JP7386416B2 - Toaster oven - Google Patents

Description

The present application relates to a toaster oven, and particularly to a toaster oven with improved insulation between a heating chamber and the front of a door.

A toaster oven is equipped with a cooking grate on which objects to be cooked, such as bread, are placed in a heating chamber, and heaters placed above and below the cooking grate so as to extend in the left and right direction of the heating chamber. Heating and cooking the food. Because the oven is shaped like a cooking grid inside the heating chamber, compared to a pop-up toaster, you can place bread with ingredients on it, such as pizza toast, or bake mochi, pizza, gratin, etc. It is possible to add grill marks to the surface of the food to be cooked. In addition, it is possible to cook a variety of dishes other than toasting bread, such as placing a metal cooking plate with food on a cooking grid.

In such toaster ovens, a part of the door installed at the front of the heating chamber to take food in and out of the heating chamber is made of glass, so that it is possible to check the doneness of the food inside the heating chamber. . On the other hand, the side walls, rear wall, top surface, and other wall surfaces that make up the heating chamber are galvanized with galvalume steel plates (registered trademark), etc. so that the radiant heat from the heater can be reflected and distributed throughout the heating chamber. Steel plates are used. In contrast to each of these walls, the front of the heating chamber is a door with glass that easily transmits radiant heat, which prevents the temperature of the food placed in the front part of the cooking grate from rising. There was a problem that unevenness occurred.

In such a toaster oven having a glass window in the front door, a plurality of plate-shaped shielding plates are arranged on the inner side of the glass window of the door so that the rear side of the main surface of the shielding plates is inclined so that the rear side thereof is downward, and A configuration in which the devices are arranged at little intervals has been proposed (see Patent Document 1).

Japanese Patent Application Publication No. 2000-51094

In the above-mentioned conventional toaster oven, a shielding plate whose main surface is formed diagonally downward is placed on the inner surface of the transparent window of the door, so that the radiant heat from the heater placed above the heating chamber is transferred to the inside of the heating chamber. This can reduce uneven cooking at the front end of the cooking grate. Furthermore, by arranging a plurality of shielding plates in parallel at predetermined intervals, the user can check the degree of grilling of the food to be cooked in the heating chamber from between the shielding plates whose main surfaces are inclined diagonally downward.

However, the conventional toaster oven described above requires a mechanism to attach a shielding plate to the back side of the glass window, making the door structure complicated. The range in which you can check the situation is also limited.

The present disclosure solves the problems with conventional toaster ovens, and although it has a simple configuration, it is possible to easily check the inside of the heating chamber through the window, and also to check the temperature inside the heating chamber through the glass part of the door. To provide a toaster oven which can effectively prevent the gas from escaping to the outside.

In order to solve the above problems, the toaster oven of the present disclosure includes a heating chamber, a door that can be opened and closed to cover the front surface of the heating chamber, a cooking grid on which a food to be cooked placed in the heating chamber is placed; The door includes at least one of an upper heater placed above the cooking grate in the heating chamber and a lower heater placed below the cooking grate in the heating chamber, and the door is placed on the front side. a first glass disposed on the heating chamber side and a second glass disposed on the heating chamber side, and a space inside the door formed between the first glass and the second glass is outside. It is characterized by being connected to

In the toaster oven of the present disclosure, the door covering the front of the heating chamber has a double glass structure including two glasses, a first glass and a second glass, and the space inside the door is connected to the outside. . Therefore, it is difficult for the heat and moisture in the heating chamber to escape, and it is also possible to effectively suppress the transmission of heat to the front of the door through the glass.

FIG. 1 is a perspective view showing the appearance of a toaster oven according to the present embodiment. FIG. 2 is a perspective view showing the toaster oven according to the present embodiment with the door open. FIG. 2 is a cross-sectional view of the heating chamber cut in the front-rear direction, illustrating the internal configuration of the toaster oven according to the present embodiment. It is an image diagram explaining the structure of the door of the oven toaster concerning this embodiment. FIG. 2 is an enlarged sectional view of a main part of the toaster oven door according to the present embodiment. FIG. 2 is an exploded perspective view illustrating the structure of the door of the toaster oven according to the present embodiment. It is a figure which shows the temperature change in a heating chamber in the toaster oven of this embodiment and the toaster oven of a comparative example. It is a figure which shows the state of the top surface of toast in the oven toaster of this embodiment and the oven toaster of a comparative example. It is a figure which shows the state of the bottom surface of toast in the toaster oven of this embodiment and the toaster oven of a comparative example. It is a figure which shows the state of the surface of quiche-style toast in the toaster oven of this embodiment and the toaster oven of a comparative example. It is a figure which shows the temperature change inside the cheese of quiche-style toast in the oven toaster of this embodiment and the oven toaster of a comparative example. It is a figure which shows the moisture attenuation rate of the bread before and after toasting in the oven toaster of this embodiment and the oven toaster of a comparative example. It is a figure which compares the state of heat transmission to the cup placed in front of the door in the toaster oven of this embodiment and the toaster oven of a comparative example.

The toaster oven of the present disclosure includes a heating chamber, an openable/closable door that covers the front surface of the heating chamber, a cooking net on which a food to be cooked is placed, and a cooking net in the heating chamber. The door includes at least one of an upper heater arranged above and a lower heater arranged below the cooking grate in the heating chamber, and the door includes a first heater arranged on the front side. glass and a second glass disposed on the side of the heating chamber, and a space inside the door formed between the first glass and the second glass is connected to the outside.

By having the above configuration, the toaster oven of the present disclosure can effectively prevent heat and moisture from escaping from the heating chamber with the double glass door. In addition, the heat insulation effect of the air in the space inside the door can effectively suppress the conduction of heat to the outer glass surface in front of the door or to a cup placed in front of the door.

In the toaster oven according to the present disclosure, it is preferable that the second glass has a smaller area than the first glass, and that the lower end of the second glass is located above the cooking grate. By doing so, heat escape from the heating chamber can be suppressed, and heat from the lower heater can be reflected toward the cooking grid, thereby reducing temperature unevenness within the heating chamber.

