JP5108638B2 - Piping prevention device - Google Patents

Description

  The present invention relates to an apparatus for preventing a pipe connected to an apparatus using gas or fossil fuel as an apparatus for heating and hot water supply.

  Conventionally, combustion equipment using gas or fossil fuel with relatively high thermal efficiency has been widely used for heating and hot water supply equipment. In recent years, the interior of houses has become highly airtight, and sufficient ventilation must be provided for the indoor use of such combustion equipment. Especially in cold northern homes and buildings, these devices must be used for a long time, and the importance of indoor ventilation is extremely high.

  Such combustion equipment is extended by connecting a plurality of single pipes or double pipes that have been manufactured in advance to a certain length as pipes for supplying and exhausting outside air (supply and exhaust pipes). Is common. When a pipe is extended by such a construction method, a pipe retaining device is usually provided for each connecting part of each pipe so that any connecting part is not detached and the pipe is not dropped.

  As a piping retaining device provided in such a combustion device, when the insertion port side of the other piping (inner tube) is inserted into the receiving port of one piping (outer tube), the lock part is at the tip of the insertion port. It is pushed up, welded and fixed from the cut window to the outside of the cut window, and fits in the escape space, the cover that forms the lock wall and the slide guide (the escape space). Further, when the inner tube insertion port side is inserted into the outer tube receiving port, the circumferential groove formed in the inner tube fits under the lock portion, and the lock portion falls into the circumferential groove by the elastic action of the lock member, and the inner tube And the outer tube are locked.

When a pulling force is applied to the inner tube and the outer tube, the engaging part is pressed by the lock wall, which causes a wedge effect on the locking part and strengthens the fitting relationship with the circumferential groove. Is done. As a result, the inner pipe and the outer pipe are prevented from falling off at the connecting portion. Further, when the inner tube and the outer tube are pulled out and removed, the insertion port side is pushed once and the lock member is retracted together to release the engagement portion of the lock portion from the lock wall to the escape space side. Then, in this state, by pressing the stopper operating portion of the lock member with the fingertip and pulling the insertion port side, the lock portion is lifted along the edge of the circumferential groove and is accommodated in the escape space from the cut window, and both The pipes are configured to be pulled out by being separated from each other. Thereby, it has comprised so that an inner pipe and an outer pipe can be attached or detached easily (refer patent document 1).
JP 2000-304182 A

  However, the conventional piping retaining device for connecting the inner pipe and the outer pipe cannot insert the lock member into the gap between the slide guide and the outer pipe after the cover is welded and fixed to the outer pipe. It was. Therefore, after inserting the lock member into the gap between the slide guide and the outer tube, the cover is welded and fixed to the outer tube. For this reason, when the lock member is deformed and does not serve as a retaining device, the welded cover is removed from the outer tube, the lock member is inserted again into the gap between the slide guide and the outer tube, and then the cover is removed. There was a troublesome problem that the outer tube had to be fixed by welding.

  The present invention has been made to solve the problems of the related art. The stopper can be easily attached / detached without fixing by welding, and the inner tube and the outer tube can be attached / detached. An object of the present invention is to provide a piping retaining device that can be easily performed.

  That is, the pipe retaining device according to the present invention includes an outer tube, an inner tube inserted into the outer tube from one end of the outer tube, and one end of the outer tube. Protruding protrusions, a recess formed at the end of the inner tube that is inserted into the outer tube, and recessed inward in the radial direction of the inner tube, and an elasticity attached to the outer tube corresponding to the protruding portion. The protrusion has a low protrusion, an insertion hole formed in a side surface of the low protrusion on the one end side of the outer tube, and a side opposite to the one end of the outer tube of the low protrusion. A high projecting portion, a projecting portion side engaging portion formed in the low projecting portion, and a riding portion that is located on the high projecting portion side of the projecting portion side engaging portion and projects higher than the low projecting portion, The stopper includes an outer side, an inner side continuously folded at a bent portion at one end of the outer side, a first engaging portion configured at the other end of the inner side, A second engaging portion formed on the bent portion side of the engaging portion, and the inner side enters the protruding portion from the insertion hole of the protruding portion, and protrudes by the outer side and the inner side. When the inner tube moves in the direction in which the inner tube is pulled out from the outer tube, the first engaging portion at the other end of the inner side of the stopper is engaged with the recessed portion of the inner tube. And the second engaging portion is engaged with the protruding portion side engaging portion of the protruding portion to prevent the pulling out, and the concave portion of the inner tube corresponds to the high protruding portion of the protruding portion. Then, when the stopper is moved in the direction in which the other end of the outer side rides on the riding part of the protrusion, the first engaging part at the other end of the inner side of the stopper is disengaged from the recessed part of the inner tube. And

  Further, in the pipe retaining device according to the second aspect of the present invention, in the above, the protruding portion side engaging portion of the protruding portion is an engaging hole formed in the upper surface of the low protruding portion, and the second engagement of the stopper. The joint portion is an engagement side that protrudes inward from the outer side. When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the engagement side of the stopper is in the engagement hole of the protrusion. It is characterized by entering and engaging.

  Further, in addition to claim 2, the pipe retaining device according to the invention of claim 3 is formed at the other end portion of the outer side, and the inclined portion inclined in the direction in which the tip side is separated from the inner side, The stopper is moved in a direction to be formed on the other end portion of the inner side, having a curved portion that curves to the outer side and has a tip that becomes the first engaging portion, and the inclined portion rides on the riding portion of the protruding portion. In this case, the curved portion enters the inside of the high protruding portion while contacting the inner surface of the wall on one end side of the outer tube of the high protruding portion, the first engaging portion is detached from the recessed portion, and the outside of the high protruding portion is The wall on the one end side of the tube and the inclined portion of the stopper are separated from each other toward the tip of the inclined portion.

  According to a fourth aspect of the present invention, there is provided the pipe retaining device according to the first aspect, wherein the protrusion-side engagement portion of the protrusion is an engagement recess formed as a recess in the low protrusion, The engaging portion is a through hole formed on the inner side. When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the engaging concave portion of the protruding portion enters the through hole of the stopper. It is characterized by engaging.

  According to a fifth aspect of the present invention, there is provided the pipe retaining device according to the fourth aspect, wherein the stopper is formed at the other end of the outer side, and the inclined portion is inclined in a direction in which the tip side is separated from the inner side. And a protruding portion that is formed on the outer side of the bent portion side and protrudes toward the inner side.

  According to a sixth aspect of the present invention, in the pipe retaining device according to the fourth or fifth aspect, the stopper is formed at the other end of the inner side and is curved toward the outer side so that the tip is the first engagement. It has a curved part that becomes a joint part, and the through hole of the stopper extends to the surface on the bent part side of the curved part, and on the surface opposite to the outer side of the curved part located on both sides of the through hole A reinforcing rib is formed.

  According to a seventh aspect of the present invention, there is provided the piping retaining device according to any one of the first to sixth aspects, wherein the bent portion of the stopper is curved, and the outer edge of the insertion hole of the outer tube is provided on the outer edge of the outer tube. When a guide portion having an arcuate cross section that protrudes outward in the radial direction of the tube is formed and the stopper is moved in a direction in which the other end of the outer side rides on the riding portion of the protruding portion, the bent portion of the stopper is outside the guide portion. It corresponds to the curved surface opposite to the one end side of the tube.

  According to an eighth aspect of the present invention, there is provided the piping retaining device according to any one of the first to seventh aspects, wherein the projecting portion is formed integrally with the outer tube, and the recessed portion is the entire inner tube. It is characterized by being formed continuously over the circumference.

  According to the present invention, an outer tube, an inner tube that is inserted into the outer tube from one end of the outer tube, a protrusion that is configured near one end of the outer tube and protrudes radially outward of the outer tube, The inner tube includes a recessed portion that is formed at an end portion of the inner tube that is inserted into the outer tube and is recessed radially inward of the inner tube, and a stopper having elasticity that is attached to the outer tube corresponding to the protruding portion. The protruding portion includes a low protruding portion, an insertion hole formed on a side surface of the low protruding portion on one end side of the outer tube, a high protruding portion continuous on the side opposite to the outer tube one end side of the low protruding portion, A protrusion portion engaging portion formed in the protrusion portion, and a riding portion that is located on the high protrusion portion side of the protrusion portion side engagement portion and protrudes higher than the low protrusion portion, and the stopper includes an outer side , An inner side continuously folded at a bent portion at one end of the outer side, a first engaging portion configured at the other end of the inner side, and bent more than the first engaging portion A second engaging portion formed on the side, the inner side enters the protruding portion from the insertion hole of the protruding portion, and the outer tube is sandwiched between the outer side and the inner side. When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the first engagement portion at the other end of the inner side of the stopper is engaged with the recessed portion of the inner tube, and the second Pulling out is prevented by engaging the engaging portion with the protruding portion side engaging portion of the protruding portion, and the other end of the outer side is in a state where the recessed portion of the inner tube corresponds to the high protruding portion of the protruding portion. When the stopper is moved in the direction of riding on the riding part of the protruding part, the first engaging part at the other end of the inner side of the stopper is separated from the recessed part of the inner tube. The protruding portion side engaging portion of the portion is an engaging hole formed on the upper surface of the low protruding portion, and the second engaging portion of the stopper protrudes from the outer side to the inner side. When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the engaging side of the stopper enters the engagement hole of the protrusion and engages. It is possible to reliably prevent the inner tube from coming off. This prevents the welded cover from being removed from the outer tube when the stopper is deformed and does not serve as a pipe retainer as in the case of the conventional lock member, and the lock member is again inserted into the gap between the slide guide and the outer tube. After the insertion, there is no troublesome work such as welding and fixing the cover to the outer tube. Therefore, when the stopper is deformed, the stopper can be removed and replaced simply by lifting the inclined part by hand to disengage the engaging side from the engaging hole and moving it toward one end of the outer tube. The convenience of the apparatus can be greatly improved.

