JPS6013369Y2 - thermal lunch box - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat-retaining lunch box, and more specifically, to an improvement in the method of connecting the shoulder member from which the inner case hangs down and the upper end of the outer case in the heat-retaining lunch box.

Conventionally, in this type of heat-retaining lunch box, the methods for connecting the shoulder member and the upper end of the outer case include (a) forming an annular inward flange at the upper end of the approximately square cylindrical synthetic resin outer case; At the same time, a vertically elongated hole is bored in the center of the upper part of the long diameter side wall of the outer case, and a substantially ring-shaped synthetic resin support member with the upper surface of the board in contact with the lower surface of the flange of the outer case has a board. In addition to erecting one boss at each of the four corners of the top surface, a hanging wall is hung from the outer peripheral edge of the board, and two bosses are placed horizontally on each hanging piece hanging from the long diameter side facing each other. ing.

This support member is inserted from below the outer case, and the horizontal bosses of the support member are engaged with the longitudinal holes of the outer case, thereby supporting the support member at two points.

The upper surface of the substrate of the supporting member is brought into contact with the lower surface of the flange of the outer case, and each boss on the upper surface of the substrate is positioned slightly inward from the flange.

In the above state, a shoulder member having guide holes for screw tapping is placed at positions corresponding to the bosses at the four corners of the support member, and screws are tapped from the guide holes to each boss of the support member, It is known that a shoulder member is connected to an exterior case, an outer cover that closes the opening of the shoulder member is locked to the horizontal boss of the support member, and a mounting bracket for attaching a hanging cord is tapped with screws. It is being

However, according to this, the supporting member is supported at two points by engaging the horizontal boss of the supporting member in the vertically elongated hole of the outer case, and the upper surface of the substrate of the supporting member is in contact with the lower surface of the flange. Therefore, when screwing the shoulder member to the exterior case from above via the support member, the support member flexes to both sides around the mounting bracket for attaching the top cover and attaching the suspension string. Not only is the tightening workability of the
There was a risk that cracks or damage would occur in the support member itself.

(b) Although not shown, concave portions are formed at the four corners of the flange of the exterior case, and convex portions are provided protrudingly at positions corresponding to the concave portions at the four corners of the shoulder member. There has also been provided one in which a convex part is connected to a concave part of a flange part, and a screw is tightened from above at the center of these fitting parts.

In this case, the screws are directly fastened to the flange of the outer case without providing a supporting member as in (a) above, so the above-mentioned disadvantages are solved.

However, even with this configuration (b), when the flange is formed integrally with the outer case, the molding method must be used.

In this case, new difficulties arise as described below.

That is, blow molding has the advantage that the outer case can be easily hollow-molded, but has the disadvantage that the thickness of the molded product becomes uneven.

Therefore, when the flange of the outer case is thin, the threaded portion formed on the flange is also thin and may become loose.

In order to prevent this screw from becoming loose, it is necessary to increase the amount of molding material for the flange portion during blow molding, which has the disadvantage of increasing costs by the extra molding material.

This idea is based on the engagement hole formed in the upper end of the outer case.
The engaging member is integrally locked from the lower part of the flange of the outer case,
The flange of the exterior case is sandwiched between the engaging member and the shoulder member, and the shoulder member is screwed to the engaging member to solve the inconveniences and difficulties of the conventional products. The main purpose is

A first embodiment of this invention will be described below with reference to FIGS. 1 to 5.

1 is a container body of a thermal lunch box, and the container body 1 is:
A shoulder member that hangs an outer case 2 made of synthetic resin and blow-molded into a substantially rectangular cylinder shape with a bottom and rounded corners, and an inner case 4 that stores an inner container 3 such as a soup container 3a and a rice bowl 3b in a manner that can be freely entered and removed. 5, and a vacuum double layer 6 disposed between the outer case 2 and the inner case 4.

The inner case 4 has an annular shoulder member 5 that defines the upper opening of the inner case 4 and is placed on the flange 7 at the upper end of the outer case 2 and fixed with screws, and Two left and right storage chambers are formed with a central partition wall 8 which is erected slightly unevenly to the right.

In other words, the left half of the drawing is a cylindrical storage chamber 9 with a bottom.
This is a heat-retaining water bottle in which the soup container 3a and the rice bowl 3b are stored in a manner that they can be freely accessed and removed, and the right half of the container is a storage chamber 10 with a bottom and a cross-sectional shape, and the chamber 10 is equipped with a vacuum double layer 11. 3c, an accessory case 3d for storing small items such as a paring knife, and a chopsticks case 3e, each of which can be freely accessed and removed.

