JP2009005965A - Fire hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire hose, which can be developed to make a desired form of the hose as a whole smoothly in a short time specifically from the state where it is wound in a doubly coiled form or the like at a fire site or the like requiring urgent need. <P>SOLUTION: The fire hose 1 comprises a jacket 2 provided with a lining 3 of rubber or synthetic resin. The center W of gravity exists with deviation in one direction on the outer circumferential side on a cross sectional surface that is perpendicular to the length of the hose 1. As parted in half along a parting line through the center of the hose perpendicularly in one direction on the outer circumferential side where the center W of gravity exists, weight ratio constitution is set to make weight on the side with the center of gravity:weight on the side without it=1.03-1.3:1. Hose thickness T is set uniform along the whole circumference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fire hose.

  Conventionally, a fire hose is usually configured by uniformly coating rubber or synthetic resin as a lining on a jacket formed by being woven, knitted or wound evenly throughout.

  Fire hoses are usually coiled in a compact and flat state when stored, and when used, they are released and stretched so that they can roll on the road or on the floor. used. In this extension, the shape of the entire hose is taken into consideration so as not to hinder the smooth flow of high-pressure water during water discharge.

  For example, when the hose should be used as long as possible, it is required to exhibit a straight hose state without being meandering, zigzag, or twisted, or the hose is straight. When the hose is to be used in a relaxed state with a surplus length, the surplus part does not become a zigzag shape or twists, and it becomes a gentle arc or arcuate curve. The operator of the hose in an emergency etc. operates while paying attention to the optimal shape of the hose while determining the fire point position (and thus the water discharge position). Is required.

  However, a fire hose that is originally uniformly woven and uniformly coated with rubber or synthetic resin does not have a specific direction in the radial direction of the hose, and performs a constant stretching operation as described above. Even when trying to do it, there are situations where people who are not usually handled handle it, and there are situations where it is necessary to do it with a small number of people, etc., and it was not necessarily easy in a short time in an emergency.

  In connection with such a point, there are some proposals for improving the stretchability of the fire hose (Patent Documents 1-3).

  For example, a coating layer made of rubber or synthetic resin is provided on the inner surface of a jacket made of a tubular woven fabric, and a pair of thick portions and a pair of thin portions that extend the coating layer in parallel to the longitudinal direction of the hose are hose. There has been proposed a fire hose arranged alternately in the circumferential direction, and configured such that the pair of thick portions and the pair of thin portions face each other across the hose shaft core. (Patent Document 1).

  However, in the hose proposed in Patent Document 1, the presence of the thick part causes an increase in the winding diameter when the coil is wound, and there are problems such as storage and operability, and the strength of the thin part.

  In addition, as a fire hose that can be quickly and straightly extended from a coiled state without hindering entrainment and storage, the inner surface of a tubular woven jacket is made of rubber or synthetic resin. A hard layer that extends parallel to the hose longitudinal direction and a soft layer that is less rigid than the hard layer are arranged alternately in the hose circumferential direction, and the hose cross-section is pushed flatly There has been a proposal for a fire hose in which a hard layer is positioned at a flat part and a soft layer is positioned at both bent parts when crushed (Patent Document 2).

  However, in the hose proposed in Patent Document 2, the presence of a hard layer and a soft layer having a lower rigidity than the hard layer causes problems such as inhomogeneity and strength.

  In addition, when the hose is stretched from the storage state, it is easy to stretch and the stretchability of the stretched hose is straightened, and when water is passed through the stretched hose, As a fire hose that can improve the speed of communication, the so-called water permeability, for fire fighting, a lining layer made of rubber or synthetic resin is fitted to the inner surface of a jacket made of warp and weft. In the hose, a fire-fighting unit is provided with an expansion promoting portion that applies weight in the direction of expansion when the hose is expanded between the ears, which are both side ends when the hose is folded flat. A hose has been proposed (Patent Document 3).

However, the hose expansion promoting portion proposed in Patent Document 3 is, for example, a portion woven using a thick thread, but the expansion promoting portion locally becomes a thick wall portion and is coiled. In addition, the winding diameter was increased, and there were problems such as storage and operability.
JP 2000-140415 A JP 2000-146032 A JP 2001-141127 A

  In view of the above-described points, the object of the present invention is to provide a desired overall hose shape in a short time when a fire hose wound in a coil shape is extended in an emergency fire site or the like. It is to provide a fire hose that can be deployed.

