Electricity: circuit makers and breakers – Multiple circuit control – Reciprocating contact
Patent
1985-07-16
1987-02-10
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Reciprocating contact
200277, H01H 1506, H01H 116
Patent
active
046424270
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a slide switch arranged on a circuit board having printed circuits or printed strips on a surface thereof.
BACKGROUND OF THE INVENTION
Contact arrangements suitable for use in conjunction with printed circuit boards have previously been disclosed. Thus, for example, spring members which are forced down manually against electrically conductive strips and into contact with the strips have been disclosed. When the manual force ceases to be applied, the aforementioned contact will also cease. Also previously disclosed is an arrangement of switching members which, subject to the application of force, will present the aforementioned spring members for the purpose of establishing the aforementioned contact and/or for interrupting the contact. Also the use of groups of springs with contact springs on the circuit board has been proposed.
SUMMARY OF THE INVENTION
Technical Problem
There exists a need in conjunction with contact arrangements of this kind to be able to produce them with small dimensions and with accurate and well defined positions for the contacts in question. It is also desirable for the contact arrangement to be so constructed as to provide the contact interaction directly on the circuit board.
There also exists a need for a contact arrangement to be capable of being constructed so that small frictional losses and thus a minor tendency to wear will occur during the application of the forces for establishing contact.
Solution
The present invention has as its principal object the presentation of an arrangement which will solve the problem outlined in the above. What may principally be regarded as being characteristic of the novel contact arrangement is that one or more contact rollers are so arranged as to be capable of movement relative to the printed surface in such a way that each roller is capable of interacting with the circuits so as to close, or open, depending on the positional displacements of the contact roller between parts of the circuit.
In a preferred embodiment each roller is constructed with two roller contact paths which are connected together by means of a shaft. Preferably each roller contact path is allocated its own printed line on the contact surface.
In a preferred embodiment each contact roller is also so arranged as to be capable of movement along a straight path over the card surface in question. Preferably each roller contact path is allocated a printed strip including a straight part which coincides with the straight path of the roller contact path. Each printed strip can be so arranged as to exhibit an angled section near its own straight part. Similarly each straight part can be provided with one or mroe interruption sections. Furthermore one or more straight parts can start and/or end at different distances from one of the edges of the card, and different straight parts which belong to different circuits can form part of one and the same path.
Each strip on the card is connected to an external line, while the contact-establishing, contact-switching and/or contact-interrupting roller should preferably not be connected to any external line.
In a preferred embodiment the contact rollers are mounted on a slide so arranged that the contact rollers interact with the aforementioned circuits by the application of pressure. The slide can in this case be arranged inside a slide housing which is provided with a part extending over the surface of the card. The slide in this case has a member capable of interacting with the under surface of the aforementioned part which applies the aforementioned pressure.
Advantages
The use of the novel contact arrangement enables the contact roller or contact rollers to be moved over the printed circuits on a card, and the same contact roller can be used to close and interrupt plural strips without itself required to be connected to a specific strip. The contact roller also differs from the previously disclosed contact rollers in that it rolls against the contact surface of the
REFERENCES:
patent: 2521468 (1950-09-01), Lodge
patent: 3592983 (1971-07-01), Kroll et al.
patent: 3639708 (1972-02-01), Wolniak et al.
patent: 4016401 (1977-04-01), Delaage
Engstrom Ake
Karlsson Goran
Kratz Christer
Scott J. R.
Televerkets Huvudrontor
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