JP2009063019A - header - Google Patents

Abstract

There is provided a header capable of maintaining a connection at a fitting connection portion of a header piece and easily connecting a convex connection portion and a concave connection portion.
A header 10 is a reinforcement that holds an axis between header pieces while suppressing radial deflection on an outer periphery of a fitting connection portion 19 of a convex connection portion 17 and a concave connection portion 18 of a plurality of header pieces. The ring 21 is mounted and configured. A restricting means for restricting relative movement in the axial direction is provided on the inner periphery of the fitting connection portion 19. The restricting means includes an accommodation groove 29 on the outer peripheral surface of the convex connecting portion 17, a C ring 28, and an annular groove 23 on the inner peripheral surface of the concave connecting portion 18. The accommodation groove 29 is formed with a notch groove 30 for guiding a part of the C ring 28 from the accommodation groove 29 to the annular groove 23. The notch groove 30 is formed in an arc shape in cross section, and is provided at the opening edge on the distal end side of the accommodation groove 29.
[Selection] Figure 1

Description

  The present invention relates to a header used in, for example, a water supply system or a hot water supply system piping system. Specifically, a plurality of header pieces can be fitted and connected, and the connection at the fitting and connecting portion can be maintained, and a convex shape can be maintained. The present invention relates to a header that can easily connect the connecting portion and the concave connecting portion.

  In recent years, resin pipes have been widely used as pipes for water supply, hot water supply, or drainage, and such resin pipes are connected to headers to construct a water supply system, a hot water supply system, or a drainage system piping system. As a header used here, a header having a structure in which a plurality of header pieces are connected has been adopted recently.

  Specifically, the following header has been proposed as such a header (see, for example, Patent Document 1). This header is a T-shaped header base body having a T shape in which a straight channel and a rising channel are formed. Such a T-shaped header base is mounted with an outer cylinder made of trogamide resin (microcrystalline polyamide resin) on an inner cylinder made of PPS (polyphenylene sulfide or polyphenylene sulfide) resin, and a pipe holding ring is attached to the front end of the outer cylinder, These caps are configured to be screwed to prevent them from coming out. By comprising in this way, a plurality of resin pipes can be piped in a predetermined direction, construction can be simplified, and members can be omitted.

  Moreover, the proposal is made about the reinforcement structure in the connection part of resin-made headers (for example, refer patent document 2). That is, when the flange projecting from the opening end of the header body or the opening of the branch pipe is abutted with the flange of the joint member and both flanges are connected by the connecting member, it is formed on the back side of the header body or the flange of the branch pipe. A reinforcing member is fitted into the annular groove, and the connecting member is attached to the flange via the reinforcing member.

Furthermore, the branch pipe coupling which connects cheese using a split ring is known (for example, refer to patent documents 3). This branch fitting is an inner sleeve and an outer sleeve that are fitted and connected. A peripheral groove is formed on the peripheral surface of one sleeve, and the split ring is also fitted on the peripheral surface of the other sleeve. A circumferential groove to be joined is formed, and a split ring is fitted into both circumferential grooves to connect cheese.
JP 2007-100807 (page 2, page 3 and page 8) JP-A-2005-188682 (page 2, page 3 and page 7) JP 2000-2387 A (pages 2 to 4)

  However, in the T-shaped header substrate described in Patent Document 1, since the cap is screwed, deformation in the radial direction of the inner cylinder and the outer cylinder is restricted, but the outer periphery of the inner cylinder is moved outward. The cylinder is inserted and the outer cylinder is only engaged with the inner cylinder so as to form a resin pipe insertion opening. For this reason, when an impact force or a pulling force is applied to the connecting portion between the inner cylinder and the outer cylinder from the outside, the inner cylinder and the outer cylinder move relative to each other in the axial direction, and there is a risk that the connection between them will be removed. When the pulling force is strong, the inner cylinder or the outer cylinder may be damaged.

