JP7477398B2 - Hose fitting clamp holder, hose fitting nipple and hose fitting - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. Date of sending: June 8, 2020, Kanematsu Engineering Co., Ltd.

The present invention relates to a clamping holder for a hose coupling, a nipple for a hose coupling, and a hose coupling.

For example, as shown in Patent Document 1, the applicant has disclosed a pipe end coupling joint having a spiral corrugated hose, a nipple inserted into the end of the hose, and a clamping holder for clamping the spiral corrugated hose with the nipple inserted. The nipple has a cylindrical part inserted into the pipe end at one axial end, a connecting part to another coupling at the other end, and an outer flange part protruding outward at the middle. The holder is composed of a split body divided into two along the axial direction, and has a spiral groove part along the outer circumferential surface of the spiral corrugated hose and an annular groove that fits with the outer flange part of the nipple on its inner circumferential surface. Because of this configuration, the pipe end coupling joint can prevent water leakage and hose rupture even if the internal pressure of the connected spiral corrugated hose becomes high, and can be used as a piping joint with high internal pressure.
Furthermore, the applicant has disclosed a hose fastener in which the holder is a 3- or 4-piece body for a large-diameter spirally corrugated hose, as shown in Patent Documents 2 and 3. By making the holder a 3- or 4-piece body in this way, it is possible to make the clamping force on the radially inner side uniform even for a large-diameter spirally corrugated hose.

JP 2000-074281 A Application No. 2019-011371 Application No. 2019-011372

In the midst of demands for even higher quality joint structures, the applicant discovered that the strength of the retaining wall (inner flange portion) at the tip side constituting the annular groove of the holder is weaker than other portions. For example, the applicant noticed that the retaining wall of the aluminum alloy holder may be deformed by applying a pressure much higher than the guaranteed pressure of the hose inside the corrugated spiral hose in the connected state. In particular, the applicant discovered that such deformation is more noticeable when the diameter of the corrugated spiral hose is increased.
In view of the above problems, the present application has an object to provide a clamping holder, a metal nipple, and a hose joint with improved pressure resistance.

The clamping holder of the present invention is a clamping holder for a hose fitting, which comprises a nipple to be inserted into the end of a spirally corrugated hose and a clamping holder that clamps the outer surface of the spirally corrugated hose with the nipple inserted therein, and has a cylindrical main body composed of a set of partitions divided into multiple parts in the circumferential direction, and a connecting portion on the outer periphery of the main body for joining each of the partitions, and the inner surface of the main body is provided with an inner flange portion provided to close the tip, a spiral groove, and a plurality of reinforcing ribs extending from the inner flange portion toward the spiral groove, and the partition is provided with at least one reinforcing rib.
In the clamping holder of the present invention, each divided body has a reinforcing rib extending from the inner flange portion, so that the clamping holder is less likely to deform or break even if the pressure inside the spiral corrugated hose becomes abnormally high.

In the fastening holder of the present invention, it is preferable that the reinforcing ribs are provided in a plurality at intervals in the circumferential direction on the inner surface of the divided body, in which case the strength is further improved.
In the clamping holder of the present invention, it is preferable that the main body is composed of a set of three or four divided bodies. In this case, the pressing force on the inside in the radial direction can be made uniform even for a corrugated spiral hose with a large diameter. In addition, the work at the site is not complicated.
In the clamping holder of the present invention, it is preferable that the outer diameter of the spirally corrugated hose is greater than 50 mm.
The clamping holder of the present invention is preferably made of a light metal, which allows the clamping holder to be light in weight and improves workability on site, particularly when the diameter is large.
A first embodiment of a hose coupling of the present invention is characterized by having the clamping holder of the present invention and a nipple to be inserted into the end of a spirally corrugated hose.

