JP4444268B2 - Aluminum lunch box and method of attaching flaps in aluminum lunch box - Google Patents

Description

  The present invention provides a rotatable flap on both sides of a top plate to be crowned on the top of the container body, and the container body and the top plate are detachably fitted to each other by rotating the flap. The present invention relates to an aluminum lunch box, and more particularly, to a structure and method for attaching a flap in a rotatable manner.

  Conventionally, an aluminum lunch box as shown in FIG. The aluminum lunch box 1a includes a container body 2a having an upper opening made of aluminum, a detachable aluminum lid body 3a for covering the opening, and a container body extending from both sides of the lid body 3a. And a lock piece 4a swingable toward both sides of 2a. The lock piece 4a is formed by bending a steel wire, and is pivotally coupled to a sheet metal bearing body 5a, 5a whose both ends are fixed to the side of the lid 3a with rivets or the like so as to be rotatable in the vertical direction. Has been. Therefore, when the lock piece 4a is rotated downward, the fitting means 6a of the lock piece 4a is fitted to the fitted means 7a of the container body 2a, thereby holding the lid 3a in the covered state. The fitted means 7a is formed by recessing the bottom of the aluminum container body 2a.

  On the other hand, a plastic lunch box as shown in FIG. 14B is known. The plastic lunch box 1b includes a container body 2b having an upper opening made of plastic, a detachable plastic lid body 3b for covering the opening, and a container body extending from both sides of the lid body 3b. 2b, and a plastic flap 4b swingable toward both side portions of 2b. The flap 4b is pivotally coupled to a bearing body 5b, 5b integrally formed on both sides of the lid 3b so as to be rotatable in the vertical direction. As a conventional manner of attaching the flap, for example, a support shaft protruding from both ends of the flap 4b is forcibly fitted in a shaft support hole provided in the bearing bodies 5b and 5b, so that the flap is rotatable around the support shaft. For example, the flap 4b and the bearing bodies 5b and 5b are screwed, and the flap is rotatable around the screw. The flap 4b is integrally formed with a fitting means 6b serving as a claw rib. Therefore, when the flap 4b is rotated downward, the fitting means 6b of the flap 4b is fitted to the fitted means 7b of the container body 2b, and the lid body 3b is held in the covered state. In addition, the to-be-fitted means 7b is formed in the opening edge of the container main body 2b.

JP-A-9-154617 JP 2003-135127 A

  As shown in FIG. 14 (a), the aluminum lunch box 1a is formed by bending the lock piece 4a with a steel wire, so that the appearance is not beautiful and the fitted portion 7a is provided. In addition, the bottom of the container body 2a must be recessed and the container body 2a has a problem of being deformed.

  On the other hand, as shown in FIG. 14B, the plastic lunch box 1b has the advantage that the appearance of the flap 4b is good and the appearance is beautiful, and that the container body 2b does not need to be deformed. On the other hand, the plastic lunch box 1b has the following problems because the flap is attached so as to be pivotable in the vertical direction by forcibly fitting or screwing. That is, in the case of attachment by forced fitting, there is a possibility that the flap may be deformed or damaged when the flap is attached, and in order to prevent this, careful work is required, and work efficiency is deteriorated. In addition, in the case of attachment by screwing, the screw is rotated as the flap is rotated in the vertical direction, and the screwed state may be loosened. In the worst case, the screw is detached and the flap is dropped. is there.

  By the way, among users, aluminum as a material for lunch boxes is still very popular. Therefore, for example, it is desired that substantially the same lunch box as the above-mentioned plastic lunch box is formed of aluminum, but in that case, it is preferable to solve the above-described problem particularly regarding the manner of attaching the flap.

  The present invention has been made for the purpose of solving the above-mentioned problems, and substantially the whole lunch box is made of aluminum, and the manner of attaching the flap is improved, so that the flap can be attached easily and efficiently. In addition, there is provided a lunch box that maintains a stable pivotal state without loosening the attached state of the flap even when the flap is repeatedly operated. The present invention also provides a method for attaching a flap in an aluminum lunch box.

