US3639879A - Potentiometer comprising a transport screw - Google Patents

Potentiometer comprising a transport screw Download PDF

Info

Publication number
US3639879A
US3639879A US66652A US3639879DA US3639879A US 3639879 A US3639879 A US 3639879A US 66652 A US66652 A US 66652A US 3639879D A US3639879D A US 3639879DA US 3639879 A US3639879 A US 3639879A
Authority
US
United States
Prior art keywords
spindle
spring
contact
slide
sledge
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
US66652A
Other languages
English (en)
Inventor
Jan Van Rooijen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3639879A publication Critical patent/US3639879A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • the invention relates to a potentiometer with a contact member adapted to be displaced linearly by means of a transport screw spindle in a trough-shaped casing, and comprising a contact spring, a portion of which operates as a nut and as a contact and a further portion of which forms a sliding contact displaceable along a resistance track.
  • An object of the invention is to provide a potentiometer of this kind of very slender structure, which is important when a plurality of potentiometers have to be arranged side by side in one row, for example, in a television tuning device comprising pushbuttons and capacitance diodes.
  • the device according to the invention is characterized in that the contact member is located between the spindle and the bottom of the trough and comprises an elongated sledge or slide extending parallel to the transport spindle and having a gutter-shaped or grooved profile slidably fitting on the spindle.
  • the slide is laterally guided by the inner walls of the trough so as to prevent rotation and is urged against the spindle by the contact spring.
  • This spring has the shape of a metal wire U- shape bent to the closed end portion of the U being slightly bent over and passed through a fitting transverse slot near one end of the sledge, the web portion of said end portion engaging the screw thread of the spindle, while the limbs of the U- shaped spring have a further bent portion projecting from the slide and contacting a resistance track on the bottom of the trough, whereas the distal ends of the limbs of the contact spring engage the surface of the sledge facing the resistance track.
  • FIGS. 1 and 2 are a longitudinal and a cross-sectional view respectively
  • FIGS. 3, 4 and 5 are a bottom view, a longitudinal and a cross-sectional view respectively of a part of the device shown in FIGS. 1 and 2 and FIG. 6 shows a further part in a perspective view.
  • the potentiometer shown in FIGS. 1 and 2 comprises a trough-shaped insulating casing 1 of a synthetic resin, in which a transport screw spindle 3, which may be provided at one end with a driving gear wheel 5, is rotatably arranged.
  • the screw spindle 3 has a screw thread with teeth cut off as viewed in an axial section and is journaled at one end, here the left-hand end, in the left-hand end wall of the trough-shaped casing 1; the other end is journaled by means of an L-shaped metal bracket 7, which establishes in addition, together with a known U-shaped contact spring 9 the electric connection to a contact pin 11 in the bottom of the trough 1.
  • the trough 1 may be closed by a lid 13.
  • the transport screw spindle 3 serves for the linear displacement of a contact member comprising a contact pring 15 (see FIG. 6) having roughly the shape of a metal wire folded to U- shape, for example, of phosphor bronze.
  • the closed end containing the web 17, of the U-shaped contact spring is bent over with respect to the further spring portion over an obtuse angle in the manner illustrated in FIG. 6 and is inserted into a transverse slot 19 in an elongated, parallelopiped-shaped sledge or slide 21 of a synthetic resin, for example nylon.
  • the slide is shown separately on a slightly enlarged scale in FIGS. 3, 4 and 5, which sledge forms together with the contact spring 15 the complete displaceable contact member.
  • the web 17 of the contact spring 15 is through the slot 19 in electrical and in mechanical contact with the screw spindle 3, whereas another spring portion projects from the contours of the slide 21 and has a further bend 23. This further portion is resiliently urged into contacting engagement with a resistance track on the bottom of the trough l, for example a carbon track 25.
  • the free distal ends 27 of the legs of the contact spring 15, as is shown in FIG. 6, are slightly rounded and engage under spring pressure the surface of the sledge 21 facing the resistance track so that the slide-which is located between the spindle 3 and the resistance track 25is urged against the spindle.
  • the web member 17 at the closed end of the spring 15 operates as a nut"; as stated above, said web engages the screw thread of the spindle 3 through the fitting slot 19 of the slide 21 under spring pressure.
  • the slide 21 is guided during the movement by the spindle 3 and, in addition, by the inner walls of the trough l, the distance between which corresponds with the width of the slide so as to prevent rotation thereof. This is desirable because any rotation of the slide along with the spindle 3 would give rise to a retarded reaction (backlast) of the transport movement.
  • two ledges 29 are formed in the manner shown in FIG. 2 in the sidewalls of the trough 1 so that the slide 21 is prevented from disengaging itself from the spindle 3 and from touching the resistance track 25 in case the force of the spring ends 27 would be insufficient to prevent such disengagement.
  • a potentiometer comprising,
  • a casing having a trough-shaped inner space defined by walls and a resistance track
  • a linearly displaceable contact member comprising an electrically nonconductive slide having (i) a groove part disposed against the spindle and (ii) at least one side portion engaging one casing wall to prevent rotation of the slide, and
  • a contact spring having a first portion engaging the spindle screw thread and operable as a nut, a second portion engaging the slide to move same axially with respect to the spindle, and a third part resiliently engaging the resistance track.
  • a device according to claim 1 wherein the spring is a wire formed in a U-shape whose end portion engages the slide and said screw thread, and whose limbs contact the resistance track.
  • a device according to claim 3 wherein the slide includes two longitudinal slots which are engaged by limbs of said spring.
  • a potentiometer comprising a contact member adapted to be displaced linearly by means of a transport screw spindle in a trough-shaped casing, and comprising a contact spring having a portion engaging the screw thread of the spindle and operating as a nut and as a contact and whose second portion forms a sliding contact adapted to move along a resistance track, characterized in that the contact member is located between the spindle and the bottom of the trough and comprises an elongated sledge extending parallel to the transport spindle having a gutter-shaped profile slidingly fitting to the spindle, said sledge being laterally guided by the inner walls of the trough so as to prevent rotation and being urged by the contact spring against the spindle, said contact spring having the form of a metal wire bent to the shape of a U whose closed end portion is slightly bent over and is taken through a fitting transverse slot near one end of the sledge, the web portion of said end portion engaging the screwhead of the spindle, whereas the limb