The accessory case 3d is made of synthetic resin and consists of a pair of half containers divided into two in the vertical direction, and the joining part of the half containers is a thin resin hinge part, so that both half containers can be opened and closed to the left and right. It is integrally molded so that

Engagement holes 12 each having a square cross section are formed at four corners of the inward facing flange 7 provided around the upper end of the exterior case 2 and at two opposing locations on the sides of the front and rear center cutting line. An engaging member 13 consisting of an independent small piece is press-fitted into each engaging hole 12 from below the collar portion 7.

The engaging member 13 has a step 14 at its lower portion to prevent removal, and a square column portion 16 erected above the step 14 which is sized to fit into the engagement hole 12. death,
A plurality of small protrusions 15 or annular protrusions are protruded from the outer periphery of this square column part 16.

When this engaging member 13 is press-fitted from below into the engaging hole 12, the small protrusion 15 is elastically deformed and is locked onto the upper surface of the engaging hole 12 as shown in FIG. At the same time, the square column part 16 of the engagement member 13 is fitted into the square engagement hole 12, and the securing member 13 prevents rotation due to joint force when tightening the screw described later. .

In the embodiment, since the retaining member 13 is composed of an independent small piece having a size to be locked in each of the engaging holes 12, the work of assembling the engaging member 13 into the flange portion 7 is easy.

On the other hand, an inward step 7b is formed on the upper outer periphery of the flange 7 of the exterior case 2, and the bent portion 5b of the outer periphery of the shoulder member 5 is fitted into the step 7b. The shoulder member 5 and the shoulder member 13 are held in place by the step 14 that prevents the engagement member 13 from being pulled out, and the shoulder member 5 is held at six positions from above. A screw 17 is fastened to the square column portion 16 of the mating member 13.

Therefore, in this case, the flange 7 is not screwed, and the step 14 that prevents the retaining member 13 from being pulled out reinforces the lower surface of the flange 7, making it strong in terms of strength. Even if the outer case 2 is made thin by blow molding, there will be no problem.

Note that 18 is a vegetable container placed on the shoulder member 5 and the central partition wall 8 of the inner case 4, and the vegetable container 18 is designed to accommodate a seasoning container 19.

20 is an outer lid that closes the upper opening of the inner case 4; 21 is a handle pivotably mounted on the upper part of the outer case 2; 22;
are latches for locking the outer cover 20, and the latches 22 are fixed at symmetrical positions on the front and rear of the outer case 2.

23 is a bottle holder made of a cushioning material such as styrofoam that holds the bottom of the vacuum double bottle 6 and protects the same amount of chips; 43
is a chip cover.

In the embodiment, a vacuum double bottle 6 is installed between the outer case 2 and the inner case 4, but it may be filled with a heat insulating material such as urethane foam to a required thickness to have a heat insulating effect.

FIG. 6 shows another modified example of the engaging member 13 and the flange 7 of the outer case 2 to which the engaging member 13 is attached, and this one includes a pair of adjacent engaging holes 12, 12. In order to lock the engaging members 13 and 132 at the same time, a curved substrate 44 having a substantially arc shape that follows the shape of the flange 7 of the outer case 2 is provided.
, and 132 engaging members 13, 132 each having a small protrusion 15 and a cylindrical portion 16 are erected near both ends of the curved substrate 44, and the other configurations are almost the same as those of the previous embodiment. be.

FIGS. 7 and 8 show a second embodiment, in which outward hooks 24 and 25 made of flexible thin steel plate, plastic, etc. are provided on both sides of the base plate of the retaining member 13a. In addition, a hole 26 for fastening a screw is provided in the center of the board between both hook parts 24 and 25, and an engaging hole 27 and a screw hole 28 are provided in the four corners of the flange part 7 of the exterior case 2, respectively. The hook portion 24 of the engaging member 13 is inserted into the engaging hole 27 of the collar portion 7, and the hook portion 2
5 on the upper surface of the tip edge of the collar 7 respectively.
A is fitted between both hook portions 24 and 25 of the engaging member 13a, and screws 17 are fastened to the screw holes 28 and 26 from above the shoulder member 5.

FIG. 9 shows a third embodiment, in which the retaining member 13b has a bush portion 29 facing upward and a hub portion 30 facing sideways, and two engaging members 13b are prepared. Then, the hub portion 30 is engaged with the engagement hole 31 formed at a mutually symmetrical position on the upper side wall of the exterior case 2, and the hub portion 30 is
The shaft end of the handle 21 is inserted into the hub hole 32 of the outer case 2, and the bushing portion 29 is inserted into the insertion hole 3 of the outer case 2.
It is inserted into 3.

In the figure, the shoulder member 5 is the part that is fixed with the screw 17.
A convex portion 5a is formed on the flange 7, and a recess 7a is formed on the flange 7 so that the concave and convex portions fit together, so that the concave and convex portions also serve as positioning.

