JPH0430478Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a connecting device for connecting pipes that allows adjacent connected pipes to be bent by changing their axial directions.

(Prior Art) In a pipe connecting device that enables bending by changing the axial direction of connected adjacent pipes, the pipes are constructed by forming an enlarged diameter part at one end of a straight pipe part and a flange part at the other end. , a packing is provided on the peripheral edge of the flange portion to make elastic contact with the inner circumferential surface of the enlarged diameter portion of the adjacent pipe material, and the inner circumferential surface of the enlarged diameter portion is set approximately at the widthwise center of the enlarged diameter portion on the axis. A connecting device for pipes formed as an arcuate curved surface centered on a central point is known from Japanese Utility Model Application Publication No. 178689/1989, which was previously proposed by the present applicant.

According to the above-mentioned pipe material connecting device, it is possible to easily connect pipe materials of the same configuration, and since the pipe materials can be bent freely, it is possible to circumvent obstacles and freely connect the pipe materials. be.
Therefore, it exhibits an excellent effect as a bent part of a protection pipe buried underground through which power lines, communication lines, etc. are passed.

(Problem to be solved by the invention) However, in the above-mentioned pipe connecting device, since it is the packing that elastically contacts the inner circumferential surface of the enlarged diameter part that maintains the bent state of the pipe, the power line drawn into the inside is If a force is applied to the tube to return it to a straight line, the tube will return to its straight line, and there is a risk that it will hit a nearby obstacle or be damaged.

In addition, in order to prevent the above situation from occurring, a U-shaped pedestal is provided along the bending path of the pipe material,
The bent state of the pipe material is also maintained using the pedestal, but in this case, the pedestal is fixed so that it has enough strength to maintain the bent state of the pipe material against the return force from power lines, etc. In addition, even if it becomes necessary to finely adjust the bending angle of the tube material after the pedestal is fixed, it cannot be easily handled.

(Means for Solving the Problems) Therefore, the pipe connecting device according to the present invention is a connecting device that enables bending by changing the axial direction of connected adjacent pipe materials, and is a connecting device that allows bending by changing the axial direction of connected adjacent pipe materials. A pipe material is formed by forming a diameter part and a flange part at the other end,
A packing is provided on the periphery of the flange portion to make elastic contact with the inner circumferential surface of the enlarged diameter portion of the adjacent pipe material, and the inner circumferential surface of the enlarged diameter portion is set approximately in the widthwise center of the enlarged diameter portion on the axis. In a connecting device for pipe materials formed as an arcuate curved surface centered on a central point, the diameter expanding ring has a split that forms an outward stepped protrusion that can engage with the inner circumferential surface of the expanded diameter section of an adjacent pipe material. is extrapolated to the pipe material in a positionable manner.

(Function) According to the pipe connecting device according to the present invention, after changing the axial direction and connecting the pipes in a bent shape, the diameter expanding ring inserted outside the pipe is positioned at a predetermined position to expand the diameter. The tubes can be connected by pressing and engaging the outward stepped protrusions formed on the diameter ring with the inner circumferential surfaces of the enlarged diameter portions of adjacent tubes. Therefore, even if a force is applied by a power line or the like to return the diameter ring to a straight state, the stepped protrusion of the enlarged diameter ring positioned on the tube will not engage with the inner circumferential surface of the enlarged diameter portion of the adjacent tube. Since it is bent, it will not be returned and the bent connection state will be maintained.

(Example) The present invention will be described below based on the example shown in the drawings.

First, this pipe material connecting device 1 is capable of bending by changing the axial direction of connected adjacent pipe materials 2. The tube material 2 has a short tube structure with an enlarged diameter portion 4 formed at one end of the straight tube portion 3 and an outer flange portion 6 formed at the other end. The inner circumferential surface of the enlarged diameter portion 4 has a width W of the enlarged diameter portion 4 on the axis l.
An arcuate curved surface 5 having a radius r centered on a center point O set approximately at the center of is formed. On the other hand, the flange portion 6 has an outer flange shape with an outer diameter φ' and is open in the shape of a flap, and a ring-shaped packing 7 is provided on the periphery of the flange portion 6 to make elastic contact with the inner circumferential surface of the enlarged diameter portion of the adjacent tube material 2. It has been established. The outer diameter of the packing 7 is φ
is equal to twice the radius r of the arcuate curved surface 5 described above.