  On the other hand, in the resin header described in Patent Document 2, since the reinforcing member is specifically formed in a C shape, when the header body or the branch pipe receives a radial force, The force could not be received sufficiently, and the deformation of the header body or the branch pipe in the radial direction could not be sufficiently suppressed. In addition, although the connecting member is specifically a quick fastener and connects the flanges, the quick fastener is formed in a substantially C-annular shape, so that it may come off when a strong force acts on the connecting portion. there were.

  In addition, for the branch pipe joint described in Patent Document 3, since the circumferential grooves provided in both sleeves are only configured to have a semicircular cross section, a split ring is fitted to one sleeve. Thus, when the other sleeve is connected, the connection is not easy, and there is a problem that the sleeve is damaged if the connection is forced.

  Accordingly, an object of the present invention is to provide a header that can maintain the connection at the fitting connection portion of the header piece and can easily connect the convex connection portion and the concave connection portion. It is in.

  In order to achieve the above object, the header of the invention according to claim 1 is configured such that the convex connection portions and the concave connection portions of the plurality of header pieces are fitted and connected, and the header pieces can be relatively rotated. Header. And the regulation means which regulates the relative movement to the axial direction of a convex connection part and a concave connection part is provided in the inner circumference of the fitting connection part of each header piece, and this regulation means is the outer peripheral surface of a convex connection part. In the state where the housing groove, the C-ring housed in the housing groove with a reduced diameter, and the inner surface of the concave coupling portion are fitted with the convex coupling portion and the concave coupling portion. An annular groove in which a part of the C-ring is accommodated, and a part of the C-ring is guided from the accommodation groove to the annular groove when the convex coupling part and the concave coupling part are fitted and connected to the accommodation groove. A notch groove is formed, and the notch groove is formed in an arc shape in cross section, and is provided at an opening edge on the tip end side of the convex coupling portion of the accommodation groove.

  According to a second aspect of the present invention, the header of the invention according to the first aspect of the present invention is the reinforcing member according to the first aspect, wherein the outer periphery of the fitting connection portion suppresses the bending in the radial direction of the convex connection portion and the concave connection portion and holds the axis between the header pieces. A ring is attached.

  According to a third aspect of the present invention, there is provided a header according to the third aspect, wherein the reinforcing ring is provided across the outer peripheral surfaces of the convex connection portion and the concave connection portion when the convex connection portion and the concave connection portion are fitted and connected. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a header according to any one of the first to third aspects, wherein the annular groove is formed in a semicircular shape based on a circle of a C ring, and the receiving groove is completely received by the C ring. As described above, it is a long hole having an arc based on the circle of the C ring.

  According to a fifth aspect of the present invention, in the header according to the fourth aspect, the center line of the circle constituting the annular groove is located closer to the distal end side of the convex connecting portion than the center line constituting the circle of the receiving groove. It is characterized by.

  In the header according to the first aspect of the present invention, since the restricting means is provided on the inner periphery of the fitting connecting portion of each header piece, the relative movement in the axial direction of the convex connecting portion and the concave connecting portion is restricted. Is done. Therefore, in such a header, even when an impact force or a pulling force is applied from the outside, the connection at the fitting connection portion of the header piece can be maintained.

  In addition, the receiving groove is formed with a notch groove for guiding a part of the C-ring from the receiving groove to the annular groove when the convex connecting portion and the concave connecting portion are fitted and connected. It is formed in a circular arc shape in cross section, and is provided at the opening edge on the distal end side of the convex connecting portion of the receiving groove. For this reason, when the convex connection portion and the concave connection portion are fitted and connected, a part of the C-ring having a reduced diameter is transferred to the annular groove through the notch groove while the diameter of the C-ring is expanded. Therefore, the convex connection part and the concave connection part can be easily connected.

  In the header of the invention according to claim 2, a reinforcing ring is mounted on the outer periphery of the fitting connection portion. Therefore, in addition to the effect of the invention according to claim 1, the radial connection of the convex connection part and the concave connection part is suppressed, the axis line between the header pieces is held, and the header piece is prevented from being deformed in the fitting connection part. It is possible to firmly maintain the connection of the fitting connection portion and to prevent the shake of the axis between the header pieces.

