WO2009130757A1 - Backpack - Google Patents

Abstract

A backpack comprising a bag part for accommodating goods, two shoulder belts extending from a superior area of the bag part and two waist belts extending from both sides of an inferior area of the bag part. The two shoulder belts and the two waist belts are coupled with each other The two waist belts are provided with stretch parts. The stretch parts are provided in the region of the waist belts between the inferior area of the bag part and the shoulder belt coupling area. The stretch parts preferably consist of an elastomer capable of stretching substantially only in the direction of extension of the waist belts. Preferably, a flat rubber is used as the elastomer.

Description

rucksack

The present invention relates to a rucksack in which the position of the shoulder belt is difficult to shift when the user carries the back.

A rucksack is a type of bag that people use on their backs. Generally, a rucksack has a storage unit that can store articles, and a shoulder belt that is hung on a user's shoulder.
A user carries a rucksack on his back by hanging a shoulder belt on both shoulders.
Moreover, a user may carry out exercises such as mountain climbing and running while carrying a rucksack.
However, since the backpack of the rucksack is only hung on the shoulder of the user, the storage portion of the rucksack shakes violently when the user exercises. Due to this swinging, the shoulder belt hung on the shoulder is displaced in the vertical and horizontal directions. If the position of the shoulder belt is shifted, a burden is imposed on the user.

In order to reduce such a burden on the user, a rucksack provided with a waist belt is known (Patent Document 1).
This rucksack is used by wrapping a pair of left and right waist-wound belts extending from both sides of the lower portion of the storage portion around the user's waist.
Published Japanese patent application 5-500320

The conventional rucksack can prevent the shoulder belt from being displaced if the waist belt is strongly wound around the user's waist.
However, if the waist belt is tightly wound around the waist in this way, the user's waist is pressed and the feeling of use becomes worse.
On the other hand, if the waist belt is wound weakly around the user's waist, the rucksack is not sufficiently fixed and the shoulder belt is displaced.
To solve this problem, improvements such as increasing the width of the waist belt have been made, but the effect is insufficient.

An object of the present invention is to provide a rucksack that is less likely to be displaced in the position of the shoulder belt when the user carries it on the back and has a good feeling of use.

The rucksack of the present invention includes a storage unit capable of storing articles, two shoulder belts extending from the upper part of the storage unit, and two waist-wrapping belts extended from both sides of the lower part of the storage unit. A backpack in which the shoulder belt and the waist belt are connected to each other, wherein the two waist belts have an elastic part, and the elastic part has a lower part of the storage part and the shoulder belt. It is provided in the area | region between these connection parts.

In the rucksack of the present invention, since the waist belt has a stretchable part, the swinging of the rucksack can be damped when the user is exercising with the rucksack on the back. Therefore, it is difficult for the shoulder belt to be displaced on the shoulder of the user. Such a rucksack also has good usability.

In a preferred aspect of the present invention, the stretchable part is formed of an elastic body that can substantially stretch and contract only in the extending direction of the waist belt.
In another preferred embodiment of the present invention, the elastic body is a flat rubber.

In another preferred aspect of the present invention, the stretchable portion has an elongation rate of 0.03 to 0.07 pulled at a load of 9.81 N in the extending direction of the waist winding belt and has a load in the extending direction of the waist winding belt. The tensile elongation at 19.61 N is 0.12 to 0.37.
However, the elongation rate is obtained by the formula: elongation rate = (AB) / B. In the formula, A represents the length of the stretchable part after being pulled, and B represents the length of the stretchable part before being pulled.

In another preferred aspect of the present invention, the shoulder belt and the waist belt are connected via a harness part having elasticity.

The rear view of one Embodiment of the rucksack of this invention. The same side view. A reference side view when the user carries the backpack. Fig.4 (a) is a principal part expanded side view of one Embodiment of a coupling | bonding assistance tool. FIG.4 (b) is a principal part expanded side view of other embodiment of a coupling assistance tool. Fig.5 (a) is a principal part expanded side view of other embodiment of a coupling | bonding assistance tool. FIG.5 (b) is a principal part expanded side view of other embodiment of the connection part of a shoulder belt. Fig.6 (a) is a principal part expanded side view of one Embodiment of an expansion-contraction part. FIG.6 (b) is a principal part expanded side view of other embodiment of an expansion-contraction part. FIG.6 (c) is a principal part expanded side view of other embodiment of an expansion-contraction part. The principal part expansion side view of other embodiment of an expansion-contraction part. Fig.8 (a) is a principal part expanded side view of the rucksack of an Example. FIG. 8 (b) is an end view taken along the line VIIIb-VIIIb. Fig.9 (a) is a principal part expanded side view of the rucksack of an Example. FIG. 9B is an end view taken along the line IXb-IXb.

Hereinafter, the rucksack of the present invention will be described with reference to the drawings as appropriate. FIG. 1 is a rear view of a rucksack according to an embodiment of the present invention. FIG. 2 is a side view of the same. FIG. 3 is a reference side view of the backpack with the user carrying the backpack.

The rucksack 1 includes a storage portion 2 capable of storing articles, two left and right shoulder belts 3 and 3 extending from the upper portion of the storage portion 2, and left and right extensions extending from both sides of the lower portion 13 of the storage portion 2. Two waist belts 4 and 4 are provided, and the shoulder belt 3 and the waist belt 4 are connected to each other.

