JPH084979A - Coupling mechanism between piping duct and joint thereof - Google Patents

Abstract

PURPOSE:To facilitate the attachment of a piping duct with the use of a joint. CONSTITUTION:A continuous locking groove 35 having a specific width is formed in the lower surface of the bottom plate of a piping duct in the longitudinal direction of the latter, and a pair of locking protrusions having a space therebetween which continuously varies in a range with which the pair of locking protrusions can complementarily be engaged in the locking groove 35 are formed in the upper surface of the bottom plate of a joint for receiving the piping duct. When one end of the piping duct is pressed against the bottom plate of the joint, the locking protrusions are engaged in the locking groove 35, and the protrusions having the space therebetween is wider at their one end 46a, 46a at their the other end 46b, 46b are firmly pressed against the side surfaces of the locking groove 35, and accordingly, the piping duct can be coupled to the joint so that the fixing parts thereof are engaged together while their motion is limited in a direction in which they are separated from each other and a direction in which they come off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in attaching various pipes along a wall surface, and a pipe duct for supporting the pipe so as to cover the pipe and a joint of the pipe duct are mutually connected. The present invention relates to a connecting mechanism for connecting.

[0002]

2. Description of the Related Art For example, an air conditioner such as an air conditioner has a plurality of pipes connected between an outdoor unit installed outdoors and an indoor unit installed indoors.

When piping such a pipe body, the pipe body is covered with a piping duct so as not to impair the aesthetic appearance of the building and to prevent external forces from being applied, and Supports along the inner wall. In addition, since many pipe ducts of this type have a linear shape with multiple lengths, connect pipe ducts when piping a long distance or changing the angle midway. A joint is used to do this.

FIG. 14 shows a conventional resin duct 10 for piping used in an air conditioner. This duct is composed of a fixed portion 11 having a U-shaped cross section, and a cover portion 15 attached so as to cover the opening surface of the fixed portion 11 from above.

The upper ends of both side plates 11a and 11b of the fixing portion 11 are curved inward to form U-shaped grooves 12 and 12 in the longitudinal direction. The bottom plate 11c of the fixing portion 11 is provided with screw holes 13 for screwing the fixing portion 11 to a mounting surface at predetermined intervals.

On the other hand, both side plates 15a, 15 of the cover portion 15
At the lower end of b, locking portions 16, 16 that are bent inward are provided at intervals slightly smaller than the intervals between the grooves 12, 12 of the fixing portion 11, and both side plates 11 a, 11
In a state where b is pushed from the outside (or a state where the side plates of the cover portion 15 are pushed apart), the locking portions 16 and 16 are fixed.
This cover portion 1 can be inserted by inserting it into the grooves 12, 1.
5 can be attached to the fixed part 11.

FIG. 15 shows the structure of a conventional joint 20 for linearly connecting the piping ducts 10 having the above structure. This joint 20 is also made of resin similarly to the duct 10, and has a fixing portion 21 having a U-shaped cross section for first fixing to a wall surface and the like, and a cover portion 25 covering the upper surface of the fixing portion 21.
It consists of and.

Both side plates 21a, 21b of the fixed portion 21 of the joint
On the inner wall of the boss 2 for screwing the cover portion 25
2 and 22 are provided, and a screw hole 2 for screwing the fixing portion 21 to the mounting surface is provided substantially at the center of the bottom plate 21c.
3 is provided. Before and after the screw hole 23, stoppers 24, 24 for abutting the end of the bottom plate 11c of the fixed portion 11 of the duct 10 for piping to regulate the insertion depth of the duct 10 for piping are provided. Has been done.

The cover portion 25 of the joint 20 has the fixed portion 2
The cross section is formed in an inverted U shape so as to cover the upper surface of 1, and the cover portion 25 is screwed to the bosses 22 and 22 of the fixing portion 21 at the boundary between the side plates 25a and 25b and the upper plate 25c. Screw holes 26, 26 are provided.

