US3551791A - Plural voltage divider aggregate - Google Patents

Plural voltage divider aggregate Download PDF

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Publication number
US3551791A
US3551791A US758828A US3551791DA US3551791A US 3551791 A US3551791 A US 3551791A US 758828 A US758828 A US 758828A US 3551791D A US3551791D A US 3551791DA US 3551791 A US3551791 A US 3551791A
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US
United States
Prior art keywords
voltage
aggregate
shaft
voltage divider
divider
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US758828A
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English (en)
Inventor
Wolfgang Labude
Karl-Heinz Bauer
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Preh GmbH
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Preh GmbH
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Filing date
Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
    • H01C10/36—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path structurally combined with switching arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/066—Constructional details regarding potentiometric setting of voltage or current variable reactances

Definitions

  • the supporting plate is rotated by a hollow shaft and can assume any one of a plurality of fixed angular positions.
  • Each voltage divider is actuated by a gear.
  • the actuating gear is fixed to an adjusting shaft which is axially displaceable, to thereby engage a voltage divider.
  • the adjusting shaft is carried within the hollow shaft.
  • the invention relates to a rotor tuning or adjusting aggregate for producing stored or memorized, selectively adjustable operating voltages for control and tuning elements, especially variable capacitance diodes, for use in communciation receivers, particularly broadcasting and television appliances.
  • spindle potentiometers on a cylinder shell as voltage storage and to bring the needed voltage storage into the catched or locked working position by rotating the cylinder.
  • spindle voltage dividers which may be rotated into the catched working position in the same manner as the cylinder aggregate.
  • the invention is directed to forming the components for switching on the required memory voltage and for the adjustment of the same in such a manner that they may be operated as simply as possible, that in a suitable manner they are subordinated to the entire design of the apparatus, and that they fulfill the requirements of shape.
  • a further object of the invention consists in rendering the construction, especially of the voltage divider system, so simple that it can be manufactured most economically by mass production methods.
  • a rotor adjusting aggregate for supplying memorized, selectively adjustable operational voltages for control and adjustment components or elements, especially variable capacitance diodes, in which the voltage memories consist of rotary layer-voltage-dividers arranged at equal angular distances on a common supporting plate and each being provided with a gear so that the supporting plate of the voltage memory is rotatable by means of a hollow shaft into the catch positions and so that the gear of the voltage divider being at that time in working position can be coupled by axial displacement to an adjustment shaft common to all voltage dividers, which is guided in the hollow shaft.
  • the corresponding operating elements are coordinated with each other, whereby the operation is simplified and facilitated.
  • the voltage once memorized cannot inadvertently be changed since the slider of the then switchedon voltage divider is adjustable only after the coupling is engaged.
  • the adjustment shaft is provided with a pinion and a conical surface, which in the uncoupled position of the shaft rests against a counter conical part of the hollow shaft, so that the adjustment shaft upon its displacement in axial direction is brought into a position parallel to the axis of the hollow shaft whereby an intermediate wheel, pivotable against spring action and meshing with its pinion, is brought into engagement position with the gear of the rotating voltage divider which is at that time in an operating or Working position with respect to certain common contacts.
  • a second embodiment of the voltage adjustment device it is proposed to provide the adjusting shaft, which is axially displaceable and which is concentrically supported in the hollow shaft, with a pinion which is engaged by a rotatably supported intermediate wheel which on its part is brought by axial displacement of the adjusting shaft against spring action into engagement position with the gear of the rotatable voltage divider then being in working position.
