JP2016223623A - Flexible two-layer water spray hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible two-layer water spray hose capable of preventing a configuration of a connected part from being released by an expansion force of an internal elastic hose expanding upon receiving water pressure when water is sprinkled.SOLUTION: A flexible two-layer water spray hose of a double structure comprises an inner elastic hose 3 expanding in a radial direction and a longitudinal direction by water pressure, and an external protection cover 5 protecting the inner elastic hose 3, non-expandable in a radial direction, restricting an expansion in a radial direction of the inner elastic hose 3 and in turn folded in a bellows form in a longitudinal direction, expandable or retractable as expansion or retraction of the inner elastic hose 3 in its longitudinal direction and guiding the expansion of the inner elastic hose 3 in its longitudinal direction. The flexible two-layer water spray hose is provided with a diameter deformable joint 7 connected directly or indirectly to a faucet, an end part of the inner elastic hose 3 is covered by the external protection cover 5 and temporarily set by a seal 10 under a state in which it is fitted to the deformable joint 7, and it is covered by a pad cover 11 and strictly fixed by a metallic caulking member 9.SELECTED DRAWING: Figure 2

Description

  The present invention is used for sprinkling or water supply by connecting to a tap or the like of a water supply. When not in use, the hose is contracted to be short and compact, and when used, the hose is extended to sprinkle the desired watering part. For easy watering hose.

  Conventionally, for example, “X hose (registered trademark)” or “magic hose” or the like, the hose contracts when it is not used and is short and compact. An elastic watering hose that is easy to sprinkle is sold.

  In relation to such a stretchable watering hose, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2013-177963) and Patent Document 2 (Utility Model Registration No. 3186680), the hose is automatically injected by water injection at the time of use. The invention and device have been disclosed for the purpose of providing a method of using a stretchable two-layer watering hose that is stretched to the original state and automatically contracts and returns to its original state by water discharge when not in use.

  And as a specific joining structure, the above-mentioned patent document 2 states that “the rubber hose 103 that expands in the radial direction and the longitudinal direction due to water pressure inside, and the rubber hose that covers the rubber hose and cannot expand in the radial direction and is in the radial direction of the internal rubber hose. A double structure comprising a protective cover 106 that restricts expansion, is folded in a bellows shape in the longitudinal direction, can be expanded and contracted in the longitudinal direction of the rubber hose, and induces expansion in the longitudinal direction of the rubber hose A joint structure of a stretchable hose faucet or watering nozzle that can be automatically expanded and contracted by water pressure in the internal rubber hose has been proposed.

  That is, “Large-diameter cavities 102A and 202A connected to faucets or watering nozzles, connected to the large-diameter cavities, projecting away from the faucets or watering nozzles, and connected to the internal rubber hose of the elastic hose. Deformation joints 102 and 202 having small-diameter cavities 102B and 202B are provided, and the end portions of the internal rubber hose 103 are fitted into the trunk from the tip to the small-diameter cavities 102B and 202B, and then the pad cover 105 is fastened by the fastener members 104 and 204. , 205 is tightened to prevent water from falling forward when expanded, while the end of the protective cover 106 is not fixed, and the internal rubber hose 103 expands when the internal rubber hose 103 expands so that the protective cover is attached to the fastener member or A joining structure is disclosed that allows the pad cover to be locked.

JP 2013-177963 A Utility Model Registration No. 3186680 Specification

  However, in the stretchable hose having the structure including the joint structure disclosed in Patent Document 2, the expansion force of the internal rubber hose that is expanded by receiving water pressure when actually connected to the faucet and spraying water is high, and the fastener member. In addition, there is a problem that the internal rubber hose and the protective cover also fall off, and there is a problem that this cannot be reliably prevented.

  In response to such a problem, the present inventors have repeatedly changed the design of the structure of the portion connecting the internal rubber hose and the protective cover, and the material and dimensions of the internal rubber hose and the protective cover, thousands to tens of thousands of times. By conducting extensive water spraying experiments, the inventors have invented a stretchable hose that can more reliably prevent the above problems.

