Closure apparatus incorporating a magnetic clutch for screwing-on a plastic screw closure
US4364218A · kind A · utility
24Cited by
9References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1980 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | Apr 25, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D7/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetic clutch is provided for transmitting and limiting the torque in screw-on heads for screw closures. The clutch has a high number of poles (at least eight and preferably twelve poles) and the spacing between the clutch magnets, is at least six times the total axial tolerances between the clutch magnets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.