US2525993A - Miniature multiple unit variable resistor - Google Patents

Miniature multiple unit variable resistor Download PDF

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US2525993A
US2525993A US53118A US5311848A US2525993A US 2525993 A US2525993 A US 2525993A US 53118 A US53118 A US 53118A US 5311848 A US5311848 A US 5311848A US 2525993 A US2525993 A US 2525993A
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knob
shaft
unit
variable resistor
units
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US53118A
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Karl W Youngbeck
Henry J Glueckstein
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Globe Union Inc
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Globe Union Inc
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C10/00Adjustable resistors
    • H01C10/16Adjustable resistors including plural resistive elements
    • H01C10/20Contact structure or movable resistive elements being ganged

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  • This invention relates to improvements in variable resistors, and particularly to miniature multiple unit variable resistors.
  • Units of this type are used for hearing aids, telephone equipment, and in other electronic circuits where smoothness of operation, compactness, and small size are required characteristics.
  • Resistors of this type may be connected for tandem or dual (independent) operation. In either case the problem is to arrange and hold together the variable resistor units without using bulky or insecure fastening means and space-consuming couplings.
  • a spacer disc which also functions as a cover plate for the open end of one of the units. This disc -is notched to accommodate the mounting brackets and permit a flush fit of the units.
  • Fig. 5 is a view partly in side elevation and and partly in cross section of a dual control miniature multiple unit variable resistor embodying the present invention
  • Fig. 6 is an enlarged sectional view taken on the line 6-6 of Fig. 5;
  • Fig. '7 is an enlarged sectional view taken on the line 1-4 of Fig. 5;
  • Fig. 8 is a perspective view of the coupling shaft by which dual control of the resistor is obtained.
  • a tandem control miniature multiple unit variable resistor generally designated ID.
  • a dual control resistor H of this multiple unittype is viewed at Fig. 5.
  • Both resistors consistof two variable resistor units having identical housings and substantially identical operating elements except for slight differences between the shafts of the front and rear unitsand between the shafts of the tandem and dual "types; As herein used, front or forward will betoward the right, and rear or back will be toward the left as viewed in Figs. 2 and 5.
  • Each'resistor unit for both dual and tandem types comprises a housing l2 having a base or rear wall with a centrally mounted shaft holding' bushing l4.
  • Each housing also includes a peripheral side wall providing an opening at the front of the housing.
  • the opening of the front unit is'normally closed by a washer type cover It and the opening of the rear unit by a spacer disc 46.
  • the construction of the resistor units is of conventional design.
  • Each includes a flat strip type resistor resting against the inner face of the base connected thereto and to the outer terminals l8 and 20 by suitable rivets.
  • a rotatable spring contact member 22 is mounted on the milled end of each of shafts 24, 24a, 26, and 26a and rotates therewith. This member has fingers which ride on the resistor strip to vary the resistance when the shafts are rotated.
  • a stop plate 28 which limits the rotation of the shafts to an angular amount of approximately two hundred and sixty degrees.
  • the spring contact member 22 and stop plate 28 may be secured in place by staking over the end of the shaft.
  • a midc'le terminal 30 riveted to the base of the housings i2 is connected by a pig-tail connector 32 to the spring contactor 22 so that the unit may be electrically connected in a desired circuit.
  • the shaft with the spring contact member and stop plate in place are inserted in the bearing 14 from the inner end and held against axial movement by a C-ring 34.
  • the shafts 24 and 26 are solid.
  • the shaft 24 has a slot 36 in its forward end substantially parallel with the milled flats while the shaft 26 has a slot 38 in its rear end substantially at ninety degrees to the milled flats.
  • These slots accommodate the flanges on coupling 40 ( Figure 4) and thus the units are connected for tandem movement.
  • Shaft 26 is somewhat longer than shaft 24 and has additional milled flats on its forward end on which control knob 42 is fixedly held by a hex screw 44. Rotation of knob 42 results in joint adjustment of both resistances of the resistor.
  • the terminals i8, 28 and 30 of the front unit project radially from the rear of the housing to bring the units close together.
  • the terminals I8, 28, and 30 for the rear unit may either project radially or axially from the rear of the housing, although the latter arrangement is more convenient when connecting wires to the terminals.
