Take-off board

Abstract

The invention provides a take-off board. The take-off board comprises a take-off portion, an alert board, at least one mutual-inductance sensors and an alarm device, a mounting groove extending along the length direction of the take-off portion is formed in the take-off portion, the alerting board is mounted in the mounting groove, a take-off area is limited in the rear of the alerting board, the mutual-inductance sensors are arranged below the alerting board, the upper surfaces of the mutual-inductance sensors are butted against the lower surface of the alerting board, and the alarm device is electrically connected with every mutual-inductance sensor and is configured to alarm when output voltage of one or a plurality of mutual-inductance sensors changes. The take-off board has the advantages that by means of arranging the mutual-inductance sensors, the rate of self-damaging is decreased remarkably, the risk of misjudgment and judgment omission are reduced or eliminated effectively, running of athletes cannot be affected, and judging accuracy is increased remarkably due to high sensitivity.

Description

technical field [0001] The invention relates to a springboard for long jump competitions, in particular to a springboard capable of alarming. Background technique [0002] With the rapid development of world sports and the continuous improvement of competitive levels, new and higher requirements have been put forward for referees of competitive sports. For example, in long jump sports such as long jump and triple jump, because referees lack objective and accurate judgment tools and only rely on vision and experience to make judgments, problems such as wrong judgments and missed judgments often occur. In order to solve the above problems, in some existing solutions, a conductive rubber is arranged on the rear side of the take-off area. When the conductive rubber is subjected to an external force and the alarm circuit is turned on to cause an alarm, however, the conductive rubber is easily damaged after being used for a long time, so that After deformation, it will not return...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, in some existing solutions, a conductive rubber is arranged on the rear side of the take-off area. When the conductive rubber is subjected to an external force and the alarm circuit is turned on to cause an alarm, however, the conductive rubber is easily damaged after being used for a long time, so that After deformation, it will no longer return to its original shape; it also has a hysteresis effect on deformation recovery, which is not conducive to continuous measurement and repeated use

In some other solutions, compression springs are arranged around the base, and upper contacts and lower contacts aligned with each other are respectively arranged on the lower surface of the base and the bottom of the base, but the contacts are easy to shorten due to friction. After the touch, the upper contact may not touch the lower contact, and there are also misjudgments and missed judgments

In some other existing schemes, a laser emitter infrared sensor installed above the ground is used to assist in adjudication. However, for athletes, the infrared sensor installed above the ground is a safety hazard, and the laser emitted by it is vulnerable. Misjudgment caused by external interference

Images