US2708788A - Rendering metal meshes taut - Google Patents

Rendering metal meshes taut Download PDF

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Publication number
US2708788A
US2708788A US30234A US3023448A US2708788A US 2708788 A US2708788 A US 2708788A US 30234 A US30234 A US 30234A US 3023448 A US3023448 A US 3023448A US 2708788 A US2708788 A US 2708788A
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US
United States
Prior art keywords
mesh
taut
metal
frame
foil
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
US30234A
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English (en)
Inventor
Cassman Harry
Jeynes William Edward
Webley Reginald Sidney
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of US2708788A publication Critical patent/US2708788A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/025—Mounting or supporting arrangements for grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/002—Chemical composition and manufacture chemical
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/4962—Grille making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49867—Assembling or joining with prestressing of part of skin on frame member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49888—Subsequently coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49892—Joining plate edge perpendicularly to frame

Definitions

  • a taut mesh of very fine pitch In the manufacture of television transmission tubes it is frequently necessary to employ a taut mesh of very fine pitch, as for example when it is desired to evaporate material through the mesh on to a surface so as to form a multiplicity of discrete elements on the surface.
  • Various methods have been proposed for rendering the mesh taut and according to one method a copper mesh is mounted on a frame having a coefficient of thermal expansion slightly less than the material of the mesh, and it is then heated in vacuo to a temperature of about 600 to 900 C., at which temperature the mesh contracts slowly in relation to the frame and becomes taut, heating being stopped when a suitable degree of tension is attained, which can be judged by experience. It is believed that the contraction of the mesh is due to recrystallisation of the mesh material promoted by the heat treatment.
  • the object of the present invention is to provide an improved method of treating thin metal meshes or foils so as to tauten them, with a view to providing a method which is less critical and less dependent upon the experience of the operator.
  • a method of treating a thin metal mesh or foil comprising the steps of extending the mesh or foil on a substantially rigid support, securing the edges of the mesh to the support with the portion of the mesh or foil between the edges thereof free from attachment to the support, applying in contact with said metal mesh or foil a deposit of a metal predetermined to alloy with the metal of the mesh or foil to produce shrinkage thereof, and heating the mesh or foil to cause such alloying to occur with consequent shrinkage of the mesh or foil relative to the support.
  • the heating may be effected either in air or in vacuo and the alloying of the metals is accompanied by the desired contraction or shrinkage of the mesh or foil, the said contraction or shrinkage occurring at a lower temperature and more rapidly than would otherwise be the case, the alloying of the two metals being believed to be responsible for a more rapid crystal growth in the material of the mesh or foil as it re-crystallises due to the heat treatment.
  • the method is therefore less critical with respect to temperature and time, and in addition, since the alloying of the metals is often accompanied 2,708,788 Patented May 24, 1955 by a change in colour, the method may be less dependent upon the experience of the operator.
  • a silver mesh 1 having for example'400 filaments per linear inch and a thickness of 0.0004 inch (the mesh being therefore flexible) is cemented to a frame 2 of, for example, stainless steel, by applying a suspension of colloidal silver in oil to the edges of the mesh, applying the mesh to the frame while the mesh is in an extended, that is a more or less taut condition, and subsequently drying out the suspension by heat treatment so that the edges of the mesh are left firmly adhering to the frame 2 by means of a thin layer of silver 3 with the portion of the mesh between its edges free from attachment to the frame as indicated in the drawing.
  • the mesh may of course be secured to the frame in other suitable ways, for example by applying a nickel tape to the edges of the mesh and welding the tape to the frame through the interstices of the mesh.
  • the mesh and frame are shown in transverse section, and it will be appreciated that their relative dimensions are not shown in correct proportion.
  • the mesh is coated with a thin film of gold 4, of a thickness, say, of 10- inches in the case of a mesh with the dimensions given, the film being applied by any suitable method, for example by plating the gold on to the mesh or by sputtering or evaporating the gold on to the mesh.
  • the mesh secured to the frame is then heated either in air or in vacuo to a temperature of between 300 and 500 C., the heating being continued until the alloying of the two metals is observed, accompanied by a tautening of the mesh.
  • alloying accurs the colour of the mesh changes from gold to a pale yellow.
  • the invention has been described with reference to the treatment of thin metal meshes so as to tauten them, but the invention can also be applied to the treatment of metal grids or grills such as are employed in other forms of electron discharge devices, or to other arrays of metal filaments which require to be supported in a taut condition. It is to be understood therefore that the expression metal mesh used herein and in the claims is intended to include such arrays of metal filaments.
  • the invention may also be applied where it is desired to provide a metal foil supported in a taut condition.
  • the method is not limited to the employment of a silver mesh or foil having gold deposited on it, but it can be applied to other metal which will alloy together and produce shrinkage, for example it may be applied to a nickel mesh or foil having copper deposited thereon.
  • a method of treating a flexible metal mesh or foil structure suitable for use in an electron discharge device to render it taut comprising the steps of extending the structure on a substantially rigid support, securing the edges of the structure to the support with the portion of the structure between its edges free from attachment to the support, applying to the surface of said structure a deposit of a metal predetermined to alloy with the metal of the structure to produce shrinkage of the structure, and finally heating the structure to cause alloying of the metal of said structure with the deposited metal and consequent shrinkage of the unattached portion of said structure relative to said support.
  • a method of treating a flexible silver mesh or foil structure suitable for use in an electron discharge device to render it taut comprising the steps of extending the structure on a substantially rigid support, securing the edges of the structure to the support with the portion of the structure between its edges free from attachment to the support, applying a deposit of gold to the surface of said structure, and finally heating the structure to cause alloying of the silver of the structure with said gold and consequent shrinkage of the unattached portion of the structure relative to said support.
  • a method of treating a flexible silver mesh suitable for use in an electron discharge device to render it taut comprising the steps of extending the mesh on a substantially rigid support, securing the edges of the mesh to the support with the portion of the mesh between its edges free from attachment to the support, applying a deposit of gold to the surface of said mesh, and finally heating the mesh to a temperature between 300 C. and 500 C. to cause alloying of the silver of the mesh with said gold and consequent shrinkage of the unattached portion of the mesh relative to the support.
  • a method of treating a flexible silver mesh suitable Cit for use in an electron discharge device to render it taut comprising the steps of extending the mesh on a steel frame conforming to a closed figure, securing the edges of the mesh to the frame with the portion of the mesh between its edges free from attachment to the frame, applying a deposit of gold to the surface of said mesh, and finally heating the mesh to cause alloying of said silver and said gold and consequent shrinkage of the unattached portion of the mesh relative to said frame.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Wire Processing (AREA)
US30234A 1947-06-03 1948-06-01 Rendering metal meshes taut Expired - Lifetime US2708788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14609/47A GB689564A (en) 1947-06-03 1947-06-03 Improvements in or relating to the treatment of metal meshes or foils so as to render them taut

