US3551871A - Slide resistor with fine adjustment - Google Patents

Slide resistor with fine adjustment Download PDF

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Publication number
US3551871A
US3551871A US784589A US3551871DA US3551871A US 3551871 A US3551871 A US 3551871A US 784589 A US784589 A US 784589A US 3551871D A US3551871D A US 3551871DA US 3551871 A US3551871 A US 3551871A
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United States
Prior art keywords
slide
resistor
pinion
button
fine adjustment
Prior art date
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
US784589A
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English (en)
Inventor
Helmut Eberwein
Waldemar Bogsch
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Preh GmbH
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Preh GmbH
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Filing date
Publication date
Application filed by Preh GmbH filed Critical Preh GmbH
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Publication of US3551871A publication Critical patent/US3551871A/en
Anticipated expiration legal-status Critical
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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
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
    • H01C10/40—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path screw operated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means

Definitions

  • a slide resistor being roughly adjustable by slidingly moving an operating button or handle, the provision of a ne adjustment.
  • the operating button being provided in its interior with a rotatable pinion engaging a gear rack connected with the slide resistor.
  • the invention relates to a slide resistor having, in addition to a rough adjustment by slidingly moving an operating button, a fine adjustment also.
  • a slide resistor is to be used as tuning resistance for capacitance diodes of tuning devices, then a means is required for fine adjustment so as to exactly adjust the resistance in addition to its rough adjustment.
  • Such means for fine adjustment are known for rotary resistors in the form of gears.
  • Slide resistors having a separate fine adjustment device for exact tuning are however not known up to this time.
  • roll resistors in which the adjustment is carried out by a serrated wheel which is rigidly connected with a pinion rolling on a gear rack and carrying a central contact pin. This arrangement has however the drawback that the total adjustment range of the resistor requires a large number of rotations of the operation wheel for sufficient fine adjustment.
  • a object of the invention is the provision of a slide resistor offering a fine adjustment at any position of the slide resistor in addition to the rough adjustment by sliding movement of the operating button.
  • the operating means of the pinion may be supplied by the operating button itself.
  • the pinion is held either by a snap-in device in its position of rest or in its position of engagement with the gear rack.
  • FIG. l is a fragmentary, partly sectionalized side view of the slide resistor and its operating button
  • FIG. 2 shows a cross section along line 2-2 of FIG. l;
  • FIG. 3 is a view similar to FIG. 1 but of another embodiment of the invention.
  • FIG. 4 shows a cross section along line 4-4 of FIG'. 3;
  • FIG. 5 is a view similar to FIGS. 1 and 3 but of a still further embodiment.
  • FIG. 6 shows a cross section along line 6-6 of FIG. S.
  • the slide resistor shown in FIGS. 1 and 2 comprises a 3,55 1,871 Patented Dec. 29, 1970 ICC housing 1 in the interior of which are secured a resistance bar 1a and a bus bar 1b. These bars are arranged opposite each other and provided with terminals 1a and 1b. Longitudinally slidably supported in housing 1 is a slide 2 carrying a wiper spring 2a. The wiper spring 2a contacts by its opposite ends the bars la and 1b, respectively.
  • a gear rack 3 is formed on housing 1 and extends in a 1ongitudinal direction of the latter. Slide 2 is provided with two extensions 5 serving for the reception of an operating button 4.
  • button 4 Projections or noses 6 on button 4 engage recesses 7 formed near the upper ends of extensions 5 and thereby hold button 4 in its position.
  • a pinion 8 is centrally located in the interior of the operating button 4 and has a frusto-conical part 9 merging into head 10. Head 10 extends through a central opening in button 4.
  • a compression spring 13 is received in a cavity 12 of pinion 8 and biases pinion 8 so as to hold it out of engagement with gear rack 3. So as to operate the ne adjustment at any position of slide 2 along the resistor housing 1, button 10 is pushed down in bringing pinion 8 into engagement with rack 3, whereupon it is rotated so as to finely adjust the position 2 by the coaction of pinion 8 with rack 3.
  • pinion 8 is formed in one piece with a stem 9a and the combined roughand tine-adjustment button 01 handle 10a.
  • Stem 9a is received in the bore 14 of a bushing 15 which rests on a collar 16 of stem 9a.
  • a compression spring 13a is inserted between the upper end of sleeve 15 and button 10a.
  • Sleeve 15 has an outwardly projecting collar 6a at its upper end which engages the recess 7 of the extension 5 of slide 2.
  • button 10a is pushed downwardly in overcoming the force of spring 13 so as to bring pinion 8 into engagement with rack 3.
  • Rack 3 is formed as a separate element inserted into and rigidly connected with the upper wall of resistor housing 1.
  • FIGS. 5 and 6 differs from the embodiment shown in FIGS. 3 and 4 merely in the substitution of spring 13a by a U-shaped spring 18 which is held in opposite grooves 19 of bushing 15a and the arms of which are adapted to snap into circumferential grooves 17 of stern 9a.
  • spring 18 Upon engagement of spring 18 in the lower one of grooves 17, the pinion 8 is kept out of engagement with rack 3 whereas upon engagement between spring 18 and the upper one of grooves 17, pinion 8 is held in engagement with rack 3 so as to permit fine adjustment of the resistor by rotation of knob 10a.
  • This permanent engagement between pinion 8 and rack 3 is believed to be sometimes preferable to the engagement requiring for fine adjustment the maintenance of a pressure overcoming the force of spring 13 or 13a, respectively, of the embodiments shown in FIGS. 1, 2 and 3, 4, respectively.
  • a slide resistor an elongated housing, a first button connected with a slide mounted within the housing and adapted to be moved in the longitudinal direction of the housing, a contacting wiper carried by said slide conductingly bridging the space between a bus bar and an elongated resistor element, said bar and said resistor element being mounted within the housing and extending in the longitudinal direction of the slide movement, a gear rack rigidly connected with said elongated housing and extending parallel to said bus bar and said resistor element, a second button positioned within said rst button and extending to the outside thereof, said second button being rigidly connected with a pinion, said pinion being movable transversely of the said longitudinal direction of movement of said slide to thereby alternately engage and become disengaged from said gear rack, resilient means inserted between said second button and said slide and resiliently holding said second button in the position of disengagement with said rack.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
US784589A 1967-12-23 1968-12-18 Slide resistor with fine adjustment Expired - Lifetime US3551871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0043699 1967-12-23

