JPS6121224Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a synthetic resin tube for signs with enhanced safety, which is suitable for use as poles and bars for sports and road signs, especially for poles and bars for ski competitions. Regarding.

More specifically, a coating layer with a flexibility temperature of 40°C or less, such as a coating layer of polyethylene resin, is provided around the outer periphery of a specific reinforced synthetic resin pipe, so that even if the synthetic resin pipe breaks, it will not cause harm to the human body. This relates to synthetic resin pipes for signs with enhanced safety.

Traditionally, synthetic resin pipes have a good appearance, are lightweight, and have excellent stain resistance and corrosion resistance, so bamboo materials and pipes have been used for sports, road sign poles, bars, etc.
It is widely used in place of materials such as wood. However, conventional synthetic resin pipes are simply synthetic resin pipes (hereinafter referred to as synthetic resin pipes), unlike the above-mentioned reinforced synthetic resin pipes that are generally reinforced with reinforcing plates 3. It is easy to break due to external force, and when it breaks, the broken part becomes a sharp spear-like shape, which can be blown away by strong winds or slide on the snow, causing harm to humans. These incidents occurred frequently, and improvements were especially needed in terms of safety. This improvement has had many limitations in terms of use, since for example, thick synthetic resin pipes inevitably become heavy and inconvenient to handle.

The present invention provides a safety synthetic resin pipe for signs that is lightweight, easy to handle, and has enhanced safety, which improves the above-mentioned conventional drawbacks. The present invention will be specifically explained with reference to an embodiment shown in FIG.
It has a structure in which a covering layer 2 having a softening temperature of 40° C. or less is provided on the outer periphery of a reinforced synthetic resin tube whose tip portions 4 are arranged and joined in an equilateral triangular shape.

The reinforcing synthetic resin pipe 1 used in the present invention is formed into a tubular shape with a circular outer periphery from a synthetic resin with good weather resistance, impact resistance, and rigidity. resins, vinyl chloride resins such as post-chlorinated vinyl resins, polyolefin resins such as polyethylene and polypropylene,
Synthetic resins such as ABS resins and AAS resins may be used alone or in combination. However, from the viewpoint of ease of molding, availability, mechanical strength, etc., it is preferable to use a synthetic resin containing 50% by weight or more of vinyl chloride resin. Furthermore, the outer diameter of the synthetic resin pipe 1 is preferably about
10 mm to about 40 mm, particularly preferably about 15 mm to about 35 mm, and the wall thickness is preferably about 1 mm to about 5 mm,
Particularly preferred is about 2 mm to about 4 mm.

Further, the reinforced synthetic resin pipe used in the present invention has the tips 4 of three reinforcing plates 3 arranged in a triangular shape and joined to the inner circumferential wall of the synthetic resin pipe 1, preferably arranged in an equilateral triangle shape. The thickness of the reinforcing plate 3 is preferably about 1 mm to about 4 mm.
Particularly preferred is a reinforced synthetic resin tube with a structure of about 2 mm to about 4 mm. The arrangement shape of the reinforcing plates 3 is as shown in FIG. 1 of the present invention.
Although it is possible to take an array shape of an equilateral triangle in which the tips 4 intersect with each other to form the apex, if necessary, an isosceles triangular shape, a right triangle shape similar to this, or a reinforcing plate of these shapes can be used. There is no problem even if the tip portions 4 of the tips 3 intersect with each other and do not form an apex, but are slightly separated from each other.

As a method for forming a reinforced synthetic resin pipe by joining the tip 4 of the reinforcing plate 3 to the inner peripheral wall of the synthetic resin pipe 1 that does not have the reinforcing plate 3, for example, Various methods can be used, such as a method of joining with an adhesive or the like; a method of joining by fraying a groove into which the tip 4 of the reinforcing plate 3 can fit into the inner wall of the synthetic resin pipe 1; If the material of the reinforcing plate 3 is the same as the synthetic resin of the synthetic resin pipe 1, the distal end 4 of the reinforcing plate 3 and the inner circumferential wall of the synthetic resin pipe 1 can be integrally bonded by extrusion molding or the like. It's good to be able to facilitate this.

Next, the material of the coating layer 2 provided on the outer peripheral surface of the reinforced synthetic resin pipe is not particularly limited as long as it is a synthetic resin material with a softness temperature of 40° C. or less when measured according to the measuring method of JIS, K-6745. However, the soft temperature is 40
℃ or less polyethylene, ethylene vinyl acetate copolymer,
If the coating layer 2 is made of polyethylene resin such as ethylene-acrylate copolymer, ethylene-acrylic acid copolymer, or ethylene-propylene rubber, especially ethylene-vinyl acetate copolymer resin, flexibility and mechanical strength can be improved. is strong and protects the synthetic resin pipe 1 safely, so it is suitable.

The coating layer 2 may be provided by wrapping a film or sheet of a material having a flexibility temperature of 40° C. or lower, such as an ethylene vinyl acetate copolymer resin, around the synthetic resin pipe 1, or The synthetic resin pipe 1 can be inserted into the tube, or the coating layer 2 of ethylene vinyl acetate copolymer resin and the synthetic resin pipe 1 can be coextruded.
The thickness is preferably about 0.1 mm to about 4 mm,
Particularly preferred is about 0.1 mm to about 2 mm.

As mentioned above, the safety synthetic resin pipe for signs of the present invention has a flexible temperature of 40°C on the outer periphery of the reinforcing synthetic resin pipe.
The structure includes a flexible coating layer 2 made of, for example, ethylene-vinyl acetate copolymer resin, which has strong mechanical strength.Even if the reinforced synthetic resin pipe breaks due to strong external force, the flexible coating will remain Due to the action of Layer 2, the sharp lance-shaped broken part will not scatter or slide on the snow and cause harm to the human body, so it is suitable for skis where synthetic resin pipes are particularly prone to breakage in cold weather. Pole,
It can be suitably used as a safety synthetic resin pipe for signs such as bars.

[Brief explanation of the drawing]

FIG. 1 shows an example of an embodiment of the cross section of the safety synthetic resin pipe for signs according to the present invention; FIG. 2 shows a perspective view of the safety synthetic resin pipe for signs having the cross section shown in FIG. 1. It is. DESCRIPTION OF SYMBOLS 1...Synthetic resin pipe, 2...Coating layer, 3...Reinforcement plate, 4...Tip of reinforcement plate.

Claims (1)

[Claims for Utility Model Registration] 1. The outer circumference of a reinforcing synthetic resin pipe in which the inner peripheral wall of a synthetic resin pipe 1 having a circular outer periphery and the tips 4 of three reinforcing plates 3 are arranged and joined in a triangular shape, Temperature 40℃
A safety synthetic resin pipe for signs, characterized by being provided with the following coating layer 2. 2. The safety synthetic resin pipe for signs according to claim 1, wherein the coating layer 2 is a polyethylene resin.