JP2564233Y2 - Film hoisting pipe for greenhouse ventilation - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding pipe for ventilation of a greenhouse for agriculture and horticulture. Generally, when the temperature inside the greenhouse rises above the appropriate temperature, it is necessary to wind up some of the film of the greenhouse, open it, and ventilate it to make the temperature inside the house appropriate. The present invention relates to a pipe used for winding a film during ventilation.

[0002]

2. Description of the Related Art Heretofore, as a film winding pipe of this type, for example, Japanese Utility Model Application Laid-Open No.
There is one described in Japanese Patent No. 5265. In this conventional film winding pipe, the pipe main body is formed in a circular cross section in which the outer peripheral surface of a metal pipe is covered with a synthetic resin layer, and one end is gradually deformed into an elliptical cross section, and the other end is formed of a synthetic resin layer. The metal pipe is removed to be exposed, is gradually deformed into an elliptical cross section, and the other end of the other pipe main body is directly fitted into one end of one pipe main body connected to each other.

[0003]

However, in such a conventional film wound pipe, a metal pipe is used to cut off the synthetic resin layer at the other end of the pipe body with a cutting tool or the like at a connection portion between the pipe bodies. In addition, the exposed deformed portion of the metal pipe has a problem in that the galvanized surface thereof becomes thinner due to the rolling process, and the metal pipe is easily rusted and broken.

An object of the present invention is to provide a film winding pipe for ventilation of a greenhouse which has solved the conventional problems.

[0005]

In order to solve the above-mentioned problems, in the present invention, a metal pipe coated with a synthetic resin is connected to a pipe body by a synthetic resin joint. That is, the film winding pipe for ventilation of a greenhouse according to the present invention has a plurality of pipe bodies connected via a joint, and the pipe body has a substantially circular cross section in which the outer peripheral surface of a metal pipe is covered with a synthetic resin layer. The connecting end of the pipe body is deformed into a substantially elliptical cross section, the joint is made of synthetic resin, and an arm body having a substantially elliptical cross section substantially matching the inner shape of the connecting end of the pipe main body is formed on both sides of the flange-shaped central portion. The arm is extended, and a rib along the length direction is protruded from an outer peripheral surface of the arm, and each arm is fitted and fixed in a connection end of an adjacent pipe body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below 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 joints 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 connection end. The connecting end has a length of about 2 to 5 times the inner diameter of the pipe body 1 and is substantially elliptical in cross section, and the major axis of the elliptical shape is about 1.2 to 2 times the minor axis. ing.

With respect to the elliptical shape of the connecting end of the pipe body 1, if the major axis is less than 1.2 times the minor axis, a slip occurs between the joint 2 and the pipe body 1 rotates at the joint. If the transmission of force is weak, and if it is more than twice, the metal pipe 11 is likely to be cracked or crushed at the time of deformation processing, so the above 1.2 to 2 times is preferable.

The metal pipe 11 generally has a circular cross section, and is used whose surface is galvanized. As a resin for forming the synthetic resin layer 12, an appropriate synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride is used.

The joint 2 is made of a synthetic resin having a high heat deformation temperature such as polybutylene terephthalate, polycarbonate, polyamide, polyethylene terephthalate, glass fiber reinforced polypropylene, etc., in order to surely transmit rotation at a connection portion between the pipe bodies 1. ing. As shown in FIG. 1, the joint 2 has arms 22 extending on both sides of a flange-shaped central portion 21. The flange-shaped central portion 21 is generally formed in an elliptical shape that substantially matches the outer shape of the connection end face of the pipe main body 1, and is projected to the surface when the pipe main body 1 is connected so as not to damage the film of the greenhouse.

As shown in FIG. 4, the arm 22 has a substantially elliptical cross section which substantially matches the inner shape of the connecting end of the pipe body 1. This arm 22 is similar to the connection end of the pipe body 1,
The length is about 2 to 5 times the inner diameter of the pipe body 1, and for the same reason as described above, the major axis of the elliptical shape is about 1.2 to 2 times the minor axis.

As shown in FIG. 1, a rib 23 is provided on the outer peripheral surface of the arm 22 so as to protrude along the longitudinal direction. The number of the ribs 23 may be appropriately provided 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.

The film winding pipe A of the present invention is shown in FIG.
As shown in FIG. 3, the joint 2 is provided in the connection end of the adjacent pipe body 1.
Of the pipe body 1 are connected to each other by connecting the end face of the pipe body 1 to the flange-shaped central portion 21 of the joint 2.

The film winding pipe A of the present invention is provided, for example, along the length of the greenhouse on the side of the greenhouse, or provided along the length of the greenhouse at the valley of the roof of the greenhouse. The film is wound by being appropriately rotated through a rotating means.

[0015]

As described above in detail, in the film wound 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 almost elliptical cross section, and the joint made of synthetic resin is formed. Since the arm body having a substantially elliptical cross section substantially matching the inside shape of the above-mentioned connecting end is fitted and fixed in the connecting end of the pipe body, the pipe bodies can be securely connected without idling, and can be connected in the conventional manner. There is no rusting or breakage of the part, and durability can be improved, and since the joint is made of synthetic resin, even if it is fitted and fixed in the connection end of the pipe body, it will not damage the inner surface of the metal pipe There is no. In addition, since a rib extending along the length direction is provided on the outer peripheral surface of the arm body of the joint, the arm body and the pipe body can be firmly fitted.

[Brief description of the 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 the film winding pipe of the present invention.

FIG. 3 is a cross-sectional view taken along the line II in FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along a roll line in FIG. 2;

[Explanation of symbols]

 A Film winding pipe 1 Pipe main body 11 Metal pipe 12 Synthetic resin layer 2 Joint 21 Flange-shaped central part 22 Arm 23 Rib

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of pipe bodies 1 are connected via a joint 2. The pipe body 1 has a substantially circular cross section in which a synthetic resin layer 12 is coated on an outer peripheral surface of a metal pipe 11, and 1 is deformed into a substantially elliptical cross-section, and the joint 2 is made of synthetic resin. Arms having a substantially elliptical cross-section on both sides of the flange-shaped central portion 21 and substantially matching the inner shape of the connection end of the pipe body 1 are provided. 22 is extended and the arm 2
2. A film wind-up pipe for ventilation of a greenhouse, in which ribs 23 projecting along the length direction are protrudingly provided on the outer peripheral surface of the pipe 2, and each arm 22 is fitted and fixed in the connection end of the pipe body 1 adjacent to each other.