JP6693631B1 - Vacuum forming mold and article storage tray formed by the mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum molding die capable of significantly improving workability of assembling work of a movable block for facilitating undercut release. SOLUTION: A rotating shaft 11 for supporting a protruding portion 8 having an inclined surface forming an undercut so as to be tiltable back and forth is arranged at a predetermined position, and between a bottom plate 9 of the protruding portion and a mold bottom cover 12. The elastic body 13 is arranged on the movable block 7 and is rotated by the elastic force of the elastic body to be pushed out from the side wall or the like. [Selection diagram] Fig. 3

Description

The present invention relates to a vacuum forming apparatus for forming a tray made of a vacuum formed body of synthetic resin suitable for accommodating electronic parts, daily necessities, and other articles for storage, transportation, or display, and particularly to a mold for the same. The present invention relates to a vacuum forming die for improving the structure of (1) to form a thin-walled tray that can be stacked in upper and lower stages while maintaining desired strength even in thin-walled molding.

  BACKGROUND ART Deep tray trays are widely used for storing and transporting electronic circuit components and small mechanical components, and such trays are often stacked and handled in multiple stages to improve work efficiency. Therefore, it is customary to form a plurality of overhangs (undercuts) on the outer wall side surface, the inner wall surface side surface, or the partition wall side surface of the tray, which serve as a support for the stacked trays.

Generally, such a tray is formed by processing a plastic plate material by a method such as vacuum forming using a mold. At that time, how to release the undercut part becomes a problem. As a technique for solving this problem, there is a vacuum forming mold of Patent Document 1.

  The technique of Patent Document 1 is configured such that an undercut forming portion includes a movable block, a housing that houses the movable block, a spring arranged on the back surface of the movable block, and a support shaft that rotatably supports the movable block. is doing.

With this configuration, an undercut is formed because the movable block is in a protruding state during vacuum forming, but when the molded product is released from the mold, air blow and pulling force of the molded product (release force). ), The movable block is pulled into the housing, so that the mold can be easily released.

Japanese Patent No. 6254738

  As a result of various studies on the vacuum molding die of Patent Document 1, the present applicant has found that there are the following problems. The first problem is a workability problem when the movable block is incorporated in the mold. That is, in the technique described in Patent Document 1, it is necessary to dispose the spring horizontally at a predetermined position inside the movable block during assembly. However, since the space of the housing is narrow, it is difficult to secure an appropriate means for temporarily fixing or temporarily pressing the spring, which deteriorates the workability of assembly.

In particular, a die provided with a plurality of undercuts has a problem that it takes a lot of time. Further, for maintenance such as cleaning of the housing, it is necessary to disassemble and assemble the undercut forming portion, but this also has a problem that a great deal of labor is required.

Also, depending on the shape of the vacuum molded product, it is necessary to optimize the spring (optimize the spring force), but the spring force is such that when the molded product is released, it can be easily released by the release force. The spring force must be such that the movable block is not drawn into the housing due to vacuum suction during molding.

The spring force varies depending on the shape of the tray (depth, width, etc.), the material used for the tray, the film thickness of the molded product, and the height of the protrusions. It is necessary to select by trial and error, and each time, it is necessary to disassemble and assemble the undercut portion, which requires a lot of labor.

Next, the second problem of the vacuum molding die of Patent Document 1 is that the sidewall has a predetermined thickness in order to embed the undercut forming portion in the cavity of the die sidewall, and The problem is that it will grow. In the mold of Patent Document 1, since the spring is arranged on the back surface of the movable block, a cavity (housing) having a width capable of storing the movable block and laterally arranging the spring is required, including a portion without undercut. However, the thickness of the cavity on the side wall of the mold must be increased. Therefore, there is a problem that the mold becomes large and its weight becomes large.

  Further, although the die of Patent Document 1 is provided with the undercut forming portion only on its side wall, in the case of a large-sized thin wall tray, the strength of the tray cannot be maintained only by undercutting the side wall. Therefore, it is desirable that an undercut can be formed on the partition wall inside the tray. However, there is a problem that the partition wall is thinner than the side wall and cannot be embedded in the partition wall in the undercut forming portion described in Patent Document 1 below.

Therefore, the present invention is directed to a vacuum molding die (hereinafter referred to as a “movable block tilting die”) that moves (moves) the movable block by an elastic force of an elastic body (spring or the like) to facilitate undercut release. ), The arrangement of the elastic body, the mounting structure of the movable block, the shape of the movable block, etc. have been improved to improve the workability of assembling the undercut forming part and to apply it to the side wall and partition wall of the mold. An object of the present invention is to provide a vacuum molding die having a cut forming portion.