  In particular, when the hose is not straight and should be used with the hose length remaining slack, the surplus amount does not become zigzag or twisted or twisted. It is an object of the present invention to provide a fire hose capable of relatively easily presenting two arcs or arcuate curves.

  In particular, even from a coiled double-wound state as shown in FIGS. 2, 4, and 6, the desired overall hose shape can be made more quickly, easier to operate, and easier. It is to provide a fire hose that can be extended.

The fire hose of the present invention that achieves the above-described object has the following configuration (1).
(1) In a fire hose in which a jacket of rubber or synthetic resin is applied to the jacket, the center of gravity is present in a biased direction in the outer peripheral side on a cross section perpendicular to the longitudinal direction of the hose, and the center of gravity Is divided into two by a dividing line passing through the center of the hose at right angles to the outer peripheral side in one direction (weight on the side with the center of gravity: weight on the side without the center of gravity = 1.03 to 1.3). A fire hose having a weight ratio of 1) and having a uniform hose thickness around the entire circumference.

Moreover, in the fire hose of this invention, as a more preferable specific structure, it is either of the following (2)-(10).
(2) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is other than the weight in the region of 10% to 30% of the entire circumference of the hose in the cross section. The fire hose according to (1), wherein the fire hose is formed so as to be heavier than the portion.
(3) The jacket outer periphery has a single vertical color line provided along the longitudinal direction of the hose, and the vertical color line indicates the outer periphery in which the center of gravity is present in a biased direction on the outer peripheral side. The fire hose according to (1) or (2), wherein the fire hose is present on a line in one side direction.
(4) The outer periphery of the jacket has a single vertical color line provided along the longitudinal direction of the hose, and the vertical color line is the outer periphery in which the center of gravity exists in one direction on the outer peripheral side. The fire hose according to (1) or (2), wherein the fire hose is present on a line perpendicular to one side direction.
(5) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is a part of the entire circumference of the hose in the cross section. The hose length is formed near the boundary between the region where the weight is formed heavier than the other part and the other part on the outer periphery of the jacket. The fire hose according to any one of (1) to (4), wherein a boundary color line extending along the direction is provided.
(6) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is configured such that the jacket is made of woven fabric, and the woven yarn density of the woven fabric is The fire hose according to any one of (1) to (5) above, wherein the fire hose is formed by being partially changed along the circumferential direction.
(7) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is such that the specific gravity of rubber or synthetic resin lining the jacket is along the circumferential direction of the hose. The fire hose according to any one of (1) to (5) above, which is formed by being partially changed.
(8) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is such that the rubber or synthetic resin layer lining the jacket is on the inner surface of the hose. The ribs are formed by having a plurality of ribs having a rib height of 0.3 to 2 mm extending in the hose length direction, and the pitch of the ribs being partially changed along the hose circumferential direction. The fire hose according to any one of (1) to (5) above, wherein
(9) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is the structure in which the jacket is impregnated with synthetic resin at the outer periphery and covered with the synthetic resin Any one of the above (1) to (5), wherein the synthetic resin impregnation coating amount is partially changed along the hose circumferential direction Fire hose described in 1.
(10) On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is formed by two or more combined structures selected from the above (5) to (9) The fire hose according to any one of (1) to (9) above, wherein

  According to the present invention, when a fire hose wound in a coil shape is expanded in an emergency fire site, it is possible to present the desired entire hose shape in a short time and smoothly. A fire hose is provided.

  In particular, according to the present invention, when the hose is not straight and is to be used in a loose state where the hose length is excessive, the excessive amount becomes a zigzag shape or twists. Thus, there is provided a fire hose capable of relatively easily presenting one gentle arc shape or arcuate curve shape quickly.

  Among them, in particular, even from the state of being housed in a coiled double winding as shown in FIGS. 2, 4 and 6, the desired hose overall shape can be quickly and more easily operated, It is possible to provide a fire hose that can be more easily extended.

  The fire hose of the present invention having such an effect is easy to handle in that it can be extended in a desired form even to operators who are not familiar with fire hose or operators who are not familiar with fire hose. Therefore, it is possible to respond to urgent serious matters more quickly and accurately.

  In addition to actual use at the fire site, when the fire hose of the present invention is employed in a fire fighting competition, etc., the fire hose with stable expandability that contributes to establishment as a standard operation of the hose operator Is to provide. In particular, in such fire fighting competitions, the operator of the acting team can change the right-handed or left-handed, by changing the double winding method and the mounting of the male and female brackets. A new fire hose that provides better operability and expandability for both right-handed and left-handed persons is provided.

