Proportional magnetic actuator device

Claim 1

A LIGHT WEIGHT ACTUATOR ADAPTED FOR USE IN CONTROLLING MODEL VEHICLES COMPRISING: (A) AN ELECTROMAGNET HAVING A CORE, (B) A WINDING ON SAID CORE, (C) MAGNETIZABLE MEANS CONNECTED TO THE ENDS OF SAID CORE, AND SELECTIVELY ENERGIZED THEREBY, (D) SAID MAGNETIZABLE MEANS DISPOSED IN A COMMON PLANE TO COMPLETE A MAGNETIC CIRCUIT, (E) A MAGNETIZED MEMBER MOUNTED IN A PLANE PARALLEL TO SAID COMMON PLANE, (F) A ROCK SHAFT JOINED TO THE SURFACE OF SAID MAGNETIZED MEMBER FOR MOVEMENT THEREIWTH. (G) SAID MAGNETIZABLE MEANS HAVING ZONES OF REDUCED CROSS-SECTIONAL AREA FORMED THEREIN, (H) SAID ZONES PERMITTING MAXIMUM LEADKAGE FLUX TO ESCAPE THEREFROM AND TO ATTRACT SAID MAGNETIZED MEMBER INTO ALIGNMENT THEREWITH WHEN SAID MAGNETIZABLE MEANS ARE ENERGIZED, AND SAID ROCK SHAFT BEING INDEXED IN ACCORDANCE WITH THE MOVEMENT OF SAID MAGNITIZED MEMBER, (I) SAID MAGNETIZABLE MEANS COMPRISING A PAIR OF MAGNETIZABLE POLAR ARMS EXTENDING AXIALLY FROM THE ENDS OF THE CORE, SAID POLAR ARMS HAVING INTURNED POLE PIECES AT THE ENDS OF THEREOF, SAID POLE PIECES EACH BEING A FLAT STRIP OF MATERIAL OF SUBSTANTIALLY UNIFORM WIDTH AND SEMI-CIRCULAR IN SHAPE AND MOUNTED UPON THE PERIPHERY OF A PLASTIC DISC, SAID POLE PIECES BEING SEPARATED BY AIR GAPS.