  In the movable block tilting mold, the present applicant attaches a support shaft for tiltably supporting the movable block to dispose an elastic body (spring or the like) not only on the back surface of the movable block but also on the bottom surface or the like thereof. , It was conceived that the elastic force of the elastic body (spring etc.) can be converted into the tilting force to the front of the movable block.

Further, if an elastic body (spring or the like) is arranged between the movable block and the bottom surface of the mold, the elastic block (spring or the like) can be installed by assembling the movable block on the elastic body (spring or the like) during assembly. It was conceived that the assembling work can be done without temporarily fixing and temporarily holding the work, and the workability is remarkably improved.

A vacuum forming mold of the present invention based on these ideas is an undercut that serves as a support when stacking the trays in multiple stages on the outer wall side surface and / or the inner wall side surface of a deep dish tray having a partition wall inside. A mold for vacuum forming a tray having:
The undercut forming portion forming the undercut includes a protruding portion protruding from the outer wall side surface and / or the inner wall side surface, a connecting portion extending from a lower end of the protruding portion in a protruding direction of the protruding portion, and the connection. A movable block having a rotating shaft for tilting the protrusion at the end of the portion,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is disposed between the bottom plate of the protrusion and the bottom lid of the mold and presses the bottom plate upward to protrude the protrusion .
The vacuum molding die is characterized in that the center of the rotary shaft is provided at the same position as the tip of the projecting portion that projects, or in the projecting direction further than that.

Further, the vacuum forming mold of the present invention is a support table for stacking trays in multiple stages on the facing surface of a deep tray having a partition wall having facing surfaces facing each other at a predetermined distance. A die for vacuum forming a tray on which an undercut is formed,
The undercut forming portion that forms the undercut includes a protruding portion that protrudes from at least one of the facing surfaces, a connecting portion that extends from a lower end of the protruding portion in a protruding direction of the protruding portion, and the connecting portion. A movable block having a rotating shaft for tilting the protrusion at the end of the portion,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is disposed between the bottom plate of the protrusion and the bottom lid of the mold and presses the bottom plate upward to protrude the protrusion .
The vacuum molding die is characterized in that the center of the rotary shaft is provided at the same position as the tip of the projecting portion that projects, or in the projecting direction further than that.

  In the above-mentioned vacuum molding die, when the object to be molded, which is the tray, is molded, the protrusion is pushed upward by the elastic force of the elastic body, so that the outer wall side surface and / or the inner wall side surface, Alternatively, the elastic body is projected from the facing surfaces of the partition walls facing each other, and when the molded body is released from the mold, the elastic body is compressed by the pressing force generated on the projected portion by the mold release, and the projected portion is pushed into the mold. Be done.

  Further, in the above vacuum molding die, the elastic force of the elastic body is not compressed by the vacuum suction force at the time of molding, but is compressed by the pressing force, and the protrusion is provided in the housing or the cavity. It is the range to be pushed. Further, in the above vacuum molding die, the movable block and the elastic body are detachably mounted in the housing or the cavity.

A vacuum forming mold for a tray having an undercut that serves as a support when stacking the trays in multiple stages, on the outer wall side surface and / or the inner wall side surface of a tray having a partition wall inside,
The undercut forming portion forming the undercut includes a protruding portion protruding from the outer wall side surface and / or the inner wall side surface , a connecting portion 1 extending from a lower end of the protruding portion in a protruding direction of the protruding portion, and A movable block having a rotating shaft for tilting the protruding portion at an end of the connecting portion 1, and a connecting portion 2 extending from the rotating shaft in a rotation direction of the protruding portion ,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is connected to an end of the connecting portion 2 and biases the protrusion of the protrusion,
The vacuum molding die is characterized in that the center of the rotary shaft is provided at the same position as the tip of the projecting portion that projects, or in the projecting direction further than that.

For vacuum forming of a tray in which an undercut is formed on the facing surface of a deep tray having a partition wall having facing surfaces facing each other at a predetermined distance, which serves as a support for stacking trays in multiple stages A mold,
Undercut forming portion that forms the undercut, a projection projecting from one of at least the facing surface, a rotary shaft for tilting the protrusion end portion of the connecting portion 1, the from the rotational axis A movable block having a connecting portion 2 extending in the rotation direction of the protrusion ;
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is connected to an end of the connecting portion 2 and biases the protrusion of the protrusion,
The vacuum molding die is characterized in that the center of the rotary shaft is provided at the same position as the tip of the projecting portion that projects, or in the projecting direction further than that .

