holder (170). When the button holder (170) protrudes radially, the direction in which the interference part (175) faces may also change according to the angle of rotation of the button holder (170). For example, the interference part (175) may be positioned in the movement path of the lock button (140) at the button restraint position of the button holder (170) and protrude toward the lock button (140).

[0181] The interference portion (175) may have a length that protrudes in the radial direction along the circumferential direction of the button holder (170). With reference to FIG. 18, the length that protrudes in the radial direction of the interference portion (175) gradually increases along the clockwise direction. More precisely, the length that protrudes in the radial direction of the interference portion (175) increases along the direction opposite to (counterclockwise in FIG. 18) the direction in which the button holder (170) rotates toward the button restraint position (counterclockwise in FIG. 18). In this way, when the button holder (170) is rotated, the force required to overcome the elastic force of the elastic member (S) is distributed, thereby improving operability.

[0182] A position fixing portion (178) may be formed in the interference portion (175) in the radial direction of the button holder (170). The position fixing portion (178) may allow the interference portion (175) to be fixed in the button restraint position or the button release position. In this embodiment, the position fixing portion (178) is recessed radially outward from the surface of the interference portion (175) toward the button holder (170). Referring to FIG. 18, the position fixing portion (178) is recessed radially from the outer surface of the interference portion (175).

[0183] The position fixing part (178) may be coupled to a relative fixing part (138, 148) provided in at least one of the knob body (NB) or the lock button (140). The relative fixing part (138, 148) may be inserted into the position fixing part (178) to fix the button holder (170) in the circumferential direction. The button holder (170) engaged with the relative fixing part (138, 148) may not rotate arbitrarily along the circumferential direction, but may only rotate when an external force is applied by the user.

[0184] The above relative fixing parts (138, 148) may include a first relative fixing part (138) and a second relative fixing part (148). The first relative fixing part (138) is provided in a position facing the position fixing part (178) on the knob body (NB). The first relative fixing part (138) is inserted into the position fixing part (178) to fix the button holder (170) to the button release position.

[0185] The second relative fixing part (148) may be provided on the lock button (140). The second relative fixing part (148) may protrude from the lock button (140) in the direction of movement of the lock button (140). The second relative fixing part (148) may be coupled with the position fixing part (178) at the button restraint position so that the button holder (170) may be fixed at the button restraint position. Referring to FIG. 22, the position fixing part (178) coupled to the second relative fixing part (148) can be seen.

[0186] Referring to FIG. 9, the operation of the knob body (NB) and the lock button (140) can be examined. The lock button (140) can be pressed in the direction of arrow ①. When the lock button (140) is pressed in the direction of arrow ①, the lock button (140) moves from the knob lock position to the knob unlock position. For reference, in FIG. 9, the lock button (140) is positioned in the knob lock position, so axial movement is restricted. When the lock button (140) moves in the direction of arrow ①, the second knob body (130), the lock button (140), and the button holder (170) can move in the axial direction (arrow ② direction), except for the base part (110, not shown in FIG. 9) fixed to the control panel (30).

[0187] The knob assembly (100) that has moved in the axial direction in this way can be rotated in the direction of arrow ③. At this time, together with the second knob body (130), the first knob body (120, omitted in FIG. 9) and the lock button (140) are also rotated together. They can also be rotated in the opposite direction to arrow ③. Meanwhile, when the user removes the external force pressing the lock button (140), the lock button (140) can be moved in the direction of arrow ④ by the elastic member (S) and return to the knob lock position.

[0188] At this time, when the button holder (170) rotates in the direction of arrow ⑤, the button holder (170) can be positioned in the button restraint position. In the button restraint position, the button holder (170) interferes with the lock button (140), thereby restricting the lock button (140) from moving back to its original position, that is, in the direction toward the knob lock position (direction of arrow ④). This structure will be examined in more detail below.