Moreover, it is preferable that the second glass is disposed at a position protruding toward the heating chamber from a surface of the door on the heating chamber side. By doing so, it is possible to increase the space inside the door and improve the heat insulation effect, and it is also possible to restrict the route through which heat and moisture escape from the heating chamber.

In this case, it is preferable that the surface of the door on the side of the heating chamber has a curved surface that curves from a peripheral portion to a position where the second glass protrudes toward the heating chamber. By doing so, the surface area facing the inner surface of the door becomes larger, and the heat insulating effect of the door can be further enhanced.

Furthermore, the amount of protrusion of the second glass toward the inside of the heating chamber is such that when the door is closed, the second glass is close to the front end portion of the cooking plate placed on the cooking grate. It is preferable that it is set to . By doing so, the thickness of the door can be increased without changing the internal configuration of the heating chamber, and the heat insulation effect of the door can be further improved.

(Embodiment)
Hereinafter, the toaster oven disclosed in this application will be described using specific embodiments.

FIG. 1 is a perspective view showing the appearance of a toaster oven according to this embodiment.

As shown in FIG. 1, the toaster oven 100 of this embodiment includes a casing 10 that constitutes the outer shell of the toaster oven 100 and has a heating chamber 50 (see FIG. 2) inside, and a casing 10 disposed on the front side of the casing 10. The device includes a door 20 that can be opened and closed to cover the front surface of a heating chamber 50 formed in the housing 10, and an operating section 30 disposed below the door 20 on the front surface of the housing 10.

In addition, hereinafter, in this specification, the front and rear, left and right, and top and bottom directions of the toaster oven are referred to based on the direction seen from the user who is placing the toaster oven on a table or other mounting stand and facing the door in normal use. The directions will be determined, and the arrangement of each member constituting the toaster oven will be explained using these directions as appropriate. Specifically, in the perspective view shown in FIG. 1, the front left side of the figure is the front of the toaster oven, and the back right side of the figure is the rear of the toaster oven. Further, the left-right direction in FIG. 1 is the left-right direction of the toaster oven, and the up-down direction in FIG. 1 is the up-down direction of the toaster oven. Furthermore, in the description of the door, the front side of the door, that is, the surface facing the user, may be referred to as the front surface of the door, and the rear side of the door, that is, the surface facing the heating chamber, may be referred to as the back surface of the door.

In the toaster oven 100 of this embodiment, a tray 11 (see FIG. 3) is arranged below the housing 10 to catch crumbs of bread spilled inside the heating chamber. The tray 11 can be removed by pulling it out toward the front. Furthermore, leg portions 12 are formed on the lower surface of the casing 10 when the toaster oven 100 is placed on a mounting base such as a table.

In the toaster oven 100 of this embodiment, the door 20 can be opened by tilting the handle 21 disposed at the upper end portion of the front surface toward the lower side (see arrow A in FIG. 2).

Both left and right end portions below the door 20 are connecting portions 22 that extend downward, and a hinge mechanism 23 (Fig. 3 ) is provided. In addition, the central part of the door 20 sandwiched between the pair of connecting parts 22 is cut out, and as shown in FIG. The operation unit 30 is exposed so that the user can easily operate it.

In the toaster oven 100 according to the present embodiment, in consideration of design, almost the entire front surface of the door 20 excluding the connecting portion 22 is made of an outer glass 26 as a first glass made of transparent plate glass. ing.

An opening passing through the door 20 is formed in the central portion of the door 20 excluding the peripheral portion. Further, as shown in FIGS. 2 and 3, an inner glass 27 as a second glass, which is a transparent plate-like member, is also arranged on the heating chamber side of the opening formed in the door 20. With this configuration, the user can access the food to be cooked inside the heating chamber 50 even when the door 20 is closed, through the outer glass 26 and opening on the front side of the door 20 and the inner glass 27 on the back side. It is possible to understand the status of Note that the configuration of the door 20 will be described in detail later using FIG. 4 and subsequent figures.

The operation unit 30 includes a plurality of operation dials 31 for setting and adjusting heating time and heating temperature, various operation buttons (not shown), and the like. In the example shown in FIG. 1, two operation dials 31 are arranged on the operation unit 30, but the number and location of the operation dials 31, operation buttons, etc. are as shown in FIG. It is not limited to what is shown, but the necessary items should be arranged in accordance with the cooking menu that can be prepared by the toaster oven 100, taking into account the necessary number and design. Furthermore, a display panel using a liquid crystal panel or the like for displaying the setting status of the cooking menu and various operating states of the toaster oven 100, and various notification lamps such as LED lamps may be arranged on the operation unit 30. Can be done.

In the configuration of the toaster oven 100 shown in FIG. 1, a hinge mechanism 23 is provided at the tip of the connecting portion 22 at both left and right ends below the door 20, and the door 20 is shown to open so as to fall down toward the front. However, the opening/closing direction of the door of the toaster oven 100 according to the present embodiment is not limited to this. A hinge mechanism is formed at the right end or left end of the door, and the door can be rotated to the right or left. A configuration that allows opening and closing can be adopted.

In addition, although the toaster oven 100 of the present embodiment is configured such that the operating section 30 is provided at the lower front of the housing 10 so that the operating section 30 is exposed at the front when the door 20 is closed, the operating section 30 is The arrangement location of 30 is not limited to the example shown. For example, the door can be shaped to cover the entire front side of the heating chamber, and the operating section can be placed at the lower part of the window formed in the door, or at any peripheral part including the left, right, and upper sides. . In addition, the lateral center of the heating chamber is eccentrically arranged in either the left or right direction with respect to the lateral center of the casing, and the casing and heating chamber that are caused by shifting the position of the heating chamber in the lateral direction The operating section may be arranged in front of the gap portion. Furthermore, regardless of the location of the operating section, some of the operation buttons arranged on the operating section may be arranged on a portion other than the front side of the toaster oven, such as the top surface or side surface of the casing.

