Safe door bolt
US4245567A · kind A · utility
5Cited by
3References
2Claims
0Family size
Inventor
Key dates
| Filing date | Aug 23, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Aug 23, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safe door bolt is rendered substantially punch-proof by providing as a part of the bolt a hardened plug. This plug has a tapered portion positioned to cause radial expansion of material forming part of the bolt in response to an end blow delivered to the bolt attempting to retract the same into the door. Thus, any force in the form of a sudden axial blow to the end of the door bolt by a burglar will result in the radial expansion of material of the bolt to block its retraction into the guide bore of the safe door thereby frustrating burglary attempts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.