Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1978-11-09
1981-02-17
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33346, G01C 1708
Patent
active
042506271
ABSTRACT:
Compass apparatus includes a housing defining a liquid-filled sealed interior space and a compass card member disposed within the liquid-filled space for rotation therein. The housing comprises an upper transparent cover portion having an outwardly directed first flange extending around the perimeter thereof and a lower housing portion, preferably formed of elastic material, having an annular elastic flange extending around the periphery thereof, the upper surface of the latter flange abutting against the lower surface of the first flange in liquid sealing engagement therewith. A connecting ring having a U-shaped cross section maintains the abutting flanges in sealing engagement with each other thereby providing a housing which is simple to close and which may be reopened and reclosed as desired in a manner such that the integrity of the liquid seal is not impaired. A sealing ring member may be provided between the elastic flange of the lower housing portion and the lower flange of the connecting ring. Further, an inner wall portion having an outwardly directed flange may be provided such that the latter flange sealingly engages the flange of the cover portion to define a variable capacity liquid space.
REFERENCES:
patent: 3043465 (1962-07-01), Horner
patent: 3473234 (1969-10-01), Kjellstrom et al.
patent: 3628690 (1971-12-01), Sherman
patent: 3949483 (1976-04-01), White
Jarvenpaa Kauko
Leinonen Pertti
Raisanen Jouko
Martin, Jr. William D.
Suunto Oy
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