JP7400288B2 - How to remove pipe fittings and pipes - Google Patents

Description

The present invention relates to a pipe joint to which a pipe is connected, and a method for removing the pipe.

As pipes used for water supply or hot water supply piping, thin-walled steel pipes with excellent corrosion resistance, such as stainless steel pipes, are often used. A pipe joint is used to connect such pipes, and the ends of the pipes are inserted into the pipe joint to connect them. In recent years, one-touch pipe fittings have been put into practical use, allowing installation to be completed simply by inserting the pipe into the fitting without the need for any tools.

For example, in the one-touch pipe joint described in Patent Document 1, an O-ring is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base, and a coil spring is attached to the edge of the large-diameter portion. It has a structure in which an inner collar made of synthetic resin into which a retaining member having an edge portion on the side surface is fitted is arranged, and these are covered with a tapered outer collar. According to this pipe joint, when the pipe is inserted from the tip of the inner collar, the retaining member is pushed toward the distal end of the inner collar, but the outer surface of the retaining member is pressed by the tapered surface of the outer collar, and the inner surface of the retaining member is pressed against the tapered surface of the outer collar. The connection between the pipe joint and the pipe is maintained by the edge portion biting into the pipe. When a pulling force is applied to the tube in this connected state, the retaining member is pressed against the tapered surface of the outer collar by the biasing force of the coil spring, and the tapered surface causes the edge of the retaining member to press against the tube, causing the tube to Extraction is prevented. This makes it easy to connect tubes with a single touch, while also preventing the tubes from slipping out.

Japanese Patent Application Publication No. 10-122460

By the way, when performing maintenance or replacement of piping, it may be necessary to remove the pipe from the pipe joint. For example, in the pipe joint of Patent Document 1, in the connected state, by pushing the tip of the inner collar against the biasing force of the coil spring, the contact between the retaining member and the outer collar is released, and the pipe can be removed. However, this removal operation requires a tool such as a screwdriver to be applied in the axial direction of the tube to push the inner collar in the insertion direction of the tube. Therefore, if there is a narrow space around the tube during work, it may be difficult to remove the tube.

The present invention has been made in view of the above circumstances, and provides a one-touch type pipe joint that can prevent the pipe from coming off even in a narrow space around the pipe, and also allows the pipe to be easily removed. and a method for removing the tube.

The pipe joint of the present invention includes a substantially cylindrical housing into which a pipe is inserted from at least one end, and a sealing member that tightly contacts the outer circumferential surface of the pipe. A pipe in which a holding member that holds a retaining member that is engaged with an outer circumferential surface of the pipe in the insertion direction, and an elastic member that biases the retaining member and the retaining member in a counter-insertion direction are disposed. The joint is provided with a through hole that radially penetrates the inside and outside of the housing on the radially outer side of the holding member, and when connected to the pipe, the holding member is inserted through the through hole. By being pressed in the insertion direction from the outside in the radial direction, the holding member and the retaining member move against the biasing force of the elastic member, and the engagement between the retaining member and the tube is released. This is a characteristic feature.

In the present invention, when the engagement between the retaining member and the tube is released, it does not mean that the engagement between the retaining member and the tube is completely released, but also when the engagement is loosened to the extent that the tube can be pulled out. It also includes the state of Further, in the present invention, "the holding member is pressed in the insertion direction" includes a case where the holding member is pressed in an oblique direction including the insertion direction component.

Further, in the pipe joint of the present invention, the holding member is a substantially ring-shaped member, and the through holes are provided in a plurality of holes on the outside in the radial direction of the holding member and spaced apart from each other in the circumferential direction of the housing. It is formed.

Further, in the pipe joint of the present invention, the housing includes a housing body in which the sealing member is built-in, and a nut-shaped member attached to one end of the housing body, and the nut-shaped member has the through-hole. is formed, the holding member is provided inside the through hole, and the elastic member is disposed between the holding member and the housing body.

Further, in the pipe joint of the present invention, the nut-shaped member is slidably attached to the housing main body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed, and movement of the holding member is restricted.

