Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1978-08-02
1980-08-05
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335236, 335255, H01F 708
Patent
active
042164540
ABSTRACT:
The present invention is a plunger-type electro-magnetic actuator which produces a constant attracting force regardless of the position of the plunger. A tip portion of the plunger is tapered and a magnetic pole piece of the solenoid adapted to electro-magnetically attract the tip portion is provided with a tapered hole having a diameter larger than the outer diameter of the plunger. An additional magnetic pole piece is substantially displaced from the magnetic pole piece along the advancing direction of the plunger so as to increase the operational range of the plunger.
REFERENCES:
patent: 1436639 (1922-11-01), Bindschedler
patent: 2076858 (1937-04-01), Morgenstern
patent: 3241006 (1966-03-01), Boyko
patent: 4114125 (1978-09-01), Komatsu
Kakishima Todomu
Ohtani Yoshio
Broome Harold
Diesel Kiki Co. Ltd.
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