In order to achieve the above-mentioned object, the aluminum lunch box of the present invention is configured as a solution means that an upper opening-shaped aluminum container body (2) and an upper part of the container body (2) are detachably covered. A bracket part (26) of an aluminum flap (4) which is composed of an aluminum top plate (3) to be crowned and which is rotatable up and down on bearing members (12) provided on both sides of the top plate. The fitting means (13) provided on the flap (4) and the fitted means (14) provided on both side walls of the container body (2) are detachably fitted to each other. It is an aluminum lunch box that constitutes attachment means , and the bearing member (12) is constituted by a long aluminum body formed separately from the top plate (3), and has bottomed holes at both ends. to form a shaft supporting hole (15) constituting a by fixing means (16) is fixed to the top plate member (3), said flap (4) is shaped to the bracket portion (26) In the state of being matched to the shaft supporting hole (15) of said bearing member through-hole (27) (12), said with to face the flange of the rivet body (43) and (42) to said bracket portion (26) The shaft portion (41) of the rivet body (43) is inserted into the shaft support hole (15), and the rivet body (43) is a shaft that passes through the flange portion (42) and the shaft portion (41). A head (44b) provided with a hole (43a) and detachably provided at the tip of a mandrel (45) inserted through the shaft hole (43a) from a state where it faces the shaft end of the shaft portion (41). By pulling out the mandrel (45), the tip (41a) of the shaft part (41) is deformed to expand, and the mandrel (45) is interposed between the flange part (42) and the bracket part (26). A gap (t) having a predetermined dimension corresponding to the thickness of the spacer (47) interposed when the spacer (47) is pulled out is formed, and the tip (41a) whose diameter has been deformed is formed on the inner surface of the shaft support hole (15). Separation of the mandrel (45) fixed by pressure welding The head (44b) is in a point formed by remaining inside the shaft supporting hole (15).

In this case, if the rivet body is made of aluminum in addition to the container main body, the top plate body and the flap made of aluminum, almost the entire appearance of the lunch box can be made of aluminum.

Further, the method of attaching the flap in the aluminum lunch box of the present invention is configured as a solution means that an upper opening-shaped aluminum container body (2) and aluminum that is detachably crowned on the upper part of the container body A bearing member (12) composed of a long aluminum body formed separately from the top plate on both sides of the top plate. With respect to the shaft support hole (15) constituting the bottomed hole provided at both ends of the member (12), the bracket portion (26) of the aluminum flap (4) is pivotably pivoted in the vertical direction , The fitting means (13) provided on the flap (4) and the fitted means (14) provided on both side walls of the container body (2) constitute fitting means that are detachably fitted to each other. regarding the aluminum lunch box made Te, wherein a method of attaching a flap (4) to the bearing member (12), from the flange portion (42) By using a shaft hole rivet body with a (43a) (43) penetrating along part (41) to extend to and axis, said bracket flange (42) of the rivet body (43) In a state where it faces the portion (26), the shaft portion (41) of the rivet body (43) is inserted into the shaft support hole (15) through the bracket portion (26) of the flap (4). At the time, by using a mandrel (45) provided with a separable head (44b) at the tip of the core shaft (44a), the head (44b) of the mandrel (45) is attached to the shaft of the rivet body (43). The mandrel (45) in a state where the mandrel (45) is inserted into the shaft hole (43a) of the rivet body (43). a step of inserting the shank of the rivet body (43) and (41) to said shaft supporting hole (15), by using a spacer (47) having a predetermined thickness of the flat plate, the rivet flange of the main body (43) Part (42) and the bracket (26) the spacer between the (47) a step of removably temporary, said flange portion and the (42) in a state pressed against said spacer (47) rivet body (43) from said mandrel (45) moved in the direction pulling and is pressed against fixed to the inner surface of the mandrel shank by a head (44b) of (45) (41) distal shaft by the (41a) diameter expansion deformation supporting hole (15) of the mandrel ( 45) separating the core shaft (44a) from the head (44b) and pulling it out , and leaving the separated head (44b) inside the shaft support hole (15), and then the spacer (47) Forming a gap (t) having a predetermined dimension corresponding to the thickness of the spacer (47) between the flange portion (42) and the bracket portion (26).

