Rule assembly with improved blade hook
US6449866B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1999 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Aug 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/1003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rule assembly includes a housing assembly and a reel rotatably mounted in the housing assembly. An elongated blade formed of a ribbon of metal having one end connected to the reel is constructed and arranged with respect to the housing assembly to extend from a position tangential to the reel outwardly through a spaced opening in the housing assembly in a normal concavo-convex cross-sectional configuration and to wind onto the reel in an abutting volute coil formation in a flattened cross-sectional configuration. The blade has an end hook member on the free end thereof. The end hook member is formed of sheet metal of a predetermined thickness to include a concavo-convex mounting portion having a U-shaped hook portion bent at a generally right angle from an end thereof. The end hook member is mounted on the free end of the blade with the mounting portion thereof secured in limited sliding engagement with a concave side of the free end of the blade so that the rule can be measured externally from an exterior surface of the U-shaped hook portion or internally from an interior surface of the U-shaped hook portion. The U-shaped hook portion includes a bight section extending transvers…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.