US3739468A - Method of making a variable resistor - Google Patents

Method of making a variable resistor Download PDF

Info

Publication number
US3739468A
US3739468A US00221628A US3739468DA US3739468A US 3739468 A US3739468 A US 3739468A US 00221628 A US00221628 A US 00221628A US 3739468D A US3739468D A US 3739468DA US 3739468 A US3739468 A US 3739468A
Authority
US
United States
Prior art keywords
housing
adjustment
housing member
head
adjustment screw
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
US00221628A
Other languages
English (en)
Inventor
R Hill
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.)
Spectrol Electronics Corp
Original Assignee
Spectrol Electronics 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 Spectrol Electronics Corp filed Critical Spectrol Electronics Corp
Application granted granted Critical
Publication of US3739468A publication Critical patent/US3739468A/en
Assigned to HAMILTON STANDARD CONTROLS, INC., A CORP. OF DE reassignment HAMILTON STANDARD CONTROLS, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPECTROL ELECTRONICS CORPORATION
Assigned to SE ACQUISITION CORP., A CORP. OF DE. reassignment SE ACQUISITION CORP., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAMILTON STANDARD CONTROLS, INC., A CORP. OF DE.
Assigned to SPECTROL ELECTRONICS CORPORATION reassignment SPECTROL ELECTRONICS CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 1/29/90 DE Assignors: SE ACQUISITION CORP,
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
    • 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
    • H01C10/42—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path screw operated the contact bridging and sliding along resistive element and parallel conducting bar or collector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/046—Vibration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/4984—Retaining clearance for motion between assembled parts
    • Y10T29/49845—Retaining clearance for motion between assembled parts by deforming interlock

