DE1790163C3 - Small potentiometer with an elongated cuboid housing that can be closed by a housing cover - Google Patents

Description

60 rail as well as the opposite ends, the ends the rod-shaped resistance winding

Menden contact elements with the housing base

outwardly protruding contact lugs are provided.

65 Finally, the assembly of the small

The invention relates to a small potentiometer with potentiometers thereby facilitate, simplify and unc an elongated, accelerate by a housing cover that dei in an advantageous embodiment closable cuboid housing, the one in the invention of the sliding contact the screw spindle

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"Only partially enclosed and two diametrically opposed, partially cylindrical guide surfaces See who carry the contact arms through emen wide axial gap separated and groove into the

SJSi ^ SSR ^s; 7 ^{f; de} ; 2 partial area 42 harbors At the time flag 32, the <Jha ^ bo points _{up to the} projection ™ *

liTiS?. * - *. Darste ,, u " _g te BJ parts one. Potentiotnelers in enlarged ", scale F i E 2 and 3 a side view and the ground plan of the p ⁸ oe" U.me. = r _S ", ch Fig. In a smaller MB-

^S 'ti, 4 a L ^ K _n U, de,

greatly increase ^S = rlem scale according to L, n, e

Cross-sections through

^ ⁷

^ screw lockers, » J - * -

* - gSSSSJS "Kunsuto" J ^ icherten Mimehmemrbinden ζ "**" S _{di Sc)} , _rough lockers 52 on hers

"™ _e Lpf 54 -Be ^ '" f ™ ^ ™

from _a d, ingt an se, ner

^D execution of a potentiometer according to the Erftn

daily .0 a cross-section along line 10-10 of ^F F ⁸ i ⁹ _a Π an end view of a sliding contact ^ _{64 between the} wall ^^ emcm etewä ^ «gjd ^ protrusion ^ _{pwnidiiel | ung gesi} .

* 5 chert. _{the screw} p _ind el 26 is located

Fig. 17 is a partial view of the Antnebssp.ndel des ner ^ ^s _{hraubcnspin (ld 52} is. The same SXSZ-, according to Fig-1 to 8 white, a G, J * - * ^ gj ^^ i

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Screw spindle 2 «is a sliding contact M to screw« »P«

end up

siuende Schlei,

project through the housing floor 22 and to ^he below Si ° ^"rS FSschiene 24 consists of Federb.ech and W _{UNJ" j}

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a flax leg 80 ver ^ comes

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flat part of the surface 42 aul, the one with the first Nocte. 84 _{r Schrau "inde, 26"} the inner

_ig . _{6 is, th} e screw 52 in the overall

^{4 d} " ^{n8 28}

ordered and lies in the transverse direction of the housing between the resistance winding 28 and the Flat bar 24. The sliding contact 30 is through its web 80 and its arm 82 against rotating in secured in both directions when turning the screw spindle 26. The bar-shaped resistance winding 28 is held in semicircular bearing lugs 86 of the contact lugs 34 and 36. The ends 88 of the bearing lugs 86 are bent outward and have inwardly protruding tongues 90, the one Longitudinal displacement of the resistance winding 28 in the bearing lugs 86 of the contact lugs 34 and 36 impede. The contact lugs 34 and 36 are also provided with upwardly projecting flat webs 92, which engage with upper tips 93 in the housing cover 20 when the housing is being assembled be able. The flat webs are tapered at their lower ends 94 and each protrude through an associated one Slot 96 in the bottom of the housing (see Fig. 1) with an interference fit.

The housing cover 20 is on its inner surface along its edges with a downwardly protruding. V-shaped sealing rib 100 is provided, which extends on an inwardly projecting step 102 of the housing walls supports. Above this gradation, the housing cover 20 is surrounded by a web 104 of the housing walls bordered. When assembling the housing, the upper tips 93 penetrate the contact lugs 34 and 36 and the upper tips 46 of the flat bar 24 in the lower surface of the housing cover one. Preferably, the sealing ribs 100 of the housing cover 20 are then heated and melted so that they fill the column 103 (see Fig. 6). Fig. 15 shows the finished state, in which the protective ribs 100 are melted all around to form a shrink layer 110.

In the modified version according to FIG. 9 to 14, the sliding contact 112 has a different shape. It is bent into a U-shape and has on its web 114 two legs 116 and 118, which on their Ends are provided with outwardly pressed contact lugs 120. These cams are according to F i g. 10 on the surface 42 of the flat rail and on

ίο of the resistance winding 28. The web 114 of the Sliding contact is partially cut out and has two inner ones bordered by the cutouts Legs 124 which are bent inward in a semicircle and at their inner ends according to FIG. 11th and 12 have inwardly projecting guide cams 126. These guide cams engage in the thread groove of the screw spindle 26.