  In the header of the invention according to claim 3, the reinforcing ring is provided across the outer peripheral surfaces of the convex connection portion and the concave connection portion when the convex connection portion and the concave connection portion are fitted and connected. For this reason, in addition to the effect of the invention according to claim 2, the movement of the convex coupling portion and the concave coupling portion to deviate from their axial directions is restricted, and the blurring of the axial line between the header pieces can be effectively prevented. .

  In the header of the invention according to claim 4, the annular groove is formed in a semicircular shape based on the circle of the C ring, and the receiving groove has a long hole having an arc based on the circle of the C ring so that the C ring is completely received It is. For this reason, in addition to the effect of the invention according to any one of claims 1 to 3, half of the C-ring is accommodated in the annular groove, and the remaining half is accommodated in the accommodation groove and the notch groove. And the movement to the axial direction of a concave connection part is suppressed most effectively, and the connection of a fitting connection part can be maintained more firmly.

  In the header of the invention according to claim 5, the center line of the circle constituting the annular groove is located closer to the distal end side of the convex coupling portion than the center line constituting the circle of the housing groove. Therefore, in addition to the effect of the invention according to claim 4, a synergistic effect with the notch groove can be exhibited, and the transition of the C-ring from the housing groove to the annular groove can be performed more smoothly through the notch groove. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the header 10 of the present embodiment has a second header piece 12 having an inverted T shape (the left end portion in the figure) having an inverted T shape. The middle header portion is fitted and connected, and a third header piece 13 (right end portion in the figure) having an inverted L shape is fitted and connected to the second header piece 12 (three stations). For this reason, both the first header piece 11 and the second header piece 12 and between the second header piece 12 and the third header piece 13 are relatively rotatable, and each header piece is predetermined. Can be directed.

  These header pieces are made of synthetic resin (engineering plastic) such as PPS resin. The first header piece 11 has a main flow path 14 that extends linearly in the horizontal direction in the figure and a branch flow path 15 that extends perpendicular to the main flow path 14. A resin pipe 16 is connected to one end portion (left end portion in the figure) of the main flow path 14 and the tip end portion of the branch flow path 15, and the other end side (right end side in the figure) of the main flow path 14 is A convex connecting portion 17 is formed.

  In the second header piece 12, one end side (the left end side in the drawing) of the main flow path 14 is a concave connection part 18, and the other end side is a convex connection part 17. Is configured to be connectable. The convex connection part 17 of the first header piece 11 is configured to be fitted and connected to the concave connection part 18 of the second header piece 12. The third header piece 13 is configured such that the distal end side of the main flow path 14 becomes a concave connecting portion 18, and the resin pipe 16 can be connected to the distal end portion of the branch flow path 15. A concave connection portion 18 of the third header piece 13 is fitted and connected to the convex connection portion 17 of the second header piece 12.

  FIG. 3 is a cross-sectional view showing the third header piece 13, and the concave connecting portion 18 constituting the fitting connecting portion 19 will be described. The concave connecting portion 18 is formed in a cylindrical shape, and a locking projection 20 having an annular shape is provided on the outer peripheral surface thereof. A thin cylindrical reinforcing ring 21 as shown in FIGS. 5 (a) and 5 (b) is fitted on the outer peripheral surface of the concave connecting portion 18, and its end is in contact with the locking projection 20. (See FIG. 6B). As shown in the enlarged view of FIG. 5A, an engagement protrusion 22 that is bent inward is provided at one end of the reinforcing ring 21. The reinforcing ring 21 is made of a highly rigid metal material such as stainless steel. An annular groove 23 formed in a semicircular cross section based on a circle of a C ring 28 described later and extending in the circumferential direction is formed on the inner peripheral surface of the concave connecting portion 18, and the opening inner peripheral surface expands toward the opening side. A tapered guide surface 24 having a diameter is formed.