The nipple of the present invention is a nipple for a hose fitting comprising a nipple inserted into the end of a spirally corrugated hose and a clamping holder which clamps the outer surface of the spirally corrugated hose with the nipple inserted, and has a tubular portion inserted into the end of the spirally corrugated hose, a connection portion for connecting to another connector, and a locking portion provided on the outer surface of the base of the tubular portion, the locking portion being composed of a plurality of protrusions provided at intervals in the circumferential direction on the outer surface of the base of the tubular body.
In the nipple of the present invention, the locking portion is composed of a plurality of protrusions, and therefore, the efficiency of materials can be improved compared to a case in which the locking portion is provided around the entire circumference of the tubular portion. This is particularly noticeable when the diameter is large.
The nipple of the present invention is preferably made of metal.
A second aspect of the hose coupling of the present invention is characterized in that it comprises the nipple of the present invention and a clamping holder for clamping the outer circumferential surface of a spirally corrugated hose into which the nipple is inserted.

A third aspect of the hose coupling of the present invention is a hose coupling comprising a nipple to be inserted into the end of a spirally corrugated hose and a clamping holder for clamping the outer circumferential surface of the spirally corrugated hose into which the nipple is inserted, the nipple having a tubular portion to be inserted into the end of the spirally corrugated hose, a connection portion for connecting to another connector, and a locking portion provided on the outer circumferential surface of the base of the tubular portion, the locking portion being composed of a plurality of protrusions provided at intervals in the circumferential direction on the outer circumferential surface of the base of the tubular portion, the clamping holder having a tubular main body composed of a set of divided bodies divided into a plurality of parts in the circumferential direction and a connecting portion on the outer periphery of the main body for connecting the divided bodies to each other, the inner surface of the main body having an inner flange portion provided to close the tip, a spiral groove, and a plurality of reinforcing ribs extending from the inner flange portion toward the spiral groove, the divided body having at least one reinforcing rib. In the third aspect of the hose coupling, the protrusions of the nipple are located between the reinforcing ribs of the clamping holder.
In the third embodiment of the hose coupling of the present invention, it is preferable that the nipple can be rotated 5 to 45 degrees around the central axis before the clamping holder is clamped. By providing such a space, it is easy to adjust the positions of the nipple and the clamping holder when performing installation work on site. It is also easy to adjust the position when connecting the connection part of the nipple to another device.

The fastening holder of the present invention has reinforcing ribs extending from the inner flange of each divided body, so even if the inner flange receives an axial force, the inner flange does not deform and has high pressure resistance.

FIG. 1a is a cross-sectional view showing a state in which a hose coupling of the present invention is attached to a spiral corrugated hose, FIG. 1b is a perspective view showing the nipple, and FIG. 1c is a perspective view showing the clamping holder. 2a and 2b are a side view and a front view, respectively, of the nipple of FIG. 1b, and FIG. 2c is a side view showing a state in which a spiral corrugated hose is attached to the nipple. 3a and 3b are a front view and a side view, respectively, of the clamping holder of FIG. 1c, and FIGS. 3c and 3d are cross-sectional views taken along lines AA and BB, respectively. FIG. 4a is a cross-sectional view showing the relationship between the clamping holder and the nipple, and FIGS. 4b and 4c are cross-sectional views showing other embodiments of the clamping holder of the present invention. 5a and 5b are cross-sectional views showing other forms of the clamping holder, and FIG. 5c is a cross-sectional view showing the relationship between the clamping holder and a nipple. FIG. 6a is a cross-sectional view showing another embodiment of the clamping holder, and FIG. 6b is a cross-sectional view showing a state in which a hose joint using the clamping holder is attached to a spiral corrugated hose. FIG. 1C is a partial cross-sectional side view showing a connection state between a hose coupling and a corrugated spiral hose when the nipple of FIG. 1B is used with another conventionally known clamping holder.

Figure 1 shows the state in which the hose coupling 1 is attached to the spirally corrugated hose 10. The hose coupling 1 is equipped with a nipple 20 that is inserted into the end of the spirally corrugated hose 10, and a clamping holder 30 that clamps the outer surface of the spirally corrugated hose 10 with the nipple 20 inserted.

