JP7136644B2 - pipe joint - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint that is used to connect connecting pipes including water supply pipes, hot water supply pipes, etc., and seals in a watertight state.

Conventionally, there has been known a pipe joint in which a connecting pipe can be inserted between an inner cylinder and an outer cylinder of a joint body in which a fluid passage is formed. In this pipe joint, a water-stopping member is attached to a groove formed in the outer peripheral surface of the inner cylinder, and a water-tight water-stopping structure is provided between the water-stopping member and the inner peripheral surface of the inserted connecting pipe. . When inserting the connecting pipe into the joint body, if the tip surface (pipe end) of the connecting pipe is cut obliquely or the direction of insertion is tilted, the compression action of the connecting pipe against the water cutoff member will be biased and the water cutoff member will be damaged. may deviate from its proper position in the groove, impairing water stoppage performance.

As a technique for improving such problems, for example, a plug-in type pipe joint described in Patent Document 1 has been proposed. In this pipe joint, an annular guide ring having a substantially V-shaped cross section is arranged in a connecting pipe insertion hole between an inner cylinder and an outer cylinder of a joint body. As a result, even if the tip surface of the connecting pipe is cut obliquely or is inclined in the direction in which the connecting pipe is inserted, the tip surface of the connecting pipe pushes the guide ring to overcome the water cutoff member and compress the water cutoff member. It suppresses the occurrence of bias in action.

JP 2009-299863 A

However, in the pipe joint described in Patent Document 1, the guide ring is arranged on the front side of the retainer ring before the connection pipe is inserted, and is locked with a slight gap between the water stop member. Deployed to avoid detachment. In addition, the guide ring should be locked and held with a small force between the retaining ring and the water stop member in order to minimize the resistance force when the connecting pipe is pushed by the tip end face and moved when the connecting pipe is inserted. Only.
Therefore, the guide ring is not held stably. For example, if the pipe joint is dropped or if it collides with another member and receives an impact, the guide ring will be displaced or detached and inserted. There is a problem that the connecting pipe cannot be guided.

In addition, if the connecting pipe is stopped while being inserted into the joint main body, the guide ring will separate from the tip of the connecting pipe if a repulsive force or an external impact occurs after the waterproof member is compressed by the connecting pipe. Gaps may occur. If a gap occurs, the guide ring cannot exhibit the effect of guiding the advance of the connecting pipe when the distal end surface of the connecting pipe moves forward while filling the gap with the guide ring. Moreover, if the tip of the connecting pipe is cut diagonally or inserted in an oblique direction, the pushed water stop member may move out of its proper position in the groove of the inner pipe, impairing the water stop performance. be.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems. To provide a pipe joint capable of preventing detachment and impairing water stopping performance between a connecting pipe.

A pipe joint according to the present invention comprises a joint body having a fluid passage on the inner peripheral side of a cylindrical guide portion and a guide passage for pushing a connecting pipe on the outer peripheral side; between the first protrusion and the second protrusion of the water stop member for stopping water between the connection pipe and the portion and the second protrusion arranged along the pushing direction of the connection pipe; and an insertion guide that serves as a guide when the connection pipe is pushed into the guide passage.
According to the present invention, since the insertion guide is provided between the first protrusion and the second protrusion of the water stop member within the guide passage for pushing the connecting pipe, it can be stably supported and the pipe joint can be dropped. The position does not shift even if there is an impact such as a collision with another member. Therefore, even if the tip of the connecting pipe is cut obliquely or is inclined in the direction of insertion, the connecting pipe can be inserted into the guide passage and the insertion guide can be pushed in, so that the water stop member can be overcome and the position of the water stop member can be prevented. It is possible to exhibit water stopping performance between the connecting pipe by suppressing it.

Moreover, it is preferable that the water stop member does not have water stop performance between the first convex portion near the pushing direction of the connecting pipe and the connecting pipe.
By pushing the connecting pipe halfway into the guide passage of the joint body and pressing the first convex part of the water stop member to make it clear that the water is not stopped, pushing the connecting pipe further to the back side ensures It was set to stop water at

Moreover, a through-groove may be formed in the first convex portion along the pushing direction of the connection pipe.
Even if the first convex portion of the water cutoff member is pressed and compressed by the connecting pipe, the through groove is formed, so water cutoff cannot be exhibited.

