GB895799A - Internally-threaded glass helix - Google Patents

Internally-threaded glass helix

Info

Publication number
GB895799A
GB895799A GB4427560A GB4427560A GB895799A GB 895799 A GB895799 A GB 895799A GB 4427560 A GB4427560 A GB 4427560A GB 4427560 A GB4427560 A GB 4427560A GB 895799 A GB895799 A GB 895799A
Authority
GB
United Kingdom
Prior art keywords
helix
mandrel
glass
wire
tape
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
GB4427560A
Inventor
Sidney Joseph Eden
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB4427560A priority Critical patent/GB895799A/en
Publication of GB895799A publication Critical patent/GB895799A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/06—Re-forming tubes or rods by bending

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microwave Tubes (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

895,799. Glass helix manufacture. MULLARD Ltd. Dec. 23, 1960, No. 44275/60. Class 56. [Also in Group XL (a)] An internally threaded glass helix for a travelling wave tube is formed by winding a threaddetermining metal wire helix on to a cylindrical mandrel, winding a helix of hot soft glass on to the mandrel over the wire helix so that the wire becomes partly embedded in the glass helix, cooling the assembly to harden the glass and separating the glass helix from the mandrel and the wire helix. Before removal from the mandrel, the cooled glass helix may be precision ground to define a cylindrical outer surface. As shown in Fig. 2, a helix 2 of metal wire is wound on a mandrel 1 with further wire helices 3, 4 between so that the surface of the mandrel is substantially covered. The wire helices 3, 4 may be replaced by a tape of metal. The mandrel 1 is then placed in a glass lathe and hot soft glass is wound on to the mandrel to give a helix 5 in which the wire 2 is partly embedded, the wires 3, 4 or the tape preventing the hot glass coming into contact with the mandrel 1. After cooling and grinding, if desired, the mandrel 1 is removed and the wires 2, 3, 4 and/or the tape are dissolved out by a suitable acid to give threads 6 on the inner surface of the glass helix 5. As shown in Fig. 4, a cylindrical mandrel 8 is provided with helical groove 9 in which the helical wire is positioned, the mandrel and wire being dissolved out together after formation of the glass helix 5. A plurality of thread-producing wires 2 may be used to give a multi-start thread. The wires 2, 3, 4 and tape are preferably made of tungsten or molybdenum or an alloy with substantial proportion of either or both metals. The mandrel 8 is preferably of a nickel-chromium alloy having a coefficient of thermal expansion substantially the same as that of the glass used in the helix. The helix may be used in a travelling wave tube to support a helical longitudinally-extending slow-wave structure.
GB4427560A 1960-12-23 1960-12-23 Internally-threaded glass helix Expired GB895799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4427560A GB895799A (en) 1960-12-23 1960-12-23 Internally-threaded glass helix

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4427560A GB895799A (en) 1960-12-23 1960-12-23 Internally-threaded glass helix

Publications (1)

Publication Number Publication Date
GB895799A true GB895799A (en) 1962-05-09

Family

ID=10432543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4427560A Expired GB895799A (en) 1960-12-23 1960-12-23 Internally-threaded glass helix

Country Status (1)

Country Link
GB (1) GB895799A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451642A1 (en) * 1979-03-16 1980-10-10 Hughes Aircraft Co METHOD FOR MANUFACTURING A DELAY LINE WITH A PROPELLER STRUCTURE, AND THIS DELAY LINE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451642A1 (en) * 1979-03-16 1980-10-10 Hughes Aircraft Co METHOD FOR MANUFACTURING A DELAY LINE WITH A PROPELLER STRUCTURE, AND THIS DELAY LINE

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