JP2000186791A - Joint for flexible pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a flexible pipe from slipping off by temporarily holding an anti-slipping member to a joint main body, preventing a pressing ring in temporary holding from being excessively screwed and immediately screwing the pressing ring from the temporarily holding state of the anti-slipping member. SOLUTION: A joint for flexible pipe is provided with a joint main body, an anti-slipping member 7, and a pressing ring having a pressing part 54. When the anti-slipping member 7 is pressed by the pressing part 54 of the pressing ring, an engaging part 79 of the anti-slipping member 7 is engaged with the back surface of an angled part of the flexible pipe inserted in the joint main body. A contact part 36 is provided on the joint main body, and a temporarily locking piece 73 facing the contact part 36 is provided on the anti-slipping member 7. The temporarily locking piece 73 is continuous with the anti-slipping piece main body 71 through a brittle part 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a flexible tube used for connecting a flexible tube, and in particular, a retaining member for retaining the flexible tube in a joint body. The present invention relates to a flexible pipe joint.

[0002]

2. Description of the Related Art A conventional flexible pipe joint of this type is disclosed in Japanese Utility Model Registration No. 2534246. As shown in FIGS. 8 and 9, this flexible pipe joint includes a tubular joint main body 11, an annular retaining member 12 that can be reduced in diameter and housed in the joint main body 11, and a detachable retaining member 12. And a pressing wheel 13 provided with a pressing portion 14 for pushing. In this flexible pipe joint, the retaining member 12 is connected to the joint body 11.
When the holding member 1 is temporarily held, as shown in FIG.
In addition to connecting the pressing ring 13 to the joint main body 11 accommodating the joint body 2 via the screw portion 15, the joint main body 11
A temporary fixing member 18 as a spacer formed by a substantially C-shaped elastic member having a cut-out portion is sandwiched between the end surface 16 and the stepped surface 17 provided on the pressing wheel 13. . By doing so, the pressing portion 14 of the pressing wheel 13 is inserted into the joint body 11 and faces the retaining member 12, so that
While the retaining member 12 is prevented from dropping from the joint body 11 and the retaining member 12 is temporarily held by the joint body 11, the action of the temporary retaining member 18 prevents the pressing ring 13 from being excessively screwed.

When the flexible tube 100 is connected to the joint for a flexible tube, as shown in FIG. 8, the retaining member 12 is temporarily held by the joint body 11 as shown in FIG. By inserting the flexible tube 100 through the pressing ring 13 and the annular retaining member 12, the distal end of the flexible tube 100 abuts against the packing 19 held by the joint body 11, and the temporary fixing member 18. Is removed from between the end face 16 of the joint body 11 and the stepped face 17 of the pressing wheel 13. When the retaining member 12 is pushed in by the pressing portion 14 by screwing the pushing wheel 13 into the joint body 11 and moving forward, the retaining member 12 is tapered to the tapered surface 21 on the joint body 11 side.
And the engagement portion 22 of the retaining member 12 is moved to the ridge portion 101 of the distal end portion of the flexible tube 100.
After being projected from the radially outer side to the rear side of the crest 101, the crest 101 is crushed and held in cooperation with the packing 19, whereby the flexible tube 100 is pulled out by the retaining member 12. Be stopped.

[0004]

According to the conventional joint for a flexible tube described above, the push ring 13 is screwed from the temporary holding state of the retaining member 12 described with reference to FIG. When performing the work, the temporary fixing member 18 must be removed from between the end surface 16 of the joint body 11 and the stepped surface 17 of the press wheel 13 before screwing the press wheel 13. Then, to remove the temporary fixing member 18,
After loosening the pressing wheel 13 a little, it is necessary to insert a tool into the missing circular portion of the temporary fixing member 18 and remove the temporary fixing member 18 while expanding its diameter.

However, the temporary fixing member 13
Since the operation of removing the tubing is troublesome and troublesome, the conventional flexible pipe joint has a problem that the operability is poor.

The present invention has been made in view of this problem, and allows a retaining member to be temporarily held on a joint body without using a temporary fixing member 18 shown in FIG. To prevent excessive screwing of the push ring,
When performing the final tightening work to screw in the push ring from the temporarily tightened state where the retaining member is temporarily held to prevent the flexible tube from coming off, screw the push ring with a little greater force at the beginning of the work, and then It is an object of the present invention to provide a joint for a flexible pipe which only requires screwing a push ring into the joint.

