US2462084A - Mounting of filaments in vacuum tubes - Google Patents

Mounting of filaments in vacuum tubes Download PDF

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Publication number
US2462084A
US2462084A US584753A US58475345A US2462084A US 2462084 A US2462084 A US 2462084A US 584753 A US584753 A US 584753A US 58475345 A US58475345 A US 58475345A US 2462084 A US2462084 A US 2462084A
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US
United States
Prior art keywords
filament
fixed
mounting
support
filaments
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
US584753A
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English (en)
Inventor
Foulkes Christopher Henry
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
Application granted granted Critical
Publication of US2462084A publication Critical patent/US2462084A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Definitions

  • the present invention relates to improved helical filaments for electric vacuum tubes or like devices and to a method of mounting them.
  • the principal object of the present invention therefore, is to overcome this difficulty by an improvement in the mounting arrangements.
  • the invention accordingly provides a helical filament for an electric vacuum or gas-filled tube or lamp, having a point at one end of the helix attached to a fixed conducting support and a point at the other end of the helix fixed to a metal conductor passing coaxially through the helix into a corresponding socket in a second fixed conducting support, the said conductor being secured inside the said socket in such a position mechanical strain.
  • the conductor is at first arranged to be held loosely in the socket, and is allowed to rotate therein until any strains are removed from the filament before being finally secured to the second support,
  • the invention also covers a filament for an electric vacuum or gas-filled tube or lamp comprising a multiple helix, the wire or wires of which are each attached'at one end of the helix to a corresponding fixed conducting support, and at the other end of the helix to a cylindrical metal rod passing coaxially through the helix into a metal sleeve fixed to a central conducting support, the said rod being secured to the said metal sleeve in such a position that the wire or wires of the filament are substantially free from mechanical strain.
  • the filament I is shown as a double helix. It is first made to the desired size and shape and is set by heating in an atmosphere of hydrogen. It is then welded or otherwise secured at 2 to the upper end of a conductin rod or wire 3 which forms the filament support, and which passes coaxially through the filament.
  • a socket for the rod 3 is formed by a sleeve or tube 4 of nickel or other suitable metal which surrounds the upper that the helical filament is substantially free from 1
  • the filament I having been fixed to the rod 3,
  • the rod or wire 3 is allowed to rotate in the sleeve 3 until it takes up a position such that the filament is substantially free from strain, and it is then firmly secured to the sleeve by spot welding at 9, for example, or in any other suitable way.
  • the rods 5, l and 8 form the lead-out conductors for the filament I, and may be connected in a suitable manner by wires ID to the terminal pins mounted on the base (not shown) of the vacuum tube in the usual way.
  • the support for the rod 3 may be arranged in other ways, such as by drilling out a suitable cavity in a metal member corresponding to the rod 5 so as to form a socket in which the rod 3 may easily rotate before it is fixed.
  • the filament I may be a single helix, in which case one end is attached to the rod 3 and the other to the rod 1, for example, the rod 8 being omitted.
  • the filament could also comprise a multiple helix havin more than two constituent single helices. In this case there would be a separate rod similar to l or 8 for the lower end of each single helix, and the upper ends of all the single helices would be attached at 2 to the rod 3.
  • a helical filament for an electric vacuum tube a fixed conducting support, a second fixed conducting support having an open ended cylindrical socket, a metal conductor passing coaxially through said helical filament and having One end engaging said cylindrical socket, one
  • a method of mounting a helical filament for an electric vacuum tube which comprises attaching a point at one end of the filament to a conductor which passes coaxially through the filament and is loosely held in a socket in a fixed conducting support, attaching another point of said filament to a corresponding fixed conducting support, allowing the said first conductor to rotate in its socket until the filament has become mechanically unstrained, and then fixing the said first conductor to the first mentioned support.
  • a helical filament for a vacuumtube rigid conducting supports rigidly at tached to said filaments at a plurality of portions therealong, one of said conducting supports being fixed in position and rigidly attached to an end portion of said filament, and a second conducting support extending coaxially with said helical filament and being rigidly attached toa second portion on said filament, a third support fixed in position with respect to said first conducting support, said second conducting support being rigidly attached to said third support and fixed in the free unstressed position of said second portion on said filament to make said filament substantially free of any mechanical stress.
  • a helical filament for a vacuum tube rigid conducting supports rigidly attaehed to said filaments at a plurality of portions thei:ealong,.one of said conducting'supports being fixed in position and rigidly attached to an end portion Of said filament, and a second conducting support extending coaxially with said helical filament and being rigidly attached to a second portion on said filament, a third support fixed in positionwith respect to said first conductingsupport, said second conducting support being rigidly attached to said third support and fixed in a relative position which substantially compensates for any mechanical stress remaining in said filament after it has been attached to said second conducting support.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Wire Processing (AREA)
US584753A 1944-06-06 1945-03-26 Mounting of filaments in vacuum tubes Expired - Lifetime US2462084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10896/44A GB582025A (en) 1944-06-06 1944-06-06 Improvements in or relating to the mounting of helical conducting filaments in electrical devices

Publications (1)

Publication Number Publication Date
US2462084A true US2462084A (en) 1949-02-22

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ID=9976310

Family Applications (1)

Application Number Title Priority Date Filing Date
US584753A Expired - Lifetime US2462084A (en) 1944-06-06 1945-03-26 Mounting of filaments in vacuum tubes

Country Status (4)

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US (1) US2462084A (is")
BE (1) BE460507A (is")
FR (1) FR939160A (is")
GB (1) GB582025A (is")

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1608535A (en) * 1921-12-30 1926-11-30 Western Electric Co Electric discharge device
US1719352A (en) * 1927-06-11 1929-07-02 Edward L Young Gin pole
US2107945A (en) * 1934-11-20 1938-02-08 Gen Electric Cathode structure
US2111546A (en) * 1934-11-23 1938-03-22 Hygrade Sylvania Corp Electric discharge tube and the like
US2400080A (en) * 1941-10-10 1946-05-14 Eitel Mccullough Inc Thermionic tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1608535A (en) * 1921-12-30 1926-11-30 Western Electric Co Electric discharge device
US1719352A (en) * 1927-06-11 1929-07-02 Edward L Young Gin pole
US2107945A (en) * 1934-11-20 1938-02-08 Gen Electric Cathode structure
US2111546A (en) * 1934-11-23 1938-03-22 Hygrade Sylvania Corp Electric discharge tube and the like
US2400080A (en) * 1941-10-10 1946-05-14 Eitel Mccullough Inc Thermionic tube

Also Published As

Publication number Publication date
GB582025A (en) 1946-11-01
BE460507A (is")
FR939160A (fr) 1948-11-05

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