US3512234A - Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method - Google Patents

Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method Download PDF

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Publication number
US3512234A
US3512234A US667702A US3512234DA US3512234A US 3512234 A US3512234 A US 3512234A US 667702 A US667702 A US 667702A US 3512234D A US3512234D A US 3512234DA US 3512234 A US3512234 A US 3512234A
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US
United States
Prior art keywords
band
bulb
glass
clamping
clamping band
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Expired - Lifetime
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US667702A
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English (en)
Inventor
Hendrik Bongenaar
Willem Fokko Nienhuis
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Individual
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    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers

Definitions

  • the invention relates to a method of providing a clamping band around the bulb of a television picture tube and more particularly to a band which is disposed entirely on the side of the mold match line of the window remote from the front surface of this window.
  • the invention further relates to a television picture tube provided with such a clamping band the part of the bulb located between the front surface and the mold match line of the window being free.
  • the part of the bulb of a picture tube located between the front surface and the mold match line of the window should be free with smaller tubes, in which the diagonal of the window is less than 35 cm., a sutlicient freedom of implosion can still be obtained with the known embodiments provided with clamping bands.
  • an intermediate band is provided around the bulb on the side of the mold match line remote from the front surface of the window, whereupon one or more clamping bands having a width at the most equal to the width of the intermediate band are provided over said intermediate band so that the projection of each clamping band on the glass surface is covered by the intermediate band throughout the width, the clamping band or bands all being stretched and steps being taken by which the pressure exerted on the bulb through the intermediate band by the clamping band or bands is distributed symmetrically and uniformly along the periphery of the bulb, while the intermediate band is xed on the glass, and/ or the clamping band or bands are iixed on the intermediate band preferably by means of an adhesive.
  • the adhesive may extend in the form of a thin layer to the front surface of the window.
  • a symmetrical and uniform distribution of compression on the bulb can be obtained in different ways, for example, by winding a long strap or steel with the required tensile force into the intermediate band. A few turns are already sufficient. First the beginning of the steel strap can be welded to the intermediate band. Subsequently, the end of the clamping strap can be welded to the underlying turn or turns.
  • an interrupted clamping band which is tightened by means of bolts or clamps, a lubricant being provided on the intermediate band at the corners of the window, so that the clamping band can slide over theYY intermediate band and hence the band is stretched more uniformly all around.
  • two interrupted clamping bands are arranged one on the other, the joint being located on opposite straight sides.
  • clamping band' may be used which is interrupted at several points, but this is more complicated.
  • the clamping band H In view of the large'tensile force the clamping band H must be capable of withstanding at the comparatively small width, substantially only YYclamping bands of hardened Ysteel or high-grade steel can be employed.rThe use of an intermediate band of a material which is hard but which nevertheless is :still softer than glass is required to prevent scratching of the glass For itpis not permissible to provide a clamping band of hardened steel directly on the glass and to tighten it, since this may result in scratching'of the glass, which scratches may Vafterwards give rise to cracks so that the bulb becomes leaky.
  • the intermediate band may be interrupted provided that the space between the intermediate band and the glass Wallis filled with a filler material of sufficient hardness. For at the interrupting area, an irregularity is formed on the Contact surface of the intermediate band and the glass which must be eliminated by the said filler material. Moreover, the filler material mustl adhere sufficiently to the metal of the ⁇ intermediate band and to the glass so that the band cannot slide off the bulb by shocks and the like. This may also be achieved by roughening the glass surface, in particular at the corners.
