DE2432687C3

DE2432687C3 - Adjustable resistance

Info

Publication number: DE2432687C3
Application number: DE19742432687
Authority: DE
Inventors: Matsuo Oka Shunzo Hirakata Nishioka (Japan)
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1973-07-09
Filing date: 1974-07-08
Publication date: 1977-09-22

Description

gers 6 vor. Er ist an seiner Unterseite offen und erstreckt sich teilweise bis innerhalb der abgestuften Seitenwand 4 des Bodenteils 3. Das mit der Scv.icbestange 16 verbundene Nockenbetätigungsglied 17 erstreckt sich in den Raum innerhalb des Rollenträgers 19. Außerdem befindet sich im Rollenträger 19, von diesen! drehbar getragen eine Rolle 20 mit einem drehbaren Stift 21 aus leitendem Material. An der Oberfläche der Rolle 20 ist ein Kontaktstück 22 aus leitendem Material befestigt, das in elektrischer Verbindung mit dem drehbaren Stift 21 steht.gers 6 before. It is open at its bottom and extends partially within the stepped side wall 4 of the bottom part 3. The cam actuator 17 connected to the Scv.icbestange 16 extends in the space within the roller carrier 19 is also located in the roller carrier 19, of these! rotatable carried a roller 20 with a rotatable pin 21 of conductive material. On the surface of the roller 20 is a contact piece 22 of conductive material attached which is in electrical communication with the rotatable pin 21 stands.

Mit einer Seite der Rolle 20 ist einstückig ein Nocken 23 verbunden. Das geschieht derart, daß das Nockenbetätigungsglied 17 der Schiebestange 16 in unmittelbarer Nachbarschaft zum Nocken 23 liegt. Der Nocken 23 ist bezüglich der Achse der Rolle 20 exzentrisch. Am drehbaren Stift 21 ist eine Zuleitungsfeder 24 befestigt, die zwischen der Rolle 20 und dem Rollenträger 19 für deren elektrische Verbindung sorgt. Ein Kontaktstück 25 dient dazu, über eine an der Innenseite der linken Seitenwand (Fig. 2). des Bodenteils 3 angeordnete leitende Platte 26 den Rollenträger 19 elektrisch mit einem ortsfesten Anschluß 27 zu verbinden, der an der Außenseite der gleichen Seitenwand sitzt. Über dem Boden des Bodenteils 3 erstreckt sich in der selben Richtung wie das Widerstandselement 10 eine elektrisch leitende Schiene 28. Die Schiene 28 ist federnd elastisch. Sie hat eine auf dem Bewegungsbereich des Kontaktträgers 6 abgestimmte Länge und steht in Kontakt mit der Rolle 20. Mit ihr ist eine weitere Schalterklemme 29 verbunden, die außerhalb des Gehäuses vorgesehen istA cam 23 is integrally connected to one side of the roller 20. This is done in such a way that the cam actuator 17 of the push rod 16 is in the immediate vicinity of the cam 23. The cam 23 is eccentric with respect to the axis of the roller 20. A feed spring 24 is attached to the rotatable pin 21, which ensures the electrical connection between the roller 20 and the roller carrier 19. A contact piece 25 is used via a on the inside of the left side wall (Fig. 2). of the bottom part 3 arranged Conductive plate 26 to electrically connect the roller carrier 19 to a fixed terminal 27 which is attached to the Sitting outside of the same side wall. Above the bottom of the bottom part 3 extends in the same Direction like the resistance element 10, an electrically conductive rail 28. The rail 28 is resiliently elastic. It has a length adapted to the range of motion of the contact carrier 6 and is in contact with the Roller 20. It is connected to a further switch terminal 29, which is provided outside the housing

Die beschriebene Anordnung arbeitet wie folgt:
Zur Einstellung des Widerstandes wird der Kontaktträger 6 mit Hilfe des Handgriffes 9 verschoben. Mit der Bewegung des Kontaktträgers 6 gleiten die an seiner Unterseite befestigten Bürsten 12 über das Widerstandselement 10 bzw. das Kontaktstück U. Auf diese Weise kann der gewünschte Widerstandswert zwischen den Klemmen 13 und 14 eingestellt werden.The described arrangement works as follows:
To adjust the resistance, the contact carrier 6 is moved with the aid of the handle 9. With the movement of the contact carrier 6, the brushes 12 attached to its underside slide over the resistance element 10 or the contact piece U. In this way, the desired resistance value between the terminals 13 and 14 can be set.

