JPH10246374A - Connection structure of spiral reinforcing hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slip off of a hose completely by shrinking a diameter of a spiral of a reinforcing wire material while twisting a tube by a hose part removed from a connection member when the connection member is turned in the direction in which it is pulled out from a reinforcing hose and increasing tightening force of the reinforcing hose on the connection member due to diameter shrinkage force. SOLUTION: When adhesive is applied on a surface of a pipe part 13 of a connection member 11 and this pipe part 13 is fitted into a reinforcing hose H and is screwed and turned, a screw thread 15 of the pipe part 13 is screwed in along a pitch of a reinforcing wire material 18 so that a tube 17 is pulled and elongated in the direction of its diameter. Next, when the pipe part 13 is sequentially screwed into the reinforcing hose H and is further screwed in from a condition in which a tip part of the hose H comes into contact with a flange 12, the reinforcing hose H is also fed into the pipe part 13. Since there is an interval L in which a screw thread 15 is not formed in the pipe part 13, however, the reinforcing hose H is compressed in the axial direction due to this interval L part and tightening force of the reinforcing wire material 18 in the interval L is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a reinforcing hose and a connecting member such as a nipple.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 8-1 discloses this type of connection structure.
No. 70771 has been known. FIG. 8 shows this conventional structure. In this conventional connection structure, a helical tube 4 having a helical protrusion 3 formed on the surface is fixed to the outer periphery of the tube portion 2 of the connection member 1. The hose 5 fitted into the spiral cylinder 4 has a reinforcing member 6 spirally embedded therein. The pitch of the reinforcing members 6 is substantially the same as the pitch of the projections 3 of the spiral cylinder 4.

When the connection member 1 and the hose 5 are fitted, the tube 2 of the connection member 1 is screwed into the hose 5. When the cylinder 2 is screwed into the hose 5 in this manner, the projection 3 of the spiral cylinder 4 fitted in the cylinder 2 engages with the reinforcing member 6 and advances by the pitch. The fitted connection member 1 is not easily pulled out even if it is turned in the opposite direction. This is because, when the connection member 1 is turned in a direction in which the connection member 1 is pulled out, a diameter reducing force acts on the helical reinforcing member 5 of the portion fitted to the connection member 1.

[0004]

In the conventional connection structure as described above, when the connection member 1 is turned in the pulling direction,
Although a force in the direction of reducing the diameter acts on the reinforcing member 6, the effect of the force is not always sufficient. This is because the reinforcement 6 is directly embedded in the hose 5, so the flexibility of the hose itself is lost, which prevents the reinforcement 6 from being reduced in diameter.
Further, in this conventional connection structure, the fastening force of the hose 5 to the connection member 1 is not sufficient. Therefore, a coupling, a band, or the like is actually put on the hose to prevent the hose from coming off or leaking. In other words, this conventional structure has a problem in that a separate member is required in order to surely prevent the falling-off and the water leakage. An object of the present invention is to completely prevent the hose from coming off,
An object of the present invention is to provide a connection structure that does not leak water.

[0005]

According to a first aspect of the present invention, a reinforcing hose comprises a tube having both torsion and elasticity, and a reinforcing wire wound spirally around the outer periphery of the tube. The connecting member is formed with a thread having substantially the same pitch as the spiral of the reinforcing wire. In addition, the connecting member has a screw thread outer diameter larger than the tube inner diameter, and when the connecting member is screwed into the reinforcing hose, the screw thread of the connecting member enters while extending the tube. On the other hand, when the connecting member is rotated in a direction in which the connecting member is pulled out of the tube, the tube other than the portion screwed into the connecting member is twisted to reduce the spiral diameter of the reinforcing wire.

According to the first aspect of the present invention, when the connecting member is turned in a direction in which the connecting member is pulled out of the reinforcing hose, the hose portion disengaged from the connecting member twists the tube and forms a spiral of the reinforcing wire. To reduce the diameter. Since this diameter reducing force is also transmitted to the reinforcing wire rod of the reinforcing hose into which the connecting member is inserted, the diameter reducing force at that portion is further increased.
Therefore, the tightening force of the reinforcing hose on the connecting member is also increased.

According to a second aspect of the present invention, a reinforcing hose is spirally wound around the outer periphery of a tube having elasticity so as to be contractable in the axial direction. On the other hand, the connecting member has a hose abutting surface formed of a flange and the like, and a continuous pipe portion is formed from the hose abutting surface, and a thread having substantially the same pitch as the spiral of the reinforcing wire is formed on the pipe portion. Has formed. In addition, a predetermined space is provided between the end of the thread and the end surface of the hose, and the pipe portion of the connecting member is screwed into the hose. Are compressed in the axial direction.