In the above vacuum forming mold, when the molded body that is the tray is molded, the projecting portion projects from the facing surface of the partition wall by the elastic force of the elastic body, and when the molded body is released from the mold. The elastic body is pulled by the pressing force generated on the projecting portion by the mold release, and the projecting portion is pushed into the mold.

  Further, in the above vacuum molding die, the elastic body is not pulled by the vacuum suction force at the time of molding, but is pulled by the pressing force, and the front protruding portion is pushed into the housing or the cavity portion. Is. Further, in the above-mentioned vacuum molding die, the movable block and the elastic body are detachably mounted in the housing or the cavity.

  According to the present invention, it becomes possible to dispose the elastic body between the bottom plate of the protrusion and the bottom surface of the mold in the vacuum molding mold. As a result, the labor of assembling the movable block is significantly reduced. Further, the undercut forming portion could be attached even in a place where the hollow portion has no thickness such as a thin outer wall or a partition wall. As a result, it is possible to provide a small vacuum molding die with undercut formation, and it is possible to manufacture a large-sized thin-walled tray that can be stacked in multiple layers in the vertical direction while maintaining the desired strength even for large-sized thin-walled trays. It became possible.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings of the embodiments. FIG. 1 is a perspective view showing the shape of a vacuum molding die that is a first embodiment of the present invention. As shown in FIG. 1, the mold 1 has an outer wall 3 formed on a bottom plate 2, and the inside of the mold 1 is divided into small compartments by a partition wall 4 for storing articles.

An undercut forming portion 5 is provided outside the outer wall 3. The undercut forming portions 5 are provided on the left, right, front and rear sides of the outer wall 3, three on each side and a total of 12 undercuts. In this mold, each of the bottom plate 2, the outer wall 3 and the partition wall 4 is a hollow body having a hollow inside, and is made by cutting metal or the like.

The tray molded by this mold is used for the purpose of storing various kinds of small parts such as electric circuit chips by classifying them and has a large number of partition walls. The tray undercuts are all provided on the outer wall.

In some cases, the number of partition walls of the tray may be relatively small depending on the components to be stored, and the undercut forming portion 5 may not be provided outside the outer wall 3 but may be provided inside the outer wall 3 or on the side surface of the partition wall 4. The article storage section may be completely partitioned by the partition wall 4 as shown in FIG. 1, but a partition (opening between adjacent component storage sections) is provided in a part thereof and has a facing surface facing each other. Good as a wall. It may be a partition wall that partitions the parts and the like of the article storage unit so as not to move to other parts storage units due to impact or the like.

FIG. 2 is a view showing the shape of a mold in which the undercut forming portion 5 is provided on the inner side of the outer wall 3 and the side surface of the partition wall 4. The shape of the undercut and the shape and structure of the mold of the undercut forming portion may be the same, or the shape and structure may be changed.

3A and 3B are views showing the structure of the undercut forming portion of the mold 1, where FIG. 3A is an external perspective view thereof, FIG. 3B is a front view thereof, and FIG. 3C is a side view thereof. FIG. 3D is a sectional view taken along line AA of FIG. In these figures, the bottom plate 2 and the outer wall 3 of the mold 1 are long and continuous to the left and right, but for convenience of illustration, a part of them is cut and shown by a dashed line (described later). The same applies to the figure).

As shown in FIG. 3A, the outer wall 3 is provided with an opening 6, and the movable block 7 is housed in a cavity inside thereof. As shown in FIG. 3D, the movable block 7 has a protruding portion 8 that forms an undercut on one side surface (opening side) thereof, and the protruding portion 8 is erected on the bottom plate 9. Has become.

The main body portion 14 includes a protruding portion 8 and a bottom plate 9, and a connecting portion 10 connecting the rotating shaft 11 and the bottom plate 9 extends from an end portion of the bottom plate 9 and projects from the center of the rotating shaft 11 at a predetermined radius. The part 8 is configured to rotate counterclockwise in FIG. The rotating shaft 11 is supported by bearings (neither of which is shown) formed on both sides of a housing or a pair of partition walls provided inside the outer wall 3 and the bottom plate 2, and the protrusion 8 is in the normal direction thereof. It is supported so that it can be tilted back and forth along. Further, a spring 13 as an elastic body is vertically arranged between the semi-cylindrical recess 15 (see FIG. 4B) formed on the back side of the bottom plate 9 and the bottom lid 12 of the mold.