[0007]

According to the present invention, there is provided a joint for a flexible tube, comprising: a tubular joint body into which a flexible tube having a crest bulging radially outward at a distal end portion is inserted; A retaining member that is provided in the joint body with an engaging portion for;
A press ring which is screwed and coupled to the joint body and has a pressing portion for pushing the retaining member, wherein the engaging portion is inserted into the joint body by pushing the retaining member. In the flexible pipe joint adapted to engage with the back surface of the ridge of the flexible tube, the joint body has a contact portion located radially outside the flexible tube inserted into the joint body. The retaining member is provided with an annular retaining member main body which can be inserted through the flexible tube, has the engaging portion, and is pressed by the pressing portion, and is divided into the retaining member main body. A temporary fixing piece is provided so as to protrude outward in the radial direction of the retaining member main body through a possible fragile portion, and has a temporary fixing piece axially opposed to the contact portion. Here, the fragile portion can be formed by a narrow continuous portion provided at a boundary between the outer peripheral portion of the retaining member main body and the temporary fixing piece.

In the present invention, when the push ring is screwed into the joint body accommodating the retaining member, the pressing portion of the push ring pushes the retaining member body, so that the temporary retaining piece engages with the contact portion of the joint body. When the temporary fixing piece engages with the contact portion in this way, the retaining member is temporarily held by the joint main body in a state sandwiched by the contact portion and the pressing portion. Further, the pressing ring can be screwed in with a small force until the temporary fixing piece engages with the hitting portion, but when the temporary fixing piece engages with the hitting portion, it cannot be further screwed in with a small force. Therefore, excessive screwing of the pressing wheel is prevented.

When the retaining tube is temporarily held, the flexible tube is inserted through the push ring or the retaining member body and inserted into the joint body. Thereafter, when a large screwing force is applied to the pressing ring, a size corresponding to the screwing force is obtained. On the other hand, the retaining member body is pushed by the pressing portion by the force, but the temporary retaining piece remains engaged with the contact portion, so the retaining member main body and the temporary retaining piece are continuously connected. The part is divided. When the pressing ring is screwed in after the fragile portion is divided in this way, the pressing portion of the pressing ring pushes the retaining member main body, so that the engaging portion of the retaining member engages with the back surface of the peak portion of the flexible tube to engage the retaining member. Secure the flexible tube.

[0010] In the present invention, the joint body has a receiving surface axially opposed to the distal end of the flexible tube, a tapered surface which is located outside the receiving surface in the axial direction, and which is inclined outwardly. The contact portion is provided on the opposite side of the receiving surface in the axial direction with the tapered surface interposed therebetween, and the retaining member has a sliding portion for the tapered surface on the retaining member main body, and a sliding portion thereof. The movable portion is elastically deformable between an initial state in which the moving portion faces the tapered surface in the axial direction and the temporary fixing piece faces the contact portion in the axial direction, and a reduced diameter state smaller than the initial state. When the retaining member main body from which the stopper pieces are separated and removed is pushed in by the pressing portion and the sliding portion slides on the tapered surface and is reduced in diameter, the engaging portion is connected to the joint. After being inserted into the main body and inserted through the retaining member main body After being protruded from the radial outer side of the ridge of the flexible tube to the back side of the ridge, the ridge is crushed and co-operated with the receiving surface to clamp the ridge. It is possible to

Further, in the present invention, the retaining member main body is provided with a rubber ring, a plurality of arc-shaped members fitted in a ring shape inside the rubber ring, and a space between the arc-shaped members. A spacer having an elasticity interposed therebetween and cooperating with the rubber ring to keep the arc-shaped members in an annular shape; and having the temporary fixing piece on an outer peripheral portion of at least one arc-shaped member. It is possible to let it.

According to such a retaining member main body, when the retaining member main body is pushed in and the sliding portion slides on the tapered surface, the elastic spacer is compressed to reduce the diameter. In addition, in such a retaining member body,
It is desirable that the spacer is made of rubber and that the spacer and the rubber ring are formed as an integral molded body, not only in order to reduce the manufacturing cost, but also in that the assembly is easy.

Further, in the retaining member main body, grooves are formed in the outer peripheral portion of each of the plurality of arc-shaped members, the rubber rings are held in these grooves, and the engaging portions are formed in the receiving portions. When the ridge portion of the flexible tube is crushed and clamped by cooperation with a surface, the exposed portion of the rubber ring from the groove portion is in close contact with the tapered surface to seal the contact portion. It is desirable that With this configuration, the tight contact between the exposed portion of the rubber ring from the groove and the tapered surface is sealed.

