Plastic umbrella frames

Claim 1

AN UMBRELLA FRAME COMPRISING A NOTCH AND RIBS RADIATING THEREFROM, SAID NOTCH AND RIBS BEING INTEGRALLY MOLDED OF PLASTIC MATERIAL TO PRODUCE RELATIVELY RIGID RIBS EXCEPT AT THE ENDS THEREOF WHERE THE RIBS JOIN THE NOTCH, WHICH ENDS ARE FORMED OF REDUCED THICKNESS PRODUCING SELF-HINGE POINTS BETWEEN THE NOTCH AND SAID RIBS; EACH OF SAID RIBS BEING MOLDED WITH A LAP INTERMEDIATE THE ENDS THEREOF HAVING A BEARING PORTION AND AN OPENING LEADING FROM SAID BEARING PORTION TO THE EXTERIOR OF SAID LAP, A RUNNER, STRETCHERS MOLDED OF PLASTIC MATERIAL PIVOTALLY SECURED AT ONE END TO SAID RUNNER AND EACH HAVING THE OPPOSITE END MOLDED WITH A BEARING MEMBER, THE BEARING MEMBER OF EACH STRETCHER MAKING A SNAP FIT JOINT WITH THE BEARING PORTION OF SAID LAP.