Further, in the pipe joint of the present invention, the pipe joint further includes a pressing jig for pressing the holding member, and the pressing jig is a substantially ring-shaped member having a notch in a part of the circumferential direction. A protrusion that can be inserted into the through hole is formed on its inner peripheral surface.

Further, in the pipe joint of the present invention, the projection of the pressing jig has an inclined surface inclined toward one direction in the axial direction, and the inclined surface is pressed against the holding member. Ru.

The pipe removal method of the present invention is a pipe removal method in which the pipe is removed from a pipe joint using a pressing jig, wherein the pipe is inserted from at least one end of the pipe joint, and the pipe is inserted into the pipe from at least one end thereof, and A holder comprising a substantially cylindrical housing containing a sealing member that fits closely, and holding a retaining member that is engaged with the outer circumferential surface of the tube from the one end toward the insertion direction of the tube within the housing. and an elastic member that biases the retaining member and the retaining member in the anti-insertion direction, and a through hole that radially passes through the inside and outside of the housing is formed on the radially outer side of the retaining member. The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a protrusion that can be inserted into the through hole is formed on the inner circumferential surface of the pressing jig. The method includes a mounting step of expanding the diameter of the pressing jig in a state where the pipe joint and the pipe are connected, and mounting the pressing jig so that the protrusion fits into the through hole of the housing. and a pressing step of pressing the protrusion of the attached pressing jig radially inward to move the holding member and the retaining member against the biasing force of the elastic member, and the pressing step The present invention is characterized in that it includes a pulling step of pulling out the tube that has been disengaged from the retaining member.

In the pipe joint of the present invention, the holding member and the retaining member are biased in the anti-insertion direction within the housing, and the biased retaining member is engaged with the outer circumferential surface of the pipe, thereby preventing the pipe from coming out. It can be prevented. In addition, a through hole is formed on the radially outer side of the holding member, and when the housing is connected to the pipe, the holding member is pressed in the insertion direction from the radially outer side through the through hole. As a result, the holding member and the retaining member move against the biasing force of the elastic member, and the engagement between the retaining member and the tube is released, so that the tube can be easily removed even when there is a narrow space around the tube. Can be removed.

The holding member is a substantially ring-shaped member, and a plurality of through holes are formed on the outside in the radial direction of the holding member and at intervals in the circumferential direction of the housing. Since the holding member can be pressed uniformly from the radial direction through the holding member, it is easy to move the holding member smoothly.

The housing is composed of a housing main body with a built-in sealing member and a nut-like member, a through-hole is formed in the nut-like member, a holding member is provided inside the through-hole, and the holding member and the housing are provided with a through-hole. Since the elastic member is disposed between the housing and the main body, each member within the housing can be easily installed and removed.

The nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed and the movement of the holding member is restricted. Even when the holding member is pressed, the engagement between the retaining member and the tube is maintained. Therefore, even if the pressing member is unintentionally pressed due to an erroneous operation or the like, it is possible to prevent the tube from coming off.

The pipe joint further includes a pressing jig for pressing the holding member, and the pressing jig is a generally ring-shaped member having a notch in a part of the circumferential direction, and has a through hole in the inner circumferential surface thereof. A protrusion that can be inserted is formed, and the protrusion has an inclined surface that is inclined in one direction in the axial direction, and the inclined surface is brought into contact with and pressed against the holding member, so that the holding member is By following the inclined surface, the holding member and the retaining member can be easily moved smoothly, and the engagement between the retaining member and the pipe can be easily released.

The pipe removal method of the present invention is a method using a substantially ring-shaped pressing jig having a protrusion formed on the inner circumferential surface and a notch in a part of the circumference. In the state where the press jig is connected, the diameter of the press jig is expanded and the press jig is attached so that the protrusion fits into the through hole of the housing. There is a pressing process in which the holding member and the retaining member are moved against the biasing force of the elastic member by pressing inward, and a pulling process in which the tube is disengaged from the retaining member due to the pressing process. The tube can be easily removed even when the surrounding area is narrow.