Moreover, it is preferable that the second convex portion is water-stopped between the pushed-in connection pipes.
Clearly clarifies that the water cannot be stopped when the connecting pipe is pushed into the guide passage and crossed over the first protrusion of the water stop member, and that the water can be stopped by pushing it inward and overcoming the second protrusion and compressing it. did.

Moreover, it is preferable that one of the inner peripheral surface of the water stop member and the outer peripheral surface of the guide portion is formed with a projection, and the other is formed with a concave portion into which the projection is fitted.
Even if the water-stopping member is pushed by the connecting pipe, the water-stopping member is engaged with the protrusion and the recess of the guide portion, so that displacement in the push-in direction can be prevented. Moreover, since the water stop member is restrained from being deformed in the radial direction by the insertion guide, it is possible to prevent the water stop member from being pushed by the connecting pipe and being displaced in the radial direction.

In addition, it is preferable that a retaining member that prevents the connection pipe from being pulled out is provided in the guide passage on the inlet side of the insertion guide.
Since the insertion guide is installed forward in the pushing direction from the retainer member of the connecting pipe, it is possible to reduce pushing resistance when pushing the insertion guide with the connecting pipe.

According to the pipe joint of the present invention, since the insertion guide can be held between the first projection and the second projection of the water stop member before the connecting pipe is inserted, the insertion guide can be stably locked and held. For example, even when the pipe joint is dropped or collided with another member and receives an impact, it is possible to prevent the insertion guide from being dislocated or detached. Therefore, when the connecting pipe is pushed in, it can be reliably guided by the insertion guide, and water cutoff can be ensured between it and the water cutoff member.
Moreover, since the present invention can be realized by the insertion guide and the water stop member without adding other members, the assembling workability is easy and the increase in cost can be suppressed.

1 is a cross-sectional view of a main part of a pipe joint according to an embodiment of the present invention; FIG. FIG. 2 is an enlarged view of a waterproof member installed in a joint body of the pipe joint shown in FIG. 1; FIG. 3 is a cross-sectional view of the entire periphery of the waterproof member shown in FIG. 2 including the AA line portion; FIG. 5 is a cross-sectional view of a stage where the connecting pipe is inserted halfway into the guide passage of the joint body; FIG. 4 is a cross-sectional view of the connecting pipe inserted deep into the guide passage of the joint body. FIG. 4 is a cross-sectional view similar to FIG. 3 of a water stop member according to a modification; FIG. 7 is a cross-sectional view along line BB of the waterproof member shown in FIG. 6;

A pipe joint according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5. FIG.
As shown in FIG. 1, the pipe joint 1 according to the embodiment of the present invention includes a joint main body 2 as a joint main body water passage portion 4 having a fluid passage 3 and a tip end side (connection) as a part of the joint main main water passage portion 4 . It has a cylindrical guide portion 5 formed with a reduced diameter on the side). Further, the joint main body 2 roughly includes a substantially cylindrical outer body 6 fitted to the outer peripheral side of the guide portion 5 and a cylindrical nut portion 7 meshed and connected to the distal end side of the outer body 6. is prepared. A substantially tubular inner body 10 is mounted inside the outer body 6 and the nut portion 7 .

A guide passage 9 into which the connection pipe S is inserted is formed between the guide portion 5 of the joint body water passage portion 4 and the inner body 10 and the nut portion 7 inside the outer body 6 . In addition, the outer body 6 and the inner body 10 may be integrally formed as a tubular body on the outer peripheral side of the guide portion 5 .
In the pipe joint 1 shown in FIG. 1, the insertion side (the right side in the figure) of the connecting pipe S in the guide passage 9 formed in the joint body water passage 4 is the inlet 9a side, and the far side in the insertion direction in the figure (the right side in the figure). middle, left side) is the back portion 9b side.

One end portion 6a of the outer body 6 is fitted in a recessed groove 4a formed on the back side of the joint body water passage portion 4, and a male screw portion 6b is formed on the outer peripheral surface stepped portion on the insertion side. A female threaded portion 7a formed on the inner peripheral surface of the nut portion 7 is screwed into the male threaded portion 6b. An opening 7c is formed on the insertion side of the female threaded portion 7a of the nut portion 7, the inner peripheral surface of which is further reduced in diameter via a stepped portion 7b. An entrance 9a of the guide passage 9 is formed between the opening 7c of the nut portion 7 and the tip of the guide portion 5. As shown in FIG.

