Anti-disengagement device and its claw member

Abstract

To provide a separation prevention device which reliably prevents removal of a spigot pipe from the socket side without causing damage of claw members and housing recessed parts, and to provide the claw members of the separation prevention device.SOLUTION: A separation prevention device 15 has: housing recessed parts 16 which are formed at the socket side relative to a spigot pipe 11 and opened toward an inner periphery direction; and claw members 200 respectively housed in the housing recessed parts 16 in a tiltable manner. In the housing recessed part 16, a support wall 16a which supports and tilts one side wall of the claw member 200 is provided extending in a circumferential direction. In the side wall of the claw member 200 or the support wall 16a, a recessed part 16b is formed at the end side as seen in the circumferential direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a detachment prevention device having a storage recess formed to open in the inner circumferential direction on the receiving side with respect to the insertion tube, and a claw member tiltably stored in the storage recess, and to the claw member thereof.

Background Art

[0002] A conventional detachment prevention device is a split member, which is formed in an arc shape along the circumferential direction of the insertion portion of the insertion tube, and has a locking portion that locks with the outer peripheral surface of the insertion portion, and an opening facing the outer peripheral surface of the insertion portion and storing the locking portion inside. By the locking portion being pressed against the inner bottom surface of the storage recess, it bites into the outer peripheral surface of the insertion portion to prevent relative movement of the two-port tube.

[0003] In this type of detachment prevention device, there is one in which a locking portion (claw member) having a claw that locks with the outer peripheral surface of the insertion portion tilts by contacting the inner wall of the storage recess, and the claw bites into the outer peripheral surface of the insertion portion to prevent movement in both directions in the axial direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the detachment prevention device described in Patent Document 1, when the insertion pipe attempts to pull out relative to the receiving side, a claw member that engages with the outer peripheral surface of the insertion pipe tilts within a storage recess formed on the receiving side. However, when one side wall of the claw member hits the support wall of the storage recess, further tilting is blocked, and the claw of the claw member bites strongly into the insertion pipe to prevent the insertion pipe from pulling out. However, since the claw member is formed in an arc shape along the circumferential direction of the insertion pipe in order to bite into the outer peripheral portion of the insertion pipe, when the claw member tilts along with the movement of the insertion pipe, the first parts to hit the support wall of the storage recess are both ends in the circumferential direction of the side wall of the claw member. Stress concentrates at both ends in the circumferential direction of the side wall of the claw member, and stress also concentrates on the portions corresponding to both ends in the circumferential direction of the support wall of the opposing storage recess. Therefore, there is a risk that the claw member or the storage recess will be damaged.

[0006] The present invention has been made by paying attention to such problems, and an object thereof is to provide a detachment prevention device that reliably prevents the insertion pipe from pulling out relative to the receiving side without damaging the claw member or the storage recess, and the claw member thereof.

Means for Solving the Problems

[0007] In order to solve the above problems, the detachment prevention device of the present invention is a detachment prevention device having a storage recess formed on the receiving side with an opening facing the inner circumferential direction with respect to the insertion pipe, and a claw member movably stored in the storage recess, a support wall that supports and tilts one side wall of the claw member is provided to extend in the circumferential direction within the storage recess, and the side wall of the claw member or the support wall is characterized in that a recess is formed on the end side in the circumferential direction. According to this feature, when the claw member in the storage recess tilts with respect to the support wall from the start of tilting to the end of tilting due to the movement of the insertion pipe, the side wall of the claw member and the support wall of the storage recess avoid contact at the end side as much as possible by the recess, and are supported longer on the central side in the circumferential direction, thereby preventing damage due to stress concentration at both ends of the side wall of the claw member and the support wall of the storage recess.

[0008] The recess is characterized in that it is formed deeper toward the circumferential end. According to this feature, the contact at both ends between the side wall of the claw member and the support wall of the storage recess can be delayed, so that breakage due to stress concentration at both circumferential ends between the side wall of the claw member and the support wall of the storage recess can be prevented.

[0009] The recess is characterized in that it is formed in a tapered shape. According to this feature, since the recess is formed by a tapered surface, the manufacturing is easy.

[0010] The recess is characterized in that it is formed on both circumferential end sides. According to this feature, at least if the recesses are formed on both circumferential end sides, the both circumferential ends of the side wall of the claw member and the support wall of the storage recess will not come into contact first, so that breakage due to stress concentration at both circumferential ends between the side wall of the claw member and the support wall of the storage recess can be prevented.

[0011] The recess is characterized in that it is formed on the inner diameter side of the side wall of the claw member or on the inner diameter side of the support wall. According to this feature, the recess functions only when the claw member tilts.

[0012] A claw member tiltably accommodated in a storage recess formed with an opening facing the inner circumferential direction on the receiving port side with respect to the insertion port tube, It is characterized in that at least one side wall of the claw member is characterized in that a recess is formed on the end side in the circumferential direction. According to this feature, when the claw member in the storage recess tilts from the start of tilting to the end of tilting with respect to the support wall due to the movement of the insertion port tube, the side wall of the claw member and the support wall of the storage recess avoid contact at the end side by the recess as much as possible and are supported longer on the central side in the circumferential direction, so that breakage due to stress concentration at both ends between the side wall of the claw member and the support wall of the storage recess can be prevented.

[0013] The recess is characterized in that it is formed on the back side of the locking claw formed on the claw member. According to this feature, a recess is formed on the side surface opposite to the locking claw, which makes it easier to tilt the claw member and enables the locking claw to deeply bite into the insertion pipe.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Mode for Carrying Out the Invention

[0015] The mode for carrying out the anti-disengagement device and its claw member according to the present invention will be described below based on examples.

Example

[0016] The anti-disengagement device according to Example 1 will be described with reference to FIGS. 1 to 9. As shown in FIGS. 1 and 2(a), the fluid pipe in the present invention is a water supply pipe buried in the ground, and a connection portion is formed in which the receiving portion 5 of the water pipe 2 (bent pipe) as a receiving pipe and the insertion portion 12 formed at the end of the water pipe 11 (straight pipe) as an insertion pipe are watertightly connected. In addition, a gas pipe 4 is installed adjacent to the fluid pipe.

[0017] In the fluid pipe of this embodiment, the city water flows down inside the pipe in the direction of the white arrow in FIG. 1. Further, the water pipe 2 has a bent portion 3 that bends at a predetermined angle along the pipe axis C. In such a bent portion 3 or straight portion, an uneven force due to the water pressure or water flow of the internal fluid of the fluid pipe, or an unpredictable external force such as an earthquake acts, for example, the connection between the receiving portion 5 and the insertion portion 12 comes off and the internal fluid leaks, or the fluid pipe moves and may come into contact with, for example, an adjacent gas pipe 4 or the like.