FIG. 1 is a sectional view of a first embodiment of a pipe joint according to the present invention. 2 is a perspective view and a partially enlarged view of the holding member in FIG. 1. FIG. FIG. 2 is a perspective view of the retaining member of FIG. 1; FIG. 3 is a sectional view of a connected state in which a pipe joint and a pipe are connected. FIG. 2 is a perspective view of a pressing jig attached to a pipe joint. FIG. 2 is a cross-sectional view of a state in which a pressing jig is attached to a pipe joint. FIG. 7 is a cross-sectional view of the holding member pressed with a pressing jig. It is a half sectional view of a 2nd embodiment of the pipe joint concerning the present invention. FIG. 3 is a half-sectional view of a third embodiment of a pipe joint according to the present invention. FIG. 10 is a half sectional view of the nut-like member shown in FIG. 9 in a slid state; 10 is a perspective view of the collar of FIG. 9; FIG.

A first embodiment of a pipe joint according to the present invention will be described based on FIG. 1. As shown in FIG. 1, the pipe joint 1 includes a substantially cylindrical housing 2 with both ends open. A retaining member 5 that engages with the outer peripheral surface of the tube, a holding member 4 that holds the retaining member 5, an elastic member 6, and a seal ring 3 are installed in the housing 2. In the pipe joint 1 of FIG. 1, a pipe is inserted through the insertion port 23 at one end of the housing 2 (on the right side in the figure), and another pipe is connected to the other end of the housing 2 (on the left side in the figure). Further, the pipe joint 1 further includes a pressing jig (for example, see FIG. 5) for pressing the holding member 4.

In the present invention, the direction along the central axis O of the housing 2 is referred to as the axial direction, and the direction orthogonal to the central axis O when viewed from the axial direction is referred to as the radial direction. The direction in which this occurs is called the circumferential direction. Further, among the above-mentioned axial directions, the direction in which the pipe is inserted into the pipe joint is referred to as the insertion direction, and the direction opposite to the insertion direction is referred to as the counter-insertion direction.

The housing 2 includes a housing body 21 and a spacer member 22 mounted within the housing body 21. A circumferential groove 211 for holding the seal ring 3 is formed in the inner wall surface of the housing body 21. Since the housing 2 requires corrosion resistance and rigidity, it can be formed by precision casting using a material such as SCS material or bronze material, for example.

The seal ring 3 is an elastically deformable rubber ring. The types of rubber used include EPDM, which is a ternary copolymer of ethylene, propylene, and a crosslinking diene monomer, olefin rubber, and fluororubbers such as tetrafluoroethylene-perfluoromethyl vinyl ether rubber (FFKM). can. Further, as shown in FIG. 1, the seal ring 3 preferably has a lip portion 31, and the lip portion 31 is in close contact with the outer circumferential surface of the tube. This ensures a predetermined surface pressure and high sealing performance.

In the housing 2, the inner circumferential surface of the spacer member 22 is formed with an inclined surface 221 whose diameter decreases as it advances in the anti-insertion direction. The elastic member 6 is arranged between the step portion 212 of the housing body 21 and the holding member 4. As the elastic member 6 urges the holding member 4 and the retaining member 5 in the anti-insertion direction, the outer peripheral surface 511 of the retaining member 5 comes into contact with the inclined surface 221 of the spacer member 22 . An inner circumferential groove is provided on the inner circumferential surface of the housing body 21 on the side of the insertion port 23, and a retaining ring 7 is fitted into the inner circumferential groove to prevent the spacer member 22 from slipping out. has been done.

As the elastic member 6, a compression coil spring or the like can be used. In FIG. 1, a truncated cone-shaped coil spring is formed by winding a wire so that the outer diameter increases from one end to the other, and the large diameter side is in contact with the stepped portion 212 of the housing body 21, and the small diameter side is in contact with the holding member 4. It is provided so as to come into contact with.

In the housing 2, a through hole 24 is formed on the outside of the holding member 4 in the radial direction, passing through the inside and outside of the housing 2 in the radial direction. Through this through hole 24, it is possible to visually observe the holding member 4 arranged inside the housing 2 (see, for example, FIG. 8). A plurality of through holes 24 are formed at intervals in the circumferential direction of the housing body 21. The shape of the through hole 24 is not particularly limited, and may be a rectangular shape, a circular shape, an elliptical shape, or the like. Further, the size of the through hole 24 may be a size that allows the holding member 4 located inside to be pressed, for example, a size that allows a protrusion of a pressing jig to be described later to be inserted therethrough. Specifically, the maximum length of the through hole 24 in the circumferential direction of the housing 21 is about 10 mm to 30 mm.