Gleichzeitig mit der unter Gleitreibung erfolgenden Bewegung des Kontaktträgers 6 rollt die Rolle 20 über die Schiene 28. Wird die Schiebestange 16 entgegen der Vorbelastungskrafi der Feder 18 in irgendeiner gewünschten Stellung des Kontaktträgers 6 nach unten gedrückt, so kommt die abgeschrägte Fläche des Nockenbetätigungsgliedes 17 in Berührung mit dem Nocken 23. Durch weiteres Niederdrücken der Schiebestange 16 wird der Nocken 23 verschoben, so daß sie die Rolle 20 gleichzeitig mit dem Nocken 23 dreht, ohne daß der Kontaktträger 6 sich hierbei bewegt. Schließlich kommt das am Umfang der Rolle 20 befindliche Kontaktstück 22 in Berührung mit der elektrisch leitenden Schiene 28.Simultaneously with the movement of the contact carrier 6 taking place under sliding friction, the roller 20 rolls over the rail 28. If the push rod 16 against the preload force of the spring 18 in any desired position of the contact carrier 6 pressed down, so comes the beveled surface of the Cam actuator 17 in contact with the cam 23. By further depressing the push rod 16, the cam 23 is displaced so that it rotates the roller 20 simultaneously with the cam 23 without the contact carrier 6 moves here. Finally, that located on the periphery of the roller 20 comes Contact piece 22 in contact with the electrically conductive rail 28.

F i g. 3 und 4 veranschaulichen die Funktion beim Niederdrücken der Schiebestange 16. Sind zwischen den Anschlüssen 27 und 29 eine Lampe 30 und eine Spannungsquelle 31 in Reihe geschaltet, so wird die Lampe 30 aufleuchten, sobald das Kontaktstück 22 in Kontakt mit der elektrisch leitenden Schiene 28 kommt. Wird anschließend der Kontaktträger 6 bewegt, nachdem die Druckbeaufschlagung der Schiebestange 16 beendet worden ist, so trennt sich das Kontaktstück 22 von der elektrisch leitenden Schiene 28 aufgrund des Rollens der Rolle 20 mit der Bewegung des Kontaktträgers 6. Die Lampe 30 wird demnach ausgeschaltet.F i g. 3 and 4 illustrate the function when depressing the push rod 16. Are between the Connections 27 and 29 a lamp 30 and a voltage source 31 connected in series, so the Lamp 30 light up as soon as the contact piece 22 comes into contact with the electrically conductive rail 28. The contact carrier 6 is then moved after the push rod has been pressurized 16 has been completed, the contact piece 22 separates from the electrically conductive rail 28 due to the Rolling of the roller 20 with the movement of the contact carrier 6. The lamp 30 is therefore switched off.

Wird nun die Rolle 20 wieder in die zuvor gewählte Stellung gebracht, so berührt neuerlich das Kontaktstück 22 die Schiene 28 und die Lampe 30 wird wieder eingeschaltet. Es ist also die zuvor gewählte Stellung des Kontaktträgers 6 aus dem Aufleuchten der Lampe 30 ohne Schwierigkeiten erkennbar. Wird das Kontaktstück 22 durch Niederdrücken der Schiebestange 16 in einer anderen Stellung des Kontaktträgers 6 festgelegt, so brennt die Lampe an dieser Stelle.If the roller 20 is now brought back into the previously selected position, it touches the contact piece again 22 the rail 28 and the lamp 30 is switched on again. So it is the previously selected position of the Contact carrier 6 from the lighting of the lamp 30 can be seen without difficulty. Becomes the contact piece 22 fixed by pressing down the push rod 16 in a different position of the contact carrier 6, so the lamp burns at this point.

Auf diese Weise erhält man eine Stellungsanzeige entsprechend einer gewünschten Lautstärke, eines Abgleichs od. dgl. die jederzeit leicht wieder aufgefunden werden kann. Damit nur eine einzige erinnerlich gemacht oder gespeichert wird, sollte der Drehwinkelbereich der Rolle 20 kleiner als 360° sein. Wenn es also erwünscht ist, nur eine einzige vorgewählte Stellung zu speichern, dann ist der Verschiebungsbereich des Kontaktträger so zu wählen, daß der Bereich des Drehwinkels der Rolle 20 kleiner als 360° ist.In this way, a position indicator corresponding to a desired volume is obtained, one Adjustment or the like that can be easily found again at any time. So only one can be remembered is made or saved, the rotation angle range of the roller 20 should be less than 360 °. So if it is If you only want to save a single preselected position, then the shift range is the To choose contact carrier so that the range of the angle of rotation of the roller 20 is less than 360 °.