Publications (1)

Publication Number Publication Date
US3551871A true US3551871A (en) 1970-12-29

Family

ID=7379693

Family Applications (1)

Application Number Title Priority Date Filing Date
US784589A Expired - Lifetime US3551871A (en) 1967-12-23 1968-12-18 Slide resistor with fine adjustment

Country Status (6)

Country Link
US (1) US3551871A (cs)
AT (1) AT283513B (cs)
DE (1) DE1665405A1 (cs)
FR (1) FR1597692A (cs)
GB (1) GB1201878A (cs)
NL (1) NL6816688A (cs)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603855A (en) * 1970-08-19 1971-09-07 Stackpole Carbon Co Linear motion variable resistor with bridging contact in slide
US3603854A (en) * 1970-08-09 1971-09-07 Stackpole Carbon Co Variable resistor with tilted contact
US3617979A (en) * 1970-10-05 1971-11-02 Stackpole Carbon Co Linear motion potentiometer with gears and rack
US3648215A (en) * 1971-03-08 1972-03-07 Stackpole Carbon Co Linear motion variable resistor with transverse fine adjustment
US3732521A (en) * 1971-05-03 1973-05-08 Mallory & Co Inc P R Mounting means and slideable electrical contact for linear potentiometer
US4045765A (en) * 1976-01-23 1977-08-30 Masao Imamura Sliding resistor
DE2810410A1 (de) * 1978-03-10 1979-09-13 Braun Ag Antrieb fuer ein potentiometer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603854A (en) * 1970-08-09 1971-09-07 Stackpole Carbon Co Variable resistor with tilted contact
US3603855A (en) * 1970-08-19 1971-09-07 Stackpole Carbon Co Linear motion variable resistor with bridging contact in slide
US3617979A (en) * 1970-10-05 1971-11-02 Stackpole Carbon Co Linear motion potentiometer with gears and rack
US3648215A (en) * 1971-03-08 1972-03-07 Stackpole Carbon Co Linear motion variable resistor with transverse fine adjustment
US3732521A (en) * 1971-05-03 1973-05-08 Mallory & Co Inc P R Mounting means and slideable electrical contact for linear potentiometer
US4045765A (en) * 1976-01-23 1977-08-30 Masao Imamura Sliding resistor
DE2810410A1 (de) * 1978-03-10 1979-09-13 Braun Ag Antrieb fuer ein potentiometer

Also Published As

Publication number Publication date
GB1201878A (en) 1970-08-12
FR1597692A (cs) 1970-06-29
NL6816688A (cs) 1969-06-25
AT283513B (de) 1970-08-10
DE1665405A1 (de) 1971-02-11

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