  Hereinafter, the fire hose of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a fire hose according to the present invention. A fire hose 1 according to the present invention has a jacket 2 with a rubber or synthetic resin lining 3 applied thereto. In the hose for use, the center of gravity W exists in one direction on the outer peripheral side (in the drawing, arrow D direction) on the cross section perpendicular to the longitudinal direction of the hose 1, and the outer peripheral side in one direction (arrow D direction) ) At a right angle to the hose center C and divided into two by a dividing line L, the weight ratio configuration satisfies the following formula (a), and the hose thickness T is substantially equal to the entire circumference. It is characterized by being uniformly formed.
Weight on the side with the center of gravity W: Weight on the side without the center of gravity W = 1.03 to 1.3: 1 (a)

  That is, in the fire hose shown in FIG. 1, the center of gravity is biased upward in the drawing.

  Such a fire hose of the present invention is, for example, as shown in FIG. 2, when it is stretched from a state where it is double-wound in a coil shape with the side where the center of gravity exists facing upward, By releasing or rolling toward the direction where you want to inflate as an arcuate curve, the upper side with the center of gravity performs the leading action in the direction you want to expand, and the hose spreads in an arc or curved shape more sharply and smoothly It can be thrown for easy expansion.

  In addition, the double winding is a coil wound as shown in FIGS. 2, 4 and 6, with the hose being bent at approximately the center of the hose, with the center bending point as the core. Although not shown at both ends of the hose, a male fitting M and a female fitting F are attached. The male fitting M and the female fitting F are generally wound in a coiled manner so that the male fitting M is on the inside.

  Also, as shown in FIG. 1 and FIG. 2, the fire hose according to the present invention has a jacket outer periphery so that the hose line can be seen firmly and the presence or absence of torsion etc. is easily recognized. It is also important to have one vertical color line 4 along the longitudinal direction of the hose, and the provision of the vertical color line is also required by laws and regulations (“Ministerial Ordinance for Establishing Technical Standards for Fire Hose”). The Therefore, although the vertical color line 4 is also provided in a conventional fire hose, it is also called a “vertical line”. Generally, however, a colored thread of appropriate thickness such as red is used. It is only necessary to be woven in a form that can be easily seen with the naked eye and to be present on the outer periphery of the jacket.

  In the present invention, the weight ratio of the side with the center of gravity W to the weight without the center of gravity W is within the range of the weight of the side with the center of gravity W: the weight without the center of gravity W = 1.03 to 1.3: 1. When the ratio is less than 1.03, it is difficult to obtain the effect of the present invention as expected, and when the ratio exceeds 1.3, fire fighting is difficult. In the overall configuration of the hose for use, the overall weight is inevitably increased, and the balance with other components such as the necessity of increasing the overall weight is lost.

  In the fire hose of the present invention, as shown in FIG. 1 and FIG. 2, the hose is flattened along the above-mentioned two dividing line L so that the side with the center of gravity W is on the upper side, and double winding is performed. Although it is good to do, it is not necessarily limited to the case where the center of gravity is at the top, and it is also possible to intentionally wind the hose so that it is in a different position, which is also the fire hose of the present invention. It is also a feature point.

  That is, as shown in FIG. 3 and FIG. 4, the usage shown in FIGS. 1 and 2 is 90 degrees different from the usage shown in FIG. When the coiled winding body is laid sideways, it may be used by being wound and double-wrapped so that it faces the outer periphery.

  In that case, when extending from a state where it is wound in a coil shape, when rolling or releasing in a state where the double winding body is raised toward the direction to be stretched, while rolling It is possible to prevent the hose from rolling in an unexpected direction as much as possible by applying a stable and orderly force to the hose and a leading force in the direction of rolling.

  Alternatively, as shown in FIGS. 5 and 6, the usage shown in FIGS. 1 and 2 is 180 degrees different from the usage shown in FIG. When the coiled roll is laid sideways, it may be turned and stored and used so as to face the ground.

  As shown in FIG. 1 and FIG. 2 described above, it is suitable for right-handed people to release the hose so that the side with the center of gravity W is on the upper side and it is flattened and double-wound. In addition, as shown in FIGS. 5 and 6, the left-handed person releases the hose by crushing in a flat shape so that the side with the center of gravity W is on the lower side. Suitable for

  In the present invention, the vertical color line 4 described above is positioned on the outer peripheral side of the coil winding as shown in FIGS. 2, 4 and 6 so that it can be easily seen even when wound in a coil shape. It is usual to be provided.