[0018] As shown in FIGS. 1 to 2, the water pipes 2 and 11 are, for example, made of ductile cast iron for water supply pipes buried in the ground, and the inner peripheral surface of the pipe is covered with a mortar layer. In the upper half of FIG. 2(b), a cross-section of a portion extending obliquely from the central axis with respect to the diameter direction of the detachment preventing tool 15 shown in FIG. 2(a) is illustrated.

[0019] Further, the fluid pipe according to the present invention may be made of metal such as cast iron other than ductile iron, steel, etc., or may be made of concrete, vinyl chloride, polyethylene, polyolefin, etc. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be covered with, for example, an epoxy resin layer, plating, etc., or the inner peripheral surface of the fluid pipe may be covered with an appropriate material by powder coating.

[0020] In this embodiment, the fluid in the fluid pipe is not limited to the city water of this embodiment, and may be, for example, industrial water, agricultural water, sewage, etc., or other liquids other than water, or may be a gas or a gas-liquid mixture of gas and liquid. The installation mode of the fluid pipe shown in FIG. 1 is only an example, and the detachment preventing device of the present invention can be applied to various installation modes of fluid pipes.

[0021] As shown in FIG. 2(a), the water pipe 2 as a receiving pipe has a receiving portion 5 having a receiving shape and a flange 5a provided at an end of the receiving portion 5. The water pipe 11 as an insertion pipe has an insertion portion 12 inserted into the receiving portion 5.

[0022] In addition, the water pipe 2 as the receiving pipe and the water pipe 11 as the insertion pipe are inserted via an annular sealing material (not shown) arranged over the entire circumference between the inner peripheral surface of the receiving portion 5 and the outer peripheral surface of the insertion portion 12. Further, an annular pressing ring 22 formed by connecting arc-shaped members that are integral or divided into a plurality is externally fitted and installed on the outer peripheral surface of the insertion portion 12. This pressing ring 22 has a pressing portion 22a that protrudes toward the flange 5a side.

[0023] The pressing ring 22 is connected by fastening a plurality of T-head bolts and nuts 23 to the flange 5a. By approaching the pressing ring 22 and the flange 5a with this fastening, a sealing material (not shown) pressed by the pressing portion 22a adheres to the inner peripheral surface of the receiving portion 5 and the outer peripheral surface of the insertion portion 12, and the water pipe 2 as the receiving pipe and the water pipe 11 as the insertion pipe are connected in a sealed state.

[0024] Also, as shown in Fig. 2(a), the pressing ring 22 is fixed to the water pipe 11 by screwing in a bolt 24 inserted in the radial direction, and a claw member (not shown) arranged on the inner peripheral portion thereof biting into the outer peripheral surface of the water pipe 11. These claw members (not shown) of the pressing ring 22 and the bolt 24 are equally arranged in the circumferential direction eight times, and an arm portion 15b of a detachment prevention tool 15 described later is arranged on the outer diameter side thereof.

[0025] As shown in Figs. 1 to 2, the detachment prevention tool 15, for example as in this embodiment, prevents the water pipe 2 as the receiving pipe and the water pipe 11 as the insertion pipe, which are connected in a sealed state via the pressing ring 22, from coming out in the pipe axis direction. It is formed in an annular shape by arranging a plurality of divided bodies made of ductile cast iron in the circumferential direction and connecting them with bolts and nuts 9a, 9b.

[0026] More specifically, the detachment prevention device 15 is composed of a base portion 15a fixed to the water pipe 11 as an insertion port pipe, and an arm portion 15b extending axially so as to straddle the pressing wheel 22 and the flange 5a of the receiving portion 5 from the base portion 15a. Further, in this embodiment, the base portion 15a is formed in an annular shape by arranging two split bodies vertically in the circumferential direction and connecting them with bolt nuts 9a, and similarly, the arm portion 15b is formed in an annular shape by arranging two split bodies vertically in the circumferential direction and connecting them with bolt nuts 9b. Furthermore, these base portion 15a and arm portion 15b are connected by T-head bolt nuts 17. It should be noted that although the base portion 15a and the arm portion 15b of the detachment prevention device 15 in this embodiment are each composed of two split bodies, they may be formed in an annular shape by three split bodies or four or more split bodies. Also, the base portion 15a and the arm portion 15b of the detachment prevention device 15 are not limited to being separate in the axial direction as in this embodiment, and may be integrally formed. Further, the end portion of the arm portion 15b of the detachment prevention device 15 in the pipe axis direction is formed into a hook portion having an inner diameter smaller than the flange 5a of the receiving portion 5, and by coming into contact with the flange 5a along the circumferential direction, movement in one direction (the left direction in the drawing) of the pipe axis C is prevented.

[0027] As shown in FIG. 2, a plurality of storage recesses 16 as claw chambers for inserting and fixing the claw members 200 are arranged at predetermined intervals in the circumferential direction on the inner peripheral portion of the base portion 15a. Further, bolts 7 are screwed in the radial direction so as to communicate with each storage recess 16 in the base portion 15a, and by screwing the bolts 7 from the outer diameter side, the claw members 200 described later stored in each storage recess 16 can be pressed in the inner diameter direction.

[0028] As shown in FIG. 2(b), the storage recess 16 is partitioned by partition walls 15c provided at predetermined intervals in the circumferential direction, and thus eight locations are formed in the circumferential direction in this embodiment. Each storage recess 16 communicates with a bolt hole 6 for screwing the bolt 7. Further, in each storage recess 16, the claw member 200 is fitted in a state of being connected via the partition wall 15c and the rubber body 18. It should be noted that the number of the storage recesses and the claw members is not limited to this embodiment, and they may be provided along the circumferential direction of the fluid pipe.

[0029] Further, each claw member 200 has substantially the same shape and a plurality of them are arranged over the circumferential direction of the insertion port portion 12. As shown in FIG. 2(b), they are substantially symmetric in the circumferential direction, and the substantially central position in the circumferential direction of the claw member 200 is pressed in the inner diameter direction by the bolt 7.

[0030] Also, as shown in FIGS. 6(a) to 6(e), the claw member 200 is pressed toward the outer peripheral surface of the insertion port portion 12 by screwing in the bolt 7, so that the locking claw 200a bites into and locks to the outer peripheral surface of the insertion port portion 12, preventing the water pipe 11 from moving in the direction of the pipe axis C as described later. Further, gaps K and K' are formed on both the left and right sides in the direction of the pipe axis C of the storage recess 16 in which the claw member 200 is stored.

[0031] Furthermore, as shown in FIG. 4, on the outer diameter side of the inner surface on the removal side of the insertion port portion 12 in the storage recess 16, a support wall 16a is formed in the radial direction, that is, in a direction substantially orthogonal to the outer peripheral surface of the insertion port portion 12. On the inner diameter side of this support wall 16a, a tapered surface 16b is formed as a recess that inclines in a direction of expanding in a tapered shape toward the opening on the insertion port portion 12 side.

