JP4820238B2 - Flexible hose connection mechanism - Google Patents

Description

  The present invention relates to a flexible hose connection mechanism.

  Conventionally, as drainage connection pipes for guiding drainage from, for example, a bathroom or a toilet of a house to a drain, there are those shown in Patent Documents 1 and 2 below.

Japanese Patent Laid-Open No. 11-37378 Utility Model Registration No. 3064344

  Patent Documents 1 and 2 include a hose body, a pipe joint for connecting an upstream end and a downstream end of the hose body to, for example, a connection port of a drain pipe and a connection port of a sewage tank, and a pipe joint and a hose body, respectively. And a sealing member for sealing between the hose body and the pipe joint, and the hose body has a smooth inner peripheral surface and includes an inner cylinder portion made of soft vinyl chloride containing a plasticizer. The outer cylindrical portion is made of hard vinyl chloride and is attached to the outer peripheral surface of the inner cylindrical portion, and gives the inner cylindrical portion rigidity in the radial direction while maintaining the flexibility of the inner cylindrical portion. This ensures strength and flexibility, prevents breakage due to crushing and earthquakes, etc., and also allows smooth drainage by suppressing the attachment of dirt, and also provides good sealing between the hose body and the pipe joint It has the advantage of being able to

  However, when a large load is applied to the connection portion between the hose body and the pipe joint due to the bending of the hose body, the connection portion is likely to come off and water leakage may occur from the connection portion.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to strengthen the connection between the hose body and the pipe joint, and from the connection part even if a large load is applied to the connection part between the hose body and the pipe joint. It is providing the flexible hose connection mechanism which can prevent water leakage.

In order to achieve the above object, a flexible hose connection mechanism of the present invention includes a flexible hose made of synthetic resin, a pipe joint made of synthetic resin connected to an end of the flexible hose, and a flexible hose. In a state where it is sheathed at the end of the flexible hose, it is provided with a synthetic resin halved connection ring that connects the flexible hose and the pipe joint,
The flexible hose has an outer periphery formed in a bellows shape,
The pipe joint has a fitting cylinder part into which one end of the flexible hose is fitted on one end side, a connecting cylinder part connected to a connection port on the other end side, and the fitting cylinder While the portion has an insertion recess that allows the end of the flexible hose that covers the connecting ring to be inserted on the inner peripheral side, and an annular engagement protrusion formed on the outer peripheral surface of the end,
The connection ring is provided on a cylindrical ring main body that is externally fitted to the fitting tube portion when the flexible hose and the pipe joint are connected, and is protruded from the inner peripheral surface of the end of the ring main body on the pipe joint side, An annular rib that fits into the trough of the flexible hose and an outer peripheral surface of the ring body on the side opposite to the pipe joint side project to the flexible hose end of the fitting tube Position restriction flange for restricting the insertion position of the fitting cylinder part at the time of insertion, a plurality of notches provided in the flange, and the fitting cylinder part provided in the notch and inserted into the end of the flexible hose Is a U-shaped longitudinal section having an engaging claw that contacts the engaging protrusion in this state on the inner surface side while pressing the ring main body from the outer peripheral side of the ring main body toward the inner peripheral side. A flexible hose connection mechanism comprising a locking portion of
The engaging portion of the connecting ring has a convex portion on the outer surface side, and is inserted into a flexible hose to prevent the engaging claw from coming off from the engaging protrusion. A cylindrical cover body made of a synthetic resin that presses the connecting ring from the outer peripheral side is provided so as to cover the connecting ring, and this cover body is engaged with the convex portion to cover the cover body. An L-shaped engaging groove to be fixed is provided on the inner peripheral side.

