JP4217809B2 - Pipe connection structure and pipe joint - Google Patents

Description

  The present invention relates to a structure and a pipe joint of a pipe connection part between a corrugated pipe and a pipe joint or other various pipe materials having convex parts and concave parts alternately in the pipe axis direction.

  Conventionally, in addition to protective pipes that house and protect cables such as electric cables and optical fiber cables, corrugated pipes made of synthetic resin with excellent pressure-resistant flatness, in which the pipe wall is formed into an uneven corrugated shape, are widely used as water pipes and sewage pipes. in use.

  Among such corrugated pipes, in particular, by using a corrugated pipe in which the cross section in the pipe radial direction of the convex portion is formed in a substantially square shape, for example, as disclosed in Patent Document 1, stable piping with less twist In the case where a plurality of pipes are converged in parallel to form a porous pipe line, the parallelism and the straightness can be favorably maintained.

  When this type of corrugated pipe is piped, for example, corrugated pipes are connected to each other via a pipe joint so that a plurality of corrugated pipes are successively added. As a pipe joint for connecting such corrugated pipes, a joint body disclosed in Patent Document 1 (see FIGS. 4 and 5) is formed into a tubular shape, or disclosed in Patent Document 2. There exists what comprised such a coupling main body by a pair of semi-cylindrical member.

JP-A-8-219333 JP 2000-337573 A

  However, in the connection structure using the pipe joint disclosed in FIG. 4 of Patent Document 1, the corrugated pipe end portion on which the packing is fitted is merely inserted into the joint body of the pipe joint, When a strong pulling force acts on the corrugated pipe, the corrugated pipe may come out from the joint body of the pipe joint.

  Further, in the connection structure using the pipe joint disclosed in FIG. 5 of Patent Document 1, a movement prevention pin is inserted from the outside of the joint body of the pipe joint to prevent the corrugated pipe inserted into the joint body from coming off. However, in this case, after the corrugated tube is inserted into the joint body, there is a problem in that it is necessary to insert a pin and the connection operation becomes complicated. In addition, when the pin is inserted from the outside of the joint body, the head of the pin protrudes from the outer peripheral surface of the pipe joint, which interferes with converging the corrugated pipe, and hinders the formation of the porous pipe as described above. It will be. Further, instead of the pin, for example, an engagement member may be provided on the inner peripheral surface side of the joint main body, and this engagement member may be engaged with the convex portion of the corrugated tube to prevent the corrugated tube from coming off. However, simply providing the engagement member on the joint body causes the outer shape of the joint body to become larger and project outward from the convex portion of the corrugated tube, or cause the outer surface of the joint body to protrude. This interferes with converging the corrugated tube, and still impedes the formation of the porous tube as described above.

  Furthermore, in the connection structure using the pipe joint disclosed in Patent Document 2, a pair of semi-cylindrical members are put on the portion where the concave portions of the corrugated pipes are abutted with each other, so that these semi-cylindrical members are projected on the corrugated pipe. Although it does not interfere with the formation of the perforated pipe line, it is necessary to work by tightening these semi-cylindrical members with bolts and connecting them. There was a problem that became complicated.

  The present invention eliminates the above-mentioned problems, can surely prevent the corrugated tube from coming off, can simplify the connection work, and can interfere with the formation of the porous pipe line. Therefore, an object of the present invention is to provide a structure of a pipe connection portion and a pipe joint that can suppress the outward protrusion of the corrugated pipe from the convex portion as much as possible.

  In order to solve the above-described problems, in the structure of the pipe connecting portion according to the present invention, at least one of the pipes connected to each other has, for example, an annular convex portion and a concave portion alternately in the tube axis direction. The fitting tube is made of a synthetic resin corrugated tube having a substantially square cross section in the tube diameter direction, and the corrugated tube end portion of the other synthetic resin tube material has a substantially square cross section in the tube diameter direction. These are connected to each other, and the amount of overhang in the inward direction gradually increases as the distance from the insertion port of the fitting tube portion increases, on the inner wall surface of the fitting tube portion, By providing a latching piece made of a thin rigid material such as a metal plate having elasticity in the inner and outer directions, and pushing the latching piece outward against the elastic force by the convex part of the corrugated tube end And allowing the corrugated tube end to be inserted into the fitting tube, The latching piece is fitted into the gap between adjacent convex portions of the corrugated tube end portion inserted into the fitting cylinder portion by its elastic return force, and the tip of the latching piece is the above-mentioned convex portion The corrugated tube end portion is prevented from coming off from the fitting tube portion by being brought into contact with the convex portion far from the insertion port.