[0032] Next, the claw member 200 in the first embodiment, which is stored in the storage recess 16 of the present invention, will be described. As shown in FIG. 3, the claw member 200 is a conventional type claw member, substantially arc-shaped in a front view, and the side wall 200c that contacts the support wall 16a of the storage recess 16 is a uniform flat surface including the central portion in the circumferential direction and both end portions in the circumferential direction. It has a locking claw 200a that extends from the side wall 200d on the insertion direction side in the inner diameter direction and locks to the outer peripheral surface of the insertion port portion 12. Also, as will be described later, the locking claw 200a tilts in the storage recess 16 and bites into the outer peripheral surface of the insertion port portion 12, so that the detachment prevention tool 15 is fixed to the insertion port portion 12.

[0033] As shown in FIG. 4, the tapered surface 16b formed as a recess formed at both circumferential ends of the storage recess 16 is an inclined surface inclined at a uniform angle with respect to the support wall 16a. As shown in FIG. 4(a), the boundary line 16c between the support wall 16a and the tapered surface 16b is formed in a substantially straight line shape, so that the tapered surface 16b is formed in a tapered shape that gradually becomes deeper toward the end than the central side in the circumferential direction. In the embodiment shown in FIG. 4(a), the tapered surface 16b is continuously provided from one end to the other end. However, like the storage recess 16' of the modified example shown in FIG. 5, the tapered surfaces 16b' that are separated from each other may be provided only in regions near both circumferential ends.

[0034] Next, the operation of the claw member 200 when an external force acts on the water pipes 2 and 11 will be sequentially described with reference to FIG. 6 showing the central side in the circumferential direction of the storage recess 16 and the claw member 200. FIG. 6 is a cross-sectional view taken along line B-B of FIG. 2(b) of the storage recess of the present invention and a conventional claw member. First, FIG. 6(a) shows a state before the claw member 200 is pushed in by screwing the bolt 7. As shown in FIG. 6(b), the claw member 200 is pressed toward the outer peripheral surface of the insertion portion 12 by screwing the bolt 7, so that the locking claw 200a bites into and locks to the outer peripheral surface of the insertion portion 12 under normal conditions. At this position, when an unexpected external force such as an earthquake or an uneven force such as the water pressure in the water pipe 11 occurs, as shown in FIG. 6(c), the insertion portion 12 of the water pipe 11 moves in one direction of the pipe axis C (the direction of the white arrow shown in the figure), and the claw member 200 locked to the outer peripheral surface of the insertion portion 12 moves by a gap K in one direction of the pipe axis C (the direction of the white arrow shown in the figure) while maintaining contact of its upper part shown in the figure with the tip of the bolt 7. By this movement, the above-described gap K is filled, and a gap K” is formed on the right side of the claw member 200 shown in the figure.

[0035] Furthermore, the anti-disengagement device 15 moves a predetermined length in one direction (the left direction in the figure) of the pipe axis C, and the hook portion of the arm portion 15b of the anti-disengagement device 15 abuts against the flange 5a of the receiving portion 5. Next, as shown in FIG. 6(d), the claw member 200 that has moved a gap K in one direction of the pipe axis C maintains contact between the upper portion thereof shown in the figure and the tip of the bolt 7, abuts against the support wall 16a of the storage recess 16, and further presses the anti-disengagement device 15 in one direction of the pipe axis C.

[0036] Then, as shown in FIGS. 6(d) and (e), the upper portion of the claw member 200 shown in the figure maintains contact with the tip of the bolt 7, and the locking claw 200a of the claw member 200 tilts with respect to the outer peripheral surface of the water pipe 11. In this way, the locking claw 200a of the claw member 200 locks to the insertion portion 12, and by using the storage recess 16 in which the claw member 200 is stored as a reaction force, the locking claw 200a bites into the outer peripheral surface of the insertion portion 12, so that the water pipe 11 moves relative to the anti-disengagement device 15 in the left direction shown in the figure of the pipe axis C. That is, it is possible to prevent the water pipe 11 from coming out.

[0037] In particular, as shown in FIG. 6(e), when the claw member 200 tilts within the storage recess 16, a reaction force is obtained by using the support wall 16a of the storage recess 16 and the tip of the bolt 7, and the locking claw 200a easily bites into the outer peripheral surface of the insertion portion 12, so that the movement of the water pipe 11 can be reliably prevented. In addition, the claw member 200 easily tilts by using the gap K having a predetermined length, the locking claw 200a easily bites into the outer peripheral surface of the insertion portion 12, and the movement prevention effect of the water pipe 11 is further enhanced.

[0038] Next, the operation of the above-described claw member 200 will be sequentially described with reference to FIG. 7 showing the storage recess 16 and the circumferential end side of the claw member 200. FIG. 7 is a G-G cross-sectional view of the storage recess of the present invention and the conventional claw member corresponding to FIG. 2(b). FIG. 7(a) shows a state before the claw member 200 is pushed in by screwing the bolt 7, similar to FIG. 6(a). The difference from FIG. 6(a) is that the tapered surface 16b located on the inner diameter side of the support wall 16a of the storage recess 16 is formed in a gradually widening area in the radial direction as it approaches both circumferential ends from the circumferential center side. As shown in FIG. 7(b), the claw member 200 is pressed toward the outer peripheral surface of the insertion portion 12 by screwing the bolt 7. As shown in FIG. 7(c), as the water pipe 11 moves, the claw member 200 that was locked to the outer peripheral surface of the insertion portion 12 moves by the gap K while maintaining contact with the tip of the bolt 7.