[Spiral corrugated hose 10]
First, a spiral corrugated hose 10 in which this hose coupling 1 is used will be described.
The spiral corrugated hose 10 has a synthetic resin hose body 11 and a spiral reinforcing core 12 attached to its outer periphery, and is flexible as a whole. The spiral corrugated hose 10 has an outer surface corrugated with alternating peaks (ridges) formed by the reinforcing core 12 and valleys formed by the hose body 11 in a spiral shape. The inner surface is smooth. However, minute irregularities may be formed on the inner surface.

The hose body 11 is formed by integrating a body inner layer 11a, a body outer layer 11b, and a reinforcing layer 11c provided therebetween.
The inner layer 11a is preferably made of a material having excellent abrasion resistance, for example, an abrasion-resistant thermosetting elastomer.
The outer body layer 11b is preferably made of a thermoplastic resin, for example soft polyvinyl chloride (PVC).
The reinforcing layer 11c is made of synthetic resin fibers in a mesh shape. An example of the synthetic resin fibers of the reinforcing layer 11c is twisted polyester yarn. The reinforcing layer 11c reduces the load on the hose body 11 when the internal pressure increases while maintaining the flexibility required for a hose used to transport fluids.
Such a hose body 11 can be manufactured, for example, by spirally winding a strip for the main body inner layer 11a formed by extrusion molding, providing a reinforcing layer 11c on top of that, winding a strip for the main body outer layer 11b also formed by extrusion molding on top of that, and welding them together.
However, the structure of the hose body 11 is not particularly limited as long as it has flexibility. For example, it may have a single layer, two layers, or four or more layers. The material may also be appropriately selected depending on the application.

The cross-sectional shape of the reinforcing core 12 forming the peaks (protrusions) of the spirally corrugated hose 10 is an arc on the outside and a rectangle on the inside.
The width W of the reinforcing core 12 is 3 to 20 mm, preferably 5 to 15 mm, and particularly preferably 8 to 12 mm.
The thermoplastic resin of the reinforcing core 12 is preferably a hard synthetic resin. Examples of the thermoplastic resin include hard polyvinyl chloride, hard polyolefins such as hard polyethylene and hard polypropylene, and polyesters such as polyethylene terephthalate. In particular, a material that has good adhesion when welded to the material of the outer layer of the hose body 11 is preferable, and a synthetic resin of the same quality is preferable. For example, when the outer layer of the hose body 11 is soft polyvinyl chloride (PVC), the reinforcing core 12 is preferably hard polyvinyl chloride. In order to strongly bond the reinforcing core 12 and the hose body 11, a pair of strips made of thermoplastic resin (particularly soft polyvinyl chloride) may be provided to cover the boundary line between the reinforcing core 12 and the hose body 11 on both sides.

The outer diameter X of the spirally corrugated hose 10 is 50 mm to 400 mm, preferably 90 mm or more, more preferably 120 mm or more, and particularly preferably 150 mm or more. The larger the outer diameter, the greater the effect of the hose coupling of the present invention.
The inner diameter Y of the spirally corrugated hose 10 is 30 to 380 mm, preferably 70 mm or more, more preferably 100 mm or more, and particularly preferably 120 mm or more.
The height h of the peaks of the spirally corrugated hose 10 is 3 to 20 mm, preferably 6 to 17 mm, and particularly preferably 8 to 13 mm.
The pitch of the ridges of the spiral corrugated hose 10 is 3 to 50 mm, preferably 10 mm or more, more preferably 15 mm or more, and particularly preferably 20 mm or more.
The pressure resistance of the spiral corrugated hose 10 at room temperature (23°C) is 2 MPa to 10 MPa, preferably 3 MPa or more, and particularly preferably 4 MPa or more. Here, the pressure resistance of the hose refers to the pressure that the spiral corrugated hose 10 can withstand for 5 minutes without bursting when a predetermined pressure is applied with the open end of the spiral corrugated hose 10 fixed closed with a metal fitting.

