Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
1998-03-27
2001-07-17
Cuchlinski, Jr., William A. (Department: 3661)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C333S012000, C333S185000, C336S092000, C336S175000, C336S176000
Reexamination Certificate
active
06262361
ABSTRACT:
TECHNICAL FIELD
The invention relates to a device for absorbing electrical noise with the aid of elements made from a noise absorbing or noise preventing material placed around an electrical cable.
DESCRIPTION OF THE BACKGROUND ART
It has long been known that with the aid of ferromagnetic elements it is possible to reduce electrical noise on the line. See U.S. Pat. No. 3,462,715, for example.
It is also known to make such ferromagnetic material elements in split form, so that they can be subsequently fitted to a cable. The two parts must be in contact so that the action is effective.
This can be brought about as disclosed in EP Published App. No. 0452992 A2 by placing the two half-elements in a casing, whose bases have elastic pretensioning means pressing the two magnetic elements onto one another.
The problem to be solved by the invention is to provide a device for absorbing electrical noise, which has a simple construction and in which the insertion of the elements of a noise absorbing or noise preventing material is easy.
SUMMARY OF THE INVENTION
In the device of the present invention, two casing half-shells with the noise preventing or absorbing material elements located therein are fitted to an electrical cable in which noise is to be reduced. This can take place by folding together or assembling the two casing half-shells.
If the two elements are subsequently inserted in the previously manufactured casing half-shells, fitting takes place in such a way that initially the two elements made from the material are inserted in the two casing half-shells and each is subsequently secured by a respective web. The web thereby traverses the present semicylindrical groove of the ferromagnetic element. As a result, the two casing half-shells can be assembled around the electrical cable.
The interconnection of the two casing half-shells can take place by means of snap-on devices or in any other way, by an adhesive tape, wire or the like placed around the outside of the casing.
In particular, in a further development, for locking the casing one casing half-shell is provided with a tongue having a tooth system and which cooperates with a tooth system on the other half-shell. As a result of the fine tooth system the casing can be locked in finely graduated positions, so that it is possible to compensate for tolerances in the manufacture of the ferromagnetic elements.
It is possible to fit such tongues and tooth systems to both longitudinal sides or both end faces. The tongues can in particular be so positioned that they also bring about a reciprocal alignment of the two casing half-shells.
The tooth systems are so chosen that they have a sawtooth configuration, to prevent unintentional release.
It is also possible to interconnect the two casing half-shells by a film hinge on each longitudinal side thereof, so that they can then be folded from the open into the closed state an open position to a closed position. Here again, a tongue and tooth system is possible for locking the half-shells.
For angular alignment of one of the two ferromagnetic elements, a rigid and, in particular, rounded projection, which preferably extends over the entire casing length. The outside of the ferrite element then rests on the projection and can then tilt within certain limits about its longitudinal axis.
According to a further development of the invention the web, which is used for fixing the ferrite elements, can be in the form of a semicylinder, so that in the assembled state the webs in the two half-shells form a closed cylinder, which completely covers the inside of the semicylindrical grooves of the ferrite elements. In the closed state the longitudinal edges of the two semicylinder webs engage on one another and consequently hold the webs in position.
For fixing the device to the electrical cable, according to the invention at least one of the webs forming the fixing device can have an inwardly directed projection for fixing the cable. This projection can have an elastic construction. It is also possible for the two webs, particularly the two semicylinders, to have such a projection, which is preferably centrally positioned.
According to a further development of the invention the webs can be laterally insertable into the casing half-shells. It is also possible and is proposed that the web is connected by means of a film hinge to one end of a casing half-shell.
Further features, details and advantages can be understood from the following description of a preferred embodiment of the invention in which reference is made to the drawings, which form a part hereof and which show:
REFERENCES:
patent: 3462715 (1969-08-01), Schor
patent: 4970476 (1990-11-01), Kitagawa
patent: 4972167 (1990-11-01), Fujioka
patent: 4983932 (1991-01-01), Kitagawa
patent: 3932021 A1 (1990-04-01), None
patent: 4004211 A1 (1990-08-01), None
patent: 4104100 A1 (1991-09-01), None
patent: 4137859 A1 (1992-05-01), None
patent: 4302650 A1 (1993-08-01), None
patent: 94 08 883 (1994-09-01), None
patent: 3932021 C2 (1995-07-01), None
patent: 0452992A2 (1991-10-01), None
Cuchlinski Jr. William A.
Mancho Ronnie
Quarles & Brady LLP
Wurth Elektronik GmbH & Co. KG
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