  FIG. 4 is a cross-sectional view showing the second header piece 12, and the convex connection portion 17 constituting the fitting connection portion 19 will be described. The convex connecting portion 17 is formed in a cylindrical shape so that the outer diameter thereof is slightly smaller than the inner diameter of the concave connecting portion 18, and is configured to be fitted and connected to the concave connecting portion 18. The base end portion of the convex connection portion 17 has a step that is expanded from the front end portion through a tapered inclined surface 25 that increases in diameter toward the base end side so as to correspond to the guide surface 24 of the concave connection portion 18. A portion 26 is provided. An annular engagement groove 27 is recessed in the outer periphery of the step portion 26, and the engagement protrusion 22 of the reinforcing ring 21 is engaged with the annular engagement groove 27. And the radial direction of the convex connection part 17 and the concave connection part 18 is carried out by fitting the reinforcement ring 21 formed in the cylindrical shape on the outer periphery of the fitting connection part 19 of the convex connection part 17 and the concave connection part 18. Bending (expansion / contraction or deformation) in the vertical direction of FIG. 1 is restricted.

  On the tip side of the inclined surface 25 of the convex connecting portion 17, an accommodation groove 29 is formed which is formed in a long hole shape having an arc based on the circle of the C ring 28 and extends in the circumferential direction. The size of the C-ring 28 is set so as to be completely accommodated in the accommodating groove 29 when the C-ring 28 is fitted and connected to the portion 18. The C-ring 28 is configured to be freely expandable and contractible by a metal having spring properties such as phosphor bronze and stainless steel.

  As shown in FIG. 6 (d), the opening edge on the distal end side of the convex connecting portion 17 of the receiving groove 29 is cut out in an arc shape, and a part of the C ring 28 is parted from the receiving groove 29 to the concave connecting portion 18. A notch groove 30 is provided for guiding to the annular groove 23. The notch groove 30 is formed in an arc shape (about 1/6 of the circle of the C ring) based on a part of the circle of the C ring 28 having a circular cross section. So that it can smoothly transition to the annular groove 23 through the notch groove 30. The center line CL1 of the circle constituting the annular groove 23 is located closer to the distal end side of the convex connecting portion 17 than the center line CL2 constituting the circle of the receiving groove 29, and is synergistic with the notch groove 30. Thus, the C-ring 28 is configured to easily move from the receiving groove 29 to the annular groove 23 via the notch groove 30.

  The C ring 28, the accommodation groove 29, and the annular groove 23 constitute a restricting means for restricting the relative movement of the convex connecting portion 17 and the concave connecting portion 18 in the axial direction. Then, when the C-ring 28 is accommodated in both the accommodation groove 29 and the annular groove 23 with the convex connection portion 17 and the concave connection portion 18 fitted (see FIG. 6D), the convex connection portion. The relative movement in the axial direction (the left-right direction in FIG. 1) of 17 and the concave connecting portion 18 is restricted. A pair of storage holes 31 are provided at the front end side of the storage groove 29 of the convex connecting portion 17, and a rubber seal ring 32 is fitted into each storage hole 31. These seal rings 32 form a watertight space between the convex coupling part 17 and the concave coupling part 18.

Next, since the structure of the part to which the resin pipe 16 is connected in each header piece is configured similarly, the structure of the third header piece 13 will be described.
As shown in FIG. 3, the main body cylinder portion 41 of the third header piece 13 has a substantially cylindrical shape, an outer cylinder portion 43 that is formed to protrude on the outer peripheral side of the main body cylinder portion 41, and the inner periphery of the main body cylinder portion 41. A cylindrical inner cylindrical portion 44 is formed so as to protrude on the side and to which the resin pipe 16 is fitted. A branch channel 15 through which water flows is formed on the inner periphery of the inner cylindrical portion 44.