Next, the holding of the retaining member 5 by the holding member 4 will be explained using FIGS. 2 and 3. FIG. 2(a) is a perspective view of the holding member 4, and FIG. 2(b) is an enlarged view of section A thereof. As shown in FIG. 2(a), the holding member 4 is a substantially ring-shaped member, and has an annular flange portion 41 formed at one end that serves as a pedestal for the elastic member, and a plurality of holding pieces 42 at the other end. It is formed. The plurality of holding pieces 42 are arranged in parallel along the circumferential direction, and each holding piece 42 is divided by a holding groove 43 cut into a substantially rectangular shape. Note that, as will be described later, the flange portion 41 is brought into contact with the inclined surface of the projection of the pressing jig (see FIG. 7). Therefore, in order to facilitate contact with the inclined surface of the projection, it is preferable to cut out the corner of the end surface of the flange portion 41 on the side of the holding piece 42 to form an inclined surface corresponding to the inclined surface of the projection.

As shown in FIG. 2(b), substantially triangular locking portions 44 protruding into the holding groove 43 are formed on both side surfaces of the holding piece 42. As shown in FIG. A retaining member is fitted into this locking portion 44. Further, a circumferential groove 421 along the circumferential direction is formed on the outer peripheral surface of each holding piece 42, and a fastening ring (not shown) is attached so as to straddle the circumferential groove 421 and the retaining member. Note that the locking portion 44 may have any structure as long as it can prevent the retaining member from falling off from the holding member 4, and may be formed only on one side surface of the holding piece 42.

FIG. 3 is a perspective view of the retaining member 5. As shown in FIG. 3, the retaining member 5 has a chevron-shaped portion 51 and a clamping portion 52 formed at the bottom of the chevron-shaped portion. A step is provided between the chevron portion 51 and the clamping portion 52, and the width of the clamping portion 52 is set to the width of the chevron portion 51 so that the clamping portion 52 is fitted into the locking portion 44 of the holding member 4 shown in FIG. It is narrower than. The retaining member 5 is inserted into the retaining groove 43 of the retaining member 4, and is retained by the locking portion 44 at the step between the chevron portion 51 and the clamping portion 52, so that a plurality of retaining members 5 are retained along the circumferential direction of the retaining member 4. It is assembled into a pipe fitting in the state where it is installed.

Furthermore, a plurality of (four in FIG. 3) edge portions 521 are formed on the inner circumferential surface of the retaining member 5 in FIG. Providing the edge portion 521 makes it easier for the edge portion 521 of the retaining member 5 to bite into the outer circumferential surface of the tube when the tube is inserted, thereby further improving the ability to prevent the tube from being pulled out. Note that the retaining member is not limited to the configuration shown in FIG. 3 as long as it is held by the holding member 4 and has a shape that can be engaged with the outer circumferential surface of the tube. For example, the inner circumferential surface of the clamping part 52 may be formed in an arc shape without an edge part in order to fit into the expanded part of the tube.

Next, the state of connection between the pipe joint and the pipe will be explained using FIG. 4. In FIG. 4, the tube 11 is, for example, a steel tube made of SUS304, and an enlarged tube portion 12 having an arcuate cross section is formed at the tube end. When the tube 11 is inserted through the insertion port 23 of the housing 2 until the tip of the tube 11 hits the housing body 21, the expanded tube portion 12 fits into the edge portion 521 of the retaining member 5, and the connection is made with a single touch operation. is completed. In the connected state shown in FIG. 4, the holding member 4 and the retaining member 5 are pushed in the anti-insertion direction by the urging force of the elastic member 6, so that the outer circumferential surface 511 of the retaining member 5 comes into contact with the inclined surface 221, and the edge thereof The portion 521 closely engages with the outer peripheral surface of the expanded tube portion 12 . In this connected state, even if a pulling force is applied to the tube 11, the tube 11 will not be pulled out because the retaining member 5 bites into the outer peripheral surface of the tube 11. On the other hand, it may be necessary to remove the pipe 11 from the pipe fitting 1 during maintenance or replacement of the pipe.