  Therefore, the present invention has been created in view of the above problems, and is a connection constituted by a fitting portion of an internal elastic hose and a deformation joint, an external protective cover that covers the fitting portion, and a pad cover. It is possible to prevent the connection part from being released due to the expansion force of the internal elastic hose that expands under the pressure of the metal caulking member and is firmly fixed from the outside with the pressure of the metal caulking member in a structure having a specific positional relationship It aims at providing a flexible stretchable two-layer watering hose.

In order to solve the above problems, the present invention provides:
The internal elastic hose 3 that expands in the radial direction and the longitudinal direction due to the water pressure applied to the inside, and protects the internal elastic hose 3 and cannot expand in the radial direction and restricts the expansion of the internal elastic hose 3 in the radial direction. And an outer protective cover 5 that is folded in a bellows shape in the direction and can be expanded and contracted in accordance with the expansion and contraction in the longitudinal direction of the internal elastic hose 3, and induces expansion in the longitudinal direction of the internal elastic hose 3. A stretchable double-layer watering hose having a heavy structure that can be automatically extended and contracted in the longitudinal direction by water pressure in the internal elastic hose 3,
Comprising a variable diameter joint 7 connected directly or indirectly to the faucet;
An end portion of the internal elastic hose 3 is covered with the external protective cover 5 while being fitted to the deformable joint 7 and temporarily fixed with a seal 10, and further covered with a pad cover 11 and fixed member (for example, A metal caulking member) 9 and a structure that is tightly fixed,
An elastic two-layer watering hose characterized by the above is provided.

  In the stretchable two-layer watering hose of the present invention having the above-described configuration, the deformable joint 7 communicates with the tool connector 13 in a large diameter portion 7B, and communicates with the large diameter portion 7B. Projecting to the opposite side of the faucet connector 17 or the watering nozzle 15, and having a small diameter portion 7A connected to the internal elastic hose 3, the end of the internal elastic hose 3 is connected to the small diameter portion 7A. After the end portion is fitted into the body portion, the inner elastic hose 3 is covered with the outer protective cover 5, and the end portion of the outer protective cover 5 is fitted with the inner elastic hose 3 and the small diameter portion 7A. After the pad cover 11 is disposed outside the end of the external protective cover 5 that covers the fitting portion, the fitting portion of the internal elastic hose 3 and the small diameter portion 7A, and the external portion The end of the protective cover 5 and the A compartment cover 11, it is desirable to have the most from the outside is covered with a fixing member (for example, a metal crimping member) 9 tightly fix said.

  According to the stretchable two-layer watering hose of the present invention having such a configuration, the internal elastic hose 3 is inserted into the outer protective cover 5 contracted like a bellows in a normally contracted state. Therefore, when water is poured into the internal elastic hose 3 while water discharge from the water spray nozzle 31 is stopped, the contracted internal elastic hose 3 is filled with water and starts to expand. However, since the expansion of the internal elastic hose 3 in the radial direction is limited by the external protective cover 5, the internal elastic hose 3 extends in the longitudinal direction while extending the external protective cover 5 in the longitudinal direction while extending the bellows of the external protective cover 5. When it is integrated with the external protective cover 5 and becomes a rod shape, it becomes possible to spray water like a normal single-layer hollow hose. If the watering handle 16 is operated while continuing water pouring in this state, water can be sprinkled from the watering nozzle 31, and when the watering is finished, the operation of the watering handle is maintained while the watering is stopped, thereby expanding the internal elasticity. The water inside the internal elastic hose 3 is discharged from the water spray nozzle 31 due to the contraction pressure of the hose 3, and the internal elastic hose 3 contracts together with the external protective cover 5, and can return to the original state.

  Further, the end portion of the internal elastic hose 3 is fitted and communicated with the small-diameter portion 7A of the deformation joint 7, and the internal elastic hose 3 described above with the end portion of the external protective cover 5 and the pad cover 11 covering the internal elastic hose 3 is used. And it covers and overlaps the fitting part of the small diameter part 7A. The internal elastic hose 3 has an internal water pressure with a configuration in which the fitting portion, the end portion of the external protective cover 5 and the pad cover 11 are firmly fixed from the outermost side using a fixing member (for example, a metal caulking member) 9. When it expand | swells by this, the effect which prevents that the small diameter part 7A and the external protective cover 5 fall off from the said internal elastic hose 3 end part is acquired.