For example, the shoulder belt 3 and the waist belt 4 are connected via a harness portion 5.
Further, the waist belt 4 has a stretchable part 6. The stretchable part 6 is provided in the region of the waist belt 4 between the lower part 13 of the storage part 2 and the connecting part 41 of the shoulder belt 3. However, in the present embodiment, the shoulder belt 3 is connected to the waist belt 4 via the harness portion 5. For this reason, the expansion / contraction part 6 is provided in the area | region of the waist belt 4 between the lower part 13 of the accommodating part 2, and the connection part of the harness part 5. FIG.
Hereinafter, it will be described separately for each component.

<Storage section>
The storage portion 2 of the rucksack 1 has an appropriate structure such as a bag shape and can store articles and the like. The storage unit 2 is formed of an appropriate material such as a fiber, resin, or other composite material in a bag shape and has an opening that can be opened and closed. The opening can be opened and closed by a slide fastener 22. Moreover, the storage unit 2 may be divided by providing a partition according to the application.
Furthermore, a backrest portion 23 may be provided on the back surface portion 21 of the storage portion 2. In addition, the back surface part 21 is a part which touches a user's back. The backrest portion 23 is provided in the storage portion 2 by attaching a member (for example, a cushion material) different from the storage portion 2 to the back surface portion 21.

Preferably, the backrest portion 23 is provided on both sides of the back surface portion 21 of the storage portion 2 with a pair of left and right with a certain interval. By providing the pair of left and right backrest portions 23 spaced apart in this way, air permeability can be ensured between the user's back and the back surface portion 21.

The capacity | capacitance of the accommodating part 2 is not specifically limited. The capacity of the storage unit 2 is usually 5 to 40 liters, preferably 5 to 30 liters, and more preferably 8 to 20 liters.
If the capacity | capacitance of the accommodating part 2 is said range, when a user carries the rucksack 1, the shoulder belt 3 will become difficult to slip | deviate.

<Shoulder belt>
Two shoulder straps 3 of the rucksack 1 are extended from the upper part of the storage part 2 at predetermined intervals. The shoulder belt 3 is extended by attaching a member different from the storage portion 2 to the upper portion of the storage portion 2. The shoulder belt 3 may have a seamless structure in which a part of the storage unit 2 is directly extended.

The members constituting the shoulder belt 3 are not particularly limited, but a flexible low rigidity belt is preferable. If a low-rigidity belt is used as the shoulder belt 3, when the rucksack 1 is carried, the sense of unity between the rucksack 1 and the user is improved. Examples of the low-rigidity belt include leather, synthetic leather, natural fiber and / or cloth knitted with synthetic fiber. Among these, as the shoulder belt 3, it is preferable to use a cloth knitted with synthetic fibers.

The shape of the shoulder belt 3 is not particularly limited as long as it has a predetermined width length.
The width of the shoulder belt 3 is preferably 15 mm to 100 mm, more preferably 20 mm to 80 mm, and particularly preferably 30 mm to 70 mm. If the width of the shoulder belt 3 is in the above range, the load applied to the user's shoulder can be dispersed.

In the present embodiment, the left and right shoulder belts 3 and 3 are connected via a connecting belt 31. The connecting belt 31 includes a right belt portion 31a stitched in the middle of the right shoulder belt 3, a coupling portion 31b provided at an end of the right belt portion 31a, and a middle portion of the left shoulder belt 3. It has a left belt portion 31c stitched and a coupled portion 31d provided at an end of the left belt portion 31c.
The left and right shoulder belts 3 and 3 are connected via the connecting belt 31 by fitting the connecting portion 31b and the connected portion 31d. By connecting the left and right shoulder belts 3 and 3 with the connecting belt 31 when the user carries the rucksack 1, the displacement of the shoulder belt 3 can be further prevented.

<Harness part>
The harness portion 5 is a member that connects the shoulder belt 3 and the waist belt 4.
The harness portion 5 includes a long strap portion 51 and a connector 52 for connecting one end side of the strap portion 51 to the lower end of the shoulder belt 3. The other end of the strap portion 51 is connected to the waist belt 4 via a coupling aid 53.

The connecting portion 52 is attached to the lower end of the shoulder belt 3. The strap portion 51 is inserted and locked to the connecting portion 52. By changing the insertion length of the connecting portion 52, the length of the strap portion 51 can be adjusted.

Although the member which comprises the strap part 51 is not specifically limited, A flexible belt is preferable. Examples of the belt include leather, synthetic leather, natural fiber and / or cloth knitted with synthetic fiber, and elastic body having elasticity.
The strap portion 51 is preferably an elastic body having elasticity. Specifically, it is preferable that the strap part 51 is made of an elastic body that is stretchable in whole or in part. Examples of the material of the elastic body include rubber such as natural rubber and synthetic rubber. Examples of the shape of the elastic body include a flat plate shape.

