Electrical resistors – Mechanically variable – Movable contact electrically adjustable over length of...
Patent
1987-09-28
1989-05-16
Goldberg, E. A.
Electrical resistors
Mechanically variable
Movable contact electrically adjustable over length of...
338163, 338164, 338171, H01C 1032
Patent
active
048313556
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an arrangement for establishing electrical contact with resistance paths.
BACKGROUND ART
In particular, the invention is directed to the problem of connecting potentiometer windings, passing taps out from potentiometer windings and providing short-circuit intervals at potentiometer windings what is required in some applications. According to prior art such connections are established by soldering tin. This involves expensive procuction and with crome nickel wires, for example, is possible with greatest difficulties only. Also establishing extended short-circuit intervals becomes very expensive.
By U.S. Pat. No. 3,377,606, a potentiometer is known having a circular housing bottom formed as synthetic plasic part made by injection moulding, in which housing bottom a coiled arcuate resistance body is located. Connection contact pins are embeded in the housing bottom by injection moulding. Contact pieces formed as punched elements made of sheet metal are connected to the resistance body and to the connection contact pins and are located in recesses of the housing bottom. A covering element consists of a ductile outer element in the form of a metal sheet element and a rubber-resilient coating located in this ductile outer element. The covering element is connected to the housing bottom by beading. Thereby the rubber-resilient coating effects sealing. Besides the rubber-resilient coating, on the opposite side of the contact pieces, engages the resistance body. Hereby the resistance body is held in the housing.
DISCLOSURE OF THE INVENTION
Therefore, it is an object of the invention to provide an arrangement for establishing electrical contact with resistance paths, which arrangement can be produced simply and permits easy adaption to the requirements of the respective cases of application.
According to the invention this object is achieved by
(a) a base of electrically non-conductive and resiliently deformable material,
(b) an electrically conductive coating applied to the base, and
(c) means for pressing the resistance patch against this layer, the base being subjected to preload.
Modifications of the invention are subject matter of the sub-claims.
BRIEF DESCRIPTION OF THE INVENTION
An embodiment of the invention is described in further details with reference to the accompanying drawings:
FIG. 1 is a perspective illustration and shows an arrangement for establishing electrical contact with a potentiometer or resistance winding.
FIG. 2 is a sectional view of the potentiometer.
PREFERED EMBODIMENT OF THE INVENTION
The arrangement for establishing electrical contact with resistance paths 10, in this case a potentiometer or resistance winding, comprises a base 12 made of electrically non-conductive and resiliently deformable material. In the described embodiment, the base 1 is a disc made of rubber. Naturally also a similar synthetic plastics disc can be used. An electrically conductive coating is applied to the base. In the preferred embodiment, this electrically conductive coating consists of a conductive silver layer which is applied to the base 12 by means of silk screen-printing. In the described embodiment, the electrically conductive coating comprises arcuate sections 16 and 18 in the area of the ends of the potentiometer winding forming the resistance path 10 and, adjacent thereto, tongues 20,22 extending radially outwards. Furthermore the electrically conductive coating comprises an arcuate section 24 in the central area of the potentiometer winding forming the resistance path 10. This arcuate area is relatively long and forms a short-circuit interval. Besides the electrically conductive coating has a tongue 26 connected to the arcuate section 24 and extending radially outwards. The resistance path 10 is placed on the base 12 such that the arcuate sections 16, 18 and 24 engage the bottom of the resistance path 10.
The resistance path 10 with the base 12 is supported on a housing base plate 28.
Flat connection contacts 30 or 32, respectively, (Faston conne
REFERENCES:
patent: 3772629 (1973-11-01), Meylan-Rochet
Goldberg E. A.
Lateef M. M.
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