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US 5,469,631 AGranted
Air bubble free compass and method of manufacturing same
AssigneeRule Industries, Inc.
InventorsJames T. Burrill, William N. Anastos
Life of this patent
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Abstract
A method of preventing air bubbles in a compass equipped with fluid expansion capability, wherein a compass unit is assembled with a fluid expansion diaphragm; the compass unit is filled with fluid expanding the diaphragm, and sealed while maintaining the diaphragm in its expanded state for preventing air bubbles in reduced pressure and/or reduced temperature conditions, without significantly changing the basic structure of the compass.
Claims5
A method of preventing air bubbles in a compass equipped with fluid expansion capability, the method comprising:
- assembling a compass unit with fluid expansion means;
- over filling said compass unit with fluid while expanding said fluid expansion means;
- and
- sealing said compass unit while maintaining said fluid expansion means in its expanded state thereby exerting pressure on the fluid for preventing air bubbles in reduced pressure and/or reduced temperature conditions.
1 more element
An improved compass comprising:
- a compass housing;
- a compass unit filled with damping fluid mounted with said compass housing;
- and
- fluid expansion means for sealing said fluid in said compass unit, said fluid expansion means is over expanded when the compass is manufactured and sealed in said condition thereby exerting pressure on said fluid for preventing air bubbles at reduced pressure and/or reduced temperature conditions.
1 more element
Dependencies are inferred from the claim text.