FIG. 2 is a perspective view showing the toaster oven according to the present embodiment with the door open.

In the toaster oven 100 of this embodiment, the tip portion of the connecting portion 22 formed at both left and right ends of the lower side of the door 20 and the lower end portions of both left and right ends of the front surface of the casing 10 are connected by a hinge mechanism 23. When the user pulls the handle 21 downward toward the front, the door 20 is rotated and opened in the direction shown by arrow A in FIG.

The toaster oven 100 of this embodiment is configured such that the user can pull out the cooking net 41 disposed inside the heating chamber 50 with the door 20 open. Further, a cooking plate 42 used when cooking food in a dish-shaped container such as gratin can be placed on the cooking grid 41.

In addition, a hook member that can be connected to the tip of the cooking net 41 is arranged on the back of the door 20 so that the cooking net 41 can be pulled out at the same time as the door 20 is opened. It is also possible to easily place a loaf of bread or a cooking plate 42 on top of the cooking plate 41.

In the toaster oven 100 according to the present embodiment, a support part 24 that supports the door 20 when the door 20 is opened/closed is formed on the back surface of each of the pair of left and right connecting parts 22 of the door 20, and an end of the support part 24 is provided with a support part 24 that supports the door 20 when the door 20 is opened or closed. When the housing 10 is closed, the end portion (the end portion on the door 20 side) of the movable portion 25 housed within the housing 10 is rotatably connected. The movable part 25 is arranged so as to be slidable in the front and rear directions between the side wall of the heating chamber 50 and the side wall of the housing 10, so that the door 20 can be opened and closed smoothly. In this way, in the toaster oven 100 according to the present embodiment, the support part 24 and the movable part 25 constitute the opening/closing mechanism of the door 20, but the opening/closing mechanism of the door 20 is limited to the shape shown in FIG. Instead, it is possible to adopt various shapes that allow the door 20 to rotate smoothly around the hinge mechanism 23 to open the front surface of the heating chamber 50.

The cooking net 41 can be of various types, such as one in which a frame serving as a skeleton part and a mesh part on which the food to be cooked is placed are integrally formed, or one in which the mesh part is configured to be detachable from the skeleton part. form can be adopted. Further, the cooking plate 42 is made of an aluminized steel plate or the like, and is a substantially rectangular dish with relatively low side walls.

FIG. 3 is a sectional view showing the internal configuration of the toaster oven of this embodiment. FIG. 3 shows a cross section of the toaster oven according to the present embodiment at a central position in the left-right direction, viewed from the right side.

As shown in FIG. 3, when the door 20 is closed, the cooking grid 41 is located within the heating chamber 50 over almost the entire length in the front-rear direction.

In the toaster oven 100 according to the present embodiment, the upper heater 51 is arranged above the central portion in the front-rear direction of the cooking grate 41 housed inside the heating chamber 50 . Further, below the cooking grid 41 of the heating chamber 50, a first lower heater 52 located on the front side of the heating chamber 50 and a second lower heater 53 located on the rear side of the heating chamber 50 are provided. It has a configuration with two lower heaters.

As the upper heater 51 used in the toaster oven, for example, a quartz tube heater with an outer diameter of 12 mm, a length of 315 mm, and a rating of 610 W can be used. Further, as the first lower heater 52 and the second lower heater 53, for example, a quartz tube heater having an outer diameter of 12 mm, a length of 315 mm, and a rating of 345 W can be used. In addition, as the heater used in the toaster oven of this embodiment, various heaters such as a sheathed heater of about 600 W to 700 W can be used in addition to the above.

In the toaster oven of this embodiment, the three heaters 51, 52, and 53 are arranged in the heating chamber 50 so as to extend in the left-right direction of the toaster oven. Here, the three heaters 51, 52, and 53 are arranged so that both ends of each heater are approximately equal in front and back positions and up and down positions in the heating chamber 50 of the toaster oven, that is, to avoid manufacturing errors, etc. It is placed in such a way that it remains exactly horizontal, and faces exactly left and right. In addition, in order to heat the food placed on the cooking grid 41 as uniformly as possible, the three heaters 51, 52, and 53 that appear in the cross-sectional view of FIG. The net 41 is arranged so that the center portion in the front-rear direction is located.

The heating chamber 50 has a top wall 54 forming the top surface, a back wall 55 opposing the door 20 and forming the back surface, a bottom surface 56 opposing the top wall 54 forming the bottom surface, the top wall 54, the back wall 55, It is surrounded by a pair of mutually opposing side walls 57 (left side 57a, right side 57b) which form left and right side surfaces continuous with the bottom surface 56. Note that in FIG. 3, only the left side wall 57a of the heating chamber 50 is visible. Further, the upper side of the opening on the front side of the heating chamber 50 is covered with the back side of the door 20.

In the toaster oven of this embodiment, the top wall 54 and the bottom surface 56 are arranged horizontally, and the side wall 57 is arranged vertically, and both are substantially flat surfaces. On the other hand, the back wall 55 has an intermediate portion 55a near the rear end of the cooking net, an upper portion 55b located above the intermediate portion 55a with its main surface facing diagonally downward, and a lower portion than the intermediate portion 55a. It is composed of three parts, including a lower part 55c located below and with its main surface facing diagonally upward.

In this way, by forming the upper portion 55b of the rear wall 55 as an inclined surface with the main surface facing downward, the radiant heat from the upper heater 51 can be reflected toward the food to be cooked on the cooking grate 41. . In addition, by forming the lower portion 55c of the rear wall 55 as an inclined surface with the main surface facing upward, the radiant heat from the second lower heater 53 disposed on the rear side can be transferred to the cooked food on the cooking grate 41. It can be reflected towards objects. As a result, the food to be cooked can be heated more evenly, the cooking time can be shortened, and, for example, when baking multiple pieces of toast, uneven cooking can occur depending on the placement location on the cooking grid 41. can be effectively reduced.

