Chronograph timepiece and lever device for timepiece
AssigneeSeiko Instruments Inc.
InventorsNorio Shibuya, Takashi Takahashi, Mamoru Watanabe
Life of this patent
Estimating the term…
Abstract
In a state in which a chronograph mechanism is not operated, a coupling lever 442 positions a second counting transmission pinion 212b such that the second counting transmission pinion 212b is separated from a second chronograph wheel 214. In a state in which the chronograph mechanism is operated, the coupling lever 442 is moved to rotate such that the chronograph mechanism is operated. As a result, the second counting transmission pinion 212b is in mesh with the second counting wheel 214. By bringing an outer peripheral portion 442f of a guide frame 442d into contact with a contact portion 202d of a chronograph bridge 202, movement of the coupling lever 442 is set.
Claims33
A chronograph time piece comprising:
- a barrel mounted for undergoing rotation;
- a front train wheel for undergoing rotation in accordance with rotation of the barrel;
- a second counter intermediate wheel for undergoing rotation in accordance with rotation of the front train wheel;
- a second counting wheel for undergoing rotation in accordance with rotation of the second counter intermediate wheel in a chronograph measurement mode;
- a chronograph bridge for rotatably supporting an upper shaft portion of the second counting wheel;
- a chronograph second display member for displaying a result of measurement of an elapsed time period in seconds in accordance with rotation of the second counting wheel;
- and
- a coupling lever for rotatably supporting an upper shaft portion of the second counter intermediate wheel and for preventing rotation of the second counter intermediate wheel from being transmitted to the second counting wheel in a mode in which chronograph measurement is not executed and for transmitting rotation of the second counter intermediate wheel to the second counting wheel in the chronograph measurement mode;
- wherein in the mode in which the chronograph measurement is not executed, the coupling lever is not brought into contact with the chronograph bridge, and in the chronograph measurement mode, a portion of the coupling lever is brought into contact with the chronograph bridge.
A chronograph time piece for measuring elapsed time periods in seconds, minutes and hours in a chronograph measurement mode, the chronograph time piece comprising:
- a main plate;
- a barrel mounted on the main plate for undergoing rotation;
- a second counting wheel for measuring an elapsed time period in seconds in accordance with rotation of the barrel in a chronograph measurement mode;
- a minute counting train wheel for measuring an elapsed time period in minutes in accordance with rotation of the barrel in the chronograph measurement mode;
- a pair of hour counting train wheels for measuring an elapsed time period in hours in accordance with rotation of the barrel in the chronograph measurement mode;
- a chronograph second display member for displaying a result of measurement of the elapsed time period in seconds in accordance with rotation of the second counting wheel;
- a chronograph minute display member for displaying a result of measurement of the elapsed time period in minutes in accordance with rotation of the minute counting train wheel;
- a chronograph hour display member for displaying a result of measurement of the elapsed time period in hours in accordance with rotation of the hour counting train wheel;
- an operating lever mounted on the main plate for undergoing sliding movement;
- an operating cam for undergoing rotation in one direction in accordance with sliding movement of the operating lever, the operating cam having a plurality of ratchet teeth engaging the operating lever and having a plurality of drive teeth, the number of ratchet teeth being twice as many as the number of drive teeth;
- and
- a stop lever mounted for undergoing rotation to stop rotation of the second counting wheel by rotating the drive teeth of the operating cam in a mode in which chronograph measurement is not executed.
A lever apparatus for a time piece, the lever apparatus comprising:
- an operating lever mounted for undergoing sliding movement;
- an operating cam for undergoing rotation in one direction in accordance with sliding movement of the operating lever, the operating cam having a plurality of ratchet teeth engaging the operating lever and a plurality of drive teeth, the number of ratchet teeth being twice as many as the number of drive teeth;
- a stop lever for undergoing rotation in accordance with rotation of the drive teeth;
- a coupling lever for undergoing rotation in accordance with rotation of the stop lever;
- an hour coupling operation lever for undergoing rotation in accordance with rotation of the stop lever;
- and
- an hour coupling lever for undergoing rotation in accordance with rotation of the hour coupling operation lever.
Dependencies are inferred from the claim text.