By using the joint 20 constructed as described above,
When connecting the duct 10 for piping, as shown in FIG. 16, the fixing portion 2 of the joint 20 fixed to the mounting surface in advance.
The end portion of the fixed portion 11 of the pipe duct 10 is inserted from one end side of the pipe 1 and brought into contact with the stopper 24. Then, while holding the end portion of the fixing portion 11 by hand so that this position does not shift, the fixing portion 11 of the pipe duct 10 is fixed to the bottom plate 1 thereof.
A screw is fastened to the screw hole 13 of 1c and fixed to the mounting surface. After performing this screwing at multiple points, the joint 20
The same operation is performed on the other side of the fixing portion 1 of the pipe duct 10 as well.
Insert 1 and hold it by hand so that the position does not shift, and perform screwing work.

In this way, the two pipe ducts 10
Are connected via a joint 20, and then a necessary tubular body is passed through the fixing portions 11 and 11 to attach the respective cover portions 15 to the fixing portion 11, and further, the cover portion 2 of the joint 20.
Screw 5 on. By repeating such operations, piping can be performed in a state where the pipe is not visible from the outside.

[0012]

However, in the piping work using the conventional duct for piping and the joint as described above, when fixing the duct for piping to the mounting surface, the end portion of the duct must be attached to the joint without fail. It is necessary to carry out screwing work, etc. while holding it in a fixed position by hand, and if this work is done by one person, the work of fixing the fixing part of the duct becomes very complicated, and furthermore, the fixing work. Since the work can be performed only from the end side of the fixed portion of the duct, the middle portion of the duct is likely to be bent.

[0013] For this reason, there is a problem that inputting a plurality of workers causes a great increase in man-hours.

The present invention solves this problem, and provides a connecting mechanism for a pipe duct and its joint, which enables a single worker to easily perform the mounting work without causing the pipe duct to bend. It is an object.

[0015]

In order to solve the above-mentioned problems, a connecting mechanism for connecting a duct for piping and a joint thereof according to claim 1 of the present invention has a structure in which a pipe body is inserted inside and along a wall surface. A connecting mechanism for connecting a tubular duct for supporting and a tubular joint for receiving an end portion of the duct for inside to connect to another passage, the connecting mechanism comprising: On an outer wall of at least an end portion of the duct, a locking groove having a predetermined width formed so as to be continuous in the longitudinal direction of the duct for piping, and an inner wall of a duct receiving portion of the joint,
With respect to the locking groove of the pipe duct, which is projected so as to be continuous in the longitudinal direction of the joint with a width close to the width of the locking groove of the pipe duct and is received in the duct receiving portion of the joint. The engaging projections are engaged with each other in a non-return manner to restrict movement of the inner wall of the joint and the outer wall of the end portion of the duct for pipes in a direction of separating from each other. It is formed wider than other parts within the range where engagement with the stop groove is possible,
A wide portion is provided that presses the inner surface of the locking groove in a state of being engaged with the locking groove and restricts movement of the pipe duct with respect to the joint in the pull-out direction.

Further, a connecting mechanism of the pipe duct and its joint according to a second aspect of the present invention is a tubular pipe duct for supporting along the wall surface in a state where the pipe body is inserted thereinto,
A connecting mechanism for connecting an end portion of the duct for piping inside and a tubular joint for coupling to another passage with each other, the pipe duct being provided on at least an outer wall of the end portion of the pipe. Locking projection of a predetermined width formed so as to be continuous in the length direction of the duct for duct, and the length of the joint on the inner wall of the duct receiving portion of the joint with a width close to the width of the locking protrusion of the pipe duct. Which are formed so as to be continuous in the depth direction and which are non-reactively engaged with the locking projections of the pipe duct received in the duct receiving portion of the joint, so that the inner wall of the joint and the pipe duct are And a locking groove that restricts movement in a direction in which the end outer wall is separated from the end outer wall, and the locking groove is narrower than other portions within a range in which the locking projection can be engaged. Is formed, and the outer surface of the locking protrusion is engaged with the locking protrusion. Pressure, the narrow portion for restricting the movement of omission direction of the pipe duct for the joint is provided.

