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US 4,404,752 AGranted
Clip-on compass
OwnerJohn W. Hannainventor
Life of this patent
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Abstract
The invention is in the field of compass course following and comprises a means and method of mounting a compass directly on a map with a North-South reference line and following a course on the map directly once the compass needle is aligned with North. In all references to the direction "North" throughout this document magnetic North only shall apply.
Claims1
A clip-on compass assembly comprising:
- (a) a non-ferromagnetic frame;
- (b) a "North" indicator on said frame;
- (c) a compass needle pivotally mounted to said frame and allignable with said indicator;
- (d) a clamp mounted on said frame for clamping a map beneath said compass needle;
- (e) said frame including a mounting plate with said needle mounted atop same and said frame also having a reference line-defining structure alignable with a reference line on a map engaged by said clamp;
- (f) Said clamp comprising a cam-type over-the-center device with a roller which clamps against the bottom of said plate;
- and,
- (g) said plate having an extended resilient end with a spaced return portion defining a deep bay to receive a map, with said clamp being pivoted to said end.
5 more elements
Dependencies are inferred from the claim text.