[Nipple 20]
As shown in FIG. 2a, the nipple 20 has a tubular portion 21 that is inserted into the end of the spiral corrugated hose 10, a connection portion 22 for connecting to another connector, and an annular engaging portion 23 provided on the outer circumferential surface of the base of the tubular portion 21.
The nipple 20 is molded from a rigid material such as steel, stainless steel or other metal.

The tubular portion 21 has a cylindrical shape with a tapered tip. The outer peripheral surface of the tubular portion 21 is smoothly flush. Although a periodic uneven shape may be formed, a smooth flush is preferable. The outer diameter of the tubular portion 21 is the same as or slightly smaller than the inner diameter Y of the corrugated spiral hose 10.
The connecting portion 22 has an inclined portion 22a whose diameter increases toward the rear, and a cylindrical expanding portion 22b. This connecting portion 22 is connected to another connecting body as a mounting fixture. Examples of such connecting bodies include mounting parts for various other devices and other hoses. The structure of the connecting portion 22 is appropriately selected depending on the connecting body to be connected.

The locking portion 23 is composed of a plurality of protrusions 23a protruding radially outward from the outer circumferential surface of the base of the cylindrical body. More specifically, as shown in Fig. 2b, six protrusions 23a are provided at equal intervals on the outer circumferential surface of the cylindrical body 21. However, the number is not particularly limited. It is preferable to have at least as many protrusions 23a as the number of corresponding divided bodies 30a of the fastening holder, and to provide each protrusion 23a so that it corresponds to the inner flange portion 36 of each divided body. As shown in Fig. 2c, when the nipple 20 is inserted into the corrugated hose 10, the locking portion 23 locks the tip of the corrugated hose 10 so that the nipple 20 is not inserted more than a predetermined amount.
The thickness (t) of the protrusion 23a in the axial direction is 6 to 20 mm, preferably 8 to 16 mm, and particularly preferably 10 to 12 mm.
The protrusion 23a is provided, for example, by cutting and welding a metal bar to the outer circumferential surface of the base end portion of the cylindrical portion 21. However, the nipple 20 may be integrally formed by using a die.
By providing the protrusions 23a at a predetermined interval in this way, it is possible to save material compared to providing them in an annular shape. If a continuous annular locking part is to be provided on an existing nipple that does not have a locking part, it is necessary to cut a flat plate into a donut shape to form a ring and weld the ring to the outer circumferential surface of the base of the cylindrical part, which increases the diameter and reduces the yield of materials. However, by welding while cutting the metal bar in this way, it is possible to improve the efficiency of materials even when providing a locking part by welding on an existing nipple that does not have a locking part.

[Fastening holder 30]
As shown in Figures 3a and 3b, the fastening holder 30 has a cylindrical main body 31 composed of a set of divided bodies 30a divided into three in the circumferential direction, and a connecting portion 32 for connecting the divided bodies to each other on the outer periphery of the main body. As shown in Figure 3d, the divided body 30a has at least one reinforcing rib 38 on its inner surface.
The clamping holder 30 is formed from a rigid material such as a light metal, such as aluminum, an aluminum alloy, or a titanium alloy, or a metal, such as stainless steel, but a light metal is preferable. An aluminum alloy is particularly preferable. By using a light metal, the clamping holder 30 can be made lighter, improving workability at the site. This effect becomes more noticeable the larger the diameter of the clamping holder 30.

As shown in FIG. 3c, the main body 31 has an inner flange 36 that closes its tip, a spiral groove 37 on its inner surface, and a number of reinforcing ribs 38 that extend from the inner flange 36 toward the spiral groove 37. An outer rib 31a is also formed on the outer circumferential surface of the main body 31 (see FIG. 3b).

The inner flange portion 36 engages the engaging portion 23 of the nipple 20. This prevents the nipple 20 from coming off when the fastening holder 30 is attached. The thickness of the inner flange portion 36 is 3 to 20 mm, preferably 5 to 15 mm, and particularly preferably 7 to 12 mm.
The spiral groove 37 accommodates the crests of the spiral corrugated hose 10. This allows for uniform pressure to be applied to the entire attachment portion of the spiral corrugated hose 10. The spiral groove 37 also acts to prevent the spiral corrugated hose 10 from coming loose due to an external force in the axial direction by engaging with the crests of the spiral corrugated hose 10.

