| 摘要 |
FIELD: engineering, in particular, devices which controls vehicles. SUBSTANCE: device has light source, light receiver, and housing, which has jacket and guiding lathe which has N triangular teeth over which carriage is traveled. Carriage has U-shaped cramp which has two support, one spring- loading and one fixing rollers. In addition device has shutter and handle which is rigidly attached to carriage and is designed as parallelepiped with two blind holes, which axes are perpendicular. Pushing button is located in horizontal hole while fixer of neutral position is located in vertical hole. Light source and light receiver are mounted with space in opposite position. Said space is closed with shutter when carriage is involved in reciprocal movement when handle is pressed. Fixing roller provides possibility to fix moving carriage with shutter in precisely defined position with respect to optical pairs. Forces for movement of control handle which switches positions are moderate for operator; however for pressing roller to recesses of profiled lathes are heavy. EFFECT: increased reliability in usage due to fixation of handle in required position and prevention of its accidental movement caused by impact or vibration. 2 dwg |