Bei der beschriebenen Ausführungsform ist die elektrisch leitende Schiene 28 ausreichend federnd, um eine weiche Rotation der Rolle 20 in Übereinstimmung mit dem Nocken 23 sicherzustellen, ohne daß jemals während des Niederdrückens der Schiebestange 16 eine Bewegung des Kontaktträgers 6 hervorgerufen würde.In the embodiment described, the electrically conductive rail 28 is sufficiently resilient to ensure smooth rotation of roller 20 in unison with cam 23 without ever a movement of the contact carrier 6 would be caused during the depression of the push rod 16.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Patent claims:

1. Adjustable resistance with a position indicator for the adjustable resistance value and with a movable along the resistance element contact carrier on which with the Resistance element electrically engaged contacts, as well as an actuator for one electrical switches are provided, and in which the switch is mechanically connected to any adjustable resistance value can be fixed, characterized in that the actuating element a roller (20) made of insulating material, the circumference of which is greater than the length of the Resistance element (10) and on the periphery of which a contact piece (22) is provided which has a Slider assembly (21, 24) is electrically connected to a fixed connection (27), and that the arranged on an electrically conductive rail (28) under resilient mutual bracing Roll (20) on the rail when adjusting the contact carrier (6) rolls and independently of it is rotatable by means of a rotary actuator (16), and from the rail (28) and the Contact piece (22) a circuit can be closed, in which a lamp (30) as a position indicator device is in series with a voltage source (31).

2. Adjustable resistor with position indicator according to claim 1, characterized in that that the rotary actuator of the roller (20) consists of a vertically movable push rod (16), which is arranged on the movable contact carrier (6), and on one side of the roller (20) a cam (23) is attached coaxially to this, on which a cam actuating member (17) of the push rod (16) attacks.

3. Adjustable resistor with position indicator according to claim 2, characterized in that that the cam actuator (17) provided at the lower end of the push rod (16) has a beveled Has end face that is used to convert the axial movement of the push rod into a Rotational movement of the roller (20) is in contact with the circumferential surface of the cam (23).

An adjustable resistor with a position indicator according to the preamble of claim 1 is known (GB-PS 10 04 622). Here is the Position indicator for a certain preset resistance value in relation to the Dimensions of the resistance element itself very bulky and complex in terms of mechanical parts. In addition, it is difficult to save a setting and find it again.

Therefore, the object of the invention is to design a resistor of the type mentioned at the outset in such a way that that the setting position of a selected resistance value can be saved and the achievement of this Setting can easily be recognized again. This task is given by the one specified in claim 1 Invention solved. Appropriate refinements can be found in the subclaims.

It can be seen that here the setting of a certain variable resistance can easily be found again. The ^ch tteisp? El _{S is} then of considerable advantage if there is an adjustable resistance for the control Z 1 or the adjustment of the associated? -ΪΪ Ve should find a twist. Because of the possibility: STÄSSmngund the easy retrieval * S it is not necessary to visit a Horein-SeSnR once again with difficulty. The Ge "it is also constructed in a simple and space-saving manner. The etpiiune display device is located in close proximity to the resistance and the setting device is included. In this way, an adjustable resistance with a position display device is obtained In terms of structure and operation, it is well suited for numerous devices.

In the drawing, the invention is illustrated by way of example, namely show

1 shows a longitudinal section through an ^{embodiment of} FIG. 2 shows a cross section through the embodiment ^V ° Fi ^F g.3 and 4 representations to explain the function of the role, and

Fi E 5 the circuit of the adjustable resistor. F i s 1 and 2 show an adjustable resistor with a metal housing 1 of channel-shaped cross-section, in the upper side of which there is an elongated opening in the form of a slot 2. The metal housing 1 is supplemented by a bottom part 3 with a stepped side wall 4 which, like all parts, are designed in accordance with that shown in the figure

A contact carrier 6 is arranged in the metal housing 1 and has grooves 7 on its two longitudinal sides has, with the help of which he is on the upper edges 8 of the Bottom part 3 or its side walls slides. From the top of the movable contact carrier 6 stands a handle 9 through the slot 2 upwards.

On the bottom part 3 or on the step of its side wall 4, a resistance element 10 and a contact piece 11 are mounted from the underside of the contact carrier 6 protruding brushes 11 are with these parts in Contact To connect resistor element 10 and contact piece U, terminals 13 and 14 are provided and passed through the side wall 4 to the outside. Between the contact carrier 6 and the A spring 15 is also used on the underside of the upper wall of the metal housing 1.

Vertically movable relative to the displaceable contact carrier 6 and a push rod 16 is provided through it. One end of the push bar 16 is passed through the slot 2, while the other end over the underside of the contact carrier protrudes and is provided there with a cam actuator. The cam actuator 17 is on the In the manner shown in the figure provided with an inclined end face. The push rod 16 is of a spring 18 urged upwards, which protrudes on its from the top of the contact carrier 6 Part sits. The cam actuator 17 also serves as a stop which prevents the push rod 10 from following is pulled out at the top. .

A rectangular hollow roller carrier 19 made of conductive Material protrudes from the underside of the contact