[0189] FIGS. 10 to 16 sequentially illustrate the operation of the components constituting the present embodiment. First, looking at FIGS. 10 and FIGS. 11, the state in which the lock button (140) is in the knob lock position is illustrated. When the lock button (140) is in the knob lock position, the button operating part (143) is in a state where it protrudes outward from the operating hole (125). When the lock button (140) is in the knob lock position, the safety pin (150) is axially aligned with the stopper (115) of the base part (110), thereby restricting the axial movement of the safety pin (150). In FIG. 11, the first distance (H1) between the safety pin (150) and the stopper (115) is shorter than the distance required for the knob assembly (100) to press the drive shaft (71) and activate the operation of the cooking device. Drawing symbol L1 indicates the distance between the end of the protruding end (145) of the lock button (140) and the inner surface of the first knob body (120).

[0190] In this state, when the user presses the button operating part (143) in the direction of the arrow in FIG. 12, the lock button (140) can be inserted into the inside of the knob body (NB). At this time, the user must press the button operating part (143) while overcoming the elastic force of the elastic member (S). When this happens, the lock button (140) can move to the knob unlock position. In this way, the user can naturally press the lock button (140) that protrudes laterally while gripping the knob body (NB). Therefore, even if the lock button (140) is added, the operability of the knob assembly (100) is not reduced, and the user can easily operate the cooking device.

[0191] Referring to FIG. 13, the safety pin (150) is not axially aligned with the stopper (115) of the base part (110) and is positioned in a state of being axially misaligned with the stopper (115). Here, being misaligned means that the safety pin (150) and the stopper (115) do not have a position facing each other in the axial direction. In this way, the safety pin (150) can move axially without interference from the stopper (115). In FIG. 13, H2 represents the distance between the safety pin (150) and the base part (110), and G1 represents the distance between the center of the knob body (NB) and the base part (110). G1 is the distance at which the knob body (NB) can move axially. Drawing symbol L2 represents the distance between the end of the protruding end (145) of the lock button (140) and the inner surface of the first knob body (120), and it can be seen that it is reduced compared to the previous distance (L1, see FIG. 11).

[0192] The user can press the lock button (140), grasp the gripping part (123), and press the knob body (NB) axially. In FIG. 14, the arrow indicates the direction in which the knob body (NB) is pressed axially. When this happens, the knob body (NB), the lock button (140), and the weight plate (160) can move simultaneously toward the base part (110).

[0193] In this embodiment, the lock button (140) can be operated in a direction different from the axial movement of the knob body (NB). If the direction in which the lock button (140) is pressed and the direction in which the knob body (NB) is pressed are formed differently, the possibility of the user accidentally operating the knob assembly (100) is reduced.

[0194] More specifically, the button operating part (143) of the lock button (140) can move linearly in the axial direction (first direction, up and down direction in FIG. 13), which is the linear movement direction of the knob body (NB), and in the second direction (left and right direction in FIG. 13), which is different from the rotation direction of the knob body (NB). Accordingly, the possibility of the knob assembly (100) being operated arbitrarily due to user error or interference with objects around the cooking appliance can be further reduced.

[0195] Referring to FIG. 15, compared to FIG. 13, the knob body (NB), the lock button (140), and the weight plate (160) are shown moved closer to the control panel (30) and the base part (110). The safety pin (150) can move closer to the base part (110) by passing the top of the stopper (115). At the knob pressing position, the lock button (140) can be spaced apart from the base part (110) by a third distance (H3) in the axial direction. In FIG. 15, G2 represents the distance between the center of the knob body (NB) and the base part (110), and it can be seen that this distance is also reduced compared to the previous distance (G1, see FIG. 13).

[0196] When the knob body (NB), the lock button (140), and the weight plate (160) move in the axial direction in this manner, the second knob body (130), which fixes the drive shaft (71) through the shaft coupling part (131), moves the drive shaft (71) together in the axial direction. The drive shaft (71) that has moved in the axial direction can drive the heating drive unit of the cooking appliance. Here, the driving of the heating drive unit includes various operations such as turning the cooking appliance on / off and selecting the cooking mode of the cooking appliance.

[0197] When the drive shaft (71) moves by a reference distance in the axial direction, the drive shaft (71) can be rotated. In this embodiment, the heating drive unit is restricted to rotate only when the drive shaft (71) moves by a reference distance in the axial direction. FIG. 16 shows the knob body (NB) rotated clockwise, and the drive shaft (71) can also be rotated clockwise along with the knob body (NB). When the knob body (NB) is rotated in this way, the operating button (140) can be moved to a third position. At this time, when the drive shaft (71) is rotated together with the knob body (NB), functions such as controlling the heat of the cooking appliance, the number of heating devices (28) to operate, and selecting a cooking mode can be implemented.