In the present invention, a flexible hose made of a synthetic resin, a pipe joint made of a synthetic resin connected to the end of the flexible hose, and a sheath attached to the end of the flexible hose And a synthetic resin halved connecting ring that connects the pipe joint, and the insertion tube portion is inserted into the ring body of the connection ring when the insertion tube portion is inserted into the end of the flexible hose. A position restricting flange for restricting the position is provided, a plurality of notches are provided in the position restricting flange, and an engaging claw that engages with an engaging protrusion formed on the fitting tube portion of the pipe joint is provided in the notch on the inner surface. A locking portion having a U-shaped longitudinal cross section is provided on the side, and a convex portion is provided on the outer surface side of the locking portion, while being inserted through a flexible hose and connected from the locking portion side of the connecting ring. A cylindrical cover body made of synthetic resin that presses the outer ring from the outer circumference side, covering the connecting ring Furthermore, an L-shaped engagement groove that engages with the convex portion and fixes the cover body is provided on the inner peripheral side of the cover body so that the engagement protrusion engages with the engagement protrusion from above. In this state, since the connecting ring including the locking portion is pressed from the outer peripheral side, it is possible to reliably prevent the situation where the engaging claw is easily detached from the engaging protrusion. Even when a large load is applied to the connection portion with the pipe joint due to the bending load, it is possible to avoid the situation where the connection portion is difficult to come off and water leakage is caused from the connection portion.
That is, according to the present invention, when the cover body is not provided, a part or all of the engaging claws engaged with the engaging protrusion are removed from the engaging protrusion, so that the flexible member is connected via the connecting ring. The connection state of the hose and the pipe joint is deteriorated, and in the worst case, a situation where the flexible hose is detached from the pipe joint can be avoided.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited thereby.

1 to 7 show an embodiment of the present invention. FIG. 1 shows a flexible hose, and FIGS. 2 to 7 show a connection procedure.
1 to 7, the flexible hose connection mechanism 1 includes a synthetic resin flexible hose 2, a synthetic resin pipe joint 3 connected to the end E of the flexible hose 1, and In a state where the flexible hose 1 is externally mounted on the flexible hose end portion M, a synthetic resin half-divided connecting ring 4 that connects the flexible hose 1 and the pipe joint 3 is mainly provided.
The flexible hose 1 is made of a hard synthetic resin having alternating ridges 5 and valleys 6 and is fused to the bellows-like outer tube 7 and the valleys 6 of the outer tube 7 at the time of extrusion. It is comprised with the linear inner tube 8 formed so that it might have an internal peripheral surface. The inner tube 8 is formed of a thermoplastic elastomer (TPE) that can be fused with a hard synthetic resin and can be elastically stretched. That is, as in the prior art, by forming the inner tube with soft vinyl chloride that normally contains 30 to 40% plasticizer, the drainage connecting tube composed of the inner tube and the outer tube is made flexible. Instead, in the present invention, the flexible hose 2 is made flexible by molding the inner tube 8 using a material that has the property of elastic expansion and contraction without containing a plasticizer. It is a thing. The TPE refers to a material that flows when heated and can be molded in the same manner as ordinary thermoplastics and exhibits rubber-like elasticity at room temperature. Rubber-like elasticity refers to a polymer substance that usually stretches more than twice when stretched at room temperature and instantaneously returns to its original shape when an external force is removed. In other words, the elastomer that is the material of the inner tube 8 can be elastically expanded and contracted unlike a normal soft synthetic resin. Therefore, even if the valley portions 6 of the bellows-shaped outer tube 7 are joined, the bellows of the outer tube 7 is used. The effect of reducing tube flexibility due to the shape is small, and the inner tube 8 can be made thick. Further, the thickness of the outer tube 7 is extended or compressed at the time of molding, so that it differs depending on the peak portion 5, the valley portion 6, and the connecting portion 9, but the extruded thickness is slightly thinner than the inner tube 8. Is preferably set.
The pipe joint 3 has a fitting tube portion 10 into which a flexible hose end portion E is fitted at one end side, and a connecting tube connected to the other end side, for example, a connection port 11 of a drain pipe or a drainage tub. Further, the fitting tube portion 10 includes an insertion recess 15 into which the flexible hose end E with the connecting ring 4 sheathed can be inserted on the inner peripheral side, and an end outer peripheral surface m. And an annular engagement protrusion 16 formed.
When the flexible hose 2 and the pipe joint 3 are connected, the connection ring 4 includes a cylindrical ring body 17 that is externally fitted to the fitting cylinder 10 and an inner periphery of the end of the ring body 17 on the pipe joint side. An annular rib 40 that protrudes from the surface and fits into the trough 6c of the flexible hose 2, and an outer peripheral surface that protrudes from the outer peripheral surface of the ring body opposite to the pipe joint side. Position restriction flange 18 for restricting the insertion position of fitting tube portion 10 when inserted into flexible hose end E, a plurality of cutouts 19 provided in flange 18, and provided in cutout 19. The fitting cylinder portion 10 inserted into the flexible hose end E contacts the position regulating flange 18 while pressing the ring main body 17 from the outer peripheral side of the ring main body 17 toward the inner peripheral side. Longitudinal cross section with an engaging claw 20 engaging the engaging protrusion 16 on the inner surface side. The more the engaging portion 21 of the mold shape. R is a gap portion formed in the half connection ring 4.
Furthermore, the insertion recess 15 of the pipe joint 3 is provided in order from the insertion port a in the insertion direction of the flexible hose end E (direction indicated by the arrow P), the inner diameter large diameter portion 23, the inner diameter small diameter portion 24, and It consists of an annular connecting part 25. The inner diameter large diameter portion 23 has an inner diameter B that is larger than the outer diameter A of the peak portion 5 of the flexible hose end E, and the connecting ring 4 is sheathed on the flexible hose end E. The ring body 17 is formed so as to be fitted inside. The inner diameter small diameter portion 24 has an inner diameter C substantially equal to the outer diameter A of the peak portion 5 of the flexible hose end E, and the flexible hose end E is formed so as to be fitted inside. The annular connecting portion 25 is a portion with which the first peak portion 5a located at the extreme end on the insertion side of the flexible hose 2 comes into contact, and is smaller than the inner diameter of the inner diameter small diameter portion 24. It has a diameter and is connected to a connection port 11 of the drain pipe.
26 and 27 are O-rings. The O-ring 26 is fitted into a first trough portion 6a adjacent to the first peak portion 5a located at the endmost portion on the insertion side of the flexible hose 2. The O-ring 27 is fitted in the second valley 6b located between the first peak 5a and the second peak 5b. When the insertion of the flexible hose into the insertion recess is completed, the first trough 6a in which the O-ring 26 is fitted and the second trough 6b in which the O-ring 27 is fitted have an inner diameter. The lengths of the flexible hose end E and the insertion recess 15 are set so as to be located in the small diameter portion 24.

