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US 4,048,795 AGranted
Timepiece calendar mechanism
AssigneeBulova Watch Company, Inc.
InventorRene Risi
Life of this patent
Estimating the term…
Abstract
A timepiece calendar mechanism which includes a monthly date ring having a circular set of internal teeth and a day-of-the-week disc disposed within the interior space of the date ring and concentric therewith, the day disc having a circular set of external gear teeth. Pivotally mounted between the two sets of gear teeth is a twin jumper having oppositely-directed arms whose free ends are provided with detents which respectively engage the sets of teeth.
Claims4
In a calendar mechanism for a timepiece, the combination comprising:
- A. a date ring having a circular set of internal gear teeth;
- B. a day disc disposed within the interior space of the date ring and concentric therewith, said day disc having a circular set of external gear teeth;
- and
- C. a double-acting twin jumper pivotally mounted between the two sets of teeth, the pivot of said jumper allowing for a limited degree of shifting movement, said jumper being formed by two oppositely-directed lever arms extending from either side of said pivot, each arm having a detent at the free end thereof engaging a respective set of teeth and being angled in the same direction as the section of teeth in the set adjacent thereto, each arm having integral therewith a biasing spring whose free end rests against a fixed element to maintain the position of said jumper between said two sets of teeth.
1 more element
Dependencies are inferred from the claim text.