| 摘要 |
FIELD: devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks, particularly anti-mudflow measures. ^ SUBSTANCE: annunciator has elongated receiving part located at height corresponding to mudflow passage height and extending obliquely to mudflow bed. The receiving part is secured to fixed supporting post and may rotate in direction of mudflow bed inclination so that annunciator terminals may be closed. The receiving part is provided with return mechanism to return the receiving part into initial position after mudflow passage. The return mechanism may be created as tension spring or torsion spring. ^ EFFECT: increased reliability due to possibility to repeatedly warn of possible descending of mudflow. ^ 7 cl, 6 dwg |
