GB429082A - Improvements in electric resistances and the manufacture thereof - Google Patents

Improvements in electric resistances and the manufacture thereof

Info

Publication number
GB429082A
GB429082A GB27404/34A GB2740434A GB429082A GB 429082 A GB429082 A GB 429082A GB 27404/34 A GB27404/34 A GB 27404/34A GB 2740434 A GB2740434 A GB 2740434A GB 429082 A GB429082 A GB 429082A
Authority
GB
United Kingdom
Prior art keywords
resin
resistance
followed
insulating member
conducting material
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
Application number
GB27404/34A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB429082A publication Critical patent/GB429082A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Food-Manufacturing Devices (AREA)
  • Adjustable Resistors (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

429,082. Resistance coatings and deposits; variable resistances. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. Sept. 24, 1934, No. 27404. Convention date, Nov. 4, 1933. [Class 37] Resistance layers for variable resistances are made by coating an insulating member 1 with a dispersion comprising a hardening resin and a conducting material followed by heating after removal of the dispersion medium to harden the resin, whereupon the surface 2 is smoothly ground. The grinding operation may be followed by reheating to increase the hardness of the resistance layer. Shellac or phenol-formaldehyde condensation products are specified as hardening resins, while the conducting material is preferably carbon in the form of graphite, although other materials, such as silver oxide, may be used. The insulating member 2 may be made of a fibrous material, such as paper, impregnated with a hardening resin. The movable contact 7, which may be of spherical shape, is mounted on a flexible arm secured to an insulating disc 8 rotatable by means of a knob 10. Reference has been directed by the Comptroller to Specification 409,740.
GB27404/34A 1933-11-04 1934-09-24 Improvements in electric resistances and the manufacture thereof Expired GB429082A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL429082X 1933-11-04

Publications (1)

Publication Number Publication Date
GB429082A true GB429082A (en) 1935-05-23

Family

ID=19786134

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27404/34A Expired GB429082A (en) 1933-11-04 1934-09-24 Improvements in electric resistances and the manufacture thereof

Country Status (1)

Country Link
GB (1) GB429082A (en)

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