Note that, as shown in FIG. 3, by forming a part of the rear wall 55, especially the upper wall 54 side, into the inclined surface 55b, the height of the back side (back side) in the space inside the heating chamber 50 is reduced. , the height of the food placed directly on the cooking grid 41 or via the cooking plate 42 is limited. Therefore, the setting of the height of the vertical portion 55a of the back wall 55, the inclination angle of the upper portion 55b and the lower portion 55c, etc. are appropriately set in consideration of the size required for the heating chamber 50 as a cooking space. Should. Furthermore, instead of having the configuration in which the toaster oven 100 has the inclined surfaces 55b and 55c on the upper and lower sides, the rear wall 55 is formed as a substantially vertical surface, so that the capacity inside the heating chamber 50 is sufficiently increased. It is also possible to design a design that prioritizes ensuring that

In the toaster oven 100 according to the present embodiment, as shown in FIG. 3, a top protrusion 58 having a substantially triangular cross section is provided near the front end of the top wall 54 on the front side of the portion where the upper heater 51 is disposed. It is formed with two vertices facing downward and extending in the left-right direction. The upper surface protrusion 58 has the purpose of preventing the upper heater 51 from being seen through the front door 20, so the upper surface protrusion 58 is formed on the upper wall 54 with a height sufficient to cover the upper heater 51 when viewed from the front side. It is formed to protrude downward from the surface. Furthermore, by providing an upper protrusion 58 with an inclined surface facing the upper heater 51 in front of the upper heater 51, the radiant heat radiated forward from the upper heater 51 is reflected and placed on the cooking grate 41. It can be directed toward the side of the food being placed.

Furthermore, in the toaster oven of this embodiment, in the heating chamber 50 in front of the first lower heater 52, there is an operation section isolation section that separates the operation section 30 arranged on the lower side of the housing 10 from the heating chamber 50. A plate 59 is arranged. In the toaster oven of this embodiment, a circuit board 32 is equipped with a switch circuit connected to the operation dial 31 of the operation unit 30, a control circuit for controlling the entire toaster oven such as on/off control of the heater, etc. is arranged in a circuit board arrangement area on the back side of the operation section 30. The operation part isolation plate 59 allows the heat in the heating chamber 50, particularly the heat from the first lower heater 52 located at the closest position, to be transferred to a timer or the like on the circuit board 32 arranged in the circuit board arrangement area. It is preferable to use a material with high heat reflection properties so as to avoid adverse effects on electronic components and the like.

Further, in the toaster oven of this embodiment, a curved reflection plate 28 is arranged on the lower rear side of the door 20. As shown in FIG. 3, the reflector 28 reflects the radiant heat from the first lower heater 52 toward the food placed on the cooking grate 41 during cooking when the door 20 is closed. , functions so that sufficient radiant heat is radiated to the back surface (surface disposed on the lower side) of the food to be cooked in a portion close to the door 20. Further, although not shown, when the door 20 is opened, the reflection plate 28 is pulled forward as the door 20 rotates, and reaches a position covering the upper and front sides of the operating section 30. In this way, when the door 20 is open, the reflective plate 28 functions as a cover member that prevents the food placed on the cooking grate 41 from spilling and contaminating the operating section 30. Can be done.

Note that the configuration of each wall surface portion (54 to 57) forming the outer shell of the heating chamber 50 described using FIG. 3 is merely an example. For example, it is not an essential requirement to form the upper surface protrusion 58 having a substantially triangular prism cross section on the front side of the upper wall 54. Further, an inclined surface is further formed between the rear side portion of the upper surface wall 54 and the portion connected to the upper portion 55b of the rear wall 55, and a plurality of slopes of two or more steps are formed from the upper surface wall 54 to the rear wall 55. It can be configured such that a surface is formed. Furthermore, the rear portion of the upper wall 54 can be formed with a curved surface that is convex toward the rear and upper side. Furthermore, instead of forming the substantially triangular prism-shaped upper surface protrusion 58 on the front side of the upper wall 54, it is possible to arrange an inclined surface toward the front side similar to that on the rear side. Furthermore, the operating section separating plate 59 and the reflecting plate 28 described in the above embodiments are not necessarily essential components, and may be appropriately arranged as necessary.

In the toaster oven 100 of this embodiment, the top wall 54, the back wall 55, the bottom wall 56, and the side walls 57 that form the periphery of the heating chamber 50 are made of galvalume steel plates having high heat reflection characteristics. The food to be cooked can be efficiently heated by the heat of the heater 51 and the lower heaters 52 and 53. In addition to the galvalume steel sheet, the materials constituting each wall surface of the heating chamber 50 include various steel sheets with high heat reflection properties, such as aluminum-plated Ulster steel sheet and galvanized steel sheet, which is a highly rigid steel sheet. can be used. Furthermore, the same material as the wall surface portion, such as a galvalume steel plate, can be suitably used for the operation section partition plate 59 that reduces the transfer of heat to the circuit board arrangement area.

A tray 11 having a flat surface large enough to cover the opening formed in the bottom surface 56 is arranged below the bottom surface 56 . By placing a finger on the handle portion 11a located at the bottom of the door 20 on the front side of the tray 11, the user can pull out the tray 11 to the front side and then pull it out. and water can be easily disposed of.

Next, the structure of the door disposed to cover the front side of the heating chamber in the toaster oven according to the present embodiment will be described in more detail.

FIG. 4 is an image diagram illustrating the structure of the door of the toaster oven according to this embodiment. FIG. 4 is a diagram illustrating a cross section at an intermediate portion in the left-right direction of the toaster oven according to the present embodiment as viewed diagonally from the right front, and is an enlarged image diagram of the main part showing the door portion enlarged.

FIG. 5 is a sectional view illustrating the structure of the door of the toaster oven according to this embodiment. FIG. 5 is an enlarged view of a main part centered on the door portion, with respect to a cross section taken at an intermediate position in the left-right direction of the door.