  In the mode shown in FIG. 1, the vertical color line 4 is present on a line perpendicular to the outer peripheral side direction (D direction) in which the center of gravity W is biased in the outer peripheral side direction. It is.

  Moreover, in the aspect shown in FIG. 3, the vertical color line 4 is present on the line in the outer peripheral side direction in which the center of gravity W is biased in the outer peripheral side direction.

  Further, in the aspect shown in FIG. 5, the vertical color line 4 is present on a line perpendicular to the outer peripheral side direction (D direction) in which the center of gravity W is biased in the outer peripheral side direction. It is.

  When manufacturing the fire hose of the present invention, for example, the jacket is made of a woven fabric, and the woven density of the woven fabric is partially changed along the hose circumferential direction so that the center of gravity exists in a biased manner. In addition, the weight ratio is configured so as to satisfy the above-mentioned range, or the specific gravity of rubber or synthetic resin lined on the jacket is partially changed along the hose circumferential direction. Etc. can be achieved.

  Further, like a fire hose described in Japanese Patent Application Laid-Open No. 7-4569, a large number of protrusions extending in the hose length direction on the inner peripheral surface of a hose with a rubber or synthetic resin lining. In the case of a hose in which (ribs) are provided in parallel, it can also be achieved by partially changing the number of protrusions (ribs) present along the circumferential direction of the hose.

  It can also be achieved by means such as partially increasing the thickness within a range in which the thickness of the hose in the present invention described later is uniform over the entire circumference.

Of course, a plurality of means described above may be combined as appropriate.
Above all, it is relatively easy and preferable to cause the center of gravity to be biased by partially changing the woven density of the fabric along the circumferential direction of the hose.

  In particular, in FIG. 1, FIG. 3 or FIG. 5, in the vicinity of the region indicated by the one-dot chain line region A and in the region of about 10% to 30% of the entire outer periphery, the warp yarn weave density is increased, and the hose of the present invention. Is preferably realized.

  In addition, it is possible to take measures such as weaving using a weaving yarn having a large specific gravity as a weaving yarn for weaving the fabric, and adopting a combination of these means within the above-mentioned weight ratio range. It can be.

  Furthermore, if the outer surface of the jacket is coated with a synthetic resin or the like, it can also be achieved by means such as partially increasing the amount of resin or impregnated resin of the outer surface coating. When the warp yarn weave density is increased and the weight is increased, the coating resin amount and the impregnating resin amount are increased in accordance with the yarn amount.

  In any case, the weight (specific gravity) is increased or the density is increased in the vicinity illustrated by the one-dot chain line region A in each drawing and in the region of about 10 to 30% of the entire outer periphery, and / or It is preferable to realize the hose of the present invention by using the various means described above and making the weight of the region heavier than other regions.

  In addition, as shown in FIGS. 2, 4, and 6, on the jacket of the hose, the boundary is visually confirmed and recognized near the boundary between the region A where the weight is heavy and the region where the weight is not heavy. It is preferable to provide the boundary color line 5 so that it can do. It is preferable to easily understand the boundary between the region A where the weight is increased and the region where the weight is not so as to facilitate the operation and handling of the hose. As shown in the hose cross-sectional views of FIGS. 1, 3, and 5, the boundary color line 5 may be provided on the outer periphery of the jacket 2 with a single line or a plurality of lines with good visibility. It ’s good.

  After all, generally, the boundary color line 5 and the vertical color line 4 described above change the direction by about 90 degrees in the circumferential direction as shown in FIG. 1 or FIG. It is practical and preferable to exist. In such a configuration, at least one of the color lines existing in the length direction of the hose is often visually recognized, and the hose is twisted or bent instantly when expanded. Thus, the necessary correction work can be performed quickly and appropriately.

  In addition, the boundary color line 5 and the vertical color line 4 may be present in the circumferential direction as in the case shown in FIG. The direction in which the vertical color line 4 exists can be recognized more accurately and quickly.

  In the fire hose of the present invention, it is important that the thickness of the hose is formed to have a uniform thickness over the entire circumference. If the thickness is not uniform, the winding diameter is reduced when the coil is wound. It is not preferable because it becomes large, compact winding itself becomes difficult, or it becomes difficult to stand upright on the road surface / floor surface as a hose winding body.