The point of the configuration of the present invention is that the rotary shaft 11 is arranged away from the central axis of the spring 13 in the projecting direction of the projecting portion 8. As a result, the upward force (indicated by the arrow X in FIG. 3D) due to the elastic force of the spring 13 becomes a rotational force about the rotating shaft 11, and the pushing force of the protrusion 8 (indicated by the arrow Y). ) Will act as.

As described above, even if the spring 13 is arranged not under the back surface of the movable block 7 but under the bottom surface (bottom plate) of the projecting portion, the same effect as when it is provided on the back surface is obtained. There are two characteristics.

On the other hand, when the molded product is released from the mold, the protrusion 8 is pushed into the cavity of the outer wall 3 so that the upper portion of the protrusion 8 recedes close to the surface of the outer wall 3. Since the movable block 7 is rotated clockwise by the rotation shaft 11, the bottom plate 9 of the movable block 7 is also pushed down, and the movable block 7 is in a state of being inclined slightly downward to the right. Corresponding to this, the spring 13 is also compressed. At that time, a semi-cylindrical recess 15 is formed on the back side of the bottom plate 9 like a wall surrounding the spring 13 on the lower surface of the bottom plate 9 so as to prevent the spring 13 from being slanted. is doing.

  Here, in the first embodiment, the coil spring (spring 13) is used as the elastic body, but instead of this, any type of elastic body such as cylindrical rubber or air spring may be used. Further, the arrangement of the spring 13 is not limited to the arrangement of the bottom surface of the movable block 7. In short, the elastic force of the elastic body causes a rotational force about the rotary shaft 11 to act on the projecting portion 8, and the projecting portion 8 projects from the outer wall side surface, the inner wall side surface, and the partition wall of the mold 1 during vacuum molding. When the molded body is released from the mold, the protrusion 8 is pushed into the mold by the pressing force generated on the protrusion 8 by the mold release. The elastic body may be arranged in such a structure that such elastic force acts.

4A and 4B are views showing the shape of the movable block 7 used in this embodiment. FIG. 4A is a perspective view of the movable block 7 in an upright state, and FIG. 4B is an inverted state of the movable block 7. It is a perspective view of a state. As shown in FIG. 4A, the movable block 7 is formed by integrally molding the projecting portion 8, the bottom plate 9, the connecting portion 10, the rotating shaft 11, and the main body portion 14, and the boundaries between them are not clear. ..

As shown in FIG. 4B, a semi-cylindrical recess 15 is formed on the back side (upper side in the figure) of the bottom plate 9, and the spring 13 can be fitted therein. The recess 15 not only has an effect of preventing the spring 13 from being displaced when the mold is released, but is also useful as a means for temporarily fixing the spring when assembling the movable block, thereby improving the work efficiency of the assembly work. Further improvement can be expected.

Next, a procedure for assembling the undercut forming portion in the vacuum molding die of this embodiment will be described. 5A and 5B are explanatory views of the assembling work of the undercut forming portion, FIG. 5A is an exploded view showing the arrangement of parts, and FIG. 5B is a perspective view showing the condition of the die bottom surface after assembly. is there.

In this embodiment, the undercut forming portion is assembled from the bottom of the mold. That is, a bottom lid 12 and a bottom lid opening 16 which is an opening thereof are formed on the lower surface of the bottom plate 2 of the undercut forming portion, and bearings are provided on both side walls of a housing formed inside the bottom plate 2 and the outer wall 3 (shown in the figure). Is not formed).

The assembling worker first fits the rotary shaft 11 of the movable block into the bearing of the housing, and then sets the spring 13 inside the recess 15 of the movable block. Next, the bottom lid 12 is fixed to the lower surface of the bottom lid 12 by screwing. As a result, the assembling work of the undercut forming portion is completed, and the bottom surface of the mold is in a state as shown in FIG. 5 (b).

In this work procedure, the time required for assembling one undercut forming portion is about 1 to 2 minutes, and even if there are 12 undercuts as shown in FIG. 1, the total working time is 10 minutes to Since it can be suppressed to about 15 minutes, it can be said that the work efficiency can be remarkably improved as compared with the method of Patent Document 1.

FIG. 6 is a perspective view showing the shape of the vacuum molding die according to the second embodiment of the present invention. As shown in FIG. 6, the mold 1a has an outer wall 3 formed on a bottom plate 2, and inside of the mold 1a, a partition wall 4 divides a component storage portion into small compartments. The difference between the mold 1a shown in FIG. 6 and the mold 1 shown in FIG. 1 lies in the undercut forming portion provided on the partition wall 4.

