JP4100810B2 - Fitting for flexible tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fitting for a flexible tube, for a flexible tube which is configured particularly at Korugeito tube used like gas piping, to fittings for flexible tube.
[0002]
[Prior art]
As a conventional joint for this type of flexible tube, the tip of the metal tubular body having an abutting surface inside and the flexible tube from which the covering of the tip of the corrugate tube has been removed are inserted. A metal push ring whose part is screwed into the inside of the cylindrical main body, and a metal push ring that is attached to the tip of the push ring and that can engage with a valley portion on the outer periphery of the corrugate tube of the flexible tube inserted through the push ring For example, Japanese Patent Application Laid-Open No. 8-159350 discloses a device including a retainer having a plurality of protrusions.
[0003]
In such a flexible tube joint, by inserting the flexible tube into the press ring with the press ring loosely screwed to the cylindrical main body, the crest at the tip of the flexible tube causes the protrusion of the retainer to be inserted. It passes through the position of this protrusion. As a result, the retainer protrusion engages with the valley of the corrugate tube while the tip of the corrugate tube protrudes a predetermined amount from the tip of the retainer. The distal end portion of the tube can be crushed in a close contact state between the protrusion of the retainer and the contact surface of the cylindrical main body.
[0004]
As a result, the flexible tube is connected to the joint in a sealed state, and the distal end portion of the corrugate tube is sandwiched between the protrusion of the retainer and the contact surface of the cylindrical main body, so that the corrugate tube can be prevented from coming out. There is also an effect.
[0005]
[Problems to be solved by the invention]
However, in the joint described in Japanese Patent Application Laid-Open No. 8-159350, as described above, after inserting the flexible tube, it is necessary to further screw the press ring, and the tip portion of the corrugate tube must be crushed by the screwing. Therefore, there is a problem that a relatively large force is required.
[0006]
Therefore, the present invention aims to solve such problems and to join these joints and tubes only by inserting a flexible tube into the joint.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the present invention comprises a cylindrical main body and a push ring whose tip is inserted into the cylindrical main body, and the flexible tube has a corrugated tube from the end of the push ring. It can be inserted into the inside of the press ring and the cylindrical main body, and a taper surface having a diameter increasing toward the tip end side of the press ring is formed on the inner periphery of the press ring. An annular retainer is disposed, the retainer having a tapered outer peripheral surface that can contact the tapered surface, and a projecting portion projecting radially inward, and the retainer has one end having a projecting portion. the tapered with cuts from the side in the axial direction formed in a direction toward the other side along with provided a plurality of positions in the circumferential direction, the other end portion wherein the cut is not et provided is circumferentially continuous The outer periphery is shaved compared to the outer surface It was that are configured as thin-walled portion, when the flexible tube is inserted, allowing the passage of the crests by the projections are pushed open by the crests of the outer periphery of Korugeito tube, and the ridges The protrusion is deformable so as to engage with the valley of the outer periphery of the corrugate tube by passing the wire, and on the outer periphery of the retainer, the protrusion of the retainer can be biased in a reduced diameter state with a wire rod A formed ring-shaped spring is mounted, and when the flexible tube is inserted and the protrusion of the retainer is pushed and expanded by the crest of the outer periphery of the corrugate tube, the springs have the ends in the circumferential direction of the wire rod. The length of the projections formed by a pair of adjacent cuts is not longer than the circumferential width.
[0008]
With such a configuration, the flexible tube and the joint can be securely joined to each other in a sealed state by simply inserting the flexible tube into the joint without any other operations such as screwing the member. Will be. In addition, when a pull-out force from the joint acts on the flexible tube, the outer peripheral surface of the retainer is pressed against the inner tapered surface of the pusher wheel, and the reaction force causes a radially inward force on the protrusion. Since the force acts on the retainer by this force, the protrusion is strongly engaged with the trough portion of the corrugate tube, so that the withdrawal is prevented.
