A microwave oven utensil

Abstract

The present disclosure provides a microwave oven utensil, which comprises a pot body and a base matched with the outer bottom of the pot body, and a wave-absorbing heating layer is arranged on the base; a metal handle is connected to the pot body; a handle is connected to the metal handle; a connecting part, a heat insulation part and a holding part are sequentially arranged on the handle in the direction away from the pot body; the connecting part is connected with the metal handle; a first protruding strip is arranged on the outer periphery of the end of the heat insulation part close to the holding part. The present disclosure can prevent the microwave oven utensil from scalding hands when taking and placing after heating.

Description

Technical Field

[0001] This disclosure relates to the field of microwave oven heating appliances technology, specifically to a microwave oven dish. Background Technology

[0002] Microwave ovens are one of the most commonly used cooking appliances for heating food, and microwave-safe containers are gradually becoming more widely accepted.

[0003] Patent CN221035871U discloses a microwave-safe egg-cooking dish. The proposed solution uses a silicone sleeve on the end of the handle for heat insulation. However, due to the large contact area between the silicone sleeve and the handle, the heat insulation effect is not ideal.

[0004] How to prevent microwave-safe containers from burning your hands after heating is one of the most important problems that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this disclosure is to provide a microwave oven utensil to overcome the shortcomings of the prior art, which can effectively insulate heat and prevent the microwave oven utensil from being too hot to handle when taking it out after heating.

[0006] This disclosure discloses a microwave oven utensil, including a pot body and a base adapted to the bottom of the pot body, wherein the base is provided with a microwave absorbing heating layer; a metal handle is connected to the pot body; wherein a handle is connected to the metal handle. Along the direction away from the pot body, the handle is provided with a connecting part, a heat insulation part and a gripping part in sequence; the connecting part is connected to the metal handle; the outer periphery of the heat insulation part near the gripping part is provided with a first protrusion.

[0007] In the microwave oven utensil described above, optionally, the connecting part has a connecting hole on the side opposite to the heat insulation part for inserting the metal handle, and the connecting hole is a blind hole; The sidewall of the connecting hole is provided with a plurality of second protrusions; the second protrusions are arranged along the depth direction of the connecting hole.

[0008] In the microwave oven dish described above, optionally, the second protrusion has a guide surface at one end of the connection hole opening, the guide surface being inclined inward toward the bottom of the connection hole.

[0009] In the microwave oven utensil described above, optionally, the pot body is a metal pot, and the opening of the pot body is provided with an outward flange, part of which extends outward to form the metal handle; The metal handle is provided with a mounting portion at one end away from the pot body; the mounting portion has a continuously bent bending area; The bent area abuts against the second protrusion and has a gap between it and at least a portion of the inner wall of the connecting hole.

[0010] In the microwave oven utensil described above, optionally, the heat insulation part is connected to a first surface of the connecting part, the first surface being opposite to the opening of the connecting hole and perpendicular to the depth direction of the connecting hole; The connection between the heat insulation part and the connecting part is misaligned with the projection of the connecting hole on the first surface.

[0011] In the microwave oven utensil described above, optionally, the connection between the heat insulation part and the connecting part is located on the second surface of the connecting part, and the second surface is the outer peripheral side of the connecting hole.

[0012] In the microwave oven utensil described above, optionally, a heat insulation groove is formed between the heat insulation portion and the first surface; the connection hole is opposite the side wall of the heat insulation groove.

[0013] In the microwave oven utensil described above, optionally, the bottom of the connection hole is further provided with a protrusion to prevent the metal handle from contacting the bottom of the connection hole.

[0014] In the microwave oven dish described above, the protrusion may optionally be a circular protrusion, a conical protrusion, or a strip-shaped protrusion.

[0015] The microwave oven dish described above may optionally include a lid, the edge of which is provided with a plurality of fastening parts; Multiple fastening parts are connected to the edge of the pot body; a notch is formed between two adjacent fastening parts, and at least one of the notches is adapted to the metal handle.

[0016] In the microwave oven utensil described above, optionally, the lid has a metal layer.

[0017] In the microwave oven utensil described above, optionally, a baffle extending outward is provided on the outer periphery of the end of the connecting portion near the pot body.

[0018] In the microwave oven dish described above, optionally, the base has a groove adapted to the bottom of the pot body, the wall of the groove being formed by the microwave-absorbing heating layer.

[0019] According to another aspect of this disclosure, a microwave oven utensil is also provided, which further includes a handle connected to the metal handle; One end of the handle is provided with a connection hole for connecting to the metal handle; The inner wall of the connecting hole is provided with a second protrusion.