The characteristic configuration of the present invention will be described below.
Reference numeral 30 denotes a protrusion formed so as to protrude from the outer surface of the locking portion 21 of the connecting ring 4. The convex portion 30 is provided along the position restriction flange 18. 31 is a cylindrical cover body made of synthetic resin provided so as to cover the connecting ring. The cover body 31 has a function of preventing the engaging claw 20 from coming off from the engaging protrusion 16, and is inserted into the flexible hose 2 so as to be connected to the connecting ring 4 from the engaging portion side. 4 is pressed from the outer peripheral side. The cover body 31 is provided with an L-shaped engagement groove 32 that engages with the convex portion 21 and fixes the cover body 31 on the inner peripheral side. The cover body 31 is configured such that the circular other opening 31b is set smaller than the circular one opening 31a, and the connecting ring 4 is pressed from the outer peripheral side from the one opening side. A pair of the L-shaped engaging grooves 32 are formed on the inner surface of the peripheral surface portion n of the cover body 31 with an appropriate depth and with a circumferential angle interval of 180 °. The L-shaped engagement groove 32 is formed in the direction from the one opening 31a side to the other opening 31b side by side, in the direction of the wide-mouthed inlet portion 35, the direction perpendicular to the circumferential direction, and has a predetermined width. It consists of a locking portion 37 that is bent from the portion 36 and the straight portion 36 in the circumferential direction. The entrance portion 35 and the straight portion 36 form a Y shape.
In addition, from the time when the convex portion 20 of the connecting ring is moved from the wide-mouth entrance portion 35 to the straight portion 36 until the convex portion 20 reaches the locking portion 37 of the engaging groove 32, the locking portion 21. The inner surface of the peripheral surface portion n of the cover body 4 is set so that the inner diameter decreases from one opening 31a to the other opening 31b so that the pressing force for tightening the connecting ring 4 to the flexible hose 2 gradually increases. Formed on the tapered surface. Reference numeral 50 denotes a plurality of projections provided at appropriate intervals in the circumferential direction of the outer surface of the peripheral surface portion n of the cover body 31 for easily holding the cover body 31 and making the rotation operation easy.