Preferably, the elastic body is made of rubber (flat rubber) formed in a flat plate shape.
If the whole or a part of the strap portion 51 is a flat rubber, when the user carries the rucksack 1, the impact in the left and right direction and the up and down direction applied to the rucksack 1 can be absorbed.
As the flat rubber, there can be used a molded rubber obtained by molding a rubber into a long and thin plate, a cloth-coated rubber obtained by coating a cloth on the outer side of an elongated rubber. The flat rubber is preferably one that stretches most in the longitudinal direction and does not substantially stretch in the width direction.

The above flat rubber preferably has an elongation of 0.1 to 0.3 when pulled in the longitudinal direction with a load of 4.90 N (load of 0.5 kgf). However, the elongation percentage is obtained by the formula: elongation percentage = (AB) / B. In the formula, A represents the length of the flat rubber after being pulled in the longitudinal direction, and B represents the length of the flat rubber before being pulled. In addition, the measuring method of the elongation rate of a flat rubber is according to the method of an Example.

The width of the strap portion 51 is not particularly limited, but is preferably 10 mm to 50 mm, more preferably 15 mm to 40 mm, and particularly preferably 15 mm to 25 mm.
The length of the strap portion 51 is not particularly limited, but is preferably 400 mm to 800 mm, and more preferably 400 mm to 700 mm.

The coupling aid 53 is a member for connecting the other end of the strap portion 51 to the midway portion of the waist belt 4.

The coupling aid 53 is preferably a member that allows the strap portion 51 to rotate in a direction parallel to one surface of the waist belt 4.
As such a coupling aid 53, there is a rotating type coupling aid 531 as shown in FIG. The rotational coupling assisting tool 531 includes a male member 531 a provided in the middle of the waist belt 4 and a female member 531 b connected to the other end of the strap portion 51.

The male member 531 a is provided so as to protrude substantially perpendicular to one surface of the waist belt 4. The male member 531a has a cylindrical shaft portion and a head portion provided above the shaft portion and having a larger diameter than the shaft portion. The female member 531b has a hole having a smaller diameter than the head of the male member 531a. By inserting the hole portion of the female member 531b into the shaft portion of the male member 531a, the female member 531b rotates around the shaft portion.
Accordingly, the strap portion 51 can be rotated in a direction parallel to the one surface of the waist belt 4 (rotation in the direction of arrow X in FIG. 4A).
By using such a rotation type coupling aid 531, when the user carries the rucksack 1, the vertical swing of the rucksack 1 can be attenuated.

In another embodiment, the coupling aid 53 is a member that allows the strap portion 51 to move in a direction parallel to one surface of the waist belt 4 and to rotate in the thickness direction of the waist belt 4. It can also be used.
An example of such a coupling aid 53 is an annular coupling aid 532 as shown in FIG. The annular coupling assisting tool 532 is formed of, for example, a substantially D-shaped ring, and is provided in the middle part of the waist belt 4. The other end of the strap portion 51 is inserted into the ring of the ring-shaped coupling aid 532.
Accordingly, the strap portion 51 can move along the arcuate portion of the ring-shaped coupling aid 532 (moves in the direction of arrow Y in FIG. 4B).
The strap 51 can be rotated around the arcuate portion of the ring-shaped coupling aid 532 (rotated in the direction of arrow Z in FIG. 4B).
By using the ring-shaped coupling aid 532, when the user carries the rucksack 1, the swinging of the rucksack 1 in the vertical direction and the horizontal direction can be attenuated.

Furthermore, in another embodiment, the coupling aid 53 can be a member that allows the strap portion 51 to move in all directions.
As such a coupling aid 53, a ring hook type coupling aid 533 as shown in FIG. The ring hook type coupling aid 533 includes a substantially D-shaped ring portion 533a and a hook portion 533b hung on the ring portion 533a. The ring portion 533 a is provided in the middle portion of the waist belt 4. The hook part 533 b is provided at the other end of the strap part 51. By hooking the hook portion 533b to the ring portion 533a, the hook portion 533b can move in all directions with respect to the ring portion 533a.
Accordingly, the strap portion 51 can move in all directions with respect to the waist belt 4.

Furthermore, in other embodiments, the coupling aid 53 as described above may not be used. That is, as shown in FIG. 5B, the strap portion 51 may be directly connected to the midway portion of the waist belt 4.
Moreover, in other embodiment of this invention, the rucksack 1 in which the said harness part 5 is not provided may be sufficient. That is, the lower end of the shoulder belt 3 may be directly connected to the waist belt 4.

<Waist wound belt>
The waist belt 4 extends from the left and right sides of the lower portion 13 of the storage portion 2. The waist belt 4 is extended in a direction substantially orthogonal to the back surface portion 21 of the storage portion 2.
As shown in FIG. 3, the waist belt 4 is used by being wrapped around the waist of the user. In addition, a stretchable portion 6 is provided in a partial region of the waist belt 4.
The waist belt 4 is extended by attaching members different from the storage unit 2 to both sides of the lower portion 13 of the storage unit 2. Note that the waist belt 4 may have a seamless structure in which a part of the storage unit 2 is directly extended.

The members constituting the waist belt 4 are not particularly limited, but a flexible low rigidity belt is preferable. If a low-rigidity belt is used as the waist winding belt 4, when the rucksack 1 is carried on the back, the unity of the storage unit 2 and the user is improved. As the low-rigidity belt, the same belt as the shoulder belt 3 can be used.