  According to the invention of claim 3, the stopper is formed at the other end portion of the outer side, and is formed at the inclined portion whose tip side is inclined in the direction away from the inner side and the other end portion of the inner side, When the stopper is moved in the direction in which the inclined part rides on the riding part of the protruding part, the curved part is outside the high protruding part. While coming into contact with the inner surface of the wall on the one end side of the tube, the inside of the high projecting portion enters, the first engaging portion is detached from the recessed portion, and the wall on the one end side of the outer tube of the high projecting portion and the inclined portion of the stopper As the tip of the inclined portion is further away from each other, the stopper is lowered from the riding portion by the elastic force of the stopper that attempts to bring the outer side and the inner side closer, and the curved portion is It can be automatically moved in the direction of detaching from the inner side of the high protrusion to the one end side of the outer tube. Thereby, in a state where the stopper is attached to the outer tube, the engaging portion of the inner side tip of the stopper can be reliably engaged with the recessed portion of the inner tube, so just by inserting the inner tube into the outer tube, The stopper surely functions to prevent it from coming off.

  In particular, since the inclined portions of the stopper are separated from each other toward the tip of the inclined portion, it is possible to prevent the curved portion of the stopper from stopping in the other end direction of the outer tube. While being able to position in one end direction, it becomes possible to always make the 1st engaging part engage with a recessed part. As a result, it is possible to prevent the first engaging portion from engaging with the recessed portion of the inner tube or the first engaging portion from being detached from the recessed portion of the inner tube. . Therefore, it is possible to reliably prevent inconveniences such as the inner tube inserted into the outer tube coming out.

  According to the invention of claim 4, the protrusion-side engagement portion of the protrusion is an engagement recess formed in the low protrusion, and the second engagement portion of the stopper is formed on the inner side. When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the engaging recess of the protruding portion enters and engages with the stopper through-hole. The stopper dimension between the through holes can be made extremely short. Thereby, the intensity | strength of the stopper of the direction which pulls out an inner pipe | tube from an outer pipe | tube can be improved significantly. Therefore, inconveniences such as the stopper being deformed and the inner tube inserted into the outer tube coming out can be reliably prevented.

  According to the invention of claim 5, the stopper is formed at the other end portion of the outer side, and the tip side is inclined in a direction away from the inner side, and the outer side of the inclined portion on the bent portion side. Since the protrusion is formed and protrudes toward the inner side, when the stopper is moved in the direction in which the protrusion rides on the riding part of the protrusion, the distance between the inner side and the outer side of the stopper should be increased. Is possible. Thereby, the urging | biasing force which the inner side and outer side which were spaced apart narrow can be enlarged further. Accordingly, it is possible to prevent the curved portion of the stopper from stopping in the direction of the other end of the outer tube, and to be surely positioned in the direction of the one end of the outer tube. Inconvenient in that it does not engage with the recessed portion of the inner tube, or prevents the first engaging portion from detaching from the recessed portion of the inner tube, and the inner tube inserted into the outer tube falls out. Can be reliably prevented.

  According to the invention of claim 6, the stopper is formed at the other end portion of the inner side, has a curved portion that is curved toward the outer side and has a distal end serving as the first engaging portion. The hole extends to the surface of the bending portion on the bent portion side, and reinforcing ribs are formed on the surface opposite to the outer side of the bending portion located on both sides of the through hole. Deformation stress can be greatly improved. As a result, it is possible to prevent the inconvenience that the curved portion of the stopper is deformed when a force in the pulling direction is applied to the inner tube and the outer tube. Accordingly, it is possible to reliably prevent the inner tube inserted into the outer tube from being pulled out by the stopper.

  According to the invention of claim 7, the bent portion of the stopper is curved, and a guide portion having an arcuate cross section protruding outward in the radial direction of the outer tube is formed at the lower edge of the insertion hole of the outer tube. When the stopper is moved in a direction in which the other end of the outer side rides on the riding part of the protruding part, the bent part of the stopper corresponds to the curved surface on the opposite side to the one end side of the outer pipe of the guide part. By using the curved surface and the curved shape of the bent part, if the other end of the outer side of the stopper is moved in the direction to ride on the riding part of the protruding part, the bent part of the stopper can be smoothly pushed into the inner tube as it is. it can. As a result, the first engaging portion configured at the other end of the inner side moves in a direction further away from the inner tube, so that the first engaging portion can be more reliably and easily removed from the recessed portion. It can be separated into the high protrusion.

  Further, according to the invention of claim 8, since the projecting portion is formed integrally with the outer tube and the recessed portion is formed continuously over the entire circumference of the inner tube, the stopper is It is possible to perform a function of preventing the inner tube and the outer tube from coming off at any position around the tube. Therefore, the convenience of the piping retaining device can be greatly improved.

  The main feature of the present invention is that when the stopper is deformed and does not serve as a retaining device, the stopper can be easily attached and detached without welding. For the purpose of easily attaching and detaching the stopper without fixing by welding, it is formed on the other end part of the outer side, and the tip part is inclined to the direction away from the inner side and the other end part of the inner side. This was realized by a stopper provided with a curved portion that was formed and curved toward the outer side and the tip became an engaging portion.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a pipe (showing a state where the inner pipe 30 is inserted into the outer pipe 12) provided with a pipe retaining device 10 according to an embodiment of the present invention, and FIG. The perspective view of the outer tube | pipe 12 which shows the state which inserts the stopper 40 in the protruding part 14 which was done, FIG. 3 has each shown the front view of the stopper 40 which comprises the removal prevention apparatus 10 of the piping of this invention.

  The piping retaining device 10 according to the present embodiment prevents the piping (the inner tube 30 and the outer tube 12) connected to a device using gas or fossil fuel as a heating or hot water supply device from falling off at the connecting portion. As shown in FIG. 1, the inner tube 30 having the recessed portion 32 is inserted into the outer tube 12 having the protruding portion 14, and the protruding portion 14 and the recessed portion 32 are connected to the stopper 40. It is configured so that it does not fall off when engaged.

  The pipe retaining device 10 includes a protruding portion 14 that is formed integrally with the outer tube 12, a recessed portion 32 that is formed integrally with the inner tube 30, and an inner tube that is inserted into the outer tube 12. The stopper 40 is configured to be engaged with the protruding portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 so as not to come off. As shown in FIG. 2, the outer tube 12 includes a protruding portion 14 in the vicinity of one end. The protruding portion 14 is formed to protrude outward in the radial direction of the outer tube 12, and the recessed portion 32 is formed in the radial direction of the inner tube 30. A recess is formed on the inside. The outer tube 12 and the inner tube 30 are formed in a cylindrical shape with a stainless steel metal plate having a thickness of about 0.3 mm. The stopper 40 will be described in detail later.

  The protrusion 14 includes a low protrusion 16 and a high protrusion 24. The low protrusion 16 has a width of about 10.2 mm (dimension in the circumferential direction of the outer tube 12) and a height of about 1.0 mm (protrusion). Dimension) and a length of about 10.2 mm (longitudinal dimension of the outer tube 12), and the side surface of one end side (the side where the inner tube 30 of the outer tube 12 is inserted) of the low protrusion 16 is open. Thus, an insertion hole 18 is formed. The high protrusion 24 is formed so as to protrude continuously from the low protrusion 16, and the high protrusion 24 is formed on the side opposite to one end side of the outer tube 12, and is approximately twice as high as the low protrusion 16. It is formed to protrude. The insertion hole 18 has a width of about 10.2 mm, which is the same as that of the low protrusion 16, and a height of about 1.0 mm, which is the same as that of the low protrusion 16.

  An engaging hole 20 (corresponding to the protruding portion side engaging portion of the present invention) penetrating the inside and outside of the low protruding portion 16 is formed on the upper surface of the low protruding portion 16. A ride-up portion 22 that is located on the side of the portion 24 and protrudes higher than the low protrusion portion 16 is formed. The engagement hole 20 is formed from the approximate center of one end side and the other end side (one end side direction and the other end side direction of the outer tube 12) of the low projecting portion 16 to the riding portion 22, and the riding portion 22 is It is formed at the same height as the high protrusion 24. Further, the engagement hole 20 and the riding-up portion 22 are formed to have a width of about 3 mm, and are formed at the approximate center of the width direction of the low protrusion 16 (circumferential direction of the outer tube 12).