  • spacing disc 46 which may be made of plastic or other non-conductive material. spacing disc 46 seats on the edges of the opening of the rear unit and also acts. as a cover for the housing of that unit.
  • the face of the disc has recesses 48 to accommodate the terminals I8, 20, and 38 and their rivets and recesses 49 to provide room for the mounting brackets 52 and 54. It also has a central aperture to provide operating The space for the coupler 40. Around the edge of this aperture there is a recess 50 for accommodating the ridges on the rear surface of the base of the housings l2.
  • the two units are arranged and held in coaxial position by mounting brackets 52 and 54 and tie brackets 56 and 58.
  • the mounting brackets 52 and 54 project diametrically radially from the rear wall or base of the forward unit being held to the face thereof by rivets.
  • the tie brackets 56 and 58 have body portions resting fiat against and riveted to the base or rear wall of the rear unit and legs closely paralleling the sides of the rear housing and projecting forwardly into engagement with the mounting brackets 52 and 54.
  • the ends of the legs project through slots in the mounting brackets and are staked or bent over as indicated at 60 to hold the legs to the mounting brackets.
  • the legs may be secured by other means, such assoldering or welding, so long as the connection is made while the units are held tightly together.
  • each unit has an overall diameter (exclusive of the knob terminals and mounting bracket and tie brack t) of only approximately .615 to .619 inch.
  • each of 4 the units is separately operated by its own control knob so that the multiple resistor has dual rather than tandem control.
  • Each of the resistor units I2 is fastened together in the same manner as hereinbefore described for the tandem control unit.
  • the main difference resides in the provision of a bore 62 in the rear unit shaft 24a and a bore 64 in the front unit shaft 25a.
  • the shaft 26a also has an extension 66 provided with milled flats, which permit the knoblocking clip 68 to slide thereon, and a retaining groove 6?.
  • the coupling head of this shaft interlocks with the slot 72 in the forward end of shaft 24a.
  • the inner knob 14 has an oblong recess which receives the milled extension 66 to cause the shaft 26a to be rotated therewith.
  • the knob-locking clip 68 is first fitted over the extension 65 and then rotated ninety degrees to lock it in the groove 61, thus holding it against axial displacement.
  • the knob-locking clip 68 has forwardly projecting arms 16 substantially normal to the plane of its body portion which fit through slots F8 in the knob 14; the knob being held on the arms 16 by bending over an outer corner 88 of the end of said arms. It is more satisfactory, although not necessary, to notch,
  • a sloping edge 82 will engage the outer edge of the slots T8 to stress the engagement between the knob 14 and the clip 68, thus firmly seating the extension 66 in the recess of the knob.
  • a suitable cylindrical tool may be inserted in the bore 62 and the coupling shaft 10 urged forwardly by such tool so that its head is flush against the rear end of shaft 26a. While so held an outer knob 84 is fitted over the end of coupling shaft 10 and secured in place by the set screw and milled flat arrangement indicated at 85 and 88. It is preferable to place a thin shim between the knob 74 and the knob 84 during assembly which when removed will provide for suflicient clearance between these knobs.
  • a recess in the rear of knob 84 provides clearance space for the ends of legs 16.
  • variable resistor having a plurality of variable resistor units mounted in identical coaxially arranged housings, the combination laterally projecting mounting brackets secured to one of said housings, said mounting brackets having slots for receiving the ends of the brackets and means by which said resistor may be mounted to a chassis or frame with tie brackets secured to an adjacent other one of said housings, said tie brackets having legs paralleling the sides of said last mentioned housing and ends projecting through said slots and staked against said mounting brackets whereby said housings are maintained in prearranged relationship.
  • variable resistor having a plurality of variable resistor units mounted in identical coaxially arranged housings
  • a miniature multiple unit variable resistor having each unit enclosed in identical housings, the combination of laterally projecting mounting brackets secured to the base of a first housing, with a spacing disc forming a cover for an adjacent second housing and spacing said first and second housings, there being recesses in said spacing disc to accommodate said mounting brackets, and tie brackets secured to the base of the second housing and extending to and engaged with said mounting brackets.
