Break-away door knob
US4195502A · kind A · utility
23Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1978 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Jun 2, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7949
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door knob on a knob sleeve or spindle which is adapted to be blocked from rotation is connected to such spindle by a break-away ring and is otherwise rotatable on the spindle. The break-away ring is mounted about the spindle between the end of the fixed hub of the lock chassis and an internal flange on the knob, and has a pair of radial lugs extending inward to key it to the spindle and a pair of axial lugs extending into the knob flange to key it to the knob. One pair, preferably the axial pair of lugs, is adapted to break away under excessive knob turning force to disconnect the rotative connection of the knob to the spindle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.