  A plurality of protrusions 45 are provided on the outer peripheral surface of the outer cylindrical portion 43, and an insertion space 46 into which the resin pipe 16 is inserted is formed on the inner peripheral side of the main body cylindrical portion 41. The cap 47 has a plurality of recesses 48 on the inner peripheral surface thereof, and the recesses 48 are engaged with the protrusions 45 of the outer cylinder part 43 by fitting the cap 47 into the outer cylinder part 43. 47 is configured to be connected to the main body cylinder portion 41. An annular engagement groove 27 is provided on the outer peripheral surface of the cap 47, and an engagement protrusion 22 of the reinforcing ring 21 similar to the above is engaged. For this reason, the movement in the radial direction of the outer cylindrical portion 43 and the cap 47 is restricted, and the cap 47 can be prevented from being detached from the outer cylindrical portion 43. A pipe insertion opening 49 into which the resin pipe 16 is inserted is provided at the outer end portion of the cap 47.

  Inside the outer cylinder 43, an intermediate cylinder 50 having an engagement step that is engaged with a locking step on the inner peripheral surface thereof is disposed. A retaining ring 51 made of a metal such as stainless steel is interposed between the outer end surface of the outer cylindrical portion 43 and the inner peripheral surface of the cap 47 in a state where the position of the retaining ring 51 is regulated by a regulating body 52. A retaining piece 51 a is formed on the inner peripheral portion of the retaining ring 51 so as to project obliquely, and the resin pipe 16 is retained by biting into the outer peripheral portion of the resin pipe 16. A split ring 54 is interposed between the retaining ring 51 and the first inclined surface 53 on the inner periphery of the cap 47, and is configured to maintain the inclination angle of the retaining piece 51a.

  A second inclined surface 55 having the same inclination angle as the first inclined surface 53 of the cap 47 is provided at the outer end of the split ring 54, and is split via a retaining piece 51 a by a force in the pulling direction of the resin pipe 16. When the ring 54 receives a force outward in the axial direction, the split ring 54 is configured to be reduced in diameter. A fastening surface 56 provided on the inner peripheral surface of the split ring 54 fastens the resin pipe 16. A rubber O-ring 57 is disposed between the main body cylinder portion 41 and the intermediate cylinder 50 so as to be in close contact with the outer peripheral surface of the resin pipe 16 to be inserted.

  Inside the split ring 54, an insertion guide 58 that is pressed by the tip of the resin pipe 16 to guide the insertion of the resin pipe 16 is disposed. The insertion guide 58 is formed in a C-ring shape and can be expanded and contracted. The outer diameter of the insertion guide 58 is the same as or slightly larger than the outer diameter of the resin pipe 16, and the inner diameter is slightly larger than the outer diameter of the inner cylindrical portion 44. A step for retaining is provided on the inner peripheral surface of the split ring 54, and the outer peripheral portion of the contact surface 59 of the insertion guide 58 is engaged with the step for retaining so that the insertion guide 58 is retained. It has become. An arcuate surface is formed on the inner peripheral surface on the inner end side of the insertion guide 58 so that the insertion guide 58 can move smoothly when the outer peripheral surface of the inner cylindrical portion 44 moves inward.

  The main body cylinder portion 41, the cap 47, the intermediate cylinder 50, the split ring 54, the insertion guide 58, and the like are formed of a synthetic resin (engineering plastic) such as PPS resin or polyacetal resin (POM). The resin pipe 16 is made of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.).

  When the resin pipe 16 is inserted from the pipe insertion opening 49 of the cap 47, the tip surface of the resin pipe 16 comes into contact with the contact surface 59 of the insertion guide 58. In this state, when the resin pipe 16 is further inserted, the resin pipe 16 is guided by the insertion guide 58, the insertion guide 58 and the resin pipe 16 pass through the retaining piece 51a of the retaining ring 51, and the distal end portion of the insertion guide 58 is The O-ring 57 is reached. Subsequently, when the resin pipe 16 is further inserted, the insertion guide 58 and the resin pipe 16 pass through the O-ring 57 and enter the insertion space 46, and the distal end portion of the insertion guide 58 hits the inner back wall forming the insertion space 46. The insertion of the resin pipe 16 is completed.