Regarding the pipe removal mechanism, in the pipe joint 1 according to the present invention, the holding member 4 is pressed in the insertion direction from the outside in the radial direction through the through hole 24, so that the holding member 4 and the retaining member 5 are removed from the elastic member 6. It is characterized in that the engagement between the retaining member 5 and the pipe 11 is released by moving against the biasing force. According to this configuration, the engagement of the retaining member 5 can be released by pressing the holding member 4 from the outside in the radial direction in the insertion direction, so there is no need to use a tool along the axial direction of the pipe joint, and it is possible to release the engagement in the narrow space. Excellent workability.

As a means for pressing the holding member 4, for example, a pressing jig is used. Any pressing jig can be used as long as it can act from the outside in the radial direction of the holding member through the through hole and can press the holding member in the insertion direction. For example, a tool such as a screwdriver or a jig with a predetermined shape can be used. The pressing jig may be provided in the pipe fitting 1 in advance as a member constituting the pipe fitting. Examples of forms in which the pressing jig is provided include a form in which the pressing jig is held at a predetermined location of the pipe joint, and a form in which the pressing jig is bundled with the pipe joint. FIG. 5 shows an example of a pressing jig. As shown in FIG. 5, the pressing jig 8 is a substantially ring-shaped member having a notch 83 in a portion in the circumferential direction. A protrusion 82 that protrudes radially inward is provided on the inner circumferential surface of the ring body 81. In FIG. 5, four protrusions 82 are provided at equal intervals in the ring circumferential direction.

The pressing jig is not limited to the example shown in FIG. For example, the number of protrusions is not limited to four, and may be one, two, five or more. Further, when there are a plurality of protrusions, the intervals between the protrusions in the ring circumferential direction may be different from each other. In addition, in the example of FIG. 5, the protrusions are evenly arranged in the area of the inner peripheral surface of the ring body 81, but even if the protrusions are unevenly distributed (for example, arranged only on the side facing the notch). good. Further, the pressing jig may be formed into a semicircular ring shape.

In FIG. 5, each protrusion 82 has an asymmetrical cross-sectional shape in the axial direction. Specifically, it has an inclined surface 821 inclined toward one direction in the axial direction. This inclined surface 821 is formed of a flat surface or a curved surface, and serves as a pressing surface that presses the holding member 4. Further, the pressing jig is, for example, a molded body of synthetic resin. Examples of synthetic resins that can be used include polyamide (PA) resin, polycarbonate (PC) resin, polyacetal (POM) resin, polybutylene terephthalate (PBT) resin, and polyphenylene sulfide (PPS) resin.

A method for removing a pipe from a pipe joint using a pressing jig will be described with reference to FIGS. 6 and 7. FIG. 6 shows a state in which a pressing jig is attached to the pipe joint, and FIG. 7 shows a state in which the holding member is pressed by the pressing jig. In FIG. 6, the pressing jig 8 expands in diameter due to elastic deformation and is attached to the through hole 24 of the housing 2. Specifically, the opening width of the notch of the pressing jig 8 is expanded until it becomes larger than the outer diameter of the circumference of the housing 2 in which the through holes 24 are formed, and each protrusion 82 is inserted into each of the through holes 24. The pressing jig 8 is attached by fitting it in according to the position. In this case, the protrusion 82 is mounted so that the inclined surface 821 faces in the insertion direction, that is, in the direction in which the holding member 4 is moved. This allows smooth movement of the holding member 4.

By pushing the protrusion 82 inward in the radial direction with the pressing jig 8 attached, the inclined surface 821 of the protrusion 82 comes into contact with the flange portion 41 of the holding member 4, and the holding member 4 moves along the insertion direction. (See Figure 7). That is, since the inclined surface 821 is inclined, the holding member 4 is moved in the insertion direction by the pushing operation of the projection 82 in the radial direction. In this case, the holding member 4 and the retaining member 5, which are pushed in the anti-insertion direction by the elastic member 6, move in the insertion direction against the biasing force of the elastic member 6. This movement causes the retaining member 5 to separate from the spacer member 22, loosening the fit of the retaining member 5 to the tube 11, and thereby releasing the engagement between the retaining member 5 and the tube 11. At this time, the elastic member 6 is in a compressed state.

