Small-sized electronic instrument

Details Small-sized electronic instrument Small-sized electronic instrument

1991-09-24

1993-08-10

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With significant casing or mounting support structure

368318, G04C 2302

Patent

active

052355640

ABSTRACT:
A small-sized electronic instrument such as an electronic wrist watch and others in which a plurality of parts are stacked and firmly held together by tightening a screw. The electronic instrument includes a base plate and a screw housing portion, which are integrally molded of a hard plastic material. The screw housing portion includes a bore formed therethrough and adapted to receive a self-tapping screw. When the self-tapping screw is threadingly received in the bore of the screw housing portion, a plurality of parts stacked around the screw housing portion are firmly tightened and held together. The screw housing portion has a shoulder including a step formed therein at the middle portion between the opposite ends. On assembly, the step engages one of the stacked parts. Even if the screw housing portion is pulled upwardly by the tightened self-tapping screw, the part sandwiched between the self-tapping screw and the step limits the upward movement of the screw housing portion on tapping. Thus, the screw housing portion can be prevented from being broken off from the base plate when the self-tapping screw is further tightened against the base plate.

REFERENCES:
patent: 4243329 (1981-01-01), Nakayama
patent: 4437768 (1984-03-01), Miyasaka
patent: 4788669 (1988-11-01), Kamiyama
patent: 4876677 (1989-10-01), Moriya

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