A substantially annular inner body 10 is attached to the inner peripheral surfaces of the outer body 6 and the nut portion 7 in the region of the female screw portion 7a. An inner peripheral surface 10a of the inner body 10 is formed in a substantially cylindrical shape, and an enlarged diameter portion 10b having a larger diameter than the inner peripheral surface 10a is formed on the insertion side thereof. It has a stepped shape fitted to the connecting portion.
An annular retainer ring 12 is fixed to the insertion side end of the expanded diameter portion 10b of the inner body 10 to prevent the later-described connection pipe S from being pulled out. A substantially annular guide passage 9 is formed between the inner peripheral surface 10 a of the inner body 10 and the guide portion 5 . Moreover, the inner body 10 has a rear end portion 10c curved toward the guide portion 5, and the space of this portion serves as a rear portion 9b of the guide passage 9. As shown in FIG.

The retainer ring 12 has a base portion 12a fixed to the end surface of the enlarged diameter portion 10b of the inner body 10 and a locking portion 12b inclined from the base portion 12a toward the inner portion 9b. The retainer ring 12 is made of, for example, stainless steel, and is formed with a plurality of notches at the locking portion 12b so that each ring can be elastically deformed in the expansion/contraction direction. Moreover, the plurality of engaging portions 12b engage with the inserted connecting pipe S, and when the connecting pipe S is pulled out, the engaging portions 12b engage with the connecting pipe S, thereby preventing withdrawal. .
The retaining ring 12 may be fixed by being sandwiched between the enlarged diameter portion 10b and the inner peripheral surface of the nut portion 7, with the base portion 12a having a substantially L-shaped cross section.

A concave groove 14 is formed in a ring shape over a predetermined width at a position facing the inner peripheral surface 10a of the inner body 10 on the outer peripheral surface of the guide portion 5 of the joint main body water communicating portion 4 . A water stop member 15 having a substantially annular shape is installed in the concave groove portion 14 . The water stop member 15 is an elastic member that seals the entire periphery watertightly with the connecting pipe S inserted in the guide passage 9, and is made of synthetic rubber, natural rubber, synthetic resin, etc., for example, chlorine-resistant rubber. The member is formed of EPDM.
In the waterproof member 15, a first convex portion 16 and a second convex portion 17 are integrally formed in a ring shape in the circumferential direction along the insertion direction of the connection pipe S on the surface of the outer peripheral side of the cylindrical base portion 15a. there is The first projection 16 is formed on the insertion side (the entrance 9a side) in the guide passage 9, and the second projection 17 is formed on the back side (the back portion 9b side). A concave portion 18 is formed over the entire circumference between the first convex portion 16 and the second convex portion 17 .

In the example shown in FIG. 2, the first convex portion 16 is formed to have a substantially sawtooth cross section, the second convex portion 17 is formed to have a substantially semicircular cross section, and the concave portion 18 is formed between the first convex portion 16 and the second convex portion. The cross section is formed in a substantially horizontal line shape connecting the portions 17 . In addition, the first projection 16 having a sawtooth cross section has an inclined surface 16a on the insertion side and a substantially vertical surface on the back side (second projection 17 side). Even if it abuts on the inclined surface 16a of the first projection 16, it can smoothly overcome the inclined surface 16a while pressing the inclined surface 16a.
In addition, since the second convex portion 17 is formed to have a substantially semicircular cross section, the connection pipe S can be watertightly sealed with the peripheral surface of the connection pipe S that pushes the top portion of the connection pipe S over the top portion thereof. . The first convex portion 16, the recessed portion 18, and the second convex portion 17 of the water cutoff member 15 can be formed in an appropriate cross-sectional shape.