Publications (1)

Publication Number Publication Date
US2708788A true US2708788A (en) 1955-05-24

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Family Applications (1)

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US30234A Expired - Lifetime US2708788A (en) 1947-06-03 1948-06-01 Rendering metal meshes taut

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US (1) US2708788A (en(2012))
GB (1) GB689564A (en(2012))
NL (1) NL76863C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813772A (en) * 1953-08-24 1957-11-19 Chromatic Television Lab Inc Television tube grid structure
US3099874A (en) * 1958-02-06 1963-08-06 Telefunken Gmbh Method of manufacturing magnetic core matrices
US3128531A (en) * 1959-10-22 1964-04-14 Nat Res Dev Dynodes for electron discharge tubes and methods of making same
US20050189046A1 (en) * 2004-01-22 2005-09-01 Silver Silk Llc. Knitted silver alloy fashion accessory and method of manufacture
WO2006051338A2 (en) 2004-11-15 2006-05-18 Middlesex Silver Co. Limited Fabric structure comprising silver-germanium-copper alloy

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1106516A (en) * 1910-06-09 1914-08-11 Laurence S Lachman Art of stretching sheet material.
US1275022A (en) * 1916-11-09 1918-08-06 Western Electric Co Method of and apparatus for manufacturing telephone-diaphragms.
US1747847A (en) * 1928-05-22 1930-02-18 Bell Telephone Labor Inc Method of manufacturing acoustic radiators
US1863073A (en) * 1930-04-23 1932-06-14 Bell Telephone Labor Inc Method and means for tensioning and for mounting diaphragms
US1904241A (en) * 1926-12-31 1933-04-18 Kammerer Erwin Compound metal stock
US2162808A (en) * 1937-11-30 1939-06-20 Rca Corp Electrode structure for television transmitting tubes
US2330202A (en) * 1939-12-07 1943-09-28 Joseph B Brennan Method of making electrodes
CA475393A (en) * 1951-07-17 B. Law Harold Methods of mounting screens for cathode ray tubes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA475393A (en) * 1951-07-17 B. Law Harold Methods of mounting screens for cathode ray tubes
US1106516A (en) * 1910-06-09 1914-08-11 Laurence S Lachman Art of stretching sheet material.
US1275022A (en) * 1916-11-09 1918-08-06 Western Electric Co Method of and apparatus for manufacturing telephone-diaphragms.
US1904241A (en) * 1926-12-31 1933-04-18 Kammerer Erwin Compound metal stock
US1747847A (en) * 1928-05-22 1930-02-18 Bell Telephone Labor Inc Method of manufacturing acoustic radiators
US1863073A (en) * 1930-04-23 1932-06-14 Bell Telephone Labor Inc Method and means for tensioning and for mounting diaphragms
US2162808A (en) * 1937-11-30 1939-06-20 Rca Corp Electrode structure for television transmitting tubes
US2330202A (en) * 1939-12-07 1943-09-28 Joseph B Brennan Method of making electrodes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813772A (en) * 1953-08-24 1957-11-19 Chromatic Television Lab Inc Television tube grid structure
US3099874A (en) * 1958-02-06 1963-08-06 Telefunken Gmbh Method of manufacturing magnetic core matrices
US3128531A (en) * 1959-10-22 1964-04-14 Nat Res Dev Dynodes for electron discharge tubes and methods of making same
US20050189046A1 (en) * 2004-01-22 2005-09-01 Silver Silk Llc. Knitted silver alloy fashion accessory and method of manufacture
WO2006051338A2 (en) 2004-11-15 2006-05-18 Middlesex Silver Co. Limited Fabric structure comprising silver-germanium-copper alloy
US20080128054A1 (en) * 2004-11-15 2008-06-05 Peter Gamon Johns Fabric Structure

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Publication number Publication date
NL76863C (en(2012))
GB689564A (en) 1953-04-01

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