Magnetic latch mechanism and method particularly for brakes

Details Magnetic latch mechanism and method particularly for brakes Magnetic latch mechanism and method particularly for brakes

1994-05-25

1995-08-22

Butler, Douglas C.

Brakes

Operators

Automatic

188156, 188161, 188164, 335219, B60T 712

Patent

active

054431328

ABSTRACT:
A magnetic latching mechanism and method having permanent magnets and electromagnets arranged to alternately magnetically latch one member to either of two other members using the magnetic flux of the permanent magnets. The magnetic flux of the electromagnets is used to modify the permanent magnetic flux to cancel its magnetic latching to one of the other members and attract the one member to the other of the other members so that the one member is moved to disengage from the one member and engage that other member. The electromagnets are then deenergized and only the permanent magnets' magnetic flux magnetically latches the one member to that other member. The process is reversed to move the one member back into latching engagement with the member with which it in disengaged, magnetically released, relation. The mechanism is disclosed as being used to actuate and release parking brakes by acting on a parking brake actuating arm to move, latch and release that arm. Mechanical assist mechanisms are also disclosed which may be used to assist in the magnetic force instigated movements as needed.

REFERENCES:
patent: 2304118 (1942-12-01), Phair
patent: 2924116 (1960-02-01), Abbott
patent: 3134463 (1964-05-01), Birge
patent: 3244259 (1966-04-01), Brede, III et al.
patent: 3668445 (1972-06-01), Grove
patent: 3760909 (1973-09-01), Grove
patent: 4004262 (1977-01-01), Grove
patent: 4004663 (1977-01-01), Stibbe
patent: 4172242 (1979-10-01), Myers et al.
patent: 5000297 (1991-03-01), Shaw et al.

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