[0017]

With this construction, according to the present invention, if the locking groove or locking projection at the end of the piping duct is engaged with the locking projection or locking groove of the joint, the piping duct The end of the pipe duct and the joint are connected to each other in a state in which the movement of the end of the pipe in the direction away from the inner wall of the joint and the movement of the pipe duct with respect to the joint in the pulling direction are restricted.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show the structure of a piping duct 30 according to an embodiment of the present invention. The duct 30 for piping is made of synthetic resin, and has a tubular shape as a whole by a fixing portion 31 for fixing to a mounting surface and a cover portion 38 mounted so as to cover the upper surface of the fixing portion 31.

The fixing portion 31 is curved so that its cross section is substantially U-shaped, and the upper ends of the side plate portions 31a and 31b are
The groove 3 is curved inward slightly upward and has a U-shaped cross section on the outer peripheral side.
2, 32 are formed.

On the lower surface of the bottom plate 31c of the fixing portion 31, a pair of ribs 33, 33 for contacting the mounting surface are provided so as to project in parallel to each other and continuously in the longitudinal direction of the fixing portion 31. ing.

A pair of ribs 34, 34 projecting between the pair of ribs 33, 33 so as to be parallel to each other and continuous in the longitudinal direction of the fixing portion 31 are the same as the ribs 33, 33. The pair of ribs 34, 34 are provided at the height.
In the meantime, a locking groove 35 that engages with a locking projection of a joint 40 described later in a non-reversible manner is formed so as to be continuous in the length direction.

The engaging groove 35 has a guide portion 35a formed so that the width of the groove becomes narrower from the tip side of the ribs 34, 34 toward the bottom plate 31c, and from this guide portion 35a to the bottom plate 31c. The engaging portion 35b is formed so that the width of the groove becomes wider toward the front, and the cross-sectional shape of the groove is drum-shaped. In addition, in the central portion of the bottom plate 31c of the fixing portion 31, a high step portion 36 formed to be one step higher in order to obtain the depth of the locking groove 35 is provided so as to be continuous in the length direction. The high step portion 36 is provided with screw holes 37 at predetermined intervals for screwing the fixing portion 30 to the mounting surface. The screw hole 37 is continuous with the locking groove 35. The high step portion 36 has a larger wall thickness than the other portions and has high strength, and cracks or the like are less likely to occur due to screw tightening or the like.

On the other hand, the cover portion 3 of the piping duct 30
8 has a substantially arc-shaped cross section, and locking portions 39, 39 bent slightly inward upward are provided at both ends thereof continuously in the length direction. The interval between the tips of the locking portions 39, 39 is slightly smaller than the interval between the grooves 32, 32 of the fixing portion 31, and the cover portion is pressed while the side plates 31a, 31b of the fixing portion 31 are pushed from the outside. 38 locking portions 39, 3
9 are inserted into the grooves 32, 32, respectively.
8 is fixed to the fixing portion 31.

FIGS. 4 to 6 show the structure of a resin joint 40 of one embodiment for connecting the duct 30 for piping. This joint 40, like the duct 30 for piping,
The fixing portion 41 for fixing to the mounting surface and the cover portion 47 for covering the upper surface of the fixing portion 41 form a tubular shape having an inner diameter larger than that of the duct 30 for piping.

The fixing portion 41 is curved in a substantially U-shape so as to circumscribe the fixing portion 31 of the duct 30 for piping, and a cover portion 47 is screwed to the central portion of the inner walls of both side plates 41a and 41b. Bosses 42 and 4 with different thicknesses to stop
Two, 43, and 43 are provided upright on the front and back.

Further, a screw hole 44 for screwing the fixing portion 41 to the mounting surface is provided in the center of the bottom plate 41c of the fixing portion, and the ends of the fixing portion 31 of the pipe duct 30 are provided before and after the screw hole 44. The stoppers 45, 45 for contacting the portion and regulating the insertion position thereof are erected so as to be orthogonal to the length direction of the fixed portion 41.

