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US 4,081,912 AGranted
Magnetic bearing plotting and sighting device
OwnerDavid F. Laneyinventor
Life of this patent
Estimating the term…
Abstract
A device for taking and plotting magnetic bearings which includes an elongated straight edge device having numerical graduated indicia along one edge thereof, and a housing receiving said straight edge. A magnetic compass is mounted on the straight edge, and the housing includes folding portions adapted to enclose and protect the magnetic compass. A pair of sight pins are removably attachable to the compass and straight edge to provide a line of sight extending through the pivot point of the magnetized needle of the compass.
Claims11
A device for taking and plotting magnetic bearings comprising:
- a flat, elongated straight edge element of right parallelepiped configuration having an elongated straight edge along one side thereof, and graduated indicia along said straight edge, said straight edge having an aperture therein for frictionally and removably receiving a sight pin extending vertically upwardly from the major plane of the straight edge element;
- a housing including a pair of spaced, opposed hollow portions each closed at one end by an end wall and interconnected by a bottom wall supporting said straight edge element, said end walls each having slots therein with said straight edge element extending through said slots;
- a magnetic compass subassembly mounted on said straight edge between said hollow portions of said housing and including:
- a transparent plate having indicia thereon facilitating alignment of two spaced points on said plate with said aperture in said straight edge element;
- a sight pin removably retained at one of said points and projecting from said transparent plate and normal to the major plane of said straight edge element;
- and
- a magnetic compass secured to said transparent plate and including a pivotally mounted compass needle supported for pivotation about an axis extending through the second point on said plate and normal to the major plane of said straight edge.
4 more elements
A magnetic direction indicating device comprising:
- a housing including:
- opposed spaced hollow end portions of rectangular parallelepiped configuration and including a common bottom wall in said end portions and extending between and interconnecting said end portions;
- flap means foldably connected to said bottom wall between said end portions and foldable to a closure position for cooperation with said end portions to form a substantially closed housing;
- a magnetic compass assembly supported over said bottom wall between said end portions and positioned to be exposed for usage in one position of said flap means, and to be enclosed in said housing when said flap means is folded to said closure position.
1 more element
Dependencies are inferred from the claim text.