Electrophoretic fluid damper

Details Electrophoretic fluid damper Electrophoretic fluid damper

1990-01-10

1991-05-28

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Magnetic fluid or material

188300, F16F 953, F16F 1503

Patent

active

050186060

ABSTRACT:
An electrophoretic fluid damper in which cooperable electrodes are slidably disposed one within the other and are connected respectively to relatively movable members. An electrophoretic fluid capable of separating into particle-rich and particle-deficient phases by electrophoresis operates in surface contact with the electrodes. An electrically nonconductive material having raised surface areas and spaces between the surface areas is associated with one of the electrodes. When a voltage is applied between the electrodes in a first direction, the particle-rich phase of the fluid collects on one of the electrodes and also makes contact with the spaces and the raised surface areas of the material associated with the other electrode thereby engaging or locking the electrodes together and transmitting force between the members. When the voltage potential is applied in the opposite direction, the particle-rich phase migrates to the other electrode and collects in the spaces between the raised surfaces of the material, thereby disengaging the electrodes and reducing the transmission of force between the elements. The apparatus may be configured as a shock absorber or linear brake.

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patent: 3207269 (1965-09-01), Klass
patent: 3255853 (1966-06-01), Klass et al.
patent: 4782927 (1988-11-01), Sproston et al.
patent: 4790522 (1988-12-01), Drutchas
patent: 4819772 (1989-04-01), Rubel
patent: 4896754 (1990-01-01), Carlson et al.
Carlson, et al., U.S. patent application Ser. No. 07/246,847, filed Sep. 20, 1988.
Carlson, U.S. patent application Ser. No. 07/463,276, filed Jan. 10, 1990.
Carlson, U.S. patent application Ser. No. 07/463,245, filed Jan. 10, 1990.

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