DE7540374U - SLIDE RESISTANCE - Google Patents

Description

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Electro-mechanical works

Jakob Preh Nachf

8? 4O Bad Neustadt / Saale d. 15 <»12.1975

P.O. Box 17 ^ 0

10/75 Gbm
Bsch / Gü

Sliding resistance

The innovation relates to a sliding resistor with an elongated housing open on one side, the bottom of which is formed by an insulating plate on which one Resistance and a collector path are attached, and with a movable contact spring carrying a sliding contact Sliding member which slides on two profile rails that are integrally connected to the housing, with molded ones Approaches of the sliding member protrude into two sliding slots located on the top of the housing.

Such adjustable slide resistors are often used in devices in the radio and television industry for setting of operating values, such as the sound, the contrast, the volume, the image holiness, etc., used. The requirement here is that the moveable sliding member be as uniform as possible The pushing force can move in the entire setting range »This applies particularly to the beginning of a setting in the transition from static friction to sliding friction, which should be as smooth as possible. the The contact spring attached to the sliding element can function electrically as well as the resistance and collector tracks to connect with each other, nor serve as a Sremsorgan. The braking effect of the contact spring is sufficient in many In some cases it does not fail to achieve a desired smooth sliding gear. Any increase in spring pressure is not possible due to the increased abrasion of the resistance track. _

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With a known slide resistor, the slide carrying the contact spring is placed on a slide in the middle of the Housing arranged wide flat bar out. There are shallow chambers on the broad side of the flat bar or grooves in which a lubricating grease is introduced.

It is also known to use leaf springs in the sliding member, which are attached to guide rails under slight pretension issue. These adjustable resistors have the disadvantage that an additional Part is needed. This disadvantage is eliminated in a further known sliding resistance, in which the sliding member slides on a guide rail, the sliding member having at least one molded braking element in the form of resilient tongues which are supported on the guide rail. The slider Another known sliding resistor slides between two profile rails. Because the profile rails are in one piece are connected to the housing cover, the additional one is not applicable Operation for inserting and fastening the profile rails. For this, however, the slide consists of a slide carrier plate, the pins of which protrude through the slide slot. By means of the pin, the lower Side of the housing cover a spring carrier attached to the slide carrier plate so that the rails are located between the slide carrier plate and the spring carrier. Since the attachment of both from manufacturing engineering Reasons is only possible with a certain tolerance, the sliding gear and thus a possible one Braking influenced, so that there is no uniform shift gear for all shift resistors.

The innovation has made it its business to address these disadvantages! to avoid and an adjustable resistance too

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create whose braking is the same regardless of manufacturing tolerances for all such sliding resistors and its braking compared to the known slide resistors is improved.

This object is achieved according to the invention in that the profile rails are integrally formed on the housing wall lying between the two sliding slots, and that the resilient extensions that can be deflected away from each other perpendicular to the sliding direction and from the rest position have profiles on the opposite inner sides which, under spring force directed toward one another, form the profile rails Grip around without play, so that a braking effect is exerted in the sliding direction.

In one embodiment of the innovation, the inside of the profile rails are perpendicular to that between the two Sliding slots lying housing wall.

Another embodiment provides that the approaches are longitudinal webs.

Another embodiment has the feature that the longitudinal web on its foot part at least one from the end face extending inward in the sliding direction Has slot.

In yet another embodiment, the profile rails are directly adjacent to the sliding slots.

Another embodiment provides that each profile rail has at least one sliding surface.

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In another embodiment, the profile rails are between the profiles attached to the inside of the housing and a shield.

Another feature of the design is that each profile rail is partially inserted into the sliding slot has protruding longitudinal guide projection which cooperates with an adapted recess of the approach. One Another embodiment provides that each approach has a projection with an adapted recess the profile rail cooperates. The recess can be in both cases be V-shaped and the projection be semicircular.

The innovation unc? further details can be found in the Drawings based on an exemplary embodiment are explained in more detail below.

From the figures shows

Figure 1 is a perspective view of a sliding resistor,

FIG. 2 a view from below of the opened sliding resistor,

FIG. 3 shows a section through the sliding resistor on an enlarged scale,

Figure 4b is a side view of the slide.

The sliding resistor consists of an elongated, pot-shaped housing 1 made of plastic, the bottom of which is covered by a Isolierstoffplatte 2 is formed. At the bottom are on the long sides of the housing webs 3, the Ends thermoformed to attach the insulating plate

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will. The insulating pad could also be made by warming Forming pins or fastened to the housing by snap devices.

