Magnetic compass

Details Magnetic compass Magnetic compass

2005-12-13

2005-12-13

Smith, R. Alexander (Department: 2859)

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

C033S348000

Reexamination Certificate

active

06973732

ABSTRACT:
A magnetic compass includes a base having a receiving chamber for receiving a compass body, a battery chamber for receiving a battery set, an illuminant chamber for receiving an illuminant, and a locating chamber for receiving an electrically conductive member. The illuminant has a first terminal suspended above the battery set. A push button is supported on the first terminal of the illuminant for pressing by the user to force the first terminal of the illuminant downwards into contact with a first terminal of the battery set. The conductive member has a base frame mounted in the locating chamber, and a contact portion extended from the base frame and inserted into the battery chamber and pressed on a second terminal of the battery set. A second terminal of the illuminant is electrically connected to the base frame of the conductive member.

REFERENCES:
patent: 3181974 (1965-05-01), La Barben
patent: 4438568 (1984-03-01), Kramer et al.
patent: 5922489 (1999-07-01), Adachi
patent: 6145209 (2000-11-01), Chang
patent: D462020 (2002-08-01), Chang
patent: 6527584 (2003-03-01), Ninomiya
patent: 6578277 (2003-06-01), Chang
patent: 6603670 (2003-08-01), Chien
patent: 2005/0068764 (2005-03-01), Chen

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