According to the present invention , an aluminum lunch box in which the container body 2 and the top plate 3 are formed of aluminum is provided, and the aluminum flap 4 is provided on the aluminum top plate 3 via the aluminum bearing member 12. Since it is provided, there is an advantage that the appearance is good and the appearance is beautiful, and that the container body made of aluminum does not need to be deformed.
Therefore, according to the present invention, with respect to such an aluminum lunch box, the bearing member 12 is composed of a long aluminum body formed separately from the top plate 3 and has bottomed holes at both ends. The shaft supports 15 and 15 are formed and fixed to the top plate 3 by the fixing means 16, and the bracket portions 26 and 26 of the flap 4 are fixed to the shaft members 15 and 15 of the bearing member 12 by the rivet body 43. mounting since enabling Rukoto in, the mounting is simple and work efficiency is improved.
At this time, the mandrel 45 for inserting the rivet body 43 into the shaft support hole 15 is configured such that the head 44b at the tip is separable, and the head 44b of the mandrel 45 is placed at the tip of the shaft 41 of the rivet body 43. When the tip 41a of the shaft portion 41 is expanded and deformed by pulling out the mandrel 45 from the state where the head 44 is faced, the head portion 44b is separated. For this reason, by using such a mandrel 45, after the attachment is completed in which the tip 41a of the shaft portion 41 of the rivet body 43 whose diameter is increased and deformed is pressed and fixed to the inner surface of the shaft support hole 15, the separated small head is separated. Only the portion 44 b remains inside the shaft support hole 15, and there is an advantage that the core shaft 44 a of the mandrel 45 does not remain in the shaft hole 43 a of the rivet body 43.
And, since the blind rivet usually pulls out the mandrel core shaft while pushing in the flange portion, when this is used for attaching the flap 4 of the lunch box, the flange portion comes into close contact with the bracket portion 26 of the flap 4, In contrast to hindering the free rotation operation of the flap 4, according to the present invention, the spacer 47 is always inserted when the mandrel 45 is pulled out between the flange portion 42 and the bracket portion 26. Since a gap t having a predetermined dimension corresponding to the wall thickness is formed, there is an effect that it is possible to provide a high-quality aluminum lunch box in which the vertical rotation of the flap 4 for attaching and removing the top plate 3 is good. is there.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, a lunch box 1 includes an upper-opening aluminum container body 2, an aluminum top plate body 3 detachably crowned on the upper part of the container body 2, and A flap 4 extending from both sides of the top plate 3 and swingable toward both sides of the container body 2 is provided. In the case of the illustrated embodiment, the upper opening of the container body 2 is covered with a flexible plastic inner lid 5, and the ceiling formed in an inverted dish shape with respect to the flange 6 of the inner lid 5. Although it is comprised so that the downward opening edge of the board 3 may contact | abut, it is not limited to this. For example, without providing the inner lid 5, the upper opening of the container body 2 may be directly covered with the top plate 3, and the lid 7 of the container body 2 may be configured by the top plate 3.

  In the case of the illustrated embodiment, as shown in FIG. 2, the inner lid body 5 has a seal packing 9 (see FIG. 13) fitted inside the peripheral strip 8 that bulges upward from the inner periphery of the flange 6. An edible tool 11 such as chopsticks is formed on the flat plate portion 10 surrounded by the stripes 8 so as to be freely housed.

  The flap 4 is pivotally connected to bearing members 12 provided on both sides of the top plate 3 so as to be pivotable in the vertical direction. The fitting means 13 (see FIG. 13) provided inside the flap 4 and the container body 2 The fitting means 14 which is detachably fitted to each other is constituted by the fitted means 14 provided on both side walls. Accordingly, as shown in FIG. 13, when the flap 4 is rotated downward in a state in which the top plate 3 is covered with the inner lid body 5 covered with the container main body 2, the fitting means 13 of the flap 4 becomes the container. The top plate 3 is held in a crowned state in a state in which it is fitted to the fitted means 14 of the main body 2 and the seal packing 9 of the inner lid 5 is brought into close contact with the opening edge of the container main body 2.