By applying a pulling force to the pipe 11 in a state in which the engagement of the retaining member 5 is released, the expanded pipe portion 12 rides over the retaining member 5, which is now movable in the radial direction, and removes the pipe 11 from the pipe fitting 1. be able to.

In the first embodiment, the housing 2 is made up of the housing main body 21 and the spacer member 22, which are separate members, but these may be made up of a single member (only the housing main body). In this case, the inner wall surface of the housing main body 21 on the side of the insertion port may be formed into an inclined surface whose diameter decreases in the opposite direction of insertion, and the retaining member may be pressed against the inclined surface.

A second embodiment of the pipe joint according to the present invention will be described based on FIG. 8. FIG. 8 is a half-sectional view of the pipe joint connected to a pipe, with the upper half showing the cross-sectional view and the lower half showing the side view. In FIG. 8, the housing 2 includes a housing body 21 and a nut-like member 25 fixed to one end of the housing body 21. The housing main body 21 and the nut-like member 25 are fixed by, for example, screwing together a male thread provided on the outer peripheral surface of the housing main body 21 and a female thread provided on the inner peripheral surface of the nut-like member 25. .

A seal ring 3 is built into the housing body 21, and a holding member 4 holding a retaining member 5 is provided inside the nut-shaped member 25. An elastic member 6 is disposed between the holding member 4 and the housing body 21, and the elastic member 6 urges the holding member 4 and the retaining member 5 in the anti-insertion direction. In the connected state shown in FIG. 8, the outer circumferential surface 511 of the retaining member 5 is in contact with the inclined surface 251, and the edge portion 521 is closely engaged with the outer circumferential surface of the expanded tube portion 12. This prevents the tube 11 from coming off.

Further, in the nut-shaped member 25, a through hole 24 is formed on the radially outer side of the holding member 4. A plurality of (for example, four) through holes 24 are provided at intervals in the circumferential direction of the nut-like member 25, and the projections of the pressing jig as described above can be fitted into the through holes 24. In the pipe joint 1 of FIG. 8 as well, by pressing the holding member 4 in the insertion direction from the outside in the radial direction through the through hole 24, the holding member 4 and the retaining member 5 move along the insertion direction, and the retaining member 4 is prevented from being removed. The engagement of the member 5 can be released.

As described above, the pipe joints of the first and second embodiments are configured such that the holding member is pressed in the insertion direction from the outside in the radial direction and the engagement of the retaining member is released, so that the circumference of the pipe is The tube can be easily removed even in narrow spaces. On the other hand, the holding member may be pressed unintentionally due to unexpected contact or erroneous operation. In such a case, there is a risk that the engagement of the retaining member will be released and the tube will come out.

To deal with this problem, FIG. 9 shows a third embodiment of a pipe joint provided with a locking mechanism that locks the release of the engagement of the retaining member. As shown in FIG. 9, the housing 2 of the pipe joint 1 includes a housing body 21 and a nut-shaped member 25 attached to one end of the housing body 21. As shown in FIG. This pipe joint 1 is different from the pipe joint shown in FIG. 8 in that a nut-like member 25 is configured to be slidable with respect to the housing body 21, and the movement of the holding member 4 is caused by sliding the nut-like member 25. limited. FIG. 9 shows the state before the nut-like member 25 slides, and FIG. 10 shows the state after the nut-like member 25 slides.

In FIG. 9, two inner circumferential grooves 252 and 253 are formed on the inner wall surface of the nut-shaped member 25. As shown in FIG. Of the two circumferential grooves, the inner circumferential groove 252 is on the downstream side in the insertion direction, and the inner circumferential groove 253 is on the upstream side in the insertion direction. A part of the retaining ring 9 is fitted into the inner circumferential groove 252 of the nut-shaped member 25, and the remaining part is fitted into the outer circumferential groove of the housing body 21, so that the housing body 21 and the nut-shaped member 25 are coupled. ing. Further, a gap is provided between the housing body 21 and the nut-shaped member 25 in the axial direction. A gap is formed along the circumferential direction of the housing 2, and a collar 10 is fitted into the gap. In the state shown in FIG. 9, the collar 10 is interposed in the gap, so the nut-shaped member 25 cannot slide in the insertion direction. In other words, the collar 10 serves as a regulating member that regulates the sliding of the nut-shaped member 25. In addition, also in the pipe joint 1 of FIG. 9, the engagement of the retaining member 5 can be released by pressing the holding member 4 through the through hole 24.

