Geometrical instruments – Indicator of direction of force traversing natural media – With viewing aid
Patent
1999-01-25
2000-11-14
Hirshfeld, Andrew H.
Geometrical instruments
Indicator of direction of force traversing natural media
With viewing aid
33355R, 362190, 362196, 362253, F21L 400, F21V 3300, G01C 1720
Patent
active
061452092
ABSTRACT:
An illuminating device includes a mounting plate adapted to be mounted on a bottom of a magnetic compass in a first direction. The mounting plate has a central axial hole passing therethrough in a second direction transverse to the first direction and defining a central axis, and a battery receiving chamber for receiving a battery. A lighting member is disposed on the mounting plate, and has a first lead electrically connected to a first pole of the battery. First and second conductive members are connected respectively to a second lead of the lighting member and a second pole of the battery, extend above the central axial hole, and are spaced apart from each other along the central axis. A cover plate is disposed on the mounting plate for closing the chamber, and is rotatable relative to the mounting plate about the central axis between locked and unlocked positions. An elastomeric activating member is disposed in a central through hole of the cover plate, and has an actuating portion to be depressed manually and a depression portion extending from the actuating portion upwardly through the axial hole to activate electric contact between the first and second conductive members so as to energize the lighting member with the battery when the actuating portion is depressed.
REFERENCES:
patent: D411121 (1999-06-01), Chang
patent: 2803068 (1957-08-01), Mason
patent: 3256428 (1966-06-01), Schwartz
patent: 4899453 (1990-02-01), Bhat et al.
patent: 5469345 (1995-11-01), Pettersen et al.
Hirshfeld Andrew H.
Smith R. Alexander
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