Definitions

  • ABSTRACT A variable resistor having a lead screw is provided with front and rear journals for the lead screw which are simultaneously formed by ultrasonically vibrating the lead screw and forcing a conical tip thereof to penetrate the rear wall of the resistor housing while the head of the lead screw is forming a front journal.
  • a fixture is inserted in the housing to hold the lead screw in accurately aligned position while the journals are formed. Thereafter the housing is ultrasonically deformed to hold the resistance carrying substrate assembled with the housing and a potting agent is used to seal the substrate to the housing.
  • trimmer potentiometers are usually relatively inexpensive.
  • trimmer otentiometers can be inexpensively made which approach precision performance specifications. It, therefore, becomes increasingly important to simplify the mechanical design of the trimmer to reduce manufacturing costs without, however, reducing the exacting tolerances required for a precision product.
  • a housingmember for a variable resistor is formed with front and rear thermoplastic end walls spacedapart by a side wall.
  • a cylindrical aperture is formed in the front end wall of the housing.
  • An adjustment member such as a lead screw, having an annular rib on its head, is inserted from the exterior of the housing memher through the cylindrical aperture in the front end wall.
  • a fixture is inserted into the housing to accurately position the lead screw therein.
  • the lead screw is then ultrasonically vibrated and forced further into the housing member until its rear end penetrates the rear end wall of the housing to form a rear journal. Simultaneously, the rib on the head of the lead screw penetrates further into the cylindrical aperture in the front wall of the housing to form a front journal which is accurately aligned in the desired location with respect to the rear journal.
  • FIG. 1 illustrates a longitudinal cross-section through a completed variable resistor made in accordance with this invention
  • FIG. 2 illustrates a cross-section through the variable resistor illustrating the method of inserting the lead screw member into the housing member
  • FIG. 3 is a cross-sectional view taken on line 3-3 of FIG. 2;
  • FIG. 4 is a cross-sectional view illustrating the further assembly step of securing the substrate member with the housing member.
  • FIG. 1 illustrates a completed variable resistor 10 of the type commonly referred to as a trimmer potentiometer.
  • a five'sided hollow housing member 11 is assembled with a lead screw type adjustment member 12, a substrate member 13 and a wiper member 14 as illustrated in the drawing.
  • a pot ting agent 15 such as epoxy resin
  • terminals l6, l7 and 18 project from the exterior of the variable resistor for making electrical connection with the ends of the resistance element and the wiper member.
  • Housing 11 is made of a thermoplastic material and housing member 11 is preferably molded with a longitudinally extending concave groove 36 facing the interior of the housing which assists in accurately aligning the lead screw in the housing during assembly thereof.
  • Lead screw 12 is formed of metal and has a head 30, a threaded shank 31 and a conically pointed tip 32 on the rear end thereof.
  • a circular cross-section portion, such as one or more annular ribs 33, is formed on the head end of the lead screw and preferably has an outer diameter greater than the inner diameter of cylindrical aperture 23 in the front wall of housing member 11.
  • Housing fixture 40 has end walls 41 and 42 which form a cavity 43 to hold the housing member from motion in either directionL'
  • the housing fixture is also provided with a pair of alignment pins .44 and 45 to hold a second fixture 50 in accurately ing member and accurately aligned with the housing fixture member by means of pins 44, 45.
  • Fixture 50 is formed with a concave groove 53 which rests on top of the threaded shank 31 of lead screw member 12 and forces the lead screw to rest in the bottom of concave groove 36 of the housing member.
  • An ultrasonically vibratable tool 60 is then brought into engagement with head 30 of the lead screw member and axial force is applied between tool 60 and housing fixture 40 to force the lead screw member further into the housing member.
  • the ultrasonic vibration of the lead screw causes the thermoplastic material of end wall 21 on housing member 11 to soften and flow about the region of conically pointed tip 32 on the lead screw.
  • the ultrasonic vibration of ribs 33 causes the thermoplastic material of end wall 20 on the housing member to soften and flow about annular ribs 33 on the head of the lead screw.
  • the thermoplastic material of the end walls of the housing hardens and a front and rear journal is formed for the lead screw. Since the lead screw is accurately positioned with respect to the housing by the housing fixture and the lead screw fixture, precise alignment of the lead screw in the housing is achieved without the necessity of employing hand assembled parts to form the journals.
  • fixture S is withdrawn from housing member 11 and wiper member 14 is positioned within the housing.
  • Substrate member 13 is then assembled over the open end of the housing member so that it rests on shoulders 61 and 62 thereof.
  • Substrate member 13 substantially closes the open side of housing member 11.
  • a second ultrasonic tool 65 is then brought into engagement with portions of the side walls of housing member 11 to deform a portion of the side wall into engagement with the exterior surface 66 of the substrate member as shown in FIG. 4. This operation is performed at a plurality of locations such as 68 to temporarily secure the substrate member to the housing member.
  • Housing member 11 having substrate member 13 secured thereto, is then removed from housing fixture 40 and a layer of a potting agent 15-such as epoxy resin is flowed over the exterior surface 66 of the substrate member and cured so that it solidifies to form a tight seal between the substrate member and the housing member.
  • a potting agent 15- such as epoxy resin
  • trimmer potentiometer having a linearly movable wiper member
  • principles of this invention may also be applied to other types of variable resistors.
  • trimmer potentiometer utilizes a worm gear driven by a threaded adjustment member which can be journaled in its associated housing in a manner similar to that described herein.
  • This invention enables a variable resistor to be manufactured inexpensively because of the simple journal construction. Furthermore, this invention enables an accurately aligned adjustment member to be formed with a rear journal which is free from wobbling or stresses and which has a very smooth rotational action. These factors contribute to a relatively high degree of setability with freedom from backlash and electrical noise due to wobbling of the adjustment shaft which are often associated with other types of journals. This invention, therefore, enables an inexpensive construction to be manufactured which approaches precision standards of performance.
  • a variable resistor having a housing member formed with a pair of spaced end walls connected to a side wall, one of said end walls having a cylindrical aperture formed therein, and a metal, adjustment member formed with a circular crosssection head, a threaded shank and a circular crosssection tip on the end opposite the head thereof, the steps including:
  • thermoplastic housing material discontinuing the ultrasonic vibration and allow ing the thermoplastic housing material to solidify about the region of the head and about the tip of the adjustment member whereby a front and a rear journal are simultaneously formed to rotatably support the adjustment member in the desired position in the housing member;
  • a method of forming a variable resistor as defined in claim 1' including the step of forming a concave groove in said side wall of the housing member for as sisting in locating the adjustment member in the desired position relative thereto.
  • a variable resistor having a hollow housing member with an open side formed by a pair of spaced end walls connected by three side walls, one of said end walls having a cylindrical apcr ture formed therein; a metal adjustment screw member formed with a head having at least one annular rib therein of a diameter greater than the diameter of the cylindrical aperture formed in said one end wall of the housing member, said adjustment screw member also having a threaded shank and having a conically pointed tip on the end opposite the head thereof; and a substrate member carrying an electrical resistance element, the steps including:
  • a method of making a variable resistor as defined in claim 3 wherein the step of securing the substrate member to the housing member includes ultrasonically deforming a portion of the housing member into engagement with the exterior surface of the substrate member lying outwardly of the interior cavity in the housing member, and thereafter sealing the substrate member with the housing member by flowing and solidifying a potting agent over said exterior surface of the substrate member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
US00221628A 1972-01-28 1972-01-28 Method of making a variable resistor Expired - Lifetime US3739468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22162872A 1972-01-28 1972-01-28