Specifically, the urging piece extending from the latching piece is brought into contact with the inner wall surface of the fitting tube portion to hold the projecting state of the latching piece inward and outward. The hooking piece that has been spread out is urged inward. Further, the hooking piece extends from a base piece provided along the inner wall surface of the fitting tube portion, and the base piece is fitted by the convex portion of the corrugated tube end portion inserted into the fitting tube portion. By pressing against the inner wall surface of the joint tube portion, the state of the hooking piece protruding inward is maintained. Furthermore, an acute-angled biting nail that bites into the convex portion is formed at the tip of the latching piece.

  Still further, the stopper piece extending from the latching piece is folded back along the outer wall surface of the fitting cylinder part through the fitting cylinder part, and the latching piece is inside the fitting cylinder part. It is intended to be mounted on the wall.

  Further, the inner wall surface of the fitting tube portion is gradually spread outward by the convex portion of the corrugated tube end portion in the middle of insertion, and between the adjacent convex portions of the corrugated tube end portion when the insertion is completed. A protrusion that fits into the gap is formed. Further, a pair of latching pieces are provided on the inner wall surface of the fitting cylinder portion so as to face each other.

  Further, the other pipe material is a pipe joint provided with the fitting tube portions at both ends thereof, and the corrugated tube end portions are respectively inserted into the fitting tube portions so that the ends of the pair of corrugated tubes are connected to each other. Are to be linked.

  Furthermore, the other pipe material is a pipe joint provided with the fitting cylinder part at one end thereof and a connection cylinder part at the other end, and inserting the corrugated pipe end part into the fitting cylinder part, The end of the corrugated tube and the end of the dissimilar tube are connected to each other by connecting the end of the dissimilar tube having a shape different from that of the corrugated tube to the connecting tube portion.

  The pipe joint of the present invention has, for example, an end of a corrugated pipe made of a synthetic resin having annular convex portions and concave portions alternately in the tube axis direction, and a cross section in the pipe radial direction of the convex portion being formed in a substantially rectangular shape. Pipe joints made of synthetic resin that connect the sections, and at both ends of the joint body, fitting tube sections having a substantially square cross section in the pipe radial direction into which the corrugated pipe end sections are inserted are respectively formed. A latching piece made of a thin-walled rigid material such as a metal plate having elasticity in the inner and outer directions while gradually increasing inward as the distance from the insertion port of the fitting cylinder part increases on the inner wall surface of the fitting cylinder part And extending the hooking piece outwardly against the elastic force by the convex portion of the corrugated tube end, thereby allowing the corrugated tube end to be inserted into the fitting tube portion. The hooking piece is inserted into a gap between adjacent convex portions of the corrugated tube end inserted into the fitting tube portion. From the fitting tube portion at the end of the corrugated tube, it is fitted by elastic return force and the tip of the latching piece is brought into contact with the convex portion on the side farther from the insertion port among the adjacent convex portions. It is characterized by preventing the omission.

Specifically, the urging piece extending from the latching piece is brought into contact with the inner wall surface of the fitting tube portion to hold the projecting state of the latching piece inward and outward. The hooking piece that has been spread out is urged inward. Further, the hooking piece extends from a base piece provided along the inner wall surface of the fitting tube portion, and the base piece is fitted by the convex portion of the corrugated tube end portion inserted into the fitting tube portion. By pressing against the inner wall surface of the combined cylinder portion, the inwardly protruding state of the hooking piece is maintained. Furthermore, the joint body includes a connecting portion that connects the fitting tube portions, and the connecting portion has a substantially circular cross section in the tube diameter direction, and is smaller than the outer peripheral shape of the fitting tube portion. It has a perimeter shape. In addition, a concave portion having a substantially circular cross section in the radial direction of the corrugated tube can be inserted into the connecting portion.

  Another aspect of the present invention provides a pipe joint in which the fitting tube portion is formed at one end of the joint body, and a connecting tube portion that connects an end portion of a different type pipe different from the corrugated tube to the other end of the joint body. The end portion of the corrugated tube is connected to the end portion of the dissimilar tube.

  According to the present invention, simply by inserting the end of the corrugated tube into the fitting tube portion, the latching piece provided on the inner wall surface of the fitting tube portion engages with the convex portion of the corrugated tube, so that the corrugated tube can be removed. In a prevented state, the corrugated tube and the pipe joint can be easily connected.

  Moreover, since the latching piece made of a thin-walled rigid material such as a metal plate is used, the latching piece can be prevented from coming off by increasing the strength of the latching piece, and the latching piece in the fitting cylinder portion. The space for providing the inner tube is narrowed in the inner and outer directions, and the amount of the projecting tube portion protruding outward can be suppressed as much as possible, and when a plurality of corrugated tubes are converged in parallel to form a porous pipe line It is possible not to cause any trouble.

