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US 2026/0309182 A1Published application
Washer, nut, and fastening structure
AssigneeNippon Plarad Co.
InventorHiroshi Saeki
Life of this patent
Estimating the term…
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AssigneeNippon Plarad Co.
InventorHiroshi Saeki
Estimating the term…
Not only loosening can be prevented with a simple structure, and the manufacturing cost is inexpensive, but also loosening can be easily made when desired. A nut 1 is screwed into a screw rod 4 penetrating an attachment object 3 and comes into contact with an attachment surface 3a of the attachment object 3. A nut body 1a in which at least one concave portion 1b having a circular cross section is provided on a surface on the attachment object 3 side, and a steel ball 2 rollably provided in the concave portion 1b of the nut body la are provided. The concave portion 1b is an inclined surface having a flat bottom surface and having a size that allows rolling of the steel ball 2, has a depth at which the entire steel ball 2 is stored in the concave portion 1b at the rear end portion in the nut loosening direction, and has a depth at which a part of the steel ball 2 protrudes from the concave portion 1b at the tip end portion in the nut loosening direction.
A nut that is screwed into a screw rod penetrating an attachment object and comes into contact with a surface of the attachment object, the nut comprising:
A washer that is attached by being sandwiched between an attachment surface of an attachment object and a head of a nut or a bolt, the washer comprising:
Dependencies are inferred from the claim text.