Further, when the engaging portion cooperates with the receiving surface to crush and clamp the ridge portion of the flexible tube, the retaining member main body can crush the flexible tube. It is desirable that a sealing material sandwiched between the portion and the seat surface provided on the joint body is held by the joint body.
With such a configuration, in addition to sealing the contact portion between the exposed portion of the rubber ring from the groove portion and the tapered surface, the crushed portion of the flexible tube and the seating surface provided on the joint main body are formed. Since the gap is sealed by the sealing material, the sealing is performed twice and the sealing reliability is improved.

In the joint for a flexible tube according to the present invention, the cylindrical portion into which the distal end portion of the flexible tube inserted into the joint body and inserted through the retaining member body is externally fitted is formed. It is preferable that the outer peripheral surface of the tubular portion is formed as an inwardly extending guide surface that guides the distal end portion of the flexible tube to the receiving surface. With this configuration, when the crest of the flexible tube is crushed and clamped by the cooperation of the engaging portion of the retaining member and the receiving surface of the joint body, the distal end of the flexible tube is guided. There is an advantage that the surface is surely guided to the receiving surface, and an advantage that the distal end portion of the flexible tube is less likely to be excessively deformed due to the crush of the mountain portion.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a half sectional view showing a temporarily tightened state in which a retaining member 7 is temporarily held in a flexible tube joint of the present invention, and FIG. 2 is a flexible tube joint of the flexible tube joint of the present invention. 1
00 is a half cut sectional view showing a final tightening state in which 00 is stopped,
The flexible pipe joint shown in these figures has a cylindrical joint body 3.
, A pressing wheel 5 and a retaining member 7.

The joint body 3 has an engaging portion 31 for the operating tool, and a connection port portion 32 and a cylindrical portion 33 projecting in opposite directions on both sides of the engaging portion 31. A flexible tube 10 inserted into the joint body 3 is provided in the joint body 3.
Annular receiving surface 34 axially opposed to the leading end 110
A cylindrical tapered surface 35 that is inclined outwardly and is located outside the receiving surface 34 in the axial direction, and an annular contact portion that is located on the opposite side of the receiving surface 34 in the axial direction with the tapered surface 35 interposed therebetween. 36 are provided, and the contact portion 36 is located radially outside the flexible tube 100 inserted into the joint body 3. An annular sealing material holding groove 38 that holds a sealing material 37 made of an O-ring is provided radially outside the receiving surface 34.
The entirety of the groove wall surface is formed as a seat surface 39. Further, a cylindrical portion 41 is provided on the inner peripheral edge of the receiving surface 34 so as to protrude outward in the axial direction, and the outer peripheral surface of the cylindrical portion 41 is formed as an inwardly extending guide surface 42. Further, a female screw 43 is provided on the inner surface side of the cylindrical portion 33.

The pressing wheel 5 has an engaging portion 51 for an operating tool.
And a cylindrical portion 53 extending from the engaging portion 51 and having an external thread 52 on the outer periphery, and a cylindrical pressing portion 54 protruding from the cylindrical portion 53. The pressing wheel 5 is provided with the male screw 52
Is screwed into the female screw 43 on the joint body 3 side to be screwed and connected to the joint body 3, and the pressing portion 54 is inserted into the joint body 3.

FIGS. 5 to 7 show the retaining member 7 in detail. FIG. 5 is an exploded perspective view of the retaining member 7, FIG. 6 is a front view of the retaining member 7, and FIG. FIG. 7 is a half sectional view taken along line -VII.

As shown in FIGS. 6 and 7, the retaining member 7 is
An annular retaining member main body 71 through which the flexible tube 100 (see FIG. 1 or FIG. 2) can be inserted and pressed by the pressing portion 54 (see FIG. 1 or FIG. 2) of the pressing wheel 5. A temporary fixing piece 73 is provided so as to protrude radially outward of the retaining member main body 71 via a separable weak portion 72.

More specifically, as shown in FIG. 5, the retaining member main body 71 includes a rubber ring 74 and a plurality (four in the illustrated example) fitted in an annular shape inside the rubber ring 74. ) And a plurality of elastic members interposed between the arc members 75... And cooperating with the rubber ring 74 to maintain the arc members 75. (Four in the example shown), and the inner peripheral portion of each of the arc-shaped members 75... Corresponds to the crest 101 (see FIGS. 1 and 2) of the distal end of the flexible tube 100. The temporary fixing pieces 73 are provided on the outer peripheral portion of each of the arc-shaped members 75. In the illustrated example, the outer peripheral portion of the arc-shaped member 75 and the
The fragile portion 72 is formed by a narrow continuous portion provided at the boundary between the two. Further, grooves 77 are formed in the outer peripheral portion of each of the plurality of arc-shaped members 75, and the rubber ring 74 is fitted and held in the grooves 77. The spacer 76 is made of rubber,
The spacer 76 and the rubber ring 74 are integrally formed. In the retaining member 7, the outer peripheral portion of the retaining member main body 71, specifically, the outer peripheral portion of the arc-shaped member 75 is formed as a sliding portion 78 for the tapered surface 35 on the joint main body 3 side. . When the arc-shaped member 75 is pressed inward in the radial direction, the spacer 76 having elasticity is compressed to reduce the diameter of the retaining member body 71. In addition, the temporary fixing piece 7
The arc-shaped member 75 having 3 is integrally formed of, for example, a synthetic resin.

