| 摘要 |
A timepiece comprises a case and a back cover with improved snap-fitting means for releasably fastening the cover to the case. The back cover includes as improved snap-fitting means a peripheral engagement surface of noncircular, multilobal cross-section having a lobal diameter selected in relation to the diameter of a circular engagement surface on the case such that said surfaces are in snap-fit relation only at multiple, spaced locations, rather than along their entire peripheries, whereby the engagement surface of the back cover can flex elastically between the spaced contact locations and thus facilitate removal and attachment of the back cover by snap-fitting.
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