Safe utility knife
US4713885A · kind A · utility
90Cited by
1References
4Claims
0Family size
Inventors
Key dates
| Filing date | Dec 8, 1986 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Dec 8, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB26B5/003
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A utility knife utilizing a standard commercial blade as a handle forming a guide for a blade slide and also serving as a housing for the blade in a retracted safe position. The blade slide is advanced and retracted by a toggle linkage connected with an operating lever pivotally attached to the handle and biased by a spring to a position causing automatic retraction of the blade into the housing when the lever is released. When the lever is grasped and pulled toward the handle for advancing the blade to a use position, the toggle linkage assumes a straight line dead center slide and blade locking position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.