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Browse Prior Art Database

Latch Relay

IP.com Disclosure Number: IPCOM000090382D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Beausoleil, WF: AUTHOR [+2]

Abstract

Elongated receptacle or tube 10 is provided which has a narrow or necked-down section 12 in its middle dividing the tube into two end sections. Tube 10 contains pellet 14 of an electroconductive liquid having a colloidal suspension of magnetic particles in it. The liquid has a high surface tension and is nonwetting with respect to the material of tube 2. Thus, pellet 14 remains in a single mass allowing only two stable positions, one on either side of section 12. Coil 16 surrounds tube 10 such that the electric field produced when coil 16 is energized by a current in the right direction causes the pellet 14 to pass through section 12 of tube 10 to the other stable state.

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Latch Relay

Elongated receptacle or tube 10 is provided which has a narrow or necked-down section 12 in its middle dividing the tube into two end sections. Tube 10 contains pellet 14 of an electroconductive liquid having a colloidal suspension of magnetic particles in it.

The liquid has a high surface tension and is nonwetting with respect to the material of tube 2. Thus, pellet 14 remains in a single mass allowing only two stable positions, one on either side of section 12.

Coil 16 surrounds tube 10 such that the electric field produced when coil 16 is energized by a current in the right direction causes the pellet 14 to pass through section 12 of tube 10 to the other stable state. When the coil 16 energization is removed, pellet 14 remains in the end of tube 10 until it is again subjected to an electric field in the reverse direction causing it to pass back through portion 12.

Terminals 18 are located at each end of tube 10 such that electrical connections can be made through pellet 14 when it is located in that end of the receptacle. Filter material 20 is located in each end of tube 10 along with air return tube 22 which extends from one end of tube 10 to the other. Tube 22 provides an air return path so that air pressure is not built up in either end of tube 10 preventing the movement of pellet 14 into the desired end. Filter material 20 keeps the liquid from blocking the end of tube 22.

Pellet 14 can be located in either end of tube 10 depending on which way...