Note that the exposed portion of the hub portion 30 of the engaging member 13b may be caulked, or the tip of the hub portion 30 may be formed of an elastic material to form the engaging hole 31.
Force it into place.

Reference numeral 34 denotes a member for preventing the shaft end of the handle 21 from being pulled out.

According to this configuration, the mounting portion of the handle 21 is reinforced by the vertical portion of the retaining member 13b and the hub portion 30 in addition to the side wall of the outer case 2, so that the pivot portion of the handle 21 is strengthened. has advantages.

In addition to the structure of this embodiment, the four corners of the exterior case 2 can also be secured with screws in the same manner as in the first embodiment.

FIG. 10 and FIG. 11 show a fourth embodiment, in which a pair of outer lid latching/hanging string fasteners 35 are attached to the upper side wall of the outer case 2. Engagement holes 37 and 38 are formed in the plate 36 and the side wall of the outer case 2, respectively, and the slotted cylinder 39 protruding from the outside of the engagement member 13c is inserted into the engagement holes 37 and 38, and the cylinder is closed. Stop the tip of the body 39 and metal 35
While caulking the mounting plate 36 of the engaging member 13c, the recess 4 of the engaging member 13c
The protrusion 41 at the lower part of the flange 7 of the outer case 2 is fitted into the 0, and the protrusion 5a of the shoulder member 5 is fitted into the recess 42 at the upper part of the flange 7, and these three are screwed together. It is what it is.

In addition to the structure of this embodiment, screws can also be secured to the four corners of the exterior case 2 as in the first embodiment, and in this case, the number of screws must be secured at six locations.

Further, although the engaging member 13c in this embodiment is associated with the outer lid latching fitting 35, the cylindrical body 39 of this engaging member 13c may also be provided in association with the handle 21 as in the third embodiment. can.

According to this invention having the above configuration, the flange 7 of the exterior case 2 is sandwiched between the engaging members 13.13a, 13b, 13c and the shoulder member 5, and the tip of the screw 17 is Since it is configured to be fixed to the engaging member, even if the flange 7 of the outer case is blow molded and has a thin wall, or even if the container body is large, the retaining member will reinforce the screwed part. As a result of not being separated, it can be securely fixed.

In addition, since the engaging members 13a, 13b, 13c are locked in the engaging holes 12, 27, 31.37 of the exterior case 2 from below the collar portion 7 and do not come off, they cannot be removed from above the shoulder member 5. Even when tapping the screw 17, the engaging member and shoulder member do not bend.

Therefore, the efficiency of screw fastening work is improved, and cracks and damage to the shoulder member and the engagement member itself due to deflection of the engagement member, etc., are prevented.

Note that if the retaining member is an independent small piece of a size that should be locked in each engagement hole of the outer case 2, it will be easier to apply it to the flange 7 of the outer case 2 from below. This is convenient and saves material costs compared to the case where the base plate of the engaging member is provided all around the circumference.

[Brief explanation of the drawing]

The figures all show an embodiment of this invention; Fig. 1 is a plan view with the lid open, Fig. 2 is a vertical sectional view, and Fig. 3 is a side view showing a cross section with a part of Fig. 2 cut away. Figure 4 is an exploded perspective view of the main parts.
Figure 5 is a cross-sectional view of the main part, Figure 6 is an exploded perspective view of the main part, Figure 7 is an exploded perspective view of the main part, Figure 8 is a cross-sectional view of the assembled state of Figure 7, and Figure 9 is the main part. Cross-sectional view, Figure 10 is a cross-sectional view of main parts, 1st
FIG. 1 is a perspective view of the engaging member in FIG. 10. 1...Container body, 2...Exterior case,
3...Inner container, 4...Inner case, 5.
...Shoulder member, 7...Brim part, 12---
--Engagement holes, 13, 13a, 13b, 13c...
・Engagement member, 17... screw, 24, 25...
...Hook part, 27.31.37.38...Engagement hole.

Claims (2)

[Scope of utility model registration request] (1) A shoulder member equipped with an inner case for removably storing an inner container such as a soup container or rice bowl is connected to the upper end of the outer case, and a vacuum pipe is installed between the inner case and the outer case. In a heat-retaining lunch box that is provided with a heavy bottle or a heat insulating material and uses these as the main body of the container, an engaging hole is bored in the inward flange formed at the upper end of the outer case, and a hole is formed in the lower part of the flange in the engaging hole. What is claimed is: 1. A heat-retaining lunch box characterized in that, while an engaging member is locked, a flange of an exterior case is sandwiched between the engaging member and a shoulder member, and the shoulder member is screwed to the engaging member. (2) The heat-retaining lunch box according to claim 1, wherein the engaging member is formed of an independent small piece having a size to be locked in each of the engaging holes of the outer case.