[0020] Compared with the prior art, this disclosure provides a handle fitted onto a metal handle connected to the pot body. The handle is further divided into a connecting portion, a heat-insulating portion, and a grip portion, arranged sequentially along the direction away from the pot body. A first protruding strip is provided at the end of the heat-insulating portion near the grip portion. The heat-insulating portion further reduces the heat transferred from the metal handle to the grip portion, thus preventing the grip portion from becoming excessively hot after heating. The first protruding strip makes the grip portion easily distinguishable to the user, preventing the user from coming into contact with the hot connecting portion during use. Attached Figure Description

[0021] Figure 1 This is a three-dimensional diagram of a microwave oven utensil as disclosed in this publication; Figure 2 This is an exploded view of the microwave oven container presented in this publication; Figure 3 This is a perspective view of the handle presented in this publication; Figure 4 This is a perspective view of the handle presented in this publication from another angle; Figure 5 This is a schematic diagram of the handle structure proposed in this disclosure; Figure 6 This is a side view of the handle disclosed herein; Figure 7 yes Figure 6 Sectional view along the AA direction; Figure 8 This is a three-dimensional cross-sectional view of the handle presented in this disclosure; Figure 9 This is a cross-sectional view of a microwave oven utensil in another implementation proposed in this disclosure.

[0022] Explanation of reference numerals in the attached figures: 1-Pot body, 2-Base, 3-Handle, 4-Lid; 11-Metal handle, 12-Flanged edge, 13-Mounting part; 131 - Bending area; 21 - Groove; 22 - Wave-absorbing heating layer; 31-Connecting part, 32-Insulating part, 33-Holding part, 34-Insulating groove; 311-First surface, 312-Second surface, 313-Connecting hole, 314-Second protrusion, 315-Guide surface, 316-Protrusion; 321 - First convex bar; 41-Snap-fit ​​part, 42-Notch, 43-Metal layer, 44-Baffle. Detailed Implementation

[0023] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0024] Regarding the problems mentioned in the background art, the main reason for the unsatisfactory heat insulation effect is that the contact area between the metal handle of the pot and the silicone sleeve is relatively large. After heating in the microwave oven, some heat is transferred from the pot to the silicone sleeve. On the other hand, since the pot is made of metal, its lid has a notch corresponding to the metal handle. This notch is not easy to seal completely. Therefore, after heating, some hot air will escape from this notch, which further exacerbates the problem of the handle overheating.

[0025] Please refer to Figures 1 to 8 To address the aforementioned problems, this disclosure proposes a microwave-safe dish, comprising a pot body 1 and a base 2 adapted to the outer bottom of the pot body 1. A metal handle 11 is connected to the pot body 1; the base 2 is provided with a microwave-absorbing heating layer 22. A handle 3 is connected to the metal handle 11. The pot body 1 is made of metal and is used to transfer the heat generated by the microwave-absorbing heating layer 22 on the base 2 in a microwave environment to the pot body 1, thereby heating the food inside the pot body 1. In specific implementations, the pot body 1 and the base 2 can be detachable; for example, the pot body 1 can be directly placed on the base 2; alternatively, the pot body 1 and the base 2 can be integrated into a single structure.

[0026] Please refer to Figures 3 to 8 To prevent burns to the user during handling, this disclosure further designs the handle 3. Along the direction away from the pot body 1, the handle 3 is sequentially provided with a connecting portion 31, a heat-insulating portion 32, and a grip portion 33. The connecting portion 31 connects to the metal handle 11. The outer periphery of the heat-insulating portion 32 near the grip portion 33 has a first protrusion 321. The main function of the connecting portion 31 is to connect the handle 3 to the metal handle 11. Simultaneously, through its structural design, the connecting portion 31 also reduces heat conduction. Since the metal handle 11 is only located within the connecting portion 31, the heat transferred from the connecting portion 31 to the grip portion 33 is reduced via the heat-insulating portion 32, thus preventing the grip portion 33 from becoming too hot. The first protrusion 321 allows the user to distinguish the grip portion 33, and its presence also makes the heat-insulating portion 32 difficult to grip, preventing the user's hand from touching the connecting portion 31. Furthermore, the presence of the first protrusion 321 increases the cross-section at that location, which further reduces the heat transferred to the grip portion 33.

[0027] It should be noted that the handle 3 in this disclosure should be made of a material with poor thermal conductivity, such as plastic. The plastic referred to here is a plastic with poor thermal conductivity, excluding modified thermally conductive plastics.