As shown in FIG. 3c, the reinforcing rib 38 extends from the inner flange portion 36 toward the spiral groove 37 on the inner surface of the main body portion 31 in the axial direction of the fastening holder 30. That is, the reinforcing rib 38 is provided between the inner flange portion 36 and the spiral groove 37. As shown in FIG. 3d, a plurality of reinforcing ribs 38 are provided on the inner surface of the divided body 30a at intervals in the circumferential direction. More specifically, two reinforcing ribs 38 are provided at both ends of the divided body 30a in the circumferential direction and between them, for a total of four reinforcing ribs provided at intervals in the circumferential direction. When the divided bodies 30a are connected to each other, the reinforcing rib 38 at one end of the divided body 30a in the circumferential direction abuts against the reinforcing rib 38 at the other end of the adjacent divided body 30a in the circumferential direction. In this way, the plurality of reinforcing ribs 38 are arranged in a ring shape on the inner surface of the main body portion 31. The adjacent reinforcing ribs 38 form six recesses 38A of the same size at equal intervals. The recesses 38A arranged in this manner accommodate the protrusions 23a of the locking portion 23 of the nipple 20 when the fastening holder 30 is attached, as shown in Fig. 4a. Note that, here, one protrusion 23a is accommodated in one recess 38A, but multiple protrusions 23a may be accommodated in one recess 38A. The fastening holder 30 also has a small recess 38B formed by the adjacent reinforcing rib 38, but this has no relationship to the protrusion 23.
As shown by the angle α in Figure 4a, it is preferable to set the size of the recess 38A so that the nipple 20 can rotate 5 to 45 degrees, preferably 10 degrees or more, around the central axis of the hose coupling 1 when the nipple 20 and the fastening holder 30 are connected. By providing a space in the recess 38A between the reinforcing ribs 38 in this way, position adjustments are easy when performing installation work on site. Also, fine adjustments can be made when connecting the connection portion 22 of the nipple 20 to other devices.
The shape of the reinforcing rib 38 is not particularly limited, and the number and arrangement of the reinforcing rib 38 are not particularly limited, as long as the reinforcing rib 38 extends from the inner flange portion so as to have at least an axial component. For example, as shown in FIG. 4b, the radial length of the reinforcing rib 38 may be half that of the inner flange portion 36. However, it is preferable that the radial length of the reinforcing rib 38 is substantially the same as that of the inner flange portion 36. For example, as shown in FIG. 4c, one reinforcing rib 38 may be provided on each divided body 30a. The number of reinforcing ribs 38 provided on each divided body 30a is not particularly limited, but is 1 to 20, preferably 3 or more, and particularly preferably 4 or more. The number of recesses 38A provided on the main body portion 31 is also not particularly limited, but is 3 to 20, preferably 15 or less, and particularly preferably 10 or less.

Returning to FIG. 3, the connecting portion 32 has a mating portion 32a provided along the mating surface of the divided body of the main body 31, and a connector 32b that connects the mating portion 32a. The connector 32b is composed of a bolt 32b1, a nut 32b2, and a washer 32b3. Adjacent divided bodies 30a are connected by overlapping the mating portions 32a of the adjacent divided bodies, inserting a bolt 32b1 into the through holes of both mating portions 32a, and fixing them with a nut 32b2. However, the connecting portion 32 is not particularly limited as long as it can firmly connect the divided bodies. For example, a band may be firmly wrapped around the main body 31 to secure it.