The parts can be easily assembled. Here you need the flat bar 24, the con-

ao clock flags 34 and 36 or 128, the rod-shaped Resistance winding 28 and the screw spindle 26 with the sliding contact previously attached to it only to be inserted into the housing 16 from above in this order, after which the housing closed with the lid 20, the lid by ultrasonic welding permanently attached and possibly also the passage slots of the contact lugs 32, 34 and 36 or 128 sealed with a liquid adhesive. The outwardly protruding head 54 of the Because it is made of plastic, the screw spindle is insulated for the user. ,

Patent protection is only sought for the entirety of the features of each claim, that is including its back relationship.

1 sheet of drawings

Claims (3)

whose longitudinal direction is arranged, rod-shaped claims: Resistance winding which is at its ends with contact elements in engagement, also one of the resistance 1. Small potentiometer with an elongated, parallel winding, opposite KoI-through a housing cover closable 5 lektorschiene and one parallel to both parts cuboid housing, the one in its screw spindle for driving a sheet metal press Longitudinally arranged rod-shaped counter-trained sliding contact contains which the Stand winding, which be elements at their end with contact resistance winding and the collector rail is engaged, one of the resistance stirs. winding parallel opposite KoI- io Such small potentiometer with an elongated lector rail and a housing parallel to both parts, from which only the power connection terminals Screw spindle to drive one as sheet metal and the head arranged on the end face one for the pressed part trained, the resistance winding provide the sliding contact serving screw and the grinding spindle in contact with the collector rail protrude outwards are known per se, and Contains contacts, thereby also marked 15 as a Kieinpotentiometer with accordingly net that the collector rail has a very small dimension (USA.-Patent at an angle to the housing base (22), from 3 051921). The invention is directed to a to train this to the housing cover (20) reaching such a small potentiometer so that it resilient flat rail (24) is made, which is particularly easy on one with reduced assembly work Longitudinal wall (18) of the housing (10) arranged * ° and quickly by simply plugging the parts together at their housing cover (20) facing can be assembled in such a way that the unKante in the housing with an individual part brought in parallel to the longitudinal wall (18), a reliable and positional one have first partial surface (38) on this longitudinally secure fastening, without additional Befewand (18) rests against which one in the blunt sweetener need to be. Angle to this longitudinal wall (18) housing a- «5 This task is performed with a small potentiometer downwardly protruding, second flat partial surface (40) and the above-mentioned embodiment according to the invention this is a third flat partial surface (42) to size solved by the fact that the collector rail from closes, which with the second one standing to the longitudinal one at right angles to the bottom of the case, wall (18) open obtuse angle from this to the housing cover closes and with her the housing base (22) 3 <> resilient flat rail that. arranged on a longitudinally facing edge (44) between the longitudinal wall of the housing, on its housing wall (18) and one of these closely adjacent, sedeckel-facing edge with an edge parallel to First partial surface on the housing protruding into the housing and lying in one piece with the longitudinal wall Housing floor (22) formed terminal strip (48) rests on the longitudinal wall, to which a in the butted Winfedernd is jammed and that both the flat 35 angle to this longitudinal wall protruding into the housing, rail (24) as well as the opposite, second flat partial surface and a third on this the ends of the rod-shaped resistance winding are connected to the flat surface area with the second (28) receiving contact elements (86) with an obtuse angle open to the longitudinal wall Tips (46, 93) are provided, which includes the and with their bearing approaches to the housing bottom (70, 72) provided flat turned edge between the longitudinal wall and a housing cover (20) by penetrating the cover, these closely adjacent, protruding into the housing, Define the material. formed in one piece with the housing base 2. Small potentiometer according to claim I, since the terminal strip is resiliently clamped and that both characterized in that both the flat rail and the rail opposite it (24) as well as those opposite to it, the ends of the rod-shaped resistance winding Ends of the rod-shaped resistance winding ment receiving contact elements with tips (28) receiving contact elements (86) are provided, which are provided with bearing lugs the housing base protruding outwardly through the flat housing cover by penetrating into the Contact lugs (32, 34, 36) are provided. Determine the cover material. 3. Small potentiometer according to claim 1 or 2, 50 In this embodiment of the small potentiometer, characterized in that the sliding contact can be the collector rail before placing the (30, 112) the screw spindle (26, 52) only partially behind the housing cover located on the bottom of the housing and insert two diametrically opposed terminal strips and receives its upper support on the associated longitudinal (74, 76 or 124) through overlying, partially cylindrical guide surfaces, which wall the contact arms 55 of the housing and through its additional fixed ( 80, 82; 116, 11 ″), a reliable axial gap is separated by a wide laying with the housing cover and with in the thread stop. The cohesion of the parts can additionally engage the groove of the screw spindle (26, 52) - even better by the fact that the driver webs (78, 126) are advantageously provided. Embodiment of the invention both the flat