FIG. 6 is an exploded perspective view showing the shape and positional relationship of the main members constituting the door of the toaster oven according to the present embodiment.

In addition, in the following description of the door 20, as shown in FIGS. 1 and 3, the vertical direction of the door 20 is based on the closed state where the door 20 covers the front of the heating chamber 50. The explanation will be made assuming that it corresponds to the vertical direction of 100.

As shown in FIGS. 4, 5, and 6, the door 20 of the toaster oven 100 according to the present embodiment is formed into a substantially plate shape having a predetermined thickness as a whole, and the entire outer shell of the door 20 is , an upper cover 20b that is placed above the door 20 and covers the upper front and left and right sides of the door 20, and the upper surface of the door 20, and an upper cover 20b that is placed below the door 20 and covers the top of the door 20, and Between a lower plate 20c which forms the lower surface of 20 and supports the outer glass 26 and whose front portion is folded back to hold the outer glass 26 from the front, the main plate 20a, the upper cover 20b, and the lower plate 20c, the outer glass is 26 and a glass holder 20d that holds the inner glass 27. In addition, in FIG. 4, the main plate 20a, upper cover 20b, lower plate 20c, and glass retainer 20d that make up the door 20 are shown colored with different densities to make it easier to understand the shape of each member.

In the toaster oven 100 according to this embodiment, tempered glass with a length of 123 mm, a width of 373 mm, and a thickness of 3 mm is used as the outer glass 26. As described above, in the toaster oven of this embodiment, the outer glass 26 occupies most of the front surface of the door 20, thereby improving the overall design of the toaster oven. Further, as the inner glass 27, a transparent glass having an area smaller than the outer glass and having a length of 73 mm, a width of 297 mm, and a thickness of 3 mm is used. The size and material of the outer glass 26 and the inner glass 27 are merely examples, and are subject to considerations such as the design of the door 20, light transmittance that allows good visibility of the state of the food to be cooked inside the heating chamber 50, and heat resistance. Needless to say, it can be selected as appropriate.

The main plate 20a includes a frame-shaped part that has an opening in the center and covers the front of the heating chamber, and a pair of connecting parts 22 that are continuously formed at both left and right ends of the lower end of this frame-shaped part and extend downward. It is a plate-shaped member that forms the back surface of the door 20. In addition, in the toaster oven 100 according to the present embodiment, since the inner glass 27 is disposed at a position where it enters the heating chamber 50, the peripheral portion 20a1 of the opening of the main plate 20a is formed to protrude toward the back side. . Further, the main plate 20a has a pair of bent portions 20a2 that are bent forward from both left and right ends of the plate, and these bent portions 20a2 constitute both left and right side surfaces of the door 20.

A pair of left and right connecting portion covers 22a forming the front surface of the connecting portion 22 are attached to the connecting portion 22 portion of the main plate 20a (see FIG. 6).

The upper cover 20b is arranged at the upper part of the door 20 when it is closed, and has a front part 20b1 that constitutes the upper part of the front surface of the door 20, and a front part 20b1 that is folded back from the upper end of this front part to constitute the upper surface of the door 20. It has an upper folded part 20b2 and a side folded part 20b3 which is folded back from both left and right ends of the front part to form upper ends of both left and right sides of the door 20. In the toaster oven 100 of this embodiment, the upper cover 20b is placed in a place where it can be easily seen by the user, so it is colored in a conspicuous color such as white to have a design effect that improves the appearance. , plays the role of holding the upper end of the outer glass 26 disposed on the front surface of the door 20 from the front. Further, the upper cover 20b is a member that is placed at a location above the door 20 where the handle 21 is attached, and is bent at approximately 90 degrees so as to cover the front and upper surfaces of the door 20. It also acts as a reinforcing member that increases the strength of the material.

The lower plate 20c covers the bottom of the door 20 other than the connecting portion 22, and includes a bottom portion 20c1 that extends to the front side of the door 20 and supports the bottom of the outer glass 26, and a bottom portion 20c1 that is folded upward from the front end of the bottom portion 20c1. It is composed of a front surface holding part 20c2 that holds the front surface of the outer glass 26, and a back surface folded part 20c3 that is folded back upward from the rear end of the bottom surface part 20c1 and forms the lower back surface side of the door 20. As shown in FIGS. 4 and 5, the upper end portion of the front holding portion 20c1 is further folded back, so that the outer glass 26 can be held more reliably between it and a glass holder 20d, which will be described later. It is now possible to do so.

The glass retainer 20d is formed to protrude toward the back side of the main plate 20a and a first plane 20d1 that holds the outer glass 26 between the back side of the front part of the upper cover 20b and the front side holding part of the lower plate 20c. and a second plane 20d2 that holds the inner glass 27 between it and the front surface near the opening. In the toaster oven 100 according to the present embodiment, the door 20 includes an outer glass 26 and an inner glass 27 on the heating chamber side, and a cavity 60 is formed between the two glasses. Therefore, the first plane 20d1 of the glass holder 20d that contacts the back side of the outer glass 26, that is, the front surface of the glass holder 20d when the door 20 is closed, and the second plane that contacts the front side of the inner glass 27. The plane 20d2, that is, the back surface of the glass holder 20d, forms two surfaces arranged substantially parallel to each other with a predetermined interval.

Further, as described above, since the inner glass 27 has a smaller area than the outer glass 26, the second plane 20d2 of the glass holder 20d is formed smaller than the first plane 20d1. The glass retainer 20d of the toaster oven 100 according to the present embodiment connects the second plane 20d2 and the first plane 20d1 with a continuous inclined surface 20d3, so that when the user looks at the door 20 from the front, the door 20 The interior glass 27, which is located at a position set back from the front of the heating chamber 50 and has a small area, can be seen without discomfort, and the design allows the entire door 20 to be recognized as a window through which the interior of the heating chamber 50 can be viewed. .