[0039] Then, as shown in FIGS. 7(d) and 7(e), the claw member 200 tilts within the storage recess 16. Here, if the support wall 16a of the storage recess 16 is configured as a uniform flat surface as in the prior art, since the claw member 200 is formed in an arc shape along the circumferential direction of the insertion port 12, when the claw member 200 tilts following the movement of the insertion port 12, the first portions to contact the support wall 16a of the storage recess 16 are both ends in the circumferential direction of the side wall 200c on the removal direction side of the claw member 200, and at this time, the central portion in the circumferential direction separates without contacting the support wall 16a (see FIG. 9(d)). Therefore, stress due to contact with the support wall 16a concentrates at both ends in the circumferential direction of the side wall of the claw member 200, and stress also concentrates at the contact portions at both ends in the circumferential direction of the support wall 16a of the opposing storage recess 16, and there is a risk that the claw member 200 or the storage recess 16 may be damaged. In contrast, the support wall 16a of the storage recess 16 of the present invention is not a uniform flat surface, but forms tapered surfaces 16b as recesses at least at both ends in the circumferential direction. Thus, in the tilting start state where the claw member 200 starts to tilt as shown in FIG. 7(d), both ends in the circumferential direction of the side wall 200c on the removal direction side of the claw member 200 do not contact the support wall 16a of the storage recess 16. As shown in FIG. 7(e), in the tilting end state where the claw member 200 has finished tilting, the side wall 200c on the removal direction side of the claw member 200 contacts substantially the entire surface of the tapered surface 16b of the storage recess 16 over the entire central portion and both ends in the circumferential direction (see FIG. 8(d)). By forming the tapered surface 16b in this way, at least in the tilting start state of the claw member 200, contact is not made at both ends in the circumferential direction between the side wall 200c on the removal direction side of the claw member 200 and the support wall 16a of the storage recess 16, that is, the timing of contact between the side wall 200c and the support wall 16a of the storage recess 16 can be delayed, so that damage due to local stress concentration at both ends in the circumferential direction between the side wall 200c of the claw member 200 and the support wall 16a of the storage recess 16 can be prevented.

[0040] Also, as described above, if at least the tapered surfaces 16b or, as a modified example, the tapered surfaces 16b' (see FIG. 5) are formed on both end portions in the circumferential direction, the both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 and the support wall 16a of the storage recess 16 do not come into contact first. Therefore, it is possible to prevent breakage due to local stress concentration at both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 and the support wall 16a of the storage recess 16.

[0041] Further, as shown in FIG. 4(a), since the boundary line 16c between the support wall 16a and the tapered surface 16b is formed in a substantially straight line shape, not only can the claw member 200 be tilted about this boundary line 16c, but also in the state where the tilting of the claw member 200 is completed, the side wall 200c in the extraction direction of the claw member and the tapered surface 16b of the storage recess 16 can be brought into contact with each other over a wide surface along the circumferential direction.

[0042] Note that depending on the tilting situation, it is not limited to the case where the entire surface including the central portion and both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 abuts against the entire surface of the support wall 16a of the storage recess 16. There may be cases where a partial region on the central portion side in the circumferential direction or a partial region on the both end portions side abuts. In this way, when the claw member 200 in the storage recess 16 tilts with respect to the support wall 16a from the start of tilting to the end of tilting due to the movement of the insertion port portion 12, the side wall 200c on the extraction direction side of the claw member 200 and the support wall 16a of the storage recess 16 avoid local contact at the end portion side by the recess as much as possible, and are supported over a wider region including the central side in the circumferential direction for a long time from the start of tilting to the end of tilting, thereby preventing breakage due to local stress concentration at both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 and the support wall 16a of the storage recess 16.

[0043] Further, since the tapered surface 16b is formed on the inner diameter side of the support wall 16a, the tapered surface 16b functions as a support surface only when the claw member 200 tilts. Also, since both end portions in the circumferential direction of the support wall 16a of the storage recess 16 are formed by tapered surfaces (tapered surfaces 16b), the manufacturing is easy.

[0044] Next, the movement of the claw member according to the present invention will be described in comparison with the movement of the conventional claw member. First, the movement of the conventional claw member will be described. As shown in FIG. 9, the conventional claw member 200 is housed inside the conventional storage recess 160 in which only the support wall 160a is formed. FIG. 9(a) shows that as the water pipe 11 moves, the claw member 200 that was engaged with the outer peripheral surface of the insertion port 12 maintains contact with the tip of the bolt 7 and moves by the gap K, and the uniform side wall 200c on the removal direction side of the claw member 200 is in contact with the uniform support wall 160a of the storage recess 160, and the claw member 200 shows the state before tilting. FIG. 9(b) shows a state in which the claw member 200 maintains contact with the support wall 160a of the storage recess 160 and tries to follow the movement of the water pipe 11, so that the locking claw 200a of the claw member 200 tilts so as to bite into the outer peripheral surface of the water pipe 11. At this time, as shown in FIG. 9(b), only both circumferential ends of the side wall 200c on the removal direction side of the claw member 200 are in contact with the support wall 160a of the storage recess 160, and the central portion in the circumferential direction of the side wall 200c on the removal direction side of the claw member 200 is not in contact with the support wall 160a of the storage recess 160. Therefore, stress is concentrated at both circumferential ends of the side wall of the claw member 200, and stress is also concentrated at the corresponding portions of both circumferential ends of the opposing support wall 160a of the storage recess 160. FIGS. 9(c) to (d) show a state in which the claw member 200 further tilts while maintaining the state in which only both circumferential ends of the side wall 200c on the removal direction side of the claw member 200 are in contact with the support wall 160a of the storage recess 160. Further stress is concentrated at both circumferential ends of the side wall of the claw member 200, and stress is also further concentrated at the corresponding portions of both circumferential ends of the opposing support wall 160a of the storage recess 160, and there is a risk that the claw member 200 or the storage recess 160 may be damaged.

[0045] In contrast, the movement of the claw member of the present invention will be described. As shown in FIG. 8, the claw member 200 is housed inside the storage recess 16 in which the support wall 16a and the tapered surface 16b of the present invention are formed. FIG. 8(a) corresponds to FIGS. 6(c) and 7(c) described above. As the water pipe 11 moves, the claw member 200 that was engaged with the outer peripheral surface of the insertion portion 12 maintains contact with the tip of the bolt 7 and moves by the amount of the gap K. The central portion in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 is in contact with the central portion in the circumferential direction of the support wall 16a of the storage recess 16, and the claw member 200 shows the state before tilting. FIG. 8(b) corresponds to FIGS. 6(d) and 7(d) described above. While maintaining the state where the central portion in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 is in contact with the central portion in the circumferential direction of the support wall 16a of the storage recess 16 and trying to follow the movement of the water pipe 11, the locking claw 200a of the claw member 200 is shown in a state of tilting so as to bite into the outer peripheral surface of the water pipe 11. At this time, as shown in FIG. 8(b), both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 only enter the tapered surfaces 16b formed at both end portions in the circumferential direction of the support wall 16a of the storage recess 16 and do not contact the support wall 16a of the storage recess 16. Therefore, stress concentration does not occur at both end portions in the circumferential direction of the side wall of the claw member 200 or at corresponding portions of both end portions in the circumferential direction of the opposing support wall 16a of the storage recess 16. FIGS. 8(c) to (d) correspond to FIGS. 6(e) and 7(e) described above, and show a state in which the central portion in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 maintains contact with the central portion in the circumferential direction of the support wall 16a of the storage recess 16 and the claw member 200 is further tilted in sequence. Also in this case, since both end portions in the circumferential direction of the side wall 200c on the extraction direction side of the claw member 200 enter the tapered surfaces 16b formed at both end portions in the circumferential direction of the support wall 16a of the storage recess 16, stress concentration does not occur at both end portions in the circumferential direction of the side wall of the claw member 200 or at corresponding portions of both end portions in the circumferential direction of the opposing support wall 16a of the storage recess 16.