As shown in FIG. 2, the bearing member 12 is formed separately from the top plate body 3, constitutes a long body along both sides of the top plate body 3, and has a shaft support hole 15 that constitutes a bottomed hole at both ends. 15 are fixed to the top plate 3 by the fixing means 16. The bearing member 12 is made of aluminum, and in the case of the illustrated embodiment, a solid long body is constituted by aluminum, and the fixing means 16 is formed by an aluminum protrusion protruding from the long body. Yes. The protrusion constituting the fixing means 16 constitutes a rivet means for crushing the insertion end of the protrusion from the inside of the top plate 3 after being inserted into a hole penetrating the side wall of the top plate 3. However, the present invention is not limited to the illustrated embodiment, For example, while additionally provided a shaft receiving member 12 on the outside of the top plate body 3 is fixed with screws or the like from the inside of the top plate body 3 You may comprise as follows.

  The fitted means 14 is made of aluminum and is attached to both side walls of the container body 2, and is provided with locking ribs 17 on the lower edge. For this reason, the to-be-fitted means 14 comprises a solid elongate body with aluminum, and comprises the adhering means 18 with the aluminum protrusion protruded from the elongate body. The fixing means 18 constitutes a rivet means for crushing the insertion end of the protrusion from the inside of the container body 2 after the protrusion is inserted into the through hole in the side wall of the container body 2.

  FIG. 3 is a view showing how the flap 4 is attached to the bearing member 12. As shown in FIG. 3A, the flap 4 has bracket portions 26, 26 extending so as to follow both end portions 12 a, 12 a of the bearing member 12, and the bracket portions 26, 26 are connected to the bearing member 12. Through holes 27 and 27 having a slightly larger diameter than the formed shaft support holes 15 and 15 are formed. The bracket portions 26 and 26 are attached to both ends 12 a and 12 a of the bearing member 12, the through holes 27 and 27 are aligned so as to be on the same axis as the shaft support holes 15 and 15, and the blind rivet 40 is used to flap. 4 is fixed to the bearing member 12. The blind rivet 40 includes a rivet main body 43 and a mandrel 45, and is made of, for example, aluminum. The rivet body 43 includes a shaft portion 41 and a flange portion 42 provided at an end portion of the shaft portion 41, and forms a shaft hole 43a penetrating the shaft portion 41 and the flange portion 42 along the shaft center. The mandrel 45 has a core shaft 44a and a head portion 44b, and the head portion 44b is connected to the end of the core shaft 44a. In addition, it is preferable to form a groove or the like in the connecting portion between the head portion 44b and the core shaft 44a so that the core shaft 44a and the head portion 44b can be separated at a fixed location. 3A, the blind rivet 40 is inserted into the shaft hole 43a of the rivet main body 43 through the core shaft 44a of the mandrel 45, and the head 44b of the mandrel 45 is connected to the shaft 41 of the rivet main body 43. Used with the shaft facing the end. The head 44b of the mandrel 45 and the shaft part 41 of the rivet body 43 are inserted into the shaft support hole 15 through the through hole 27, and the mandrel 45 is removed from the rivet body 43 while pushing the flange part 42 toward the shaft support hole 15. When moved in the pulling direction, the head portion 44b of the mandrel 45 deforms the tip end of the shaft portion 41 to expand the diameter, and the shaft portion 41 is pressed and fixed to the inner surface of the shaft support hole 15. Thereby, the rivet main body 43 is fixed. When the mandrel 45 is further moved in the pulling direction, the head 44b is separated from the core shaft 44a of the mandrel 45 and stays inside the shaft support hole 15, while the core shaft 44a is pulled out from the shaft hole 43a of the rivet body 43. . As a result, as shown in FIG. 3B, the rivet body 43 remains in a state of being fixed to the shaft support hole 15, and the flap 4 is attached to the bearing member 12 by the rivet body 43.

  FIG. 4 is an enlarged cross-sectional view showing an internal structure in a state where the flap 4 is attached to the bearing member 12. As described above, the shaft portion 41 of the rivet main body 43 is in a state where the tip end portion 41a is expanded and deformed and is in pressure contact with the inner surface of the shaft support hole 15. In this state, the rivet main body 43 does not advance or retreat in the axial direction. It is fixed to the support hole 15. In particular, in the present embodiment, a gap t of about 0.5 mm is provided between the flange portion 42 and the bracket portion 26 in a state where the rivet body 43 is fixed to the shaft support hole 15.