Between the front and rear ends of the bottom plate 41c forming the duct receiving portion for receiving the duct 30 for piping, between the respective stoppers 45, 45, an engaging member provided on the bottom surface of the fixing portion 31 of the duct 30 for piping. A pair of locking projections 46, 46 that engage with the stop groove 35 in a non-return manner are provided upright so as to be continuous for a predetermined length in the length direction of the fixed portion.

The pair of locking protrusions 46, 46 are provided on the bottom plate 41c.
It is formed to protrude in an inverted C-shape so as to extend outward as it is further away from, and to be elastically deformed inward when its upper end is pushed from the outside.

The distance A between the pair of locking projections 46, 46 (width of the locking projections as a whole) is defined by the piping duct 30.
When the locking groove 35 is pressed from above, the respective end portions 46a, 46a are pushed inward by the guide portions 35a of the locking groove 35 and can be engaged with the locking portions 35b, 35b. Inside, the fixing portion 41 is formed so as to gradually increase from one end 46a, 46a near the stopper 45, 45 toward the other end 46b, 46b near the end of the fixing portion 41.

On the other hand, the cover portion 47 of the joint 40 is formed to have an arc-shaped cross section like the cover portion 38 of the piping duct 30, and the inner wall thereof has the boss 4 of the fixing portion 41.
Bosses 48, 4 that respectively match 2, 42, 43, 43
8, 49, 49 are provided in a protruding manner, and screw holes 50, 50, 51, 51 for screwing the cover portion 47 to the fixing portion 41 via these bosses are provided on the front and rear sides of the outer wall thereof. ing.

Next, the piping work using the piping duct 30 and the joint 40 will be described. First, the fitting 40
The fixing portion 41 is screwed into the screw hole 44 and fixed to the mounting surface. Next, the fixed portion 3 of the duct 30 for piping
One end side of 1 is pressed from above the one end side of the fixing portion 41.

By this pressing, as shown in FIG. 7A, the locking groove 35 of the fixing portion 31 on the duct side approaches the locking projections 46, 46 of the fixing portion 41 on the joint side from above. Then, when the fixing portion 31 is further strongly pressed, as shown in FIG. 7B, the upper ends of the locking protrusions 46, 46 of the joint-side fixing portion 41 are aligned with the guide portions 35a on both sides of the locking groove 35. When they abut and are pushed inward, and further, the fixing portion 31 of the duct 30 is pressed, as shown in FIG.
Engages with the locking portion 35b of the locking groove 35. In this engagement state, the locking protrusion 4 whose distance between the rising portions is A1.
6 shows an engagement state between the intermediate portions of the locking members 6 and 46 and the locking groove 35, and the outer wall surface of the locking projection and the locking portion 35b of the locking groove (inner side surface of the locking groove) abut with a weak force. It will be in the state of doing.

Here, since the width of the pair of locking projections 46, 46 is wider on the other end 46b side than on the one end 46a side, the distance between the rising portions is smaller than A1.
As shown in (a) of FIG. 8, the engagement state between the one end 46a, 46a side of the locking protrusion 2 of FIG.
There is a slight gap between the outer wall surface of 46 and the locking portions 35b, 35b of the locking groove 35.

On the other hand, the distance between the rising portions is A
The engagement state between the other ends 46b, 46b of the A3 locking projections larger than 1 and the locking groove 35 was largely deformed inward by the pressing of the locking groove as shown in FIG. 8B. The outer wall surfaces of the other ends 46b, 46b are brought into a state of strongly contacting the locking portions 35b, 35b of the locking groove 35 by the elastic return force, that is, a state of strongly pressing the inner surface of the locking groove 35, As a result, the other ends 46b, 46
The b side is in a state of being held by the inner surface of the locking groove 35 with a strong force.