Publications (1)

Publication Number Publication Date
US3739468A true US3739468A (en) 1973-06-19

Family

ID=22828610

Family Applications (1)

Application Number Title Priority Date Filing Date
US00221628A Expired - Lifetime US3739468A (en) 1972-01-28 1972-01-28 Method of making a variable resistor

Country Status (5)

Country Link
US (1) US3739468A (enrdf_load_stackoverflow)
DE (1) DE2304199C3 (enrdf_load_stackoverflow)
FR (1) FR2169146B1 (enrdf_load_stackoverflow)
GB (1) GB1406855A (enrdf_load_stackoverflow)
IT (1) IT968889B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003665A (en) * 1974-03-28 1977-01-18 Kern & Co. Ag Method for the manufacture of writing instruments
US4173006A (en) * 1978-03-13 1979-10-30 Cts Corporation Variable resistance control
US4248356A (en) * 1978-01-09 1981-02-03 Aci Technical Centre Pty. Ltd. Sealing method
US4492018A (en) * 1982-08-13 1985-01-08 Temper-Ring Equipment Corporation Method of axially positioning a rotating annular member supporting shaft within a support
US5374788A (en) * 1992-10-09 1994-12-20 International Business Machines Corporation Printed wiring board and manufacturing method therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL171392C (nl) * 1977-03-08 1983-03-16 Philips Nv Variabele condensator.
DE2850835C3 (de) 1978-11-24 1981-11-19 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Einstellbares elektromechanisches Bauelement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870303A (en) * 1956-12-03 1959-01-20 Bourns Lab Inc Variable resistor
US3184353A (en) * 1961-11-13 1965-05-18 Cavitron Ultrasonics Inc Fastening together of members by high frequency vibrations
US3214720A (en) * 1962-05-18 1965-10-26 John G Ruckelshaus Multi-turn potentiometer
US3343730A (en) * 1965-05-12 1967-09-26 Nirona Werke Kg Pressurized container, more particularly spray can
US3440117A (en) * 1965-07-02 1969-04-22 Branson Instr Method of simultaneously securing a plurality of elements to a thermoplastic member using sonic energy
US3581388A (en) * 1966-11-04 1971-06-01 Dale Electronics Method of assembling a potentiometer
US3641664A (en) * 1969-10-22 1972-02-15 William D Kirkendall Method for manufacturing electrical devices