Thus, at the construction site, for example, when connecting to the connection port 11 of the drain pipe, first, the flexible hose 2 is cut to a predetermined length. At this time, as shown in FIG. 2, the flexible hose 2 is cut at right angles to the tube axis X. 100 shows a cutting position. After the cutting, an annular rib 40 is fitted into the third valley portion 6 c shown in FIG. 2, so that the split connection ring 4 is fitted onto the flexible hose 2. Subsequently, the O-ring 26 is fitted into the first valley 6a, the O-ring 27 is fitted into the second valley 6b, and a lubricant is applied to the O-rings 26, 27 and the fitting portion. A region F in FIG. 2 is a region where a lubricant is applied.
Next, as shown in FIG. 3, the pipe joint 3 is fitted into the flexible hose end E until the engagement protrusions 16 of the pipe joint 3 are engaged with the engagement claws 20 of the connection ring 4. FIG. 4 shows a state in which the engagement protrusion 16 is engaged with the engagement claw 20.
Subsequently, after confirming whether or not the engaging claw 20 is engaged with the engaging protrusion 16, the operator connects the cover body 31 previously passed through the flexible hose 2 as shown in FIG. It inserts into the pipe joint side so that the ring 4 may be covered. At this time, since the inner surface of the peripheral surface portion n of the cover body 4 is formed in a tapered surface whose inner diameter is set smaller from the one opening 31a to the other opening 31b, as shown in FIG. In a state where the convex portion 30 of the connecting ring 4 is positioned at the inlet portion 35 of the engaging groove 32, the connecting ring 4 including the locking portion 21 is fastened to the flexible hose 2, and the pressing force by the cover body 4 starts to be applied. . Subsequently, as the cover body 31 is inserted, the pressing force tightened to the flexible hose 2 gradually increases, and the convex portion 30 is positioned in the straight portion 36 of the L-shaped engagement groove 32. Become. FIG. 6 shows a state in which the convex portion 30 is located at the boundary between the straight portion 36 and the locking portion 37 in the straight portion 36. When the cover body 31 is rotated in the direction indicated by the arrow H while touching the protrusion 50 in this state, the convex portion 30 is positioned at the locking portion 37 of the L-shaped engaging groove 32 as shown in FIG. In this state, the cover body 31 is fixed, and the engagement claw 20 can be hardly detached from the engagement protrusion 16. Then, the connection cylinder part 14 of the pipe joint 3 is connected to the connection port 11 of the drain pipe.

FIG. 8 shows an example suitable for use of the flexible hose connection mechanism 1 according to the present invention.
That is, the flexible hose connection mechanism 1 can be suitably used for the centralized unit drainage system S that can collect domestic wastewater in a house and discharge it outdoors.
Normally, domestic wastewater is discharged separately from each place such as a sink, a unit bath, a sink, and a washing machine. Therefore, each drainage basin was necessary, but in this centralized unit drainage system S, for example, the flexible hose connection mechanism 1 is used in each place such as the sink 60, the unit bath 61, the washstand 62, and the washing machine 63. The drainage can be collected in a single central drainage basin 64 installed under the floor and discharged to an outdoor drainage pit 65, and only one drainage pipe 66 can be embedded in the ground.

It is a figure which shows the flexible hose used in one embodiment of this invention. It is a figure for demonstrating the positional relationship of the connection ring with respect to the flexible hose used in the said embodiment, and O-ring. It is a figure which shows the state just before fitting the pipe joint used in the said embodiment in the flexible hose end part. In the said embodiment, it is a figure which shows the state before covering a connection ring with the cover body penetrated by the flexible hose in the state which the pipe joint engaged with the connection ring on a flexible hose. In the said embodiment, it is a figure which shows the initial engagement state of a cover body and a connection ring. In the said embodiment, it is a figure which shows the state in the middle of engagement of a cover body and a connection ring. In the said embodiment, it is a figure which shows the state which engagement of the cover body and the connection ring was completed. It is a figure which shows the use condition in the said embodiment.

Explanation of symbols

Reference Signs List 2 Flexible hose 3 Pipe joint 4 Connection ring 5 Peak 6 Valley 9 Insert cylinder 11 Connection port 14 Connection cylinder 15 Insertion recess 16 Engagement protrusion 17 Ring body 18 Position restriction flange 20 Engagement claw 21 Locking Part 30 convex part 31 cover body 32 engaging groove 40 rib E flexible hose end part

Claims (3)

