DE1923659B2 - ADJUSTABLE ELECTRICAL RESISTANCE - Google Patents

Description

1 sheet of drawings

Claims (1)

-7 . Each service part and also causes an unwieldy patent claim: Hch? -Operation. Per invention the task is based on em By means of a rolling wheel adjustable electric roll potentiometer without the mentioned disadvantages Resistance to build its roller wheel over an intermediate 5. . between member with a firmly connected to the housing. This object is achieved according to the invention which rack is in engagement and both solves that the intermediate link from a ring gear bedas rolling wheel is licked a grinder part, which is connected to the rolling wheel via a Mitnahmerzap by turning the rolling wheel with a contact part fen and on one side of one of the grinds along a resistance track, that ίο the inside of the plate spiraling outwards, characterized in that the intermediate web protruding from the plate surface has a small member of a ring gear (51} which - which meshes with the rack at only one point the roller wheel (58) via a driving pin which is rotatably mounted on a shaft which is connected at an angle (61) and which is guided on one side through the bearing of the roller wheel.
from the inside of the part to the outside spiral 15 The advantages achieved with the invention exist; fend, protruding from the plate surface in the fact that the roll potentiometer has a (52) which only at one point meshes with the tooth drive allowing a very fine setting and which has a shaft (55) which is rotatably mounted from a few easy-to-manufacture components, which consists of injection-molded plastic parts at an angle through the bearing
(56) of the roller wheel (58) is guided. »O The spiral-shaped web allows a reduction which, with one full revolution of the roller wheel, only moves the grinder part by one tooth spacing of the rack shifts. Therefore, such roles are suitable resistances especially for setting round »5 radio and television receivers, especially for tuning, whereby a variable tuning voltage can be tapped via the resistor The invention relates to a means of a Rollra can, which z. B. the transmitter via varactor diodes adjustable electrical resistance whose position causes. Rolling wheel via an intermediate member with one with the gear 30 The invention is explained in more detail on the basis of the toothed rack firmly connected in the drawing housing is in engagement illustrated embodiment
and in which a grinder part is articulated to the roller wheel. 1 to 3 a roll potentiometer is shown is, which by turning the roller wheel with a constellation, which has a diagonally running crown wheel 51, cycle part grinds along a resistance track. The one that runs in a spiral shape at this ring gear In such devices, especially in devices, the secondary web 52 meshes through the inclined position of the ring gear Richtentechnik, roll potentiometers used is 51 only with one side in one on the potentiometer usually A rack 54 attached to the side of the roller wheel is provided with a pinion housing 53. The crown wheel hen that runs in the rack. Even with a large one, its shaft 55 runs obliquely ßen roller wheel, the breakthrough through a pin 56 in the grinder part 57 to adjust the resistance serves, there is only one reduction, which is rotatably mounted for many 40. There is a roller wheel on this pin Applications is not sufficient, especially the rotatable bearing with its knurled exterior z. B. for reasons of space, the resistance foahn only rand 59 through a slot 60 in the potentiometer shortened can be trained. An even finer housing 53 protrudes outwards. The ring gear 51 is parallel To enable adjustment, a pin 61 is therefore often provided for the ring gear shaft, which is shown in Spindle potentiometer is used, which engages an expensive spin-45 with a breakthrough 62 in the rolling wheel 58. This Del and spindle guide require and an additional breakthrough 62 is zugechen on the ring gear 51 Need position indicators. turned end circularly and to the other end As in the book by H. J. Knab, »Overview of funnel-shaped expanded to an elongated hole. At the Kinematik / Getriebelehre ", Selbstverlag, Nuremberg, turning the scroll wheel 58 is controlled by the pin 61 1930, p. 121, Fig. 1076, a 50 can turn the ring gear. The spiral ridge 52 Rotary movement in a straight line by means of a plate engages with each full rotation of the roller wheel be reshaped. With such an arrangement and ring gear in another tooth of the toothing Although a large reduction can be achieved, rod 54 pushes the grinder part 57 each one Immediate application in a roll pot because one tooth further. On the lower part 63 of the However, the tiometer is inclined to its movement 55 Slider part 57 are two electrical with each other direction to be arranged opposite rolling wheel. Such connected sliding contacts 64 attached, wherein the Namely, arranged roller wheel requires one on a resistance track 65 and the other on appropriate wide slot in the faceplate of a contact wire 66 grinds along.