[0198] Thus, in this embodiment, the operation of the lock button (140) precedes the subsequent operation of the knob body (NB). The axial movement and rotation of the knob body (NB) can only occur when the lock button (140) moves to the knob unlock position, and in the process, the drive shaft (71) dependent on the knob body (NB) can also be operated together.

[0199] Next, referring to FIGS. 17 to 22, we will examine the process in which the lock button (140) is restrained by the button holder (170). For reference, in FIGS. 17 to 22, the first knob body (120) and the weight plate (160) are omitted so that the button holder (170) is clearly visible.

[0200] The user can first separate the entire knob assembly (100) from the control panel (30). When the knob assembly (100) is pulled axially from the control panel (30), the knob assembly (100) and the drive shaft (71) are separated from each other, and the knob assembly (100) is removed from the control panel (30). This appearance is illustrated in FIG. 2.

[0201] Referring to FIGS. 17 and 18, the lock button (140) is in the knob lock position and the button holder (170) is in the button unlock position. The interference portion (175) of the button holder (170) is positioned below with respect to FIG. 18. That is, the interference portion (175) of the button holder (170) is not yet positioned in the movement path of the lock button (140). At this time, the position fixing portion (178) of the interference portion (175) can be held in a fixed state by being caught on the first relative fixing portion (138) of the second knob body (130). At the same time, as shown in FIG. 18, the end of the interference portion (175) can be caught on the rotation limiting portion (139) of the inner body (130), thereby limiting rotation. Reference numeral 133a shows the upper surface of the body plate (133).

[0202] In this state, the user can move the lock button (140) of the separated knob assembly (100) inward (in the direction of the arrow in FIG. 19) to the knob unlock position. At this time, the button body (141) moves inward toward the avoidance portion (133'). Referring to FIG. 20, one end of the lock button (140) contacts the surface of the second knob body (130), so that the lock button (140) can no longer move. However, if the user removes the external force pressing the lock button (140) in this state, the lock button (140) can be moved back to the knob lock position by the elastic member (S).

[0203] Referring to FIGS. 21 and 22, the lock button (140) moves in a direction toward the knob release position (left relative to the drawing), and an empty space is formed between the button body (141) of the lock button (140) and the first knob body (120). This empty space is the space occupied by the lock button (140) and can be considered part of the movement path of the lock button (140).

[0204] The user can rotate the button holder (170) while pressing the lock button (140). More precisely, the user can rotate the button holder (170) in the direction of the arrows in FIGS. 21 and FIGS. 22 while pressing the lock button (140). At this time, the user can hold and fix the first knob body (120) and rotate the holder handle (174) with the other hand.

[0205] In this way, the interference part (175) fills the empty space between the button body (141) of the lock button (140) and the first knob body (120). That is, the interference part (175) moves to the button restraint position. When it moves to the button restraint position, the button holder (170) interferes with the button body (141) of the lock button (140), thereby restraining the lock button (140) from moving to the knob lock position.

[0206] In this way, when the button holder (170) rotates with a rotation center concentric with the drive shaft (71) and moves to the knob lock position, the elastic member (S), the lock button (140), and the button holder (170) can be aligned in the radial direction of the knob body (NB).

[0207] Looking more closely, the user can rotate the button holder (170) while moving it forward (left direction based on FIG. 22) while overcoming the elastic force of the elastic member (S). When the position fixing part (178) of the interference part (175) reaches the position where the second relative fixing part (148) of the lock button (140) is formed, the second relative fixing part (148) is naturally fitted into the position fixing part (178), and the position of the button holder (170) can be fixed.

[0208] In this state, when the user removes the force pushing the button holder (170), the lock button (140) can be pressed against the surface of the button holder (170) by the elastic force of the elastic member (S). More precisely, the position fixing part (178) of the button holder (170) is pressed against the second relative fixing part (148) of the lock button (140). Accordingly, the button holder (170) can be maintained in a state moved to the button restraint position.