  Combined with the above-mentioned plural effects, the entire hose is automatically extended in the longitudinal direction by pouring water into the internal elastic hose 3 when watering, and the water inside the internal elastic hose 3 is discharged when not in use. The inner elastic hose 3 and the small-diameter portion 7A can be recovered by the strong expansion force of the inner elastic hose 3 that has been subjected to water pressure at the time of water sprinkling. The object of the present invention to completely prevent the connection configuration between the fitting portion and the end portion of the external protective cover 5 covering the fitting portion from being released is achieved.

Furthermore, in the stretchable two-layer watering hose of the present invention having the above-described configuration, the inner elastic hose 3 has a thickness of 1 to 3 mm and an inner diameter of 5 to 15 mm when no water pressure is applied to the inside. And
The dimensions of the internal elastic hose 3 with water pressure applied to the inside are non-rupture resistant to a diameter of 16 to 30 mm, the caliber area can be expanded 4 to 5 times, and stretched 2 to 5 times in the longitudinal direction. It is preferable to have possible characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the state which has arrange | positioned the elastic | stretch two-layer watering hose 1 which concerns on one Embodiment of this invention in a substantially plane, and partially viewed in cross section. It is the perspective view which showed the structure of the edge part of the internal elastic hose 3 in the elastic | stretch two-layer watering hose 1 shown in FIG. It is sectional drawing which showed the internal structure in the edge part of the elastic | stretch two-layer watering hose 1 shown in FIG. It is a figure for demonstrating the connection method of the faucet 23, the faucet coupler 17, and tool joint part 13B, 113B at the time of using the elastic | stretch two-layer watering hose 1 shown in FIG. 1, (a) Is a schematic diagram showing a method for connecting the faucet 23 and the faucet coupler 17, and (b) is a schematic diagram showing a method for connecting the faucet coupler 17 and the tool joint portions 13B and 113B. It is the schematic diagram which showed the connection method of the tool joint parts 13B and 113B and the watering nozzle 15 at the time of using the elastic | stretch two-layer watering hose 1 shown in FIG. It is a figure for demonstrating the method of watering using the elastic | stretch two-layer watering hose 1 shown in FIG. 1, (a) is a schematic diagram which shows the state which connected the faucet 23 and the faucet coupling tool 17, (b). Is a schematic diagram showing the extension of the internal elastic hose 3 and the external protective cover 5, and (c) is a schematic diagram showing a state where the watering nozzle 15 is operated to sprinkle water. It is a figure for demonstrating the water stop method of the stretchable two-layer watering hose 1 shown in FIG. 1, (a) is the schematic diagram which showed the state which operates the water stop valve of faucet 23, (b) It is the schematic diagram which showed shrinkage | contraction of the elastic hose 3 and the external protective cover 5. FIG. It is a photograph of the cylindrical body which knit the thread | yarn which twisted the polyester fiber in the cylinder shape. It is a photograph which shows a mode that the cylindrical body shown in FIG. 8 was pushed in and inserted in the rod-shaped body so that it might become a bellows shape. It is a photograph which shows a mode that the external protective cover which consists of a bellows-like cylindrical body was extended.

  Hereinafter, representative embodiments of the stretchable two-layer watering hose according to the present invention will be described in detail with reference to FIGS. 1 to 7, but it goes without saying that the present invention is not limited to those illustrated. Nor. Moreover, since each drawing is for conceptually explaining the present invention, the dimensions, ratios or numbers may be exaggerated or simplified as necessary for easy understanding. Further, in the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a plan view showing a state in which a stretchable two-layer watering hose 1 according to an embodiment of the present invention is arranged on a substantially flat surface and a part thereof is viewed in cross section. As shown in FIG. 1, the stretchable two-layer watering hose 1 of the present embodiment includes an inner elastic hose 3, an outer protective cover 5, a diameter changing joint 7, a metal caulking member 9, a pad cover 11, The tool connector 13, the watering nozzle 15, and the faucet coupler 17 are configured.

