Closure apparatus with magnetic coupling for screwing on a plastics screw closure
US4492068A · kind A · utility
14Cited by
11References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1982 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Aug 16, 2002 |
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.