Twist-type spring clip

Claim 1

A spring clip formed of springy wire bent to a generally Ushaped form with a rounded bight at one end, a single pair of straight substantially parallel arms extending from and integral with said bight and pivot means at free ends of the arms and offset therefrom, said arms and pivot means being spaced apart for free insertion of sheet material therebetween, said pivot means engaging opposite sides of said sheet material when the arms are turned with respect to each other to twist the bight so that the arms and pivot means are urged toward each other on opposite sides of the sheet material under pressure applied by spring tension in the twisted bight, the pivot means comprising a prong at one end of one arm and a loop at one end of the other arm, said loop having a terminal leg directed at an acute angle toward said other arm, when in a clamped position said prong extending at an obtuse angle from said one arm and extending downwardly, crossing said terminal leg into said loop, said arms being of substantially common length and said prong and loop being located such that the prong penetrates the sheet material and such that the prong enters the loop when the arms are turned and the bight is twisted.