The gasket 7 is assembled to the flange portion 6 and has a ring shape with a pair of seal strips 9 provided around the outer edge of the fitting portion 8 to form an example of an intervening portion. adjacent pipe material 2
When fitted into the enlarged diameter portion 4, the respective protruding end surfaces of the pair of seal strips 9 come into elastic contact with the inner circumferential surface of the enlarged diameter portion 4 and come into close contact.

The gap 10 formed between the pair of seal strips 9 is sealed by the pair of seal strips 9 and the inner peripheral surface of the enlarged diameter section 4, resulting in a kind of suction cup structure. When the packing 7 comes into elastic contact with the inner circumferential surface of the enlarged diameter portion 4, close contact is achieved extremely effectively.

The flange portion 6 and the enlarged diameter portion 4 of the adjacent pipe material 2
In the fitted portion, the inner circumferential surface of the enlarged diameter portion 4 is an arcuate curved surface 5 with a radius r centered on the center point O, and the outer diameter φ of the seal 7 of the flange portion 6 is equal to this arcuate curved surface 5.
Since the radius r is twice the radius r of Since the shapes of the tubes 5 and 5 match, when the adjacent tubes are at a certain angular position with respect to each other, the gasket 7 on the periphery of the flange portion 6 comes into elastic contact with the inner peripheral surface of the enlarged diameter portion 4, and the tubes can be connected in a bendable manner by changing the axial direction of the

In addition, when the pipe material is bent as described above, since the flange part 6 has an outer flange shape that is opened in a flap shape with respect to the straight pipe part 3, the cable 11 such as a power line passing through the inside of the flange part 6 is
is not bent sharply. Furthermore, when the bending angle of adjacent tube materials exceeds a certain level, the end edge 4a of the enlarged diameter portion 4 comes into contact with the outer surface of the straight tube portion 3 of the adjacent tube material and acts as a stopper. Therefore, the bending angle of adjacent pipe materials can be appropriately limited, and the cable 11 will not be bent beyond the permissible radius of curvature, which may cause the cable 11 to be damaged at the bend or the electrical characteristics to deteriorate. There is no. Further, due to the above-described action as a stopper, the flange portions 6 of adjacent tube members 2 do not come off from the enlarged diameter portion 4.

Straight pipe section 3 to maintain the bent state of the pipe material.
The enlarged diameter ring 12, which is inserted into a position close to the flange portion 6, is a narrow metal ring having a substantially C-shape with a split. The enlarged diameter ring 12 has one end inserted into the gap formed by the inner periphery of the enlarged diameter part 4 of the adjacent pipe material and the outer periphery of the straight pipe part 3 located in the enlarged diameter part 4. On the outer periphery of the protruding end, an outward stepped protrusion 13 that can engage with the inner circumferential surface of the open end of the enlarged diameter portion 4 of the adjacent tube 2 is provided along the axis of the adjacent tube. It is formed continuously so as to be located on a circular arc line centered at l. As is clear from FIG. 3, the stepped protrusion 13 is formed on the outside of the bent portion when the tubes 2 are connected to each other in a bent shape, that is, on the inner periphery of the enlarged diameter portion 4 of the adjacent tubes 2. The height of the central portion 13a, which is located at the point where the gap formed by the outer circumference of the straight pipe portion 3 of the pipe material 2 that protrudes into the enlarged diameter portion 4 is the widest, is the highest, and from here the left and right ends The height is gradually reduced as it approaches the portion 13b. With the above configuration, even if the bending angle at the connecting portion of the pipe material is large and the interval formed inside the bent part is extremely narrow, the stepped protrusion 13 This has the advantage that the end portion of the enlarged diameter ring 12 formed with the diaphragm ring 12 can be inserted easily.

