JPH0139984Y2 - - Google Patents

Description

[Detailed explanation of the invention] ``Purpose of the invention'' (Field of industrial application) The present invention is a method that allows the connection part of water pipes buried underground to be held in an expandable and flexible manner. This relates to pipe fittings made in the following manner.

(Conventional Joint Structure) Prior to the present invention, the present inventor had developed a telescopic flexible pipe joint shown in FIG. 4. That is,
FIG. 4 is an exploded perspective view showing a joint structure that connects the water pipes 2, 2 to each other in an expandable and contractable manner. The water pipe 2 used in this structure is
As shown on the right side of the figure, a socket portion 3 was integrally formed at one end thereof. In addition, the water pipe 2
The other end was straight as shown on the left side of the figure since it was cut according to the required length. The inner diameter of the socket part 3 is one size larger than the outer diameter of the water pipe 2, so when the straight end of the water pipe 2 is inserted into the socket part 3, the straight pipe end of the water pipe 2 is inserted. A gap was formed on the outer peripheral surface of the straight tube end. However, an annular packing 4 having a semicircular cross section is housed in the socket portion 3 on its inner circumferential surface, and the inner circumferential surface of the annular packing 4 is in close contact with the straight end of the water pipe 2. Therefore, both water pipes 2, 2 were supposed to have a watertight insertion relationship with each other. Moreover, the watertight insertion relationship between the two water pipes 2, 2 through the annular packing 4 is guaranteed to some extent against relative sliding in the axial direction of the two pipes and bending in the pipe radial direction. Ta.
By the way, rings 5 and 6 that can be split into two are fixed to each of the water pipes 2, 2. Both rings 5 and 6 have I on their split surfaces.
Since the letter-shaped connecting rods 7, 7 were loosely fitted, the connection state of both water pipes 2, 2 was such that they could not come out of each other even if the water pipes 2, 2 were slid beyond the limit in the pipe axis direction. It was becoming preventable.

(Problem to be solved by the invention) When piping a raw material pipe roughly cut to a standard size as the water pipe 2, among the pipe ends of the raw material pipe,
In some cases, the end of the tube on the side where the socket portion 3 is not provided is cut to a predetermined length to make it shorter for use. The end portions of the pipes separated by such cutting vary in length from long to short, depending on various circumstances related to the location of the piping. Among the leftover pipes, it would be desirable to reuse relatively long pipes as water pipes 2. However, since both ends of each tube are straight, these tubes cannot be applied to the above-mentioned joint structure. Needless to say, the above-mentioned joint structure had to include the socket part 3 at one end of the pipe.

Incidentally, since the socket portion 3 has a complicated outer shape, it has been impossible to integrally form the socket portion 3 with anything other than a pipe made of vinyl chloride resin or iron material. That is, the conventional joint structure cannot be applied to a piping section that uses only pipes made of asbestos cement or the like. Furthermore, even in the case of a pipe made of vinyl chloride resin or iron, the manufacturing cost would naturally increase in order to form the socket portion 3.

The present invention was developed in view of the above-mentioned circumstances, and by making it possible to connect tubes with straight tube ends in an expandable and flexible manner,
The purpose of the present invention is to provide a new pipe joint (hereinafter referred to as the proposed pipe joint) that completely eliminates waste in manufacturing and use of pipes.

``Structure of the invention'' (Means for solving the problem) The gist of the proposed pipe joint is that it is a pipe joint that connects pipes with straight ends in an expandable and flexible manner, and that each pipe has two pipes at both ends. a coupling body having an outlet into which the coupling body is inserted; an annular packing disposed at the edges of both insertion openings of the coupling body; and each of the annular packings being held in a symmetrical arrangement with respect to both ends of the coupling body. a crimping bolt that tightens both of the tying rings in a direction toward each other; a connecting rod that is movably engaged with the outer periphery of the tying ring in the axial direction and the radial direction of the pipe; a fixed ring fixed to the outer circumferential surface of the pipe located outside the coupling ring and engaged and held at one end of the connecting rod, and an operating section for positioning the crimp bolt with respect to the coupling ring and fixing the fixed ring to the pipe; The positioning of the pipe is such that it is arranged in the range from the upper surface to the lower part of both sides of the pipe to be buried underground.