  In addition, an inclined wall 26 (shown in FIG. 6) is formed on the low protruding portion 16 side of the high protruding portion 24, and the inclined wall 26 is formed on both sides of the riding portion 22, and the high protruding portion. The diameter of the outer tube 12 is inclined in the direction of the radial center from the substantially longitudinal center of 24 toward the one end of the outer tube 12. In other words, the inclined wall 26 is formed between the most protruding portion of the high protruding portion 24 and the low protruding portion 16. The side opposite to the low protrusion 16 of the high protrusion 24 is also inclined in the radial center direction of the outer tube 12 as it is separated from the low protrusion 16 side like the inclined wall 26. And this high protrusion part 24 is comprised so that the curved part 56 of the stopper 40 may be located in the said high protrusion part 24, and may be settled. Reference numeral 28 denotes an O-ring insertion protrusion, and an O-ring (not shown) is inserted into the O-ring insertion protrusion 28, and the gap between the outer tube 12 and the inner tube 30 is closed by the O-ring.

  Further, the inner tube 30 is formed with a recessed portion 32 that is recessed in a predetermined dimension radially inward of the inner tube 30, and the recessed portion 32 of the inner tube 30 is inserted into the outer tube 12 by the inner tube 30. It is formed in the whole circumference | surroundings near the edge part (other end of the inner tube | pipe 30) of the side to be done. The recessed portion 32 is provided with an engaging wall 34 against which an engaging portion 58 of a stopper 40 to be described later comes into contact with the other end side of the inner tube 30. Specifically, the engagement wall 34 of the recessed portion 32 is formed near the other end of the inner tube 30 and perpendicular to the longitudinal direction of the inner tube 30, and is directed toward the radial center of the inner tube 30. Is formed. Thus, the engaging portion 58 of the stopper 40 that is in contact with the engaging wall 34 is configured not to be detached from the recessed portion 32.

  Further, the inner tube 30 is inserted into the outer tube 12, and the predetermined position of the inner tube 30 with the protruding portion 14 (high protruding portion 24) of the outer tube 12 and the recessed portion 32 of the inner tube 30 corresponding to each other. In addition, a positioning projection 36 with which one end of the outer tube 12 abuts is formed to project outward in the radial direction. That is, when the inner tube 30 is inserted into the outer tube 12, only the one end of the outer tube 12 is brought into contact with the positioning protrusion 36 of the inner tube 30. The concave portion 32 is configured to correspond to the concave portion 32. Thereby, the high protrusion part 24 of the outer tube | pipe 12 and the recessed part 32 of the inner tube | pipe 30 can be easily aligned.

  On the other hand, a stopper 40 (curved portion 56) is provided corresponding to the protruding portion 14 of the outer tube 12, and this stopper 40 has elasticity, is resistant to heat, and is not easily rusted (for example, Stainless steel having a plate thickness of about 0.4 mm or a spring material such as phosphor bronze). In other words, the stopper 40 is made of a metal plate that is stronger than the inner tube 30 and the outer tube 12 so as not to be deformed. As shown in FIG. 3, the stopper 40 is formed to have a width of about 10 mm, an outer side 42 having a length of about 13.5 mm, and a length of about 16. The inner side 52 of 6 mm is comprised. The outer side 42 and the inner side 52 are located on one end side of the stopper 40, are formed continuously and integrally on both sides of the bent portion 62, and are formed in a side hairpin shape by the bent portion 62. In this case, one side extending from the bent portion 62 and inserted into the insertion hole 18 of the projecting portion 14 is referred to as an inner side 52, and the other side is referred to as an outer side 42.

  As shown in FIG. 4, the outer side 42 includes an outer side main body 44, an inclined portion 46 formed at the other end of the outer side main body 44, and an engaging side 48 (corresponding to a second engaging portion of the present invention). ). The inclined portion 46 is formed in a shape in which the distal end side of the outer side main body 44 is bent and inclined in a direction away from the inner side 52, and the engaging side 48 is connected to the inclined portion 46 at one end side of the engaging hole 20. It is configured to be able to engage with the low protrusion 16 on the (insertion hole 18 side). The bent portion 62 side of the stopper 40 is referred to as one side, and the inclined portion 46 and the curved portion 56 side are referred to as the other side.

  The engagement side 48 is located approximately in the center of the outer side main body 44 in the width direction and is formed with a length of about 1.9 mm and a width of about 2.5 mm. More specifically, the engaging side 48 is formed by punching a part of the outer side main body 44, the tip extends toward the inner side 52, and the base is integrally connected to the inclined part 46 so as to be substantially the same as the inclined part 46. It is formed in a straight line state. The inclined portion 46 and the inclined wall 26 formed on the low protruding portion 16 side of the high protruding portion 24 are expanded toward the O-ring insertion protruding portion 28 (FIG. 9). The reason why the inclined portion 46 and the inclined wall 26 are expanded in the direction of the O-ring insertion protrusion 28 will be described in detail later.

  The inner side 52 includes an inner side main body 54, a curved portion 56 formed at the other end of the inner side main body 54, and a through hole 60 (only shown in FIG. 5) formed in the inner side main body 54. (Figs. 4 and 5). The bending portion 56 is formed by the other end portion of the inner side main body 54 protruding in the direction of the inclined portion 46 of the outer side 42 and the tip extending in a direction away from the inclined portion 46. An engaging portion 58 (corresponding to the first engaging portion of the present invention) is formed at the tip of the curved portion 56. The through hole 60 is for releasing the lower end (outer side 42 side) of the engaging side 48.

  The engaging portion 58 extends below a predetermined dimension from the inner side main body 54 (in this case, extends about 1.8 mm away from the outer side 42 with respect to the inner side 52). The inner side 52 and the outer side 42 are parallel, or the other end side (the inclined portion 46 and the inclined portion 46 side) is narrower than the one end side (the bent portion 62 side) of the stopper 40 (illustrated by a dotted line in FIG. 4). Is formed. And when the other end side of the inner side 52 and the outer side 42 is separated, the elastic force acts in the direction in which the other end side of the inner side 52 and the outer side 42 approaches. The engaging portion 58 is engaged in the recessed portion 32 formed in the inner tube 30 as described above.

  Next, connection and extraction of piping (the inner tube 30 and the outer tube 12) using the piping retaining device 10 in the present embodiment will be described with reference to FIGS. 1, 2, 6, and 7. FIG. First, the stopper 40 is inserted into the outer tube 12. In this case, the stopper 40 is attached by inserting the engaging portion 58 into the insertion hole 18 formed in the side surface of the one end side of the low projecting portion 16 of the outer tube 12 as indicated by an arrow in FIG. Then, the inner side main body 54 is inserted, and the stopper 40 is inserted into the protruding portion 14 of the outer tube 12 (FIGS. 1 and 6). In this state, the engagement side 48 of the outer side 42 gets over the low protrusion 16 and is inserted into the engagement hole 20.

  Next, as shown by an arrow in FIG. 1, the other end of the inner tube 30 is inserted into the outer tube 12 from one end of the outer tube 12, and the outer tube is inserted into the positioning projection 36 provided on the inner tube 30. One end of 12 is brought into contact. In this state, the protrusion 14 formed on the outer tube 12 as described above and the recessed portion 32 formed on the inner tube 30 correspond to each other, and the engaging portion 58 of the stopper 40 is formed on the inner tube 30. The outer tube 12 and the inner tube 30 are connected to each other at the connecting portion (one end portion of the outer tube 12 and the other end portion of the inner tube 30) (FIG. 6). As a result, substantially the entire outer side main body 44 is in contact with the outer tube 12, and the curved portion 56 of the inner side 52 is in contact with the inclined portion 46. That is, the stopper 40 has an elastic action so as to sandwich the thickness of the outer tube 12 (an elastic force acts on the rising portion 22 of the protruding portion 14 and the inclined wall 26 at the inclined portion 46 and the curved portion 56). It is configured (FIG. 7).

  At this time, the inner tube 30 is formed with a recessed portion 32 around the entire inner tube 30, and the protrusion 14 formed on the outer tube 12 and the inner tube 30 are located at any position around the inner tube 30. The recessed portion 32 formed around the tube 30 can be brought into a corresponding state. Thereby, the engaging portion 58 of the stopper 40 can be inserted into any position of the recessed portion 32 around the inner tube 30. Therefore, it is not necessary to rotate the inner tube 30 or the outer tube 12 to align the engaging portion 58 of the stopper 40, so that the connecting operation between the outer tube 12 and the inner tube 30 can be performed very easily. Become.

  Then, in a state where the outer tube 12 and the inner tube 30 are connected at the connecting portion, the outer tube 12 and the inner tube 30 move away from each other as indicated by arrows in FIG. When the inner tube 30 is moved in the direction of pulling out 30, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 comes into contact with the recessed portion 32 (engaging wall 34) of the inner tube 30. In this state, the projecting portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 are shifted from the corresponding state to the left and right (the O-ring insertion projecting portion 28 and the recessed portion 32 are shifted in a direction away from each other). ). As a result, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 is engaged in the recessed portion 32 of the inner tube 30, and the engaging side 48 of the outer side 42 enters the engaging hole 20, Engage with the edge of the engagement hole 20 of the low protrusion 16. That is, the stopper 40 prevents the outer tube 12 and the inner tube 30 from being pulled out.