  • the resistance elements of the rotatable voltage dividers are applied as layer resistance surfaces and their conducting connections are applied as conductive silver strips directly on a rotary supporting disk consisting of insulating material by known methods such a spraying, printing or the like.
  • the application of all resistance layers and all conducting silver connections may be carried out in one operation, whereby the production costs are materially lowered.
  • the making of the conducting connections may also be done by known methods of producing printed circuits.
  • a lowering of the production costs of the voltage divider system is achieved in accordance with a further proposal of the invention thereby that the gear wheel of each rotatable voltage divider is die-cast as one piece with a shaft extension on both sides of a bearing bore in the supporting plate in such a manner that it is fixed in axial direction but is by shrinkage rotatable in the bearing bore with a certain breaking moment.
  • the hollow shaft is non-rotatably connected with the supporting disk by a hub of synthetic resin diecast into place. Inasmuch as this operation may be carried out simultaneously with the die-casting of the gear wheels, a further shortening of the manufacturing time of the voltage divider system is achieved.
  • the slider For applying the slider to the respective rotor voltage divider it is proposed in accordance with the present invention, to secure the same in the shaft projection of the gear wheel by means of a bolt, the slider serving in co- 3 operation with the stationary counter contact as pickoif contact.
  • the collector ring customarily employed in rotor voltage dividers, and a special step contact are hereby eliminated.
  • a hand may also be applied on the same bolt, which hand indicates in a corresponding cutout of the housing of the device the slider position of the respective rotor voltage divider then being in the working position.
  • the starting and final connections of the rotor voltage divider are formed in a first embodiment as switching contacts and are arranged so that the contacts of the rotor voltage divider then being in working position is applicable through two stationary counter contacts to the input voltage.
  • this embodiment at one time one voltage divider only is applied to voltage, resulting in a relatively small current consumption.
  • the rotor voltage divider or single groups thereof are connected in series, under given conditions with the insertion of fixed resistances, and these in-series wirings are connected over slide rings in cooperation with stationary counter contacts to the input voltage.
  • this in-series wiring each voltage divider is coordinated with one definite fixed partial range of the total voltage in the confines of which the memory voltage is adjustable.
  • rotor bolts and/ or cams are attached to the periphery of the supporting disk at equal angular distances. Such cams cooperate with a range switch provided on the aggregates housing and a predetermined receiving range can be switched on.
  • FIG. 1 shows a section along a plane extending vertically to the axis of rotation of a rotor adjustment aggregate having six voltage memories, and is a view along section D-D of FIG. 2;
  • FIG. 2 represents an axial section of this device with a pivotable intermediate wheel
  • FIG. 3 shows an axial section of another embodiment of an aggregate with an axially displaceable intermediate wheel
  • FIG. 4 shows part of the front elevation of a receiver with the adjustment aggregate of either FIG. 2 or 3;
  • FIG. 5 is a symbolic representation of the voltage divider of the embodiments of FIGS. 2 and 3;
  • FIG. 6 is a symbolic representation of an aggregate having eight voltage dividers wired parallel to each other.
  • FIG. 7 is a symbolic representation of an aggregate having two groups of voltage dividers arranged in series.
  • the adjustment devices according to FIGS. 1, 2 and 3 comprise a bushing 1, a housing 2 of the aggregate and a hollow shaft 3 of a rotor, shaft 3 being supported in bushing 1.
  • This rotor consists of a disk 4 of insulating material, including a hub 5 of synthetic material, die-cast onto the disc and shaft 3 is nonrotatably connected with hollow shaft 3.
  • Disk 4 is provided with six bores arranged at angular distances of sixty degrees from one another.
  • Six synthetic resin gear wheels 6 are die-cast onto a shaft extension 7 on both sides of the supporting disk 4 so that they are axially fixed but, on account of the shrinkage in the bearing bore, are rotatable upon overcoming a certain braking moment.
  • Annular layer resistance strips 8 are directly applied to the supporting disk 4 concentrically to the gear wheels 6 and are connected by conducting silver webs 9, 10, 11 to contact pins 12, 13.