  Normally, when attaching a blind rivet, the mandrel core shaft is pulled out while pushing the flange part as described above. Therefore, when the rivet body is fixed, the flange part and the bracket part are in close contact with each other, and the gap as described above t does not occur. However, when the flange portion 42 of the rivet body 43 and the flange portion 26 of the flap 4 are in close contact with each other, the frictional resistance when the flap 4 is rotated increases, and the free rotation operation of the flap 4 is obstructed. Therefore, in this embodiment, by providing a gap t of about 0.5 mm between the flange portion 42 and the bracket portion 26 and fixing the rivet body 43, the friction resistance is eliminated, and the flap 4 is centered on the shaft portion 41. It is configured to be rotatable in the vertical direction. Hereinafter, the attachment procedure of the flap 4 will be described with reference to FIGS.

  First, as shown in FIG. 5, the bracket portion 26 of the flap 4 is arranged along the end portion of the bearing member 12 and positioned so that the through hole 27 and the shaft support hole 15 are aligned on the same axis. At this time, you may fix to the state which positioned the flap 4 and the bearing member 12 using the jig | tool separately. Then, the blind rivet 40 is prepared, and the shaft portion 41 of the rivet main body 43 is inserted into the shaft support hole 15 provided in the bearing member 12 through the through hole 27 provided in the bracket portion 26 (see FIG. 6). In a state where the blind rivet 40 is inserted into the shaft support hole 15 from the through hole 27, a detachable spacer 47 is disposed between the flange portion 42 of the rivet body 40 and the bracket portion 26 of the flap 4 as shown in FIG. . However, the spacer 47 may be arranged in advance on the end face of the bracket portion 26, and the blind rivet 40 may be inserted from above the spacer 47 to achieve the state shown in FIG. FIG. 8 is a view showing an example of the spacer 47. The spacer 47 is formed of a flat plate having a thickness of about 0.5 mm, and has a slit 48 having a width substantially equal to the diameter of the shaft portion 41 of the rivet body 43. The spacer 47 is inserted into the shaft portion 41 between the flange portion 42 and the bracket portion 26 through the slit 48, so that the flange portion 42 of the rivet main body 43 is lifted from the bracket portion 26 by an amount corresponding to the plate thickness of the spacer 47. And Then, as shown in FIG. 9, the core shaft 44 a of the mandrel 45 protruding from the flange portion 42 of the rivet body 43 is inserted into the mandrel extraction tool 50. The mandrel extraction tool 50 has a holding part 51 that holds the flange part 42 of the rivet body 43 at the tip. The pressing portion 51 has an opening at the center, and introduces the protruding core shaft 44a of the mandrel 45 into the tool. Then, by holding the handle 52 with the pressing portion 51 pressing the flange portion 42 against the spacer 47, the locking means 53 provided inside the tool pulls the core shaft 44 a of the mandrel 45.

  10 to 12 are views showing a process until the blind rivet 40 is fixed by the mandrel pulling tool 50. FIG. When the mandrel pulling tool 50 moves the core shaft 44a of the mandrel 45 protruding from the rivet body 43 in the pulling direction, the head 44b provided at the tip of the mandrel 45 moves the shaft 41 of the rivet body 43 as shown in FIG. The tip end of the shaft portion 41 is expanded and deformed. Accordingly, the shaft portion 41 is brought into pressure contact with the inner surface of the shaft support hole 15, and the rivet body 43 is fixed. Further, when the mandrel extraction tool 50 moves the core shaft 44a of the mandrel 45 in the extraction direction, an excessive force acts on the connecting portion between the core shaft 44a and the head 44b, and the head 44b is separated from the core shaft 44a of the mandrel 45. (See FIG. 11). Then, after the head 44b is separated from the core shaft 44a, if the core shaft 44a of the mandrel 45 is pulled out from the shaft hole 43a of the rivet body 43, the rivet body 43 remains attached to the shaft support hole 15 (FIG. 12). reference). Thereafter, if the spacer 47 is removed, the above-described gap t is formed between the flange portion 42 of the rivet body 43 and the bracket portion 26. By attaching the bracket portions 26, 26 of the flap 4 to both ends of the bearing member 12 as described above, the bracket portions 26, 26 are pivotally supported by the shaft portion 41 through the through holes 27, and the flap 4 is supported by the rivet body 43. The shaft 41 is pivotally pivoted around the shaft 41.

