Title: Slip wheel structure of a watch movement

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.

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Inventors: Saito, Mituo (Tokyo, JA)
Ishikawa, Goro (Higashiyamato, JA)
Tutiya, Hidetaka (Akishima, JA)

Application Number: 515068
Filing Date: 1974-10-15
Publication_date: 1976-01-06
Assignee: Citizen Watch Co., Ltd. (Tokyo, JA)
Primary Class(es): 368/323 368/322, 968/81, 968/93, 968/DIG1
Other Classes:
US Patent Ref:
Other Refs: 723,364

Apr, 1932	FR

Primary Examiner: Miller, Jr., George H.
Assistant Examiner:
Attorney: Holman & Stern