Gear train for analog display timepiece
AssigneeBulova Watch Company, Inc.
InventorErich Walker
Life of this patent
Estimating the term…
Abstract
An electronic or mechanical timepiece of the analog display type provided with a gear train for driving timekeeping hands. The gear train includes a center pipe affixed to an intermediate bridge secured to the base plate, a free cannon pinion being rotatably supported on the pipe and having a center wheel mounted thereon which is disposed in the space between the bridge and a section of the base plate, thereby providing a dependable support for the cannon pinion without the need for enlarging the diameter of the center wheel or of the drive pinion intermeshing therewith.
Claims6
In an analog display timepiece whose timekeeping hands are driven by a gear train, the train comprising:
- A. a base plate having an intermediate bridge secured thereto spaced from a section of the plate to define a gear space;
- B. a center pipe normal to the base plate and affixed at one end to said bridge, said center pipe having a seconds hand shaft coaxially disposed therein;
- C. a free cannon pinion mounted on said center pipe;
- D. an hour wheel having a tubular extension concentric with said cannon pinion and rotatable thereon;
- and
- E. a center wheel disposed in said gear space and frictionally clamped on said cannon pinion, said cannon pinion being provided with toothing engaged by a minute wheel, the center wheel being provided with stop means extending radially beyond said toothing and cooperating with a counter stop formed on said section of the base plate.
Dependencies are inferred from the claim text.