[0209] That is, when the button holder (170) is placed in the button restraint position, the interference portion (175) of the button holder (170) comes into contact with the button body (141) and supports the lock button (140). In this way, even if the elastic member (S) pushes the lock button (140) in the direction of the knob lock position (to the right direction based on FIG. 22), the lock button (140) does not move and can maintain the knob unlock position by the button holder (170).

[0210] In this state, when the user reconnects the knob assembly (100) to the drive shaft (71), the knob assembly (100) can be positioned in front of the base part (110). At this time, since the lock button (140) is in a pressed state, that is, moved to the knob release position and is constrained, the user does not need to press the lock button (140) to operate the cooking device. In other words, the operation of the lock button (140) (step 1) is omitted, and the knob assembly (100) can be operated in a push-and-turn manner. The user can activate the lock button (140) only when necessary by operating the button holder (170), thereby increasing the convenience of the knob assembly (100).

[0211] Meanwhile, unlike the above operation sequence, the user may rotate only the button holder (170) without pressing the lock button (140). Even if the user rotates only the button holder (170) without pressing the lock button (140), the interference part (175) can press the lock button (140) from the knob lock position to the knob unlock position when the button holder (170) rotates.

[0212] At this time, as previously explained, the length of the interference part (175) protruding in the opposite direction to the direction in which the button holder (170) rotates toward the button restraint position (counterclockwise in FIG. 22) is increased. Accordingly, when the button holder (170) is rotated, the force to overcome the elastic force of the elastic member (S) is distributed, so the user can move the lock button (140) together with the button holder (170) while rotating it without applying a large force.

[0213] FIG. 23 illustrates a second embodiment of a base part (110) constituting a knob assembly (100) according to the present invention. A description of the structure identical to the previously described embodiment will be omitted. Looking at the base part (110), the base part (110) is provided with two mounting pieces (110b) that are symmetrically arranged in the vertical direction. The two mounting pieces (110b) can be placed on each side with the base plate (110a) in between. Since the base part (110) has no vertical directionality, the operator does not need to align the base part (110) in a specific direction, thereby improving assembly. Additionally, depending on the position of the drive switch (70) or valve part (75) located at the rear of the control panel (30), the base part (110) can be fixed by attaching a mounting fastener (B1a, see FIG. 6) to either of the two mounting pieces (110b).

[0214] FIG. 24 illustrates a third embodiment of a base part (110) constituting a knob assembly (100) according to the present invention. A description of the structure identical to the previously described embodiment will be omitted. Looking at the base part (110), the base part (110) is approximately a rectangular plate. The base part (110) is provided with a contact protrusion (116), and a fastener assembly hole (113) into which a fastener is inserted may be formed in the contact protrusion (116). Since this base part (110) has no vertical orientation, the operator does not need to align the base part (110) in a specific direction, thereby improving assembly.

[0215] In this embodiment, a separate mounting piece (110b) is omitted. Accordingly, the base part (110) is not fixed to the drive unit frame (90) and can be mounted only to the front plate (31) by auxiliary fasteners (B1b, see FIG. 6).

[0216] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A base part positioned at the rear of the control panel and equipped with a stopper that passes through the control panel and protrudes forward; A knob body that rotates around a drive shaft protruding from the above-mentioned control panel and moves linearly in the axial direction of the drive shaft; and It includes a lock button having an operating part exposed to the outside of the knob body and moving along a direction different from the axial direction; The above lock button is a knob assembly having a knob lock position that interferes with the stopper in the axial direction to restrict the axial movement of the knob body, and a knob unlock position that moves from the knob lock position to allow the axial movement of the knob body.

2. In claim 1, the base portion is disposed on the rear surface of the control panel, and The above stopper is a knob assembly that passes through the above operating panel and protrudes forward along the axial direction.

3. In claim 1, a base through-hole is formed in the base portion, and The above drive shaft is a knob assembly that protrudes forward by passing through the base through hole and the panel through hole of the operating panel, respectively.

4. The knob assembly of claim 1, wherein the drive shaft and the stopper extend in a parallel direction.

5. In claim 1, a sealing member is disposed between the base portion and the control panel, and The stopper passes through the sealing member and extends forward of the control panel, The above sealing member is compressed between the base portion and the control panel, forming a knob assembly that seals between the base portion and the control panel.