As shown in FIG. 11, the collar 10 includes a substantially C-shaped main body portion 101 that fits into a gap, and a grip portion 102 that is gripped by an operator. The collar 10 is, for example, a molded body of synthetic resin. Examples of synthetic resins that can be used include PA resin, PC resin, POM resin, PBT resin, and PPS resin.

When the collar 10 is pulled out from the state shown in FIG. 9 and the nut-shaped member 25 is pushed in the insertion direction, the retaining ring 9 moves along the inclined surface of the inner circumferential groove 252 (the side wall surface on the side opposite to the insertion direction). and is pushed into the outer circumferential groove of the housing body 21. Thereafter, the retaining ring 9 is fitted into the inner circumferential groove 253 of the nut-shaped member 25 (see FIG. 10).

As shown in FIG. 10, when the nut-shaped member 25 is slid, the elastic member 6 is compressed between the housing 2 and the holding member 4. As shown in FIG. In other words, as the compression margin of the elastic member 6 becomes smaller, the movement stroke of the holding member 4 becomes smaller. As a result, even if the holding member 4 is pressed in this state, the movement of the holding member 4 is restricted and the engagement of the retaining member 5 is maintained. Note that in FIG. 10, the elastic member 6 is completely compressed and the holding member 4 cannot be moved, but this locking mechanism is designed so that the holding member 4 is not moved to the extent that the engagement of the retaining member 5 is maintained. Any configuration may be used as long as movement is restricted.

In this way, the pipe joint 1 of FIG. 10 is configured such that the nut-like member 25 is slidable in the insertion direction with respect to the housing body 21, thereby making it possible to remove the pipe 11 by pressing in the state before sliding. In the state after sliding, it is possible to prevent the tube from coming off due to unintentional pressure.

In each of the embodiments described above, a tube having an enlarged tube end formed at the tube end is used as the tube connected to the tube joint, but the present invention is not limited thereto. For example, it is also possible to use a tube with no expanded tube portion and a constant outer diameter. In addition to stainless steel pipes, resin pipes can also be used.

Furthermore, in each of the above embodiments, one end of the substantially cylindrical housing is used as the insertion port, and the tube is inserted from one side, but the tube may be inserted from both sides of the housing. . Further, the housing may be formed into a cylindrical shape with a bottom, one end of the housing may be used as an insertion port, and the other end may be closed. A pipe joint having such a configuration is used, for example, as a cap for a hydraulic test. When constructing long pipes, such as along railway lines, it is necessary to conduct water pressure tests for each section, and caps must be attached and removed from the end pipes each time. By using it as a tool, it becomes easy to install and remove, and work efficiency can be improved.

The pipe fitting of the present invention prevents the pipe from coming off and allows the pipe to be easily removed even in narrow spaces around the pipe, so it can be widely used as a pipe joint, and is especially suitable for re-construction such as maintenance and replacement. Suitable for pipe fittings in frequent piping.

1: Pipe joint 2: Housing 21: Housing body 211: Circumferential groove 22: Spacer member 221: Inclined surface 23: Insertion port 24: Through hole 25: Nut-shaped member 251: Inclined surface 252: Inner circumferential groove 253: Inner circumference Groove 3: Seal ring 31: Lip portion 4: Holding member 41: Flange portion 42: Holding piece 421: Circumferential groove 43: Holding groove 44: Locking portion 5: Retaining member 51: Chevron portion 511: Outer peripheral surface 52: Narrow Attachment part 521: Edge part 6: Elastic member 7: Retaining ring 8: Pressing jig 81: Ring body 82: Protrusion 821: Inclined surface 83: Notch part 9: Retaining ring 10: Collar 101: Collar main body part 102: Grip part 11: Pipe 12: Expanded pipe part