  The internal elastic hose 3 is composed of a rubber tube having excellent stretchability, and may optionally have a coating portion on the outer surface that improves the pressure resistance of the rubber tube. The rubber tube is mainly composed of natural rubber or synthetic rubber, and expands in the radial direction and extends in the longitudinal direction by applying water pressure inside. In a state where no water pressure is applied to the inside, the thickness is 1 to 3 mm, the inner diameter is 5 to 15 mm, preferably 8 to 10 mm, and the outer diameter is 8 to 15 mm. In a state where water pressure is applied to the inside, it has non-rupture resistance up to a diameter of 16 to 30 mm, expands to a caliber area of 4 to 5 times about twice in the radial direction, and 2 to 5 times in the longitudinal direction, preferably 2 to 2 times. It is possible to stretch 3 times.

  The length of the internal elastic hose is usually 6 to 7 m and may be 15 m when watering, but is usually 7 m and preferably 15 m when watering. In existing products and the like, it is normally 5 m and 15 m when sprinkled, but the higher the elongation rate, the stronger the expansion force of the internal rubber hose that expands due to water pressure when sprinkling. On the other hand, in the present embodiment, the internal elastic hose 3 can be effectively prevented from falling off due to the expansion force by setting the length to 7 m normally and 15 m for watering.

Below, an example of a suitable composition and physical property in the rubber tube of the internal elastic hose 3 is shown.
Composition: total solid content: 61.5% or more, dry rubber content: 50% or more, non-rubber component: 2.0% or less, total ammonia content: 0.60% or more, ammonia content in aqueous phase: 2. 0% or less, latex pH: 11.0 or less, volatile fatty acid number (VFA): 0.20 or more, mechanical stability time @ 55% TS (BEC) 850 or more, magnesium content: 30 ppm or less

Physical properties: linear density (LD): 1100 to 1200 [dtex], 1000 to 1100 [D]; tearing force (BF):> 90 [N]; tearing strength:> 8.00 [cN / dtex],> 9. 00 [g / D], Rupture strength coefficient (CV): <3.00%, Rupture elongation rate (EAB): 14.0% or more; Rupture elongation rate coefficient (CV): 8.00% or less; 4.0 Load elongation at the time of [cN / dtex] 5.0 or more; Thermal contraction rate (HAS): 7.5% or more; Oil content (FOY) 0.55% or more; IM (intermingling): 5 [knots / m]

  When providing a coating | coated part, it is a high-density polymer which coat | covered the outer side of the rubber tube in the composition and physical property mentioned above, and has improved the pressure | voltage resistant performance of the internal elastic hose 3. FIG.

  Next, the external protective cover 5 will be described. The outer protective cover 5 is a bellows-like polyester fiber cloth hose, has a length in the longitudinal direction that is approximately 2 to 5 times that of the internal elastic hose 3, and has an inner diameter larger than the outer diameter of the internal elastic hose 3. Therefore, the internal elastic hose 3 can be inserted into the external protective cover 5. Since the internal elastic hose 3 has elasticity, it expands in the longitudinal direction and the radial direction when water pressure is applied to the inside, but the external protective cover 5 restricts the expansion in the radial direction. It will extend only in the longitudinal direction.

  That is, the outer protective cover 5 has a role of restricting expansion of the inner elastic hose 3 in the radial direction when water pressure is applied to the inner elastic hose 3 and promoting extension in the longitudinal direction. Yes. For this reason, since the external protective cover 5 expands and contracts the external protective cover 5 in response to expansion and contraction in the longitudinal direction of the internal elastic hose 3, a uniform crease is formed on the surface to form a bellows shape.