  Next, how to remove the inner tube 30 from the outer tube 12 from the state where the outer tube 12 and the inner tube 30 are prevented from being pulled out by the engagement of the stopper 40 will be described with reference to FIGS. First, as shown in FIG. 9, one end of the outer tube 12 is brought into contact with the positioning protrusion 36 of the inner tube 30, and the projecting portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30. To correspond. In this state, the sloped portion 46 and the curved portion 56 push the moving portion 22 of the projecting portion 14 and the stopper 40 whose elastic force is acting on the inclined wall 26 toward the O-ring insertion projecting portion 28 to move. When the positioning projection 36 is not provided on the inner tube 30, the protrusion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 may be made to correspond to each other.

  Specifically, when the stopper 40 is pushed and moved in the direction of the O-ring insertion protrusion 28, the inclined portion 46 comes into contact with the riding-up portion 22, and the stopper 40 is further moved in the direction of the O-ring insertion protrusion 28. Then, the inclined portion 46 of the stopper 40 that exerts an elastic force so as to sandwich the outer tube 12 (plate thickness) rides on the riding portion 22 while contacting the riding portion 22. At this time, the bending portion 56 is in contact with the inner surface of the inclined wall 26 (corresponding to contact with the inner surface of the wall on the one end side of the outer tube 12 of the present invention) and in the direction of the O-ring insertion protrusion 28 (specifically, a high protrusion). The portion 24 moves in the most protruding direction.

  In the state where the bent portion 62 of the stopper 40 is pressed against one end of the outer tube 12, the inclined portion 46 of the stopper 40 rides on the riding portion 22 and the bending portion 56 is elastic force of the stopper 40 as shown in FIG. 10. Therefore, the inclined wall 26 is located at the most protruding portion (high protruding portion 24) or in the vicinity of the high protruding portion 24. As a result, the inclined portion 46 is separated from the recessed portion 32 toward the outer tube 12 and is positioned and accommodated in the high protruding portion 24 of the protruding portion 14.

  If the inner tube 30 is separated from the outer tube 12 in this state, the engaging portion 58 of the stopper 40 can be pulled out without being caught by the recessed portion 32 (engaging wall 34) of the inner tube 30. That is, when the inner tube 30 is pulled out from the outer tube 12, the stopper 40 is moved in the direction of the O-ring insertion protrusion 28, and the bent portion 62 of the stopper 40 is pressed against one end of the outer tube 12. Since 56 is accommodated in the high protrusion 24, the engaging portion 58 of the stopper 40 can be easily detached from the recessed portion 32 of the inner tube 30. If the inner tube 30 is separated from the outer tube 12 in this state, the inner tube 30 can be easily moved from the outer tube 12 without the engaging portion 58 being caught by the recessed portion 32 (engagement wall 34). Can be pulled out.

  Next, in a state where the outer tube 12 and the inner tube 30 are prevented from being pulled out by the engagement of the stopper 40, the inner tube 30 is pulled out from the outer tube 12 unless the inner tube 30 is removed from the outer tube 12. The explanation that it is not possible will be described with reference to FIGS. First, an example in which the inner tube 30 comes off from the outer tube 12 will be described. This is a case where the inclined portion 46 and the inclined wall 26 formed on the low protruding portion 16 side of the high protruding portion 24 are parallel without expanding toward the O-ring insertion protruding portion 28.

  That is, when the inner side main body 54 and the outer side main body 44 are parallel (between arrows A and B in FIG. 7) and the engaging portion 58 of the stopper 40 enters the recessed portion 32 of the inner tube 30, the stopper In the state where the 40 engaging portions 58 are located in the protruding portion 14 (in the high protruding portion 24) of the outer tube 12, the entire stopper 40 enters the high protruding portion 24 on the curved portion 56 side, and the radius of the outer tube 12. Although tilted outward (FIG. 11), the inner side 52 and the outer side 42 are in a parallel state. Further, even when the stopper 40 moves in the direction of the O-ring insertion protrusion 28 with the curved portion 56 in contact with the inclined wall 26, the engaging portion 58 of the stopper 40 is detached from the recessed portion 32 of the inner tube 30. Even so, the inner side 52 and the outer side 42 remain parallel. In this case, since the other side of the stopper 40 (in the direction of the O-ring insertion protrusion 28) is not widened, the stopper 40 does not receive an elastic force for returning in the direction of the low protrusion 16 and the engaging portion of the stopper 40 58 remains detached from the inside of the recessed portion 32 of the inner tube 30, and the inner tube 30 comes out of the outer tube 12.

  Thus, when the inclined wall 26 and the inclined portion 46 are parallel, the stopper 40 is in the state where the engaging portion 58 of the stopper 40 is detached from the recessed portion 32 of the inner tube 30, and the stopper 40 is in the outer tube 12 (protruding portion). 14), the stopper 40 does not have an elastic force for returning to the low protruding portion 16 direction, so that the inner tube 30 may be removed from the outer tube 12. Even when some external force is applied and the stopper 40 moves and the engaging portion 58 of the stopper 40 is disengaged from the recessed portion 32 of the inner tube 30, the stopper 40 moves toward the low protruding portion 16. Since the elastic force to be restored does not work and the engaging portion 58 does not return into the recessed portion 32 of the inner tube 30, the inconvenience that the inner tube 30 comes out from the outer tube 12 similarly occurs.

  Therefore, in the present invention, the inclined portion 46 and the inclined wall 26 as described above are configured to expand toward the ring insertion protrusion 28 (FIG. 9). In this case, as shown in FIG. 12, the stopper 40 moves in the direction of the O-ring insertion protrusion 28, the bending portion 56 is positioned in the high protrusion 24, and the engaging portion 58 of the stopper 40 is recessed in the inner tube 30. When separated from the portion 32, the other side of the stopper 40 (the inclined portion 46 and the recessed portion 32) is expanded by the riding portion 22 and the inclined wall 26, and the elasticity that returns the curved portion 56 toward the low protruding portion 16. Power works. As a result, the curved portion 56 of the stopper 40 that is widened is subjected to an elastic force that moves in the direction of the low protrusion 16 from the high protrusion 24 by the inclined wall 26. Therefore, the engaging portion 58 of the stopper 40 can be returned into the recessed portion 32 of the inner tube 30 or easily returned from the state where the engaging portion 58 is detached from the recessed portion 32 of the inner tube 30.

  That is, when the stopper 40 moves in the direction of the O-ring insertion protrusion 28 and the inclined portion 46 rides on the riding portion 22 of the protruding portion 14, the stopper 40 is expanded on the other side (the inclined portion 46 and the curved portion 56). Therefore, the elastic force in the narrowing direction of the expanded stopper 40 increases, and the load that moves in the direction of the O-ring insertion protrusion 28 increases. Further, when the stopper 40 is moved in a direction (one end side of the outer tube 12) that descends from the riding portion 22 on the inclined portion 46 that rides on the riding portion 22 of the protruding portion 14, the inclined portion 46 of the stopper 40. Since the bending portion 56 is narrowed, the load is reduced in the direction in which the stopper 40 is separated from the O-ring insertion protrusion 28.

  As a result, the curved portion 56 can always be positioned on the low protruding portion 16 side, so that the engaging portion 58 at the other end of the inner side 52 of the stopper 40 is detached from the recessed portion 32 of the inner tube 30. Inconveniences such as this can be prevented in advance. Therefore, the engaging portion 58 can always be positioned in the recessed portion 32 of the inner tube 30 due to the elastic force of the stopper 40, so that the inner tube 30 inserted into the outer tube 12 comes off. Can be reliably prevented.

  On the other hand, when the stopper 40 is deformed and does not serve as a retaining device, the inclined portion 46 is lifted by hand while the inner tube 30 is pulled out from the outer tube 12, and the engagement hole 20 formed in the low protruding portion 16 is formed. Then, the engagement side 48 is disengaged and the stopper 40 is moved in the direction of one end of the outer tube 12 as it is. Thereby, the stopper 40 can be removed from the protrusion 14. After that, it is inserted into the insertion hole 18 formed in the low projecting portion 16 of the outer tube 12 as described above from the engaging portion 58 of the new stopper 40 which is not deformed and has no problem in preventing the pipe from coming off. If the bending portion 56 is also inserted and positioned on the protruding portion 14 of the outer tube 12, the stopper 40 can be attached to the protruding portion 14. Thereby, it is possible to save the trouble of removing the cover by welding as in the prior art, and the stopper 40 can be attached and detached very easily.

