JPH062771Y2 - Telescopic riser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a telescopic riser, and more specifically, an telescopic riser that allows an upper tube to be easily fixed at an arbitrary position without damaging the tube. Regarding

(Prior Art and Problems) The telescopic riser with a sprinkler attached to the tip can be adjusted in the watering position according to the growth of plants, and is therefore widely used in tea fields and orchards. In addition, telescopic risers are often used for irrigation, fertilization, spraying pesticides, etc.

In the expansion / contraction riser used for such a multipurpose purpose, an upper pipe connected to a mother pipe communicating with a water supply source is nested in a lower pipe, and a sealing member is arranged between both pipes.

The sealing member is in contact with the outer peripheral surface of the upper tubular body, and the lifting and lowering of the upper tubular body causes the sealing member to have a sliding relationship with the outer peripheral surface of the upper tubular body. Therefore, if the outer peripheral surface of the upper tubular body is damaged, the seal member is damaged and the watertight effect is lost. Therefore, the means for fixing the upper pipe body to the lower pipe body at an arbitrary position should not damage the outer peripheral surface of the upper pipe body. or,
It is desired that the fixing of the upper tube to the lower tube at any position is simple and reliable.

(Problems to be solved by the invention) Then, the connecting tube is screwed into the lower tube body, and the split ring (with an outer peripheral surface taper) surrounding the outer peripheral surface of the upper tube body is tightened with the connecting tube and the cap nut. There have been attempts to secure the tube to the upper tube. However, since the tightening force of the cap nut acts as a large load locally on the outer peripheral surface of the split ring taper and acts on the outer peripheral surface of the upper tube, partial deformation occurs in the outer peripheral surface of the upper tube. This causes damage to the seal member.
Further, when the cap nut is unfastened, the connecting cylinder rotates together, which causes the lower pipe body to come off from the connecting cylinder and the mother pipe.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

(Means for Solving the Problem) In order to solve the above-mentioned problems, the present invention fixes a connecting tube with a seal member to a lower tube and fixes a tube gripping member with a split ring to the connecting tube. Basically, a means for fixing the upper and lower tubular bodies in a fixed relationship by tightening the abutment of the gripping member is used.

Specifically, the present invention relates to a connecting tube having a lower pipe body 5 connected to a mother pipe 7 communicating with a water supply source, and a seal member 9 fixed to the tip of the lower pipe body 5 and on the inner peripheral side. 2, an upper pipe body 4 which is inserted into the lower pipe body 5 through the inside of the connecting pipe 2 and has a sprinkler head 6 on the upper portion thereof, and a sealing member 9 of the connecting pipe 2 is in close contact with the outer peripheral surface of the upper pipe body 4. Further, an annular pipe gripping member 3 having a split ring 13 located above the connecting cylinder 2 and surrounding the upper pipe body 4, and a fitting port 14 for fastening the split ring 13 to the upper pipe body 4, Also, there is provided a telescopic riser having means 11, 20, 21 for connecting the connecting cylinder 2 and the pipe gripping member 3, and the split ring 13 is located at the step of the inner peripheral surface of the pipe gripping member 3. .

(Function) The connecting cylinder with the seal member and the pipe gripping member with the split ring are fixed to the lower pipe body, and the upper pipe body penetrating the split ring is brought into close contact with the split ring by bringing the mating port of the pipe gripping member close to each other. Then, it is fixed to the lower tube body through the split ring, the tube gripping member and the connecting tube.

(Example) The means of this invention is demonstrated in detail by an Example.

As shown in FIGS. 1 to 3, the lower pipe body 5 constituting the expansion / contraction riser 1 is connected to a mother pipe 7 connected to a water supply source, and via a connecting pipe 2 screwed onto the upper portion of the upper pipe body 4. The upper tube body 4 is inserted into the lower tube body 5 in a telescopic manner. A water sprinkler 6 such as a sprinkler is provided at the tip of the upper pipe body 4 to discharge the water supplied from the mother pipe 7 through the water sprinkler 6.

The connecting cylinder 2 screwed onto the outer peripheral surface of the upper portion of the lower tubular body 5 has a cylindrical stepped inner wall surface, and a packing 9 is arranged in an annular groove 8 at a proper position. The connecting cylinder 2 has a female screw portion 10 which is screwed with a male screw portion provided on the upper outer peripheral surface of the lower pipe body 5 at the lower part of its inner wall surface, and the connecting pipe 2 is screwed by screwing both screw portions. 5
Fixed to.

The tube gripping member 3 is arranged at the end of the connecting tube 2 on the side where the upper tube body 4 is inserted. The pipe gripping member 3 has a cylindrical stepped inner wall surface, and the upper tubular body 4 is provided on the stepped portion of the cylindrical inner wall surface.
The split ring 13 for gripping is arranged.