[0028] Please refer to Figure 3and Figure 4 To achieve the connection between the connecting part 31 and the metal handle 11 and reduce the heat conducted from the metal handle 11 to the connecting part, the connecting part 31 has been further designed in this invention. A connecting hole 313 for inserting the metal handle 11 is provided on the side of the connecting part 31 away from the heat insulation part 32. The connecting hole 313 is a blind hole. That is, in specific implementations, the connecting hole 313 is only located inside the connecting part 31. Considering that the amount of heat conducted from the metal handle 11 to the connecting part 31 is related to the contact area between the two, to further reduce the heat transferred from the metal handle 11 to the connecting part 31, in some implementations, a plurality of second protrusions 314 are provided on the sidewall of the connecting hole 313; the second protrusions 314 are arranged along the depth direction of the connecting hole 313. By providing the second protrusions 314, the contact area between the inner wall of the connecting hole 313 and the metal handle 11 can be reduced. In practical applications, the second protrusions 314 can extend from the opening of the connecting hole 313 to the bottom of the connecting hole 313.

[0029] In specific implementation, the cross-sectional shape of the connecting hole 313 is determined according to the shape of the metal handle 11. For example, when the metal handle 11 is a flat rectangle or approximately rectangular, the connecting hole 313 can be set to a rectangular cross-section. The cross-sectional size of the connecting hole 313 is slightly larger than the cross-sectional size of the metal handle 11. Due to the presence of the second protrusion 314, after the metal handle 11 is connected to the connecting part 31, there is a gap between the surface of the metal handle 11 and the wall of the connecting hole 313. Only the metal handle 11 and the second protrusion 314 are in contact, which can greatly reduce the contact area between the metal handle 11 and the connecting part 31.

[0030] In some implementations, the second protrusion 314 may be provided on each sidewall of the connecting hole 313, or it may be provided on only some sidewalls. For the flat metal handle 11, whose lower surface and lower surface area are relatively large, the second protrusion 314 may be provided only on the walls corresponding to the upper and lower surfaces of the metal handle 11 and the connecting hole 313; preferably, to ensure connection stability, in some implementations, at least two second protrusions 314 are provided on each wall. It should be noted that when the connecting hole 313 is a rectangular hole or other polygonal hole, the second protrusion 314 may also be provided at the included angle between two adjacent walls of the connecting hole 313.

[0031] In practical applications, to ensure a stable connection between the connecting part 31 and the metal handle 11, the second protrusion 314 needs to be able to tightly abut against the surface of the metal handle 11. This requires the size of the protrusion of the second protrusion 314 to be slightly larger than the thickness of the metal handle 11. In this case, it would be inconvenient to insert the metal handle 11 into the connecting hole 313. Therefore, considering the ease of installation, the end of the second protrusion 314 located at the opening of the connecting hole 313 has a guide surface 315, which is inclined inward toward the bottom of the connecting hole 313. In addition, to facilitate installation, a chamfer or other structure can be provided at the end of the metal handle 11 away from the pot body 1 to facilitate the insertion of the metal handle 11 into the connecting hole 313.

[0032] In practical applications, the pot body 1 is made of metal to facilitate heat conduction. Considering production costs, the pot body 1 and the metal handle 11 are usually integrally formed. In some implementations, the opening of the pot body 1 has an outward-facing flange 12, with a portion of the flange 12 extending outward to form the metal handle 11. In specific implementations, one part of the flange 12 bends outward, while the other part extends outward to form the metal handle 11.

[0033] In the aforementioned structure, the contact area between the metal handle 11 and the connecting portion 31 can be greatly reduced; that is, the metal handle 11 only contacts the second protrusion 314. A mounting portion 13 is provided at the end of the metal handle 11 away from the pot body 1; the mounting portion 13 has a continuously bent bending area 131; that is, the bending area 131 along the length direction of the metal handle 11 has a wavy structure, the bending area 131 abuts against the second protrusion 314, and has a gap between it and at least a portion of the inner wall of the connecting hole 313. Because the bending area 131 has a wavy structure, when the mounting portion 13 is inserted into the connecting hole 313, the contact area between the bending area and the second protrusion 314 is further reduced, which is beneficial for further reducing heat conduction to the connecting portion 31.

[0034] In practical implementation, to improve the heat insulation effect and further reduce the temperature rise of the grip portion 33 during heating, the heat insulation portion 32 is connected to the first surface 311 of the connecting portion 31. The first surface 311 is opposite to the opening of the connecting hole 313 and perpendicular to the depth direction of the connecting hole 313. The connection between the heat insulation portion 32 and the connecting portion 31 is misaligned with the projection of the connecting hole 313 on the first surface 311. Specifically, the cross-sectional area of ​​the heat insulation portion 32 is smaller than the cross-sectional area of ​​the connecting portion 31, thereby reducing the heat transferred from the connecting portion 31 to the grip portion 33.

