Corner point and method of manufacturing the same

Abstract

To solve the problem that there is a high risk that the user will be injured if the nail-like sharp metal fitting comes off and appears on the ground.SOLUTION: After a corner point having a cylindrical end cap 1 with a bottom and a rope 2 with its lower end inserted and fixed into the end cap 1 is inserted into a hole H drilled in the ground GL, a hole H is backfilled and the rope 2 is buried with part of its upper end exposed above ground, so that the end cap 1 is buried deep underground, and even if it is left behind, the possibility of it being exposed to the outside can be minimized, enabling that even if the end cap 1 is exposed to the outside, it has no sharp parts and will not cause serious injury such as being stabbed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a corner point to be embedded in the ground for fixing a marker serving as a landmark when drawing lines such as tracks and courts on a playground or the like to the ground, and a method for manufacturing the same.

Background Art

[0002] Conventionally, such a corner point is generally in a form in which a rope is tied to the upper end of a nail-shaped metal fitting, and the nail-shaped metal fitting is driven into the ground of a playground so that only the rope is visible for use.

[0003] As such a nail-shaped metal fitting, there are those in the shape of a hook (for example, see Patent Documents 1 and 2), those having a plurality of spiny bodies protruding obliquely upward (for example, see Patent Document 3), and the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above prior art, it is common for metal ones to be able to withstand the impact during driving. Due to aging deterioration, etc., the rope may fall off from the nail-shaped fitting, or the rope may become buried, making it impossible to visually confirm its presence. As a result, there are many cases where the unnecessary nail-shaped fittings are left on the playground. After a further period of time, the upper end of the nail-shaped fitting close to the ground may be exposed from the ground, or it may be pulled out due to an external force such as sliding. As a result, accidents where users of the playground are injured by the particularly sharp end parts occur frequently. There were problems that had to be solved, such as this.

Means for Solving the Problems

[0006] In view of the problem that in the nail-shaped pointed fittings based on the above prior art, if they come off and appear on the ground, the risk of users being injured is high, the present invention provides a corner point having a bottomed cylindrical end cap and a rope with its lower end inserted and fixed inside the end cap. After inserting it into a hole drilled in the ground, the hole is filled back, and a part of the upper end of the rope is exposed from the ground and buried. By burying the end cap deep underground, the possibility of external exposure can be suppressed to an extremely low level even if it is left behind. Even if it is externally exposed by any chance, there is no sharp part, and serious injuries such as stabbing do not occur, thus solving the above problems.

Effects of the Invention

[0007] In short, since the present invention has a bottomed cylindrical end cap and a rope with its lower end inserted and fixed inside the end cap, substantially the entire corner point is buried underground, and the end cap is completely buried deep underground. Therefore, it is possible to substantially completely prevent its appearance on the ground. Even if it appears on the ground, it is not sharp and is only about the size of a small stone. Therefore, even if a user steps on it or uses it as a mat and slides, the degree of injury can be suppressed to an extremely mild level.

[0008] A retaining portion is formed at the lower end of the rope, and the outer peripheral portion of the retaining portion is sandwiched between a fixing pipe through which the rope penetrates and is inserted into the end cap and the end cap, and the fixing pipe and the rope are fixed to the end cap with an adhesive, so that it is possible to reliably prevent the rope from coming out of the end cap.

[0009] A method for manufacturing a corner point according to claim 2, wherein after injecting the adhesive into the end cap, the lower end of the rope is inserted into the end cap, the rope is passed through the fixing pipe, and the fixing pipe is inserted and pushed into the end cap so that the outer peripheral portion of the retaining portion is sandwiched between the fixing pipe and the end cap, and the fixing pipe and the rope are fixed to the end cap by curing of the adhesive, so that the rope can be reliably and easily fixed to the end cap, and its practical effect is very great.

Brief Description of the Drawings

[0010]

Figure 1

Embodiments for Carrying Out the Invention

[0011] The corner point according to the present invention basically has a bottomed cylindrical, preferably bottomed cylindrical plastic end cap 1 and a synthetic fiber rope 2 with its lower end inserted and fixed in the end cap 1, and the entire end cap 1 and substantially the entire rope 2 are buried in the ground so that a part of the upper end of the rope 2 protrudes from the ground.

[0012] FIG. 1 is a cross-sectional view showing the usage state of the corner point according to the present invention, which includes a bottomed cylindrical end cap 1 made of vinyl chloride, a rope 2 made of polyethylene having a stopper portion 3 formed by heating and expanding at least the lower end portion and then solidifying, and a cylindrical fixing pipe 4 made of vinyl chloride that is inserted into the end cap 1 and through which the rope 2 passes. The rope 2 and the fixing pipe 4 are fixed to the end cap 1 with an adhesive 5.

[0013] Moreover, the length of the rope 2 is set such that when it is buried at the set depth, about 20 mm of the upper end portion is exposed from the ground.

[0014] Also, it is preferable that the upper end of the rope 2 is made non-detachable, for example, by heating and melting it and then solidifying it.

[0015] And the corner point according to the present invention is manufactured through the following steps. 1. After injecting the adhesive 5 into the end cap 1, insert the lower end portion of the rope 2 having the stopper portion 3 formed at the lower end into the end cap 1. 2. Pass the rope 2 through the fixing pipe 4, insert and push the fixing pipe 4 into the end cap 1, and sandwich the outer peripheral portion of the stopper portion 3 between the fixing pipe 4 and the end cap 1. 3. Fix the fixing pipe 4 and the rope 2 to the end cap 1 by curing the adhesive 5.

[0016] Next, the construction method of the corner point according to the present invention is as follows: First, drill a hole H of the set depth in the ground GL, then insert the corner point according to the present invention into the hole H, and then fill the hole H back (the cross-hatched portion in FIG. 1), so that a part of the upper end portion of the rope 2 is buried in a state of being exposed from the ground.

Explanation of Reference Numerals

[0017] 1 End cap 2 Rope 3 Stopper portion 4 Fixing pipe 5 Adhesive

Claims

1. A corner point, comprising a bottomed cylindrical end cap and a rope having its lower end inserted and fixed within the end cap.

2. The corner point according to Claim 1, wherein a retaining portion is formed at the lower end of the rope, and the outer peripheral portion of the retaining portion is sandwiched between a fixing pipe inserted into the end cap through which the rope passes and the end cap, and the fixing pipe and the rope are fixed to the end cap with an adhesive.

3. A method for manufacturing the corner point according to Claim 2, wherein after injecting the adhesive into the end cap, the lower end of the rope is inserted into the end cap, the fixing pipe is inserted into the end cap and pushed in such that the rope passes through the fixing pipe, the outer peripheral portion of the retaining portion is sandwiched between the fixing pipe and the end cap, and the fixing pipe and the rope are fixed to the end cap by curing of the adhesive.

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