Here, in the retaining member 7 accommodated in the joint main body 3, the sliding portion 78 of the retaining member main body 71 faces the tapered surface 35 on the joint main body 3 side in the axial direction, and is temporarily fixed. The piece 73 is kept in an initial state in which the piece 73 faces the contact portion 36 on the joint body 3 side in the axial direction.

In the above, when the male screw 52 of the pressing ring 5 is screwed into the female screw 43 of the joint body 3 containing the retaining member 7, the pressing portion 54 of the pressing ring 5 pushes the retaining member main body 71 as shown in FIG. Therefore, the temporary fixing piece 73 connected to the retaining member main body 71 is engaged with the contact portion 36.
When the temporary fixing piece 73 engages with the contact portion 36 in this manner, the retaining member 7 is temporarily held by the joint main body 3 in a state sandwiched between the contact portion 36 and the pressing portion 54 as shown in FIG. In this case, the pressing wheel 5 can be screwed in with a small force until the temporary fixing piece 73 engages with the contact portion 36, but when the temporary fixing piece 73 engages with the contact portion 36, the screw is further screwed in with a small force. Can not be done. This prevents the pressing wheel 5 from being screwed too much.

From the temporarily tightened state in which the retaining member 7 is temporarily held, it is possible to insert the distal end of the flexible tube 100 through the pressing ring 5 and the retaining member body 7 and insert it into the joint body 3 as shown in FIG. The distal end of the flexible tube 100 is externally fitted to the tubular portion 41. Thereafter, when a large screwing force is applied to the pressing wheel 5, the retaining member main body 71 is pushed by the pressing portion 54 as shown by the arrow a in FIG. Is still engaged with the contact portion 36, so that the fragile portion 72 is divided as shown in FIG. When the pressing wheel 5 is further screwed after the fragile portion 72 is divided in this manner, the pressing portion 54 of the pressing wheel 5 is moved to the retaining member main body 7.
4, the sliding portion 78 slides on the tapered surface 35 to reduce the diameter of the retaining member main body 71 as shown in FIG. When the retaining member main body 71 is reduced in diameter in this manner, as shown in FIG. 2, after the engaging portion 79 is protruded from the radially outer side of the ridge 101 of the flexible tube 100 to the back side of the ridge 101. Then, the peak portion 101 is crushed and pinched by cooperation with the receiving surface 34, and the engaging portion 79 is engaged with the back surface of the peak portion 101 to prevent the flexible tube 100 from being pulled out. At this time, the distal end of the flexible tube 100 is surely guided to the receiving surface by the guide surface 42 of the tubular portion 41, and the distal end of the flexible tube 100 is excessively deformed by the crushing of the mountain portion 101. There is an advantage that it becomes difficult. Further, the exposed portion of the rubber ring 74 from the groove portion 77 is in close contact with the tapered surface 35 to seal the contact portion. Further, the sealing material 37 is sandwiched between the crushed portion of the flexible tube 100 and the seat surface 39, and the portion is sealed.

Although FIGS. 1 and 2 show a flexible tube 100 having a large number of peaks 101... Over its entire length, the flexible tube to which the joint of the present invention is used has a radially outer side. It may be one having a bulge at the tip only. The number of the ridges 101 of the flexible tube 100 crushed and clamped by the receiving surface 42 on the joint body 3 side and the engaging portion 79 of the retaining member 7 is one even if it is one. Even so,
There may be more than that.

[0026]

As described above, according to the joint for a flexible tube of the present invention, the retaining member can be temporarily held on the joint body without using the temporary fixing member described with reference to FIG. It is possible to prevent the press ring from being screwed too much during holding. In addition, when performing the final tightening work for screwing the push ring from the temporary holding state of the retaining member to prevent the flexible tube from coming off, screw the push ring with a little large force at the beginning of the work, and thereafter, as in the conventional case, , The workability is improved compared to the prior art.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a temporary holding state of a retaining member in a flexible pipe joint of the present invention.

FIG. 2 is a half cut sectional view showing a fully tightened state in which the flexible tube is prevented from being pulled out in the flexible tube joint of the present invention.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged view corresponding to FIG. 3 for explaining a state in which a temporary fixing piece of a retaining member is divided and removed.