The outer wall 3 of the mold 1a is provided with an undercut forming portion 5 similar to the mold 1. An undercut forming portion 5a different from the undercut forming portion 5 of the outer wall 3 is provided on the partition wall 4 in the longitudinal direction of the mold 1a. The mold 1a has four pieces on each of the two left and right sides of the outer wall 3, a total of eight pieces, and one piece on each of the four opposing surfaces 40 of the partition wall 4 having a defect (opening) portion in the middle part, a total of four pieces. , A total of 12 undercut forming portions are provided.

The difference between the undercut forming portion 5 and the undercut forming portion 5a will be described later, but the bottom plate 2, the outer wall 3 and the partition wall 4 of the mold 1a are all hollow hollow bodies, and are formed by cutting metal. It is created by etc. The thickness of the partition wall 4 is as thin as about 1/3 of the thickness of the outer wall 3, and the projecting portions 8a are housed inside the partition wall 4 and provided so as to project from the facing surfaces.

  FIG. 7 is an exploded structural view of an undercut forming portion 5a provided on the facing surface of the partition wall 4 of the vacuum molding die according to the second embodiment of the present invention. The left side of FIG. 7A is a perspective view showing the shape of the movable block 7a, and the right side of FIG. 7A is a perspective view in which the movable block 7a is arranged so as to face each other. As shown in FIG. 7A, the difference between the movable block 7 used for the mold 1 and the movable block 7a lies in the thickness and shape of the protrusions standing on the bottom plate 9. That is, with respect to the protrusion 8 of the movable block 7, the thickness of the protrusion 8a is thinner than that of the protrusion 8 and the shape thereof is formed in a fan shape having a central angle of about 90 degrees. By forming the protrusions in a thin fan shape, even the thin partition wall 4 can accommodate the protrusions 8a therein and can be tilted. It should be noted that the movable block 7a is integrally formed by the protruding portion 8a, the bottom plate 9, the front connecting portion 10, the rotating shaft 11, and the main body portion 14, and the arrangement of the elastic body is the same as that of the movable block 7.

  As shown in FIG. 7B, a semi-cylindrical recess 15 is formed on the back side (upper side in the figure) of the bottom plate 9, and the spring 13 can be fitted therein. The recess 15 not only has an effect of preventing the spring 13 from being displaced when the mold is released, but is also useful as a means for temporarily fixing the spring when assembling the movable block, thereby improving the work efficiency of the assembly work. There is no difference from the movable block 7 in that further improvement can be expected.

FIG. 7C is an exploded view showing the arrangement of the components of the undercut forming portion, and FIG. 7D is a perspective view showing the condition of the bottom surface of the mold after assembly. The rotary shaft 11 of the movable block 7a is fitted to a bearing (not shown) of the housing. The spring 13 is set inside the semi-cylindrical recess 15 of the movable block. The spring 13 and the movable block 7a can be replaced / cleaned by attaching / detaching the bottom cover 12 with the screws of the bottom cover 12. When the bottom lid 12 is screwed, the bottom surface of the mold becomes a state as shown in FIG. 7 (d).

  FIG. 8 is a view showing the structure of the undercut forming portion 5a of the mold 1a according to the second embodiment of the present invention. FIG. 8A is a perspective view of the protruding portion 8a protruding from the partition wall 4 during vacuum forming, FIG. 8B is a plan view thereof, and FIG. It is an AA sectional view shown in b). As shown in FIG. 8, the thickness of the protruding portion 8a is smaller than the wall thickness of the partition wall 4, and is formed so as to be able to be stored in the wall. At the time of vacuum forming, an upward force is applied to the bottom plate 9 by the spring 13 so that the projection 8a projects from the inside of the partition wall 4 to the outside of the facing surface.

FIG. 8D is a perspective view showing a state where the movable block 7a is housed inside the partition wall 4 at the time of mold release, and FIG. 8E is a plan view thereof, and FIG. FIG. 9C is a sectional view taken along line CC of FIG. At the time of releasing, the spring 13 is compressed as shown in FIG. 8F by the pressing force generated on the protruding portion 8a by the releasing, and the protruding portion 8a is pushed into the partition wall 4 and stored in the partition wall 4.

9 and 10 have the same basic structure as that of the undercut forming portion 5b provided on the partition wall 4 of the mold 1a shown in FIGS. The difference is that the movable block provided has a common rotation axis.

  As shown in FIGS. 9A and 9B, the bearing 19 is formed with a length that is about ½ of the width of the bottom plate 9 of the movable block 7b. The bearings 19 of the movable blocks 7b facing each other are formed asymmetrically, the central axes thereof are aligned, and the rotary shaft 11 is inserted there to form a common shaft. The undercut forming portion provided with such a common rotating shaft is suitable when the interval between the facing surfaces 40 of the partition walls facing each other is narrow.