Next, the installation of the hose joint 1 at the site will be described.
First, the nipple 20 is inserted into the spirally corrugated hose 10. At this time, the nipple 20 is inserted until the end of the spirally corrugated hose 10 comes into contact with the engaging portion 23 of the nipple 20 (see FIG. 2c).
Next, the clamping holder 30 is placed over the spiral corrugated hose 10 with the nipple 20 inserted therein. At this time, the peaks of the spiral corrugated hose 10 are accommodated in the spiral grooves of the clamping holder 30, and each protrusion 23a of the locking portion 23 of the nipple 20 is positioned between the reinforcing ribs 38 of the clamping holder 30. Then, the connecting portion 32 of the clamping holder 30 is lightly connected. As shown in FIG. 4a, the nipple 20 can be rotated 5 to 45 degrees, preferably 10 degrees, around the central axis, so that the nipple 20 and the clamping holder 30 can be easily aligned. Furthermore, when the connecting portion 22 of the nipple 20 is connected to another connecting body in this state, the nipple 20 can be moved, so fine adjustment can be performed.
After adjusting the nipple 20 and the clamping holder 30, the connecting portion 32 of the clamping holder 30 can be tightly fastened and fixed, thereby firmly connecting the spiral corrugated hose 10 and the nipple 20.

Because of this configuration, the hose coupling 1 is less likely to deform or break after being attached to the spirally corrugated hose 10, even if the internal pressure of the spirally corrugated hose 10 becomes abnormally high. In particular, because the reinforcing ribs 38 are formed on the inner flange portion 36 of the tightening holder 30, the inner flange portion 36 does not deform in the axial direction. Such a hose coupling 1 is preferable as a coupling for a spirally corrugated hose with a large outer diameter.

The clamping holder 30A in Figures 5a and 5b has a main body 31 composed of four divided bodies 30a. In this clamping holder 30A, each divided body 30a has three reinforcing ribs 38, and the main body 31 has eight recesses 38A provided at equal intervals. Figure 5c is a cross-sectional view of the clamping holder 30A connected to the nipple 20A. Such a clamping holder 30A is preferably used for a spiral corrugated hose 10 having an outer diameter X of 150 mm or more, further 180 mm or more, and particularly 200 mm or more.
In this way, the main body is not particularly limited as long as it can be divided into a plurality of parts, and may be divided into two parts, or five or more parts. The other configurations are substantially the same as those of the fastening holder 30 in FIG.

The clamping holder 30B in Fig. 6a has an annular groove 39 formed between the reinforcing rib 38 and the spiral groove 37. As shown in Fig. 6b, this clamping holder 30B can be connected to a nipple 50 having a conventional continuous annular engaging portion 51 formed therein. In other words, the annular engaging portion 51 is accommodated in the annular groove 39. Although the outer dimensions are larger than those of the clamping holder 30 in Fig. 3, like the clamping holder 30 in Fig. 1, it is less likely to deform or break even if the internal pressure of the spiral corrugated hose 10 becomes abnormally high.

Figure 7 shows the nipple 20 of Figure 2 connected to a clamping holder 60 that does not have a reinforcing rib. In this way, the nipple 20 can be used with holders that do not have reinforcing ribs other than the clamping holder of the present invention.

[Example]
A spirally corrugated hose 10 (nominal diameter 125) having an inner diameter of 127 mm, an outer diameter of 159.5 mm, and a pitch of 22 mm was prepared, and a hose fitting 1 consisting of an iron nipple 20 and an aluminum tightening holder 30 corresponding to this spirally corrugated hose 10 of nominal diameter 125 was prepared.
"Comparative Example"
A hose coupling was prepared, which consisted of a conventionally known iron nipple 50 (nipple 50 in FIG. 6 ) formed with a continuous annular engaging portion 51 corresponding to a spirally corrugated hose 1 having a nominal diameter of 125, and a conventionally known aluminum clamping holder 60 (clamping holder 60 in FIG. 7 ) of the same shape but without the reinforcing rib 38.

A spirally corrugated hose 10 was attached to the hose joints of the examples and comparative examples, and normal temperature water at 23° C. was circulated at 4 MPa for 2 minutes in an environment of a temperature of 23° C. and a humidity of 50%.
The hose coupling of the comparative example did not break, but the inner flange of the clamping holder was clearly distorted and could not withstand repeated use. On the other hand, the hose coupling of the example did not distort even when high pressure was applied.

