RU2559866C1 - Device for measurement of range of horizontal jumps in track and field athletics - Google Patents

Abstract

FIELD: instrumentation.

SUBSTANCE: device for measurement of range of horizontal jumps in track and field athletics consists of two laser devices one of which is installed on the carriage with reflector moving on a bed along a sandpit, and another one is a range finder which is located near the bar for pushing away and sending a laser beam to the reflecting plate located on the carriage.

EFFECT: improvement of accuracy of measurement of range in horizontal jumps.

4 dwg

Description

The invention relates to measuring technique and can be used in athletics mainly for measuring long jumps and triple jumps.

Horizontal jumps in athletics are carried out in a special sector, where there is a runway (up to 45 meters), a board for repulsion and an athlete’s landing place (“pit” with sand). After the athlete fled and made the jump, he lands in the sand and thereby leaves a mark on it. The range of the jump is measured from a specific place on the push board to the nearest point on the sand left by the athlete during the landing.

Measuring the distance of the jump is carried out using a variety of methods, the most common of which is roulette - a measuring tape on which the markings are applied, indicating millimeters, centimeters and meters. The measuring tape of the roulette can be made of both hardened thin steel and woven material or fiberglass [1].

The measurements are carried out by two judges, one of whom applies the roulette’s zero mark to the footprint in the sand nearest the repulsion site, and the other stretches the roulette to a special mark on the repulsion board, where the result is read.

However, the error with this method of measurement is very large, because its accuracy depends on the correctness of setting the roulette zero at the touchdown point. Also, the measuring tape of the roulette during the measurement of the jump can sag (which increases the result) or, conversely, be excessively stretched (which reduces the result), its unwanted contact with the trace of the athlete landing in the sand also occurs. The measurement itself takes quite a long time, and its result is reported by the judge, who is in the landing zone at a distance of 6-18 meters from the senior judge.

Known laser computer meter "hawk eye", which was first used when measuring long jump and triple jump at the World Championships in Athletics in 2013 in Moscow [2].

However, the measurement by this device is carried out by a judge located under the roof of the stadium. The chief referee, the senior referee on sight, the other referees cannot be held responsible for the correctness of the measurement, and athletes and team representatives are unable to file an immediate protest against the measurement incorrectly, since the measurement process is not visible. The complexity and high cost of this system also do not allow it to be used in most competitions in long jumps and triple jumps.

A known method of measurement using an optical device moving on a carriage with a measuring tape mounted on the frame along the landing pit. This device was first used at the Olympic Games in Mexico City in 1968, then it was used at the Youth Olympic Games in 1998 in Moscow and the Youth Games of the Baltic States in 2002 [3]. The speed of measurement, the lack of direct impact on the athlete’s footprint in the sand, ease of operation distinguish this method of measurement from other devices.

However, poor vision of the athlete’s landing place through the optical eyepiece, the inability of the senior judge to control the correct movement of the carriage with the eyepiece in the frame, the inability of athletes and team representatives to see errors in the measurement do not allow the full use of this meter in most competitions.

The closest in technical essence to the claimed invention for measuring the distance of horizontal jumps is the use of equipment that over the past decades has been used at all Olympic Games, World and European Championships in Athletics. This equipment consists of a laser meter and a prism, which is installed in a hole with sand in the track closest to the repulsion site left by the athlete [4].

Distinctive features of this device is that it can significantly improve the accuracy of measuring jumps, the senior judge controls the accuracy of the announcement of each result. The device itself is connected to a computer.

However, the measurement accuracy in this case also depends on the correctness of setting the zero mark at the touchdown point, and an undesirable contact of the prism with the track in the sand also occurs. The device itself is expensive equipment, difficult to install and maintain.

The objective of the invention is to quickly, accurately and reliably reproduce range measurements in horizontal jumps.

The problem is solved using two laser devices, one of which is mounted on a carriage with a reflector moving along the bed and leaving a laser mark on the sand in the form of a strip passing across the entire width of the landing pit. Another laser device (range finder) is mounted motionless in the area of the push bar directly next to the head judge in the view.

A general view of the device is shown in FIG. 1, where 1 is a laser rangefinder; 2 - stand for range finder; 3 - stands under the bed; 4 - bed on which the carriage moves with a laser device and a reflector for the range finder; 5 - laser device; 6 - carriage on which the laser device and the reflecting plate are fixed; 7 - reflective plate.

The laser device 5, which moves along the bed 4 with a moving carriage 6 and a reflective plate 7 (Fig. 2), turn on only after the athlete has landed on the sand and left a mark. This device is led to the track 9 closest to the repulsion site, the line 8 visible to everyone appears on the sand, which the laser beam leaves.

The laser device 5 is attached to the platform 10, which is located on a moving carriage 6 with a reflective plate 7 (Fig. 3).

A device for measuring the distance of horizontal jumps has recently been successfully used in several athletics competitions (Fig. 4).

Case Studies

As soon as the athlete has made the attempt, the judge, after the command of the senior judge, turns on the power of the device and begins to move the carriage along the bed, trying to align the laser line with the track closest to the repulsion site, which he left during the jump. The senior judge, seeing that this procedure is completed, clicks on the corresponding button on the rangefinder. The rangefinder emits a laser beam that hits a reflective plate located on the carriage. The result appears immediately on the display of the rangefinder. Since the reflecting plate is shifted by 40 cm on the carriage, the stand for the rangefinder is also shifted by 40 cm, so the senior judge can be on the repulsion line without interference and control the entire measurement process.

Measurement accuracy (up to 0.1 mm), measurement speed (5-10 sec), ease of operation of the inventive device, lack of mechanical impact on traces in the sand, the ability for athletes to visually observe and control the correctness of the measurement, the visibility and reliability of the results are all this allows you to use this device in competitions at any level - both at school and at the Championships of Russia and international competitions.

Literature

1. Athletics, 2nd Edition, Under the General Ed. N.G. Ozolina and D.P. Markova, Moscow: "Physical Culture and Sports", 1972, 671 p.

2. .13 / 20130813 / 679494616.html

3. Makienko V.V. A technique for teaching the technique of long jump with a take-off run: Methodological manual. - Kaliningrad: Publishing house of KSU, 1998. - 25 p.

4. Athletics: Textbook / M.E. Kobrinsky [et al.]; Under the total. ed. M.E. Kobrinsky, T.P. Yushkevich, A.N. Konnikova.

Claims (1)

A device for measuring the distance of horizontal jumps in athletics using a laser meter, characterized in that it consists of two laser devices, one of which is mounted on a carriage with a reflector moving along the frame along the hopping hole, and the other is a range finder located in the area of the bar for repulsion and directing the laser beam into the reflective plate located on the carriage.

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