  In this manner, the outer tube 12, the inner tube 30 inserted into the outer tube 12 from one end of the outer tube 12, and the vicinity of one end of the outer tube 12, projecting outward in the radial direction of the outer tube 12. A projecting portion 14 that is formed on an end portion of the inner tube 30 that is inserted into the outer tube 12, and a concave portion 32 that is recessed inward in the radial direction of the inner tube 30, and an outer portion corresponding to the projecting portion 14. And a stopper 40 having elasticity attached to the tube 12, and the protruding portion 14 includes a low protruding portion 16, an insertion hole 18 formed on a side surface of the low protruding portion 16 on one end side of the outer tube 12, and a low protruding portion. A high projecting portion 24 that is continuous to the side opposite to one end side of the outer tube 12 of the portion 16, an engagement hole 20 formed in the low projecting portion 16, and the high projecting portion 24 side of the engagement hole 20. The stopper 40 has an outer side 42 and one end of the outer side 42. The inner side 52 continuously folded at the bent portion 62, the engaging portion 58 formed at the other end of the inner side 52, and the bent portion 62 side of the engaging portion 58 are formed. The inner side 52 enters the projection 14 from the insertion hole 18 of the projection 14, and the outer tube 12 is sandwiched between the outer side 42 and the inner side 52. When the inner tube 30 moves in the direction in which the inner tube 30 is pulled out from the outer tube 12, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 engages with the recessed portion 32 of the inner tube 30, In addition, the engagement side 48 is engaged with the engagement hole 20 of the projecting portion 14 to prevent extraction, and the recessed portion 32 of the inner tube 30 corresponds to the high projecting portion 24 of the projecting portion 14. When the stopper 40 is moved in a direction in which the other end of the outer side 42 rides on the riding part 22 of the protrusion 14, Since the engaging portion 58 at the other end of the inner side 52 of the stopper 40 is disengaged from the recessed portion 32 of the inner tube 30, if the inner tube 30 moves in the direction of pulling out the inner tube 30 from the outer tube 12, Since the marginal edge 48 enters and engages in the engagement hole 20 of the projecting portion 14, it is possible to reliably prevent the inner tube 30 from coming off from the outer tube 12.

  As a result, when the stopper 40 is deformed as in the conventional lock member and does not serve as the pipe retaining device 10, the welded cover is removed from the outer tube 12, and the lock member is again connected to the slide guide and the outer tube 12. After the insertion into the gap, there is no troublesome trouble such as fixing the cover to the outer tube 12 by welding. Therefore, when the stopper 40 is deformed, the stopper 40 can be removed and replaced simply by lifting the inclined portion 46 by hand to disengage the engagement side 48 from the engagement hole 20 and moving it toward the one end of the outer tube 12. The convenience of the pipe retaining device 10 can be greatly improved.

  The stopper 40 is formed at the other end portion of the outer side 42, and the tip end side is inclined at a direction away from the inner side 52, and is formed at the other end portion of the inner side 52, and on the outer side 42 side. When the stopper 40 is moved in a direction in which the inclined portion 46 rides on the riding portion 22 of the protruding portion 14, the bending portion 56 becomes the high protruding portion 24. While entering the inner surface of the wall on the one end side of the outer tube 12, the inner portion enters the inside of the high protruding portion 24, and the engaging portion 58 is detached from the recessed portion 32. Since the inclined portions 46 of the stopper 40 are separated from each other toward the tip of the inclined portion 46, the stopper 40 is inclined by the elastic force of the stopper 40 trying to bring the outer side 42 and the inner side 52 closer to each other. 46 descends from the riding-up portion 22 and the bending portion 5 There will be automatically moved to the direction away the outer tube 12 one end of a high protrusion 24 inward. Thus, with the stopper 40 attached to the outer tube 12, the engaging portion at the tip of the inner side 52 of the stopper 40 can be reliably engaged with the recessed portion 32 of the inner tube 30. By inserting the inner tube 30, the stopper 40 reliably functions to prevent it from coming off.

  In particular, since the inclined portions 46 of the stopper 40 are separated from each other toward the tip of the inclined portion 46, the curved portion 56 of the stopper 40 is prevented from stopping in the other end direction of the outer tube 12. The tube 12 can be positioned in the one end direction, and the engaging portion 58 can be always engaged with the recessed portion 32. Therefore, it is possible to prevent the engaging portion 58 from engaging with the recessed portion 32 of the inner tube 30 or to disengage the engaging portion 58 from the recessed portion 32 of the inner tube 30. Inconveniences such as the inner tube 30 inserted into the tube 12 coming off can be reliably prevented.

  Further, the bent portion 62 of the stopper 40 is curved, and a guide portion having an arcuate cross section protruding outward in the radial direction of the outer tube 12 is formed at the lower edge of the insertion hole 18 of the outer tube 12. When the stopper 40 is moved in a direction in which the other end of the 42 rides on the riding portion 22 of the projecting portion 14, the bent portion 62 of the stopper 40 corresponds to the curved surface on the side opposite to the one end side of the outer tube 12 of the guide portion. Therefore, if the other end of the outer side 42 of the stopper 40 is moved in the direction of riding on the riding portion 22 of the protruding portion 14 by using the curved surface and the curved shape of the bent portion 62, the bent portion 62 of the stopper 40 is used as it is. Can be smoothly pushed into the inner tube 30 side. As a result, the engaging portion 58 formed at the other end of the inner side 52 moves further away from the inner tube 30, so that the engaging portion 58 can be more reliably and easily raised from the recessed portion 32. The protrusion 24 can be detached.

  Further, since the protruding portion 14 is integrally formed with the outer tube 12 and the recessed portion 32 is continuously formed over the entire circumference of the inner tube 30, the stopper 40 is provided around the inner tube 30. At any position, it is possible to provide a function of preventing the inner tube 30 and the outer tube 12 from coming off. Therefore, the convenience of the piping retaining device 10 can be greatly improved.

  Next, FIGS. 13 and 14 show a piping retaining device 10 according to another embodiment of the present invention. The piping retaining device 10 has substantially the same configuration as that of the above-described embodiment. Hereinafter, different parts will be described. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. Here, in the structure of the first embodiment, the bent portion 62 of the stopper 40 is pressed against one end of the outer tube 12 so that the curved portion 56 of the stopper 40 is accommodated in the high protruding portion 24 and the engaging portion 58 is moved into the inner portion. Although the outer tube 12 is formed in a cylindrical shape with a metal plate, the engaging portion 58 of the stopper 40 cannot be visually recognized from the outside of the outer tube 12.

  Therefore, if the bent portion 62 is simply pressed against one end of the outer tube 12, the curved portion 56 is accommodated in the high protruding portion 24, and the engaging portion 58 of the inner side 52 is detached from the recessed portion 32 of the inner tube 30. It was hard to tell if it was. Therefore, as shown in FIGS. 13 and 14, the pipe retaining device 10 according to the second embodiment has an arcuate cross-section projecting outward in the radial direction of the outer tube 12 on the lower edge side of the insertion hole 18 of the outer tube 12. A guide portion 27 is formed. The guide portion 27 is formed with a radius of about 0.8R, a height of about 0.5 mm, and a width of about 5.0 mm, and is formed at the approximate center of the insertion hole 18 in the width direction.

  As shown in FIGS. 15 and 16, the insertion portion 18 side of the guide portion 27 is provided with a curved surface 27 </ b> A for contacting with the bent portion 62 of the stopper 40. The bent portion 62 of the stopper 40 corresponds to the curved surface 27A on the opposite side of the guide portion 27 from the one end side of the outer tube 12. Since the bent portion 62 of the stopper 40 corresponds to the curved surface 27A of the guide portion 27, the stopper 40 is moved in a direction in which the other end (inclined wall 26) of the outer side 42 rides on the riding portion 22 of the protruding portion 14. By doing so, the bent portion 62 of the stopper 40 can be smoothly pushed into the inner tube 30 side as it is due to the curved shape of the curved surface 27A and the bent portion 62.

  That is, in order to fit the curved portion 56 of the stopper 40 in the high projecting portion 24, the stopper 40 is moved in the direction in which the inclined wall 26 of the outer side 42 rides on the riding portion 22 of the projecting portion 14. As shown in FIG. 18, if the bent portion 62 of the stopper 40 is slid on the curved surface 27 </ b> A, the bent portion 62 of the stopper 40 can be pushed into the inner tube 30 side from the position shown by the dotted line in FIG. 18 as shown by the solid line.

  The stopper 40 prevents the outer tube 12 and the inner tube 30 from being pulled out in a state where the outer tube 12 and the inner tube 30 are connected to each other at the connecting portion (the bent portion 62 of the stopper 40 is connected to the curved surface 27A in FIG. 17). As shown by an arrow in FIG. 19, the outer tube 12 and the inner tube 30 move away from each other (from the state before sliding) (the inner tube 30 moves in the direction in which the inner tube 30 is pulled out from the outer tube 12). Then, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 comes into contact with the recessed portion 32 (engaging wall 34) of the inner tube 30. In this state, the projecting portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 are shifted from the corresponding state to the left and right (the O-ring insertion projecting portion 28 and the recessed portion 32 are shifted in a direction away from each other). ).

  As a result, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 is engaged in the recessed portion 32 of the inner tube 30, and the engaging side 48 of the outer side 42 enters the engaging hole 20, Engage with the edge of the engagement hole 20 of the low protrusion 16. That is, even in the outer tube 12 in which the guide portion 27 is formed at the lower edge of the insertion hole 18, the pulling out of the outer tube 12 and the inner tube 30 can be prevented by the stopper 40 as in the above-described embodiment.