Embodiment

[0046] Next, the detachment prevention device according to Embodiment 2 and its claw member will be described with reference to FIGS. 10 to 12. In Embodiment 1, the case where the tapered surfaces 16b are formed at both circumferential ends of the support wall 16a of the storage recess 16 has been described. However, as shown in FIG. 10, the same effect can be obtained by forming the tapered surfaces 20e at both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20. That is, since the tapered surfaces 20e are formed at both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20, both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 do not contact the support wall 160a of the conventional storage recess 160. In the tilting end state where the claw member 20 has finished tilting, the tapered surfaces 20e formed at both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 contact substantially the entire surface of the support wall 160a of the storage recess 160 over the entire circumferential central portion and both end portions. Note that depending on the tilting situation, it is not limited to the case where the entire surface including the circumferential central portion and both circumferential end portions of the side wall 20c on the extraction direction side of the claw member 20 contacts the entire surface of the support wall 160a of the storage recess 160, and a partial region on the circumferential central portion side or a partial region on the both end portions side may contact.

[0047] As shown in Fig. 10(a), the tapered surface 20e of the claw member 20 of the present invention is formed to be gradually deeper toward the circumferential end. By forming it in this way, the timing of contact between the circumferential ends of the side wall 20c on the removal direction side of the claw member 20 and the support wall 160a of the storage recess 160 can be delayed, so that damage due to local stress concentration at both circumferential ends of the side wall of the claw member and the support wall of the storage recess can be prevented. In the embodiment shown in Fig. 10(a), the tapered surface 20e is provided continuously from one end to the other end. However, like the claw member 20' of the modified example shown in Fig. 11, the tapered surfaces 20e' that are separated from each other may be provided only in regions near both circumferential ends. In this way, as long as the tapered surface 20e is formed at least on both circumferential end sides, the circumferential ends of the side wall 20c on the removal direction side of the claw member 20 and the support wall 160a of the storage recess 160 do not come into contact first, so that damage due to local stress concentration at both circumferential ends of the side wall 20c on the removal direction side of the claw member 20 and the support wall 160a of the storage recess 160 can be prevented.

[0048] As shown in Figs. 10(b), (d) and (e), the claw member 20 is arc-shaped in a front view. The side wall 20c on the removal direction side of the claw member 20 has a tapered surface 20e formed on the opposite side of the locking claw 20a, which is tapered and gradually deeper toward the circumferential end on the inner diameter side of the side wall 20c. Further, as shown in Fig. 10(c), the claw member 20 is rectangular in a bottom view. The side wall 20c on the removal direction side of the claw member 20 has a tapered surface 20e formed on the opposite side of the locking claw 20a, which is tapered and gradually deeper toward the circumferential end. In this way, since the tapered surface 20e is formed on the inner diameter side of the side wall 20c, the tapered surface 20e functions only when the claw member 20 tilts. Further, since both circumferential ends of the claw member 20 are formed by tapered surfaces (tapered surface 20e), the manufacturing is easy. Further, since the tapered surface 20e is formed on the side wall 20c on the side opposite to the locking claw 20a, it becomes easier to tilt the claw member 20, and the locking claw 20a can bite deeply into the insertion portion 12.

[0049] The operation of the claw member 20, specifically the movement of the storage recess and the end side in the circumferential direction of the claw member, will be described with reference to FIG. 12. Note that the movement of the storage recess and the central side in the circumferential direction of the claw member is substantially the same as that in FIG. 6, so the description thereof will be omitted. FIG. 12(a) shows the state before the claw member 20 is pushed in by screwing in the bolt 7. The difference from FIG. 6(a) is that tapered surfaces 20e are formed at both ends in the circumferential direction of the side wall 20c on the side where the claw member 20 exits. As shown in FIG. 12(b), the claw member 20 is pressed toward the outer peripheral surface of the insertion portion 12 by screwing in the bolt 7. As shown in FIG. 12(c), as the water pipe 11 moves, the claw member 20 that was locked to the outer peripheral surface of the insertion portion 12 moves by the amount of the gap K while maintaining contact with the tip of the bolt 7.

[0050] Then, as shown in FIGS. 12(d) to (e), the claw member 20 tilts. In the claw member 20 of the present invention, since the side wall 20c on the extraction direction side of the claw member 20 is not a uniform flat surface as in the prior art, but tapered surfaces 20e are formed at both circumferential ends, in the tilting start state where the claw member 20 starts to tilt as shown in FIG. 12(d), both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 do not contact the support wall 160a of the storage recess 160. As shown in FIG. 12(e), in the tilting end state where the claw member 20 has finished tilting, the tapered surfaces 20e formed at both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 contact substantially the entire surface of the support wall 160a of the storage recess 160 over the entire surface of the central portion and both ends in the circumferential direction. Note that depending on the tilting situation, it is not limited to the case where the entire surface including the central portion and both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 contacts the entire surface of the support wall 160a of the storage recess 160, and a partial region on the central portion side in the circumferential direction or a partial region on the both ends side may contact. In this way, due to the movement of the insertion port portion 12, the claw member 20 in the storage recess 160 tilts with respect to the support wall 160a from the start of tilting to the end of tilting. The side wall 20c on the extraction direction side of the claw member 20 and the support wall 160a of the storage recess 160 avoid local contact at the end side by the recess as much as possible, and are supported for a long time from the start of tilting to the end of tilting in a wider region including the central side in the circumferential direction, thereby preventing damage due to local stress concentration at both circumferential ends of the side wall 20c on the extraction direction side of the claw member 20 and the support wall 160a of the storage recess 160.

[0051] In the above embodiment, the claw member 20 has a locking claw 20a that extends orthogonally from the side wall 20d on the insertion direction side toward the tube axis C and locks with the outer peripheral surface of the insertion port portion 12. However, as the claw member of Modification 1, as shown in FIG. 13, the claw member 120 has a first locking claw 120a that extends toward the insertion direction side and locks with the outer peripheral surface of the insertion port portion 12, and a second locking claw 120b that extends toward the extraction direction side and locks with the outer peripheral surface of the insertion port portion 12. In this Modification 1, it functions not only as a detachment prevention device but also as a movement prevention device in the insertion direction. Further, the first locking claw 120a and the second locking claw 120b are substantially symmetric with respect to the plane D orthogonal to the tube axis C, and the claw member 120 is housed in the housing recess 116 so that the first locking claw 120a or the second locking claw 120b tilts and bites into the outer peripheral surface of the insertion port portion 12. Also, in the above embodiment, the bolt 7 is configured to press the claw member 20 in the radial direction. However, in this Modification 1, when the ends of the split bodies of the detachment prevention tool 15 are assembled by a bolt and nut (not shown), the claw member 120 is pressed in the inner diameter direction by using the pressing force pressed by the bottom surface of the housing recess 116.