According to the second invention, the spiral reinforcing wire is axially compressed between the hose abutting surface and the thread end, so that the tightening force per unit area in the compressed portion is extremely strong. Become.

According to a third aspect of the present invention, a reinforcing hose is spirally wound around the outer periphery of a tube having torsion and elasticity so as to be contractable in the axial direction. On the other hand, the connecting member has a hose abutting surface formed of a flange or the like, and a thread having substantially the same pitch as the spiral of the reinforcing wire is formed in a pipe portion continuous from the hose abutting surface. In addition, a predetermined interval is provided between the end of the thread and the end face of the hose.
And, when the thread diameter of the connection member is made larger than the inside diameter of the tube, and the connection member is screwed into the reinforcing hose, the thread of the connection member enters while stretching the tube, and the connection between the hose abutting surface and the thread end is formed. While the spiral reinforcing wire is compressed in the axial direction, when the connecting member is rotated in the direction of pulling out of the tube, the tube other than the portion screwed into the connecting portion is twisted to reduce the spiral diameter of the reinforcing wire. It has a configuration. According to a fourth aspect of the present invention, a sealing material is embedded in the pipe peripheral surface between the hose abutting surface of the connecting member and the thread end.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment shown in FIGS. 1 to 5, a flange 12 is formed on a connecting member 11, one of which is a pipe portion 13 with the flange as a boundary, and the other is a device connection. The section 14. The device connection unit 14 is for connecting to a not-shown washing machine or the like.

The pipe portion 13 has a thread 15 formed on the outer periphery thereof. And this thread 15
Is formed from the tip of the pipe portion 13 on the side opposite to the flange 12 toward the flange 12 as shown in FIG. 1, and a gap L is provided between the flange 12 and the end of the screw thread 15. ing. In other words, a range L where the thread 15 is not formed is maintained in the pipe portion 13. A sealing material 16 is embedded in the range L of the pipe portion 13 as described above so as to be adjacent to the flange 12. However, the surface of the sealing material 16 is exposed on the surface of the pipe portion 13, but the exposed surface may be flush with the surface of the pipe portion 13 or may be slightly raised.

The reinforcing hose H is formed by spirally winding a synthetic resin reinforcing wire 18 around an outer periphery of a synthetic resin tube 17 having both torsion and elasticity. The helical pitch of the reinforcing wire 18 is substantially the same as the pitch of the thread 15. In addition, this tube 17
As shown in (2), between the pitches of the reinforcing wire rod 18, a state of being slightly swelled outward is maintained.

Since the tube 17 is slightly expanded between the pitches of the reinforcing wires 18 as described above, when the reinforcing hose H is compressed in the axial direction as shown in FIG. 3, for example, the tube 17 is bent outward. Between the pitches of the reinforcing wire 18. If there is no bulge, when the reinforcing hose H is compressed in the axial direction, the tube 1
The bending direction of 7 becomes inconsistent. Therefore, the tube 17 may sink under the contracted portion of the reinforcing wire 18 in the state of FIG. Thus, tube 1
If 7 is sunk, the sunk part will be damaged. However, if the tube 17 is swelled as in this embodiment, it does not dive under the contracted portion of the reinforcing wire 18.

The outer diameter of the thread 15 of the pipe 13 is larger than the inner diameter of the tube 17.
In this way, when the pipe portion 13 is screwed into the tube 17, the thread 15 and the inner peripheral surface of the tube 17 are in close contact with each other, so that a sealing effect is obtained. However, in this case, a gap may be generated between the screw groove 23 and the inner periphery of the tube 17. Therefore, it is ideally desirable that the outer shape of the screw groove 23 be larger than the inner diameter of the tube 17. With this configuration, not only the screw thread 15 but also the screw groove 23 is in close contact with the inner peripheral surface of the tube 17, so that a higher sealing effect can be obtained.

Next, the operation of the first embodiment will be described.
FIG. 4 shows the reinforcing wire 18, and reference numeral 22 in FIG.
Correspond to the reinforcing wire end 22 in FIG. When an adhesive is applied to the surface of the pipe portion 13 of the connecting member 11 and the pipe portion 13 is attached to the reinforcing hose H and the pipe portion 13 is turned in the direction of arrow 19 in FIG. Are screwed along the pitch of the reinforcing wire 18. At this time, the slightly bulged tube 17 is further stretched in the diameter direction by the thread 15. In other words, the thread 15 is held to some extent by the diametrical extension force of the tube 17. Further, by screwing the pipe portion 13, the adhesive is uniformly applied to the entire connection portion. It is desirable to use an uncured elastic adhesive such as a sealing material or a caulking material as the adhesive.