Here, the outer protective cover 5 may be frayed or torn due to friction with the ground while the expansion or contraction is repeated by using the stretchable two-layer hose 1 of the present embodiment. Therefore, the present inventors have intensively studied the structure of the external protective cover 5 in order to effectively suppress this. As a result, conventionally, a knitted or woven fabric of 300 denier polyester fiber (warp or weft) and 900 denier polyester fiber (weft or warp) was used, but 500 to 700 denier polyester fiber (warp or weft). ) And 500 to 700 denier polyester fiber (weft or warp) twisted yarn. The warp and the weft are preferably the same denier. Further, the thickness of the yarn is preferably 5200 to 5400 denier. Also, yarn basis weight may in the range of 900~1100g / ^{m 2,} preferably from 1000~1050g / ^{m 2.}

  Here, the inventor has found that it is preferable to use, as the external protective cover 5, a bellows-like tubular body made of polyester fiber knitted fabric having an bellows structure and having an outer surface melted and solidified. Specifically, first, a tubular body knitted in a cylindrical shape by twisting a polyester fiber is prepared (see FIG. 8), and inserted into a long and thin rod-like body. Push to insert into a bellows shape (see FIG. 9). In this state, the outer surface is ironed and heated to melt, and the surface is solidified. Accordingly, the contact area with the internal elastic hose 3 is reduced by the bellows structure, and the friction is reduced and the durability is increased. FIG. 10 is a photograph showing a state in which an external protective cover made of a bellows-like cylindrical body is extended.

  Next, other members constituting the stretchable two-layer watering hose 1 of the present embodiment will be described with reference to FIG. FIG. 2 is a perspective view showing the configuration of the end portion of the internal elastic hose 3 in the stretchable two-layer watering hose 1 of the present embodiment. First, the variable diameter joint 7 connected to the end of the internal elastic hose 3 and fitted with the tool connector 13 will be described. As shown in FIG. 2, the tool connector 13 is inserted into the inner elastic hose 3 so as to communicate with the small diameter portion 7A, the tool connector 13 is fitted with the tool connector 13 and communicated with the large diameter portion 7B, and the user. Is composed of a gripping portion 7C that is gripped and operated when the deformable joint 7 and the tool connector 13 are fitted, and a cylindrical portion 7D that connects the small diameter portion 7A and the large diameter portion 7B.

  The small-diameter portion 7A is cylindrical and has a hollow inside, and a plurality of ring-shaped protrusions that improve the fitting with the internal elastic hose 3 are provided on the outside. The large-diameter portion 7B is cylindrical with a large diameter compared to the small-diameter portion 7B. The large-diameter portion 7B is also hollow inside, and externally there are threads for fitting with the tool connector 13. Is provided. The hollow portion of the small diameter portion 7A and the hollow portion of the large diameter portion 7B communicate with each other, and the water flowing through the internal elastic hose 3 can pass through the inside of the variable diameter joint 7.

  The large-diameter portion 7B is provided with a gripping portion 7C. This gripping part 7C is a cylindrical and flanged part located at the end of the large diameter part 7B on the cylindrical part 7D side. The grip portion 7C is provided with a plurality of protrusions (not shown) on the surface for assisting the rotational operation of the diameter changing joint 7 when the diameter changing joint 7 is screwed to the tool connector 13. Yes.

  Then, in the portion where the small diameter portion 7A and the cylindrical portion 7D are connected, a substantially disc-shaped flat step portion S1 is located, and the portion where the cylindrical portion 7D and the large diameter portion 7B are connected (that is, A substantially disc-shaped flat stepped portion S2 is located on the cylindrical portion 7D side of the gripping portion 7C.

  Next, the metal caulking member 9, the seal 10, and the pad cover 11 will be described. As shown in FIG. 2, the seal 10 and the pad cover 11 cover the end portions of the external protective cover 5 on the fitting portions of the internal elastic hose 3 and the variable diameter joint 7, and further cover them from the outside. In particular, the seal 10 is effective for temporarily fixing the outer protective cover 5 to the variable diameter joint 7, and finally contributes to a strong connection structure. Therefore, the seal 10 may be shorter than the pad cover 11.