  Also, a biasing piece that biases the latching piece inward, a base piece that keeps the latching piece protruding inward, or a biting claw at the tip of the latching piece The latching piece that has been spread out can be surely returned and engaged with the convex part, and the corrugated tube can be prevented from coming off more reliably. .

  Furthermore, by attaching the latching piece to the inner wall surface of the fitting cylinder part with the stopper piece extending from the latching piece, the mounting structure can be simplified and the installation work can be done easily. .

  Furthermore, when the corrugated tube is completely inserted, the projection formed on the inner wall surface of the fitting tube portion is fitted into the gap between the convex portions, so that the corrugated tube is completely inserted from the collision sound generated at this time. It is possible to know and prevent defective insertion.

  In addition, the fitting tube parts are connected by a connecting part having a smaller outer circumference than these, and by using a pipe joint that has a constricted part in the center part, the strength of the pipe joint is increased, and more stable. Connection can be realized. Further, by inserting the concave portion of the corrugated tube into this connecting portion, the corrugated tube can be firmly positioned in the fitting tube portion.

  Further, by using a pipe joint provided with a fitting cylinder part and a connection cylinder part, it is possible to connect the corrugated pipe and the dissimilar pipe with one pipe joint without using a dedicated part for connecting the dissimilar pipe. As a result, usability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an exploded structure of a pipe connection portion using a pipe joint according to an embodiment of the present invention.

  In the figure, (1) is a corrugated tube made of synthetic resin formed by, for example, blow molding. This corrugated pipe (1) is provided with a pipe wall (4) having annular uneven parts (2) and (3) alternately in the pipe axis direction, and the cross section of the convex part (2) in the pipe radial direction is substantially square. The section of the concave portion (3) in the tube diameter direction is formed in a substantially circular shape. And cables, such as an electric wire cable and an optical fiber cable, are accommodated in the inside of a pipe wall (4).

  (10) is a synthetic resin pipe joint formed by, for example, blow molding. As shown in FIG. 2, the pipe joint (10) includes a pair of fitting tube portions (11) and (11) into which end portions of the corrugated tubes (1) and (1) are inserted, and these fitting tube portions (11). A joint main body (13) including a connecting portion (12) for connecting (11) is provided.

  The fitting tube portion (11) is formed in a substantially square cross section in the tube diameter direction, and the length of one side of the inner periphery thereof is longer than the length of one side of the outer periphery of the convex portion (2) of the corrugated tube (1). Is slightly longer. Also, a flange for holding the shape of the insertion port (14) around the insertion port (14) of the fitting tube portion (11) and facilitating insertion of the end portion of the corrugated tube (1). (15) is formed in an expanded state.

  As shown in FIGS. 3 and 4, the fitting tube portion (11) is recessed by inserting a substantially central portion of one of the four side walls (18), (18). A protrusion (19) is formed on the inner wall surface. This protrusion (19) is connected to the inclined surface (19a) where the amount of overhang gradually increases in the inward direction (direction approaching the central axis of the cylinder portion) as it moves away from the insertion port (14), and to the inclined surface (19a). The curved surface (19b) corresponding to the shape of the corner | angular part which has the roundness of the convex part (2) on the part (12) side is provided. The protrusion (19) is not only provided on one side wall (18), but also, for example, the opposing side walls (18) and (18), the orthogonal side walls (18) and (18), and three or four side walls ( 18) (18) may be provided respectively.

  Further, a pair of retaining members (20), (20) for preventing the corrugated tube (1) inserted into the fitting tube portion (11) from coming off face each other on the inner wall surface of the fitting tube portion (11). Is provided.

  The retaining member (20) is formed by punching and bending a metal plate as a thin-walled rigid material. As shown in FIGS. 3 and 4, the fitting member (20) From the base piece (21) along the wall surface, the hook piece (22) extending from the end of the base piece (21) on the connecting portion (12) side, and the intermediate portion of the hook piece (22) The urging piece (23) extends and a pair of stop pieces (24) and (24) extended from the end of the hook piece (22) on the insertion port (14) side.

  The latch piece (22) has a flat plate shape with the inner and outer surfaces being flat, and the amount of protrusion in the inward direction gradually increases as the distance from the insertion port (14) increases. It has elasticity in the separating direction) and functions as a leaf spring. In addition, a pair of acute-angled biting nails (25) and (25) are formed at the end of the hooking piece (22) on the side of the connecting portion (12), that is, the tip. These biting claws (25) and (25) are formed at both ends of the tip, respectively. For example, only one bit is provided at the center of the tip, or is formed in a saw blade shape over the entire tip. You may make it do.