The flexible hose and the pipe joint in a state where the flexible hose made of synthetic resin, the synthetic resin pipe joint connected to the end of the flexible hose, and the flexible hose end are sheathed It is equipped with a halved connecting ring made of synthetic resin to be connected,
The flexible hose has an outer periphery formed in a bellows shape,
The pipe joint has a fitting cylinder part into which one end of the flexible hose is fitted on one end side, a connecting cylinder part connected to a connection port on the other end side, and the fitting cylinder While the portion has an insertion recess that allows the end of the flexible hose that covers the connecting ring to be inserted on the inner peripheral side, and an annular engagement protrusion formed on the outer peripheral surface of the end,
The connection ring is provided on a cylindrical ring main body that is externally fitted to the fitting tube portion when the flexible hose and the pipe joint are connected, and is protruded from the inner peripheral surface of the end of the ring main body on the pipe joint side, An annular rib that fits into the trough of the flexible hose and an outer peripheral surface of the ring body on the side opposite to the pipe joint side project to the flexible hose end of the fitting tube Position restriction flange for restricting the insertion position of the fitting cylinder part at the time of insertion, a plurality of notches provided in the flange, and the fitting cylinder part provided in the notch and inserted into the end of the flexible hose Is a U-shaped longitudinal section having an engaging claw that contacts the engaging protrusion in this state on the inner surface side while pressing the ring main body from the outer peripheral side of the ring main body toward the inner peripheral side. A flexible hose connection mechanism comprising a locking portion of
The engaging portion of the connecting ring has a convex portion on the outer surface side, and is inserted into a flexible hose to prevent the engaging claw from coming off from the engaging protrusion. A cylindrical cover body made of a synthetic resin that presses the connecting ring from the outer peripheral side is provided so as to cover the connecting ring, and this cover body is engaged with the convex portion to cover the cover body. A flexible hose connection mechanism, wherein an L-shaped engagement groove to be fixed is provided on an inner peripheral side. The insertion recess of the pipe joint was sequentially provided in the insertion direction of the flexible hose end from the insertion port,
An inner diameter large diameter portion that has an inner diameter that is larger than the outer diameter of the peak portion of the flexible hose end portion, and can be fitted into the ring main body of the connecting ring that is sheathed on the flexible hose end portion;
An inner diameter small-diameter portion having an inner diameter substantially equal to the outer diameter of the peak portion of the flexible hose end, and the flexible hose end can be fitted therein;
The first peak portion located at the extreme end portion on the insertion side of the flexible hose comes into contact, and has an outer diameter smaller than the inner diameter of the small diameter portion, and is composed of an annular connection portion to which a pipe is connected. ,
Moreover, it is a trough part of a flexible hose, Comprising: The 1st trough part adjacent to the said 1st peak part located in the endmost part in the insertion side of a flexible hose, and a 1st peak O-rings are fitted into the second valley located between the first and second peaks,
When the insertion of the flexible hose into the insertion recess is completed, the first valley where the O-ring is fitted and the second valley where the O-ring is fitted are positioned within the small-diameter portion. While the length of the flexible hose end and the insertion recess is set,
The cover body is configured so that the circular other opening is set smaller than the circular one opening, and the connection ring is pressed from the outer peripheral side from one opening side,
A pair of the L-shaped engaging grooves are formed on the inner surface of the peripheral surface portion of the cover body with an appropriate depth and spaced by a circumferential angle of 180 °. The joint groove was bent in the circumferential direction from the opening portion of the wide mouth, the straight portion formed in the direction perpendicular to the circumferential direction, and the straight portion provided in order from one opening side to the other opening side The locking portion is composed of a locking portion, and from when the convex portion of the connecting ring is moved from the entrance portion of the wide mouth to the straight portion until the convex portion reaches the locking portion of the engaging groove. The inner surface of the peripheral surface portion of the cover body is formed as a tapered surface whose inner diameter is set smaller from one opening to the other opening so that the pressing force for tightening the connecting ring to the flexible hose gradually increases. And the flexible hose is elastically stretched. Possible, flexible hose connection mechanism according to claim 1 having an inner circumferential surface smooth made of soft synthetic resin containing no plasticizer. The flexible hose is made of a hard synthetic resin having alternating ridges and valleys, and an accordion-shaped outer tube, and a linear inner tube fused at the time of extrusion to the valley of the outer tube, The flexible hose connection mechanism according to claim 1 or 2, wherein the inner tube is formed of a thermoplastic elastomer that can be fused to the hard synthetic resin at the time of extrusion and can be elastically stretched.

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