| 摘要 |
FIELD: sports. SUBSTANCE: investigation complex has sensors connected in pairs and switched through timer relay coils. Closing contact of first relay is connected in series with opening contact of second relay and in parallel with closing contact of second relay. Antifriction has rectangular transverse bores, each provided with slot. Base has aligned slots defining horizontal and vertical surfaces of antifriction bore and vertical surfaces in antifriction and base slots. Each single-axis rectangular rack has horizontal surfaces, lowered vertical surface and spherical necks at ends. Each paired single-axis rack is located in rectangular transverse bore. Horizontal surfaces of rack are extending on horizontal surfaces of bore with allowances for vertical surfaces of bore and base. Lowered vertical surface is disposed in antifriction slot and base slot with allowances for vertical surfaces of antifriction slot and base slot. Internal spherical necks of paired single-axis rectangular racks are arranged in opposed relation in cylindrical horizontal guide of each coupling, and their ends are spring-loaded. Platform of start thrusts is positioned at the same horizontal level with paired platform of start acceleration first step. EFFECT: simplified construction and increased efficiency in runner exercising. 10 cl, 19 dwg |