(Function) The main body of the coupling ring is formed as a single unit with pipe insertion ports provided at both ends thereof. Therefore, it is not necessary to form an integral socket portion at each tube end of each tube to be connected. In addition, the tube inserted into the insertion port of the coupling body can be inserted into the outer peripheral surface of the tube by tightening the coupling rings arranged at both ends of the coupling body in the direction toward each other. Since the annular packing is compressed in the radial direction, it is held watertight against the coupling body. Further, the connecting ring is engaged with and held in a movable state by a connecting rod between the fixed ring fixed to the pipe, so that it can be expanded and contracted depending on the state of mutual connection of the pipes. It is something. Furthermore, the crimping bolt for tightening the binding ring in the mutual direction and the operation part (for example, a bolt fastening part) for fixing the fixed ring to the pipe are laid in a groove dug in the ground. It is designed so that it can be operated from the top side of the pipe such as the one shown in the figure. Therefore, the connection work becomes easy, and the trench to be dug in the ground can be relatively shallow.

(Example) Hereinafter, the present invention will be explained based on the drawings showing the example.

1 to 3 all show the proposed pipe joint, in which FIG. 1 is an overall perspective view, FIG. 2 is a front view of the coupling ring 10, and FIG. 3 shows the proposed pipe joint as a second FIG. 2 is a side cross-sectional view showing a state in which the device is cut and developed along the line ABC in the figure. As is clear from FIG. 3, the pipe joint according to the present invention is capable of connecting the pipes 1 and 1, each having straight pipe ends, to each other in an expandable and contractable manner.

The proposed pipe joint includes a coupling main body 8 located in the center, annular packings 9, 9 disposed at both ends of the coupling main body 8, and coupling rings 10, 10 located on both outer sides of the annular packings 9, 9. and the conjugation ring of both sides 10,10
crimping bolts 11 for tightening the crimping bolts toward each other;
Fixing rings 13, 13 disposed on both outer sides of the binding rings 10, 10, and connecting rods 12, 12 that engage and maintain the adjoining relationship between the binding rings 10 and the fixed rings 13 in a mutually movable state. Consists of.

The coupling body 8 is a cylindrical body shaped like a drum so that its center part bulges out slightly, and the openings at both ends of the cylindrical body serve as insertion ports for the tube 1. There is. The outer bulge at the center is intended to allow the connection state of the tubes 1 to be inclined (bent) to a certain extent so that their tube axes differ from each other.

The annular packing 9 has a circular cross section and is fitted onto the outer peripheral surface of the tube 1 in a substantially tight manner.

The binding ring 10 has, as shown in FIG.
Bolt insertion holes 10b, 10b, and 10b are bored at three locations in total: a portion directly above the outer circumferential portion, and a portion inclined by 120° to the left and right of the portion directly above the portion. Further, in order not to confuse the positioning of the bolt insertion hole 10b, two protruding engaging hook portions 10c, 10c are formed on both sides of the outer periphery. First, the bolt insertion hole 10b will be explained. As shown in the upper part of FIG. 3, a crimp bolt 11 is inserted into the bolt insertion hole 10b. The crimp bolts 11 are for tightening the coupling rings 10 and 10 disposed at both ends of the coupling body 8 toward each other. Incidentally, an inner circumferential stepped portion 10a is formed on the inner circumferential surface of the binding ring 10 so as to surround one side and the outer circumferential surface of the annular packing 9. Therefore, when the coupling ring 10 is tightened in the direction toward each other as described above, the annular packing 9 is pressed against the opening edge of the insertion port in the coupling ring main body 8 with the other side surface thereof. Become. Therefore, the annular packing 9 is compressed in the direction of its inner diameter, and as a result, it comes to be tightly adhered to the outer circumferential surface of the tube 1. In this embodiment, in order to ensure that the annular packing 9 is compressed in the radial direction, the opening edge of the insertion opening of the coupling body 8 is chamfered inward. . On the other hand, engaging hook portions 10c, 10c protruding from both sides of the tying ring 10
As shown in the lower part of FIG. 3, the connecting rod 12 is engaged with the connecting rod 12. The connecting rod 12 is
This is for holding the binding ring 10 in a freely movable manner with respect to a fixed ring 13 which will be described later.

