US 7,357,569 B2Granted

Crown lock structure and timepiece having crown lock structure

AssigneeSeiko Instruments Inc.

InventorHisamitsu Yoshikawa

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Abstract

A crown lock structure for a timepiece has a crown having an inner surface provided with a threaded section and a connecting assembly for removably connecting the crown to a case of the timepiece. The connecting assembly comprises a tubular member for integral connection to the timepiece case and a tubular insert removably connected to the tubular member. The tubular member has a first tubular portion for insertion into a through-hole of the timepiece case and a second tubular portion integral with the first tubular portion and removably connected to the tubular insert so as to prevent relative rotation between the tubular member and the tubular insert. The tubular insert has a threaded section for threaded engagement with the threaded section of the crown to removably connect the crown to the timepiece case.

Claims12

Dependent claims

A portable watch comprising:

a case having a pipe-attachment hole extending therethrough;
a winding stem pipe comprised of a winding stem pipe body and an exterior pipe, the winding stem pipe body having an inner section inserted into the pipe-attachment hole and fixed to the case in a watertight manner and an outer section that extends out from the exterior of the case, the exterior pipe being removably slidably inserted over the outer section of the winding stem pipe body and having on its outer periphery a male screw section;
means on the outer section of the winding stem pipe body cooperating with complementary means on the exterior pipe for preventing relative rotation between the winding stem pipe body and the exterior pipe;
and a crown having a crown tube slidably extending into and rotatable in the winding stem pipe body and a female screw section removably screwed onto the male screw section to screw lock the crown against unintended rotation.

1 more element

Dependencies are inferred from the claim text.