Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1990-05-15
1992-06-30
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
277212FB, 74 182, A01F 700
Patent
active
051267128
ABSTRACT:
A solenoid apparatus comprising a solenoid case (27) having an open end and a substantially closed end, a plunger (30) electromagnetically movably mounted in the solenoid case, and a substantially cup-shaped flexible water-tight boot (40). The cup-shaped boot (40) surrounds an end portion of the plunger (30) projecting from the solenoid case (27) and connected to the open end of the solenoid case, the flexible boot (40) having a bottom wall central portion intimately secured to the end portion of the plunger (30). The flexible boot (40) comprises a vent hole (44) defined by a hollow tube (45) extending through the boot wall in parallel to the plunger and a flexible valve plate (48) formed integral with and inside of the boot wall and biased by the elasticity of the material of the boot (40) into an open position (FIG. 5). The valve plate (48) is adapted to be pushed against the vent hole tube (45) by the plunger (30) to close the vent hole (44) when the plunger (30) is not operated, and the valve plate (48) is separated by its elasticity from the hollow tube (45) by the elasticity to allow air communication through the vent hole (44) when the plunger (30) is operated.
REFERENCES:
patent: 4720639 (1988-01-01), Sakayanagi et al.
patent: 4916423 (1990-04-01), Sugiyama
Harris George
Mitsubishi Denki & Kabushiki Kaisha
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