Next, the effect | action is demonstrated about the header comprised as mentioned above.
As shown in FIG. 6A, when the convex connection part 17 of the second header piece 12 is fitted and connected to the concave connection part 18 of the third header piece 13, the receiving groove 29 of the convex connection part 17. The C-ring 28 is mounted at the position, and the seal ring 32 is housed in the pair of housing holes 31. On the other hand, the reinforcing ring 21 is fitted on the outer periphery of the concave connecting portion 18, and the end thereof is brought into contact with the locking projection 20. In this state, the convex connection portion 17 of the second header piece 12 is fitted into the concave connection portion 18 of the third header piece 13. At this time, the C-ring 28 is pressed by the guide surface 24 of the concave connecting portion 18 to be reduced in diameter, and is guided into the receiving groove 29.

  Subsequently, as shown in FIG. 6B, when the convex coupling portion 17 is further fitted into the concave coupling portion 18, the C-ring 28 is further reduced in diameter and accommodated in the accommodation groove 29 (FIG. 6). At the same time, the engagement protrusion 22 side of the reinforcing ring 21 slides on the outer peripheral surface of the step portion 26 of the convex connection portion 17. Finally, as shown in FIG. 6 (c), the convex connecting portion 17 is further fitted into the concave connecting portion 18 so that the front end surface of the concave connecting portion 18 contacts the outer surface of the step portion 26 of the convex connecting portion 17. Make contact. At this time, at the outer peripheral portion of the convex connecting portion 17, the engaging protrusion 22 of the reinforcing ring 21 engages with the annular engaging groove 27 on the outer peripheral surface of the step portion 26 of the convex connecting portion 17, and the reinforcing ring 21 is positioned. Is done. Therefore, the highly rigid cylindrical reinforcing ring 21 is arranged so as to cover the fitting connection part 19 between the convex connection part 17 and the concave connection part 18, and in the radial direction of the convex connection part 17 and the concave connection part 18. Movement is suppressed. Further, since the reinforcing ring 21 is provided across the outer peripheral surface of the stepped portion 26 of the convex connecting portion 17 and the outer peripheral surface of the concave connecting portion 18 to the locking projection 20, the convex connecting portion 17 and the concave connecting portion are provided. The movement of the portion 18 out of the axial direction is suppressed.

  On the other hand, the diameter of the C-ring 28 is enlarged at the inner peripheral portion of the concave connecting portion 18, and a part of the C-ring 28 is guided and accommodated in the annular groove 23 through the notch groove 30. Thus, almost half of the C-ring 28 enters the annular groove 23, and the other half enters the receiving groove 29 and the notch groove 30. At this time, the notch groove 30 is formed at the opening edge on the distal end side of the convex connecting portion 17 of the receiving groove 29 and is formed in an arc shape based on a part of the circle of the C ring 28, and the circular groove 23 The center line CL1 is located closer to the distal end side of the convex connecting portion 17 than the center line CL2 of the circle of the receiving groove 29. Therefore, as the convex connecting portion 17 is fitted into the concave connecting portion 18, the C ring 28 easily enters the cutout groove 30 while expanding in diameter, and further smoothly moves into the annular groove 23.

  Accordingly, as described above, the convex connecting portion 17 and the concave connecting portion 18 are restrained from moving in the radial direction by the reinforcing ring 21, and the convex connecting portion 17 and the concave connecting portion 18 are axially moved by the C ring 28. Movement is suppressed. Therefore, it is possible to avoid the fitting of the convex coupling part 17 and the concave coupling part 18 from being released when a pulling force in the axial direction acts on the convex coupling part 17 or the concave coupling part 18. By the above operation procedure, the convex connection part 17 and the concave connection part 18 are fitted and connected.

The effects exhibited by the above embodiment will be described collectively below.
In the header 10 of the embodiment, since the reinforcing ring 21 is attached to the outer periphery of the fitting connection part 19 of each header piece, the radial connection of the convex connection part 17 and the concave connection part 18 is suppressed, The axis line between the header pieces is maintained. Furthermore, since the restricting means is provided by the C ring 28, the accommodation groove 29 and the annular groove 23 on the inner periphery of the fitting connection part 19, the convex connection part 17 and the concave connection part 18 are relatively arranged in the axial direction. Movement is restricted. Therefore, in such a header 10, even when an impact force or a pulling force is applied from the outside, the header piece can be prevented from being deformed in the fitting connection portion 19, and the connection of the fitting connection portion 19 can be firmly maintained. While durability can be improved, the blurring of the axis line between header pieces can be prevented.

