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US 6,422,348 B1Granted
Transmission wheel, method for manufacturing transmission wheel and self-winding wheel train structure having transmission wheel
AssigneeSeiko Instruments Inc.
InventorsKoichiro Jujo, Mitsuru Ishii
Life of this patent
Estimating the term…
Abstract
A transmission wheel comprises a gear having a hole and a pinion having a plurality of teeth and being removably mounted in the hole of the gear. The hole of the gear has at least one chord-shaped stop portion engaging two adjacent teeth of the pinion to prevent relative rotation between the pinion and the gear.
Claims20
A transmission wheel comprising:
- a pinion having a plurality of teeth;
- and a gear having a hole in which the pinion is mounted, the hole having at least one chord-shaped stop portion disposed between two adjacent teeth of the pinion, the chord-shaped stop portion having opposite ends each abutting against a portion of a respective one of the two adjacent teeth of the pinion to prevent relative rotation between the pinion and the gear.
A transmission wheel comprising:
- a gear having a hole at a central portion thereof, the hole having at least one chord-shaped stop portion;
- and a pinion having a plurality of teeth and being removably mounted in the hole of the gear with the chord-shaped stop portion of the hole engaging two adjacent teeth to prevent relative rotation between the pinion and the gear.
A self-winding wheel train comprising:
- an oscillation weight for undergoing oscillating movement;
- a first reduction wheel for undergoing rotation in accordance with oscillating movement of the oscillation weight;
- a pawl lever connected to the first reduction wheel for undergoing pivotal movement in accordance with rotation of the first reduction wheel;
- a second reduction wheel having a gear and a pinion and being disposed in contact with the pawl lever for undergoing rotation in only one rotational direction, the gear having a hole having at least one chord-shaped stop portion, and the pinion having a plurality of teeth and being mounted in the hole of the gear with the chord-shaped stop portion of the hole engaging two adjacent teeth to prevent relative rotation between the pinion and the gear;
- and a ratchet wheel disposed in meshing engagement with the pinion of the second reduction wheel for rotation therewith.
2 more elements
A method for manufacturing a transmission wheel, comprising the steps of:
- forming at a central portion of a gear a hole having at least one chord-shaped portion;
- providing a pinion having a plurality of teeth;
- and fitting the pinion in the hole of the gear so that the chord-shaped portion of the hole is disposed in contact with a pair of adjacent teeth of the pinion to prevent relative rotation between the pinion and the gear.
Dependencies are inferred from the claim text.