Metal working – Method of mechanical manufacture – Electrical device making
Patent
1987-07-27
1989-03-14
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29452, 338141, 338302, H01C 1704
Patent
active
048114790
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to potentiometers and potentiometer resistors and a process for producing potentiometer resistors.
BACKGROUND ART
A potentiometer winding of this kind is known from FR-A No. 922 860, for example. With such potentiometer winding a cylindric or toric contact surface results. In order to ensure safe contact between potentiometer winding and slider with such a potentiometer winding, also when the slider moves quickly, expensive slider constructions are necessary (e.g. of the type of DE-A No. 3,413,741). Hereby the potentiometers become costly.
From GB-A No. 567 129 a process for producing wire resistance strain gauges is known. Wire resistance strain gauges comprise a wire which is applied to a carrier of paper and which is fixedly cemented by a special bonding agent on the surface of an element the extension of which is to be measured. When the examined element is extended, also the wire is extended and changes its electric resistance. This change of resistance is normally converted into an electric signal by a bridge circuit. In order to make the change of the resistance which can be achieved with a predetermined extension and predetermined length as large as possible the wire in such wire resistance strain gauges is arranged zigzag. GB-A No. 567 129 relates to a process for producing such wire resistance strain gauges as economically as possible. For that purpose, the wire is wound helically in one layer on a cylindric paper roll and is then flattened together with the paper roll.
This does not concern a potentiometer, not a solid carrier and not the problem of obtaining a flat contact surface for the slider in a potentiometer.
DISCLOSURE OF THE INVENTION
It is the object of the invention to provide a potentiometer winding at low costs, such that a contact surface is formed which allows always a close contact also with a slider having a less expensive construction, e.g. a brush slider.
According to the invention this object is achieved, with a potentiometer wherein a winding is wound around a solid core having a circular cross-section, the core with the winding wound thereon subsequently is deformed by pressure between flat surfaces, such that a flat contact surface is formed.
Thereby a flat contact surface is obtained with a brush type slider, that means a slider having a plurality of contact fingers which are arranged side by side and which are connected with each other, can engage throughout its whole width. Thereby a close contact is ensured, because always at least some of the contact fingers of the brush type slider are in close contact with the potentiometer resistor. The winding can be easily wound regularly around the core having a circular cross-section. By the deformation stretching of the wire is effected. The resistance of the potentiometer winding becomes higher. But this can be pre-calculated. It has been found that this deformation does not affect the remaining function of the potentiometer winding.
The process is described in further detail hereinafter with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic-perspective view of a potentiometer winding which is wound, in conventional manner, around a toric core having a circular cross-section.
FIG. 2 schematically-perspectively illustrates the deformation process.
FIG. 3 is a schematic-perspective view of the deformed potentiometer winding.
FIG. 4 is an explored perspective illustration of a potentiometer having a potentiometer winding produced according to FIG. 1 to 3.
BEST MODE OF CARRYING OUT THE INVENTION
In FIG. 1 numeral 10 designates a cut up toric solid core, which has a circular cross-section. A winding 12 is wound around that core 10 in conventional and therefore not illustrated manner.
As illustrated in FIG. 2 the core 10 with the winding wound thereon is subsequently deformed together with the winding 12 by pressure between flat surfaces 14 and 16. That is indicated by the arrow 18.
Thereby a potentiometer resistor 32 as illustrated in
REFERENCES:
patent: 1767716 (1930-06-01), Stoekle
patent: 2221235 (1940-11-01), Ganci
patent: 3413588 (1968-11-01), Ferrell
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