Claims (7)

a substantially cylindrical housing into which a tube is inserted from at least one end and a sealing member that is in close contact with the outer peripheral surface of the tube; A pipe in which a holding member that holds a plurality of retaining members that are engaged with the outer circumferential surface of the pipe along the circumferential direction , and an elastic member that biases the retaining members and the retaining member in an anti-insertion direction are arranged. A joint,
The holding member is a substantially ring-shaped member, and a through hole is formed on the outside in the radial direction of the holding member, and the through hole extends in the circumferential direction of the housing. Multiple pieces are formed at intervals,
When connected to the pipe, the holding member is pressed in the insertion direction from the outside in the radial direction at a plurality of locations through the through hole, so that both the holding member and the retaining member are attached to the elastic member. A pipe joint, characterized in that the engagement between the retaining member and the pipe is released by moving against a force. The housing includes a housing body in which the sealing member is built-in, and a nut-shaped member attached to one end of the housing body, and the through-hole is formed in the nut-shaped member, and the inner side of the through-hole is formed in the nut-shaped member. is provided with the holding member,
The pipe joint according to claim 1, wherein the elastic member is disposed between the holding member and the housing body. The nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed and the holding member is moved. 3. The pipe fitting according to claim 2 , wherein: a substantially cylindrical housing into which a tube is inserted from at least one end and a sealing member that is in close contact with the outer peripheral surface of the tube; A pipe joint in which a holding member that holds a retaining member that is engaged with an outer circumferential surface of a pipe, and an elastic member that biases the retaining member and the retaining member in a counter-insertion direction,
A through hole passing through the inside and outside of the housing in the radial direction is formed on the radially outer side of the holding member,
In the state connected to the pipe, the holding member is pressed in the insertion direction from the outside in the radial direction through the through hole, so that the holding member and the retaining member resist the urging force of the elastic member. moving, the engagement between the retaining member and the tube is released;
The housing includes a housing body in which the sealing member is built-in, and a nut-shaped member attached to one end of the housing body, and the through-hole is formed in the nut-shaped member, and the inner side of the through-hole is formed in the nut-shaped member. is provided with the holding member,
the elastic member is disposed between the holding member and the housing main body,
The nut-shaped member is slidably attached to the housing body in the insertion direction, and by sliding the nut-shaped member in the insertion direction, the elastic member is compressed and the holding member is moved. A pipe joint characterized in that: The pipe joint further includes a pressing jig for pressing the holding member,
1. The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a protrusion that can be inserted into the through hole is formed on the inner circumferential surface of the pressing jig. The pipe joint according to any one of claims 1 to 5. 5. The protrusion of the pressing jig has an inclined surface inclined toward one direction in the axial direction, and the inclined surface is pressed by coming into contact with the holding member. Pipe fittings described in . A method for removing a pipe from a pipe joint using a pressing jig, the method comprising:
The pipe joint includes a substantially cylindrical housing into which a pipe is inserted from at least one end, and a sealing member that is in close contact with the outer peripheral surface of the pipe. a holding member that holds a plurality of retaining members that are engaged with the outer circumferential surface of the tube along the circumferential direction ; and an elastic member that biases the retaining members and the retaining members in the anti-insertion direction. is arranged, the holding member is a substantially ring-shaped member, and a through hole is formed on the radially outer side of the holding member, passing through the inside and outside of the housing along the radial direction, and the through hole is connected to the housing. Multiple pieces are formed at intervals in the circumferential direction of the
The pressing jig is a substantially ring-shaped member having a notch in a part in the circumferential direction, and a plurality of protrusions that can be inserted into the through hole are formed on the inner peripheral surface thereof,
The method for removing the pipe includes expanding the diameter of the pressing jig in a state where the pipe joint and the pipe are connected, and using the pressing jig so that the protrusion fits into the through hole of the housing. a mounting step of mounting, and a pressing step of pressing the protrusion of the mounted pressing jig radially inward to move both the holding member and the retaining member against the biasing force of the elastic member. . A method for removing a tube, comprising a pulling step of pulling out the tube that has been disengaged from the retaining member by the pressing step.

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