TODAY’S PATENT – MAGNETIC COMPASS
The MAGNETIC COMPASS was invented by Kenneth LeBlanc (Gloucester, MA) on the 5th of June 1990, bearing patent number US4930224A.
The following invention here consists of a compass bowl, a card assembly pivotally supported on a pivot shaft within the bowl, the card assembly consisting of a compass card and a magnet, and at least one active indicator pin adapted for alignment with the lubber line of a supporting vehicle and with an adjacent degree indicating line upon the compass card.
The following invention is accomplished by attaching the lubber line pins to the frame supporting the card. In this manner, the card and lubber line pins are made to move in unison under conditions of compass roll, but the assembly requires an additional labor step of balancing the frame after the pins are attached.The compass for use in such vehicles typically includes a compass card mounted in a frame that suspends the card to remain level when its support, i.e., the vehicle, is tipped. Ideally, for accurate compass readings, the motion of the lubber line indicator pins follows the motion of the card so the lubber line pins remain parallel to the card degree lines as much as possible.