The shape of the waist belt 4 is not particularly limited as long as it has a predetermined width and length.
The width of the waist belt 4 is preferably 50 mm to 200 mm, more preferably 50 mm to 150 mm, and particularly preferably 70 mm to 150 mm.
If the width of the waist belt 4 is in the above range, the width of the stretchable part 6 provided on the waist belt 4 can be increased.
The waist belt 4 is not limited to the case where the width is constant in the extending direction. For example, as shown in FIGS. 1 and 2, the width of the waist belt 4 may be gradually shortened from the lower portion 13 of the storage portion 2 to the tip of the waist belt 4. Further, the width of the waist belt 4 may gradually increase from the lower portion 13 of the storage portion 2 to the tip of the waist belt 4 (not shown).

Furthermore, the left and right waist belts 4 and 4 can be coupled to each other. Specifically, a bifurcated fitting 7 a is provided at the tip of the right waist belt 4. A fitting tool 7b that can be fitted to the fitting tool 7a is provided at the tip of the left waist belt 4. The left and right waist belts 4 and 4 are wound around the waist of the user by fitting the fitting tool 7a and the fitting tool 7b. Reference numeral 8 denotes a belt portion constituting a part of the waist belt 4. The length of the belt portion 8 can be adjusted according to the waist circumference of the user.

<Expandable part>
The expansion / contraction part 6 is provided in a partial region of the waist belt 4 between the lower part 13 of the storage part 2 and the connecting portion 41 (the middle part of the waist belt 4) of the shoulder belt 3.
The stretchable part 6 is composed of an elastic body having stretchability, for example. A stretchable part 6 is provided by incorporating the elastic body into a part of the waist belt 4.

The stretchable portion 6 may be provided in the region between the lower portion 13 of the storage portion 2 and the connecting portion 41 of the shoulder belt 3 in the waist belt 4. Preferably, as shown in FIG. 3, the stretchable part 6 is provided at a position corresponding to the rear part of the trunk side of the user when the waist belt 4 is wound around the waist of the user.

The connection part 41 to which the shoulder belt 3 is connected corresponds to a part to which the connection aid 53 of the harness part 5 is connected.
The position of the connecting portion 41 of the shoulder belt 3 is not particularly limited. The position of the connecting portion 41 of the shoulder belt 3 is preferably closer to the lower portion 13 of the storage portion 2 than the intermediate portion in the extending direction of the waist belt 4. Further, as shown in FIG. 3, the position of the connecting portion 41 of the shoulder belt 3 may be a position corresponding to the trunk side of the user when the waist belt 4 is wound around the waist of the user. More preferred.
For example, the length between the connecting portion 41 of the shoulder belt 3 and the lower portion 13 of the storage portion 2 is preferably 1/5 to 1/2 times the length of the waist belt 4 in the extending direction. More preferably, the ratio is 1/3 to 1/2 times the same.

In one embodiment, as shown in FIG. 6A, the stretchable part 6 is provided in a substantially intermediate region between the lower part 13 of the storage part 2 and the connecting part 41 of the shoulder belt 3.
In another embodiment, as shown in FIG. 6B, the stretchable part 6 may be provided continuously in the lower part 13 of the storage part 2.
Furthermore, in another embodiment, as shown in FIG. 6C, the stretchable part 6 may be provided in substantially the entire area between the lower part 13 of the storage part 2 and the connecting part 41 of the shoulder belt 3. .

Preferably, the stretchable part 6 has substantially stretchability only in the extending direction of the waist belt 4. In the present specification, “substantially stretchable only in the extending direction” means that the stretchable portion 6 slightly stretches in the width direction of the waist belt 4. “Slightly expands and contracts in the width direction” means that the expansion ratio of the expansion / contraction part 6 in the width direction is 1/10 or less of the expansion ratio of the expansion / contraction part 6 in the extending direction. It is 1/20 times or less with respect to the elongation rate in the extending direction. In addition, the width direction of the expansion-contraction part 6 means the direction orthogonal to the extending direction.
However, the elongation percentage of the stretchable part 6 is obtained by the formula: elongation percentage = (AB) / B. A represents the length of the stretchable part 6 after being pulled, and B represents the length of the stretchable part 6 before being pulled.

Preferably, the stretchable portion 6 has an elongation rate of 0.03 to 0.07 when stretched with a load of 9.81 N (load of 1.0 kgf) in the extending direction of the waist belt 4 and the waist belt 4 is extended. The elongation when pulled in the direction with a load of 19.61 N (load of 2.0 kgf) is 0.12 to 0.37.

As the stretchable part 6, an elastic body having sufficient mechanical strength and stretchability that can be stretched at least in the extending direction is used.
An example of such an elastic body is a flat rubber (flat rubber). As the flat rubber, there can be used a molded rubber obtained by molding a rubber into a long and thin plate, a cloth-coated rubber obtained by coating a cloth on the outer side of an elongated rubber.
The flat rubber is preferably one that stretches most in the longitudinal direction and does not substantially stretch in the width direction.

The stretchable part 6 may be composed of one flat rubber or may be composed of a plurality of flat rubbers.
In any case where the stretchable part 6 is composed of one flat rubber or a plurality of flat rubbers, the stretch rate of the stretchable part 6 is preferably designed in the above range. .