Moreover, in FIG. 1, an annular insertion guide 20 is mounted in the concave portion 18 as a guide ring for guiding the insertion of the connecting pipe S into the guide passage 9. As shown in FIG. The insertion guide 20 is made of, for example, rigid resin such as PP, synthetic rubber, natural rubber, or the like, and is formed in a substantially arrow shape having an enlarged diameter portion only on the outer peripheral side when viewed in cross section. Alternatively, the insertion guide 20 may be formed in a substantially V-shaped cross section, and the shape can be appropriately selected. The rear end of the insertion guide 20 placed on the concave portion 18 abuts on the first convex portion 16 , and the portion near the distal end portion is placed on the second convex portion 17 . The enlarged diameter portion is in contact with the inner peripheral surface 10 a of the inner body 10 .
In this embodiment, since the insertion guide 20 is installed on the water stop member 15 on the back side of the retaining ring 12 in the guide passage 9, when the connection pipe S is inserted, the insertion guide 20 serving as a guide for the retaining ring 12 Easier insertion without the need to pass through

The insertion guide 20 has its upper and lower side portions abutted and supported by the water shutoff member 15 and the inner peripheral surface 10a of the inner body 10, and its rear end portion is fitted into the concave portion 18 of the water shutoff member 15 to form a second guide. It is abutted and supported by one convex portion 16 . Therefore, even if the pipe joint 1 is accidentally dropped or collides with another member, it is possible to prevent the insertion guide 20 from being displaced due to the impact.
Moreover, through grooves 22 are formed in the first convex portion 16 of the water stop member 15 at predetermined intervals in the circumferential direction. The through groove 22 is cut through the first convex portion 16 in a direction along the central axis O of the fluid passage 3 to have, for example, a substantially U-shaped or substantially V-shaped cross section. Therefore, even if the connection pipe S inserted into the guide passage 9 abuts against the first convex portion 16 and is compressed, the through groove 22 does not provide a watertight seal. Moreover, since the through grooves 22 are formed at predetermined intervals in the circumferential direction, the first convex portion 16 is easily deformed and compressed when the connecting pipe S presses the first convex portion 16 .

On the other hand, when the connecting pipe S presses the second convex portion 17, the second convex portion 17 is formed so as to protrude in a ring shape with the same diameter over the entire circumference, so that the second convex portion 17 is surely compressed to stop the water. be able to.
As a result, when the connection pipe S is inserted halfway through the guide passage 9 and presses only the first convex portion 16 of the water stop member 15, the through groove 22 cannot exhibit the water stop performance, and the inner portion 9b. When the insertion guide 20 is pushed in, the connecting pipe S presses the second convex portion 17 to ensure sufficient water stopping performance.

For example, a ring-shaped concave portion 23 is formed on the inner peripheral surface of the water stop member 15, and a ring-shaped or dot-shaped or the like is formed on the bottom surface 14a of the concave groove portion 14 of the guide portion 5 so as to fit and lock the concave portion 23. are formed. Therefore, even if the water stop member 15 is pushed directly by the connection pipe S or indirectly via the insertion guide 20, it is possible to reliably prevent the water stop member 15 from being displaced or deformed and detached from the concave groove portion 14.例文帳に追加

The pipe joint 1 according to this embodiment has the structure described above, and a method for inserting the connection pipe S will now be described mainly with reference to FIGS. 4 and 5. FIG. Since the connection pipe S is cut at the construction site, the tip surface (pipe end) of the connection pipe may be cut obliquely.
In the pipe joint 1 shown in FIG. 1 , the joint main body 2 before the connecting pipe S is inserted into the guide passage 9 is inserted into the guide passage 9 so that the insertion guide 20 is positioned between the first projection 16 of the water stop member 15 and the second projection. It is placed on the concave portion 18 between the portions 17 and is brought into contact with the inner peripheral surface 10a of the inner body 10 on the opposite side. Therefore, the insertion guide 20 can be reliably locked and held. It is possible to prevent the insertion guide 20 from being displaced or detached due to an external impact such as dropping the pipe joint 1 or colliding with another member.

Then, in order to fit the connecting pipe S to the pipe joint 1, the connecting pipe S is pushed into the guide passage 9 through the inlet 9a between the guide portion 5 of the joint main body water passage portion 4 and the opening 7c of the nut portion 7. As shown in FIG. In the guide passage 9, the connecting pipe S pushes open the plurality of engaging portions 12b of the retainer ring 12 to expand the diameter thereof, thereby connecting the inner peripheral surface 10a of the inner body 10, the water stop member 15, and the guide portion 5. inserted in between.