As can be seen from FIG. 3, a resistor track k and a collector track 5 are attached to the insulating material plate 2. Fastening can be done in conventional technology by means of rivets or by means of a clamp technique. The respective connections 6 of the resistance and collector tracks protrude from the bottom of the housing. On the top of the housing 1, ribs 7 are formed on the outer edge of the longitudinal sides. A two sliding slots 8 extend parallel to these ribs. Between these ribs 7, a movable sliding member slides in the locking slots 8. The slide 9 of the movable slide member is H-shaped and in its end stop positions elevations 10 of the housing 1, which serve as reinforcement for the attachment of the slide resistor. On the slide 9 resilient racks 11 are formed on the top, A control button (not shown) can be snapped onto using known snap-in technology.

By means of snap noses 12, which are located on the two end walls of the housing, the sliding resistor can e.g. a printed circuit board © snapped on and held

ι be.

Molded-on extensions 13 of the slide protrude through the sliding slots 8, on which a sliding contact spring lk is inserted or fastened by hot deformation of pins. The sliding contact spring itself has the shape of a rectangular frame in which the spring arms 15 protrude inward from the plane of the frame. For better

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I It 11111 ι 111

Contact with the resistance and the collector path are two spring arms each with their contact points intended.

The lugs 13 of the slide slide on profile rails l6, which are formed on the housing wall 17, which is located between the two closing slots 8. The profile bees extend into the interior of the housing perpendicular to the housing wall and are directly adjacent to the sliding slots adjacent. Between the rails is on the inside a shield 18 made of metal is arranged, which is connected by several pins 19 to the housing.

So that the slide 9 can even be snapped into the slide slots during assembly, the approaches 13 can be deflected away from one another in the rest position. Own on opposite insides In this embodiment, the approaches profiles 20, which interact with the profile rails in such a way that after the slider has snapped into place, the projections open the profile rails by means of spring force directed towards one another l6 gripping around without play. This creates a braking effect that acts in the sliding direction, and through the Spring force can compensate for tolerances in production. So that there are any fluctuations in the Distance can be compensated for, have the approaches 13 slot © 21, which extend from the two end faces of the slide extend in the sliding direction. This is particularly important because the approaches at this embodiment are designed as longitudinal webs.

Each rail l6 has a partially in the Sliding slot protruding longitudinal guide projection 22,

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which cooperates with the profile 20 of the approach, the approach in this embodiment on two sliding » surfaces of the longitudinal guide projection is performed. The Profile 20 is V-shaped, while the projection 22 is semicircular.

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Claims (11)

1. Sliding resistor with an elongated housing open on one side, the bottom of which is covered by an insulating plate is formed, on which a resistor and a collector track are attached, and with a one Moveable sliding element carrying sliding contact spring, which slides on two integral rails connected to the housing, with molded Approaches of the sliding member protrude into two sliding slots located on the top of the housing, characterized, that the profile rails (l6) on the between the two Sliding slots (8) lying housing wall (17) are formed, and that the perpendicular to the sliding direction and from the rest position deflectable away from each other resilient lugs (13) on the opposite Inner sides have profiles (20), which under each other directed spring force encompass the profile rails without play, so that a braking effect in Direction of sliding is exerted. 2. Sliding resistor according to claim 1, characterized in that that the profile rails (l6) on the inside perpendicular to the one between the two sliding slots (8) standing housing wall. 3. sliding resistor according to claim 1, characterized in that that the approaches (13) are longitudinal webs. 4 "sliding resistor according to claim 3, characterized in that
that the longitudinal web on its foot part at least one - 7540374 13.05.76 from the front side inwards in the sliding direction having extending slot (21). 5 visual resistance according to claim 1, characterized in that the profile rails (l6) directly the sliding slots (8) are adjacent. 6. sliding resistor according to claim 1, characterized in that each profile rail (l6) has at least one sliding surface having, 7. sliding resistor according to claim 1, characterized in that between the profile rails (l6) on the inside the housing wall has its shield (i8) attached. 8. Sliding resistor according to claim 1, characterized in that each profile rail (l6) is partially in the Longitudinal guide projection protruding from the sliding slot (22) possesses, which cooperates with an adapted recess (20) of the extension (13). 9 »Sliding resistor according to claim 1, characterized in that that each approach has a projection which cooperates with a matching recess in the profile rail . 10. Sliding resistor according to claim 8, characterized in that the recess (20) is V-shaped. - 10 - 7540374 01/13/76 U ₁ IJ «»! -10- 11. Sliding resistor according to claim 8, characterized in that the projection (22) is semicircular 7540374 05/13/76