US 11,854,756 B2
Two-part solenoid plunger
Yanqiu Jia, Suzhou (CN); Dan Jin, Suzhou (CN); and Du Cheng, Suzhou (CN)
Assigned to Suzhou Littelfuse OVS Co., Ltd., Suzhou (CN)
Appl. No. 17/628,044
Filed by Suzhou Littelfuse OVS Co., Ltd., Suzhou (CN)
PCT Filed Jul. 16, 2019, PCT No. PCT/CN2019/096142
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/007770, PCT Pub. Date Jan. 21, 2021.
Prior Publication US 2022/0262589 A1, Aug. 18, 2022
Int. Cl. H01H 50/18 (2006.01); H01H 50/44 (2006.01); H01H 71/24 (2006.01)
CPC H01H 50/18 (2013.01) [H01H 50/44 (2013.01); H01H 71/2463 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A solenoid electrical switch, comprising:
a solenoid bobbin forming a solenoid by being wound with coil windings, the solenoid bobbin having a central aperture defined therein, and the coil windings, which when engaged by a power source, generates a magnetic field, the solenoid bobbin having a top portion including vertically extending contacts spaced apart to define a trench;
a magnetic coupling member mounted on the solenoid and disposed in the trench and proximate to the vertically extending contacts of the solenoid bobbin, the magnetic coupling member surrounding at least a portion of the central aperture; and
a plunger at least partially disposed in the central aperture for rotation and axial reciprocation between at least two positions into and out of the central aperture relative to the solenoid and the magnetic coupling member, the plunger comprising:
a first component including a main body and a central slot within the main body; and
a second component at least partially disposed within the central slot, the second component including an engagement surface engaged with an inner surface of the central slot, wherein second component further includes a shoulder region between a first section and a second section, wherein the engagement surface comprises a knurled surface pattern immediately below the shoulder region, wherein the first component is made from a carbon steel, wherein the second component is made from stainless steel, and wherein the stainless steel is in contact with a conductive plate having at least one contact.