Patent ID: 6744347
Filing Date: 2004-06-01
Classification: H01C

Abstract:
A variable resistor comprising:a case which is open at a top surface and a bottom surface thereof; a substrate fitted into the lower opening of the case, the substrate including a collector electrode on the top surface thereof and an arcuate resistor disposed around said collector electrode; a rotor rotatably fitted into the top opening of the case, said rotor having a tool engagement groove at an upper surface thereof, an annular groove disposed around the tool engagement groove at the upper surface thereof, and a first stopper portion provided inside of the annular groove; a slider mounted on the bottom surface of the rotor, said slider including a first contact arm arranged to contact with said collector electrode and a second contact arm arranged to contact with said arcuate resistor, the first and second contact arms being integral with said slider; a metallic cover including a top plate portion supporting the top surface of the rotor, a hole provided at said top plate portion such that said tool engagement groove of the rotor is exposed, a pair of leg portions extending downward along two sides of the case, and a second stopper portion arranged to protrude in the inner edge of the hole of the metallic cover, said second stopper portion being bent downward so as to be inserted into the annular groove of the rotor to control the rotational angle of the rotor by abutting against the first stopper portion; wherein said metallic cover supports the bottom surface of the substrate such that the metallic cover is placed on the case from the upper portion of the case and the leg portions thereof are folded inwardly along the bottom surface of the case.