Abstract: A collapsible structure having a first fabric-covered frame defining a first side panel, a second fabric-covered frame defining a second side panel, a fabric sheet mounted on and extending along the first and second fabric-covered frames; and a plurality of frame supports mounted on the fabric sheet whereby folding of the frame supports drives the first and second side panels towards a collapsed and superimposed position, and unfolding of the frame supports drives the first and second side panels towards a spaced apart and expanded position, and wherein the first and second side panels in the collapsed and superimposed position can be twisted and folded into a compact configuration.

Abstract: A muffler washer for the draft link of a mold base including a resin made ring body and a metal ring; the metal ring being inserted into the outer wall of the ring body; the ring body being provided with sufficient compression resisting strength; and the washer being inserted to the catch of the draft link to eliminate noise generated by the catch upon hitting the mold plate.