In addition, in the toaster oven 100 according to the present embodiment, a plurality of substantially truncated pyramid-shaped projections 20d4 whose tips are formed as flat surfaces having a smaller area than the base are formed on the surface of the first plane 20d1 of the glass retainer 20d. Since the small-area flat surface at the tip of the protrusion 20d4 comes into contact with the back side of the outer glass 26, there is a gap between the back surface of the outer glass 26 and the first flat surface 20d1 of the glass retainer 20d. A predetermined gap is formed. Since it is preferable that the protrusions 20d4 contact the back surface of the outer glass 26 so as to apply force evenly, they are arranged at predetermined intervals on each side of the first plane 20d1 of the rectangular frame-shaped glass holder 20d. ing. In the example shown in FIG. 6, on the top and bottom long sides of the first plane 20d1 configured in the shape of a rectangular frame, there are three pieces located slightly closer to the center, and on the left and right short sides, there are three pieces at the top and bottom ends. Two protrusions 20d4 are arranged near a certain corner, for a total of ten protrusions 20d4.

In addition, in the toaster oven 100 according to the present embodiment, the second plane 20d2 of the glass retainer 20d does not have the protrusion 20d4 like the first plane 20d1, but the protrusion 20d4 on the back side of the second plane 20d2. The whole is configured so as to come into contact with the front side of the inner glass.

In the toaster oven 100 according to the present embodiment, the interval between the main plate 20a and the inner glass 27 forming the back surface of the door 20 and the upper cover 20b, lower plate 20c and outer glass 26 forming the front surface of the door 20 is , is configured as a hollow space 60 in which no other members exist except for the constituent members of the door 20, such as the glass presser 20d for holding the two glasses and the boss 29 for fixing the handle 21. The hollow space 60 inside the door 20 is formed by a slit 61 formed on the side surface of the door 20 shown in FIGS. 1 and 2, and a hole formed in the bottom part of the lower plate 20c (not shown). , and is connected to the outside space, that is, the space around the toaster oven 100.

In addition, in the toaster oven disclosed in this application, the inner glass 27, which is the second glass, is arranged on the back side of the door 20, so that the position of the back side of the door 20 that blocks the opening of the heating chamber 50 in front of the heating chamber 50 is However, the position is extremely close to the heating chamber 50. In particular, the door 20 of the toaster oven 100 of this embodiment whose detailed configuration is shown in FIGS. 4 and 5 is configured such that the inner glass 27 protrudes from the back surface of the door 20 and enters the front portion of the heating chamber 50. The back surface of the door 20 is configured as a curved surface connecting this protruding portion and the peripheral portion.

The amount of protrusion (retraction amount) of the inner glass 27 in the toaster oven according to this embodiment, shown as width B in FIG. 5, is set to 7.3 mm as an example. In this way, by making the inner glass 27 protrude rearward and entering the heating chamber 50 with the door 20 closed, the space 60 inside the door 20 can be reduced without increasing the thickness of the door 20. The volume of can be expanded. Therefore, the heat insulation effect of the air existing in the space inside the door 20 is improved.

Note that the amount of rearward protrusion of the inner glass 27 is such that, if the configuration inside the heating chamber 50 is not changed, it does not come into contact with the front end of the cooking grate 41, which is the most forwardly located member inside the heating chamber 50. is the limit. However, considering that the cooking net 41 is pulled forward as appropriate during use, it is necessary to ensure a certain degree of margin. Moreover, when the amount of rearward protrusion of the inner glass increases, at least the main plate 20a and the glass retainer 20d among the members constituting the door 20 become larger, leading to an increase in the weight of the door 20. If the weight of the door 20 increases, when the user leaves the door 20 ajar during use, the door 20 may fall open due to its own weight. If the door 20 opens when the user is not expecting it, the door 20 may come into contact with tableware such as a cup placed in front of the toaster oven, or the door 20 may come into contact with the user's hand if the temperature of the door 20 is high. There is a possibility that such unforeseen situations may occur. For this reason, it is preferable to keep the door 20 within a range where it will not open under its own weight. From these viewpoints, in this embodiment, the amount of rearward protrusion of the inner glass 27 is set to 7.3 mm as described above. At this time, the distance between the front surface of the outer glass 26 and the back surface of the inner glass 27 is 23 mm. Further, based on the fact that three gratin dishes can be placed on the cooking plate 42, the gap (tolerance) between the front end portion of the cooking net 41 and the width C shown in FIG. 5 is set to 5 mm.

Further, as shown in FIG. 5, in the toaster oven of this embodiment, the lower end of the inner glass 27 is located above the cooking grate 41. By doing this, the lower part of the inner glass 27 is constituted by the metal main plate 20a, so that the lower part of the inner glass 27 is composed of the metal main plate 20a. The radiant heat can be reflected in the direction of the food placed on the cooking net 41, and the heat can be effectively transmitted to the food placed in front of the placement net 41. At the same time, by reducing the area of the inner glass 27, the transfer of radiant heat from the heaters 51 to 53 in the heating chamber to the space 60 inside the door 20 is reduced, and the space 60 inside the door 20 and furthermore, the outer glass 26 temperature rise can be suppressed.

Hereinafter, the effects of the toaster oven 100 according to this embodiment will be explained.

FIG. 7 is a diagram showing changes in the temperature in the heating chamber of the toaster oven.

In FIG. 7, a solid line indicated by reference numeral 71 represents a change in the temperature inside the heating chamber 50 in the toaster oven having a double structure of glass including an outer glass 26 and an inner glass 27 according to the present embodiment. Moreover, the dotted line 72 in FIG. 6 indicates the heating chamber of a toaster oven as a comparative example in which the volume in the heating chamber 50 and the output of the heater are the same, but only one glass is placed in the door. Shows changes in temperature. In either case, the temperature at a position approximately 30 mm above the central portion of the cooking net 41 was measured with only the cooking net 41 placed in the heating chamber 50 without placing the food to be cooked or the cooking plate 42. are doing.