  • the resistor 14 is applied between the conductor silver strips 9, 10 as affixed basic resistance for limiting the variation range of the voltage divider.
  • the contact bolt 15 is nonrotatably inserted in a bore of shaft extension 7 and has attached to it the resilient slide 16.
  • a contact support 17 having three resilient contacts 18, 19, 20 is secured to the outer wall of housing 2.
  • Contact pair 18, 19 cooperates with the contact pins 12, 13 of the rotor voltage divider being at a given time in working position (upper part of FIG. 1) and contact 20 is simultaneously biased against the end of contact bolt 15.
  • Catch roll 21 is secured to the housing wall by spring yoke 22, the roll sequentially entering into notches 23 of the sup porting disk 4 to thereby determine the six angular positions of the latter,
  • the adjusting shaft 24 is arranged in hollow shaft 3 of the rotor, shaft 24 being guided in a ring 25 of the hollow shaft and resting in the uncoupled (.rest) position with its conical part 26 on the counter conical part 27 of hub 5.
  • a pinion 28 is provided on the forward end of the adjustment shaft and is permanently in engagement with an intermediate wheel 30 rotatably supported on spring yoke 29.
  • the adjustment shaft 24, on which pinion 28 is secured is supported in cover plate 47 of the aggregate and concentrically by ring 25 in hollow shaft 3.
  • Shaft 50 of intermediate wheel 30* is axially displaceable in bearing bushing 48 against the force of spring 49, intermediate wheel 30 being in permanent engagement with pinion 28.
  • Hand 33 is placed by bushing 32 on bolt 15 (FIG. 2) and indicates in a window 34 of the aggregate housing 2 the respective position of the slider.
  • the aggregate is arranged in the appliance so that window 34 lies behind a scale arrangement 35 (FIG. 4) on the front wall of which channels assigned to the individual voltages are indicated whereby the then adjusted channel is shown by the hand.
  • the device should also be employable for receivers having two ranges, in which each memory or storage may be assigned to both ranges.
  • six rotary bolts 36 are inserted with a laterally die-cast on cam 37 into the periphery of supporting disk 4 (FIG. 1), the cam being pivotable by means of a screw driver in overcoming a certain braking moment in such a manner about 90" that the middle axis of the cam extends either in radial or tangential direction relative to the center of the aggregate.
  • Range selection switch 38 is arranged on housing 2 in such a manner that its contact is closed by radially extending cam and that the switchings required in the device are triggered by magnet switches or switching diodes. Consequently, depending on the position of the cam of the coordinated rotatable bolt 36, each voltage memory or storage may either be assigned to the one or to the other range.
  • the range adjustment is effected from the front side of the device through a cut-out 39 (FIG. 4) of its front wall and a passage 40 in the aggregate housing, the then adjusted range being simultaneously shown by the vertical or horizontal position of the adjustment slot and is readable on the double scale 35 of the corresponding channel. Note the symbolic representation of the slot positions at the end of each scale.
  • FIG. 5 for the example of FIGS, 1, 2 and 3
  • various embodiments are possible which for the same or similar mechanical design of the individual voltage dividers and of the means for adjusting them are adapted to the different requirements and are symbolically shown in FIGS. 6 and 7.
  • FIG. 6 shows a wiring of the voltage divider in WhlCl'l at each time all starting and final connections of the dividers are connected with one another and with a slide ring 41, 42 each, to which the input voltage through the slide contacts 43, 44 is fed.
  • This arrangement is distinguished from the first embodiment merely in that when the device is switched on, all voltage memories s1multaneously carry voltage.
  • FIG. 7 The electric arrangement of the voltage dlviders of a further embodiment is shown in FIG. 7, in which the individual voltage dividers are connected in two groups I, II of three or five memories, respectively, and are connected in series with the interposition of constant resistances 45.
  • the two groups are on their part connected in parallel and with the slide contacts 41, 42, which take the input voltage off slide contacts 43, 44.
  • a small voltage only for a predetermined channel is assigned to each memory, within which the memorized voltage is adjustable for equalizing tolerances and for subsequent tuning of the receiver.
  • the two memory groups I, II are assigned to two different receiving ranges.
