Patent ID: 8347579

Claim:
A semi-butterfly connecting clamp, comprising: a bearing plate; two L-shaped clamp wings provided at two ends of a side of said bearing plate, respectively, wherein each of said clamp wings and said bearing plate form a U-shaped notch, each of said clamp wings, integrally formed, comprises: a pre-tightening plate opposite to said bearing plate and having at least one through hole; and a self-locking fastening plate connecting said bearing plate with said pre-tightening plate, wherein said self-locking fastening plate has at least two through holes, and a groove provided at an end thereof near said bearing plate; wherein said self-locking fastening plate comprises a wedge-shaped piece placed on an upper surface of said self-locking fastening plate at a position near said groove; wherein said wedge-shaped piece has an inclined upper surface and a locking bolt hole perpendicular to said inclined upper surface; wherein a concave surface of said groove facing to an opening of said groove is perpendicular to said inclined upper surface of said wedge-shaped piece; two inverse L-shaped self-locking blocks, each of which comprising: a transverse rod having a through hole; and a vertical rod, wherein a lower end portion of which is inserted into said groove and fitted within an inner wall of said groove of said self-locking fastening plate; two bolts, each of which being fastened with said locking bolt hole together through said through hole of said self-locking block; and two springs, whereby, each of said self-locking blocks is fastened with said self-locking fastening plate by each of said bolts penetrating through said through hole of said transverse rod, each of said springs and said locking bolt hole of said wedge-shaped piece.