[0035] In some implementations, the connection between the heat insulation part 32 and the connecting part 31 is located on the second surface 312 of the connecting part 31, and the second surface 312 is perpendicular to the first surface 311. Since a second protrusion 314 is provided on the wall of the connecting hole 313, the heat diffused to the second surface 312 through the side wall of the connecting hole 313 can be reduced. By placing the connection between the heat insulation part 32 and the connecting part 31 on the second surface 312, the transfer of heat to the grip part 33 can be effectively reduced.

[0036] Preferably, a heat insulation groove 34 is formed between the heat insulation part 32 and the first surface 311; the connecting hole 313 is directly opposite the side wall of the heat insulation groove 34. That is, by setting the connecting hole 313 directly opposite the side wall of the heat insulation groove 34, the heat transferred from the end of the metal handle 11 to the grip part 33 can be effectively reduced.

[0037] In some implementations, to further reduce the contact area between the metal handle 11 and the connecting part 31, a protrusion 316 is provided at the bottom of the connecting hole 313. That is, by providing the protrusion 316 at the bottom of the connecting hole 313, during installation, the end of the metal handle 11 abuts against the protrusion 316, preventing complete contact between the end of the metal handle 11 and the end of the connecting hole 313. This helps reduce the contact area between the bottom of the connecting hole 313 and the end of the metal handle 11, thus reducing heat transfer. In some implementations, the protrusion 316 is a circular protrusion, a conical protrusion, or a strip-shaped protrusion.

[0038] In some implementations, a lid 4 is also included, with multiple fastening portions 41 along its edge. These fastening portions 41 engage with the edge of the pot body 1; a notch 42 is formed between adjacent fastening portions 41, and at least one notch 42 is adapted to fit the metal handle 11. A metal layer 43 is provided on the lid 4, the main function of which is to reflect microwaves and prevent them from directly heating the food inside the pot body 1.

[0039] Due to the presence of the notch 42, and the fact that the upper surface of the connection between the metal handle 11 and the pot body 1 is generally relatively flat, hot air from inside the pot body 1 can easily escape through the gap between the notch 42 and the metal handle 11 during heating, causing the handle 3 to be heated by the escaped hot air. To solve this problem, some implementations have made further improvements, providing an outwardly extending baffle 44 on the outer periphery of the end of the connecting part 31 near the pot body 1. In specific implementations, the baffle 44 can extend vertically or outwards, as long as it can prevent hot air from inside the pot body 1 from being ejected towards the grip part 33. This disclosure does not limit the specific shape of the baffle 44.

[0040] In practical applications, the shape of the pot body 1 can be determined according to actual needs, and this disclosure does not limit it. For example, the pot body 1 can have a flat bottom or a convex bottom that protrudes away from the pot opening. For example, when the pot body 1 has a convex bottom, its shape can be a hemispherical, semi-ellipsoidal, or other arc-shaped structure, and this disclosure does not limit it. It should be noted that regardless of the shape of the pot body 1, the shape of the base 2 is adapted to it. The adaptation here means that at least one surface of the base 2 can fit against the outer periphery of the pot body 1. This facilitates the base 2 to conduct heat generated by absorbing microwaves to the pot body 1, thereby heating the food inside the pot body 1.

[0041] To improve the heating efficiency of the pot body 1, the base 2 has a groove 21 that fits the bottom of the pot body 1, and the wall of the groove 21 is formed by a microwave absorbing heating layer 22. In this way, the contact area between the microwave absorbing heating layer 22 and the pot body 1 can be increased, which is beneficial for heating the food in the pot.

[0042] Please refer to Figure 9 According to another aspect of this disclosure, a microwave oven utensil is also provided, comprising a pot body 1 and a base 2 adapted to the outer bottom of the pot body 1, with a metal handle 11 connected to the pot body 1; it also includes a handle 3 connected to the metal handle 11; one end of the handle 3 is provided with a connection hole 313 for connecting to the metal handle 11; the inner wall of the connection hole 313 is provided with a second protrusion 314. By providing the second protrusion 314, the heat transferred from the metal handle 11 to the handle 3 can be reduced, which helps to prevent the handle 3 from overheating during use. Specifically, in this disclosure, the connection hole 313 is provided with a second protrusion 314 and a protrusion 316. The function of the second protrusion 314 and the protrusion 316 is to reduce the contact area between the metal handle 11 and the handle 3, thereby reducing heat transfer. The structure, arrangement, and function of the second protrusion 314 and the protrusion 316 can all refer to the aforementioned scheme. In specific implementation, the base 2 and the cover 4 can also refer to the above scheme, which will not be repeated here; the only difference from the above scheme is that the first protrusion 321 is omitted in this scheme.

