US3875985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for fixing bolts and nuts
Assignee: Koyo Seiko Co Ltd
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Filing: 1973-12-07
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Granted: 1975-04-08
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Expires: 1993-12-07
Abstract
Abstract The device is a combination of a plate designed to lock a bolt or a nut against rotation and a member adapted to prevent disengagement of the plate. The plate is formed with a hole equal in shape to a bolt head or a nut, and is formed with edges each adapted to be laid in contact with the side of a stepped portion of the member to which the bolt or nut is fastened. By insertion of the holed plate around the bolt head or nut, one of the edges comes into contact with the lateral side of the stepped portion and then the check member adapted to protect the plate against disengagement is fixed to the bolt head or nut.
Inventors
- 👤 Hiroji Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:06
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/02; F16B39/10; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/974
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
213 words
A holding device for fixing either a bolt head or nut having an outer peripheral portion concentric with their axes and mounted on a fixed member having a stepped portion side, said holding device comprising a rotation locking plate having a central opening of the same shape as said peripheral portion of the bolt head or nut and having internal sides dimensioned to be matingly fitted over the bolt head or nut to be concentric with respect to the axis of said bolt head or nut and a plurality of rotation locking outer edges defining a portion of its outer periphery, each of said locking outer edges being oriented at an acute angle with respect to its respective corresponding most closely adjacent internal side of said central opening, said acute angles between different outer edges and their corresponding sides of the central opening all being different and said outer edges all being formed at an equal distance from the center of the central opening so that one of said locking outer edges is engageable with said stepped portion side to prevent rotation of said bolt head or nut and disengagement prevention means fixed to the bolt head or the nut for preventing disengagement of the rotation locking plate from the bolt or nut.
Claim 2
Dependent Claim
213 words
A holding device for fixing either a bolt head or nut having an outer peripheral portion concentric with their axes and mounted on a fixed member having a stepped portion side, said holding device comprising a rotation locking plate having a central opening of the same shape as said peripheral portion of the bolt head or nut and having internal sides dimensioned to be matingly fitted over the bolt head or nut to be concentric with respect to the axis of said bolt head or nut and a plurality of rotation locking outer edges defining a portion of its outer periphery, each of said locking outer edges being oriented at an acute angle with respect to its respective corresponding most closely adjacent internal side of said central opening, said acute angles between different outer edges and their corresponding sides of the central opening all being different and said outer edges all being formed at an equal distance from the center of the central opening so that one of said locking outer edges is engageable with said stepped portion side to prevent rotation of said bolt head or nut and disengagement prevention means fixed to the bolt head or the nut for preventing disengagement of the rotation locking plate from the bolt or nut.
Claim 3
Dependent Claim
37 words
The invention of claim 1 wherein one internal side of said central opening formed in said rotation locking plate is parallel to the outer edge of the rotation locking plate to which it is mostly closely spaced.
Claim 4
Dependent Claim
19 words
The invention of claim 1 wherein said outer edges define the entire outer periphery of said rotation locking plate.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |