GB693406A - Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like - Google Patents

Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like

Info

Publication number
GB693406A
GB693406A GB1767451A GB1767451A GB693406A GB 693406 A GB693406 A GB 693406A GB 1767451 A GB1767451 A GB 1767451A GB 1767451 A GB1767451 A GB 1767451A GB 693406 A GB693406 A GB 693406A
Authority
GB
United Kingdom
Prior art keywords
contact
conductor
brush
improving
turns
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
GB1767451A
Inventor
Gilbert Smiley
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.)
General Radio Co
Original Assignee
General Radio Co
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
Priority to US221878A priority Critical patent/US2949592A/en
Application filed by General Radio Co filed Critical General Radio Co
Priority to GB1767451A priority patent/GB693406A/en
Publication of GB693406A publication Critical patent/GB693406A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding

Abstract

693,406. Transformers and inductances. GENERAL RADIO CO. July 25, 1951, No. 17674/51. Class 38 (ii). [Also in Group XXXVI] An electrical apparatus-such as a variable ratio electric transformer-having a conductor 1 arranged in a plurality of turns and a brush 4 slidable across the turns in engagement with a contact track 7 formed thereon, is characterized by the fact that the conductor is provided at longitudinally-spaced intervals with contact patches 5 formed by coating the conductor with a metal selected from the group comprising gold, platinum, palladium, rhodium, silver and nickel, the patches together forming the contact track engaged by the brush. The use of noble metals for the contact track obviates tarnishing thereof in corrosive atmospheres and thus providing a constant contact resistance, which resistance may be predetermined by the selection of the noble metal and the brush material. Graphs showing contact resistance against periods of use for the metals enumerated above are included in the Specification. Specification 439,567 is referred to.
GB1767451A 1951-04-19 1951-07-25 Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like Expired GB693406A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US221878A US2949592A (en) 1951-04-19 1951-04-19 Adjustable transformer with stabilized contact track
GB1767451A GB693406A (en) 1951-07-25 1951-07-25 Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1767451A GB693406A (en) 1951-07-25 1951-07-25 Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like

Publications (1)

Publication Number Publication Date
GB693406A true GB693406A (en) 1953-07-01

Family

ID=10099217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1767451A Expired GB693406A (en) 1951-04-19 1951-07-25 Method of and apparatus for improving the contact stability of continuously adjustable electric transformers and the like

Country Status (1)

Country Link
GB (1) GB693406A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1289915B (en) * 1964-01-03 1969-02-27 Tech Physikalische Werkstaette Variable transformer with toroidal core in cast resin cast execution and process for its production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1289915B (en) * 1964-01-03 1969-02-27 Tech Physikalische Werkstaette Variable transformer with toroidal core in cast resin cast execution and process for its production

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