  Specifically, the seal 10 and the pad cover 11 are preferably made of rubber, and prevent the displacement of the external protective cover 5 disposed inside and the external protective cover 5, the internal elastic hose 3, the variable diameter joint 7, It has a role of applying an appropriate gripping pressure to the. The pad cover 11 has a substantially cylindrical shape with a hollow inside, is formed in a skirt shape from a substantially middle portion to one end portion, and the diameter increases toward the end portion.

  The metal caulking member 9 is a substantially cylindrical metal member having a hollow inside. As shown in FIG. 2, the metal caulking member 9 has an internal elastic hose 3 fitted to the variable diameter joint 7, an end portion of the external protective cover 5 covering the outside of the fitting portion, and further to the outside. It has a role which fixes the covered pad cover 11 with a pressure. The metal caulking member 9 does not apply pressure by being wound in a belt type, but it applies pressure by deforming the metal caulking member 9 itself by caulking, so that a very strong fixing force can be obtained. It is.

  Next, the tool connector 13 will be described. As shown in FIG. 2, the tool connector is composed of a fitting portion 13 </ b> A for fitting with the large diameter portion 7 </ b> B of the variable diameter joint 7 and a tool joint portion 13 </ b> B for connecting with the watering nozzle 15 or the faucet coupler 17. Yes. 13 A of fitting parts are cylindrical shape, and the inside is comprised hollow, The tap which makes it fit with the large diameter part 7B is provided in the internal diameter part. In addition, a plurality of protrusions are provided on the outside for facilitating the rotation operation required when the tool connector 13 and the diameter change joint 7 are screwed together.

  The inside of the tool joint portion 13B is also hollow, and the hollow portion of the fitting portion 13A communicates with the hollow portion of the tool joint portion 13B, and flows through the internal elastic hose 3 and the variable diameter joint 7. The water is configured to pass through the inside of the tool connector 13. In addition, the tool joint portion 13B has a structure that allows the watering nozzle 15 or the faucet connector 17 to be attached to and detached from the hollow portion.

  Next, the configuration of the end portion of the internal elastic hose 3 described above will be described in more detail with reference to FIG. FIG. 3 is a cross-sectional view showing a part of the configuration of the stretchable two-layer watering hose 1 according to the embodiment of the present invention. However, in FIG. 3, a gap appears in part so that the positional relationship of each member can be easily understood, but the actual stretchable two-layer watering hose 1 does not have such a gap.

  As shown in FIG. 3, the small diameter portion 7 </ b> A of the variable diameter joint 7 is inserted into the inside of the end portion of the internal elastic hose 3. There is no gap between the fitting portions of the internal elastic hose 3 and the diameter changing joint 7, and a strong fitting is achieved by the ring-shaped protrusion provided outside the small diameter portion 7A of the diameter changing joint 7.

  The external protective cover 5 covers the outside of the internal elastic hose 3, covers the end of the external protective cover 5 with the fitting portion of the internal elastic hose 3 and the variable diameter joint 7, and then temporarily fixes with the seal 10. . And the pad cover 11 is arrange | positioned from the outer side, and it fixes firmly using the metal crimping member 9. FIG. Further, the diameter changing joint 7 grips and rotates the gripping portion 7 </ b> C, and the large diameter portion 7 </ b> B is screwed into the fitting portion 13 </ b> A of the tool connector 13.

  In particular, in the present embodiment, unlike the conventional case, the outer protection cover 5 and the end of the seal 10 (upper end in FIG. 3) have a structure that abuts against the stepped portion S1, and the pad cover 11 and The metal caulking member 9 has a structure in which an end portion (upper end portion in FIG. 3) is in contact with the stepped portion S2. In addition, the end part (upper end part in FIG. 3) of the internal elastic hose 3 is also connected so as to contact the stepped part S1. In addition, it is preferable that the stretchable two-layer watering hose 1 of the present embodiment includes the configuration of each member at the end portion of the internal elastic hose 3 described above at both ends of the internal elastic hose 3.