[0009]
When inserting the corrugate tube of the flexible tube into the joint, the annular retainer is provided with a plurality of axial notches formed from the protrusion side at a plurality of positions in the circumferential direction. However, it is easily expanded by the crests on the outer periphery of the corrugate tube. In addition, the ring-shaped spring is formed by a pair of adjacent incisions between the circumferential ends of the wire rod when the protrusion of the retainer is pushed and expanded by the crest of the outer periphery of the corrugate tube when the flexible tube is inserted. Since it is configured with a length that does not open more than the circumferential width of one formed protrusion, the end of the spring in the circumferential direction when the protrusion is expanded like in the case of not having such a length The occurrence of an accident in which one protrusion fits between each other is reliably prevented. If the protrusions are caught between the end portions in the circumferential direction of the spring in this way, the spring cannot be reduced in diameter after the peak portion of the corrugate tube passes through the protrusion, and therefore the protrusion cannot be reduced in diameter. However, according to the present invention, since such a situation is prevented, the protrusion can be reliably reduced in diameter by this spring and can be engaged with the valley on the outer periphery of the corrugate tube.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 1 denotes a flexible tube, which is composed of a thin stainless corrugate tube 2 and a resin tube-like covering 3 that covers the outer periphery of the corrugate tube 2. In the corgate pipe 2, 4 is a peak and 5 is a valley. The flexible tube 1 is connected to the joint in a state in which the covering 3 is removed for several piles at the tip of the corrugate tube 2.
[0011]
In this joint, reference numeral 11 denotes a cylindrical body, which is formed of a metal such as brass, and has an external thread portion 12 formed at one end thereof, so that it can be connected to a connected body such as a gas pipe. ing. A hexagonal portion 13 is used for screwing the outer screw portion 12.
On the inner circumference on the other end side of the cylindrical main body 11, an inner screw portion 15, an inner circumferential surface 16, an annular seal material accommodation portion 17, and a corrugate tube accommodation portion 18 are provided in this order from the opening side. ing. The corrugate tube accommodating portion 18 is formed to have a diameter smaller than that of the seal material accommodating portion 17 and the same as or slightly larger than the outer diameter of the corgate tube 2, so that the peak portion 4 at the tip of the corgate tube 2 can be accommodated without a large gap. It is configured. An annular rubber sealing material 21 is accommodated in the sealing material accommodating portion 17 in a loose press-fit state. The sealing material 21 is configured by a cylindrical body in which a ring-shaped fireproof portion 56 and a general rubber portion 57 are integrated in the axial direction, and the fireproof portion 56 is disposed on the back side of the tubular main body 11. Has been.
[0012]
Reference numeral 25 denotes a push wheel which is formed into a cylindrical shape from a metal such as brass, and has an external thread portion 26 which can be screwed into the internal thread portion 15 of the tubular main body 11 at one end thereof. An outer peripheral surface 27 is formed on the outer periphery on the other end side of the press wheel 25. The outer peripheral surface 27 is formed to have a larger diameter than the outer screw portion 26.
A hole 33 through which the flexible tube 1 is inserted is formed in the pusher wheel 25 in a penetrating state. A packing 34 is accommodated in the inner periphery of the hole 33 at the other end of the pusher wheel 25. A tapered surface 37 is formed on the inner periphery of one end portion of the pusher wheel 25 in the hole 33 so as to increase in diameter toward one end side of the pusher wheel 25. The tapered surface 37 is formed to have substantially the same diameter as the packing accommodating portion 17 of the cylindrical main body 11 on one end side, that is, the opening side of the pusher wheel 25.
[0013]
As shown in FIG. 1, in a state where the presser wheel 25 is screwed into the cylindrical main body 11, the inner peripheral surface 16 of the presser wheel 25, the inner peripheral surface 16 of the cylindrical main body 11, and the end surface of the sealing material 21 are surrounded. A space 39 is formed. An annular retainer 44 is disposed in the space 39. As shown in FIGS. 1 to 4, the retainer 44 is made of a metal material such as brass, and a radially inward protruding portion 45 is formed on one end side thereof, that is, on the opening side of the pusher wheel 25. The protrusion 45 is formed so that the inner diameter thereof is smaller than the outer diameter of the peak portion 4 of the corgate pipe 2 and equal to or larger than the outer diameter of the valley portion 5. Similarly, the thickness of the protrusion 45 along the axial direction is smaller than the width of the valley portion 5 of the corrugate tube 2 along the axial direction, and is formed to have a dimension, for example, about half of the width. A tapered surface 46 that gradually increases in diameter toward the back side of the push wheel 25 is formed on the inner periphery of the inner side of the protrusion 45 on the back side of the push wheel 25. Further, an outer peripheral tapered surface 47 having an inclination in the same direction as the tapered surface 37 of the push wheel 25 is formed on the outer periphery on the other end side of the retainer 44. However, the angles of the two tapered surfaces 37 and 47 may be equal or may be different to some extent.
