Magnetic snap latch

Details Magnetic snap latch Magnetic snap latch

1982-09-29

1984-03-13

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Latching means

335179, 335183, H01H 920

Patent

active

044370792

ABSTRACT:
A magnetic snap latch having a coil (4) wound on a preformed insulating bobbin (3) having anti-rotation projections (3a) that locate and fix the coil within a high permeability magnetic shell (2). A high permeability magnetic plunger (1) extends through a hole (2a) in the shell into the coil (4) and has rigidly secured thereto a low permeability magnetic disk (6) within the shell. A high permeability backplate (5) closes the open end of the shell and defines an air gap (AG2) in which is located a non-magnetic return spring (7). When the coil is energized, the disk (6) is initially attracted to the shell (2) to move the plunger (1) a small distance to the right but the disk (6) then saturates and the increasing magnetic force in the air gap (AG2) snaps the plunger (1) to the left, whereafter the return spring (7) restores the plunger (1) when the coil (4) is deenergized.

REFERENCES:
patent: 1525697 (1925-02-01), Stoekle
patent: 3274525 (1966-09-01), Valleau
patent: 3683239 (1972-08-01), Sturman
patent: 3740682 (1973-06-01), Schantz
patent: 4000481 (1976-12-01), Pang

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