Tape rule assembly with differential spring-drive systems
US10870555B2 · kind B2 · utility
1Cited by
19References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 2017 |
| Grant date | Dec 22, 2020 |
| Priority date | — |
| Expiry date | Nov 26, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2003/1053
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tape rule assembly includes differential spring-drive systems for rotating a reel of tape through an angular distance different from the angular distance traveled by a hub carrying a wound spring, relative to the tape rule housing. The differential spring drive systems include planetary and cycloidal drive systems. The tape rules of the present invention are thus made more compact than conventional tape rules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.