[0014]
Further, the retainer 44 is formed with notches 48 in the axial direction from the one end side having the protrusions 45 toward the other end side at a plurality of positions in the circumferential direction. The notch 48 reaches a position just before the other end of the retainer 44, and the retainer 44 is configured to be continuous in the circumferential direction only at the other end where the notch 48 is not formed. The continuous portion in the circumferential direction is formed as a thin portion 49 whose outer peripheral portion is cut away as compared with the tapered surface 47. An annular groove 50 having a rectangular cross section is formed on the outer periphery on one end side of the retainer 44.
[0015]
As shown in FIGS. 1 and 5, the annular groove 50 is fitted with a ring spring 51 formed in an annular shape by a wire. This ring spring 51 is for urging the protrusion 45 of the retainer 44 in the reduced diameter state shown in FIGS. 1 to 4, and has a length of one or more rounds along the annular groove 50 of the retainer 44. A circumferential overlap portion 58 is provided. 59 and 59 are circumferential ends of the wire of the spring 51.
[0016]
In such a thing, when comprising a coupling, the sealing material 21 is first inserted in the accommodating part 17 of the cylindrical main body 11 first. Then, with the retainer 44 in a state where the ring spring 51 is fitted in the annular groove 50 being accommodated on the inner peripheral side of the tapered surface 37 of the pusher wheel 25, the pusher wheel 25 is screwed into the cylindrical main body 11. Then, the state shown in FIG. 6 is obtained, and the retainer 44 is accommodated in the space 39.
[0017]
When joining the joint and the flexible tube 1 in this state, from the state shown in FIG. 6, as shown in FIG. 1, the pipe is cut at the valley portion 5 of the corrugate tube 2 and several peaks at the tip of the corgate tube 2. The flexible tube 1 with the covering 3 removed is inserted into the hole 33 from the end of the pusher wheel 25. Then, as shown in FIG. 7, the crest 4 at the tip of the corrugate tube 2 hits the protrusion 45 of the retainer 44, and the retainer 44 is moved in a direction approaching the sealing material 21. Then, the outer peripheral tapered surface 47 of the retainer 44 is separated from the tapered surface 37 of the pusher wheel 25.
[0018]
When the flexible tube 1 is further inserted in this state, the retainer 44 comes into contact with the end face of the sealing material 21, and this time, the peak portion 4 of the corgate pipe 2 acts on the tapered surface 46 of the protrusion 45 of the retainer 44 as shown in FIG. The retainer 44 is pushed and expanded against the elasticity of the spring 51 and passes through the inner periphery of the protrusion 45. At this time, the retainer 44 is formed with a plurality of incisions 48 in the circumferential direction, and the retainer 44 is formed with a thin portion 49. Therefore, the retainer 44 can be easily expanded.
[0019]
Thus, when the retainer 44, that is, the protrusion 45 is expanded in diameter, the diameter of the spring 51 is expanded accordingly. At this time, the spring 51 has an overlap portion 58, and even when the spring 51 is expanded in diameter, the overlap portion 58 has a pair of adjacent end portions 59, 59 in the wire direction adjacent to each other. The length of the projection 45 formed by the cuts 48, 48 is not longer than the circumferential width. For this reason, as in the case of not having such a length, there is an accident in which one protrusion 45 is fitted between the circumferential ends 59 of the spring 51 when the protrusion 45 is expanded. Occurrence is reliably prevented. If the protrusion 45 is caught between the circumferential ends 59 of the spring 51 as described above, the spring 51 cannot be reduced in diameter after the peak portion 4 of the corgate pipe 2 passes through the protrusion 45. Therefore, although the diameter of the protrusion 45 cannot be reduced, as described above, the circumferential ends 59 and 59 of the wire are arranged in the circumferential direction of one protrusion 45 formed by a pair of adjacent cuts 48 and 48. By setting the length of the spring 51 so as not to open more than the width, it is possible to prevent a situation in which the diameter of the protrusion 45 cannot be reduced due to the above-described fitting. For this reason, the protrusion 45 can be reliably reduced in diameter by the spring 51 and can be engaged with the valley 5 on the outer periphery of the corrugate tube 2.