  According to the structure of the flap 4 of the present embodiment, since it is not necessary to perform forced fitting or the like at the time of attachment, careful work is not necessary, and the flap 4 can be attached easily and efficiently. In addition, since a certain gap t is formed between the flange portion 42 of the rivet body 43 and the bracket portion 26 of the flap 4, the flap 4 can be smoothly rotated in the vertical direction. Further, since the rivet main body 43 is not firmly loosened even if the flap 4 is repeatedly rotated, a good pivoted state can be maintained.

  The operation of the flap 4 will be described with reference to FIG. 13. As shown in the solid line from the chain line in the figure, the top plate 3 is covered with the inner lid body 5 covered with the container body 2. When pivoting downward, locking is achieved. That is, the claw 32 provided in the fitting means 13 inside the flap 4 is fitted into the locking rib 17 provided in the fitted means 14 of the container body 2, and the seal packing 9 of the inner lid 5 is attached to the container body 2. The top plate 3 is held in a crowned state while being in close contact with the opening edge. On the other hand, when the flap 4 is rotated upward as shown by the chain line from the state of the solid line in the drawing, the lock is released. That is, since the fitting means 13 of the flap 4 is disengaged from the fitted means 14 of the container body 2, the top plate body 3 can be separated from the container body 2, and the inner lid body 5 can be removed from the container body 2. it can.

  When repeating such a locking operation and unlocking operation, if the fitting means 13 is also made of aluminum as opposed to the fitting means 14 made of aluminum, the toughness or elasticity of aluminum or Due to the poor flexibility, there is a problem that it is difficult to perform smooth mating / unmating operations, and when mating / unmating operations by forcible fitting are repeated, at least one of the mating means and mated means wears out early, making it durable. There is a problem that the sex cannot be satisfied. Therefore, in order to enable a smoother fitting / removing operation, it is preferable that the fitting means 13 provided on the inner side of the flap 4 is made of plastic even when the flap 4 is made of aluminum.

  If the flap 4 is made of aluminum and at least the rivet body 43 of the blind rivet 40 is made of aluminum, almost the entire appearance of the lunch box 1 can be made of aluminum, and the appearance is good.

  In the present embodiment, the mode in which the flap 4 is attached before the bearing member 12 is attached to both sides of the top plate body 3 is illustrated, but the present invention is not limited to this, and is integrated with both sides of the top plate body 3. You may make it attach the flap 4 with respect to the bearing member 12 attached as follows. Even in that case, the attachment procedure is the same as described above.

It is a perspective view which shows the external appearance of one Embodiment of this invention. It is a perspective view showing one embodiment of the present invention in an exploded state. An example of the attachment form of a flap is shown, (a) is a perspective view which shows the state which isolate | separated the flap and the bearing member, (b) is a perspective view which shows the state which connected the flap to the bearing member. It is an expanded sectional view which shows the internal structure of the state in which the flap was attached to the bearing member. It is a figure which shows the state which made the through-hole of a bracket part and the axial support hole of a bearing member correspond in the attachment procedure of a flap. It is a figure which shows the state which inserted the axial part of the rivet main body containing a mandrel in the attachment procedure of the flap from the through-hole to the axial support hole. It is a figure which shows the state which has arrange | positioned the spacer in the attachment procedure of a flap. It is a perspective view which shows an example of a spacer. It is a figure which shows an example of the mandrel drawing process of a blind rivet in the attachment procedure of a flap. It is a figure which shows the state which expanded and deformed the axial part of the rivet main body with the head of the mandrel in the flap attachment procedure. It is a figure which shows the state which the head part of the mandrel isolate | separated from the core shaft in the attachment procedure of a flap. It is a figure which shows the state which pulled out the core axis | shaft of the mandrel from the rivet main body in the attachment procedure of a flap. It is sectional drawing which shows the effect | action of a flap. The prior art is shown, (a) is a perspective view which shows the conventional aluminum lunch box, (b) is a perspective view which shows the conventional plastic lunch box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lunch box 2 Container body 3 Top plate body 4 Flap 12 Bearing member 15 Shaft support hole 26 Bracket part 27 Through hole 40 Blind rivet 41 Shaft part 42 Flange part 43 Rivet body 43a Shaft hole 44a Core shaft 44b Head part 45 Mandrel 47 Spacer t clearance