[0043] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0044] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0045] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0046] It should also be noted that in the systems and methods of this disclosure, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0047] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0048] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0049] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A microwave oven utensil, comprising a pot body (1) and a base (2) adapted to the outer bottom of the pot body (1), wherein the base (2) is provided with a microwave-absorbing heating layer (22); a metal handle (11) is connected to the pot body (1); characterized in that, A handle (3) is connected to the metal handle (11); Along the direction away from the pot body (1), the handle (3) is provided with a connecting part (31), a heat insulation part (32) and a grip part (33) in sequence; the connecting part (31) is connected to the metal handle (11); the heat insulation part (32) has a first protrusion (321) on the outer periphery of one end near the grip part (33).

2. The microwave oven utensil according to claim 1, characterized in that, The connecting part (31) is provided with a connecting hole (313) for inserting the metal handle (11) on the side opposite to the heat insulation part (32). The connecting hole (313) is a blind hole. The sidewall of the connecting hole (313) is provided with a plurality of second protrusions (314); the second protrusions (314) are arranged along the depth direction of the connecting hole (313).

3. The microwave oven utensil according to claim 2, characterized in that, The second protrusion (314) has a guide surface (315) at one end of the opening of the connecting hole (313), and the guide surface (315) is inclined inward in the direction toward the bottom of the connecting hole (313).

4. The microwave oven utensil according to claim 3, characterized in that, The pot body (1) is a metal pot, and the opening of the pot body (1) is provided with an outward flange (12), and part of the flange (12) extends outward to form the metal handle (11). The metal handle (11) has a mounting part (13) at one end away from the pot body (1); the mounting part (13) has a continuous bending area (131). The bending area (131) abuts against the second protrusion (314) and has a gap between it and at least a portion of the inner wall of the connecting hole (313).

5. The microwave oven utensil according to claim 2, characterized in that, The heat insulation part (32) is connected to the first surface (311) of the connecting part (31), and the first surface (311) is away from the opening of the connecting hole (313) and perpendicular to the depth direction of the connecting hole (313). The connection between the heat insulation part (32) and the connecting part (31) is misaligned with the projection of the connecting hole (313) on the first surface (311).

6. The microwave oven utensil according to claim 5, characterized in that, The connection between the heat insulation part (32) and the connecting part (31) is located on the second surface (312) of the connecting part (31), and the second surface (312) is the outer peripheral side of the connecting hole (313).

7. The microwave oven utensil according to claim 6, characterized in that, A heat insulation groove (34) is formed between the heat insulation part (32) and the first surface (311); the connecting hole (313) is directly opposite the side wall of the heat insulation groove (34).

8. The microwave oven utensil according to claim 2, characterized in that, The bottom of the connecting hole (313) is also provided with a protrusion (316) to prevent the metal handle (11) from contacting the bottom of the connecting hole (313).

9. The microwave oven utensil according to claim 8, characterized in that, The protrusion (316) is a circular protrusion, a conical protrusion, or a strip-shaped protrusion.

10. The microwave oven utensil according to any one of claims 1-9, characterized in that, It also includes a cover (4), the edge of which is provided with a plurality of fastening parts (41). Multiple fastening parts (41) are connected to the edge of the pot body (1); a notch (42) is formed between two adjacent fastening parts (41), and at least one of the notches (42) is adapted to the metal handle (11).

11. The microwave oven utensil according to claim 10, characterized in that, The cover (4) is provided with a metal layer (43).

12. The microwave oven utensil according to claim 1, characterized in that, The connecting part (31) has an outwardly extending baffle (44) on the outer periphery of one end near the pot body (1).

13. The microwave oven utensil according to claim 1, characterized in that, The base (2) has a groove (21) adapted to the bottom of the pot body (1), and the wall of the groove (21) is formed by the microwave absorbing heating layer (22).

14. A microwave oven utensil, comprising a pot body (1) and a base (2) adapted to the outer bottom of the pot body (1), wherein a metal handle (11) is connected to the pot body (1); characterized in that, It also includes a handle (3) connected to the metal handle (11); One end of the handle (3) is provided with a connection hole (313) for connecting with the metal handle (11). The inner wall of the connecting hole (313) is provided with a second protrusion (314).

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