A semi-cylindrical recess 15 is formed on the back side (upper side in the drawing) of the bottom plate 9, an exploded view of the components of the undercut forming portion of FIG. 9 (c), and the assembled metal of FIG. 9 (d). The perspective view showing the situation of the bottom surface of the mold is the same as the description in FIGS. 7C and 7D.

  FIG. 10: is a figure which shows the structure of the metal mold | die 1a provided with the undercut formation part 5b. 10A is a perspective view showing a state in which the protruding portion 8a projects from the partition wall 4 during vacuum forming, FIG. 10B is a plan view thereof, and FIG. 10C is FIG. It is an AA sectional view of (b). 10D is a perspective view showing a state where the movable block 7a is housed inside the partition wall 4 at the time of mold release, FIG. 8E is a plan view thereof, and FIG. 8) is a cross-sectional view taken along line CC of FIG. The description is the same as the description of FIGS. 8A to 8F, but the rotating shaft 11a is a common shaft, and the facing interval of the partition wall 4 cut in the middle is narrow. Differences in points.

  In FIG. 11, a part of the partition wall 4 is broken in the middle part thereof, half of the thickness remains as the remaining partition wall 4a, and the facing surfaces 40 of the facing defective parts are formed with a predetermined distance. It is the figure which showed the structure of the metal mold | die 1a in which the undercut formation part 5c was formed in one side of 40. 11 (a) is a perspective view thereof, FIG. 11 (b) is a side view, FIG. 11 (c) is a sectional view, and FIG. 11 (d) is a BB sectional view of FIG. 11 (b). .. Although the basic structure is the same as that of the undercut forming part 5 described above, this is an example suitable for forming a tray in which the partition wall is left and the partition is left in the adjacent storage part because the storage parts are small. The protruding portion 8b tilts along the remaining partition wall 4a. During vacuum forming, it abuts on the opposing partition wall, and at the time of mold release, it is pushed into the partition wall by the pressing force of the mold release.

  FIG. 12 is a diagram showing the structure of a mold 1a in which the partition wall 4 is broken in the middle portion thereof, and an undercut forming portion 5d having the thickness width of the partition wall 4 is provided on one side of the facing surface 40 of the cut portions facing each other. Is. 12 (a) is a perspective view thereof, FIG. 12 (b) is a side view, FIG. 8 (c) is a sectional view, and FIG. 8 (d) is a DD sectional view. The basic structure is the same as that of the undercut forming portion 5 described above, but as shown in FIG. 12, the facing surface 40 (defective surface) of the partition wall 4 is formed into a projection shape (for example, a fan shape having a central angle of 90 degrees). The projection 8c is configured to be tilted in this space when cut out. Such a configuration is a preferred embodiment when the partition wall is thin and the protrusion cannot be housed inside the partition 4 or the protrusion cannot be installed along the remaining partition.

  FIG. 13 is a diagram showing the relationship between the movable block, the rotating shaft, and the urging force of the movable block by the elastic body. In the above-described embodiment, a spring is used as the elastic body, and the spring is arranged between the semi-cylindrical concave portion 15 (bottom plate of the protruding portion) on the back side of the bottom plate 9 and the bottom lid of the mold, and the urging force of the spring is set. By providing the rotation center of the rotary shaft in the direction that is the same as the tip position of the protruding portion that protrudes by, or in a direction that protrudes more than that, the protruding portion is tilted.

  However, the tilting of the movable block is not limited to this. For example, as shown in FIGS. 13A and 13B, the rotary shaft 11 is provided in front of the tilting direction of the movable block, and the spring 13 ( The projecting portion 8a may be projected by the tensile force of the tension spring 13). Alternatively, as shown in FIGS. 13C and 13D, the connecting member 20 may be extended below the rotating shaft and a tensile force may be applied in a direction opposite to the direction in which the projecting portion 8a is projected.

  The application of the biasing force is not limited to the spring. For example, rubber having a cylindrical shape which is an elastic body may be used. Further, a rubber cord, a rubber band, or the like may be used as the elastic body that gives a tensile force. Further, it may be an elastic body made of air spring, plastic, or metal.