  The urging piece (23) is formed so as to protrude from the side on the base piece (21) side of the central opening by cutting and raising the substantially central part of the latching piece (22). That is, as shown in FIG. 3, the middle of the latching piece (22) is branched in a V shape to form the urging piece (23). The urging piece (23) gradually increases in the outward amount (in the direction away from the central axis of the cylindrical portion) as it moves away from the insertion port (14), and its tip is the fitting cylindrical portion (11). While being in contact with the inner wall surface, it has elasticity in the inner and outer directions and functions as a leaf spring. That is, even when attachment of the retaining member (20) by the stopper pieces (24) and (24) is unstable, the tip of the urging piece (23) is in contact with the inner wall surface of the fitting cylinder portion (11). When the latching piece (22) is held in an inwardly projecting state in the fitting cylinder (11), and when the latching piece (22) is pushed outward, By the repulsive force caused by pushing the inner wall surface of (11), the latching piece (22) is urged inward to assist the elastic return of the latching piece (22).

  As shown in FIGS. 3 and 5, the stopper pieces (24) and (24) are formed by cutting up the vicinity of the left and right ends of the base piece (21), so For example, it is formed in a narrow band shape. These stopper pieces (24) and (24) pass through the through holes (26) and (26) formed in the side wall (18) of the fitting tube portion (11) and are formed on the outer wall surface of the fitting tube portion (11). The retaining member (20) is attached to the inner wall surface of the fitting tube portion (11).

  As described above, the retaining member (20) is made of a thin metal plate, and is attached so as to be substantially along the side wall (18) of the fitting tube portion (11) as a whole. Therefore, in the fitting cylinder portion (11) provided with such retaining members (20) and (20), the space for providing the retaining members (20) and (20) is narrowed in the inner and outer directions, and the The outer peripheral shape can be kept small.

  One of the pair of retaining members (20) and (20) is provided so that the retaining piece (22) covers the inclined surface (19a) of the protrusion (19). The mounting position of the members (20) and (20) is not limited to this, for example, the side walls (18) and (18) where the protrusions (19) are not formed on both the retaining members (20) and (20). You may make it provide in. Also, the number of retaining members (20) may be set to one for each fitting cylinder (11), or three or more for each fitting cylinder (11). May be.

  The connecting part (12) has a substantially circular cross section in the tube diameter direction, and its outer peripheral shape is smaller than the outer peripheral shape of the fitting tube part (11). Further, the inner diameter of the connecting portion (12) is slightly longer than the outer diameter of the concave portion (3) of the corrugated tube (1), and the concave portion (3) of the corrugated tube (1) can be inserted into the connecting portion (12). It can be done. Therefore, in the pipe joint (10), the fitting cylinder (11) (11) is formed at both ends of the joint body (13), and these are connected by the connecting portion (12), so that the center The part is constricted to increase the strength.

  Next, the connection between the ends of the corrugated pipes (1) and (1) using the pipe joint (10) will be described.

  First, the end of one corrugated pipe (1) is inserted into the insertion port (14) of one fitting cylinder (11) in the pipe joint (10). At this time, as shown in FIG. 6, the convex portion (2) of the corrugated tube (1) moves while abutting against the retaining pieces (22) and (22) of the retaining members (20) and (20). These engaging pieces (22) and (22) are expanded outwardly against the elastic force and the urging force of the urging pieces (23) and (23) to fit the end of the corrugated tube (1). Allow insertion into the tube (11). At the same time, the convex portion (2) of the corrugated tube (1) gradually spreads the protrusion (19) of the fitting tube portion (11) outward, and the inner wall surface of the fitting tube portion (11) becomes Expand outward.

  Then, as shown in FIG. 7, the convex portion (2) of the corrugated tube (1) passes through the latching pieces (22), (22) and the protrusion (19), and the fitting cylinder portion in the joint body (13). (11) abuts on the step surface (30) between the connecting portion (12) and the tip recess (3) of the corrugated pipe (1) fits into the connecting portion (12) of the pipe joint (10). The insertion of the end of the corrugated tube (1) is completed.

  At this time, the latching pieces (22) and (22) are elastically restored by their own elastic force and the urging force of the urging pieces (23) and (23), and the base piece (21) is fitted by the convex portion (2). By being pressed against the inner wall surface of the cylindrical portion (11), the latching pieces (22) and (22) are prevented from rattling and the protruding state in the inward direction is maintained. As a result, the latching pieces (22) and (22) fit into the gaps between the adjacent convex portions (2) and (2) at the end of the corrugated tube (1), and the latching pieces (22) and (22) The biting claws (25), (25)... At the tip end bite into the convex portion (2) on the side farther from the insertion port (14) among the adjacent convex portions (2) (2). Specifically, it bites into the side surface of the convex portion (2) protruding in the tube diameter direction. This reliably prevents the corrugated tube (1) from coming off from the fitting tube portion (11). In the corrugated pipe (1) formed by blow molding, the pipe radial side surface of the convex part (2) of the pipe wall (4) may be slightly inclined with respect to the pipe radial direction. In such a case, the hook pieces (22) and (22) become slippery only by bringing the tip of the hook pieces (22) and (22) into contact with the inclined side surface of the convex portion (2). A sharp bite claw (25), (25) ... is formed at the tip of the latch piece (22), (22), and this bite claw (25), (25) ... is cut into the side surface of the convex part (2). By doing so, even if the side surface of the convex portion (2) is inclined, it is possible to reliably prevent the corrugated tube (1) from coming off.

