Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Reexamination Certificate
1998-04-09
2001-06-19
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
C361S160000
Reexamination Certificate
active
06249420
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of arranging several relay functions and also to a multiple relay arrangement configured in accordance with the method. So-called multiple relays are used in many fields. One common field of use is related to telecommunications equipment, in which such relays are used in large numbers for connecting and disconnecting pairs of telephone lines, for instance.
DESCRIPTION OF THE BACKGROUND ART
Electromechanical components are still used in the field of telecommunications, and also in other fields, often in the form of relays, selector switches and like components. Relays can often have multiple functions, for instance test access functions for line interfaces in a digital telephone station. These access functions may be of a multiple type where a plurality of relays having mutually the same function are mounted on a circuit board. A large number of electromagnets are often used in the provision of these multiple functions, each of the electromagnets acting on a spring unit or the like. In constructions in which several relays are collected on a unit, only the force from the electromagnet or the electromagnets where an effect is desired is used, said magnets often being only used one at a time. The functions often involve driving only a few function initiating devices from many such devices and the large number of electromagnets included is unnecessarily large, since each electromagnet is sufficiently strong in itself to carry out a function. Since electromagnets with magnets and coils require space and each incurs an individual cost, it is important that the electromagnets have the smallest possible size and are inexpensive. Patent Publications SE 129 171, 343 718, 359 194 and CH 46807 disclose multiple relays for telecommunications applications that include permanent magnets which are each solely effective in making or breaking an electric contact.
DISCLOSURE OF THE INVENTION
With the intention of lowering the cost of providing a so-called multiple relay, there is provided in accordance with the invention a multiple relay arrangement that includes a common fixed part that carries several permanent magnets, a common movable part that carries several permanent magnets, and several fixed coils which are disposed between the common fixed part and the common movable part and which have magnetic-force actuable and displaceable cores connected with electrical connection elements. When each of the coils carries current, the cores that are actuable by magnetic forces will either move to a new position or be held in their present position at that point in time, depending on the direction in which current flows through the coil and the polarity of the permanent magnets. When wishing to make electrical contact through an electric contact means on the multiple relay arrangement, the coil is connected so that current will flow therethrough in one direction appropriate thereto and remaining coils are connected so that current will flow in another direction, wherewith all cores will be magnetized. In the contact making position, the core will be repelled by the permanent magnet on the fixed part and attracted by the permanent magnet on the movable part during its movement. Telecommunications conductors, for instance, can then be mutually connected together to the contact means connected to the movable cores. Remaining cores are attracted and held by the fixed permanent magnets, i.e. do not move, whereas the movable part connected to permanent magnets will be actuated and moved away from the fixed part by the repulsion forces acting between the now fixed cores and the permanent magnets of the movable part. All magnetic forces coact to move the core which is movable in this case with the repelling force and attraction force for the electric contact making function and displacement of the movable part with permanent magnets and with attraction forces for the excluded switching functions but with repelling forces for displacing the movable part with the permanent magnets and the core connected to this part.
REFERENCES:
patent: 5264812 (1993-11-01), Tomono et al.
patent: 5712608 (1998-01-01), Shimomura et al.
patent: 46807 (1909-03-01), None
patent: 129 171 (1950-08-01), None
patent: 343 718 (1968-07-01), None
patent: 359 194 (1971-05-01), None
patent: WO 94/03914 (1994-02-01), None
Burns Doane Swecker & Mathis L.L.P.
Jackson Stephen W.
Telefonaktiebolaget LM Ericsson (publ)
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