FIG. 14 is a perspective view showing a state in which the undercuts provided on the partition wall when the trays 100 formed by the vacuum forming mold 1a are vertically stacked are in contact with the bottom plate of the upper tray. On the outer wall 300 of the tray, four undercuts 500 are formed on the left and right sides, for a total of eight undercuts. The bottom plate of the upper tray 100 contacts the undercut 500 of the lower tray to maintain the strength of the undercut thin tray 100 provided on the outer wall.

15A is a plan view, FIG. 15B is a front view, FIG. 15C is a side view, and FIG. 15D is FIG. 15A when the trays 100 are vertically stacked. 3 is a sectional view taken along line AA of FIG. By contacting the bottom plate of the upper tray 100 with the undercut 500 of the lower tray, the undercut 500 provided on the outer wall and the undercut 500 provided on the partition wall maintain the strength of the thin tray 100. ..

  According to the storage tray having the above-mentioned configuration, the upper and lower storage trays are kept constant by bringing the lower undercut protrusions into contact with the bottom plate of the upper tray in a state where the storage trays are stacked in the same direction. It is possible to stack while maintaining the interval. By forming a convex part that is convex inward on the lower side surface of the undercut part provided on the outer wall, the convex part of the upper part comes into contact with the protruding part of the lower cut part of the lower part, which enables more stable stacking of trays. Become.

Further, since the undercut protrusions of the partition wall come into contact with the bottom plate of the upper tray, the trays can be stacked in multiple stages without bending even if the tray is thin. By providing undercuts on the outer wall and partition wall, both the outer frame and the partition wall are reinforced, making it difficult to open to the outside, and even if a large impact is applied to the stacked storage trays, the outer frame opens to the outside. It becomes difficult to cause deformation such as being lost.

It is a perspective view which shows the shape of the metal mold | die for vacuum forming which is 1st Example of this invention. It is a perspective view which shows the shape of the metal mold | die for vacuum forming which is another Example of this invention. It is a figure which shows the structure of the undercut formation part in the vacuum die of 1st Example. It is a figure which shows the shape of the movable block used in the 1st Example. It is explanatory drawing of the assembly operation of an undercut formation part. It is a perspective view which shows the shape of the metal mold | die for vacuum forming which is the 2nd Example of this invention. It is a disassembled structural drawing of the undercut formation part 5a provided in the partition wall 4 of the vacuum molding die which is the 2nd Example of this invention. It is a figure which shows the structure of the undercut formation part 5a provided with the movable block 7a in the metal mold | die 1a of a 2nd Example. It is a figure which shows the structure of the undercut formation part 5b provided in the partition wall 4 of the metal mold | die 1a of a 2nd Example. It is a figure which shows the structure of the metal mold | die 1a provided with the undercut formation part 5b. Half of the thickness of the partition wall 4 remains in the middle portion as the remaining partition wall 4a, and the facing surfaces 40 of the defective portions facing each other are formed with a predetermined distance, and the undercut forming portion 5c is formed on one side of the facing surface 40. It is the figure which showed the structure of the metal mold | die 1a. It is the figure which showed the structure of the metal mold | die 1a in which the partition wall 4 was cut | disconnected by the intermediate part and the undercut formation part was provided in the width | variety of the partition wall 4 on one side of the opposing surface. It is a figure showing the relation between the protrusion, the rotation axis, and the urging force of the movable block by the elastic body. FIG. 6 is a perspective view showing a state in which an undercut provided on a partition wall when the trays 100 formed by the vacuum forming mold 1a are stacked vertically is in contact with the bottom plate of the upper tray. It is the top view, the front view, the side view, and sectional drawing at the time of stacking the tray 100 up and down.

1, 1a: Mold 2: Bottom plate 3: Outer wall 4: Partition wall 5: Undercut forming part 6: Outer wall opening part 7: Movable block 8: Projection part 9: Bottom plates 10, 18, 20: Connecting member 11: Rotating shaft 12: Bottom lid 13: Spring 14: Main body 15: Semi-cylindrical recess 16: Bottom lid opening 19: Bearing 40: Opposing surface 100: Tray 300: Outer wall 500: Undercut

Claims (12)