  In addition, since the notch groove 30 is formed in the receiving groove 29, when the convex connecting portion 17 and the concave connecting portion 18 are fitted and connected, the C-ring 28 expands from the receiving groove 29. A part of the groove is transferred to the annular groove 23 through the notch groove 30, and the convex connection part 17 and the concave connection part 18 can be easily connected.

  The notch groove 30 is formed at the opening edge of the receiving groove 29 on the distal end side of the convex connecting portion 17, so that the C-ring 28 is connected when the convex connecting portion 17 and the concave connecting portion 18 are connected. A part of the housing groove 29 can be smoothly transferred to the annular groove 23 through the notch groove 30.

  Further, since the notch groove 30 is formed in an arc shape based on a part of the circle of the C ring 28 having a circular cross section, the C ring 28 is easy to move from the receiving groove 29 to the notch groove 30, and is annular. The transition of the C ring 28 to the groove 23 can be performed more smoothly, and the C ring 28 can be easily held in that position after the completion of the transition of the C ring 28.

  The reinforcing ring 21 has a distal end side than the outer peripheral surface of the step portion 26 of the convex connection portion 17 and the locking projection 20 of the concave connection portion 18 when the convex connection portion 17 and the concave connection portion 18 are fitted and connected. It is provided across the outer peripheral surface of. Therefore, the axial direction of the convex connection part 17 and the concave connection part 18 is maintained, and the blurring of the axis line between the header pieces can be effectively prevented.

  The annular groove 23 is formed in a semicircular shape based on the circle of the C ring 28, and the receiving groove 29 is a long hole having an arc based on the circle of the C ring 28 so that the C ring 28 is completely received. ing. For this reason, half of the C-ring 28 is accommodated in the annular groove 23 and the remaining half is accommodated in the accommodation groove 29 and the notch groove 30, so that the convex connecting portion 17 and the concave connecting portion 18 are most moved in the axial direction. It can suppress effectively and can maintain the connection of the fitting connection part 19 more firmly.

  -Since the center line CL1 of the circle of the annular groove 23 is located closer to the distal end side of the convex connecting portion 17 than the center line CL2 of the circle of the accommodation groove 29, a synergistic effect with the notch groove 30 can be exhibited. The transition of the C-ring 28 from the housing groove 29 to the annular groove 23 through the notch groove 30 can be performed more smoothly.

In addition, this embodiment can also be changed and embodied as follows.
As shown in FIG. 7A, the first curved surface 33 is formed by chamfering the boundary portion between the housing groove 29 and the notch groove 30, and the second curved surface 34 is formed by chamfering the boundary portion between the housing groove 29 and the annular groove 23. It can be. When configured in this way, the movement when the C-ring 28 moves from the housing groove 29 to the annular groove 23 via the notch groove 30 can be performed more smoothly.

  -As shown in Drawing 7 (b), notch slot 30 can be constituted by two inclined surfaces, the 1st inclined surface 35 and the 2nd inclined surface 36. As shown in FIG. Even when configured in this way, the same effects as in the embodiment can be exhibited.

  In addition to the cutout groove 30 of the embodiment, a cutout groove can also be formed at the opening edge on the tip side of the annular groove 23 of the concave connecting portion 18. In this case, the transition of the C ring 28 from the housing groove 29 to the annular groove 23 can be made smoother, and at the same time, the C ring 28 can be held well.

It is also possible to set the annular groove 23 of the concave connecting portion 18 to be smaller or larger than a semicircle based on the circle of the C ring 28.
In the embodiment, the header 10 is composed of three connected header pieces. However, the header 10 is composed of two connected header pieces, or four connected header pieces. You can also. In this case, the connection structure of the fitting connection part 19 is the same as that of the said embodiment.