Therefore, by this locking operation, the distance between the fixed portion 31 of the duct 30 and the fixed portion 41 of the joint 40 is
The bottom plates are locked in a non-separable manner such that they cannot be separated from each other, and the frictional force between the locking groove 35 and the wide portion of the locking projection 46 causes the duct for piping to the fixing portion 41 of the joint 40. The movement of 30 in the pull-out direction is also restricted.

The tip of the fixing portion 31 of the duct 30 is fixed to the stopper 45 of the joint 40 by a force stronger than the frictional force between the locking groove 35 and the wide portion (the other end 46b side) of the locking projection 46.
If it is slid in the direction and positioned, the fixing portion 31
It is connected in a state where it does not come off from the fixed portion 41 of the joint 40 even if the hand is released. The strong frictional force between the locking projection 46 and the locking groove 35 causes the end of the fixed portion 31 of the duct 30 to
Since it always occurs within the range between the end of the fixing portion 41 of the joint 40 and the stopper 45, for example, a position where the fixing portion 31 of the duct 30 is not brought into contact with the stopper 45 of the fixing portion 41 of the joint 40 Therefore, even if the fixing part 31 is separated from the hand, the fixing part 31 of the duct 40
Is not lost.

Therefore, the operator is required to use the fixed portion 3 of the duct.
There is no need to press the end of 1 by hand, while watching the bending of the middle part of the fixed part 31 of the duct 30 with both hands,
It can be screwed from any screw hole 37.

This operation can be performed on the other end side of the joint 40 in the same manner, and can be performed by one operator easily while observing the posture of the piping duct 30. When the fixing portion 31 of the duct 30 is locked to the fixing portion 41 of the joint 40, the one end 46a, 46a side of the locking projections 46, 46, which has a narrow interval, is pushed into the locking groove 35 by a weak press. Since it enters, this portion is engaged with the locking groove 35 first.
When the fixing portion 31 is pressed with a stronger force, the engaging portion serves as a guide and naturally enters the locking groove 35 from the intermediate portion of the locking projections 46 to the other end. Even when the locking groove 35 and the locking projections 46 are not visible, the locking operation can be easily performed.

In this way, the fixing portion 31 of the piping duct 30 is connected and fixed via the fixing portion 41 of the joint 40, and then the necessary tubular body is passed between the fixing portions 31 and its cover portion 3
8 is attached, and the cover portion 47 is screwed and fixed to the fixing portion 41 of the joint 40 so as to cover the surface of the end portion of the cover portion 38, and the tubular body cannot be seen from the outside, and is aesthetically pleasing. In a preferable state, the piping work of this part is completed.

[0040]

[Other Embodiments] In the above-described embodiment, the distance between the pair of locking projections 46 provided on the fixing portion of the joint (width of the entire locking projection) becomes wider toward the end of the joint. However, like the fixed portion 61 of the joint shown in FIG. 9, the other ends 62b and 62b closer to the ends of the fixed portion 61 than the ends 62a and 62a closer to the stopper 45 are closer to each other. A pair of locking protrusions 62, 62 may be provided so that the distance becomes wider.

In this case, when the duct is slid with respect to the joint, the range in which the locking groove of the duct and the wide portion of the locking projection are in strong contact with each other is shorter than that in the above embodiment. However, since the gap between the locking projections near the end of the fixing portion of the joint is narrow, the fixing portion 31 on the duct side as in the above embodiment is provided.
Without being pressed against the fixing portion 41 on the joint side, the locking projections 62, 6 are inserted into the ends of the locking grooves 35 of the duct 30 as shown in FIG.
By inserting the other ends 62b, 62b of the second and sliding the fixing portion 31 of the duct against the fixing portion 61 of the joint until it comes into contact with the stopper 45, the duct and the joint are separated from each other in the same manner as in the previous embodiment. It can be linked to no state.

