JP4697689B2 - Crossing board for athletics - Google Patents

Description

  The present invention relates to a crossing board used for track and field events such as long jump and triple jump.

  For example, in the long jump and the triple jump, the level crossing plate is buried at the same height as the surface of the runway and the sandbox on the side of the sandbox, and the end of the crossing plate on the sandbox side is used as a reference line for the measurement.

  The crossing board is a rectangular parallelepiped made of wood or other strong material according to the rules of the Japan Athletics Federation, and has a length of 1.220 m, a width of 0.200 m, and a thickness of 0.100 m.

  The conventional level crossing board 21 for athletics is made of wood, and as shown in FIG. 3, for level adjustment provided in a level crossing board box 25 embedded in a base 24 (for example, concrete) of a track paved with urethane 35 on the surface. It is fixed on the mortar 33 with a railroad crossing box box jack 31 and used in competition in the direction indicated by the arrow in such a state. In the crossing board box 25, when the sandbox side is the front side and the runway side is the rear side, a foul determination rubber plate 27 for judging a foul by a trace of a spike on the front side of the crossing board 21 is used for a crossing board box made of square material. It is fixed on the fixed base 29.

  After the competition, the foul determination rubber plate 27, the crossing plate box fixing base 29, the crossing plate box jack 31 and the crossing plate 21 are removed from the crossing plate box 25, and the upper surface is used as a runway by covering with a lid (not shown). Can be used.

As described above, the level crossing plate 21 is repeatedly attached and detached every time it is used. However, the conventional level crossing plate 21 is simply formed in a rectangular parallelepiped, so it is slippery and difficult to attach and remove.
JP 2003-205060 A JP 2002-346018 A

  Therefore, it is conceivable to provide a groove in the crossing plate as a hand-held part. However, since the crossing plate is required to have high durability because it receives an impact caused by the competitor's crossing, it is not necessary to simply provide the groove in the crossing plate. As a result, the durability of the portion provided with the thickness decreased, which was not desirable. In addition, in this case, since the influence of the moisture from the ground that oozes through the concrete and the expansion due to the water vapor in the atmosphere during storage is unevenly affected, it is easy to be distorted and easily cracked.

  An object of the present invention is to provide a railroad crossing board that solves the above-mentioned drawbacks and that can be easily attached and detached without reducing durability.

To achieve the above object, the track board for athletics according to the present invention is provided with a plurality of grooves on the front and rear surfaces of the main body made of a rectangular parallelepiped, both of which have the same shape and avoid both the ends near the center. It is characterized in that it is provided symmetrically in the left and right direction and in the longitudinal direction on the part side .

  Thus, according to the railroad crossing plate according to the present invention, it is difficult to slip because the finger can be hooked in the groove provided on the front surface of the railroad crossing plate, and attachment and removal of the railroad crossing plate are facilitated. In addition, since the crossing plate body is provided with a symmetrically and longitudinally symmetrical groove and the groove shape is the same, the external force due to the crossing and moisture is evenly distributed, so the influence on durability is low.

  Next, a crossing board for athletics according to the present invention will be described in more detail with reference to the drawings showing embodiments. For convenience, portions having the same function are denoted by the same reference numerals and description thereof is omitted.

  Reference numeral 1 denotes a wooden railroad crossing plate made of a rectangular parallelepiped, and two grooves 3 are formed on the front surface and the rear surface, respectively. The groove 3 is formed in the short (thickness) direction as shown in FIG. 1 (A), as shown in FIG. 1 (A), and in the long (length) direction, as shown in FIG. 1 (B). In addition, it is formed symmetrically at both ends avoiding the vicinity of the center. The groove 3a formed on the front surface and the groove 3b formed on the rear surface are plane-symmetric with respect to a virtual plane that divides the railroad crossing plate 1 back and forth.