  • an inner knob for operating the shaft of a first unit said knob being connected to the shaft of said first unit by a knob-locking clip consisting of a body mounted on the shaft between said resistor and said inner knob, said body having spaced arms projecting normally to the plane of the body, said inner knob having slots through which said arms project, said arms having a bent tip holding said knob on said arms, and an outer knob secured to the shaft of a second unit, said outer knob having a recess on its inner wall for accommodating and enclosing said bent tips.
  • a miniature multiple unit variable resistor having coaxially arranged units, bored shafts for controlling said units severally rotatably mounted in each unit, an inner knob connected to the shaft of a first unit, a coupling shaft concentrically mounted within the bore of said last-named shaft, said coupling shaft having a coupling head at its inner end consisting of a flange extending radially of said shaft to limit the axial movement thereof, and a key extending ou Wardly of said flange, anouter knob mounted on the outer end of said coupling shaft, a slot in the bored shaft of a second unit for receiving said key to provide a driving connection between said coupling shaft and said bored shaft, the bore in the shaft of the second unit having an end opening permitting the insertion of a tool through such shaft to engage and outwardly axially urge said coupling shaft during the assembly of said outer knob.

Description

1 1950 K. w. YOUNGBECK EI'AL 2,525,993
MINIATURE MULTIPLE UNIT VARIABLE RESISTOR 2 Sheets-Sheet Filed 001:. 6, 1948 IN V EN TORS m B N an. R m 0 U 7 06 T .A W w LY RR A K W 17, 1950 K. w. YOUNGBECK ETI'AL 2,525,993
MINIATURE MULTIPLE UNIT VARIABLE RESISTOR Filed Oct. 6, 1948 2 Sheets-Sheet 2 INVENTORS KARL W.Youneesc K BY HENRY J. Gwzcxsrsm ATTORNEY Patented Oct. 17, 1950 MINIATURE MULTIPLE UNIT VARIABLE RESISTOR Karl W. Youngbcck and Henry J. Glueckstein, Milwaukee, Wis., assignors to Globe-Union Inc., Milwaukee, Wis., a corporation of Delaware Application October 6, 1948, Serial No. 53,118
This invention relates to improvements in variable resistors, and particularly to miniature multiple unit variable resistors.
Units of this type are used for hearing aids, telephone equipment, and in other electronic circuits where smoothness of operation, compactness, and small size are required characteristics. Resistors of this type may be connected for tandem or dual (independent) operation. In either case the problem is to arrange and hold together the variable resistor units without using bulky or insecure fastening means and space-consuming couplings.
' It is an object of this invention, therefore, to provide a miniature multiple unit variable resistor in which the units are secured together in coaxial arrangement in such fashion that a mini-.
able resistor in which the control knobs are so arranged and secured to the control shafts of reing of an adjacent unit; and interconnecting the tie bracketswith the mounting brackets so as to hold the units as so arranged. To provide suilicient space for the inclusion of a connecting coupling between the shafts of adjacent units there is positioned between the units a spacer disc which also functions as a cover plate for the open end of one of the units. This disc -is notched to accommodate the mounting brackets and permit a flush fit of the units. When the unit is assembled for dual control, an inner control knob is secured to the shaft of the outer unit by a knob-locking clip and an outer control knob is secured to a coupling shaft which operates this inner unit. This outer knob overlies and encloses projecting portions of the spaced arms on the knob-locking clip which hold the inner knob. In this way the space required to secure the knobs the appearance of the unit enhanced.
The novel featureswhich are considered chartion, itself, however, both as to its organization 5'Claims. (Cl. 201) and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of a specific embodiment When read in connection with theaccompanying drawing, in which:
connecting the shafts of the variable resistor units;
Fig. 5 is a view partly in side elevation and and partly in cross section of a dual control miniature multiple unit variable resistor embodying the present invention;
' Fig. 6 is an enlarged sectional view taken on the line 6-6 of Fig. 5;
Fig. '7 is an enlarged sectional view taken on the line 1-4 of Fig. 5; and
Fig. 8 is a perspective view of the coupling shaft by which dual control of the resistor is obtained.