In addition, in the above-mentioned embodiment, 1 provided on the joint side
The distance between the pair of locking projections is designed to be continuously extended along the length direction thereof, but as in the fixing portions 71, 71 'of the joint shown in FIGS. 11 (a) and 11 (b), Wide portions 72a, 72a may be provided in parallel on one end side (may be an intermediate portion) of the pair of parallel locking protrusions 72, 72, which is wider than the other portions. In this case, the locking groove and the locking projection are engaged with each other by pressing the fixing portion of the duct against the fixing portions 71 and 71 '.

Further, in the above-mentioned embodiment, the fixing portion 31 on the duct side is provided with the hooking groove having a drum-shaped cross section, and the hooking protrusion protruding in the inverted V shape so as to engage with the hooking portion. Although provided on the joint side, the shapes of the locking groove and the locking projection are not limited to this embodiment, and various modifications are possible.

For example, as shown in FIG. 12 (a), an engaging portion is provided with an engaging groove 80 having a circular cross section on the duct side, the joint side has a spherical or cylindrical upper portion and a slit in the middle thereof. The locking projections 85 may be provided, and in addition, as shown in FIGS. 12B to 12E, locking projections 86 to 89 corresponding to the cross-sectional shapes of the locking grooves 81 to 84 are respectively provided. be able to.

The modification shown in FIG. 12 can be locked by the pressing method and the sliding insertion method as in the above-described embodiment. Further, it is possible to eliminate the gap between the pair of locking projections 46, 46 of the above-described embodiment,
Gap 85a-8 of each locking projection 85-89 shown in FIG.
If 9a is filled as shown by a broken line, there is an advantage that the strength of the locking projection is increased and the projection is not damaged. However, in this case, since the elasticity of the locking projection itself is lost, only the wide part of the locking projection is formed so as to be elastically deformable inward, or the inner wall side of the locking groove on the duct side is moved outward. It may be elastically deformable.

Further, in the above embodiment, the engaging groove is provided in the bottom of the duct for piping, and the engaging projection engaging with the engaging groove is provided on the joint side. However, for example, in FIG. ), As shown in FIG.
92 are provided in parallel, and a locking groove 96 is provided on the fixing portion 95 side of the joint.
May be provided. In this case, as shown in FIG. 13B, the ribs 97 forming the locking groove 96 are provided.
If the interval is formed so as to become narrower toward the end portion side of the fixed portion 95, the movement of the duct with respect to the joint can be regulated as in the above embodiment, and conversely, in FIG. As shown in c), the distance between the ribs 97, 97 is set to the fixing portion 9
If it becomes wider toward the stopper 45 side of 5,
Locking by slide insertion becomes easy. Also in this case,
The ribs 97, 97 forming the locking groove 96 may be elastically deformed outward, and the locking projection 92 side may not be elastically deformed, so that the ribs 97 and 97 engage with each other in a non-returning manner. Of course, at that time, the gap between the locking protrusions 92 may be filled.

In the above embodiment, the present invention is applied to a joint for connecting piping ducts in a straight line. However, a joint for connecting piping ducts at an angle or ducts having different thicknesses are used. The present invention can be applied to a joint for connection, a joint in which a duct is connected only at one end side, and the other end side is connected to a passage other than the duct.

Further, in the above-described embodiment, the present invention is applied to the duct for piping in which the fixing portion and the cover portion are separated, but the fixing portion and the cover portion are formed as an integral duct, and another fixing member is used. The present invention can be similarly applied to a duct or a joint that is fixed to a mounting surface or the like.

[0049]

As described above, in the connecting mechanism for connecting the duct for piping and the joint of the present invention, the engaging groove or the engaging projection provided in the duct with a predetermined width is provided in the engaging groove provided in the joint. Alternatively, the locking projections are engaged with each other in a non-reverse manner to restrict movement of the inner wall of the joint and the outer wall of the duct in a direction in which they are separated from each other, and a wide portion provided in a part of the locking projection on the joint side or Since the narrow portion provided in a part of the locking groove and the side surfaces of the locking groove or the locking projection on the duct contact each other, the movement of the duct in the pulling direction with respect to the joint is regulated. When attaching the duct for piping to the wall surface via the joint, the movement of the duct with respect to the joint is restricted by simply locking the locking groove and the locking projection to each other, and one end of the duct can be manually fixed as in the past. There is no need to press down, and the work of fixing the piping duct Simple, yet, can be carried out so as not to impair the appearance.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a piping duct according to one embodiment.