As shown in FIG. 7, the toaster oven (71) with the double glass structure of the present embodiment has a higher temperature than the toaster oven (72) with the single glass structure of the comparative example after 10-odd seconds have elapsed immediately after the start of heating. It can be seen that the temperature inside the heating chamber is increasing while maintaining the temperature.

As described above, in the toaster oven according to the present embodiment, the temperature inside the heating chamber was higher than that of the toaster oven with the single glass structure of the comparative example. The front end of the heating chamber 50 is approached, and the inner glass 27 located at the center of the door 20 is placed inside the heating chamber 50, and the surface curves from the periphery to the center where the inner glass 27 is arranged. With this structure, the gap between the heating chamber 50 and the door 20 is effectively closed, and the path for the warm air inside the heating chamber 50 to escape to the outside is lengthened, thereby reducing the temperature inside the heating chamber 50. This is thought to be due to the fact that it was able to maintain a high level.

Next, when four pieces of bread were placed on the cooking grid 41 and toasted, variations in the browning color were checked.

FIG. 8 shows the browning color of the top surface when four pieces of bread are toasted in a toaster oven. Similarly, FIG. 9 shows the browning color of the bottom surface, that is, the cooking grid side, when four pieces of bread are toasted.

In each figure, (a) shows the browning color in a toaster oven having a door with a double glass structure according to the present embodiment, and (b) shows the browning color in a toaster oven with a door in a single glass structure as a comparative example. The baked color is shown respectively. In addition, the toasting time for all tests was set at 250° C. for 3 minutes, and all three heaters 51 to 53 were operated to perform toasting.

As shown in FIG. 8, (a) showing the top surface browning color of the toaster oven of this embodiment equipped with the door 20 having a double glass structure shows the surface of four pieces of bread placed on the cooking grid 41. On the other hand, the top surface of the comparative example toaster oven with a single glass door was obviously lighter in color, indicating that the oven was not heated sufficiently. In addition, there is a clear difference in the level of browning between the upper two sheets in FIG. 8(b), that is, the two sheets on the side closer to the door, and the two sheets on the lower side closer to the back wall. It can be seen that the temperature distribution inside the heating chamber is also non-uniform compared to the toaster oven according to this embodiment which has a door with a double glass structure.

Even in the state of the bottom surface of the toast shown in FIG. 9, the browning color in the toaster oven according to this embodiment of the double-glazed door shown in FIG. 9(a) is different from that of the toast shown in FIG. It can be seen that in toaster ovens with glass doors, the browning is lighter, and the browning varies greatly depending on the position on the cooking grid.

In this way, even when toast is actually baked, the toaster oven according to this embodiment, which is equipped with the door 20 having a double glass structure including the outer glass 26 and the inner glass 27, can provide sufficient and more uniform heating. It was confirmed that this was done.

FIG. 10 is a diagram showing the heating state of quiche-style toast in which the top surface of the bread is slightly recessed and a cooked product of eggs, cheese, and milk is placed on top and toasted.

FIG. 10(a) shows the grilling marks in a toaster oven according to this embodiment with a double-glazed door, and FIG. 10(b) shows the grilling marks in a comparative example of a toaster oven with a single-panel glass door. It shows.

Further, FIG. 11 shows the results of measuring the temperature of the approximately central portion of the ingredients of the quiche-style toast shown in FIG. 10. In FIG. 11, a solid line 81 indicates a temperature change in the cheese on the toast surface in the toaster oven of this embodiment having a double glass structure.

As shown in FIG. 10, the oven of this embodiment with a double-glazed door can be used even when toasting foods such as eggs, cheese, and milk that require slow heating on top of bread. It can be seen that in the toaster, the entire surface of the cheese was evenly browned, and the toast surface was heated evenly, compared to the toaster oven of the comparative example which had a door with a single glass structure. Furthermore, from the temperature change results shown in Figure 11, in the toaster oven of this embodiment with a double glass door, the temperature inside the cheese reached approximately 100°C after 15 minutes of cooking time; (The heating chamber temperature at this time was approximately 215 degrees Celsius).In the comparative example oven toaster with a single glass structure, the temperature inside the cheese remained at a low temperature of around 85 degrees Celsius (the heating chamber temperature at this time was approximately 210 degrees Celsius). This was confirmed. Although not shown in the diagram, when cooking in a toaster oven in the comparative example, when checking the cross section, it was confirmed that there remained a part of the cheese near the surface of the bread that was judged to be insufficiently heated. Ta. From this, it was confirmed that in the toaster oven according to this embodiment, the temperature rise inside the cheese was also large, and the cheese was heated more effectively.

Furthermore, the inventors have confirmed that the heating rate in a toaster oven with a double glass structure is equivalent to the heating rate in a toaster oven with a single glass structure in about 2 and a half minutes. It was found that the cooking time required for cooking could be reduced to two and a half minutes.

FIG. 12 is a diagram showing the moisture evaporation rate inside the bread when toasted in a toaster oven.

In FIG. 12, the reference numeral 91 on the left shows the moisture evaporation rate of a comparative example toaster oven having a door with a single glass structure, and the reference numeral 92 on the right shows the water evaporation rate of a toaster oven with a door of a double glass structure. It shows the water evaporation rate in the toaster oven according to the embodiment.

More specifically, the moisture evaporation rate is calculated from the change in weight before and after toasting a loaf of bread. The water evaporation rate was defined as a percentage of the water content. For each, two slices of bread were toasted and the weight reduction rate was calculated when the weight before heating was 65 g.

In the toaster oven having a single-glass door shown by reference numeral 91 in FIG. 12, the weight of the first piece of toast before toast was 64.6 g, but the weight after 3 minutes of toast cooking was 64.6 g. was 59.3g. In addition, the second piece of toast weighed 55.5g instead of 60.6g before toasting. This was converted to 65 g, giving a water evaporation rate of 8.2%.

On the other hand, in the toaster oven of this embodiment having a double glass door, the first piece of toast changes from 65.1g to 60.1g, and the second piece of toast changes from 65.0g to 60.1g. It became 0g. The amount of water evaporation determined from this result was 7.7%.