The fixed ring 13 has a first shape showing its external shape.
As is clear from comparing this figure and FIG. 4 which shows the conventional joint structure, it has a structure that is almost the same as that of the conventionally used splittable ring 5. That is, the fixed ring 13 can be divided into two parts in the vertical direction of the pipe 1, and the connecting rod 12 can be held in a freely movable state on the split surface. In addition, the reference numeral 14 shown in FIGS. 1 and 3 is a bolt (fourth
(see figure). It is important that the fixed ring 13 is fixed to the outer circumferential surface of the tube 1 so as not to slip, so the inner circumferential surface thereof may be made jagged or rough as shown in FIG. preferable. Further, although the connecting rod 12 has approximately the same external shape as a conventional one (see reference numeral 7 in FIG. 4), its length is quite short. This is because, in the proposed pipe joint, the connecting rod 12 has a connecting ring 10 and a fixed ring 13 that are adjacent to each other.
This is because it is designed to connect the two.

In the proposed pipe joint constructed in this way, the installation work for the pipes 1, 1 is normally carried out in a trench dug in the ground or the like. However, in the proposed pipe joint, the crimp bolt 11 is positioned with respect to the tying ring 10, as shown in Fig. 2, so that it is placed directly above it and at a 120° angle to both sides thereof. . Furthermore, as for the positioning of the operation part (split surface part that loosely fits and holds the connecting rod 12) for fixing the fixed ring 13 to the pipe 1, as shown in FIG. It's becoming like that. In other words, for the pipe 1 lying in a groove on the ground,
All work can be done within the range from the upper surface to the lower portions of both side surfaces. Therefore, the installation work can be easily performed, and the trench dug into the ground does not need to be deeper than the depth required to bury the pipe 1, making the piping work of the pipe 1 more efficient as a whole. That will happen.

(Study of Alternative Embodiments) The connecting rod 12 is not limited to a square rod shape, but may be changed to a round rod shape or the like. Furthermore, regarding the engaging protrusions provided on both ends of the connecting rod 12,
It is not necessary to provide this integrally with the rod portion, and it can be replaced with a combination of a hexagonal bolt and a nut, for example. Note that when a hexagonal bolt is used as the connecting rod 12 in this way, the length between the bolt head and the threaded part of the nut can be adjusted. , the arrangement interval between the binding ring 10 and the fixed ring 13 can be adjusted. That is, such adjustment means that the mutual expansion/contraction and flexibility tolerances of the tubes 1, 1 can be adjusted. Furthermore, regarding the structure of the fixed ring 13, it is not limited to a structure that can be divided into two, but may be made so that it can be divided into three or four. In this way, the configuration and shape of the proposed pipe joint can be changed as appropriate depending on the embodiment.

"Effects of the Invention" As is clear from the above explanation, according to the telescopic flexible pipe joint according to the present invention, pipes having straight pipe ends can be telescopically and flexibly connected to each other. That is, there is no need to use a tube with a socket integrally formed at the tube end. Therefore, there are no restrictions on the material of the pipe to which the proposed pipe joint can be applied. Further, the allowable flexibility angle is approximately twice as large as that when a pipe with a socket portion is connected. Furthermore, by being separated from the material pipe, relatively long pipes that would previously have been discarded can now be used as part of piping. . In addition, since there is no need to integrally form a socket portion at the end of the tube, it has many excellent advantages, such as significantly reducing manufacturing costs.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the proposed pipe joint, Figure 2 is a front view showing the coupling ring, and Figure 3 is a cross-sectional view of the proposed pipe joint along line A-B-C shown in Figure 2. FIG. 4 is an exploded perspective view of the conventional joint structure. 1... A tube with a straight end, 8...
Coupling body, 9... Annular packing, 10...
...Connecting ring, 11...Crimp bolt, 12...
...Connecting rod, 13...Fixed ring.

Claims (1)

[Scope of utility model registration request] It is a pipe joint that connects pipes with straight pipe ends in an expandable and flexible manner, and includes a coupling body having sockets at both ends into which the respective pipes are inserted, and opening edges of both sockets of the coupling main body. an annular packing disposed in the coupling body, a coupling ring that holds each of the annular packings in a symmetrical arrangement with respect to both ends of the coupling body, a crimp bolt that tightens both coupling rings in a direction toward each other, and the coupling ring. a connecting rod that is movably engaged with the outer circumference of the tube in the axial and radial directions of the tube; and a connecting rod that is fixed to the outer circumferential surface of the tube located outside the coupling ring and engaged with one end of the connecting rod. The crimping bolt is positioned with respect to the binding ring, and the fixing operation part of the fixed ring is positioned with respect to the pipe within the range from the upper surface to the lower part of both sides of the pipe to be buried underground. A telescopic flexible pipe joint characterized in that it is designed to be