[0052] Further, on the inner surface of the housing recess 116, separate from the tapered surface 116b corresponding to the tapered surface 16b of Embodiment 1, expanding tapered surfaces 116c and 116d that expand toward the opening are formed. By doing so, the claw member 120 becomes easier to tilt by using the expanding tapered surfaces 116c and 116d that expand toward the opening.

[0053] Moreover, the above-described expanding tapered surfaces 116c and 116d are not necessarily formed only on the inner surface of the storage recess 116. For example, a bulging portion that bulges in the pipe axis C direction may be provided on the inner surface of the storage recess 116. By doing so, when the claw member 120 attempts to move in the pipe axis C direction together with the water pipe 11 and comes into contact with the bulging portion, the first locking claw 120a or the second locking claw 120b can easily tilt with the bulging portion as a fulcrum, bite into the outer peripheral surface of the insertion portion 12, and lock the water pipe 11. Furthermore, the above-described expanding tapered surfaces 116c and 116d may be formed on the inner surface, and a bulging portion may be provided. By doing so, the locking claw 120a becomes more likely to tilt.

[0054] Although not particularly shown, when the water pipe 11 moves in the other direction (right direction in the figure) of the pipe axis C, which is opposite to the one direction (left direction in the figure) of the above-described pipe axis C, the claw member 120 operates in the same manner as described above. When the second locking claw 120b tilts, it bites into the outer peripheral surface of the insertion portion 12 and locks the water pipe 11.

[0055] In addition, since the first locking claw 120a and the second locking claw 120b are substantially symmetric in the pipe axis C direction about the plane D perpendicular to the pipe axis C, the anti-separation function and the anti-movement function of approximately the same degree can be exerted in both directions along the pipe axis C.

[0056] Next, the operation of the anti - detachment function of the claw member 120 will be described. FIG. 13(a) is a cross - sectional view of the circumferential end of the storage recess 116 and the claw member 120, showing the state before the claw member 120 is pushed in. Tapered surfaces 116b corresponding to the tapered surface 16b of Example 1 are formed at the circumferential ends of the support wall (expanding tapered surface 116c) on the removal direction side of the storage recess and the expanding tapered surface 116d on the insertion direction side, respectively. As shown in FIG. 13(b), when the claw member 120 is pressed toward the outer peripheral surface of the insertion port portion 12, the first locking claw 120a and the second locking claw 120b bite into and lock to the outer peripheral surface of the insertion port portion 12. Then, as shown in FIG. 13(c), at this position, when an unexpected external force such as an earthquake or an uneven force such as the water pressure in the water pipe 11 occurs, the insertion port portion 12 of the water pipe 11 moves toward the removal direction side of the pipe axis C, and the claw member 120 that was locked to the outer peripheral surface of the insertion port portion 12 maintains contact with the upper end surface 116e of the inner wall of the storage recess 116 and moves by a gap K toward the removal direction side of the pipe axis C. Due to this movement, the above - mentioned gap K is filled, and a gap K” is formed on the right side of the claw member 120 in the drawing.

[0057] Furthermore, the anti - detachment tool 15 moves a predetermined length toward the removal direction side of the pipe axis C, and the hook portion of the arm portion 15b of the anti - detachment tool 15 abuts against the flange 5a of the receiving portion 5. Next, as shown in FIG. 13(d), the claw member 120 that has moved by the gap K toward the removal direction side of the pipe axis C maintains contact with the upper end surface 116e of the inner wall of the storage recess 116, abuts against the support wall (expanding tapered surface 116c) of the storage recess 116, and further presses the anti - detachment tool 15 toward the removal direction side of the pipe axis C.

[0058] Then, as shown in FIG. 13(d), the claw member 120 maintains contact with the upper end surface 116e of the inner wall of the storage recess 116, and the first locking claw 120a of the claw member 120 tilts toward the outer peripheral surface of the water pipe 11. In this way, the first locking claw 120a of the claw member 120 is locked to the insertion port portion 12, and by using the storage recess 116 in which the claw member 120 is stored as a reaction force, the first locking claw 120a bites into the outer peripheral surface of the insertion port portion 12, thereby preventing the water pipe 11 from moving toward the removal direction side of the pipe axis C with respect to the anti - detachment tool 15.

[0059] Then, similar to the first embodiment, in the storage recess 116, the support wall (expanding tapered surface 116c) on the side of the extraction direction of the storage recess 116 is not a uniform flat surface, and tapered surfaces 116b are formed at both circumferential ends. Therefore, in the tilting start state where the claw member 120 starts to tilt as shown in Fig. 13(d), both circumferential ends of the side wall 120c on the extraction direction side of the claw member 120 do not contact the support wall (expanding tapered surface 116c) of the storage recess 116. In the tilting end state where the claw member 120 has finished tilting, the side wall 120c on the extraction direction side of the claw member 120 contacts substantially the entire surface of the tapered surface 116b of the storage recess 116 across the entire surface of the central part and both ends in the circumferential direction. Note that depending on the tilting situation, it is not limited to the case where the entire surface including the central part and both circumferential ends of the side wall 120c on the extraction direction side of the claw member 120 contacts the entire surface of the support wall (expanding tapered surface 116c) of the storage recess 116, and a partial region on the central part side in the circumferential direction or a partial region on the both ends side may contact. In this way, due to the movement of the insertion part 12, from the start of tilting to the end of tilting of the claw member 120 in the storage recess 116 with respect to the support wall (expanding tapered surface 116c), the side wall 120c on the extraction direction side of the claw member 120 and the support wall (expanding tapered surface 116c) of the storage recess 116 avoid local contact at the end side by the recess as much as possible, and are supported for a long time from the start of tilting to the end of tilting in a wider region including the central side in the circumferential direction, so that damage due to local stress concentration at both circumferential ends of the side wall 120c on the extraction direction side of the claw member 120 and the support wall (expanding tapered surface 116c) of the storage recess 116 can be prevented.

[0060] Also, similar to the second embodiment, the same effect can be obtained by forming tapered surfaces (not shown) at both circumferential ends of the side wall 120c on the extraction direction side of the claw member 120.

[0061] Furthermore, in Modification 1, as described above, in addition to the first locking claw 120a, it has the second locking claw 120b, so it also has a function of preventing movement in the insertion direction. That is, as shown in FIG. 13, tapered surfaces (not shown) are formed at both circumferential ends of the support wall (expansion tapered surface 116d) of the storage recess 116, or tapered surfaces (not shown) are formed at both circumferential ends of the side wall 120d on the insertion direction side of the claw member 120. Thus, similar to the detachment prevention function, it is possible to obtain the effect of preventing damage due to local stress concentration at both circumferential ends between the side wall 120d on the insertion direction side of the claw member 120 and the support wall (tapered surface 116d) of the storage recess 116.

