JPS6335045Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an instrument for measuring the length of artificial lawns.

In recent years, artificial turf has been widely used in baseball fields, tennis courts, soccer fields, competition tracks, etc. In particular, artificial turf whose grains are filled with granular materials such as silica sand have a moderate impact cushioning effect. performance and water absorption,
It is attracting attention because of its water retention ability.

However, in such artificial lawns, even if the length of the artificial lawn itself is made uniform, depending on the amount of silica sand to be filled, that is, depending on the thickness of the filling layer, the leaves that protrude above this layer may vary. The length of the tip is different. On the other hand, since the length of the leaf tip affects the bouncing characteristics of balls such as tennis balls and the sliding characteristics of spikes, etc., when constructing artificial turf, the length of the protruding leaf tip is measured and managed. However, it is necessary to form a silica sand layer almost uniformly over the entire ground.

This invention is a measuring device for measuring the protruding length of such an artificial lawn, which is selected to have a weight sufficient to cause the artificial lawn to fall over without digging into the sand, and has a ring-shaped or at least A load main body having three legs and a guide hole extending vertically from the lower surface to the upper surface, and a flat plate having a substantially flat lower surface at the lower end of a stem that is loosely fitted into the guide hole. It is characterized in that it is equipped with a measuring element having a body attached thereto.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

This measuring device consists of a load body 1 formed in a cylindrical shape.
0. On the lower surface of this load main body 10,
At least three legs 12 supporting this are arranged at approximately apex positions of an equilateral triangle. Note that the number of legs may be four or more, or may be a ring-shaped leg having approximately the same diameter as the load main body 10. The height of the legs 12 is made higher than the length of the lawn to be measured. Further, a guide hole 14 passes through the load body 10 substantially in the center in the vertical direction. This load main body 10 is adapted to have a measuring element attached thereto. In this embodiment, the probe is a disk-shaped flat plate body 1 whose lower surface is substantially flat.
6, and a stem 18 provided substantially perpendicularly to the upper surface of the flat plate body 16.
is slidably inserted into the guide hole 14 of the load main body 10. In relation to this probe, the load body 1
0 is provided with a fixing member 20. This fixing member 20 is provided in a hole that communicates with the guide hole 14 at right angles, and is configured to press the stem 18 from the side to fix the probe.

When this side measuring device is placed on an artificial lawn filled with silica sand, etc., the load body is supported by legs with a small area, so the lawn is pressed against it to form a reference surface, while the lightweight probe can be placed on a densely grown lawn. Therefore, it is held at that height without sinking into the lawn, and the length from the reference plane to this height is the protruding length of the lawn. Therefore, if a scale or the like is marked on the stem 18 of the measuring head, the protruding length of the grass can be easily measured.
At this time, if it is difficult to read the scale when placed on the lawn, it is sufficient to fix the probe using the fixing member 20 and then lift it up to read the scale. Of course, the displacement of the probe may be measured electrically by an appropriate method, such as a differential transformer.

In this way, it is preferable that the load main body 10 has a weight that can apply a sufficient load to the legs to press the lawn without digging into the filled sand. It is preferable that the plate area be large enough to be supported by the grass and light enough that the lawn will not be laid down. However, this is not necessarily exact, and if achieved to a considerable degree, a reasonable degree of reproducibility can be obtained, and based on this value, sand can be filled uniformly. Considering the ease of use as a device, the weight of the main body is 4 to 7.
Kg is common.

For example, when exercising, humans stand on their tiptoes;
The entire weight is on the toe area, which is 500 to 750
g/ ^cm2 . Therefore, the load of this value is
It is also possible to set the weight of the weight body and the area of the legs so that the weight is applied to the body. On the other hand, the measuring head is a flat plate body 16
In the case of a disc having a diameter of 20 mm, it is appropriate that the weight be 8 g or less, preferably 5 g or less.

With this measuring device, it is possible to easily measure the length of artificial lawns filled with sand, etc. within the grass grains, making it possible to fill the sand evenly and improve bounce characteristics and slippage. It becomes easy to construct and maintain artificial turf with uniform characteristics.

[Brief explanation of the drawing]

The figure is a cross-sectional view of the lawn length measuring device for artificial lawns of this invention. In the figure, 10 is a load body, 12 is a leg, 14 is a guide hole, 16 is a flat plate, and 18 is a stem.

Claims (1)

[Scope of utility model registration request] A measuring device for measuring the length of the grass protruding above the sand of an artificial lawn formed by filling sand into the grass grains, the measuring device being selected to have a weight sufficient to cause the artificial lawn to fall over without digging into the sand, and a load main body having a ring shape or at least three legs on the lower surface and a guide hole extending vertically from the lower surface to the upper surface; A lawn length measuring device for an artificial lawn, characterized in that it is equipped with a measuring element to which a flat plate body formed flat is attached.