In this way, in the toaster oven according to the present embodiment, by adopting the double glass structure of the outer glass 26 and the inner glass 27, not only the amount of heat but also the amount of moisture escaping from inside the heating chamber 50 is reduced. This was confirmed. For this reason, toaster ovens with double-paned glass doors suppress moisture escaping during cooking, giving the surface a crispy texture compared to conventional toaster ovens with single-pane doors. It was confirmed that it was possible to prepare toast with a chewy texture on the inside.

FIG. 13 shows thermographic measurement results showing how heat is transferred to the front of the toaster oven. FIG. 13(a) shows the measurement results for the toaster oven of this embodiment, and FIG. 13(b) shows the measurement results for the toaster oven having a door with a single glass structure as a comparative example. In both cases, the condition in which the temperature in the heating chamber is most likely to rise is shown when no food is placed in the heating chamber and the set temperature is 250° C. for 10 minutes. At this time, the temperature inside the heating chamber is considered to have reached the set temperature of about 250°C. In addition, a resin cup was placed in the center of the toaster oven door at a distance of about 12 cm from the main body, and measurements were taken using a thermography measurement point at the spout at the tip of the cup.

As shown in FIG. 13(a), in the toaster oven of this embodiment, even when the temperature in the heating chamber exceeds 200°C, the temperature rise of the handle 21 above the door 20 is small, at about 26 to 27°C. ing. Furthermore, the temperature at the spout at the tip of the cup is 30.4°C, as shown in the figure.

On the other hand, in the comparative example toaster oven having a door with a single glass structure shown in FIG. It can be seen that the temperature has risen to 40.4°C, which is over 40°C.

Note that the toaster oven of this embodiment shown in FIG. 13(a) has a lower part of the door and the lower part of the outer shell of the toaster body than the toaster oven of the comparative example shown in FIG. 13(b). It can be confirmed that the temperature is high, exceeding 40°C. As mentioned above, in the toaster oven according to the present embodiment, the door has a double glass structure and is further provided with a rear surface that protrudes so that the inner glass of the door is located inside the heating chamber. This is thought to reflect the measurement results in which the temperature inside the heating chamber is higher even if the heating conditions of the heater are the same because the temperature inside the heating chamber is prevented from escaping between the door and the door.

As explained above, in the toaster oven shown in this embodiment, the door covering the front of the heating chamber has a double-glazed structure including an outer glass and an inner glass, thereby effectively preventing the temperature inside the heating chamber from escaping. This allows the temperature inside the heating chamber to be raised to a higher temperature. Furthermore, in the toaster oven according to this embodiment, the inside of the double-glazed door is connected to the outside of the toaster oven, so that the heat inside the heating chamber is transferred to the outside glass or a cup placed near the door. transmission can be effectively prevented.

For example, even when cooking at a high temperature for the longest period of time, such as gratin, for 30 minutes, when the temperature inside the heating chamber is set at 250°C, the temperature of the outer surface of the outside glass is set at 180°C in the case of a toaster oven with a single glass structure. We were able to lower the temperature by about 40 degrees Celsius to around 140 degrees Celsius. In addition, in the case of toasting a single piece of bread, the temperature of the outer glass surface after 3 minutes of toasting time was able to be lowered from 100°C in the case of a single glass structure to 40°C, about 60°C lower.

Furthermore, the double-glazed structure prevents the temperature and moisture inside the heating chamber from escaping through the gap between the door and the door, which reduces uneven browning during toasting and prevents the bread from drying out before and after toasting. It was confirmed that the water evaporation rate can also be reduced.

In the above explanation, the central part of the back of the door is made to protrude and the inner glass is placed inside the heating chamber in the example shown below. Since the inner glass is located in the heating chamber, the effect of preventing heat and moisture from escaping within the heating chamber is exhibited. Furthermore, in the above embodiment, the area of the inner glass is made smaller than the area of the outer glass, and the lower end of the inner glass is positioned above the position of the cooking grate. The area, and especially the vertical and horizontal placement of the inner glass, are determined by factors such as the escape of heat from the heating chamber, the amount of heat transmitted to the outside via the double glass, and the overall weight and thickness of the door. It can be determined as appropriate by taking into account the shape and the design of the toaster oven.

In the toaster oven of the present disclosure, the door that covers the front of the heating chamber has a double glass structure, and the space inside the door is connected to the outside, thereby improving heating efficiency and suppressing uneven heating. This is useful in that it can effectively reduce the conduction of heat toward the front of the door.

20 Door 26 Outside glass (first glass)
27 Inner glass (second glass)
41 Cooking net 50 Heating chamber 51 Upper heater (heater)
52, 53 Lower heater (heater)
60 space

Claims (3)

a heating chamber;
an openable/closable door that covers the front of the heating chamber;
a cooking net placed in the heating chamber on which the food to be cooked is placed;
comprising at least one of an upper heater disposed above the cooking grate in the heating chamber and a lower heater disposed below the cooking grate in the heating chamber;
The door includes a first glass disposed on the front side and a second glass disposed on the heating chamber side and having a smaller area than the first glass, and the first glass and the second glass are disposed on the heating chamber side. A space inside the door formed between the door and the glass is connected to the outside,
The second glass is arranged so as to protrude toward the heating chamber so that its front surface is located on the back side of the heating chamber side of the door,
A surface of the door on the heating chamber side has a curved surface that curves from a peripheral portion to a position where the second glass protrudes toward the heating chamber ,
A predetermined area that allows air to flow between the space inside the heating chamber and the outside between the surface of the upper end portion of the door on the side of the heating chamber and the front surface of the casing above the opening portion of the heating chamber. A toaster oven characterized by having a gap formed therein . The toaster oven according to claim 1, wherein a lower end of the second glass is located above the cooking grate. The amount of protrusion of the second glass toward the inside of the heating chamber is set such that when the door is closed, the second glass is close to a front end portion of the cooking plate placed on the cooking grid. The toaster oven according to claim 1 or 2.