Electromagnetic relay

Details Electromagnetic relay Electromagnetic relay

1988-09-28

1989-11-07

Broome, H.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

335203, H01H 5108

Patent

active

048795364

ABSTRACT:
An electromagnetic relay includes a cylindrical bobbin around which a coil is wound, and a step is formed at a middle portion of the cylindrical bobbin. A large-diameter portion is formed at one side of the step, and a smaller-diameter portion is formed at the other side of the step. The outer and inner diameters of the smaller-diameter portion are smaller than those of the large-diameter portion. An armature and a leg of a yoke are inserted in the large-diameter portion, and the armature is inserted in the smaller-diameter portion. The inner diameter of the large-diameter portion corresponds to a total sum of a thickness of the armature, a thickness of the yoke, and a moving stroke of the armature, and that of the smaller-diameter portion corresponds to a total sum of the thickness and the moving stroke of the armature. The coil is wound around the outer surface of the bobbin. A larger number of turns of the coil can be wound around the bobbin than that wound around a bobbin having the same diameter throughout the axial direction by an amount corresponding to a portion (34) of the smaller-diameter portion.

REFERENCES:
patent: 4159455 (1979-06-01), Bosch et al.
patent: 4359703 (1982-11-01), Schedele
patent: 4472699 (1984-09-01), Fujii et al.

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