When the pipe portion 13 is further screwed into the reinforcing hose H as described above, the tip of the hose H first strikes the flange 12. When the pipe portion 13 is further screwed into the hose H from this abutted state, the reinforcing hose H is also fed into the pipe portion 13 more and more. However, the pipe section 13 has a thread 1
Since there is an interval L where no 5 is formed, at this interval L, the reinforcing hose H is compressed in the axial direction as shown in FIG. When the reinforcing hose H is compressed in the above-described interval L, the tightening force of the reinforcing wire 18 in the interval L increases.

Moreover, since the sealing material 16 is embedded in the range of the distance L, the reinforcing wire 18 is more strongly pressed against the sealing material 16. In other words, the sealing force at this portion is increased. Therefore, water does not leak from between the pipe portion 13 and the reinforcing hose H. In addition, the reinforcing hose H cannot be removed because of the increase in the pressure.

On the other hand, as shown in FIG. 6, a cap 24 may be put on the outer periphery of the pipe portion 13. In this way, the outer peripheral surface of the reinforcing hose H is also sealed by the adhesive that protrudes from the inner surface of the cap 24 when the pipe portion 13 is screwed. Therefore, higher airtightness can be obtained. Further, since the reinforcing hose H screwed into the pipe portion 13 can be prevented from expanding in the radial direction by the fluid pressure by the cap 24, no water leaks from between the pipe portion 13 and the reinforcing hose H. . Further, by covering the cap 24, the connection portion of the reinforcing hose H is hidden, so that the appearance is improved. The surface of the flange 12 on the side of the pipe portion 13 constitutes the end surface of the present invention.

In the above state, the twisted reinforcing hose H not inserted into the connecting member 11 cannot be pulled out from the connecting member 11 even if the hose H is pulled out of the connecting member 11, but for the following reason. That is, the reinforcing wire 18
As shown in FIG. 4, the helical diameter increases when twisted in the direction of arrow 19 and decreases when twisted in the direction of arrow 20. When the reinforcing hose H is turned in the direction of pulling out from the connecting member 11 as described above, a force acts on the reinforcing wire 18 in the direction of the arrow 20. Therefore, at that time, the spiral diameter is reduced.

With the reinforcing hose H connected to the connecting member 11, the connecting member 11 and the reinforcing hose H detached therefrom are connected.
Are relatively rotated in the direction in which the connection member 11 is pulled out, as follows. That is, as shown in FIG. 5, for the portion H ₁ that is fitted to the connecting member 11, the spiral diameter of the portion H ₂ deviated from the connecting member 11 is reduced. The principle of the reduction of the spiral diameter is as described with reference to FIG.
When partial H ₂ as described above is reduced in diameter, the force to its Chijimaro also acts on the reinforcing wire 18 in the portion H _1. Therefore, the tightening force of the portion H ₁ is further increased, and the reinforcing hose H does not come off from the connection member 11.

If the reinforcing member 6 is directly buried in the hose 5 as in the prior art, the hose 5 has rigidity but loses torsion. If the hose 5 loses the twisting property, the hose 5 in the portion deviated from the connecting member 1
Cannot be reduced in diameter. Therefore, even if the connecting member 1 is turned in a direction in which the connecting member 1 is pulled out, a diameter reducing force of a portion separated from the connecting member 1 does not occur. To the extent that the diameter reducing force is not generated, the detachment preventing force is smaller than in the above embodiment.

Next, a second embodiment is shown in FIG. This second
In this embodiment, the outer circumference of the reinforcing hose H of the first embodiment is covered by an outer tube 21. The outer tube 21 is made of the same material as the tube 17, and the outer tube 21 is bonded to the tube 17 between the reinforcing wires 18 at the pitch. In this manner, the reinforcing wire 18 can be fixed by being sandwiched between the tube 17 and the outer tube 21.

Generally, the bonding strength of the same material is higher than that of different materials. In addition, different materials may not be adhered depending on the material. In the second embodiment, the outer layer tube 21 and the tube 17 are made of the same material to increase the adhesive strength. If the adhesive strength is strong, the reinforcing wire 18
If the outer tube 21 cannot be adhered to the tube 17,
The reinforcing wire 18 can be fixed by sandwiching the reinforcing wire 18 with the tube 17. Therefore, the material of the reinforcing wire 18 can be selected regardless of the material of the tube 17. For example, a reinforcing wire 18 made of polypropylene of a different material can be used for the tube 17 of vinyl chloride.
As described above, since the reinforcing wire 18 can be selected regardless of the material, the strength of the reinforcing hose H can be freely set. In addition,
Also in the second embodiment, a high sealing effect can be obtained by covering the outer periphery of the pipe member 13 with the cap 24 as described above.