A vacuum forming mold for a tray having an undercut that serves as a support when stacking the trays in multiple stages, on the outer wall side surface and / or the inner wall side surface of a tray having a partition wall inside,
The undercut forming portion forming the undercut includes a protruding portion protruding from the outer wall side surface and / or the inner wall side surface, a connecting portion extending from a lower end of the protruding portion in a protruding direction of the protruding portion, and the connection. A movable block having a rotating shaft for tilting the protrusion at the end of the portion,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is disposed between the bottom plate of the protrusion and the bottom lid of the mold and presses the bottom plate upward to protrude the protrusion .
The vacuum molding die, wherein the center of the rotating shaft is provided at the same position as the tip of the projecting portion projecting or in the projecting direction more than that . For vacuum forming of a tray in which an undercut is formed on the facing surface of a deep tray which has a partition wall having facing surfaces facing each other at a predetermined distance, and which serves as a support for stacking trays in multiple stages. A mold,
The undercut forming portion that forms the undercut includes a protruding portion that protrudes from at least one of the facing surfaces, a connecting portion that extends from a lower end of the protruding portion in a protruding direction of the protruding portion, and the connecting portion. A movable block having a rotating shaft for tilting the protrusion at the end of the portion,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is disposed between the bottom plate of the protrusion and the bottom lid of the mold and presses the bottom plate upward to protrude the protrusion .
The vacuum molding die, wherein the center of the rotating shaft is provided at the same position as the tip of the projecting portion projecting or in the projecting direction more than that . At the time of molding the molded object that is the tray, the projecting portion is pushed upward by the elastic force of the elastic body and projects from the outer wall side surface and / or the inner wall side surface, and when the molded object is released from the mold, The vacuum molding die according to claim 1, wherein the elastic body is compressed by the pressing force generated on the protrusion by the mold, and the protrusion is pushed into the mold. Type. At the time of molding the molded object that is the tray, the projecting portion is pushed upward by the elastic force of the elastic body and projects from the facing surface, and when the molded object is released from the mold, the projecting portion is released by the mold release. The vacuum molding mold according to claim 2, wherein the elastic body is compressed by the generated pressing force, and the protrusion is pushed into the mold. 2. The elastic force of the elastic body is in a range that is not compressed by a vacuum suction force at the time of molding but is compressed by the pressing force and the protrusion is pushed into the housing or the cavity. 5. The vacuum molding die according to any one of 1 to 4. The vacuum molding die according to any one of claims 1 to 5, wherein the movable block and the elastic body are detachably attached by opening and closing the bottom plate . A vacuum forming mold for a tray having an undercut that serves as a support when stacking the trays in multiple stages, on the outer wall side surface and / or the inner wall side surface of a tray having a partition wall inside,
The undercut forming portion forming the undercut includes a protruding portion protruding from the outer wall side surface and / or the inner wall side surface , a connecting portion 1 extending from a lower end of the protruding portion in a protruding direction of the protruding portion, and A movable block having a rotating shaft for tilting the protruding portion at an end of the connecting portion 1, and a connecting portion 2 extending from the rotating shaft in a rotation direction of the protruding portion ,
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is connected to an end of the connecting portion 2 and biases the protrusion of the protrusion,
The vacuum molding die, wherein the center of the rotating shaft is provided at the same position as the tip of the projecting portion projecting or in the projecting direction more than that . For vacuum forming of a tray in which an undercut is formed on the facing surface of a deep tray having a partition wall having facing surfaces facing each other at a predetermined distance, which serves as a support for stacking trays in multiple stages A mold,
Undercut forming portion that forms the undercut, a projection projecting from one of at least the facing surface, a rotary shaft for tilting the protrusion end portion of the connecting portion 1, the from the rotational axis A movable block having a connecting portion 2 extending in the rotation direction of the protrusion ;
A housing or a cavity having a bearing that accommodates the movable block inside a mold and supports the rotating shaft ;
An elastic body that is connected to an end of the connecting portion 2 and biases the protrusion of the protrusion,
The vacuum molding die, wherein the center of the rotating shaft is provided at the same position as the tip of the projecting portion projecting or in the projecting direction more than that. At the time of molding the molded object that is the tray, the projecting portion projects from the outer wall side surface and / or the inner wall side surface by the elastic force of the elastic body, and when the molded object is released, the projecting portion is released by release. The mold for vacuum forming according to claim 7, wherein the elastic body is pulled by a pressing force generated on the mold, and the protrusion is pushed into the mold. At the time of molding the molded object which is the tray, the projecting portion projects from the facing surface by the elastic force of the elastic body, and at the time of releasing the molded object, due to the pressing force generated on the projecting portion by the mold release, The vacuum molding die according to claim 8, wherein the elastic body is pulled and the protrusion is pushed into the inside of the die. 8. The elastic force of the elastic body is not pulled by the vacuum suction force at the time of molding, but is within a range in which the protrusion is pushed by the pressing force and is pushed into the housing or the cavity. 11. The vacuum forming mold according to any one of 1 to 10. 12. The vacuum forming mold according to claim 7, wherein the movable block and the elastic body are detachably attached by opening and closing the bottom plate .

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