On the other hand, three screw holes are formed in the diameter expanding ring 12 at equal intervals in the circumferential direction, and each screw hole has a length that allows the tip to come into contact with the straight pipe portion 3. A wing screw 14 having a thumb screw 14 is screwed together.
Therefore, the enlarged diameter ring 12 is positioned on the straight pipe portion 3 of the pipe material by turning the thumbscrew 14 in the tightening direction. Further, when the thumbscrew 14 is further turned in the tightening direction, the diameter expanding ring 12 gradually widens the split and expands in the diameter outward in the radial direction, and the stepped protrusion 13 formed on the outer periphery of the end thereof expands. It is pressed against the inner peripheral surface of the open end of the diameter portion 4.

Therefore, even if a force is applied to the tubing 2 to return it to a straight state when passing a power line or the like after piping, the stepped shape that is pressed against and engaged with the inner peripheral surface of the enlarged diameter portion 4 of the adjacent tubular material The enlarged diameter ring 12 provided with the protrusion 13 is positioned on the straight pipe section 3 by thumb screws 14 at three locations, and is maintained in its enlarged diameter state by the thumb screws 14, so that the connected pipe material 2 The bent state of is maintained as it is. In addition, when finely adjusting the bending angle, loosen the thumbscrew 14 to slightly reduce the diameter of the enlarged diameter ring 12, so that the stepped protrusion 13 formed on its outer periphery and the inner circumferential surface of the enlarged diameter portion 4 are adjusted. Disengage. As a result, the tube material is maintained in a bent state only by the packing that comes into elastic contact with the inner circumferential surface of the enlarged diameter portion 4, so that the degree of bending of the tube material can be finely adjusted by applying force. After making fine adjustments, tighten thumbscrew 1 again.
4 to expand the diameter of the diameter expansion ring 12, and the stepped protrusion 13 formed on the outer periphery of the ring 12 is pressed against and engaged with the inner peripheral surface of the diameter expansion part 4.

Although the present invention has been described above with reference to one embodiment of the drawings, the present invention is not limited to the embodiment described above, and may be implemented in any manner as long as the structure described in the claims for utility model registration is not changed. can do.

(Effects of the Invention) As explained above, according to the present invention, an enlarged diameter ring having a split in the outer periphery with a step-like protrusion that can come into contact with the inner peripheral surface of the enlarged diameter portion of adjacent By inserting the expanded diameter ring outwardly and expanding the diameter of the expanded diameter ring, the stepped protrusion can be pressed against the inner circumferential surface of the adjacent expanded diameter portion, so that the bent connection state can be avoided when passing power lines, etc. Even if a force is applied to restore the straight line, the bent connection state can be maintained against this force. Therefore, unlike the conventional case, there is no risk of hitting nearby obstacles or being damaged.

Moreover, unlike conventional methods, it is not necessary to provide a U-shaped pedestal along the bending path of the pipe material and maintain the bent state of the pipe material using the pedestal, and it is also possible to make fine adjustments regarding the degree of curvature. Since it is easy, the work can be done quickly and smoothly.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram with a part cut away showing a state in which the pipes are connected;
FIG. 2 is an enlarged vertical sectional view of the connecting portion, and FIG. 3 is a horizontal sectional view of the same. 2... Pipe material, 3... Straight pipe section, 4... Expanded diameter section, 6
. . . Flange portion, 7 . . . Packaging, 12 .

Claims (1)

[Claims for Utility Model Registration] A connecting device that enables bending by changing the axial direction of connected adjacent pipes, which is a straight pipe with an enlarged diameter part at one end and a flange part at the other end. A packing is provided on the peripheral edge of the flange portion to make elastic contact with the inner circumferential surface of the enlarged diameter portion of the adjacent tube material, and the inner circumferential surface of the enlarged diameter portion is aligned on the axis in the axial direction of the enlarged diameter portion. In a connecting device for pipe materials, which is formed as an arcuate curved surface centered on a center point set approximately in the center, the split part is formed with an outward stepped protrusion that can engage with the inner circumferential surface of the enlarged diameter section of the adjacent pipe material. 1. A pipe material connecting device, characterized in that a diameter expanding ring having a diameter expanding ring is inserted onto the pipe material in a positionable manner.