| 摘要 |
FIELD: civil engineering. SUBSTANCE: double hook represents a clamp that may be used in civil engineering. This clamp has two elastic hooks and two stopped supports placed across. It may be open in applying small pressure by fingers and placed in a point on intersecting two appropriate rods. On releasing the clamp, its hooks comes closed again on the same rod by pulling it about another rod locked out by appropriate supports. EFFECT: high reliability. 6 dwg |