Referring to the drawings by reference nu- "merals, there is viewed in Fig. 1 a tandem control miniature multiple unit variable resistor, generally designated ID. A dual control resistor H of this multiple unittype is viewed at Fig. 5. Both resistors consistof two variable resistor units having identical housings and substantially identical operating elements except for slight differences between the shafts of the front and rear unitsand between the shafts of the tandem and dual "types; As herein used, front or forward will betoward the right, and rear or back will be toward the left as viewed in Figs. 2 and 5. Each'resistor unit for both dual and tandem types comprises a housing l2 having a base or rear wall with a centrally mounted shaft holding' bushing l4. Each housing also includes a peripheral side wall providing an opening at the front of the housing. The opening of the front unit is'normally closed by a washer type cover It and the opening of the rear unit by a spacer disc 46. The construction of the resistor units is of conventional design. Each includes a flat strip type resistor resting against the inner face of the base connected thereto and to the outer terminals l8 and 20 by suitable rivets. A rotatable spring contact member 22 is mounted on the milled end of each of shafts 24, 24a, 26, and 26a and rotates therewith. This member has fingers which ride on the resistor strip to vary the resistance when the shafts are rotated. There is also mounted on the milled end of these shafts a stop plate 28 which limits the rotation of the shafts to an angular amount of approximately two hundred and sixty degrees. The spring contact member 22 and stop plate 28 may be secured in place by staking over the end of the shaft. A midc'le terminal 30 riveted to the base of the housings i2 is connected by a pig-tail connector 32 to the spring contactor 22 so that the unit may be electrically connected in a desired circuit. The shaft with the spring contact member and stop plate in place are inserted in the bearing 14 from the inner end and held against axial movement by a C-ring 34. The shafts 24 and 26 are solid. However, the shaft 24 has a slot 36 in its forward end substantially parallel with the milled flats while the shaft 26 has a slot 38 in its rear end substantially at ninety degrees to the milled flats. These slots accommodate the flanges on coupling 40 (Figure 4) and thus the units are connected for tandem movement. Shaft 26 is somewhat longer than shaft 24 and has additional milled flats on its forward end on which control knob 42 is fixedly held by a hex screw 44. Rotation of knob 42 results in joint adjustment of both resistances of the resistor. It is necessary that the terminals i8, 28 and 30 of the front unit project radially from the rear of the housing to bring the units close together. However, the terminals I8, 28, and 30 for the rear unit may either project radially or axially from the rear of the housing, although the latter arrangement is more convenient when connecting wires to the terminals.
In order to rigidly secure and hold the rear unit to the rear of the front unit and to provide space for the coupler 49 there is inserted between the units a spacing disc 46 which may be made of plastic or other non-conductive material. spacing disc 46 seats on the edges of the opening of the rear unit and also acts. as a cover for the housing of that unit. The face of the disc has recesses 48 to accommodate the terminals I8, 20, and 38 and their rivets and recesses 49 to provide room for the mounting brackets 52 and 54. It also has a central aperture to provide operating The space for the coupler 40. Around the edge of this aperture there is a recess 50 for accommodating the ridges on the rear surface of the base of the housings l2. The two units are arranged and held in coaxial position by mounting brackets 52 and 54 and tie brackets 56 and 58. The mounting brackets 52 and 54 project diametrically radially from the rear wall or base of the forward unit being held to the face thereof by rivets. The tie brackets 56 and 58 have body portions resting fiat against and riveted to the base or rear wall of the rear unit and legs closely paralleling the sides of the rear housing and projecting forwardly into engagement with the mounting brackets 52 and 54. The ends of the legs project through slots in the mounting brackets and are staked or bent over as indicated at 60 to hold the legs to the mounting brackets. The legs may be secured by other means, such assoldering or welding, so long as the connection is made while the units are held tightly together. This manner of inter-connecting the units conserves the greatest amount of axial and diametrical space and is of considerable importance when it is considered that each unit has an overall diameter (exclusive of the knob terminals and mounting bracket and tie brack t) of only approximately .615 to .619 inch.