  With such a structure, as described above, the members of each part are firmly fixed or fitted so that they do not come off even during watering, and the hollow parts inside the members of each part are reliably communicated with each other. The present inventors have found that when water flows, water can be launched only in a desired direction without leaking from the connection portion of each member to the outside. On the other hand, in the joint structure in Patent Document 2, when water is poured into the internal elastic hose 3 and the internal elastic hose 3 expands when water is sprayed, the end of the internal elastic hose 3 and the small diameter of the variable diameter joint 7 are used. There is a problem that the joint portion with the portion 7A is detached.

  The stretchability of the present invention will be described below with reference to FIGS. 4 (a), (b), FIG. 5, FIGS. 6 (a), (b), (c), and FIGS. 7 (a), (b). A specific method of using the two-layer watering hose 1 will be described. FIG. 4 shows a method of connecting the faucet 23, the faucet coupler 17, and the tool joint portion 13B. FIG. 4A is a schematic diagram showing a method of connecting the faucet 23 and the faucet coupler 17. FIG. 4B is a schematic view showing a method of connecting the faucet coupler 17 and the tool joint portion 13B.

  As shown in FIG. 4A, a faucet connector 17 configured by connecting two substantially cylindrical members having hollow insides having different diameters is fitted to the water outlet of the faucet 23. After fitting the faucet connector 17 to the faucet 23, the fixing screw 19 provided in the faucet connector 17 is tightened to firmly fix the faucet 23 according to the size of the faucet 23. Subsequently, as shown in FIG. 4B, the main body connecting portion 21 of the faucet coupler 17 is inserted into the tool joint 13B and fixed, thereby completing the connection of the stretchable two-layer watering hose at the water inlet portion. Moreover, it is substantially the same also in the connection method of a water discharge part, and as shown in FIG. 5, the main body connection part 121 with which the watering nozzle 15 was equipped is inserted in the inside of the tool joint 113B, and it completes.

  Next, a watering method using the stretchable two-layer watering hose 1 of the present invention will be described with reference to FIGS. 6 (a), 6 (b), and 6 (c). 6A shows a state in which the water stop valve of the faucet 23 is operated, and FIG. 6B is a schematic view showing the extension of the internal elastic hose 3 and the external protective cover 5. (C) is the schematic diagram which showed the state which operates the watering nozzle 15 and performs watering.

  As described in detail so far, the stretchable two-layer watering hose 1 of the present invention has the elongated internal elastic hose 3 inserted in the outer protective cover 5 that is normally contracted in a bellows shape in a contracted state. A water spray nozzle 31 is provided at the front end, and a faucet connector 17 connected to the faucet 23 is provided at the rear end. As shown to Fig.6 (a), a user operates the water stop valve of faucet 23 and injects water into the internal elastic hose 3 from a rear end. The water injected into the internal elastic hose 3 is stopped by the water spray nozzle 15 at the tip, and gradually fills the internal elastic hose 3 without being sprinkled from the tip.

  As shown in FIG. 6B, the internal elastic hose starts to expand and extend by continuing water injection even after the inside of the internal elastic hose 3 is filled with water. However, the expansion in the radial direction is limited by the external protective cover 5, and the external protective cover 5 that has been expanded and contracted in a bellows shape is extended along the external protective cover 5 in the longitudinal direction. When the internal elastic hose 3 extends to the maximum and is integrated with the external protective cover 5 into a rod shape, the user operates the watering handle 16 provided in the watering nozzle 15 as shown in FIG. Water is sprayed from the water nozzle 15.

  Then, the water stop method using the stretchable two-layer watering hose 1 of this invention is demonstrated with reference to Fig.7 (a), (b). FIG. 7A is a schematic diagram illustrating a state in which the water stop valve of the faucet 23 is operated, and FIG. 7B is a schematic diagram illustrating the contraction of the internal elastic hose 3 and the external protective cover 5. .