  The sizes of the individual grooves 3 are, for example, 30 mm in height, 100 mm in width, and 30 mm in depth relative to the predetermined level crossing plate 1 described above, and the user's hand is easily caught.

  The crossing board 1 is installed in a crossing board box 5 as shown in FIG. The level crossing board box 5 is embedded in the base 4 of the truck whose surface is paved with urethane 15, and a level adjusting mortar 13 is provided at the bottom. The level crossing plate 1 is placed on the level adjusting mortar 13. The crossing plate 1 is fixed to the rear side of the crossing plate box 5 by a jack 11 for a crossing plate box provided in a space generated in front of the crossing plate box 5. A crossing board box fixing base 9 is placed on the front side of the crossing board box 5 so as to cover the crossing board box jack 11, and a foul determination rubber plate 7 is placed on the crossing board box fixing base 9. Is detachably mounted. The level crossing board 1 is used for competition in this state. In addition, in FIG. 2 (B), an arrow shows a run direction of a player.

  When installing the level crossing plate 1, the operator can put his / her finger in the groove 3 of the level crossing plate 1 to support it, so that the installation and installation work can be performed quickly and easily in the level crossing plate box 5 while checking the support state. Can be done.

  For the removal work after the competition, first the rail crossing board box fixing base 9 and the foul determination rubber board 7 are removed. Then, since the front surface of the level crossing plate 1 is exposed, the level crossing plate box jack 11 is loosened and removed, and then the hand is drawn into the groove 3a provided in the level crossing plate 1 to remove the level crossing plate 1 simply and safely. Can do.

  In the groove 3, the front groove 3a and the rear groove 3b have the same shape, and are provided symmetrically and laterally symmetrically on the crossing plate 1, so that the impact force at the crossing and the external force due to moisture are evenly dispersed. Low impact on durability.

  The present invention is not limited to the embodiment described above. For example, the shape of the groove itself is arbitrary, and is not limited to a rectangular parallelepiped, and may be, for example, a semi-cylindrical shape or a triangular prism shape as long as it can hold hands. Further, the corners of the grooves may be rounded. In this case, the force applied to the corners is dispersed, so that the durability is increased.

  Further, the number and position of the grooves are arbitrary. As for the position of the groove, it is desirable to avoid the vicinity of the center of the railroad crossing board because the ratio of the competitors to walk is high and the load is particularly high.

  In addition, as an example of use, a box type in which a crossing board and a crossing board box fixing base are accommodated in one space is illustrated, but a crossing board bracket, a crossing board box fixing base and a foul judgment for storing only the crossing board are illustrated. Even a cinder type provided with a foul determination rubber receiving bracket for accommodating only the rubber plate can be used. In this case, since the groove of the level crossing plate is above the frame of the bracket for the level crossing plate, the groove can be attached and removed by hand.

  The present invention is used for long jumps and triple jumps in athletics.

(A) is the front view which showed embodiment of the level crossing board by this invention, (B) is a top view of (A), (C) is a right view of (A), (D) is (B). It is DD sectional drawing. (A) is a top view which shows the usage example of a level crossing board by this invention, (B) is a longitudinal cross-sectional view of (A). These are the longitudinal cross-sectional views which show the usage example of the conventional level crossing board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Level crossing board 3a Groove 3b Groove 4 Base 5 Level crossing board box 7 Foul judgment rubber plate 9 Level crossing board box fixing base 11 Level crossing board box jack 13 Level adjustment mortar 15 Urethane 21 Level crossing board 24 Base 25 Level crossing board box 27 Foul judgment Rubber plate 29 Crossing plate box fixing base 31 Crossing plate box jack 33 Level adjustment mortar 35 Urethane

Claims (1)

In a crossing board for athletics, a plurality of grooves are provided on the front and rear surfaces of a rectangular parallelepiped main body, all of which have the same shape, and are symmetrical in the left and right sides and in the front and back symmetry, avoiding the vicinity of the center. A crossing board for athletics, characterized by being provided.

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