LIST OF SYMBOLS 1 hose coupling 10 spirally corrugated hose 11 hose body 11a body inner layer 11b body outer layer 11c reinforcing layer 12 reinforcing core 20 nipple 21 tubular portion 22 connection portion 22a inclined portion 22b enlarged diameter portion 23 engaging portion 23a protrusion 30 fastening holder 30A fastening holder 30B fastening holder 30a divided body 31 body portion 31a outer rib 32 connecting portion 32a mating portion 32b connecting tool 32b1 bolt 32b2 nut 32b3 washer 36 inner flange portion 37 spiral groove 38 reinforcing rib 38A recess 38B small recess 39 annular groove 50 nipple 51 engaging portion 60 fastening holder

Claims (11)

A clamping holder for a hose joint, comprising a nipple to be inserted into the end of a spirally corrugated hose and a clamping holder for clamping the outer circumferential surface of the spirally corrugated hose into which the nipple is inserted,
The rotor includes a cylindrical main body portion including a set of divided bodies divided into a plurality of parts in a circumferential direction, and a connecting portion for connecting the divided bodies to each other on an outer periphery of the main body portion.
The inner surface of the main body is provided with an inner flange portion provided to close the tip of the main body, a spiral groove, and a plurality of reinforcing ribs extending from the inner flange portion toward the spiral groove,
Each of the segments includes at least one of the reinforcing ribs.
Fastening holder. The reinforcing ribs are provided on the inner surface of the partition body at intervals in the circumferential direction.
The clamping holder according to claim 1. The main body is composed of a set of divided bodies divided into three or four parts.
3. The clamping holder according to claim 1 or 2. The outer diameter of the spiral corrugated hose is greater than 50 mm.
3. The clamping holder according to claim 1 or 2. It is made of light metal,
A clamping holder according to any one of claims 1 to 4. A clamping holder according to any one of claims 1 to 5, and a nipple to be inserted into an end of a spiral corrugated hose.
Fittings for hoses. A nipple for a hose coupling comprising a nipple to be inserted into an end of a spirally corrugated hose and a clamping holder for clamping the outer circumferential surface of the spirally corrugated hose into which the nipple is inserted,
A cylindrical portion to be inserted into the end of the spiral corrugated hose;
A connection portion for connecting to another connection body;
a locking portion provided on an outer circumferential surface of a base portion of the cylindrical portion for locking an inner flange portion of the fastening holder ,
The locking portion is composed of a plurality of protrusions provided at intervals in the circumferential direction on the outer circumferential surface of the base of the cylindrical portion .
nipple. It is made of metal,
The nipple according to claim 7. A device comprising the nipple according to claim 7 or 8 and a clamping holder for clamping an outer circumferential surface of a spiral corrugated hose into which the nipple is inserted.
Fittings for hoses. A hose joint comprising a nipple to be inserted into the end of a spirally corrugated hose and a clamping holder for clamping the outer circumferential surface of the spirally corrugated hose into which the nipple is inserted,
The nipple has a cylindrical portion inserted into the end of the spiral corrugated hose, a connection portion for connecting to another connector, and a locking portion provided on the outer circumferential surface of a base of the cylindrical portion for locking an inner flange portion of the fastening holder ,
The locking portion is composed of a plurality of protrusions provided at intervals in a circumferential direction on an outer circumferential surface of a base of the cylindrical portion ,
The fastening holder has a cylindrical main body portion composed of a set of divided bodies divided into a plurality of parts in a circumferential direction, and a connecting portion for connecting the divided bodies to each other on an outer periphery of the main body portion,
The inner surface of the main body portion includes an inner flange portion provided to close a tip end of the main body portion, a spiral groove, and a plurality of reinforcing ribs extending from the inner flange portion toward the spiral groove,
Each of the segments includes at least one of the reinforcing ribs.
Fittings for hoses. In a state before the fastening holder is fastened,
The nipple can be rotated 5 to 45 degrees around the central axis.
A hose coupling according to claim 10.

Images