[0024]

According to the connection structure of the first aspect of the invention, when the connecting member is turned in a direction in which the connecting member is pulled out of the reinforcing hose, the diameter of the portion of the hose separated from the connecting member is reduced. This further prevents the connection member from coming off. Second
According to the connection structure of the invention, when the reinforcing hose is screwed into the connecting member, the hose distal end portion is compressed in the axial direction, so that the tightening force is further increased by the action of the reinforcing wire at the compressed portion. Therefore, the connection member hardly comes off the hose. In addition, as the tightening force is increased, the sealing property is improved, and the leakage of the fluid in the reinforcing hose can be prevented.

According to the connection structure of the third invention, the first structure
The diameter reducing force according to the second aspect of the invention and the tightening force according to the second aspect of the present invention combine with each other, so that a stronger tightening can be performed, and the connecting member cannot be further removed from the reinforcing hose. According to the connection structure of the fourth aspect of the present invention, since the sealing material is provided at the location where the compressed reinforcing wire is concentrated, the compressive force on the sealing material is also increased, and the leakage of the fluid in the reinforcing hose can be prevented accordingly. .

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a connection member.

FIG. 2 is a partial sectional view of a reinforcing hose.

FIG. 3 is a partial cross-sectional view showing a state in which a reinforcing hose is fitted to a connection member.

FIG. 4 is a perspective view of a state in which a reinforcing wire is spirally wound.

FIG. 5 is a side view of a main part showing a situation when the connecting member is turned in a direction to pull out from the reinforcing hose.

FIG. 6 is a partial cross-sectional view showing a state where a cap is placed on the connection member.

FIG. 7 is a partial cross-sectional view of a state in which the outer periphery of a reinforcing hose is covered with an outer tube.

FIG. 8 is a partial cross-sectional view showing a main part of a conventional connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Connection member 12 Flange which functions as a butting surface 13 Pipe part 15 Thread L Interval 16 Seal material 17 Tube 18 Reinforcement wire

Claims (4)

[Claims] The reinforcing hose comprises a tube having twistability and elasticity and a reinforcing wire wound spirally around the outer periphery of the tube, and the connecting member has a pitch substantially the same as the spiral of the reinforcing wire. When the connection member is screwed into the reinforcing hose, the connection member thread enters while extending the tube when the connection member is screwed into the reinforcing hose. On the other hand, when the connecting member is rotated in a direction in which the connecting member is pulled out of the tube, a tube other than the portion screwed into the connecting member is twisted to reduce the helical diameter of the reinforcing wire rod. 2. The reinforcing hose is formed by spirally winding a reinforcing wire around an outer periphery of a tube having elasticity so as to be contractable in an axial direction, while a connecting member has a hose abutting surface formed of a flange or the like. A continuous pipe portion is formed from the hose abutting surface, and a thread having substantially the same pitch as the helix of the reinforcing wire is formed in the pipe portion, and a predetermined distance is formed between the end of the thread and the hose abutting surface. The connection structure of a reinforcing hose in which a spiral reinforcing wire is axially compressed between a hose abutting surface and a thread end by screwing a pipe portion of a connecting member into a hose. 3. A reinforcing hose is formed by spirally winding a reinforcing wire around the outer periphery of a tube having torsion and elasticity so as to be contractable in the axial direction, while the connecting member has a hose abutting surface made of a flange or the like. In addition to the above, a thread having substantially the same pitch as the spiral of the reinforcing wire is formed in a pipe portion continuous with the hose abutting surface, and a predetermined interval is provided between the end of the thread and the hose abutting surface. When the connection member is screwed into the reinforcing hose, the connection member thread enters while expanding the tube, and the hose abutment surface and the screw thread are formed. While the spiral reinforcing wire is compressed in the axial direction between the terminal and the terminal, when the connecting member is rotated in the direction of pulling out of the tube, it is screwed into the connecting portion. The connecting structure of the reinforcing hose is configured so that the tube other than the bent portion is twisted to reduce the spiral diameter of the reinforcing wire. 4. The connection structure for a reinforcing hose according to claim 2, wherein a sealing material is embedded in the peripheral surface of the pipe portion between the hose abutting surface of the connecting member and the thread end.