As shown in FIG. 4 , the connection pipe S pushes the inclined surface 16 a of the first projection 16 of the water stop member 15 with its tip surface, deforms while being guided, and overcomes the first projection 16 and the second projection 17 . The rear end portion of the insertion guide 20 placed in the concave portion 18 is pushed toward the inner portion 9b. At this position, the connecting pipe S presses the first projection 16 of the water stop member 15 , but the insertion position of the connecting pipe S is only an intermediate stage in the guide passage 9 . Since the through grooves 22 are formed in the first convex portion 16 at predetermined intervals, even if it is compressed by the connection pipe S, the first convex portion 16 will not be in a watertight state.

In this embodiment, since a plurality of through grooves 22 are formed at predetermined intervals in the circumferential direction of the first projection 16 of the water stop member 15, the first projection 16 is compressed by the connection pipe S to overcome. The resistance becomes uniform in the circumferential direction. Therefore, deformation of the first convex portion 16 is suppressed, oblique insertion due to inclination of the connection pipe S is suppressed, and displacement of the waterproof member 15 is suppressed. Further, since the connection pipe S and the water stop member 15 have not reached the water stop state, it can be recognized that the connection pipe S is being inserted in the middle.

Further, when the connection pipe S is pushed into the guide passage 9, the rear end of the insertion guide 20 is pushed over the first projection 16 of the water stop member 15, and the insertion guide 20 moves between the water stop member 15 and the inner body 10. It advances while abutting against the inner peripheral surface 10a. Therefore, even if the connecting pipe S has its tip end cut obliquely or is inserted with an inclination, it passes through while being guided by the insertion guide 20 and compressing the first projection 16 and the second projection 17 of the water stop member 15 . Then, it is smoothly inserted without being caught by the water cutoff member 15.例文帳に追加
By further pushing the connection pipe S into the guide passage 9, the insertion guide 20 contacts the inner peripheral surface 10a of the inner body 10 and compresses the second convex portion 17 of the water stop member 15 to get over it. In this way, the insertion guide 20 is pushed into the dead end deep portion 9b of the guide passage 9, and the front end surface of the connection pipe S is also pushed into the deep portion 9b, pressing the second convex portion 17 of the water stop member 15 over the entire circumference. and compress. Then, the inner peripheral surface of the connection pipe S and the second convex portion 17 can be waterproofed over the entire circumference.

Further, when a pullout force is applied to the connection pipe S inserted and held in a watertight state between the second convex portion 17 of the water stop member 15, the plurality of locking portions 12b of the retainer ring 12 are reduced in diameter. and bite into the outer peripheral surface of the connection pipe S to lock it. Therefore, the retaining ring 12 can prevent the connection pipe S from being pulled out.

As described above, according to the pipe joint 1 of the present embodiment, the insertion guide 20 is placed in the concave portion 18 between the first convex portion 16 and the second convex portion 17 of the water stop member 15 within the guide passage 9. In addition, since it is brought into contact with the inner peripheral surface 10a of the inner body 10, the insertion guide 20 before the connection pipe S is inserted can be reliably locked and held. It is possible to prevent the insertion guide 20 from being dislocated or detached even if an external impact such as dropping of the pipe joint 1 or collision with another member occurs.
Moreover, since the recess 23 provided on the inner peripheral surface of the water stop member 15 and the projection 24 provided on the bottom surface 14a of the groove 14 are fitted together, the water stop member 15 can be connected directly to the connection pipe S or via the insertion guide 20. Deformation and displacement can be prevented even when pushed, and the water stop member 15 does not come off from the recessed groove 14. - 特許庁

Moreover, since the pipe joint 1 can exhibit the above-described effects without increasing the number of parts, the assembling process is not complicated and the increase in cost can be suppressed.
Further, even if the connecting pipe S is inserted into the guide passage 9, the water stopping performance cannot be exhibited in the middle stage of compressing the first convex portion 16 of the water stopping member 15, and the insertion guide 20 does not reach the deep portion 9b. By inserting and compressing the second projecting portion 17, the connection pipe S can be reliably inserted up to a predetermined position in the inner portion 9b of the guide passage 9, because the connecting pipe S can exert a waterproof function.