Claims (2)

It consists of an aluminum container body (2) with an upper opening and an aluminum top plate (3) that is detachably crowned on the top of the container body (2), and is provided on both sides of the top plate. A bracket portion (26) of an aluminum flap (4) that is rotatable in the vertical direction is pivotally connected to the bearing member (12), and a fitting means (13) provided in the flap (4) and a container body ( 2) an aluminum lunchbox comprising constitute fitting means to be freely fitted detachably to each other by a fitting target means (14) provided on both side walls of,
The bearing member (12) is composed of a long aluminum body formed separately from the top plate body (3), and has a shaft support hole (15) constituting a bottomed hole at both ends, and is fixed Fixed to the top plate (3) by means (16) ,
The flap (4) is a flange portion of the rivet body (43) in a state where the through hole (27) formed in the bracket portion (26) is aligned with the shaft support hole (15) of the bearing member (12). (42) is faced to the bracket part (26) and the shaft part (41) of the rivet body (43) is inserted into the shaft support hole (15) ,
The rivet body (43) includes a shaft hole (43a) that penetrates the flange portion (42) and the shaft portion (41), and is separable at the tip of a mandrel (45) inserted through the shaft hole (43a). The tip (41a) of the shaft (41) is expanded and deformed by pulling out the mandrel (45) from a state where the provided head (44b) faces the shaft end of the shaft (41). And a gap (t) having a predetermined dimension corresponding to the thickness of the spacer (47) interposed when the mandrel (45) is pulled out between the flange part (42) and the bracket part (26). The tip (41a) whose diameter has been deformed and deformed is pressure-bonded to the inner surface of the shaft support hole (15), and the separated head (44b) of the mandrel (45) is attached to the shaft support hole (15). An aluminum lunch box that remains inside . It consists of an aluminum container body (2) having an upper opening and an aluminum top plate (3) that is detachably crowned on the top of the container body, and the top plate body is provided on both sides of the top plate body. A bearing member (12) made of a long aluminum body formed separately from the bearing member (12) is fixed to the shaft support hole (15) constituting the bottomed holes provided at both ends of the bearing member (12). On the other hand, the bracket part (26) of the aluminum flap (4) is pivotably pivoted in the vertical direction , and the fitting means (13) provided on the flap (4) and both sides of the container body (2) regarding the aluminum lunchbox comprising constitute fitting means to be freely fitted detachably to each other by a fitting target means (14) provided in the wall, a flap (4) to the bearing member (12) A method of installing,
By using the rivet body (43) provided with the shaft hole (43a) extending from the flange portion (42) and extending along the shaft center, the flange of the rivet body (43) is provided. With the portion (42) facing the bracket portion (26), the shaft portion (41) of the rivet body (43) is inserted through the bracket portion (26) of the flap (4) and the shaft support hole When inserting into (15)
By using a mandrel (45) provided with a separable head (44b) at the tip of the core shaft (44a), the head (44b) of the mandrel (45) is attached to the shaft portion of the rivet body (43) ( The rivet body including the mandrel (45) with the core shaft (44a) of the mandrel (45) inserted into the shaft hole (43a) of the rivet body (43). a step of the shaft portion (41) to insert the shaft into supporting hole (15) in (43),
The use of spacers (47) having a predetermined thickness of the flat plate, detachably temporary the spacer (47) between the flange portion of the rivet body (43) (42) and said bracket section (26) And a process of
The mandrel (45) is moved in the pulling direction from the rivet body (43) in a state where the flange portion (42) is pressed against the spacer (47), and the shaft portion (44b) is moved by the head portion (44b) of the mandrel (45). tip 41) and (41a) inner surface is pressed against fixing of shaft supporting hole (15) by diameter variations, the pulling to separate core shaft of the mandrel (45) and (44a) from the head (44b), Leaving the separated head (44b) in the shaft support hole (15) ;
Thereafter, removing the spacer (47) to form a gap (t) having a predetermined dimension corresponding to the thickness of the spacer (47) between the flange portion (42) and the bracket portion (26); A method of attaching a flap in an aluminum lunch box, comprising:

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