Thread keeper
US4279389A · kind A · utility
3Cited by
10References
6Claims
0Family size
Inventor
Key dates
| Filing date | May 19, 1980 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | May 19, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A thread keeper to prevent undesired unwinding of thread from a spool. The unit comprises a channel shaped element with the mid portion paralleling the axis of the spool and the two arms straddling the ends of the spool. The arms have short projections that enter the ends of the cylindrical bore through the spool whereby the spool can rotate within the keeper unit. The space between the mid portion of the keeper and the thread on the spool is filled with compressible friction applying material that expands to be in continuous braking engagement with the thread as it is pulled and unwound from the spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.