In the device shown in Figures 5 to 8, each of 4 the units is separately operated by its own control knob so that the multiple resistor has dual rather than tandem control. Each of the resistor units I2 is fastened together in the same manner as hereinbefore described for the tandem control unit. The main difference resides in the provision of a bore 62 in the rear unit shaft 24a and a bore 64 in the front unit shaft 25a. The shaft 26a also has an extension 66 provided with milled flats, which permit the knoblocking clip 68 to slide thereon, and a retaining groove 6?. Before the rear unit is assembled to the front unit a coupling shaft 10 (see Figure 8) is inserted through the counter bore 64 so that its coupling end is at the rear end of the shaft 26a. The coupling head of this shaft interlocks with the slot 72 in the forward end of shaft 24a. To keep the dual control unit at a minimum length it is necessary to provide a compact manner for mounting the control knobs on their respective shafts. The inner knob 14 has an oblong recess which receives the milled extension 66 to cause the shaft 26a to be rotated therewith. The knob-locking clip 68 is first fitted over the extension 65 and then rotated ninety degrees to lock it in the groove 61, thus holding it against axial displacement. The knob-locking clip 68 has forwardly projecting arms 16 substantially normal to the plane of its body portion which fit through slots F8 in the knob 14; the knob being held on the arms 16 by bending over an outer corner 88 of the end of said arms. It is more satisfactory, although not necessary, to notch,
the arms 16 near the tips so that when the corners are bent, as shown in Figure 7, a sloping edge 82 will engage the outer edge of the slots T8 to stress the engagement between the knob 14 and the clip 68, thus firmly seating the extension 66 in the recess of the knob. When the knob 14 is fastened as heretofore described, a suitable cylindrical tool may be inserted in the bore 62 and the coupling shaft 10 urged forwardly by such tool so that its head is flush against the rear end of shaft 26a. While so held an outer knob 84 is fitted over the end of coupling shaft 10 and secured in place by the set screw and milled flat arrangement indicated at 85 and 88. It is preferable to place a thin shim between the knob 74 and the knob 84 during assembly which when removed will provide for suflicient clearance between these knobs. A recess in the rear of knob 84 provides clearance space for the ends of legs 16.
Although only one embodiment of the invention is shown and described herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claims.
We claim:
l. In a variable resistor having a plurality of variable resistor units mounted in identical coaxially arranged housings, the combination laterally projecting mounting brackets secured to one of said housings, said mounting brackets having slots for receiving the ends of the brackets and means by which said resistor may be mounted to a chassis or frame with tie brackets secured to an adjacent other one of said housings, said tie brackets having legs paralleling the sides of said last mentioned housing and ends projecting through said slots and staked against said mounting brackets whereby said housings are maintained in prearranged relationship.
2. In a variable resistor having a plurality of variable resistor units mounted in identical coaxially arranged housings, the combination of laterally projecting mounting brackets secured to the base of one of said housings, said mounting brackets having means by which said resistor may be mounted to a chassis or frame, with tie brackets secured to the base of an adjacent other one of said housings, said tie brackets having longitudinally extending legs paralleling the sides of the said last mentioned housing and ends secured to said mounting brackets to maintain said housings in prearranged relationship.
3. In a miniature multiple unit variable resistor having each unit enclosed in identical housings, the combination of laterally projecting mounting brackets secured to the base of a first housing, with a spacing disc forming a cover for an adjacent second housing and spacing said first and second housings, there being recesses in said spacing disc to accommodate said mounting brackets, and tie brackets secured to the base of the second housing and extending to and engaged with said mounting brackets.
4. In a miniature multiple unit variable resistor having coaxially arranged units operated by shafts, an inner knob for operating the shaft of a first unit, said knob being connected to the shaft of said first unit by a knob-locking clip consisting of a body mounted on the shaft between said resistor and said inner knob, said body having spaced arms projecting normally to the plane of the body, said inner knob having slots through which said arms project, said arms having a bent tip holding said knob on said arms, and an outer knob secured to the shaft of a second unit, said outer knob having a recess on its inner wall for accommodating and enclosing said bent tips.
