Tamper-resistant lug nut
US4427326A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1982 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | May 11, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5863
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention comprises a lug nut which has two separable portions connected by a frangible neck, wherein a first portion engages the threads of the stud, and a second portion provides a surface adapted to engage a wrench so that the lug nut may be driven into the stud. When the stud-engaging first portion has been threaded onto the stud and sufficiently tightened, continued application of torque cause the frangible, wrench-engaging second portion to shear off from the stud-engaging first portion. The stud engaging portion has an annular notch which is adapted to engage a snap ring located in the wrench-engaging portion. After the wrench-engaging portion is severed from the stud-engaging portion, the wrench-engaging portion is then reversed and positioned onto the stud-engaging portion. When so positioned, the snap ring engages the notch, which rotatably secures the wrench-engaging portion to the stud engaging portion. The wrench-engaging portion, thus acts as a cover or shroud for the stud-engaging portion, and being rotatable provides a tamper-proof cover for the stud-engaging portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.