JP3274556B2 - Buffer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion which fits on the outside of an article to protect the article from external impact.

[0002]

2. Description of the Related Art In general, a cushion made of a foamed resin molded product is used for packing electrical products and replacement parts of OA equipment. These buffers are used by fitting to the end of the packaged object, and at the same time as fixing the packaged item in the individual box,
This protects the packaged object from external impact such as dropping or collision.

FIG. 3 shows an example of a conventional buffer. In the figure, 1 'is a buffer, 2 is a holder, 3 is a buffer, and 5 is a packaged object. As shown in FIG. 3, the buffer 1 ′ normally fits in the package 5 and holds the buffer 1 ′ to the package 5. It has a shock absorber 3 that absorbs shock by compressing or breaking itself and reduces the shock transmitted to the holder 2. In this drawing, the buffer 3 is provided only in the Z direction,
The buffer section 3 is appropriately formed at a site requiring a buffering capacity.

FIG. 4 shows a portion around the buffer section 3 of the buffer body 1 'as X.
The figure seen from the -Z plane is shown. The arrow C in the figure is the falling direction in which the buffer unit 3 shows the buffering capacity. Normally, as shown in FIG. 4, the buffer section 3 is formed such that its cross section in a direction perpendicular to the holding section 2 becomes trapezoidal. Since the buffer portion 3 protrudes from the holding portion 2, it is easily broken at a root portion thereof, and this is prevented by making the bottom surface wide.

[0005] When designing the buffer 1 ', the buffer thickness T and the pressure receiving area A of the buffer section 3 are calculated based on the required buffer capacity. The buffer thickness T is the height T of the buffer section 3 shown in FIG.
The pressure receiving area A is a cross-sectional area in a direction parallel to the holding unit 2. As described above, the buffer section 3 has a trapezoidal vertical section,
The pressure receiving area A is a cross-sectional area of just half the height. These T and A are calculated from the following formula based on the weight of the packaged object (W), the drop height (H), and the allowable G value (G).

A = W × G / σ T = C × H / G where C is a constant specific to the material of the buffer.

For example, when the weight of the packaged object is 2.4 kg, the drop height is 60 cm, the allowable G value is 30, the material constant of the buffer is C = 2.7, and σ = 3, the pressure receiving area A is 24 cm ^2. ,
The buffer thickness T is 5.4 cm.

[0008]

From the above equation, it can be seen that to increase the buffering capacity, it is sufficient to reduce the cross-sectional area of the buffering portion and to make the buffering portion thick and elongated.

However, actually, a buffer having various buffer portions is formed and its buffering capacity (G value relating to a packaged object) is formed.
When measured, the buffer capacity as designed may not be obtained. This is because as the shape of the shock absorber becomes thinner and longer, the shock absorber bends at impact and escapes from compression (buckling).
As a result, the impact is transmitted to the packaged object without performing the predetermined compression. In particular, when the falling direction is a corner or a ridge that is inclined with respect to the buffer, the buckling is more easily performed.

Further, even when no impact is applied, the weight of the packaged object is applied to the buffer located at the lower part of the packaged product, so that the buffering portion is creep-deformed, and a predetermined buffer is applied at the time of impact. You will not be able to demonstrate your ability.

When the packaged object is heavy, it is possible to prevent the deformation and buckling of the buffered portion by making the buffer portion thicker within the range of the required buffering capacity. A buffer part without buckling cannot provide a sufficient buffer capacity.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a cushioning member having a high buffering capacity without deformation or buckling of the cushioning portion even when the packaged product is light.

[0013]

SUMMARY OF THE INVENTION The present invention is directed to a buffer having a holding portion fitted to a package to hold the package and a buffer protruding from the holder. At least one end of the portion has a support portion extending left and right around the buffer end and projecting obliquely from the holding portion so that a cross section in a direction parallel to the holding portion is substantially T-shaped. A buffer body characterized in that: The present invention, as described above,
It is intended for protection of lightweight packaged items, and is specifically used suitably for packaged items of 3 kg or less, preferably 1 kg or less.

[0014]

FIG. 1 shows an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a buffer according to the present invention, which has a holding section 2, a buffer section 3, and a support section 4. FIG. 2A is a diagram of the periphery of the buffer unit 3 according to the present embodiment as viewed from the XZ plane. FIG. 2B is a sectional view taken along the line AA ′ in FIG.

In the present invention, the buffer section 3 is conventionally
It is characterized in that T and A are set on the basis of the above-mentioned formula, and furthermore, a support 4 for supporting the buffer 3 is provided at one end of the buffer 3. The support portion 4 according to the present invention extends right and left around the end of the buffer portion 3 and has a substantially T-shaped cross section (FIG. 2B). At the same time, the support part 4 projects obliquely from the holding part 2.

In the present invention, since the support portion 4 exists at the end of the buffer portion 3, the buffer portion 3 cannot be bent.
Therefore, the conventional buckling is prevented. In addition, this support 4
Since the protruding portion is inclined and protrudes from the holding portion 2, it is not compressed like the buffer portion 3 when it receives an impact and falls down to the buffer portion 3 side. That is, since the pressure receiving area A does not have a buffering action, the pressure receiving area A is only a portion indicated by oblique lines in FIG. 2B, and the provision of the support portion 4 does not require the buffer portion 3 to be thin. Therefore, in the conventional thin or long buffer,
It is possible to reliably obtain the designed buffering capacity that cannot be obtained due to buckling or the like.

In the present invention, the inclination angle of the support 4 is
The thickness of the support 4 is t ₁ , and the displacement of the support 4 in the X direction is t.
Assuming that ₂ , it is desirable that t ₂ = _{2 to} 5t ₁ . The angle of inclination of the support 4, that is, the angle between the support 4 and the holder 2 is 90
When the angle is close to °, a buffering action is exhibited, and the pressure receiving area of the buffer section 3 must be reduced accordingly. On the other hand, if the inclination angle is small, the support portion 4 that has fallen becomes an obstacle and the compression of the buffer portion 3 is hindered.

In the present embodiment, the support 2 is partially parallel to the Z direction at the end of the support 4 opposite to the holding 2, but this is because This is because it becomes a sliding part, and there is no problem even if the inclined surface is extended.

Although the AA 'cross section is not exactly an average of the cross sectional area of the buffer portion 3 for that reason, the parallel portion is actually very short and substantially negligible.

The buffer portion 3 and the support portion 4 according to the present invention can be formed in necessary portions in appropriate directions in addition to the embodiment shown in FIG. Further, it may be used in combination with the buffer section 3 having no support section 4.

As the material of the buffer of the present invention, exactly the same material as the conventional buffer can be used. For example, expanded polyethylene, expanded polypropylene, and expanded polystyrene can be suitably used. Further, the respective buffer portions 3 and the support portions 4 may be separately formed of the same material or different materials and then bonded and fused to the holding portion 2 or may be integrally formed.

The results of measuring the buffer capacity of the present invention by a drop test are shown below.

The front and rear surfaces are each 149.4 mm × 85.
8 mm, a depth of 203 mm, and a weight of 2.85 kg are packed with the shock absorbers of the example and the comparative example, and a drop height =
The G value at the time of falling was measured with 106.7 cm and the target allowable G value = 30 or less. Size after packing is 340m
mx 277 mm x 394 mm.

FIG. 5 shows a state in which the cushioning material of this embodiment is packed in an article to be packaged, and FIG. 6 shows a comparative example. In the present embodiment, a support portion that fits from both left and right sides of the packaged object and supports a buffer portion provided on the top and bottom surfaces and a support portion that supports the buffer portion provided on the front surface are continuous. In the present embodiment, t ₁ shown in FIG. 2A was set to 10 mm, and a value obtained by changing the value of t ₂ was prepared (〜). The height of the buffer is 75mm
It is. On the other hand, the comparative example is a shock absorber that conventionally packs the packaged object, and the packaged object is fitted from the front and rear direction. The height of each buffer is 75 mm.

In the drop test, first, the same package is subjected to a corner formed by the front, left side and bottom, a ridge formed by the front and left sides, a front
It was dropped in the order of the ridge formed by the bottom and the ridge formed by the left side and the bottom. As a result, in Examples and Comparative Examples, good results were obtained without any damage to the packaged items. Next, the same package is dropped continuously in the order of front, rear, top, and bottom,
G at the time of fall by the sensor attached to the package inside
The value was measured. The results are shown in the following table. still,'~'
Is a result when the same package is dropped on the surface without the drop test of the corner and the ridge.

[0026]

[Table 1]

As is evident from Table 1, all the examples exhibited low G values on average. Conventionally, when the buffer portion is formed with the pressure receiving area of the present embodiment, the buffer portion buckles and does not exhibit a predetermined buffering capacity. ADVANTAGE OF THE INVENTION According to this invention, even if it is a buffer part with a small pressure receiving area, buffer capacity can be fully drawn out.

In the comparative example, since the buffer came off the package during the drop test, the buffer was fixed to the package with an adhesive tape. Such a phenomenon was not observed in the examples. This is because, when the cushioning part on the top surface is crushed by the impact at the time of dropping, it falls down inward (toward the rear surface in the cushioning part on the top surface of the cushion fitted from the front), and the cushioning body is covered. This is because force acts in the direction of removing the package. The shock absorber of the embodiment does not fall down inward due to the support portion. Therefore, the force always acts in the outward direction, that is, the direction in which the buffer is pressed against the article to be packaged, and there is no fear that the buffer will come off without fixing the buffer to the article to be packaged.

[0029]

As described above, according to the present invention, by combining the cushioning portion of the conventional cushioning body with the support portion having a very simple structure, a high-capacity product which has not been obtained conventionally in a lightweight packaged object is obtained. A buffer capacity can be obtained, and breakage in transportation, transshipment, and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a buffer according to the present invention.

FIG. 2 is a partial explanatory view of the embodiment of the present invention shown in FIG.

FIG. 3 is a perspective view of an example of a conventional buffer.

FIG. 4 is a partial explanatory view of the conventional example shown in FIG. 3;

FIG. 5 is a diagram showing an embodiment of the present invention.

FIG. 6 is a diagram showing a comparative example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Buffer 2 Holder 3 Buffer 4 Supporter 5 Package

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-228274 (JP, A) JP-A-7-895875 (JP, A) Actually open Showa 55-117974 (JP, U) Actually open flat 2- 56175 (JP, U) Patent 3228628 (JP, B2) JP 46-26473 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 81/113

Claims (1)

(57) [Claims] 1. A buffer having a holding portion fitted to a package and holding the package, and a buffer protruding from the holder, wherein the buffer is provided at least at one end of the buffer. A buffer body having a support portion extending right and left around the end portion of the buffer portion so as to have a substantially T-shaped cross section in a direction parallel to the portion and projecting obliquely from the holding portion.