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Transmission Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
US66652A 1968-06-11 1970-08-24 Potentiometer comprising a transport screw Expired - Lifetime US3639879A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686808170A NL141684B (nl) 1968-06-11 1968-06-11 Potentiometer met transportschroef.

Publications (1)

Publication Number Publication Date
US3639879A true US3639879A (en) 1972-02-01

Family

ID=19803869

Family Applications (1)

Application Number Title Priority Date Filing Date
US66652A Expired - Lifetime US3639879A (en) 1968-06-11 1970-08-24 Potentiometer comprising a transport screw

Country Status (5)

Country Link
US (1) US3639879A (de)
DE (2) DE1926199C3 (de)
FR (1) FR2010679A1 (de)
GB (1) GB1211069A (de)
NL (1) NL141684B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815076A (en) * 1972-05-19 1974-06-04 Alps Electric Co Ltd Rotary driven variable resistor
US3900818A (en) * 1971-01-29 1975-08-19 Philips Corp Non hermetic sealed linear trimming potentiometer
US3918023A (en) * 1973-11-05 1975-11-04 Cts Corp Variable resistance control and method of assemblying the same
US3938070A (en) * 1973-08-25 1976-02-10 Wilhelm Ruf Kg Trimming potentiometer in T or Pi network connection with parallel resistance paths
US3987389A (en) * 1973-12-27 1976-10-19 Matsushita Electric Industrial Co., Ltd. Variable resistor device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673540A (en) * 1971-01-26 1972-06-27 Philco Ford Corp Indicating device for tuning apparatus
JPS5241562Y2 (de) * 1972-10-04 1977-09-20

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107336A (en) * 1959-04-29 1963-10-15 Bourns Inc Variable resistor
US3124779A (en) * 1964-03-10 Potentiometers
US3237141A (en) * 1963-08-26 1966-02-22 Marlan E Bourns Variable resistor construction
US3365691A (en) * 1966-11-29 1968-01-23 Bourns Inc Potentiometer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124779A (en) * 1964-03-10 Potentiometers
US3107336A (en) * 1959-04-29 1963-10-15 Bourns Inc Variable resistor
US3237141A (en) * 1963-08-26 1966-02-22 Marlan E Bourns Variable resistor construction
US3365691A (en) * 1966-11-29 1968-01-23 Bourns Inc Potentiometer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900818A (en) * 1971-01-29 1975-08-19 Philips Corp Non hermetic sealed linear trimming potentiometer
US3815076A (en) * 1972-05-19 1974-06-04 Alps Electric Co Ltd Rotary driven variable resistor
US3938070A (en) * 1973-08-25 1976-02-10 Wilhelm Ruf Kg Trimming potentiometer in T or Pi network connection with parallel resistance paths
US3918023A (en) * 1973-11-05 1975-11-04 Cts Corp Variable resistance control and method of assemblying the same
US3987389A (en) * 1973-12-27 1976-10-19 Matsushita Electric Industrial Co., Ltd. Variable resistor device

Also Published As

Publication number Publication date
DE1926199A1 (de) 1969-12-18
GB1211069A (en) 1970-11-04
NL6808170A (de) 1969-12-15
DE1926199B2 (de) 1973-08-16
NL141684B (nl) 1974-03-15
FR2010679A1 (de) 1970-02-20
DE6920682U (de) 1971-09-09
DE1926199C3 (de) 1974-03-07

Similar Documents

Publication Publication Date Title
US3982807A (en) Zero force printed circuit board connector
US3319216A (en) Connector for flat cables
KR0139588B1 (ko) 분로된 콘넥터어셈블리 및 그를 위한 분로어셈블리
US3967148A (en) Brush holder assembly
US3808582A (en) Pre-loaded electrical connecting device
US3362004A (en) Straight potentiometer with linear motion contact
US3022481A (en) Electrical connector
US4021091A (en) Zero force printed circuit board connector
US3639879A (en) Potentiometer comprising a transport screw
US3699495A (en) Electrical connector for vehicle instruments
GB2301953A (en) Electrical connectors
JP3424150B2 (ja) 電気コネクタ
EP0650218A2 (de) Klemmverbinder
US4029385A (en) Electrical connector and means of mounting same
US3283289A (en) Terminal clip
US3601751A (en) Printed circuit board connector
US4315663A (en) Multiple position brush connector
US4445742A (en) Electrical cable connector
US3412361A (en) Variable resistance control
US3742421A (en) Potentiometer having a transport screw and diamond shaped contact spring
US3421136A (en) Electrical contact and edge connector having such a contact
US3588779A (en) Linear motion variable resistance control
US3732521A (en) Mounting means and slideable electrical contact for linear potentiometer
US4047146A (en) Variable resistor assembly
US7112088B2 (en) Connector for flexible printed circuit