[0062] Also, as a claw member in Modification 2, as shown in FIG. 14, the claw member 220 has a first locking claw 220a that extends from the side wall 220d on the insertion direction side toward the tube axis C in the insertion direction and engages with the outer peripheral surface of the insertion port portion 12, and a second locking claw 220b that extends from the side wall 220c on the removal direction side toward the tube axis C in the insertion direction and engages with the outer peripheral surface of the insertion port portion 12 at the center of the bottom surface of the claw member 220. In this Modification 2, both the first locking claw 220a and the second locking claw 220b function as a detachment prevention device. Also, the claw member 220 is housed in the storage recess 216 such that the first locking claw 220a and the second locking claw 220b tilt and bite into the outer peripheral surface of the insertion port portion 12. Further, in the first embodiment, the bolt 7 is configured to press the claw member 200 in the radial direction, but in this Modification 2, the claw member 220 is pressed in the inner diameter direction by using the assembling force generated when the ends of the split bodies of the detachment prevention tool 15 are assembled by bolts 9a and 9b, so the bolt 7 is not shown. Also, the upper end surface 216e of the inner wall of the storage recess 216 is inclined toward the removal direction side, and the upper wall 220f of the claw member 220 is also inclined toward the removal direction side.

[0063] Regarding the operation of the claw member 220, FIG. 14(a) is a cross-sectional view of the storage recess 216 and the circumferential end of the claw member 220, showing the state before the claw member 220 is pushed in. At the circumferential ends of the support walls 216a on the removal direction side of the storage recess, tapered surfaces 216b corresponding to the tapered surfaces 16b of the first embodiment are formed respectively. As shown in FIG. 14(b), when the claw member 220 is pressed toward the outer peripheral surface of the insertion port 12, the first locking claw 220a and the second locking claw 220b bite into and are locked to the outer peripheral surface of the insertion port 12. Then, as shown in FIG. 14(c), at this position, when an unexpected external force such as an earthquake or an uneven force such as the water pressure in the water pipe 11 occurs, the insertion port 12 of the water pipe 11 moves toward the removal direction side of the pipe axis C, and the claw member 220 locked to the outer peripheral surface of the insertion port 12 maintains contact with the upper end surface 216e of the inner wall of the storage recess 216 and moves a distance K in the removal direction side of the pipe axis C. Since this claw member 220 moves along the upper end surface 216e of the inner wall of the storage recess 216 whose upper wall 220f is inclined toward the removal direction side, the claw member 220 is pushed in the direction perpendicular to the pipe axis C as it moves, and the locking claw 220a can bite deeper into the insertion port 12. Then, the above-mentioned gap K is filled, and a gap K” is formed on the right side of the claw member 220 in the drawing.

[0064] Furthermore, the anti-disengagement device 15 moves a predetermined length in the removal direction side of the pipe axis C, and the hook portion of the arm portion 15b of the anti-disengagement device 15 abuts against the flange 5a of the receiving portion 5. Next, as shown in FIG. 14(d), the claw member 220 that has moved a distance K in the removal direction side of the pipe axis C abuts against the support wall 216a of the storage recess 216 and further presses the anti-disengagement device 15 in the removal direction side of the pipe axis C.

[0065] Then, as shown in FIG. 14(d), the claw member 220 maintains contact with the support wall 216a of the storage recess 216, and the first locking claw 220a and the second locking claw 220b of the claw member 220 tilt toward the outer peripheral surface of the water pipe 11. In this way, the first locking claw 220a and the second locking claw 220b of the claw member 220 are locked to the insertion portion 12, and by using the storage recess 216 in which the claw member 220 is stored as a reaction force, the first locking claw 220a and the second locking claw 220b bite into the outer peripheral surface of the insertion portion 12, thereby preventing the water pipe 11 from moving in the direction of pulling out from the anti-disconnection device 15 with respect to the pipe axis C.

[0066] And, similar to the first embodiment, the storage recess 216 has a support wall 216a on the side of the storage recess 216 in the pulling-out direction, which is not a uniform flat surface, but has tapered surfaces 216b formed at both circumferential ends. Therefore, in the tilting start state where the claw member 220 starts to tilt as shown in FIG. 14(d), both circumferential ends of the side wall 220c on the pulling-out direction side of the claw member 220 do not contact the support wall 216a of the storage recess 216. In the tilting end state where the claw member 220 has finished tilting, the side wall 220c on the pulling-out direction side of the claw member 220 contacts substantially the entire surface of the tapered surface 216b of the storage recess 216 over the entire surface of the central portion and both ends in the circumferential direction. Note that depending on the tilting situation, it is not limited to the case where the entire surface including the central portion and both circumferential ends of the side wall 220c on the pulling-out direction side of the claw member 220 contacts the entire surface of the support wall 216a of the storage recess 216, and there may be a case where a partial region on the central portion side in the circumferential direction or a partial region on the both ends side contacts. In this way, due to the movement of the insertion portion 12, the claw member 220 in the storage recess 216 tilts with respect to the support wall 216a from the start of tilting to the end of tilting. The side wall 220c on the pulling-out direction side of the claw member 220 and the support wall 216a of the storage recess 216 avoid local contact at the end side by the recess as much as possible, and are supported for a long time from the start of tilting to the end of tilting in a wider region including the central side in the circumferential direction, thereby preventing damage due to local stress concentration at both circumferential ends between the side wall 220c on the pulling-out direction side of the claw member 220 and the support wall 216a of the storage recess 216.

[0067] Also, similar to the second embodiment, the same effect can be obtained by forming tapered portions (not shown) at both circumferential ends of the side wall 220c on the extraction direction side of the claw member 220.

[0068] As described above, in the detachment prevention device of the embodiment, there is a detachment prevention device having a storage recess 16 (160) formed with an opening facing the inner circumferential direction on the receiving port side with respect to the insertion port 12, and a claw member 200 (20) tiltably stored in the storage recess 16. In the storage recess 16 (160), a support wall 16 (160)a that supports and tilts one side wall 200 (20)c of the claw member 200 (20) extends in the circumferential direction. On the support wall 16a of the storage recess 16 or the side wall 20c of the claw member 20, a tapered surface 16b (tapered surface 20e) is formed on the end side in the circumferential direction. Therefore, due to the movement of the insertion port 12, the claw member 200 (20) in the storage recess 16 (160) tilts from the start of tilting to the end of tilting with respect to the support wall 16 (160)a, and the side wall 200 (20)c of the claw member 200 (20) and the support wall 16 (160)a of the storage recess 16 (160) avoid contact at the end side by the tapered surface 16b or the tapered surface 20e as much as possible, and are supported longer on the central side in the circumferential direction, so that damage due to stress concentration at both ends of the side wall 200 (20)c of the claw member 200 (20) and the support wall 16 (160)a of the storage recess 16 (160) can be prevented.