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870303A (en) * 1956-12-03 1959-01-20 Bourns Lab Inc Variable resistor
US3184353A (en) * 1961-11-13 1965-05-18 Cavitron Ultrasonics Inc Fastening together of members by high frequency vibrations
US3214720A (en) * 1962-05-18 1965-10-26 John G Ruckelshaus Multi-turn potentiometer
US3343730A (en) * 1965-05-12 1967-09-26 Nirona Werke Kg Pressurized container, more particularly spray can
US3440117A (en) * 1965-07-02 1969-04-22 Branson Instr Method of simultaneously securing a plurality of elements to a thermoplastic member using sonic energy
US3581388A (en) * 1966-11-04 1971-06-01 Dale Electronics Method of assembling a potentiometer
US3641664A (en) * 1969-10-22 1972-02-15 William D Kirkendall Method for manufacturing electrical devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003665A (en) * 1974-03-28 1977-01-18 Kern & Co. Ag Method for the manufacture of writing instruments
US4248356A (en) * 1978-01-09 1981-02-03 Aci Technical Centre Pty. Ltd. Sealing method
US4173006A (en) * 1978-03-13 1979-10-30 Cts Corporation Variable resistance control
US4492018A (en) * 1982-08-13 1985-01-08 Temper-Ring Equipment Corporation Method of axially positioning a rotating annular member supporting shaft within a support
US5374788A (en) * 1992-10-09 1994-12-20 International Business Machines Corporation Printed wiring board and manufacturing method therefor

Also Published As

Publication number Publication date
IT968889B (it) 1974-03-20
FR2169146B1 (enrdf_load_stackoverflow) 1977-09-02
DE2304199B2 (de) 1975-04-10
GB1406855A (en) 1975-09-17
DE2304199A1 (de) 1973-08-02
FR2169146A1 (enrdf_load_stackoverflow) 1973-09-07
DE2304199C3 (de) 1975-11-27

Similar Documents

Publication Publication Date Title
US5200662A (en) Joint structure of radial type rotor and output shaft in synchronous motor
US3739468A (en) Method of making a variable resistor
US3094376A (en) Method of construction of low friction elements
US5089736A (en) Automatic end play adjustment of motor armature assembly
DE102013202583B3 (de) Reibschweißelement, Gehäuse und Verbindungsverfahren für das Reibschweißelement mit einem Gehäuse
DE19743541C2 (de) Magnetfeldsensor
EP0112961B1 (de) Verfahren zur Herstellung eines Wellendichtringes
US3696318A (en) Trimmer potentiometers
DE102015213753A1 (de) Verfahren zur Herstellung eines Kraftfahrzeug-Stellantriebs
JP2004513837A (ja) 特に自動車のためのウィンドガラスワイパ装置および該ウィンドガラスワイパ装置を製造するための方法
US7024957B2 (en) Lead screw for linear actuator, and method of manufacturing the same
US3597837A (en) Method of making trimmer potentiometers
JPH0517198U (ja) 不等ピツチ円筒形羽根車の構成部材
US3641664A (en) Method for manufacturing electrical devices
EP3996963A1 (de) Sensoranordnung und verfahren zum fügen einer solchen sensoranordnung
JP2929855B2 (ja) 軸の抜け止め構造の形成方法及びそれにより形成した軸の抜け止め構造を有する電子部品
EP3276309B1 (de) Winkelsensor zum erfassen eines drehwinkels
DE102015017141A1 (de) Verfahren zur Herstellung eines Kraftfahrzeug-Stellantriebs
EP3604842A1 (de) Verfahren zur herstellung einer rotoreinheit
JP3280902B2 (ja) ステータ用磁石材料の貼付け装置
DE3405299A1 (de) Antriebsvorrichtung, insbesondere fuer scheibenwischer an kraftfahrzeugen
JPS5826549A (ja) モ−タの回転子製造方法
WO2021004670A1 (de) Messvorrichtung für eine sensoranordnung zur berührungslosen erfassung einer bewegung eines körpers
JPH0542953U (ja) 風向羽根の取付構造
DE3526948A1 (de) Gehaeuseglocke fuer einen elektrokleinmotor

Legal Events

Date Code Title Description
AS Assignment

Owner name: HAMILTON STANDARD CONTROLS, INC., A CORP. OF DE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPECTROL ELECTRONICS CORPORATION;REEL/FRAME:005254/0061

Effective date: 19830622

AS Assignment

Owner name: SE ACQUISITION CORP., A CORP. OF DE., DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HAMILTON STANDARD CONTROLS, INC., A CORP. OF DE.;REEL/FRAME:005268/0490

Effective date: 19891222

AS Assignment

Owner name: SPECTROL ELECTRONICS CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SE ACQUISITION CORP,;REEL/FRAME:005328/0356

Effective date: 19900115