Lashing sling fastening buckle

An improved fastening buckle for slings and similar lashing-down straps, comprising a buckle frame, said buckle frame including a bottom plate, two opposite marginal portions of said bottom plate being angularly bent to form channels, an aperture formed in said bottom plate, said aperture extending between said marginal portions, the improvement comprising

• two bars, end sections on said bars, said end sections displaceable in said channels independently of one another to their respective end position adjacent the edges of said aperture, through which aperture are intended to be passed the ends of said sling to be clamped in position by said bars, said bars being rotatable about the respective axes thereof between sling locking and unlocking positions in response to pulling forces exerted on said sling,
• a side on each one of said bars facing said frame bottom plate,
• a first part of said bar side having a round configuration, and a second part of said bar side, adjoining said first part, having an essentially flat configuration, said flat part being at an angle to said frame bottom plate in the sling locking position, said essentially flat sides of said two bars defining planes, said planes forming an angle .alpha. relative to one another in said sling locking position, the apex of said angle pointing into said aperture, and
• stop faces on said end sections of said bars, said faces arranged to limit turning movements effected by said bars upon application of a pulling force on either end part of said sling passed about said bars.