FIG. 5 is an exploded perspective view of the retaining member.

FIG. 6 is a front view of the retaining member.

7 is a half sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a cross-sectional view showing a temporary holding state of a retaining member in a conventional example.

FIG. 9 is a half sectional view showing a state in which a flexible tube in a conventional example is prevented from being pulled out.

[Explanation of symbols]

 3 Joint Main Body 5 Push Ring 7 Detachment Member 34 Receiving Surface 35 Tapered Surface 36 Contact 37 Sealing Material 39 Seat 41 Cylindrical Part 42 Guide Surface 54 Pressing Part 71 Retaining Member Main Body 72 Fragmented Part 73 Temporary Fixing Piece 74 Rubber Ring 75 Arc-shaped member 76 Spacer 77 Groove 78 Sliding part 79 Engagement part 100 Flexible tube 101 Mountain part

Claims (8)

[Claims] 1. A tubular joint body into which a flexible tube having a ridge bulging radially outward at a distal end portion is inserted, and an engagement portion for the ridge portion is provided and housed in the joint body. A retaining ring, and a pressing ring screwed to the joint body and provided with a pressing portion for pushing the retaining member, and the engaging portion is pushed by the retaining member so that the engaging portion is connected to the joint body. A flexible tube joint adapted to engage with the back surface of the crest of the flexible tube inserted into the joint body, wherein the joint body has a radially outer side with respect to the flexible tube inserted into the joint body. A contact portion is provided, wherein the retaining member has an annular retaining member main body that can be inserted through the flexible tube, has the engaging portion, and is pressed by the pressing portion; Through a fragile part that can be divided into the stopper member body Its retaining member provided continuously so as to project radially outward of the main body and the flexible pipe joint and having a temporary joint members that are opposed in the axial direction on the contact portion Te. 2. The flexible member according to claim 1, wherein the weak portion is formed by a narrow continuous portion provided at a boundary between the outer peripheral portion of the retaining member main body and the temporary fixing piece. Pipe fittings. 3. The joint body has a receiving surface axially opposed to the distal end of the flexible tube, a tapered surface which is located outside the receiving surface in the axial direction, and which is inclined outwardly. The contact portion is provided on the opposite side of the receiving surface in the axial direction with respect to the receiving surface. The retaining member has a sliding portion for the tapered surface in the retaining member main body, and the sliding portion is The temporary fixing piece is elastically deformable between an initial state in which the temporary fixing piece faces in the axial direction and the temporary fixing piece confronts the contact portion in the axial direction, and a reduced diameter state smaller than the initial state. The engaging portion is inserted into the joint body when the detached retaining member main body is pushed in by the pressing portion and its sliding portion is reduced in diameter by sliding on the tapered surface. Of the flexible tube inserted into the retaining member body 3. The protruding portion is protruded from the radially outer side to the rear side of the crest portion, and then the crest portion is crushed and co-operated with the receiving surface to clamp the crest portion. 4. Flexible tube joint. 4. A rubber ring, a plurality of arc-shaped members which are annularly arranged and fitted inside the rubber ring, and the rubber member is interposed between the arc-shaped members and the rubber member. And a spacer having elasticity for cooperating with the ring to keep the arc-shaped members in an annular shape, wherein the temporary fixing piece is provided on an outer peripheral portion of at least one arc-shaped member. The joint for a flexible pipe according to claim 3. 5. The flexible pipe joint according to claim 4, wherein the spacer is made of rubber, and the spacer and the rubber ring are formed as an integral body. 6. A plurality of arcuate members each having a groove formed on an outer peripheral portion thereof, and the rubber ring is held in the groove, and the engaging portion cooperates with the receiving surface to cooperate with the receiving surface. When the ridge of the flexible tube is crushed and clamped, the exposed portion of the rubber ring from the groove is in close contact with the tapered surface to seal the contact portion. 4. The joint for a flexible tube according to 4. 7. When the engaging portion cooperates with the receiving surface to crush and hold the ridge of the flexible tube, the ridge is provided between the crushed portion of the flexible tube and the joint body. 7. The flexible pipe joint according to claim 2, wherein the seal material clamped by the seated surface is held by the joint body. 8. A cylindrical portion, on the inner peripheral edge of the receiving surface, into which the distal end of the flexible tube inserted into the joint body and inserted through the retaining member main body is externally fitted. The outer peripheral surface of the cylindrical portion is formed as an inwardly extending guide surface for guiding the distal end portion of the flexible tube with respect to the receiving surface. The joint for a flexible pipe according to any one of claims 6 and 7.