  • the contact of range switch 38 is closed by the margin of switch disk 46 in the same manner as by the radially adjusted cam 37 of the first example of the range appertaining to it by subsequent, not illustrated, switching means.
  • a rotor adjusting aggregate adapted to selectively adjust voltage for control and tuning components, a plurality of voltage memories each comprising a rotor-layervoltage-divider and a gear wheel, a common supporting plate, said voltage-divider being attached to said plate at equal angular distances from each other, a stationary supporting structure, a hollow shaft secured to said plate, means on said structure adapted to support said hollow shaft and said plate rotatably about the axis of said shaft, means adapted to releasably lock said plate and shaft in a number of different positions relative to said structure, said number of positions being equal to the number of said voltage dividers, an adjusting shaft common to all voltagedividers, means adapted to guide said adjusting shaft slideably in its axial direction within said hollow shaft, a pinion secured to said adjusting shaft outside of said hollow shaft, means adapted to displace said adjusting shaft and its said pinion in axial direction and thereby to effect selectively meshing of said pinion with said gear wheel of one of said voltage-dividers.
  • Adjustment aggregate as claimed in claim 1, wherein the adjusting shaft is provided near said pinion with a portion presenting an outer conical surface and said hollow shaft with a portion presenting an inner conical surface of larger diameter than and in the same longitudinal region as said outer conical surface, spring means, adapted to keep said surfaces in contact with one another, said means which are adapted to guide said adjusting shaft slideably within said hollow shaft, being arranged at a distance in an axial direction of said shaft from said conical surfaces and being additionally adapted to permit pivotal movement of said adjusting shaft relative to said hollow shaft, said adjusting shaft being pivoted with its said pinion into engagement with one of said gear wheels upon its displacement in axial direction relative to said hollow shaft.
  • an intermediate gear wheel means adapted to support said intermediate wheel rotatably and axially displaceable relative to said voltage-divider gear and axially movable and in permanent engagement with said pinion, spring means adapted to urge said intermediate wheel into a position of disengagement with said voltage divider gear so that axial movement of said adjusting shaft and pinion with said intermediate wheel in overcoming the bias of said spring means establishes driving connection between said adjusting shaft and said voltage-divider gear.
  • Aggregrate as claimed in claim 1, adapted to be used in receivers having more than one receiving range, said aggregate having a switching disc concentrically secured to said hollow shaft and adapted to move synchronously with said supporting plate, said switching disc having an outer margin presenting circle segments of such radii as to adapt a group of voltage dividers appertaining to each one of said segements in cooperation with a range switch secured to said supporting structure to be assigned to the switch position of a predetermined receiving range.
  • Aggregrate as claimed in claim 1, adapted to be used in receivers having several receiving ranges, said aggregate having pivotable bolts secured on the periphery of said supporting plate at angular distances equalling the distances of the voltage dividers, said bolts each carrying a cam, said cams in one of their positions being adapted to coact with a range switch supported by said supporting structure so as to switch on a predetermined receiving range for the voltage-divider being in operating position.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Gear Transmission (AREA)
US758828A 1968-06-27 1968-09-10 Plural voltage divider aggregate Expired - Lifetime US3551791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681765664 DE1765664A1 (de) 1968-06-27 1968-06-27 Drehscheiben-Einstellaggregat

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4821501U (de) * 1971-07-20 1973-03-12
FR2359492A1 (fr) * 1976-07-19 1978-02-17 Electronic Components Ltd Bloc combine de potentiometre et commutateur
US4311946A (en) * 1979-03-21 1982-01-19 Lake Center Industries Actuator with electric feedback signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4821501U (de) * 1971-07-20 1973-03-12
FR2359492A1 (fr) * 1976-07-19 1978-02-17 Electronic Components Ltd Bloc combine de potentiometre et commutateur
US4311946A (en) * 1979-03-21 1982-01-19 Lake Center Industries Actuator with electric feedback signal

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Publication number Publication date
DE1765664A1 (de) 1971-09-02

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