Tamper-resistant fastener
US8992151B2 · kind B2 · utility
6Cited by
19References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2013 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Dec 16, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B41/005
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A tamper-resistant fastener includes a non-circular drive recess optionally with a non-circular center post. Preferably the recess and center post are at least partially ellipsoidal cylinders that are concentric and aligned (i.e. they share a common major axis direction). This configuration forms a slot having preferably a substantially uniform width into which an authorized driver is inserted. The length of the major maximum dimension of the post is selected so that a circular arc tangent to the maximum radius of the post will pass closely to or intersect the minimum radial dimension of the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.