Preferably, the stretchable part 6 is composed of a plurality of flat rubbers 61, 62, 63 as shown in FIG. In this case, the plurality of flat rubbers 61, 62, 63 are arranged side by side so that the longitudinal direction thereof is substantially parallel to the extending direction of the waist belt 4. In this way, by arranging the flat rubbers 61, 62, 63 that can substantially expand and contract in the longitudinal direction, the expansion / contraction part 6 that can substantially expand and contract only in the extending direction of the waist belt 4 can be configured.
Preferably, the flat rubbers 61, 62, 63 are arranged in parallel with a slight gap therebetween.

In addition, in FIGS. 1-6, the expansion-contraction part 6 using one flat rubber is shown in figure. 1 to 6 may also be composed of a plurality of flat rubbers.

In the case where the stretchable portion 6 is constituted by a plurality of flat rubbers, each flat rubber (one flat rubber) has an elongation rate of 0.8 when pulled in the longitudinal direction with a load of 4.90 N (load of 0.5 kgf). It is preferably 1 to 0.3.
However, the elongation percentage is obtained by the formula: elongation percentage = (AB) / B. A represents the length of the flat rubber after being pulled in the longitudinal direction, and B represents the length of the flat rubber before being pulled. In addition, the measuring method of the elongation rate of a flat rubber is according to the method of an Example.

When the stretchable portion 6 is constituted by a plurality of flat rubbers, the width of each flat rubber (one flat rubber) is preferably 10 mm to 40 mm, more preferably 15 mm to 40 mm, particularly preferably. Is 20 mm to 35 mm.
When the stretchable portion 6 is constituted by a plurality of flat rubbers, the number of flat rubbers is preferably 2 to 7, more preferably 2 to 5, and particularly preferably 3 to 5 It is a book.

In the rucksack 1 of the present invention, a stretchable part 6 is provided on a part of a waist belt 4. When the user exercises the rucksack 1 on the back, the stretchable part 6 of the waist belt 4 has an effect of attenuating the swinging of the rucksack 1. Therefore, the shoulder belt 3 hung on the user's shoulder is less likely to be displaced in the left-right direction and the up-down direction.
In the rucksack 1 of the present invention, since the shoulder belt 3 is not easily displaced in the left-right direction, the user is less likely to reposition the shoulder belt 3. In the rucksack 1 of the present invention, the shoulder belt 3 is not easily displaced in the vertical direction, so the load on the user's shoulder is reduced. Therefore, the rucksack 1 of the present invention has good usability.

The rucksack 1 of the present invention can prevent the displacement of the shoulder belt 3 without strongly winding the waist belt 4 around the user's waist. Therefore, the rucksack 1 of the present invention does not cause the user to feel cramped when the user carries the backpack.

Hereinafter, examples and comparative examples of the present invention will be described. In addition, this invention is not limited only to the following Example.

(Measurement method of deviation)
The displacement amounts (ΔXpd and ΔZpd) of the shoulder belts of the backpacks of Examples and Comparative Examples were measured by the following method.
Reflective markers were attached to the two shoulder straps of the rucksack. The mounting position of the marker is a position corresponding to the shoulder portion of the user when carrying the rucksack.
Two commercially available 500 ml beverage-containing PET bottles (mass: 540 g) were placed in the storage portion of the rucksack. A man with a standard physique with a height of 184 cm is carrying the rucksack and running on a treadmill (manufactured by TAKEI, product name: NEW ROAD21 Specification, running speed: 12.5 km / h). The amount of displacement of the shoulder belt was measured.
In this measurement, an optical reflection motion capture system (product name: VICON-MX, manufactured by VICON) was used to track the movement position of the reflection marker in three dimensions. From the three-dimensional coordinates of the movement trajectory of the reflective marker, the maximum deviation amount and the minimum deviation amount in the horizontal direction of the shoulder belt, and the maximum deviation amount and the minimum deviation amount in the vertical direction of the shoulder belt were measured. By substituting it into the following equation, the amount of deviation in the horizontal direction (ΔXpd) and the amount of deviation in the vertical direction (ΔZpd) were calculated.

As for the three-dimensional coordinates in the measurement, the left-right direction with respect to the front of the human body is taken as the X coordinate, and the up-down direction with respect to the front of the human body is taken as the Z coordinate.
The amount of deviation (ΔXpd) in the left-right direction was calculated from the difference between the maximum amount of deviation (ΔXmax) of the X coordinate and the minimum amount of deviation (ΔXmin) of the X coordinate. That is, the amount of deviation (ΔXpd) in the left-right direction was obtained from the formula: ΔXpd = ΔXmax−ΔXmin.
The vertical shift amount (ΔZpd) was calculated from the difference between the maximum Z coordinate shift amount (ΔZmax) and the minimum Z coordinate shift amount (ΔZmin). That is, the amount of deviation in the vertical direction (ΔZpd) was obtained from the formula: ΔZpd = ΔZmax−ΔZmin.

(Measurement method of elongation rate of stretchable part)
The elongation percentage of the stretchable part of the backpack of the examples and comparative examples was measured by the following method.
Both ends of the stretchable part provided on the waist belt were attached to a chuck of a tensile tester. Using this tensile tester, the stretchable part was pulled with a load of 9.81 N in the extending direction of the waist belt (however, the pulling speed was 50 mm / min). Similarly, the stretchable part was pulled with a load of 19.61 N.
The length of the stretchable part after being pulled at each load was measured, and the elongation percentage of the stretchable part was determined by substituting it into the following formula.
Formula: Elongation rate = (AB) / B. However, A represents the length of the stretchable part after being pulled, and B represents the length of the stretchable part before being pulled.

(Flat rubber used in Examples and Comparative Examples)
The following three types of flat rubber were used.
The first flat rubber (hereinafter referred to as first flat rubber) is a flat rubber having a width of 25 mm.
The other flat rubber (hereinafter referred to as second flat rubber) is a flat rubber having a width of 126 mm.
The other flat rubber (hereinafter referred to as third flat rubber) is a flat rubber having a width of 36 mm.
The first flat rubber had an elongation of about 0.25 when pulled in the longitudinal direction with a load of 4.90 N, and the elongation was about zero when pulled in the width direction with a load of 4.90 N.
The second flat rubber had an elongation of about 0.03 when pulled in the longitudinal direction with a load of 4.90 N, and an elongation of approximately zero when pulled in the width direction with a load of 4.90 N.
The third flat rubber had an elongation of about 0.12 when pulled in the longitudinal direction with a load of 4.90 N and an elongation of about zero when pulled in the width direction with a load of 4.90 N.

The elongation percentage of each flat rubber was measured by the following method.
Both ends in the longitudinal direction or both ends in the width direction of the flat rubber were attached to a chuck of a tensile tester (distance between chucks of 50 mm in the longitudinal direction). Using this tensile tester, the flat rubber was pulled in the longitudinal direction or the width direction with a load of 4.90 N (however, the pulling speed was 50 mm / min).
The length of the flat rubber before being stretched and the length of the flat rubber after being stretched were measured and substituted into the following formula to determine the elongation of the flat rubber.
Formula: Elongation rate = (AB) / B. A represents the length of the flat rubber after being pulled, and B represents the length of the flat rubber before being pulled.

Example 1
A commercially available rucksack (manufactured by ASICS, product name: EBT128) comprising a storage part (capacity 12 liters), two shoulder belts, and two waist belts was prepared.
Five pieces of the first flat rubber were prepared by cutting the first flat rubber into a length of 30 mm in the longitudinal direction.
A part of the waist belt of the commercially available rucksack was cut. As shown in FIG. 8, five pieces of the first flat rubber were arranged in parallel in the width direction of the waist belt 4 at the cut portion of the waist belt. Each first flat rubber was arranged so that the longitudinal direction of the flat rubber was parallel to the extending direction of the waist belt 4 and joined to the waist belt. In FIG. 8, five first flat rubbers arranged side by side are denoted by reference numerals 6a to 6e.
Further, the strap portion of the commercially available rucksack was removed, and a third flat rubber was attached instead.
Moreover, the coupling | bonding assistance tool of the said commercially available rucksack was removed, and the rotation type | mold coupling assistance tool 531 shown to Fig.4 (a) was attached instead.
Furthermore, the cushion material was removed from the shoulder belt of the commercially available rucksack, and the shoulder belt was made into a low-rigidity belt made of a fabric knitted with synthetic fibers.

With regard to the rucksack of Example 1, the amount of displacement (ΔXpd and ΔZpd) of the shoulder belt was measured according to the above-described method for measuring the amount of displacement. Moreover, the elongation rate (loads 9.81N and 19.61N) of the stretchable part of the same rucksack was measured according to the method for measuring the stretchability of the stretchable part. The results are shown in Table 1.
In addition, the expansion-contraction part is comprised from the 1st flat rubber whose elongation rate of the width direction is substantially zero. Therefore, the stretchable part does not substantially stretch or contract in the width direction.