  • the intermediate band used is preferably an uninterrupted annular band which is tautly stretched around the bulb. It is then ensured that the dimensions of the band are such that the band, after being provided on the bulb, just sufficiently surrounds the bulb so that the intermediate band, after the clamping band is provided and stretched over it, bears uniformly on the bulb and does not tend to corrugate. This is preferably achieved by heating the intermediate band before slipping it into the bulb, since the tolerances of the glass of the bulbs can then be neutralized. The pressure exerted on the bulb by such a tautly arranged intermediate band before the clamping band is provided, is negligible when compared with the compression required.
  • the llerand adhesive material used may be polyvinyl acetate with polyester, polyurethane or epoxy resin.
  • the clamping band may also be locally coated with such adhesive in order to prevent the band from being displaced over the intermediate band.
  • the layer of adhesive may extend up to the front surface of the window in order to obtain an additional protection of the free glass surface, but this is not essential to the freedom of implosion.
  • the bands are preferably not provided before the picture tube has otherwise been completely finished, so that the bands need be no longer strongly heated, which could result in a decrease of the tensile force.
  • FIG. 1 is partly a longitudinal sectional view and partly a side elevation of an embodiment of a picture tube in accordance with the invention.
  • FIG. 2 shows a detail thereof.
  • a layer of adhesive 5, by which the intermediate band 6 is stuck to the glass, is appiied to the glass on the side of the meid match line 4 i.e., the greatest cross-section of the bulb, remote from the front surface on the window.
  • two clamping bands 7 and 7 made of a hard kind of steel such as hardened steel or high-grade steel (chromium-nickel steel), are provided on the intermediate band 6 so that a symmetrically and uniformly distributed compression is exerted on the bulb, for example, by providing a lubricant at the corners between the clamping t 4 band 7 Yand the intermediate band 6, and by disposing the joints on opposite sides.
  • a hard kind of steel such as hardened steel or high-grade steel (chromium-nickel steel
  • the part of the protruding side surface of the window which is located beyond the mold matchgline 4 and on which the bands 6, 7, 7, are clamped, has a surface, at least at the corners of the window, which is substantially parallel to the axis of the tube so that the bands are less liablerto slide off this surface.
  • the clamping band is chosen to be so narrow that it does not cover the sealing seam 3.
  • the intermediate band may extend beyond the seam 3 and the space between this band and the glass may be filled at least in part, preferably with a filler material 12 (synthetic resin) which need not 'De identical with the adhesive 5.
  • the fastening lugs 11 are fastened to the intermediate band 6 preferably by riveting c-r welding.
  • the clamping band 7 is tightened by means of a tightening bolt 8.
  • the intermediate band 6 has a width of, for example, 45 mm. and a thickness of 1.2 mm. and consists of ingot steei, while the two clamping bands arranged one on the other each have a width of i8 mm. and a thickness of 0.8 mm. and consist of hardened carbon steel or highgrade steel (chromium-nickel steel).
  • the invention may also be carried out differently.
  • the clamping band must joint the mold match line, also if this band is much narrower than the distance between the mold match line and the sealing seam.
  • a method of providing a clamping band around the glass bulb of a ⁇ television picture display tube having a window portion sealed to a conical portion in order to eliminate the risk of implosion, said window having a larger cross section than and -spaced from the front surface and said larger cross section remaining free comprising the steps first providing an intermediate band around the bulb on the side of said larger cross section remote from the front surface of the window, thereafter providing at least one additional clamping band having a width at the most equal to the width of the intermediate band, the projection of each clamping band on the glass surface being covered throughout the width by the intermediate band, thereafter stretching the clamping band while distributing the pressure exerted on the bulb by the clamping band through the intermediate band symmetrically and uniformly along the periphery of the bulb, and securing the intermediate band onto the glass and the clamping band onto the intermediate band.
  • clamping band is provided on the intermediate band by winding on to it one or more turns of a long strap of steel.
  • the rial of the intermediate band is softer than -the glass of the bulb, while the clamping band consists of a hard JOHN F- CAMPBELLPIIIUQTY EXamlIleI kind of steel.