  Thereby, the engaging portion 58 formed at the other end of the inner side 52 of the stopper 40 can be moved further away from the inner tube 30, so that the engaging portion 58 can be more reliably and easily removed from the recessed portion 32. Can be separated into the high protrusion 24. That is, the curved portion 56 can be accommodated in the high protruding portion 24 simply by pushing the bent portion 62 of the stopper 40 toward the inner tube 30 side from the curved surface 27A. Even if the portion 58 cannot be visually recognized, it can be surely grasped that the engaging portion 58 of the inner side 52 is disengaged from the inside of the recessed portion 32 of the inner tube 30.

  Also in the structure as in the first embodiment, the curved portion 56 of the stopper 40 can be easily and surely entered into the high protruding portion 14, so that the engaging portion formed at the other end of the inner side 52 of the stopper 40. 58 can be reliably detached from the recessed portion 32 into the high protruding portion 24. The curved surface 27A may be an inclined surface from the highest portion of the curved surface 27A to the lower edge of the insertion hole 18 as long as the bent portion 62 of the stopper 40 can be smoothly pushed into the inner tube 30 side.

  Thus, the stopper 40 is continuous with the curved bent portion 62 located on one end side of the outer side 42 and the inner side 52, and the radius of the outer tube 12 is provided at the lower edge of the insertion hole 18 of the outer tube 12. When the stopper 40 moves in a direction in which the other end of the outer side 42 rides on the riding portion 22 of the protruding portion 14, the bent portion 62 of the stopper 40 guides. Since it corresponds to the curved surface 27A opposite to one end side of the outer tube 12 of the portion 27, the other end of the outer side 42 of the stopper 40 is connected to the protruding portion 14 by utilizing the curved shape of the curved surface 27A and the bent portion 62. If it moves to the direction which rides on the climbing part 22, the bent part 62 of the stopper 40 can smoothly slide down the curved surface 27A toward the inner tube 30, and the bent part 62 can be pushed into the inner tube 30 side as it is. As a result, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 moves further away from the inner tube 30, so that the engaging portion 58 can be more reliably and easily protruded from the recessed portion 32. It can be separated into the part 24.

  On the other hand, since the insertion hole 18 opened on one end side of the low protrusion 16 is provided as described above, the strength of the outer tube 12 in the insertion hole 18 portion is weakened. Since the guide portion 27 having an arcuate cross section protruding outward in the radial direction of the outer tube 12 is formed on the lower edge side of the insertion hole 18, the strength of the insertion hole 18 portion of the outer tube 12 can be improved. Thereby, when the bent part 62 of the stopper 40 is moved in the direction of the inner tube 30 by sliding the curved surface 27A, it is possible to prevent the inconvenience that the outer tube 12 is recessed. Accordingly, the angle of the stopper 40 is changed by the recess of the outer tube 12, and the engaging portion 58 of the stopper 40 escapes from the recessed portion 32 (engagement wall 34) of the inner tube 30, so that it does not perform the function of preventing the pipe from coming off. It is possible to prevent inconveniences such as end.

  Next, FIGS. 20, 21, and 22 show a piping retaining device 10 according to another embodiment of the present invention. The piping retaining device 10 has substantially the same configuration as that of the above-described embodiment. Hereinafter, different parts will be described. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. The pipe retaining device 10 changes the protruding portion 14 integrally formed on the outer tube 12 and part of the stopper 40 with respect to the above embodiment, and pulls out the inner tube 30 from the outer tube 12. The strength of the stopper 40 in the direction is greatly improved.

  That is, as shown in FIGS. 20 and 21, the protruding portion 14 is provided with an engaging recess 64 (corresponding to the protruding portion side engaging portion of the present invention) instead of the engaging hole 20 of the previous embodiment. The engagement recess 64 is for releasing a riding protrusion 66 of the stopper 40 described later, and is formed by recessing a part of the low protrusion 16 constituting the protrusion 14 in the radial center direction of the outer tube 12. is doing. As shown in FIG. 22, the engaging recess 64 is recessed from a position slightly spaced from the insertion hole 18 opened on one end side of the low protrusion 16 to a predetermined dimension before the high protrusion 24, and is on the high protrusion 24 side. Is open. An engagement end 65 is formed on the lower edge of the opening (diameter central side of the outer tube 12) to engage with a through hole 61 of the stopper 40 described later.

  Further, as shown in FIGS. 23 and 24, the stopper 40 is provided with a riding protrusion 66 (corresponding to the protrusion of the present invention) instead of the engaging side 48 of the outer side 42 of the previous embodiment. The climbing protrusion 66 is recessed in a hemispherical shape on the inner side 52 side, and the periphery of the climbing protrusion 66 is provided in contact with the outer side 42. Specifically, the climbing protrusion 66 is formed so that the inclined state is extended from the inclined portion 46 to the apex of the hemispherical riding protrusion 66 in the same manner as the engaging side 48 and the inclined portion 46 of the previous embodiment. . In this case, the strength of the engaging side 48 portion of the previous embodiment is significantly improved by forming the riding protrusion 66 in a hemispherical shape.

  The stopper 40 is in a dotted line state (a state where the outer side 42 and the inner side 52 are close to each other) in a normal state, and in a state where the outer side 42 and the inner side 52 are separated (solid line in the drawing), The urging force is configured so that an elastic force works so that the inner side 52 and the outer side 42 are close to each other. In the normal state of the stopper 40, the riding protrusion 66 of the stopper 40 protrudes into the engaging recess 64. Further, the riding-up protrusion 66 may be the engaging side 48 of the previous embodiment. In this case, it is necessary to prevent the engaging side 48 from being deformed by providing a reinforcing rib (not shown) on the engaging side 48.

  Further, the inner side 52 of the stopper 40 is provided with a through hole 61 (corresponding to the second engagement portion of the present invention) that penetrates the inner side 52. The through hole 61 is formed in a substantially rectangular shape (length: about 7.3 mm, width: about 4.0 mm), and one edge 61 </ b> A is positioned substantially at the center of the curved portion 56 and extends therefrom. Thus, the other edge 61B is positioned in the vicinity of the bent portion 62 and is formed at the approximate center of the stopper 40 in the width direction.

  A reinforcing rib 68 is provided on the inner side 52 of the stopper 40. The reinforcing rib 68 is for preventing deformation of the bending portion 56 as shown in FIG. 25, and is formed from the bending portion 62 side of the bending portion 56 to the engaging portion 58. The reinforcing ribs 68 are provided by the concave portions 56 being recessed in the side surface direction opposite to the outer side 42, and the reinforcing ribs 68 are provided on both sides of the through holes 61. That is, the reinforcing ribs 68 are provided on both sides of the through hole 61 so that the bending portion 56 does not bend when the engaging portion 58 of the stopper 40 is pressed in the direction of the through hole 61. The reinforcing rib 68 is shown only in FIGS.

  Next, connection of pipes (inner pipe 30 and outer pipe 12) using the pipe retaining device 10 in this embodiment will be described with reference to FIGS. 26, 27, and 28. FIG. First, the stopper 40 is inserted into the outer tube 12. In this case, the stopper 40 is attached in such a manner that the engaging portion 58 is inserted into the insertion hole 18 formed in the side surface on the one end side of the low projecting portion 16 of the outer tube 12 as shown by the arrow in FIG. Then, the inner side main body 54 is inserted, and the stopper 40 is inserted into the protruding portion 14 of the outer tube 12. In this state, the climbing protrusion 66 on the outer side 42 gets over the low protrusion 16 and is inserted into the engagement recess 64.

  Next, as indicated by an arrow in FIG. 27, the other end of the inner tube 30 is inserted into the outer tube 12 from one end of the outer tube 12, and the outer tube is inserted into the positioning protrusion 36 provided on the inner tube 30. One end of 12 is brought into contact. In this state, as shown in FIG. 28, the protruding portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 correspond to each other, and the engaging portion 58 of the stopper 40 is connected to the inner tube. The outer tube 12 and the inner tube 30 are connected to each other through a connecting portion (one end portion of the outer tube 12 and the other end portion of the inner tube 30).

  In the inner tube 30, a recessed portion 32 is formed around the inner tube 30, and the protruding portion 14 formed on the outer tube 12 and the inner tube 30 are located at any position around the inner tube 30. The recessed part 32 formed in the periphery can be made to correspond. Thereby, the engaging portion 58 of the stopper 40 can be inserted into any position of the recessed portion 32 around the inner tube 30. Therefore, it is not necessary to rotate the inner tube 30 or the outer tube 12 to align the engaging portion 58 of the stopper 40, so that the connecting operation between the outer tube 12 and the inner tube 30 can be performed very easily. Become.

