Key Operated Folding Tube
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The folding tube minimized the unused portion of the tube by folding the tube up on itself. The tube has a series of “Self-Lock Mushroom Head Fasteners” that are embossed into the tube at preset intervals. As the tube is being used, the unused part of the tube is folding to engage the surface of the next fastener on the tube, thereby squeezing the contents out of the tube.
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Liquid ContainersSource
Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)
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