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US667702A 1966-09-14 1967-09-14 Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method Expired - Lifetime US3512234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6612938A NL6612938A (enrdf_load_stackoverflow) 1966-09-14 1966-09-14

Publications (1)

Publication Number Publication Date
US3512234A true US3512234A (en) 1970-05-19

Family

ID=19797661

Family Applications (1)

Application Number Title Priority Date Filing Date
US667702A Expired - Lifetime US3512234A (en) 1966-09-14 1967-09-14 Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method

Country Status (8)

Country Link
US (1) US3512234A (enrdf_load_stackoverflow)
AT (1) AT275615B (enrdf_load_stackoverflow)
BE (1) BE703842A (enrdf_load_stackoverflow)
CH (1) CH472781A (enrdf_load_stackoverflow)
DE (1) DE1614276A1 (enrdf_load_stackoverflow)
ES (1) ES344966A1 (enrdf_load_stackoverflow)
GB (1) GB1191506A (enrdf_load_stackoverflow)
NL (1) NL6612938A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597537A (en) * 1969-06-02 1971-08-03 Sony Corp Implosion-resistant cathode-ray tube utilizing a metal band
US3626093A (en) * 1969-10-15 1971-12-07 Thorn Radio Valves And Tubes L Implosion-resistant cathode-ray tubes
US3675287A (en) * 1970-10-11 1972-07-11 Westinghouse Electric Corp Method for providing mounting brackets on a cathode ray tube integral with the implosion protection system of the cathode ray tube
US3730990A (en) * 1969-08-01 1973-05-01 Hitachi Ltd Implosion-proof cathode-ray tube
US3890464A (en) * 1973-12-10 1975-06-17 Zenith Radio Corp Dry, impulse-resistant implosion protection system for large screen cathode ray tubes
US4054913A (en) * 1976-09-01 1977-10-18 Zenith Radio Corporation Hybrid implosion protection system for a flangeless faceplate color cathode ray tube and method of assembly thereof
US4944706A (en) * 1987-03-20 1990-07-31 Hitachi, Ltd. Cathode ray tube and method of making the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158419A (en) * 1977-12-27 1979-06-19 Rca Corporation Implosion protected CRT
CA1120990A (en) * 1977-12-27 1982-03-30 Donald W. Bartch Crt with peripheral plastic coating and method of making same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US2874017A (en) * 1956-11-07 1959-02-17 Owens Illinois Glass Co Prevention of fracture in glass cathode-ray tubes
US3162933A (en) * 1963-04-12 1964-12-29 Rca Corp Method of processing cathode ray tubes
US3220592A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3260397A (en) * 1961-02-24 1966-07-12 Philips Corp Cathode ray tube and method of making same
US3271516A (en) * 1962-10-22 1966-09-06 Owens Illinois Inc Implosion resistant cathode ray tube with integral mounting elements to facilitate installation
US3314566A (en) * 1964-12-18 1967-04-18 Owens Illinois Inc Reinforced cathode-ray tube and face plate therefor
US3317172A (en) * 1965-06-02 1967-05-02 George K Garrett Company Picture tube mounting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US2874017A (en) * 1956-11-07 1959-02-17 Owens Illinois Glass Co Prevention of fracture in glass cathode-ray tubes
US3260397A (en) * 1961-02-24 1966-07-12 Philips Corp Cathode ray tube and method of making same
US3220592A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3271516A (en) * 1962-10-22 1966-09-06 Owens Illinois Inc Implosion resistant cathode ray tube with integral mounting elements to facilitate installation
US3162933A (en) * 1963-04-12 1964-12-29 Rca Corp Method of processing cathode ray tubes
US3314566A (en) * 1964-12-18 1967-04-18 Owens Illinois Inc Reinforced cathode-ray tube and face plate therefor
US3317172A (en) * 1965-06-02 1967-05-02 George K Garrett Company Picture tube mounting

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597537A (en) * 1969-06-02 1971-08-03 Sony Corp Implosion-resistant cathode-ray tube utilizing a metal band
US3730990A (en) * 1969-08-01 1973-05-01 Hitachi Ltd Implosion-proof cathode-ray tube
US3626093A (en) * 1969-10-15 1971-12-07 Thorn Radio Valves And Tubes L Implosion-resistant cathode-ray tubes
US3675287A (en) * 1970-10-11 1972-07-11 Westinghouse Electric Corp Method for providing mounting brackets on a cathode ray tube integral with the implosion protection system of the cathode ray tube
US3890464A (en) * 1973-12-10 1975-06-17 Zenith Radio Corp Dry, impulse-resistant implosion protection system for large screen cathode ray tubes
US4054913A (en) * 1976-09-01 1977-10-18 Zenith Radio Corporation Hybrid implosion protection system for a flangeless faceplate color cathode ray tube and method of assembly thereof
US4944706A (en) * 1987-03-20 1990-07-31 Hitachi, Ltd. Cathode ray tube and method of making the same

Also Published As

Publication number Publication date
GB1191506A (en) 1970-05-13
AT275615B (de) 1969-10-27
ES344966A1 (es) 1969-01-01
BE703842A (enrdf_load_stackoverflow) 1968-03-13
NL6612938A (enrdf_load_stackoverflow) 1968-03-15
DE1614276A1 (de) 1970-05-27
CH472781A (de) 1969-05-15

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