  Therefore, when manufacturing the fire hose of the present invention, the thickness and weight of the woven yarn, the woven density, and the lining material so that the center of gravity exists in an uneven manner while maintaining the thickness uniform throughout the entire circumference. It is important to form a hose by partially changing the specific gravity and the like along the circumferential direction.

  However, in the present invention, when the thickness data is collected, the difference between the thinnest data and the thinnest data is within 5% (the thinnest data is 100%). If the thinnest data is within 105%, the difference between the thinnest data and the thinnest data is preferably within 3% (when the thinnest data is 100%, the thickest data is 103%). More preferably, the distribution is such that the difference between the thinnest data and the thinnest data is within 2.5% (when the thinnest data is 100%, the thinnest data is within 102.5%). That's what it says.

  In addition, as in the fire hose described in the above-mentioned JP-A-7-4569, a large number of hoses extending in the length direction of the hose are provided on the inner peripheral surface of the hose provided with a rubber or synthetic resin lining. In the case of a hose provided with ridges (ribs) in parallel, the height of the multiple ridges (ribs) is not included in the concept of thickness, and the ridges (ribs) are excluded. The thickness at the “ground” and “base” is within the above-mentioned range.

  Hereinafter, based on an Example, the specific structure of the hose for fire fighting of this invention and an effect are demonstrated.

Example 1
In the embodiment shown in FIG. 1 and FIG. 2, a jacket is manufactured by weaving a tubular woven fabric using the following weaving yarn, and further a synthetic resin lining is applied, and a fire hose according to the present invention (hose designation 65: An inner diameter of about 65 mm) was produced.

  As for the warp yarn, the normal density part is polyester spun yarn 20s / 7, and all 420 yarns are passed through a total of 10 wrinkles (42 per yarn), and the high density part is polyester spun yarn 20s / 7, all 104 yarns. Was woven through two folds (52 per fold).

  That is, the normal density portion has a weave density of 42 warp yarns per ridge, the high density portion has a warp density of 52 warp yarns per heel, and the warp yarn has a higher density portion than the normal density portion. The weight used is 23.8% higher.

  As the weft yarn, a polyester filament processed yarn (57 crimps / 10 cm) 1100 dtex / 4 was used.

  As the synthetic resin lining, urethane resin was used, and the coating amount was 90 g / hose length of 1 m.

For the vertical color line, red dyed yarn was used.
When the thickness of the fire hose was measured at intervals of 0.5 cm over the entire circumference, it was 2.0 mm at the thickest part and 2.1 mm at the thinnest part.

  The weight ratio when the fire hose thus obtained is divided into two by the dividing line passing through the center point of the hose between the side with the center of gravity and the side without the center of gravity is the side with the center of gravity: the side without the center of gravity = 1.15: 1.0. This hose weight is obtained by measuring the length of the hose 1 m, measuring n number as 3, and averaging the obtained values, while the total weight is 282.0 g. One side was 150.8 g, and the side without the center of gravity was 131.2 g.

  The hose thus obtained was double-wound and tested for stretchability when a right-handed person released in that state.

  As a result, the fire hose of the present invention spreads in a good clean arc shape when released and is easy to expand as desired.

Example 2
In the embodiment shown in FIGS. 3 and 4, a jacket was manufactured by weaving a tubular woven fabric using the following weaving yarn, and a synthetic resin lining was applied to manufacture a fire hose according to the present invention.

  As warp yarn, polyester spun yarn 20s / 7, 394 (9cm) is usually used for the density part, and polyester filament processed yarn (57 crimps / 10cm) 1100dtex / 2 (3cm) is used for the high density part. .

  That is, when converted to decitex, the warp yarn weight is 2050 dtex in the normal density portion, the warp yarn weight is 2200 dtex in the high density portion, and the weight of the warp yarn used is higher by 7.3% in the high density portion than in the normal density portion. It is.

  As the weft yarn, a polyester filament processed yarn (57 crimps / 10 cm) 1100 dtex / 4 was used.

  As the synthetic resin lining, urethane resin was used, and the coating amount was 90 g / hose length of 1 m.

For the vertical color line, red dyed yarn was used.
The thickness of the fire hose was 2.0 mm at the thick part and 2.1 mm at the thinnest part when the thickness at 0.5 cm intervals was measured over the entire circumference.