  Further, simultaneously with the biting of the biting claws (25), (25), the inner wall surface of the expanded fitting tube portion (11) is elastically restored, so that the curved surface (19b) of the projection (19) is different. The protrusion (19) is a gap between the adjacent protrusions (2) and (2) at the end of the corrugated tube (1) so as to be along the corner of the protrusion (2) on the side far from the inlet (14). Fit into. Thereby, the corrugated tube (1) can be firmly positioned in the fitting tube portion (11). Further, when the protrusion (19) is fitted into the gap between the adjacent convex portions (2) and (2), the inner wall surface of the fitting tube portion (11) collides with the outer wall surface of the corrugated tube (1). A sound is generated, so that the corrugated tube (1) is completely inserted and the insertion is completed.

  In this way, when the insertion of one corrugated pipe (1) with one touch is completed, the end of the other corrugated pipe (1) is then connected to the other fitting cylinder (11) of the pipe joint (10). In the same manner as described above, the corrugated pipes (1) and (1) are connected to each other through the pipe joint (10). A ring-shaped packing (31) is interposed between the butted end faces of the concave portions (3) and (3) of the corrugated tubes (1) and (1).

  Instead of such a ring-shaped packing (31), for example, as shown in FIGS. 8 and 9, a plurality of annular rings are provided on the outer periphery of the tip recesses (3) and (3) of the corrugated tubes (1) and (1). A short cylindrical packing (36) (36) having fins (35) (35) is externally fitted. Then, the recesses (3) and (3) to which the packings (36) and (36) are attached are fitted into the connecting portion (12) of the pipe joint (10), and the annular fins (35) of the packings (36) and (36) are inserted. The water may be stopped by pressing (35)... Against the inner wall surface of the connecting portion (12).

  FIG. 10 shows a pipe joint (40) made of synthetic resin according to another embodiment. This pipe joint (40) connects the end of the corrugated pipe (1) and the end of the helical corrugated pipe (50) as a different kind of pipe different from the corrugated pipe (1). .

  That is, in this pipe joint (40), the fitting tube portion (11) is formed at one end of the joint body (41), and the connection tube portion (42) is formed at the other end of the joint body (41). Has been. And the fitting cylinder part (11) and the connection cylinder part (42) are connected via the connection part (43).

  The connecting tube portion (42) is formed in a spiral wave shape that allows the end portion of the spiral corrugated tube (50) to be screwed together. The connecting portion (43) has a substantially circular cross section in the tube diameter direction, and the concave portion (3) of the corrugated tube (1) can be inserted into the connecting portion (43).

  Therefore, as shown in FIG. 11, the end portion of the corrugated pipe (1) is inserted into the fitting tube portion (11) of the pipe joint (40) in the same manner as described above, and the end of the spiral corrugated pipe (50) is thus inserted. The end of the corrugated tube (1) and the end of the spiral corrugated tube (50) are connected to each other by screwing the portion into the connecting tube portion (42).

  In this embodiment, the end portion of the spiral corrugated tube (50) is externally fitted to the connecting tube portion (42), but may be internally fitted. Also, as shown in FIG. 12, the connecting tube portion (42) of the pipe joint (40) is connected via a helically-shaped connecting joint pipe (51) as a different kind of pipe from the corrugated pipe (1). And a spiral corrugated tube (52) of the same diameter may be connected to this. That is, one end side of the joint pipe for connection (51) is screwed onto the connection cylinder part (42) of the pipe joint (40), and the joint for connection is connected to the end of the spiral corrugated pipe (52). The other end of the tube (51) may be screwed and fitted. In FIG. 11 and FIG. 12, (53) is a waterproofing tape.

  FIG. 13 shows a pipe joint (60) made of synthetic resin according to still another embodiment. The pipe joint (60) includes an end of the corrugated pipe (1) and an end of a straight pipe (70) having a smooth inner and outer peripheral surface as a different kind of pipe different from the corrugated pipe (1). Are connected.

  That is, in this pipe joint (60), the fitting tube portion (11) is formed at one end of the joint body (61), and the connection tube portion (62) is formed at the other end of the joint body (61). Has been. And the fitting cylinder part (11) and the connection cylinder part (62) are connected via the connection part (63).