[0069] As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and changes and additions within the scope not departing from the gist of the present invention are also included in the present invention.

[0070] In the above-described Embodiments 1 and 2, the claw member 200(20), the storage recess 16(160), and the bolt 7 that constitute the movement prevention means are installed or formed on the detachment prevention tool 15. However, the present invention is not limited thereto. For example, as a detachment prevention device according to Modification Example 3, as shown in FIG. 15, an end portion 305 of the water pipe 302 itself is configured as a receiving portion, and a plurality of storage recesses 16(160) that open toward the outer peripheral surface of the insertion portion 312 of the water pipe 311 and house the claw member 200(20) therein are formed along the circumferential direction. Further, a bolt 307 screwed into a bolt hole 306 formed in communication with the storage recess 16(160) of the end portion 305 may be a detachment prevention device that presses each claw member 200(20) housed inside the storage recess 16(160). In this case, either forming a tapered surface 16b on the circumferential end side of the support wall 16a of the storage recess 16 as in Embodiment 1 or forming a tapered surface 20e on the circumferential end side of the side wall 20c of the claw member 20 as in Embodiment 2 may be selected.

[0071] Furthermore, as a detachment prevention device according to Modification Example 4, as shown in FIG. 16, the base portion and the arm portion that constitute the detachment prevention tool 415 may be an integral member. More specifically, an end portion on the receiving portion 405 side of the detachment prevention tool 415 is formed as a hook portion 415a having an inner diameter smaller than that of the bulging portion 405a of the receiving portion 405. By abutting along the circumferential direction with the bulging portion 405a, movement in one direction (left direction in the figure) of the pipe axis C is prevented. Further, an annular surface 415b having substantially the same diameter as the tip surface 405b of the receiving portion 405 is formed between the storage recess 16(160) and the hook portion 415a. By abutting along the circumferential direction with the tip surface 405b of the receiving portion 405, movement in the other direction (right direction in the figure) of the pipe axis C is prevented. The detachment prevention tool 415 is also applicable to a device that can relatively move a predetermined length in the pipe axis C direction with respect to the receiving portion 405 together with the water pipe 411 and prevents movement of the fluid pipe in both directions of the pipe axis C. In this case, either forming a tapered surface 16b on the circumferential end side of the support wall 16a of the storage recess 16 as in Embodiment 1 or forming a tapered surface 20e on the circumferential end side of the side wall 20c of the claw member 20 as in Embodiment 2 may be selected.

[0072] Further, as a detachment prevention device of Modification 5, as shown in FIG. 17, the present invention may be applied to the storage recess provided in the pressing ring and the claw member. More specifically, the water pipe 502 as the receiving pipe and the water pipe 511 as the insertion pipe are inserted through an annular sealing material 525 disposed over the entire circumference between the inner peripheral surface of the receiving portion 505 and the outer peripheral surface of the insertion portion 512. Further, an annular pressing ring 522 integrally formed is externally fitted and installed on the outer peripheral surface of the insertion portion 512. The pressing ring 522 has a pressing portion 522a protruding toward the flange 505a side of the receiving portion 505. The pressing ring 522 is connected by fastening a plurality of T-head bolt nuts 523 to the flange 505a. By approaching the pressing ring 522 and the flange 505a with this fastening, the sealing material 525 pressed by the pressing portion 522a is brought into close contact with the inner peripheral surface of the receiving portion 505 and the outer peripheral surface of the insertion portion 512, and the water pipe 502 as the receiving pipe and the water pipe 511 as the insertion pipe are connected in a sealed state. Then, the pressing ring 522 has a bolt 524 screwed in the inner diameter direction and presses the claw member 200 (20) disposed in the storage recess 16 (160). By biting into the outer peripheral surface of the water pipe 511, the claw member 200 (20) is fixed to the water pipe 511. The claw member 200 (20) and the bolt 524 of these pressing rings 522 are equally arranged in the circumferential direction. The detachment prevention device of the present invention can be applied to the pressing ring 522 having such a storage recess 16 (160) and the claw member 200 (20). In this case, as in Example 1, a tapered surface 16b may be formed on the circumferential end side of the support wall 16a of the storage recess 16, or as in Example 2, a tapered surface 20e may be formed on the circumferential end side of the side wall 20c of the claw member 20. Either one may be selected.

[0073] Further, although the pressing ring 522 of Modification 5 is integrally formed in the circumferential direction, it is not necessarily limited to this. The pressing ring provided on the fluid pipe to which the detachment prevention device of the present invention is applied may have a structure divided in the circumferential direction, for example.

Explanation of Signs

[0074] 2 Water pipe (receiving pipe) 5 Receiving portion 7 bolts (pressing part) 9a, 9b bolt nuts 11 water pipes (socket pipes) 12 socket part 15 anti-separation device 16, 160 storage recesses (claw chambers) 16a, 160a support walls 16b tapered part 20, 200 claw members 20a locking claw 20c, 20d side walls 20e tapered part 22, 522 pressing wheels

Claims

1. A detachment prevention device having a storage recess formed with an opening facing the inner circumferential direction on the receiving port side with respect to the insertion port pipe, and a claw member tiltably stored in the storage recess, wherein a support wall for supporting and tilting one side wall of the claw member is provided to extend in the circumferential direction within the storage recess, and one of the inner diameter side of the side wall of the claw member and the inner diameter side of the support wall is formed with a recess capable of contacting the other of the inner diameter side of the side wall of the claw member and the inner diameter side of the support wall on the end side in the circumferential direction, and the recess is formed only on the side opposite to the locking claw formed on one side wall of the claw member. The detachment prevention device is characterized by this.

2. The detachment prevention device according to Claim 1, wherein the recess is formed deeper toward the circumferential end.

3. The detachment prevention device according to Claim 1 or 2, wherein the recess is formed to be inclined with respect to the pipe diameter direction.

4. The detachment prevention device according to any one of Claims 1 to 3, wherein the recess is formed on both end sides in the circumferential direction.

5. A claw member tiltably stored in a storage recess formed with an opening facing the inner circumferential direction on the receiving port side with respect to the insertion port pipe, wherein a recess capable of contacting the inner diameter side of the storage recess is formed on the inner diameter side of the side wall of the claw member on the end side in the circumferential direction, and the recess is formed only on the side opposite to the locking claw formed on one side wall of the claw member. The claw member is characterized by this.

Images