(Comparative Example 1)
A rucksack according to Comparative Example 1 was produced in the same manner as Example 1 except that the following matters were changed.
Matter different from Example 1: No stretchable part was provided on the waist belt. In other words, regarding the waist belt, no change was made to the commercially available rucksack.
Item 2 different from Example 1: The shoulder belt is a belt in which a cushion material is filled inside a cloth knitted with synthetic fibers. In other words, for the shoulder belt, no change was made to the commercially available rucksack.
For the rucksack of Comparative Example 1, the amount of displacement of the shoulder belt (ΔXpd and ΔZpd) was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 2)
A rucksack according to Comparative Example 2 was produced in the same manner as Example 1 except that the following matters were changed.
Matter different from Example 1: No stretchable part was provided on the waist belt. In other words, regarding the waist belt, no change was made to the commercially available rucksack.
Item 2 different from Example 1: A first flat rubber was attached as a strap portion.
Item 3 different from Example 1: The shoulder belt is a belt in which a cushion material is filled inside a cloth knitted with synthetic fibers. In other words, for the shoulder belt, no change was made to the commercially available rucksack.
-Matter 4 different from Example 1: As a coupling aid, a ring hook type coupling aid 532 shown in FIG. 5A was used.
For the rucksack of Comparative Example 2, the amount of shoulder belt displacement (ΔXpd and ΔZpd) was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 3)
A rucksack according to Comparative Example 3 was produced in the same manner as Example 1 except that the following matters were changed.
Matter different from Example 1: No stretchable part was provided on the waist belt. In other words, regarding the waist belt, no change was made to the commercially available rucksack.
Item 2 different from Example 1: A first flat rubber was attached as a strap portion.
Item 3 different from Example 1: The shoulder belt is a belt in which a cushion material is filled inside a cloth knitted with synthetic fibers. In other words, for the shoulder belt, no change was made to the commercially available rucksack.
Matter 4 different from Example 1: The strap part was directly connected to the waist belt as shown in FIG.
For the rucksack of Comparative Example 3, the amount of displacement of the shoulder belt (ΔXpd and ΔZpd) was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 4)
A rucksack according to Comparative Example 4 was produced in the same manner as Example 1 except that the following matters were changed.
Matter different from Example 1: No stretchable part was provided on the waist belt. In other words, regarding the waist belt, no change was made to the commercially available rucksack.
Item 2 different from Example 1: The strap portion was not changed to flat rubber. That is, about the strap part, the commercial rucksack was not changed.
Item 3 different from Example 1: The shoulder belt is a belt in which a cushion material is filled inside a cloth knitted with synthetic fibers. In other words, for the shoulder belt, no change was made to the commercially available rucksack.
For the rucksack of Comparative Example 4, the amount of displacement of the shoulder belt (ΔXpd and ΔZpd) was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 5)
A rucksack according to Comparative Example 5 was produced in the same manner as Example 1 except that the following matters were changed.
Matter different from Example 1: No stretchable part was provided on the waist belt. In other words, regarding the waist belt, no change was made to the commercially available rucksack.
Item 2 different from Example 1: The strap portion was not changed. That is, about the strap part, the commercial rucksack was not changed.
Item 3 different from Example 1: The shoulder belt is a belt in which a cushion material is filled inside a cloth knitted with synthetic fibers. In other words, for the shoulder belt, no change was made to the commercially available rucksack.
Item 4 different from Example 1: As a coupling aid, a ring hook type coupling aid 532 shown in FIG. 5A was used.
For the rucksack of Comparative Example 5, the amount of displacement of the shoulder belt (ΔXpd and ΔZpd) was measured in the same manner as in Example 1. The results are shown in Table 1.

In the following Examples 2 to 7 and Comparative Examples 6 and 7, the stretchable part was changed variously, and the amount of displacement of the shoulder belt was examined.

(Example 2)
A second commercially available rucksack (manufactured by ASICS, product name: EBT129) having a storage part (capacity 8 liters), two shoulder belts, and two waist belts was prepared.
In addition, two pieces of the first flat rubber cut to a length of 30 mm in the longitudinal direction were prepared.
A part of the waist belt of the second commercially available rucksack was cut. Two pieces of the first flat rubber were juxtaposed in the width direction of the waist belt at the cut portion of the waist belt.
The two first flat rubbers were arranged at reference numerals 6a and 6e shown in FIG. In addition, each first flat rubber was disposed so that the longitudinal direction of the flat rubber was parallel to the extending direction of the waist belt 4 and joined to the waist belt.
Further, the strap portion of the second commercially available rucksack was removed, and a third flat rubber was attached instead.
Moreover, the coupling | bonding assistance tool of the said 2nd commercially available rucksack was removed, and the annular | circular shaped coupling assistance tool 532 shown in FIG.4 (b) was attached instead.
Further, the cushion material was removed from the shoulder belt of the second commercially available rucksack, and the shoulder belt was made to be a low rigidity belt made of a fabric knitted with synthetic fibers.

With respect to the rucksack of Example 2, the amount of deviation (ΔXpd and ΔZpd) of the shoulder belt was measured according to the method for measuring the amount of deviation. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 2.

(Example 3)
Three first flat rubbers cut to a length of 30 mm were prepared, and the three first flat rubbers were the same as in Example 2 except that the three first flat rubbers were arranged at reference numerals 6a, 6c and 6e shown in FIG. Thus, a rucksack according to Example 3 was produced.
For the rucksack of Example 3, the amount of deviation (ΔXpd and ΔZpd) of the shoulder belt was measured according to the method for measuring the amount of deviation. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 2.

Example 4
Five first flat rubbers cut to a length of 30 mm were prepared, and the five first flat rubbers were arranged in the symbols 6a to 6e shown in FIG. A backpack according to Example 4 was produced.
For the rucksack of Example 4, the amount of displacement (ΔXpd and ΔZpd) of the shoulder belt was measured according to the above-described method of measuring the amount of displacement. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 2.

(Comparative Example 6)
A rucksack according to Comparative Example 6 in the same manner as in Example 2 except that the waist-wound belt was not provided with a stretchable part (that is, the waist-wound belt was not changed in the second commercially available rucksack). Was made.
With respect to the rucksack of Comparative Example 6, the shoulder belt displacement amounts (ΔXpd and ΔZpd) were measured according to the above-described displacement amount measurement method. The results are shown in Table 2.