  The connecting cylinder part (62) is formed in a cylindrical shape into which the straight pipe (70) can be inserted. The connecting portion (63) has a substantially circular cross section in the tube diameter direction, and the concave portion (3) of the corrugated tube (1) can be inserted into the connecting portion (63). In addition, an annular constriction part (64) with which the tip of the straight pipe (70) inserted into the connection cylinder part (62) abuts between the connection cylinder part (62) and the coupling part (63) is inward. It is formed in a protruding state.

  Therefore, as shown in FIG. 14, the end portion of the corrugated pipe (1) is inserted into the fitting tube portion (11) of the pipe joint (60) in the same manner as described above, and the end portion of the straight pipe (70) is inserted. The end of the corrugated tube (1) and the end of the straight tube (70) are inserted into the connecting tube portion (62) so that the tip is brought into contact with the constricted portion (64). Are connected to each other.

  In this embodiment, the end of the straight pipe (70) is fitted into the connecting cylinder (62), but it may be fitted outside. In FIG. 14, (71) is a water-stopping tape.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, not only the connection between the corrugated pipe and the pipe joint but also the connection between the corrugated pipe and the pipe material other than the pipe joint may be applied to the structure of the pipe connecting portion of the present invention. In addition, the corrugated tube is not limited to a convex portion having a substantially square cross section and a concave portion having a circular cross section, and for example, both the concave and convex portions may be formed to have a substantially square cross section. Further, the corrugated portion of the corrugated tube is not limited to an annular shape, and may be a spiral shape. Moreover, as a latching piece, it is not restricted to a metal plate, For example, the synthetic resin board integrally molded in the inner wall face of the fitting cylinder part may be sufficient.

It is a disassembled perspective view which shows the structure of the pipe connection part using the pipe joint which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of a pipe joint. Similarly, it is a longitudinal sectional view of the vicinity of the retaining member. It is a partially broken perspective view of the fitting cylinder part of a pipe joint. It is the exploded perspective view similarly. It is a longitudinal cross-sectional view which shows the state in the middle of insertion of a corrugated tube. It is a longitudinal cross-sectional view which shows the state of insertion completion of a corrugated tube. It is a longitudinal cross-sectional view of the corrugated tube which attached packing. It is a longitudinal cross-sectional view which shows the state of insertion completion of the corrugated tube similarly. It is a perspective view of the pipe joint which concerns on another embodiment. It is a longitudinal cross-sectional view which shows the state which connected the corrugated pipe and the dissimilar pipe via the pipe joint. It is a longitudinal cross-sectional view which shows the state which connected the connection cylinder part of the pipe joint, and the spiral corrugated pipe via the different kind | species pipe | tube. It is a perspective view of the pipe joint concerning another embodiment. It is a longitudinal cross-sectional view which shows the state which connected the corrugated pipe and the dissimilar pipe via the pipe joint.

Explanation of symbols

(1) Corrugated tube
(2) Convex part
(3) Concave
(10) (40) (60) Fitting
(11) Mating cylinder
(12) Connecting part
(13) Fitting body
(14) Insert
(19) Projection
(21) Base piece
(22) Hook
(23) Biasing piece
(24) Stop piece
(25) Biting nails
(42) (62) Connection tube
(50) (51) (70) Heterogeneous tube

Claims (17)