  When water is stopped as shown in FIG. 7A, the user operates the water stop valve of the faucet 23 to stop water injection from the rear end into the internal elastic hose 3. At this time, the watering handle 16 in the watering nozzle 15 keeps the watering operation state. As shown in FIG. 7B, the internal elastic hose 3 gradually loses the internal pressure due to water, and itself contracts in the longitudinal direction while returning the external protective cover 5 to a normal bellows shape. Further, as the internal elastic hose 3 contracts, the water accumulated inside the internal elastic hose 3 is discharged to the outside, and thus returns to its original shape with a light weight. After the internal elastic hose 3 returns to the original state, the operation of the watering handle 16 is stopped, and watering using the stretchable two-layer watering hose 1 is completed.

  The exemplary embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to these embodiments, and does not depart from the spirit and teaching of the claims. It will be readily apparent to those skilled in the art that other modifications and variations exist within the scope. For example, if silicone oil is applied to the outer surface of the internal elastic hose 3 to provide a silicone oil layer, friction with the external protective cover 5 can be reduced, and durability can be further improved.

  The stretchable two-layer watering hose of the present invention automatically extends in the longitudinal direction by pouring water inside the internal elastic hose when watering, and automatically by discharging water inside the internal elastic hose when not in use. The elastic two-layer watering hose that can be restored to its original state, but with the strong expansion force of the internal elastic hose that received water pressure during watering, the internal elastic hose and the fitting part of the small diameter part, This completely prevents the connection configuration between the end portion of the external protective cover covering the fitting portion from being released.

DESCRIPTION OF SYMBOLS 1 Stretchable two-layer watering hose 3 Internal elastic hose 5 External protective cover 7 Diameter change joint 7A Small diameter part 7B Large diameter part 7C Gripping part 7D Cylindrical part 9 Metal caulking member 10 Seal 11 Pad cover 13 Tool connector 13A Fitting part 13B , 113B Tool joint part 15 Sprinkling nozzle 16 Sprinkling handle 17 Faucet connector 19 Fixing screw 21, 121 Body connecting part 23 Faucet S1 Step part S2 Step part

Claims (3)

The internal elastic hose 3 that expands in the radial direction and the longitudinal direction due to the water pressure applied to the inside, and protects the internal elastic hose 3 and cannot expand in the radial direction and restricts the expansion of the internal elastic hose 3 in the radial direction. And an outer protective cover 5 that is folded in a bellows shape in the direction and can be expanded and contracted in accordance with the expansion and contraction in the longitudinal direction of the internal elastic hose 3, and induces expansion in the longitudinal direction of the internal elastic hose 3. A stretchable double-layer watering hose having a heavy structure that can be automatically extended and contracted in the longitudinal direction by water pressure in the internal elastic hose 3,
Comprising a variable diameter joint 7 connected directly or indirectly to the faucet;
An end portion of the internal elastic hose 3 is covered with the external protective cover 5 while being fitted to the deformation joint 7 and temporarily fixed with a seal 10, and further covered with a pad cover 11 and fixed with a fixing member 9. Having a tightly fixed configuration,
Stretchable two-layer watering hose characterized by. The deformation joint 7 includes a hollow large-diameter portion 7B, a hollow small-diameter portion 7A communicating with the large-diameter portion 7B, and a hollow cylindrical portion 7D connecting the large-diameter portion 7B and the small-diameter portion 7A. Have
The end portion of the internal elastic hose 3, the end portion of the external protective cover 5, and the end portion of the seal 10 are in contact with the stepped portion located between the cylindrical portion 7D and the small diameter portion 7A.
End portions of the pad cover 11 and the fixing member 9 are in contact with a stepped portion located between the large diameter portion 7B and the cylindrical portion 7D;
The stretchable two-layer watering hose according to claim 1. The dimensions of the internal elastic hose 3 in a state where water pressure is not applied to the inside are 1 to 3 mm in thickness and 5 to 15 mm in inner diameter.
The dimensions of the internal elastic hose 3 in a state where water pressure is applied to the inside thereof are non-rupture resistant to a diameter of 16 to 30 mm, the caliber area can be expanded 4 to 5 times, and 2 to 2.5 in the longitudinal direction. Be double-stretchable,
The stretchable two-layer watering hose according to claim 1 or 2.