O-ring mounting for an ultra-high vacuum application. Litigation resulted in a $100,000 payment to his heirs in 1971, 19 years after his death. Christensen received a lump sum payment of US$75,000 for his efforts. During World War II, the US government commandeered the O-ring patent as a critical war-related item and gave the right to manufacture to other organizations. Despite his legal efforts, the patents were passed from company to company until they ended up at Westinghouse. Soon after migrating to the United States in 1891, he patented an air brake system for streetcars (trams). 704,463 for Hydraulic brakes, filed December 29, 1933, now U. By this slight turning or kneading action, the life of the ring is prolonged." His application filed in 1937 says that it "is a continuation-in-part of my copending application Serial No. kneads or works the material of the ring to keep it alive and pliable without deleterious effects of scuffing which are caused by purely static sliding of rubber upon a surface. made of solid rubber or rubber composition", and explains, "this sliding or partial rolling of the ring. In his previously filed application in 1933, resulting in Patent 2115383, he opens by saying, "This invention relates to new and useful improvements in hydraulic brakes and more particularly to an improved seal for the pistons of power conveying cylinders." He describes "a circular section ring. The US patent for the O-ring was filed in 1937 by a then 72-year-old Danish-born machinist, Niels Christensen. Lundberg, the inventor of the O-ring, received the patent. The first patent for the O-ring is dated May 12, 1896, as a Swedish patent. O-rings can be produced by extrusion, injection molding, pressure molding or transfer molding. The maximum recommended pressure of an O-ring seal depends on the seal hardness, material, cross-sectional diameter, and radial clearance. They have been tested to seal up to 5,000 psi (34 MPa) of pressure. O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable and have simple mounting requirements. The wide range of potential liquids and gases that need to be sealed has necessitated the development of a wide range of materials. Static applications of O-rings may include fluid or gas sealing applications in which: (1) the O-ring is compressed resulting in zero clearance, (2) the O-ring material is vulcanized solid such that it is impermeable to the fluid or gas, and (3) the O-ring material is resistant to degradation by the fluid or gas. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons. The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.
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