From a synthetic resin corrugated tube in which at least one of the pipes connected to each other has convex portions and concave portions alternately in the tube axis direction, and the cross section in the tube radial direction of the convex portions is formed in a substantially square shape The corrugated tube end portion is a structure of a tube connection portion in which the cross section in the tube diameter direction of the other synthetic resin tube material is inserted into a substantially cylindrical fitting tube portion, and these are connected, On the inner wall surface of the fitting cylinder portion, there is provided a latching piece made of a thin-walled rigid material that gradually increases inward as the distance from the insertion port of the fitting cylinder portion increases and has elasticity in the inner and outer directions. The corrugated tube end portion is protruded outwardly against the elastic force by the convex portion of the corrugated tube end portion, thereby allowing the corrugated tube end portion to be inserted into the fitting tube portion and the fitting. The hook is inserted into the gap between the adjacent convex portions of the corrugated tube end portion inserted into the joint tube portion. By fitting the piece with its elastic return force, the end of the latching piece is brought into contact with the convex part far from the insertion port among the adjacent convex parts, thereby fitting the corrugated tube end part. The urging piece extending from the latching piece is brought into contact with the inner wall surface of the fitting cylinder part so as to prevent the withdrawal from the tubular part, and the inward direction of the latching piece. A structure of a pipe connecting portion characterized in that the protruding piece is held outward and is urged inward to the hooking piece pushed outward . From a synthetic resin corrugated tube in which at least one of the pipes connected to each other has convex portions and concave portions alternately in the tube axis direction, and the cross section in the tube radial direction of the convex portions is formed in a substantially square shape The corrugated tube end portion is a structure of a tube connection portion in which the cross section in the tube diameter direction of the other synthetic resin tube material is inserted into a substantially cylindrical fitting tube portion, and these are connected, On the inner wall surface of the fitting cylinder portion, there is provided a latching piece made of a thin-walled rigid material that gradually increases inward as the distance from the insertion port of the fitting cylinder portion increases and has elasticity in the inner and outer directions. The corrugated tube end portion is protruded outwardly against the elastic force by the convex portion of the corrugated tube end portion, thereby allowing the corrugated tube end portion to be inserted into the fitting tube portion and the fitting. The hook is inserted into the gap between the adjacent convex portions of the corrugated tube end portion inserted into the joint tube portion. By fitting the piece with its elastic return force, the end of the latching piece is brought into contact with the convex part far from the insertion port among the adjacent convex parts, thereby fitting the corrugated tube end part. The corrugation is configured so as to prevent the tube portion from coming off, and extends from the base piece provided along the inner wall surface of the fitting tube portion, and is inserted into the fitting tube portion. The tube connecting portion is characterized in that the protruding state in the inward direction of the latching piece is maintained by pressing the base piece against the inner wall surface of the fitting tube portion by the convex portion of the tube end portion. Construction. The structure of the pipe connection part according to claim 1 or 2 , wherein the convex part and the concave part are formed in an annular shape. The structure of the pipe connection part according to any one of claims 1 to 3 , wherein the hooking piece is made of a metal plate. The structure of the pipe connection part according to any one of claims 1 to 4 , wherein an acute-angled biting claw that bites into the convex part is formed at a tip part of the latching piece. The stopper piece extending from the latching piece is passed through the fitting cylinder part and folded along the outer wall surface of the fitting cylinder part, and the latching piece is attached to the inner wall surface of the fitting cylinder part The structure of the pipe connection part according to any one of claims 1 to 5 . On the inner wall surface of the fitting tube portion, it is gradually pushed outward by the convex portion at the end portion of the corrugated tube in the middle of insertion, and in the gap between the adjacent convex portions at the end portion of the corrugated tube when insertion is completed The structure of the pipe connection part according to any one of claims 1 to 6, wherein a projection to be fitted is formed. The structure of the pipe connection part in any one of Claim 1 thru | or 7 which provided a pair of latching piece on the inner wall surface of the said fitting cylinder part so as to oppose each other. The other pipe member is a pipe joint provided with the fitting tube portions at both ends thereof, and the ends of the pair of corrugated tubes are connected to each other by inserting the corrugated tube end portions into the fitting tube portions, respectively. The structure of the pipe connection part according to any one of claims 1 to 8 . The other pipe member is a pipe joint provided with the fitting cylinder part at one end and a connection cylinder part at the other end, and the corrugated pipe end part is inserted into the fitting cylinder part, wherein the corrugated tube in part by connecting the ends of the heterogeneous tubes with different shapes, one of the claims 1 to 8 is intended to connect the ends of said heterologous tube and the end of the corrugated pipe The structure of the pipe connection part according to the above. Synthetic resin pipes that connect the ends of synthetic resin corrugated pipes having convex portions and concave portions alternately in the tube axis direction, and in which the cross section of the convex portion in the tube radial direction is formed in a substantially rectangular shape. It is a joint, and at both ends of the joint body, a tube section in the radial direction of inserting the corrugated pipe end is formed into a substantially square fitting tube portion, and the inner wall surface of these fitting tube portions As the distance from the insertion port of the fitting tube portion increases, the amount of protrusion in the inner direction gradually increases, and a latching piece made of a thin rigid material having elasticity in the inner and outer directions is provided, and the convex portion at the end portion of the corrugated tube The corrugated tube end portion inserted into the fitting tube portion while allowing the corrugated tube