  In addition, in a state where the outer tube 12 and the inner tube 30 are connected by the connecting portion, the engaging recess 64 provided in the low protruding portion 16 of the protruding portion 14 is inserted into the through hole 61 provided in the inner side 52. It becomes a state. From this state, when the stopper 40 is moved to the O-ring insertion protrusion 28 side, the riding protrusion 66 rides on the riding part 22 of the protrusion 14, and the inner side 52 and the outer side 42 are separated from each other. That is, when the inner side 52 and the outer side 42 are separated from each other, the stopper 40 brings the inner side 52 and the outer side 42 close to each other by a biasing force. Accordingly, the stopper 40 (the riding protrusion 66) is configured not to ride on the riding portion 22.

  Then, in a state where the outer tube 12 and the inner tube 30 are connected at the connecting portion, the outer tube 12 and the inner tube 30 move away from each other as indicated by arrows in FIG. When the inner tube 30 is moved in the direction of pulling out 30, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 comes into contact with the recessed portion 32 (engaging wall 34) of the inner tube 30. In this state, the projecting portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 are shifted from the corresponding state to the left and right (the O-ring insertion projecting portion 28 and the recessed portion 32 are shifted in a direction away from each other). ).

  In this case, the engaging portion 58 at the other end of the inner side 52 of the stopper 40 engages in the recessed portion 32 of the inner tube 30, and the engaging recess 64 (engaging end portion 65) of the protruding portion 14 of the outer tube 12. It enters the through hole 61 of the inner side 52. Specifically, when the outer tube 12 and the inner tube 30 move away from each other, the inner tube 30 (the engaging wall 34 of the recessed portion 32) causes the engaging portion 58 at the distal end of the curved portion 56 to be bent and the bent portion 62 of the stopper 40. The outer tube 12 (the engagement end portion 65 of the engagement recess 64) pushes one edge 61 </ b> A of the through hole 61 toward the engagement portion 58. As a result, the inner tube 30 and the outer side 42 are stretched at the curved portion 56 portion of the stopper 40 and are prevented from being pulled out. In this case, since the stopper 40 is provided with the reinforcing rib 68 on the bending portion 56, the bending of the bending portion 56 is prevented and the inner tube 30 and the outer side 42 are deformed by the deformation of the bending portion 56. Pulling out can be reliably prevented.

  The engaging end portion 65 is formed at an acute angle toward the high protruding portion 24 side, and the lower end of the engaging wall 34 of the inner tube 30 recessed portion 32 (diameter center side of the inner tube 30) is separated from the positioning protrusion 36. It can be tilted in the direction. In this case, when the outer tube 12 and the inner tube 30 are moved in the direction in which the outer tube 12 and the inner tube 30 are pulled out while the stopper 40 prevents the outer tube 12 and the inner tube 30 from being pulled out, one edge 61A of the through hole 61 is engaged. Since the engagement portion 58 at the distal end of the bending portion 56 is urged toward the riding portion 22 side of the joint end portion 65, the engagement wall 34 is urged toward the lower end of the engagement wall 34 (diameter center side of the inner tube 30). The engagement end portion 65 and the through hole 61 (one edge 61A) of the stopper 40, the lower end of the engagement wall 34 of the inner tube 30 recessed portion 32, and the engagement portion 58 of the stopper 40 can be made difficult to come off.

  Next, how to remove the inner tube 30 from the outer tube 12 from the state where the outer tube 12 and the inner tube 30 are prevented from being pulled out by the engagement of the stopper 40 will be described with reference to FIG. First, as shown in FIG. 30, one end of the outer tube 12 is brought into contact with the positioning projection 36 of the inner tube 30, and the protruding portion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30. To correspond. In this state, the inner side 52 and the outer side 42 are moved by pushing the stopper 40 in which the elastic force is acting in the proximity direction to the O-ring insertion protrusion 28. When the positioning projection 36 is not provided on the inner tube 30, the protrusion 14 formed on the outer tube 12 and the recessed portion 32 formed on the inner tube 30 may be made to correspond to each other.

  Specifically, when the stopper 40 is pushed and moved in the direction of the O-ring insertion protrusion 28, the riding protrusion 66 comes into contact with the riding part 22, and further, the stopper 40 is moved in the direction of the O-ring insertion protrusion 28. When going, the riding protrusion 66 of the stopper 40, which has an elastic force acting so as to sandwich the outer tube 12 (plate thickness), rides on the riding part 22 while being in contact with the riding part 22. At this time, the bending portion 56 is in contact with the inner surface of the inclined wall 26 (corresponding to contact with the inner surface of the wall on the one end side of the outer tube 12 of the present invention) and in the direction of the O-ring insertion protrusion 28 (specifically, the high protrusion) The portion 24 moves in the most protruding direction.

  When the bent portion 62 of the stopper 40 is pressed against one end of the outer tube 12, the riding protrusion 66 of the stopper 40 rides on the riding portion 22, and the bending portion 56 is the most of the inclined wall 26 by the elastic force of the stopper 40. It is located in a protruding portion (high protruding portion 24) or in the vicinity of the high protruding portion 24. As a result, the inclined portion 46 is separated from the recessed portion 32 toward the outer tube 12 and is positioned and accommodated in the high protruding portion 24 of the protruding portion 14. That is, the bent portion 62 of the stopper 40 as described above is pushed into the inner tube 30 side from the curved surface 27A, so that the bent portion 56 can be accommodated in the high projecting portion 24. Even if the engaging portion 58 is not visible, it can be surely grasped that the engaging portion 58 of the inner side 52 has been detached from the recessed portion 32 of the inner tube 30.

  If the inner tube 30 is separated from the outer tube 12 in this state, the engaging portion 58 of the stopper 40 can be pulled out without being caught by the recessed portion 32 (engaging wall 34) of the inner tube 30. That is, when the inner tube 30 is pulled out from the outer tube 12, the stopper 40 is moved in the direction of the O-ring insertion protrusion 28, and the bent portion 62 of the stopper 40 is pressed against one end of the outer tube 12. Since 56 is accommodated in the high protrusion 24, the engaging portion 58 of the stopper 40 can be easily detached from the recessed portion 32 of the inner tube 30. If the inner tube 30 is separated from the outer tube 12 in this state, the inner tube 30 can be easily moved from the outer tube 12 without the engaging portion 58 being caught by the recessed portion 32 (engagement wall 34). Can be pulled out.

  As described above, when the inner tube 30 moves in the direction in which the inner tube 30 is pulled out from the outer tube 12, the engaging recess 64 of the projecting portion 14 can enter and engage with the through hole 61 of the stopper 40. Therefore, the dimension of the stopper 40 between the engaging recess 64 and the through hole 61 is set to the dimension from the engaging side 48 of the outer side 42 to the engaging part 58 at the end of the inner side 52 through the bent portion 62 in all the embodiments. Can be made extremely short. Thereby, the intensity | strength of the stopper 40 of the direction which pulls out the inner pipe | tube 30 from the outer pipe | tube 12 can be improved significantly. Therefore, it is possible to surely prevent such a problem that the stopper 40 is deformed and the inner tube 30 inserted into the outer tube 12 is pulled out.

  Further, the stopper 40 is formed on an inclined portion 46 whose front end side is inclined in a direction away from the inner side 52 and an outer side 42 on the bent portion 62 side of the inclined portion 46, and a riding protrusion that protrudes toward the inner side 52 side. When the stopper 40 is moved in a direction in which the riding protrusion 66 rides on the riding part 22 of the protrusion 14, the distance between the inner side 52 and the outer side 42 of the stopper 40 can be increased. It becomes possible. Thereby, the urging | biasing force which the inner side 52 and the outer side 42 which were spaced apart narrow can be enlarged further. In this case, it is possible to prevent the curved portion 56 of the stopper 40 from stopping in the direction of the other end of the outer tube 12, and to be surely positioned in the direction of one end of the outer tube 12. It is possible to prevent the portion 58 from engaging with the recessed portion 32 of the inner tube 30 or the engagement portion 58 from being detached from the recessed portion 32 of the inner tube 30. Thereby, inconveniences such as the inner tube 30 inserted into the outer tube 12 coming off can be reliably prevented.

  The stopper 40 is formed at the other end portion of the inner side 52, has a curved portion 56 that is curved toward the outer side 42 and has a distal end serving as an engaging portion 58, and the through hole 61 of the stopper 40 has a curved portion 56. It extends to the surface of the bent portion 62 side. Further, since the reinforcing rib 68 is recessed in the opposite direction to the outer side 42 on the surface opposite to the outer side 42 of the curved part 56 located on both sides of the through hole 61, the deformation stress of the curved part 56 is reduced. Can be greatly improved. Accordingly, it is possible to prevent the inconvenience that the bending portion 56 of the stopper 40 is deformed when a force in the pulling direction is applied to the inner tube 30 and the outer tube 12. Therefore, it is possible to reliably prevent the inner tube 30 inserted into the outer tube 12 from being pulled out. In addition, the same effects as those of the first and second embodiments can be obtained.