Although the pipe joint 1 according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the invention. Modifications of the present invention will be described below, but members and portions that are the same as or similar to those of the above-described embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted.

6 and 7 show modifications of the water stop member 15 according to the embodiment.
The through grooves 22 formed in the first convex portion 15 of the water stop member 15 are preferably formed at equal intervals in the circumferential direction. It is sufficient if it does not have water stopping performance between This will be described as a modified example below.
A water shutoff member 30 according to the modification shown in FIG. 6 is formed in an annular shape in the same manner as the water shutoff member 15 according to the embodiment. , with recesses 18 formed therebetween. In this modified example, only one through groove 31 is formed in the first convex portion 16 so as to penetrate in the central axis O direction. As shown in FIG. 6, the through groove 31 is formed, for example, in a substantially V-shaped cross section.
In the water stop member 30 according to this modification, since only one through groove 31 is formed in the first protrusion 16 of the water stop member 30, when the connecting pipe S compresses the first protrusion 16 and climbs over it, becomes small only around the through groove 31 .

In the pipe joint 1 according to the above-described embodiment, the recesses 23 are formed on the inner peripheral surfaces of the water stop members 15 and 30, and the protrusions 24 that fit into the recesses 23 are formed on the bottom surface 14a of the recessed groove portion 14 of the guide portion 5. However, instead of this, the projections 24 may be formed on the inner peripheral surfaces of the water stop members 15 and 30, and the recesses 23 may be formed on the outer peripheral surface of the guide portion 5 and fitted.
Alternatively, the recesses 23 and the projections 24 may not be provided on the water stop members 15 and 30 and the guide portion 5 . In this case, it is preferable that the concave groove portion 14 in the guide portion 5 is formed to such an extent that the water stop members 15 and 30 are fitted without a gap.

Further, in the joint main body 2, the inner body 10 may be omitted and only the outer body 6 may be provided. In this case, the guide passage 9 may be formed between the inner peripheral surface of the outer body 6 and the outer peripheral side of the guide portion 5 , and the retainer ring 12 may be attached to the outer body 6 .
Also, a convex portion may be provided on the inner peripheral surface of the insertion guide 20 other than the rear end portion so as to engage with the first convex portion 16 of the water stop member 15 .

1 Pipe joint 2 Joint main body 3 Fluid passage 5 Guidance portion 6 Outer body 7 Nut portion 9 Guidance passage 10 Inner body 10a Inner peripheral surface 12 Retaining ring 14 Groove portions 15, 30 Water stop member 16 First convex portion 17 Second convex portion Part 18 Recess 20 Insertion guides 22, 31 Through groove 23 Recess 24 Projection S Connection pipe

Claims (6)

a joint body having a fluid passage on the inner peripheral side of a cylindrical guide portion and a guide passage for pushing the connecting pipe on the outer peripheral side;
A first annular projection and a second annular projection are arranged on the outer peripheral surface of the guide portion in this order from the entrance side toward the back side along the pushing direction of the connection pipe, and provide a space between the guide portion and the connection pipe. a water stop member that stops water;
As a separate member from the water stop member, it is provided between the first convex portion and the second convex portion of the water stop member in the guide passage, and the first an insertion guide that abuts on the projection and serves as a guide when pushing the connection pipe into the guide passage;
A pipe joint comprising: 2. The pipe joint according to claim 1, wherein said water stop member does not have water stop performance between said first projection near said connection pipe and said connection pipe. 3. The pipe joint according to claim 2, wherein a through groove is formed in the first projection along the pushing direction of the connection pipe. 4. The pipe joint according to any one of claims 1 to 3, wherein the second convex portion stops water between the pushed-in connecting pipe. 5. The water-stopping member according to any one of claims 1 to 4, wherein a projection is formed on one of the inner peripheral surface of the water stop member and the outer peripheral surface of the guide portion, and a recess for fitting the projection is formed on the other. pipe fittings. 6. The pipe joint according to any one of claims 1 to 5, wherein a retaining member for restraining withdrawal of the connection pipe is provided in the guide passage on the inlet side of the insertion guide.

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