[0020]
In this way, the flexible tube 1 and the joint can be securely joined to each other in a sealed state by simply inserting the flexible tube 1 into the joint and without any other operation such as screwing of the members. Can do. When the pulling-out force from the joint is applied to the flexible tube 1, the outer peripheral tapered surface 47 of the retainer 44, which is engaged with one trough portion 5 of the corrugate tube 2, hits the tapered surface 37 of the push ring 25, The retainer 44 receives a reaction force radially inward from the pusher wheel 25. Then, the protrusion 45 of the retainer 44 presses the outer periphery of one valley portion 5 of the corrugate pipe 2 over the entire circumference, and the engagement between the retainer 44 and the corgate pipe 2 is ensured. This prevents the flexible tube 1 from coming out of the joint.
[0021]
【The invention's effect】
As described above, according to the present invention, the flexible tube and the joint can be securely connected to each other in a sealed state by inserting the flexible tube into the joint without any other operations such as screwing the member. When the pull-out force from the joint acts on the flexible tube, the outer peripheral surface of the retainer is pressed against the tapered surface of the inner periphery of the pusher wheel, and the reaction force causes the diameter of the protrusion to be increased. An inward force in the direction acts, and this force causes a diameter reducing force to act on the retainer, so that the protrusion is strongly engaged with the valley portion of the corrugate tube, so that it can be reliably prevented from coming out, The ring-shaped spring is used when the protrusion of the retainer is pushed and expanded by the crest on the outer periphery of the corrugate tube when the flexible tube is inserted. Since the parts are configured with a length that does not open more than the circumferential width of one protrusion formed by a pair of adjacent notches, the protrusions do not have such a length. The occurrence of an accident in which one protrusion fits between the ends in the circumferential direction of the spring during the expansion is reliably prevented, and therefore the protrusion cannot be reduced in diameter by such a fit. The occurrence of such a situation can be prevented, and the protrusion can be surely reduced in diameter by this spring and can be engaged with the valley portion on the outer periphery of the corgate pipe.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a flexible tube joint according to an embodiment of the present invention.
FIG. 2 is a perspective view of the retainer in FIG.
FIG. 3 is another perspective view of the retainer.
FIG. 4 is a sectional view of the retainer.
5 is a perspective view of the ring spring in FIG. 1. FIG.
6 is a cross-sectional view showing a state before a flexible tube is inserted into the joint of FIG.
7 is an enlarged cross-sectional view of a main part showing the next stage of FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Corrugate pipe | tube 4 Mountain part 5 Valley part 25 Push ring 37 Tapered surface 44 Retainer 45 Protrusion part 47 Peripheral taper surface 48 Notch 51 Ring spring 59 End part

Claims (1)

A joint for a flexible tube composed of a corrugate tube, comprising a cylindrical main body and a push ring whose tip is inserted into the cylindrical main body, the flexible tube being a corrugate tube, From the end of the press wheel, it can be inserted into the inside of the press wheel and the cylindrical main body, and the inner periphery of the press wheel is formed with a tapered surface that expands toward the tip side of the press wheel, An annular retainer is disposed on the inner peripheral side of the tapered surface, and the retainer has a tapered outer peripheral surface that can come into contact with the tapered surface and a projecting portion that protrudes inward in the radial direction. , together with the cuts from one end having a projection in the axial direction which is formed in a direction toward the other end side is provided in a plurality of positions in the circumferential direction, the other end portion wherein the cut is not et provided with a circumferential In the direction and By the outer peripheral portion than in Pas outer circumferential surface of the is configured as thin-walled portion that is scraped off, the mountain by when the flexible tube is inserted, is pushed open projections by crests of the outer periphery of Korugeito tube The protrusion can be deformed so as to engage with the valley on the outer periphery of the corrugate pipe by allowing the passage of the portion and passing the peak, and the protrusion of the retainer is placed on the outer periphery of the retainer. A ring-shaped spring formed of a wire material that can be biased to a reduced diameter state is mounted. This spring has a flexible tube inserted through it, and the protrusion of the retainer is pushed out by the peak of the outer periphery of the corrugate tube. Sometimes, the ends in the circumferential direction of the wire are configured with a length that does not open beyond the circumferential width of one protrusion formed by a pair of adjacent cuts. Fitting for a flexible tube according to claim.

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