  The weight ratio when the fire hose thus obtained is divided into two by the dividing line passing through the center point of the hose between the side with the center of gravity and the side without the center of gravity is the side with the center of gravity: the side without the center of gravity = 1.15: 1.0.

  The hose thus obtained was double wound and tested for stretchability when released in that state.

  As a result, the fire hose of the present invention is easy to be stretched straight without rolling and bending when it is rolled, and it is easy to realize the stretched state intended by the operator. Was confirmed.

FIG. 1 is a schematic cross-sectional view of a hose showing an embodiment of a fire hose according to the present invention. FIG. 2 is a schematic perspective view showing an example of a state in which a fire hose according to the present invention is coiled. FIG. 3 is a schematic cross-sectional view of a hose showing another embodiment of a fire hose according to the present invention. FIG. 4 is a schematic perspective view showing another example of a state in which a fire hose according to the present invention is coiled. FIG. 5 is a schematic cross-sectional view of a hose showing another embodiment of a fire hose according to the present invention. FIG. 6 is a schematic perspective view showing another example of a state in which a fire hose according to the present invention is coiled.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire hose 2 Jacket 3 Rubber or synthetic resin lining 4 Vertical color line 5 Boundary color line W Center of gravity C Hose center point L The center of gravity W is perpendicular to one direction and the hose center point C is Through line T Hose thickness D The direction where the center of gravity W is biased in one direction on the outer circumference side A Area indicating the vicinity of the “folding ear” M Male fitting F Female fitting

Claims (10)

  In a fire hose with a jacket of rubber or synthetic resin on the jacket, the center of gravity is present in a biased direction in the outer circumferential direction on the cross section perpendicular to the longitudinal direction of the hose, and the center of gravity is biased. When divided into two by a dividing line passing through the center of the hose at a right angle to the existing outer peripheral side direction (weight on the side with the center of gravity: weight on the side without the center of gravity = 1.03 to 1.3: 1) A fire hose characterized in that the hose thickness is uniformly formed around the entire circumference.   On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is offset in one direction on the outer peripheral side is 10% to 30% in the region of the entire circumference of the hose in the cross section. The fire hose according to claim 1, wherein the fire hose is formed to be heavy.   The outer periphery of the jacket has a single vertical color line provided along the longitudinal direction of the hose, and the vertical color line is in the outer peripheral side direction in which the center of gravity is biased in the outer peripheral side direction. The fire hose according to claim 1 or 2, wherein the fire hose is present on the line.   The outer periphery of the jacket has a single vertical color line provided along the longitudinal direction of the hose, and the vertical color line is in the outer peripheral side direction in which the center of gravity is biased in the outer peripheral side direction. The fire hose according to claim 1 or 2, wherein the fire hose is present on a line perpendicular to the fire hose.    On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is offset in one direction on the outer peripheral side is formed so that the weight is heavier than the other parts in some areas around the entire hose in the cross section. The outer periphery of the jacket is formed along the longitudinal direction of the hose near the boundary between the other portion and the region where the weight is formed heavier than the other portion. A fire hose according to any one of claims 1 to 4, wherein a boundary color line is provided.   On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is such that the jacket is made of woven fabric, and the woven yarn density of the woven fabric is in the circumferential direction of the hose. Accordingly, the fire hose according to any one of claims 1 to 5, wherein the fire hose is formed by being partially changed.   On the cross-section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is that the specific gravity of the rubber or synthetic resin lining the jacket is partially along the circumferential direction of the hose. The fire hose according to any one of claims 1 to 5, wherein the fire hose is formed by being changed.   On the cross-section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side, the rubber or synthetic resin layer lining the jacket is on the inner surface of the hose. It has a plurality of ribs with a height of 0.3 to 2 mm extending in the length direction, and is formed by partially changing the existence pitch of the ribs along the hose circumferential direction The fire hose according to any one of claims 1 to 5, wherein the hose is a fire hose.   On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side has a structure in which the jacket is impregnated with synthetic resin at the outer periphery and covered with the synthetic resin. The fire hose according to any one of claims 1 to 5, wherein the amount of impregnated coating of the synthetic resin is partially changed along the hose circumferential direction. .   On the cross section perpendicular to the longitudinal direction of the hose, the structure in which the center of gravity is biased in one direction on the outer peripheral side is formed by a combination of two or more selected from claims 5-9. The fire hose according to any one of claims 1 to 9.

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