(Example 5)
A commercially available rucksack (manufactured by ASICS, product name: EBT128) comprising a storage part (capacity 12 liters), two shoulder belts, and two waist belts was prepared.
Moreover, one piece of the second flat rubber cut into a longitudinal length of 30 mm was prepared.
A part of the waist belt of the commercially available rucksack was cut. As shown in FIG. 9, the second flat rubber 6 f was joined to the cut portion of the waist belt 4. Further, the second flat rubber 6 f was joined so that the longitudinal direction of the flat rubber was parallel to the extending direction of the waist belt 4.
Further, the strap portion of the commercially available rucksack was removed, and a third flat rubber was attached instead.
In addition, the commercially available back assisting tool 53 of the rucksack was removed, and instead of this, a rotating type connecting assist tool 531 shown in FIG.
Furthermore, the cushion material was removed from the shoulder belt of a commercially available rucksack, and the shoulder belt was made into a low-rigidity belt made of a fabric knitted with synthetic fibers.

With regard to the rucksack of Example 5, the amount of deviation (ΔXpd and ΔZpd) of the shoulder belt was measured according to the above deviation amount measuring method. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 3.

(Example 6)
A rucksack according to Example 6 was produced in the same manner as Example 5 except that the following matters were changed.
Items different from Example 5: Two pieces of the first flat rubber cut into a length of 30 mm in the longitudinal direction were prepared. Two pieces of the first flat rubber were juxtaposed in the width direction of the waist belt at the cut portion of the waist belt. The two first flat rubbers were arranged at reference numerals 6a and 6e shown in FIG. In addition, each first flat rubber was disposed so that the longitudinal direction of the flat rubber was parallel to the extending direction of the waist belt 4 and joined to the waist belt.
For the rucksack of Example 6, the shoulder belt displacement amounts (ΔXpd and ΔZpd) were measured according to the above-described displacement amount measurement method. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 3.

(Example 7)
A rucksack 1 according to Example 7 was produced in the same manner as Example 5 except that the following matters were changed.
Items different from Example 5: Three pieces of the first flat rubber cut into a length of 30 mm in the longitudinal direction were prepared. Three pieces of the first flat rubber were juxtaposed in the width direction of the waist belt at the cut portion of the waist belt. The three first flat rubbers were arranged at reference numerals 6a, 6c and 6e shown in FIG. In addition, each first flat rubber was disposed so that the longitudinal direction of the flat rubber was parallel to the extending direction of the waist belt 4 and joined to the waist belt.
For the rucksack of Example 7, the amount of deviation (ΔXpd and ΔZpd) of the shoulder belt was measured according to the method for measuring the amount of deviation. Further, the elongation percentage of the stretchable part of the rucksack was measured according to the method for measuring the elongation percentage of the stretchable part. The results are shown in Table 3.

(Comparative Example 7)
A backpack according to Comparative Example 7 was produced in the same manner as in Example 5 except that the waist-wrapped belt was not provided with a stretchable portion (that is, the waist-wrapped belt was not changed in the commercially available backpack). .
For the rucksack of Comparative Example 7, the shoulder belt displacement amounts (ΔXpd and ΔZpd) were measured according to the above-described displacement amount measurement method. The results are shown in Table 3.

(Evaluation)
The backpack of Example 1 having the stretchable part on the waist belt had a smaller amount of displacement of the shoulder belt than the backpacks of Comparative Examples 1 to 5 having no stretchable part.
Further, from the results of Examples 2 to 4 and Comparative Example 6, it can be seen that Examples 3 and 4 in which the stretchable part is composed of 3 to 5 flat rubbers are highly effective in suppressing the displacement of the shoulder belt. . Therefore, it can be said that the expansion ratio of the stretchable portion is preferably 0.03 to 0.07 at a load of 9.81 N and 0.12 to 0.37 at a load of 19.6 N.
Further, from the results of Examples 5 to 7 and Comparative Example 7, Example 7 in which the stretchable part is configured by three flat rubbers is more effective than Example 5 in which the stretchable part is configured by one flat rubber. It can be seen that the effect of suppressing the displacement of the shoulder belt is high. Accordingly, it can be said that the stretchable part is preferably composed of a plurality of flat rubbers.

Claims (5)

A storage unit capable of storing articles, two shoulder belts extending from the upper part of the storage unit, and two waist belts extending from both sides of the lower part of the storage unit, A rucksack in which a belt and the waist belt are connected,
The rucksack, wherein the two waist-wrapped belts have an elastic part, and the elastic part is provided in a region between a lower part of the storage part and a connecting part of the shoulder belt. The rucksack according to claim 1, wherein the stretchable part is formed of an elastic body that can substantially stretch and contract only in the extending direction of the waist belt. The rucksack according to claim 2, wherein the elastic body is a flat rubber. The stretchable portion has an elongation rate of 0.03 to 0.07 in the extending direction of the waist winding belt with a load of 9.81 N, and an elongation rate of tensile in the extending direction of the waist winding belt with a load of 19.61 N. The rucksack according to any one of claims 1 to 3, which is 0.12 to 0.37.
However, the elongation percentage is obtained by the formula: elongation percentage = (AB) / B. In the formula, A represents the length of the stretchable part after being pulled, and B represents the length of the stretchable part before being pulled. The rucksack according to any one of claims 1 to 4, wherein the shoulder belt and the waist belt are connected via a stretchable harness portion.

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