FIG. 2 is a view of a piping duct according to one embodiment as viewed from an end face side.

FIG. 3 is a bottom view of the piping duct according to the embodiment.

FIG. 4 is an exploded perspective view of a joint according to an embodiment.

FIG. 5 is a front view of the joint of the embodiment.

FIG. 6 is a plan view of a fixing portion of the joint according to the embodiment.

FIG. 7 is a view for explaining the work of attaching the duct for piping to the joint of one embodiment.

FIG. 8 is a diagram for explaining the difference in the engagement state with respect to the difference in the front and rear positions of the locking protrusions.

FIG. 9 is a plan view of a joint according to another embodiment of the present invention.

FIG. 10 is a perspective view illustrating an operation of attaching a piping duct to the joint of FIG. 9;

FIG. 11 is a diagram showing a modified example of the main part of the present invention.

FIG. 12 is a diagram showing a modified example of the main part of the present invention.

FIG. 13 is a diagram showing a main part of another embodiment of the present invention.

FIG. 14 is an exploded perspective view showing a conventional duct for piping.

FIG. 15 is an exploded perspective view showing a conventional joint corresponding to the duct for piping of FIG.

FIG. 16 is a view for explaining a conventional installation work of a piping duct and a joint.

[Explanation of symbols]

 30 Piping duct 31 Fixed part 35 Locking groove 37 Cover part 40 Joint 41 Fixed part 46 Locking protrusion 47 Cover part

Claims (2)

[Claims] 1. A tubular pipe duct for supporting along a wall surface in a state where the pipe body is inserted therein, and for receiving an end portion of the pipe duct inside and connecting it to another passage. A coupling mechanism for coupling a tubular joint to each other, wherein a locking groove having a predetermined width is formed on at least an outer wall of the pipe duct so as to be continuous in the longitudinal direction of the pipe duct. And on the inner wall of the duct receiving portion of the joint projecting so as to be continuous in the longitudinal direction of the joint with a width close to the width of the locking groove of the piping duct, and received by the duct receiving portion of the joint. A locking projection that engages with the locking groove of the piping duct in a mutually non-reversible manner and restricts movement of the inner wall of the joint and the outer wall of the end of the piping duct in a direction in which they are separated from each other. The engaging protrusion can be engaged with the engaging groove. Wider than the other portions within the range, and presses the inner side surface of the locking groove in a state of being engaged with the locking groove to restrict movement of the pipe duct with respect to the joint in the removal direction. A connecting mechanism between a duct for piping and its joint, which is provided with a section. 2. A tubular pipe duct for supporting along a wall surface in a state where the pipe body is inserted therein, and for receiving an end portion of the pipe duct inside and connecting it to another passage. A coupling mechanism for coupling a tubular joint to each other, wherein a locking projection of a predetermined width is formed on at least an outer wall of the pipe duct so as to be continuous in the length direction of the pipe duct. And the inner wall of the duct receiving portion of the joint is formed so as to be continuous in the longitudinal direction of the joint with a width close to the width of the locking projection of the piping duct, and is received by the duct receiving portion of the joint. A locking groove that engages with the locking projection of the pipe duct in a non-reverse manner to restrict the movement of the inner wall of the joint and the outer wall of the end of the pipe duct in the direction of separation. However, the engagement with the engagement projection is not engaged with the engagement groove. It is formed to be narrower than the other portions within the effective range, and presses the outer surface of the locking projection in a state of being engaged with the locking projection to prevent the pipe duct from moving in the pull-out direction with respect to the joint. A connecting mechanism between a duct for piping and a joint thereof, which is provided with a narrow portion to be regulated.