The main body of the pipe gripping member 3 has a downward cup shape and has an abutment portion 14. A projecting piece 14 ′ that is opposed to and spaced apart from the facing outer wall surface that constitutes the abutment portion 14 is extended outward, and a stopper 15 is provided on one projecting piece 14 ′. The stopper 15 regulates the approaching amount of the abutment portion 14. Both projecting pieces 14 ′ and 14 ′ can be tightened with a wing nut 18 and a bolt 19. It is preferable to provide a stopper 15 at the abutment portion 14 of the pipe gripping member 3 for preventing overtightening. Further, the connecting portion 16 is projected downward from the outer peripheral surface of the other end of the facing portion 14 of the pipe gripping member 3, and the protruding piece 11 is provided on the outer peripheral surface of the connecting cylinder 2. And the connecting portion 16 are opposed to each other and are detachably fixed with a bolt 20, a nut 21, and the like. When the nut 21 is rotated and tightened, it is preferable to make the head of the bolt 20 hexagonal and to provide the rib 16 ′ of the same shape on the connecting portion 16 in order to prevent the bolt 20 from turning together. When the upper tube body 4 is inserted into the connecting cylinder 2 via the tube gripping member 3, the packing 9 and the outer peripheral surface of the upper tube body 4 are in water-tight contact. By tightening the projecting pieces 14 ′, 14 ′ of the pipe gripping member 3 with the bolts 19, the wing nuts 18 and the like, the joint of the split ring 13 is closed and the diameter is reduced, and the upper pipe body 4 is firmly gripped and prevented from coming off. . By rotating the wing nut 18 a half turn, the inner peripheral processed portion 12 of the pipe gripping member 3 is subjected to circular processing so that it becomes a perfect circle. The inner diameter when the abutment of the split ring 13 is closed is smaller than the outer diameter of the upper pipe 4, and the outer diameter when the abutment is closed is smaller than the inner diameter of the pipe gripping member 3 when the abutment portion 14 of the pipe gripping member 3 is closed. It needs to be big. When the wing nut 18 is rotated and tightened, the head of the bolt 19 is preferably hexagonal in order to prevent co-rotation of the bolt 19, and the elongated slit-shaped rib 17 is preferably provided.

The tube gripping member 3 is preferably made of an aluminum alloy or the like having properties of elasticity, light weight, and corrosion resistance. Split ring 13
The material is preferably a soft synthetic resin such as Duracon having corrosion resistance and high mechanical strength, and the packing 9 is preferably U packing.

From the state shown in FIG. 1, for example, when trying to raise the upper tube body 4, when the wing nut 18 is loosened, the abutment portion 14 expands due to the elasticity of the tube gripping member 4, and the abutment of the split ring 13 also expands accordingly. , Separate from the upper tube body 4.
Then, the upper tube body 4 is lifted to a desired height and the wing nut 1
By tightening 8, the connection between the lower tubular body 5 and the upper tubular body 4 can be ensured again.

(Effect) The present invention has an abutment portion, a split ring in the processed portion of the inner wall surface, and simple fastening means such as bolts and wing nuts, so that the upper pipe body and the lower pipe body can be easily connected. You can Further, by loosening the tightening means, the abutment expands due to the elasticity of the pipe gripping member, so that the abutment of the split ring also expands, and the upper pipe body can be easily moved up and down or removed. Moreover, since the inner peripheral wall surface of the split ring comes into surface contact with the upper pipe body with a uniform contact pressure, the outer peripheral wall of the upper pipe body is not damaged and the packing is not damaged. The life can be extended.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a front view of a telescopic riser, FIG. 2 is a partially enlarged partial sectional view thereof, and FIG. 3 is a front view of a pipe gripping member. In the drawing: 1 ... Expansion riser, 2 ... Connection cylinder, 3 ... Pipe holding member, 4 ... Upper pipe body, 5 ... Lower pipe body, 6 ... Sprinkler, 7 ... Mother pipe, 8 ... Annular groove, 9 ... Sealing member, Reference numeral 12 ... Inner circumference processing portion, 13 ... Split ring, 14 ... Abutment portion, 18 ... Wing nut, 19 ... Bolt.

Claims (2)

[Scope of utility model registration request] 1. A lower pipe body (5) connected to a mother pipe (7) communicating with a water supply source, and an annular groove fixed to the tip of the lower pipe body (5) and on the inner peripheral surface thereof. An upper tube (2) having a seal member (9) arranged and an upper tube (6) inserted into the lower tube (5) through the inside of the connecting tube (2) and having a sprinkler head (6) on the upper part thereof. 4) and the seal member (9) of the connecting tube (2) are in close contact with the outer peripheral surface of the upper tube (4), and are located above the connecting tube (2) and surround the upper tube (4). Split ring (13), an annular pipe gripping member (3) having a fitting hole (14) for tightening the split ring (13) to the upper pipe body (4), and a connecting tube (2) and a pipe. It has means (11, 20, 21) for connecting with the gripping member (3), and the split ring (13) is of the pipe gripping member (3). Telescopic riser, characterized in that located on the circumferential surface step part. 2. The expansion / contraction riser according to claim 1, wherein the split ring (13) is made of a synthetic resin material.