By a News Reporter-Staff News Editor at Journal of Engineering — According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Hayashi, Mitsuaki (Kawasaki, JP); Saito, Osamu (Kawasaki, JP); Takano, Wataru (Osaka, JP); Izuno, Takaharu (Kawasaki, JP); Joko, Kenji (Yokohama, JP); Matsumoto, Hideaki (Yokohama, JP); Shirakami, Takashi (Kawasaki, JP); Fujii, Minoru (Kawasaki, JP), filed on October 14, 2013, was published online on July 5, 2016.
The assignee for this patent, patent number 9382938, is FUJITSU LIMITED (Kawasaki, JP).
Reporters obtained the following quote from the background information supplied by the inventors: “A spring washer having a spring property is known as a member that suppresses loosening of a fastener such as a screw or bolt. The loosening of the fastener is suppressed by widening the gap between the bearing surface of the fastener and the bearing surface of a member to be fastened by the spring property of the spring washer. The spring washer is usually a plain washer split at one point and twisted out of shape so that it has a spring property. The spring washer is crushed between the bearing surface of the fastener and the bearing surface of the member to be fastened, and the spring property is thereby exerted.(…)
via Patent Issued for Sprung Washer and Fixing Device (USPTO 9382938).