GB660344A - Improvements in or relating to variable resistances and inductances - Google Patents

Improvements in or relating to variable resistances and inductances

Info

Publication number
GB660344A
GB660344A GB2920549A GB2920549A GB660344A GB 660344 A GB660344 A GB 660344A GB 2920549 A GB2920549 A GB 2920549A GB 2920549 A GB2920549 A GB 2920549A GB 660344 A GB660344 A GB 660344A
Authority
GB
United Kingdom
Prior art keywords
former
contacts
ridge
rod
resistance element
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
GB2920549A
Inventor
Anthony Newton Lawson
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2920549A priority Critical patent/GB660344A/en
Publication of GB660344A publication Critical patent/GB660344A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/12—Variable inductances or transformers of the signal type discontinuously variable, e.g. tapped

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

660,344. Variable resistances. STANDARD TELEPHONES & CABLES, Ltd. Nov. 15, 1949, No. 29205/49. Class 37. [Also in Group XXXV] In a tapped induc. tance or resistance element a single rotatable helically wound coil is of such cross-sectional shape that it can make electrical contact either singly or in prearranged groups with a plurality of contacts spaced around the periphery. A former 1 has a continuous ridge 2 formed along its length and is wound with resistance wire 3. The former 1 is axially mounted between two end plates 4, 5 spaced apart by rods 6. Hollow rods 7 are fixed between the plates 4, 5 and are spaced around the former 1 as shown in Fig. 2. Each rod is provided with a longitudinal slot 8 and is enclosed by a helically wound strip of metal 9 which is fixed to a screw head 7a so as to rotate therewith. A contact member 10 consisting of a thin rod shaped as shown is secured to a cylindrical member 13, Fig; 3, which slides in the hollow rod 7 so that when the screw head 7a is turned the contact member 10 travels along the helical slot 9a. The former 1 is rotatable by means of the spindle 12 so that the ridge 2 may be brought into engagement with any of the contacts 10, each of which may be preset by rotating the corresponding screw 7a. The resistance element may be replaced by a space wound coil so as to form a variable inductance, and if more than one ridge 2 is used on the former 1, two or more contacts may be made to engage the wire simultaneously.
GB2920549A 1949-11-15 1949-11-15 Improvements in or relating to variable resistances and inductances Expired GB660344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2920549A GB660344A (en) 1949-11-15 1949-11-15 Improvements in or relating to variable resistances and inductances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2920549A GB660344A (en) 1949-11-15 1949-11-15 Improvements in or relating to variable resistances and inductances

Publications (1)

Publication Number Publication Date
GB660344A true GB660344A (en) 1951-11-07

Family

ID=10287827

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2920549A Expired GB660344A (en) 1949-11-15 1949-11-15 Improvements in or relating to variable resistances and inductances

Country Status (1)

Country Link
GB (1) GB660344A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745054A (en) * 1952-10-16 1956-05-08 Honeywell Regulator Co Electrical apparatus for measuring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745054A (en) * 1952-10-16 1956-05-08 Honeywell Regulator Co Electrical apparatus for measuring

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