Tubular solenoid

Details Tubular solenoid Tubular solenoid

H - Electricity

01

F

310/60

H01F 7/08 (2006.01) F02M 51/06 (2006.01) F02M 61/16 (2006.01) H01F 5/04 (2006.01) H01F 7/16 (2006.01)

Patent

CA 1113993

TUBULAR SOLENOID Abstract of the Disclosure Low cost tubular solenoids are formed with a drawn case in which the pole portion forming the base of the solenoid is defined as an integral inwardly extending part of the case. A coil bobbin is formed by the injec- tion molding of plastic material and is provided with an integral wall which is positioned in abutting relation to the inside surface of the pole portion, thereby forming a stop surface for the solenoid plunger and effectively spacing the plunger from the base. The plunger is guided on the internal surfaces of the bobbin and in one embodiment, a spun hollow sheet metal bushing is captured by the case in telescopic relation to the bobbin, and is formed with threads which receive thereon a sheet metal retaining nut. In another embodiment of the invention, a washer is threaded onto an axial extension portion of the bobbin, and the open end of the case is crimped onto an annular groove formed on the washer. In a further embodiment, the washer is injected molded in place on the bobbin. Terminal leads are molded on the bobbin and extend through apertures formed in a bobbin extension elimating the need for the placement of coil lead-in wires.

335508

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