end portion to be inserted into the fitting tube portion by expanding the latching piece outward against the elastic force. The latching piece is fitted into the gap between the adjacent convex portions by the elastic restoring force, and the latching The tip that is brought into contact with the convex portion of the side away from the insertion opening of the adjacent convex portion, it was configured to block escape from the fitting tubular portion of the corrugated tube end, the The urging piece extending from the latching piece is brought into contact with the inner wall surface of the fitting cylinder part to maintain the projecting state of the latching piece in the inward direction and to be pushed outward. A pipe joint characterized in that the latching piece is urged inward . Synthetic resin pipes that connect the ends of synthetic resin corrugated pipes having convex portions and concave portions alternately in the tube axis direction, and in which the cross section of the convex portion in the tube radial direction is formed in a substantially rectangular shape. It is a joint, and at both ends of the joint body, a tube section in the radial direction of inserting the corrugated pipe end is formed into a substantially square fitting tube portion, and the inner wall surface of these fitting tube portions As the distance from the insertion port of the fitting tube portion increases, the amount of protrusion in the inner direction gradually increases, and a latching piece made of a thin rigid material having elasticity in the inner and outer directions is provided, and the convex portion at the end portion of the corrugated tube The corrugated tube end portion inserted into the fitting tube portion while allowing the corrugated tube end portion to be inserted into the fitting tube portion by expanding the latching piece outward against the elastic force. The latching piece is fitted into the gap between the adjacent convex portions by the elastic restoring force, and the latching The tip that is brought into contact with the convex portion of the side away from the insertion opening of the adjacent convex portion, it was configured to block escape from the fitting tubular portion of the corrugated tube end, the The hook piece extends from a base piece provided along the inner wall surface of the fitting tube portion, and the fitting piece is inserted into the fitting tube portion by the convex portion of the corrugated tube end portion. A pipe joint , wherein the hooking piece is kept in an inwardly projecting state by being pressed against the inner wall surface of the pipe. The pipe joint according to claim 11 or 12 , wherein the hooking piece is made of a metal plate. The joint body includes a connecting portion that connects the fitting tube portions, and the connecting portion has a substantially circular cross-section in the tube diameter direction and is smaller in outer circumference than the outer shape of the fitting tube portion. The pipe joint according to any one of claims 11 to 13 . The pipe joint according to claim 14 , wherein a recess having a substantially circular cross section in the pipe radial direction of the corrugated pipe can be inserted into the connecting part. The end portion of the corrugated tube made of synthetic resin having convex portions and concave portions alternately in the tube axis direction, and the cross section in the tube diameter direction of the convex portion being formed in a substantially square shape, and a shape different from the corrugated tube a synthetic resin pipe joint connecting the ends of the heterologous tube, one end of the fitting body, the fitting cylinder of substantially rectangular shape pipe diameter direction section inserting the corrugated tube end forming And, at the other end of the joint main body, a connecting cylinder part for connecting the end of the dissimilar pipe is formed, and the inner wall surface of the fitting cylinder part moves away from the insertion port of the fitting cylinder part. The amount of overhang in the inner direction gradually increases, and a latching piece made of a thin-walled rigid material having elasticity in the inner and outer directions is provided, and the latching piece is resisted against the elastic force by the convex portion of the corrugated tube end. By allowing the corrugated tube end to be inserted into the fitting tube by pushing outward, the fitting is allowed. The engaging piece is inserted into a gap between adjacent convex portions of the corrugated tube end inserted into the portion by the elastic return force, and the tip of the engaging piece is the insertion port among the adjacent convex portions. The urging piece extending from the latching piece is configured to prevent the corrugated tube end from coming off from the fitting cylinder part by contacting the convex part far from the urging piece, Abutting against the inner wall surface of the fitting cylinder portion, the latching piece is held in an inwardly extending state, and the latching piece pushed outward is urged inward. A pipe joint characterized by that . The end portion of the corrugated tube made of synthetic resin having convex portions and concave portions alternately in the tube axis direction, and the cross section in the tube diameter direction of the convex portion being formed in a substantially square shape, and a shape different from the corrugated tube a synthetic resin pipe joint connecting the ends of the heterologous tube, one end of the fitting body, the fitting cylinder of substantially rectangular shape pipe diameter direction section inserting the corrugated tube end forming And, at the other end of the joint main body, a connecting cylinder part for connecting the end of the dissimilar pipe is formed, and the inner wall surface of the fitting cylinder part moves away from the insertion port of the fitting cylinder part. The amount of overhang in the inner direction gradually increases, and a latching piece made of a thin-walled rigid material having elasticity in the inner and outer directions is provided, and the latching piece is resisted against the elastic force by the convex portion of the corrugated tube end. By allowing the corrugated tube end to be inserted into the fitting tube by pushing outward, the fitting is allowed. The engaging piece is inserted into a gap between adjacent convex portions of the corrugated tube end inserted into the portion by the elastic return force, and the tip of the engaging piece is the insertion port among the adjacent convex portions. The corrugated tube end is prevented from coming off from the fitting cylinder by contacting the convex part far from the base, and is provided along the inner wall surface of the fitting cylinder. The hook piece is extended from a piece, and the base piece is pressed against the inner wall surface of the fitting tube portion by the convex portion of the corrugated tube end inserted into the fitting tube portion. A pipe joint characterized by maintaining an inwardly extending state .

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