5. In a miniature multiple unit variable resistor having coaxially arranged units, bored shafts for controlling said units severally rotatably mounted in each unit, an inner knob connected to the shaft of a first unit, a coupling shaft concentrically mounted within the bore of said last-named shaft, said coupling shaft having a coupling head at its inner end consisting of a flange extending radially of said shaft to limit the axial movement thereof, and a key extending ou Wardly of said flange, anouter knob mounted on the outer end of said coupling shaft, a slot in the bored shaft of a second unit for receiving said key to provide a driving connection between said coupling shaft and said bored shaft, the bore in the shaft of the second unit having an end opening permitting the insertion of a tool through such shaft to engage and outwardly axially urge said coupling shaft during the assembly of said outer knob.
KARL W. YOUNGBECK. HENRY J. GLUECKSTEIN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,415,534 Donle May 9, 1922 1,449,725 Beckert Mar. 27, 1923 1,643,105 Wiegand Sept. 20, 1927 2,120,651 Schellenger June 14, 1938 2,172,396 Meuer Sept. 12, 1939 2,303,499 Rich Dec. 1, 1942 2401,03? Arvin May 28, 1946
US53118A 1948-10-06 1948-10-06 Miniature multiple unit variable resistor Expired - Lifetime US2525993A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883500A (en) * 1957-02-11 1959-04-21 Chicago Telephone Supply Corp Concentric tandem variable resistance control
US3187288A (en) * 1962-07-23 1965-06-01 Curtiss Wright Corp Precision potentiometer
US3200208A (en) * 1962-07-02 1965-08-10 Oak Mfg Co Rotary selector switch construction with rotor interlocking means
US3245022A (en) * 1963-04-11 1966-04-05 Globe Union Inc Ganged rotary variable resistor assembly
US3355693A (en) * 1964-07-27 1967-11-28 Cts Corp Variable resistance control
US3412360A (en) * 1965-06-23 1968-11-19 Globe Union Inc Angularly adjustable control
US9363868B1 (en) * 2014-11-18 2016-06-07 Ma Lighting Technology Gmbh Lighting control console having a dual encoder and method for operating a lighting control console having a dual encoder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1415534A (en) * 1921-12-15 1922-05-09 Connecticut Telephone & Elec Variable resistance
US1449725A (en) * 1921-10-18 1923-03-27 Gen Electric Electrical apparatus
US1643105A (en) * 1927-09-20 Mer mfg
US2120651A (en) * 1934-06-11 1938-06-14 Chicago Telephone Supply Co Variable resistance device
US2172396A (en) * 1937-05-26 1939-09-12 Cutler Hammer Inc Electric switch of the slow-make, slow-break type
US2303499A (en) * 1939-09-15 1942-12-01 Westinghouse Electric & Mfg Co Rheostat
US2401037A (en) * 1942-11-12 1946-05-28 Mallory & Co Inc P R Variable resistance device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1643105A (en) * 1927-09-20 Mer mfg
US1449725A (en) * 1921-10-18 1923-03-27 Gen Electric Electrical apparatus
US1415534A (en) * 1921-12-15 1922-05-09 Connecticut Telephone & Elec Variable resistance
US2120651A (en) * 1934-06-11 1938-06-14 Chicago Telephone Supply Co Variable resistance device
US2172396A (en) * 1937-05-26 1939-09-12 Cutler Hammer Inc Electric switch of the slow-make, slow-break type
US2303499A (en) * 1939-09-15 1942-12-01 Westinghouse Electric & Mfg Co Rheostat
US2401037A (en) * 1942-11-12 1946-05-28 Mallory & Co Inc P R Variable resistance device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883500A (en) * 1957-02-11 1959-04-21 Chicago Telephone Supply Corp Concentric tandem variable resistance control
US3200208A (en) * 1962-07-02 1965-08-10 Oak Mfg Co Rotary selector switch construction with rotor interlocking means
US3187288A (en) * 1962-07-23 1965-06-01 Curtiss Wright Corp Precision potentiometer
US3245022A (en) * 1963-04-11 1966-04-05 Globe Union Inc Ganged rotary variable resistor assembly
US3355693A (en) * 1964-07-27 1967-11-28 Cts Corp Variable resistance control
US3412360A (en) * 1965-06-23 1968-11-19 Globe Union Inc Angularly adjustable control
US9363868B1 (en) * 2014-11-18 2016-06-07 Ma Lighting Technology Gmbh Lighting control console having a dual encoder and method for operating a lighting control console having a dual encoder

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