6. In claim 5, the base portion is provided with a recessed portion that is recessed in a direction spaced apart from the rear surface of the control panel, and The sealing member is a knob assembly disposed in the recess.

7. A knob assembly according to claim 1, wherein the base portion is provided with a contact protrusion that contacts the rear surface of the operating panel.

8. In claim 7, the base portion has a base through-hole formed therein through which the drive shaft passes, and The above-mentioned contact protrusion protrudes in the axial direction from the base portion, and A knob assembly in which the plurality of contact protrusions are arranged around the base through hole in the base portion.

9. A knob assembly according to claim 7, wherein the contact protrusion has a fastener assembly hole formed therein that penetrates in the axial direction and into which a fastener is inserted.

10. In claim 8, the plurality of contact protrusions define a contact area on the base portion, and A base fastening hole is formed in the above base portion through which a fastening member passes, and The above base fastening hole is a knob assembly positioned at a location away from the contact area in the base portion.

11. In Claim 1, the base portion A base plate positioned facing the rear of the above-mentioned control panel and equipped with the above-mentioned stopper; and A mounting piece extending in a direction different from the axial direction from the base plate; comprising A knob assembly having a base fastening hole formed in the above-mentioned mounting piece through which a fastening hole passes.

12. In Claim 1, the base portion The stopper protruding in the axial direction from the first surface of the base portion; and A mounting arm protruding in the opposite direction to the stopper from the second surface of the base portion formed on the opposite side of the first surface; The above-mentioned mounting arm is a knob assembly coupled to a drive switch positioned at the rear of the above-mentioned control panel.

13. In claim 1, a base through-hole is formed at the center of the base portion through which the drive shaft passes, and In the base portion, the stopper is disposed at a position spaced apart from the base through hole in a first direction, and In the base portion, a base fastening hole is formed at a position spaced apart from the base through hole in a second direction different from the first direction, and The above base fastening hole is a knob assembly that is fastened to a fastener inserted through the above operating panel.

14. In claim 1, the lock button is provided with a safety pin that protrudes in the axial direction and interferes with the stopper, and At the above knob lock position, the safety pin is spaced radially from the drive shaft by a first distance, and At the above knob release position, the safety pin is radially spaced from the drive shaft by a second distance shorter than the first distance, and The stopper is a knob assembly spaced radially from the drive shaft by a distance greater than or equal to the second distance.

15. In claim 1, the knob body A first knob body that rotates around the above-mentioned drive shaft and has an operating space formed therein in which the above-mentioned operating part is operated; and It includes a second knob body coupled to the interior of the first knob body and coupled to the drive shaft; A weight plate is stacked in the axial direction on the second knob body above, and The above lock button is equipped with a safety pin protruding in the axial direction, and The above safety pin is a knob assembly that passes through the weight plate in the axial direction and interferes with the stopper.

16. Control Panel; A heating drive unit positioned at the rear of the above-mentioned control panel and equipped with a drive shaft; A base part disposed between the heating drive unit and the control panel, and equipped with a stopper protruding forward through the control panel; A knob body that rotates around the above-mentioned drive shaft and moves linearly in the axial direction of the above-mentioned drive shaft; and It includes a lock button having an operating part exposed to the outside of the knob body and moving along a direction different from the axial direction; A cooking appliance having the above lock button having a knob lock position that interferes with the stopper in the axial direction to restrict the axial movement of the knob body, and a knob unlock position that moves from the knob lock position to allow the axial movement of the knob body.

17. In claim 16, the base portion A base plate positioned to face the rear of the above-mentioned control panel; and A cooking appliance comprising: the stopper protruding from the base plate and extending forward of the control panel.

18. In claim 16, the heating drive unit includes a drive unit frame disposed at the rear of the control panel, and The above base portion is a cooking device that is fastened to the drive unit frame by means of a fastener assembled at the front of the control panel.

19. In claim 16, the heating drive unit includes a drive switch disposed at the rear of the control panel, and A cooking appliance having a mounting arm that is fixed by being caught on the drive switch in the base portion.

20. In claim 16, the operating panel has a panel through-hole opened, and A cooking device in which the above-mentioned drive shaft and the above-mentioned stopper each protrude forward through the panel penetration hole.

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