METHOD AND DEVICE FOR DIGGING GROUND WITH SCRAPER Russian patent published in 1995 - IPC

FIELD: civil engineering. SUBSTANCE: device has bucket bottom 1.2-1.7 times enlarged in size with respect to its length, the upper part of the blades of the back wall and screen have folds bent backwards outside of the bucket as an extension of gently sloping planes of sliding of the prism of protruding. The prism is formed in beginning from the blade of the screen with the areas of minimum and moderate stresses in loose medium and moving along the gently sloping planes of sliding. The minimum level of power consumption is achieved on shavings maximum permissible in thickness in the case of the bucket preloaded with ground in 20-40% of its geometric volume. EFFECT: improved performance characteristics. 10 cl, 26 dwg