Rule assembly with protective film
US6804899B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Oct 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A retractable rule assembly includes a housing assembly and a reel in the housing assembly. An elongated blade formed of a ribbon of metal having one end connected to the reel is able to extend outwardly through a spaced opening in the housing assembly. A coil spring is arranged within the housing so as to wind up the blade when extending from the housing. A blade holding assembly is actuatable to hold the blade outwardly of the housing assembly opening and to release the blade from any position in which it is held. A relatively short free end portion of the blade has a film of plastic material adhered to a convex or a concave side thereof. The clear film of plastic material protects the covered portion of the blade from cracking or tearing and protects any indicia on the end of the blade from wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.