JPH0551056U - Film winding pipe for greenhouse ventilation - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a film wind-up pipe for a greenhouse with excellent durability, which prevents rusting and breakage of the connecting portion of the pipe. [Structure] The pipe body 1 to be connected is covered with a synthetic resin layer 12 on an outer peripheral surface of a metal pipe 11 to have a circular cross section, and a connecting end is deformed into an elliptical cross section. A synthetic resin joint 2 for connecting adjacent pipe bodies 1 is formed by providing arm bodies 22 having an elliptical cross section on both sides of a collar-shaped central portion 21. Joint 2
The arm body 22 is forcedly pushed into the connection end portion of the pipe body 1 to connect the pipe bodies 1 to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a film winding pipe for ventilation of a greenhouse for agricultural and horticultural use. In general, when the temperature inside a greenhouse rises above an appropriate temperature, it is necessary to wind up a part of the film in the vinyl house and open it to ventilate the inside temperature of the house. It relates to the pipes used for film winding during ventilation.

[0002]

[Prior Art]

 Conventionally, as a film winding pipe of this type, there is, for example, the one described in Japanese Utility Model Laid-Open No. 61-125265 which was previously proposed by the present applicant. In this conventional film winding pipe, the pipe body has a circular cross section in which the outer peripheral surface of the metal pipe is covered with a synthetic resin layer, one end is gradually deformed into an elliptical cross section, and the other end has a synthetic resin layer. The metal pipe is removed to expose the metal pipe, which is gradually deformed into an elliptical cross section, and the other end of the other pipe body is directly fitted into one end of one pipe body that is connected to each other.

[0003]

[Problems to be solved by the device]

 However, in such a conventional film winding pipe, the metal pipe is scratched at the connecting portion between the pipe main bodies by cutting off the synthetic resin layer at the other end of the pipe main body with a knife etc. The deformed portion of the formed metal pipe has a problem that the surface is easily galvanized due to the rolling process, which easily causes rust and breaks.

An object of the present invention is to provide a film winding pipe for ventilation of a vinyl house, which solves the conventional problems.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a metal pipe with a synthetic resin-coated pipe body connected by a synthetic resin joint. That is, the vinyl film ventilation film winding pipe of the present invention has a plurality of pipe bodies connected through a joint, and the pipe body has a substantially circular cross section in which the outer peripheral surface of the metal pipe is covered with a synthetic resin layer. The connecting end of the pipe body is deformed into an elliptical cross-section, the joint is made of synthetic resin, and the arms with an elliptical cross-section that almost match the inner shape of the connecting end of the pipe body are formed on both sides of the collar-shaped center. The arms are extended and fitted and fixed in the connecting ends of adjacent pipe bodies.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. In the drawings, A is a film winding pipe of the present invention, which is formed by connecting a plurality of pipe bodies 1 via a joint 2.

The pipe body 1 is an elongated body having a substantially circular cross section in which a synthetic resin layer 12 is coated on the outer peripheral surface of a metal pipe 11. The end of the pipe body 1 is gradually deformed into a substantially elliptical cross section to form a connecting end. The length of the connecting end is about 2 to 5 times the inner diameter of the pipe body 1 and the cross section has an elliptical cross section. ing.

Regarding the elliptical shape of the connecting end of the pipe body 1, if the long diameter part is 1.2 times or less of the short diameter part, slippage occurs between the pipe body 1 and the pipe body 1 and the pipe body 1 rotates at the connection part. The force transmission is weakened, and if it is more than double, the metal pipe 11 is likely to be cracked or crushed during the deformation process.

The metal pipe 11 is generally circular in cross section, and the surface thereof is galvanized. As the resin forming the synthetic resin layer 12, a suitable synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride is used.

The joint 2 is made of a synthetic resin having a high thermal deformation temperature such as polybutylene terephthalate, polycarbonate, polyamide, polyethylene terephthalate, and glass fiber reinforced polypropylene in order to reliably transmit rotation at the connecting portion between the pipe main bodies 1. ing. As shown in FIG. 1, the joint 2 has arms 22 extending from both sides of a collar-shaped central portion 21. The brim-shaped central portion 21 is generally formed into an elliptical shape that substantially matches the outer shape of the connecting end surface of the pipe body 1, and does not project to the surface when the pipe body 1 is connected so as not to damage the vinyl film.

As shown in FIG. 4, the arm 22 has a substantially elliptical cross-section that substantially matches the inner shape of the connecting end of the pipe body 1. The arm body 22 has a length of about 2 to 5 times the inner diameter of the pipe body 1 similarly to the connecting end portion of the pipe body 1. For the same reason as described above, the elliptical long-diameter portion is the short-diameter portion. .2 to 2 times.

The outer peripheral surface of the arm 22 may be simply a smooth surface, but if ribs 23 are provided so as to extend along the length direction as shown in FIG. 1, the arm 22 and the pipe body 1 are Is preferable because it can be firmly fitted. The ribs 23 may be provided in an appropriate number continuously or discontinuously along the length direction, and the cross-sectional shape may be an appropriate shape such as a semicircular shape or a square shape.

In the film winding pipe A of the present invention, as shown in FIGS. 2 and 3, the arm body 22 of the joint 2 is fitted into the connecting end portions of the adjacent pipe bodies 1, and the connecting end surface of the pipe body 1 is connected to the joint 2. The plurality of pipe main bodies 1 are connected by coming into contact with the collar-shaped central portion 21.

Further, the film winding pipe A of the present invention is provided, for example, on the side surface of the vinyl house along the length direction of the house, or on the valley part of the roof of the vinyl house along the length direction of the house. The film is wound by appropriately rotating it through a rotating means.

[0015]

[Effect of the device]

 As described above in detail, in the film winding pipe of the present invention, the connecting end of the pipe body in which the outer peripheral surface of the metal pipe is covered with the synthetic resin layer is deformed into an elliptical cross section, and the above-mentioned connection of the synthetic resin joint is made. Since the arm with an elliptical cross-section that almost matches the inner shape of the end is fitted and fixed in the connecting end of the pipe body, the pipe bodies can be securely connected without idling and the connecting portion as before. There is no rusting or breakage, and the durability can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a film winding pipe of the present invention.

FIG. 2 is a plan view showing a main part of a film winding pipe of the present invention.

FIG. 3 is a cross-sectional view taken along the line II of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line Loro of FIG.

[Explanation of symbols]

 A film winding pipe 1 pipe body 11 metal pipe 12 synthetic resin layer 2 joint 21 collar-shaped central portion 22 arm 23 rib

Claims (1)

[Scope of utility model registration request] 1. A plurality of pipe bodies 1 are connected via a joint 2, and the pipe body 1 has a substantially circular cross section in which an outer peripheral surface of a metal pipe 11 is covered with a synthetic resin layer 12. The connecting end portion of 1 is deformed into an elliptical cross section, the joint 2 is made of synthetic resin, and the arms having a substantially elliptical cross section that substantially match the inner shape of the connecting end portion of the pipe body 1 on both sides of the collar-shaped central portion 21. A film windup pipe for ventilation of a vinyl house, in which 22 are extended and the arms 22 are fitted and fixed in the connecting ends of the pipe bodies 1 adjacent to each other.