Corner point and method for manufacturing the corner point

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 embedded in the ground to fix a marker on the ground that serves as a mark when drawing lines such as tracks and courts on a sports field or the like, and a method for manufacturing the same.

Background Art

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

[0003] As this nail-like metal fitting, there can be found hook-shaped ones (for example, see Patent Documents 1 and 2), those having a plurality of spines 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 conventional technology described above, the nail-shaped fittings are generally made of metal to withstand the impact when driven into the ground. Over time, due to deterioration, the rope may detach from the nail-shaped fitting or the rope may become buried and its presence may no longer be visible. As a result, there are many cases where the unnecessary nail-shaped fittings are left behind on the sports field. After more years, the upper end of the nail-shaped fitting near the ground may become exposed, or it may be pulled out by external forces such as sliding. This has led to frequent incidents of sports field users being injured, particularly by the sharp ends, and there were problems that needed to be solved. [Means for solving the problem]

[0006] In view of the problem that nail-shaped pointed metal fittings based on the above-mentioned prior art pose a high risk of injury to the user if they come loose and become visible on the ground, the present invention solves the above problem by burying the end cap deep underground. This corner point has a bottomed cylindrical end cap and a rope with its lower end inserted and fixed inside the end cap, and after inserting it into a hole drilled in the ground, backfilling the hole, and burying it with a portion of the upper end of the rope exposed above the ground. This minimizes the possibility of the end cap being exposed to the outside even if it is left behind, and even if it is exposed to the outside, it has no sharp parts, so serious injuries such as being pricked will not occur. [Effects of the Invention]

[0007] In short, the present invention has a bottomed cylindrical end cap and a rope with its lower end inserted and fixed inside the end cap. As a result, almost the entire corner point is buried underground, and the end cap is completely buried deep underground, thus almost completely preventing it from appearing above ground. Even if it were to appear above ground, it would not be sharp and would only be about the size of a small stone, so even if a user steps on it or slides under it, the degree of injury would be kept to a minimum.

[0008] A retaining portion is formed at the lower end of the rope, and the outer circumference of the retaining portion is sandwiched between a fixing pipe, which is fitted into the end cap and through which the rope passes, and the end cap. The fixing pipe and the rope are then fixed to the end cap with adhesive, thus reliably preventing the rope from slipping out of the end cap.

[0009] The method for manufacturing a corner point according to claim 2 involves injecting the adhesive into the end cap, inserting the lower end of the rope into the end cap, passing the rope through the fixing pipe, fitting and pushing the fixing pipe into the end cap, sandwiching the outer circumference of the retaining portion between the fixing pipe and the end cap, and fixing the fixing pipe and the rope to the end cap by the hardening of the adhesive. This method has great practical advantages, such as enabling reliable and easy fixing of the rope to the end cap. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view showing the usage state of the corner point according to the present invention. [Modes for carrying out the invention]

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

[0012] Figure 1 is a cross-sectional view showing the usage state of the corner point according to the present invention, and comprises a bottomed cylindrical end cap 1 made of polyvinyl chloride, a polyethylene rope 2 having a retaining portion 3 which is deformed and solidified by heating and expanding at least its lower end, and a cylindrical fixing pipe 4 made of polyvinyl chloride which is fitted into the end cap 1 and through which the rope 2 passes, and the rope 2 and fixing pipe 4 are fixed to the end cap 1 with adhesive 5.

[0013] Furthermore, the length of rope 2 is set so that when buried at the specified depth, approximately 20 mm of the upper end is exposed above the ground.

[0014] Furthermore, it is preferable to prevent the upper end of rope 2 from melting, for example, by heating and melting it and then solidifying it.

[0015] The corner point according to the present invention is manufactured by the following process. 1. After injecting adhesive 5 into the end cap 1, insert the lower end of the rope 2, which has a retaining portion 3 formed at its lower end, into the end cap 1. 2. Pass the rope 2 through the fixing pipe 4, then insert the fixing pipe 4 into the end cap 1 and push it in, so that the outer circumference of the retaining part 3 is sandwiched between the fixing pipe 4 and the end cap 1. 3. The adhesive 5 hardens, securing the fixing pipe 4 and rope 2 to the end cap 1.

[0016] Next, the construction method for the corner point according to the present invention involves first drilling a hole H of a set depth at ground level (GL), then inserting the corner point according to the present invention into the hole H, and then backfilling the hole H (cross-hatched area in Figure 1), so that a portion of the upper end of the rope 2 is embedded while exposed above the ground. [Explanation of symbols]

[0017] 1 End cap 2 ropes 3. Retaining part 4. Fixing pipe 5. Adhesive

Claims

1. A corner point comprising a bottomed cylindrical end cap and a rope with its lower end inserted and fixed inside the end cap, wherein a retaining portion is formed at the lower end of the rope, the outer circumference of the retaining portion is sandwiched between a fixing pipe, which is fitted inside the end cap and through which the rope passes, and the end cap, and the fixing pipe and the rope are fixed to the end cap with adhesive.

2. A method for manufacturing a corner point according to Claim 1, A method for manufacturing a corner point, characterized by injecting the adhesive into the end cap, inserting the lower end of the rope into the end cap, passing the rope through the fixing pipe, fitting and pushing the fixing pipe into the end cap, sandwiching the outer circumference of the retaining portion between the fixing pipe and the end cap, and fixing the fixing pipe and the rope to the end cap as the adhesive hardens.

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