-The thickness of the reinforcing ring 21 does not need to be uniform. For example, the portion of the engaging protrusion 22 can be thickened.
The header piece may be made of copper, such as brass or bronze, or a metal such as aluminum. In this case, the reinforcing ring 21 on the outer periphery of the fitting connection portion 19 can be omitted, and at that time, the bending in the radial direction of the convex connection portion 17 and the concave connection portion 18 can be sufficiently suppressed.

-Instead of the resin pipe 16, it is also possible to use soft metal pipes, such as copper and a copper alloy.
Further, the technical idea that can be grasped from the embodiment will be described below.

  The header according to any one of claims 1 to 5, wherein the header piece is made of a synthetic resin. When comprised in this way, the effect of the invention which concerns on any one of Claims 1-5 can be effectively exhibited about the header made from a synthetic resin.

  A tapered guide surface is formed on the inner peripheral surface on the distal end side of the concave connecting portion, and an inclined surface corresponding to the guide surface is formed on the outer peripheral surface on the proximal end side of the convex connecting portion. The header according to any one of claims 1 to 5, wherein: When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-5, when fitting a convex connection part to a concave connection part, a C ring is smoothly diameter-reduced and accommodated. It can be accommodated in the groove.

Sectional drawing which shows the header in embodiment. The front view which shows the header of embodiment. Sectional drawing which shows a 3rd header piece. Sectional drawing which shows a 2nd header piece. (A) is sectional drawing which decomposes | disassembles and shows a convex connection part, a concave connection part, and C ring, (b) is a front view which shows C ring. (A)-(c) is sectional drawing for demonstrating an effect | action at the time of inserting the convex connection part of a header piece in a concave connection part, (d) is sectional drawing which expands and shows the principal part of (c). . (A) is sectional drawing which shows the other example of the boundary part of an accommodation groove and a notch groove, and the boundary part of an accommodation groove and an annular groove, (b) is sectional drawing which shows another example of a notch groove.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Header, 11 ... 1st header piece, 12 ... 2nd header piece, 13 ... 3rd header piece, 17 ... Convex connection part, 18 ... Concave connection part, 19 ... Fitting connection part, 20 ... Locking protrusion Part 21, reinforcing ring 22, engaging protrusion 23, annular groove 27, annular engaging groove 28, C ring 29, receiving groove 30, notched groove, CL 1 center line of annular groove, CL2: Center line of the receiving groove.

Claims (5)

A plurality of header piece convex connection portions and concave connection portions are fitted and connected, and each header piece is configured to be relatively rotatable,
On the inner periphery of the fitting connection portion of each header piece, there is provided restriction means for restricting relative movement of the convex connection portion and the concave connection portion in the axial direction, and the restriction means is provided on the outer peripheral surface of the convex connection portion. The C-ring is provided on the inner peripheral surface of the concave coupling portion, and the convex coupling portion and the concave coupling portion are fitted to each other. And a part of the C-ring for guiding the part of the C-ring from the housing groove to the annular groove when the convex coupling part and the concave coupling part are fitted and connected to each other. A header characterized in that a notch groove is formed, the notch groove is formed in an arc shape in cross section, and is provided at an opening edge on a tip end side of the convex coupling portion of the accommodation groove. The reinforcement ring which hold | maintains the axial line between header pieces by suppressing the bending to the radial direction of a convex connection part and a concave connection part is attached to the outer periphery of the said fitting connection part. The listed header. The said reinforcing ring is provided ranging over the outer peripheral surface of a convex connection part and a concave connection part, when a convex connection part and a concave connection part are fittingly connected. header. The annular groove is formed in a semicircular shape based on a circle of a C ring, and the receiving groove is a long hole having an arc based on the circle of the C ring so that the C ring is completely received. The header according to any one of claims 1 to 3. 5. The header according to claim 4, wherein a center line of a circle constituting the annular groove is located closer to a distal end side of the convex connecting portion than a center line constituting the circle of the housing groove.

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