Watch and crown used in this watch

• US 20060187766A1
• Filed: 02/14/2006
• Published: 08/24/2006
• Est. Priority Date: 02/21/2005
• Status: Active Grant

• Current Assignee: Seiko Instruments Incorporated (Seiko Group)
• Original Assignee: Seiko Instruments Incorporated (Seiko Group)
• Inventors: Hiranuma, Haruki, Omori, Nobukazu
• Granted Patent: US 7,591,582 B2
• Time in Patent Office: Days
• US Class Current: 368/319
• CPC Class Codes: G04B 3/043 Locking of the operating element, also by mounting in a concealed place
• CPC Class Codes: G04B 37/103 by screwing the crown onto the case

Abstract

A watch is offered in which the life of the threadedly engaged portion between the stem pipe and the crown can be improved and which has an internal thread capable of being machined relative to the crown easily and accurately. The watch is based on a watch in which the crown is threadedly locked to a stem pipe mounted to a barrel. The stem pipe has a barrel outside protruding portion provided with an external thread. The crown has a crown shaft and a crown ring having an internal thread removably threaded to the external thread, the ring being connected to the crown shaft. The crown shaft has a barrel insertion cylindrical portion which is smaller in diameter than the crown ring and inserted in the stem pipe and a ring connection portion mounted integrally with this cylindrical portion and connected to one end portion of the crown ring.

Claims

1. A watch comprising:

a barrel;

a stem pipe disposed outside this barrel and having a barrel outside protruding portion provided with an external thread; and

a crown having a crown shaft and a crown ring connected to said crown shaft, the crown ring having an internal thread removably threaded to said external thread, said crown shaft having a barrel insertion cylindrical portion inserted in said stem pipe and a ring connection portion mounted integrally with the cylindrical portion, the ring connection portion being connected to one end portion of said crown ring, the barrel insertion cylindrical portion being smaller in diameter than said crown ring.

2. A watch according to claim 1, wherein said crown shaft and said crown ring are made of dissimilar materials.

3. A watch according to claim 1, wherein said crown ring and said crown shaft are made different in color.

4. A watch according to claim 1, wherein said crown ring is provided with a coupling hole that is larger in diameter than said internal thread, and wherein said ring connection portion has a connecting external threaded portion threaded into a part of said external thread and a press-fitted portion press fitted in said coupling hole by threaded engagement between the connecting external threaded portion and said internal thread.

5. A crown for a watch, comprising:

a crown shaft; and

a crown ring having an internal thread in its inner surface;

said crown shaft having a barrel insertion cylindrical portion of a diameter smaller than that of said crown ring and a ring connection portion mounted integrally with this cylindrical portion and connected to one end portion of said crown ring.