Slip wheel structure of a watch movement
US3930361A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Oct 15, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B13/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A slip wheel arrangement of a watch movement in which a center wheel is provided with an integral arbor which, in turn is formed with a double-tapered portion. For a slip-on coupling of a cannon pinion with the arbor, the pinion is formed with an integral tubular portion which includes a middle resilient part and a thickened end part, and is provided with at least one inwardly projecting projection on the resilient part. The leading portion of the bore of the tubular portion has a diameter larger than the sum of a largest diameter measured at the forward part of the arbor from the double-tapered part, plus the coupling idle gap measured thereat, with the inward projection being positioned within the area of the leading portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.