  In the embodiment, the shape, size, or angle of the pipe retaining device 10 is described. However, even if the shape, dimension, angle, or the like is changed without departing from the gist of the pipe retaining device 10. Needless to say, it is good. Of course, the present invention is not limited to the above-described embodiments, and the present invention is effective even when various other modifications are made without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pipe (showing a state where an inner pipe is inserted into an outer pipe) provided with a pipe retaining device according to an embodiment of the present invention (Example 1). It is a perspective view of an outer pipe which shows the state where a stopper is inserted in the projection part formed in the outer pipe. It is a front view of the stopper which comprises the piping prevention device of this invention. FIG. 4 is a side view of a stopper constituting the piping retaining device of FIG. 3. FIG. 4 is a rear view of a stopper constituting the piping retaining device of FIG. 3. It is a vertical side view of piping (an inner pipe and an outer side) which shows the state where the stopper was attached and the inner pipe was inserted in the outer pipe. It is a principal part enlarged view of the state which the stopper of FIG. 6 was attached and the inner pipe was inserted in the outer pipe. The engaging portion of the stopper engages with the recessed portion on the inner side, and the engaging side on the outer side enters and engages with the engaging hole, thereby preventing the inner tube from being pulled out from the outer tube. It is a figure which shows a state. It is explanatory drawing of a stopper. It is a figure which shows the state (state in which the engaging part of the stopper detach | leaved from the recessed part of the inner side) from which an inner pipe is pulled out from the outer pipe | tube. It is explanatory drawing of piping prevention when the outer side and inner side of a stopper are parallel in the state inserted until the engagement part of the bending part tip was removed from the recessed part of an inner pipe. In the state where the engagement portion at the distal end of the bending portion is inserted until the engagement portion is disengaged from the recessed portion of the inner tube, the piping is prevented from coming off when the outer side and the inner side of the stopper are expanded. is there. (Example 2) which is the perspective view of the piping (The state in which an inner tube is inserted in an outer tube | pipe) which comprises the piping retainer which shows other one Example of this invention. It is a cross-sectional view (enlarged view) of the main part of the outer pipe constituting the pipe retaining device showing another embodiment of the present invention. It is a top view (enlarged view) of the principal part of the outer pipe which comprises the piping retainer which shows another one Example of this invention. It is a vertical side view (enlarged view) of the principal part of the outer pipe which comprises the piping retainer which shows another one Example of this invention. It is a figure which slides the bent part of a stopper on the curved surface provided in the inner pipe, pushes the bent part of the stopper into the inner pipe side, and stores the curved part formed in the outer side of the stopper in the high protruding part. It is explanatory drawing in the case of pushing in the bending part of a stopper to the inner pipe side, and making the engaging part formed in the outer side of a stopper detach | leave smoothly from the inside of the recessed part of an inner pipe. The engaging portion of the stopper engages with the recessed portion on the inner side, and the engaging side on the outer side enters and engages with the engaging hole, thereby preventing the inner tube from being pulled out from the outer tube. It is a figure which shows a state. (Example 3) which is a top view (enlarged view) of the principal part of the outer tube which comprises the piping retainer which shows other one Example of this invention. It is a cross-sectional view (enlarged view) of the main part of the outer pipe constituting the pipe retaining device showing another embodiment of the present invention. It is a vertical side view (enlarged view) of the principal part of the outer pipe which comprises the piping retainer which shows another one Example of this invention. It is a front view of the stopper which comprises the piping prevention device of this invention. FIG. 4 is a side view of a stopper constituting the piping retaining device of FIG. 3. FIG. 4 is a rear view of a stopper constituting the piping retaining device of FIG. 3. It is a perspective view of an outer pipe which shows the state where a stopper is inserted in the projection part formed in the outer pipe. It is a perspective view of piping (showing the state where an inner pipe is inserted in an outer pipe) provided with a piping retaining device which shows other examples of the present invention. It is a vertical side view of piping (an inner pipe and an outer side) which shows the state where the stopper was attached and the inner pipe was inserted in the outer pipe. The engaging portion of the stopper is engaged with the recessed portion on the inner side, and the engaging concave portion of the protruding portion of the outer tube is engaged with the through hole on the outer side to prevent the inner tube from being pulled out from the outer tube. FIG. It is a figure which shows the state (state in which the engaging part of the stopper detach | leaved from the recessed part of the inner side) from which an inner pipe is pulled out from the outer pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piping prevention device 12 Outer pipe 14 Protrusion part 16 Low protrusion part 18 Insertion hole 20 Engagement hole (projection part side engagement part)
DESCRIPTION OF SYMBOLS 22 Riding part 24 High protrusion part 26 Inclined wall 27 Guide part 27A Curved surface 28 O-ring insertion protrusion 30 Inner pipe 32 Recessed part 34 Engagement wall 36 Positioning protrusion 40 Stopper 42 Outer side 44 Outer side main body 46 Inclined part 48 Engagement Edge (second engaging part)
52 Inner side 54 Inner side main body 56 Bending part 58 Engaging part (first engaging part)
60 Through hole (second engaging portion)
61 Through hole (second engaging portion)
61A One edge 61B The other edge 62 Bent part 64 Engaging recess (projecting part side engaging part)
65 Engagement end 66 Riding protrusion 68 Reinforcement rib

Claims (8)

An outer tube, an inner tube that is inserted into the outer tube from one end of the outer tube, a protrusion that is configured near one end of the outer tube and protrudes radially outward of the outer tube, and the inner tube A recessed portion formed at an end portion on the side to be inserted into the outer tube and recessed inward in the radial direction of the inner tube; and a stopper having elasticity attached to the outer tube corresponding to the protruding portion;
The protruding portion includes a low protruding portion, an insertion hole formed in a side surface of the low protruding portion on one end side of the outer tube, and a high protruding portion continuous on the side of the low protruding portion opposite to the one end side of the outer tube. And a projecting portion side engaging portion formed in the low projecting portion, and a riding portion that is located on the high projecting portion side of the projecting portion side engaging portion and projects higher than the low projecting portion,
The stopper includes an outer side, an inner side continuously folded at a bent portion at one end of the outer side, a first engaging portion configured at the other end of the inner side, and the first engagement. A second engaging portion formed on the bent portion side with respect to the joint portion, and the inner side enters the protruding portion from the insertion hole of the protruding portion, and the outer side and the inner side Is attached to the outer tube with the protruding portion sandwiched therebetween,
When the inner tube moves in a direction in which the inner tube is pulled out from the outer tube, the first engaging portion at the other end of the inner side of the stopper engages with the recessed portion of the inner tube, and the second The engagement portion is engaged with the projecting portion side engaging portion of the projecting portion, so that the withdrawal is prevented,
When the stopper is moved in a direction in which the other end of the outer side rides on the riding part of the projecting part in a state where the recessed part of the inner tube corresponds to the high projecting part of the projecting part, the inner side of the stopper The piping retaining device, wherein the first engaging portion at the other end is separated from the recessed portion of the inner tube. The protrusion-side engagement portion of the protrusion is an engagement hole formed on the upper surface of the low protrusion,
The second engaging portion of the stopper is an engaging side that protrudes inward from the outer side,
The engagement side of the stopper enters the engagement hole of the projecting portion and engages when the inner tube moves in a direction in which the inner tube is pulled out from the outer tube. Detaching device for piping as described. The stopper is formed at the other end of the outer side, the tip side is inclined in a direction away from the inner side, and is formed at the other end of the inner side, and is curved toward the outer side. A distal end has a curved portion serving as the first engaging portion;
When the stopper is moved in a direction in which the inclined portion rides on the riding portion of the projecting portion, the curved portion comes into contact with the inner surface of the wall on the one end side of the outer tube of the high projecting portion. Entering, the first engaging portion is disengaged from the recessed portion,
3. The piping retaining device according to claim 2, wherein the wall on the one end side of the outer pipe of the high protruding portion and the inclined portion of the stopper are separated from each other toward the tip of the inclined portion. The protruding portion side engaging portion of the protruding portion is an engaging recess formed as a recess in the low protruding portion,
The second engaging portion of the stopper is a through hole formed in the inner side,
2. The engagement recess of the protrusion enters the through hole of the stopper and engages when the inner tube moves in a direction in which the inner tube is pulled out from the outer tube. Piping prevention device.   The stopper is formed at the other end portion of the outer side, and is formed at an inclined portion whose tip side is inclined in a direction away from the inner side, and an outer side on the bent portion side of the inclined portion, and the inner side 5. The piping retaining device according to claim 4, further comprising: a projecting portion projecting into the pipe.   The stopper is formed at the other end portion of the inner side, has a curved portion that is curved toward the outer side and has a tip that becomes the first engaging portion, and the through hole of the stopper is formed on the curved portion. The reinforcing rib is formed on a surface on the opposite side to the outer side of the curved portion that extends to the surface on the bent portion side and is located on both sides of the through hole. The piping retaining device according to claim 4 or 5.   The bent portion of the stopper is curved, and a guide portion having an arcuate cross section protruding outward in the radial direction of the outer tube is formed at the lower edge of the insertion hole of the outer tube, and the other end of the outer side is The bent portion of the stopper corresponds to a curved surface opposite to one end side of the outer tube of the guide portion when the stopper is moved in a direction to ride on the riding portion of the protruding portion. The piping retaining device according to any one of claims 1 to 6.   The projecting portion is formed so as to project integrally with the outer tube, and the recessed portion is formed continuously over the entire circumference of the inner tube. The piping retaining device according to any one of the above.

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