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US3162933A - Method of processing cathode ray tubes - Google Patents

Method of processing cathode ray tubes Download PDF

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Publication number
US3162933A
US3162933A US272619A US27261963A US3162933A US 3162933 A US3162933 A US 3162933A US 272619 A US272619 A US 272619A US 27261963 A US27261963 A US 27261963A US 3162933 A US3162933 A US 3162933A
Authority
US
United States
Prior art keywords
strap
tube
band
around
cathode ray
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
US272619A
Other languages
English (en)
Inventor
Alan M Trax
James J Monagle
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to US272619A priority Critical patent/US3162933A/en
Priority to GB13685/64A priority patent/GB1028075A/en
Priority to FR970516A priority patent/FR1406501A/fr
Priority to NL646403879A priority patent/NL145394B/nl
Priority to BE646507A priority patent/BE646507A/xx
Priority to DE1489244A priority patent/DE1489244C3/de
Application granted granted Critical
Publication of US3162933A publication Critical patent/US3162933A/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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
    • 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
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]
    • 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
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • Both crimped and bolted bands are objectionable because they require the use of a protruding element at the joint of the strap ends. Such protruding elements often interfere with the mounting of the tube in a chassis or cabinet. Moreover, crimped and bolted fastenings sometime slip or relax when placed under prolonged tensions and thus lose the protective quality which they are designed to provide. The conventional crimped fastener also results in a weakening of the strap because of a cut which is made int-o the strap to produce the crimped seal. For these reasons welded bands are preferred.
  • Another object is to provide a method for applying a welded implosion prevention band to the tube with a good control of the final tension achieved.
  • a metal strap is first heated to expand it and is then wrapped around both the envelope of a cathode ray tube and a welding electrode, lapped over itself at the electrode, and mechanically tensioned.
  • the hot strap is then welded :at the lap, the electrode withdrawn from between the strap and the tube, and the strap cooled.
  • the welded band is made on the tube, it is custom sized to the tube. Accordingly, the ultimate tension produced in the band can be established accurately in a desired range. Even though a welding electrode is inserted between the strap and the tube in order to make the weld, and even though removal of the electrode may 3,l2,933 Patented Dec. 2%, 1964:
  • FIGURE 1 is a top plan view partly in section of a cathode ray tube incorporating the invention
  • FIGURE 2 is a front elevation view of the tube of FIGURE 1;
  • FIGURE 3 is a front elevation view of a portion of the tube of FIGURES 1 and 2 illustrating the welding step of the invention.
  • the invention may be embodied in a cathode ray tube which includes: a pair of contoured metallic rim plates disposed under the welded compression band, and a coating of fiberglass cloth bonded to the funnel of the tube bulb with a suitable resin.
  • the welded compression band applied by the method herein described can also be used, for example, in combination with a sheet of plastic material draped over the faceplate of thetube as described by Harrison in US. Patent 2,828,799, issued April 1, 1958, or in combination with a fitted glass cap bonded to the faceplate of a tube as described by Hedler et al. in US. Patent 3,075,870, issued January 29, 1963, or by itself.
  • the purpose of the welded band is to relieve tensile stress in the bulb by circumferentially compressing the bulb to within some prescribed lirnits.
  • a cathode ray tube 10 which includes an evacuated envelope (bulb) 11.
  • the envelope 11 comprises a faceplate 12, a neck 14, and an interconnecting funnel 15.
  • the funnel 15 includes a substantially rectangularly-shaped cylindrical hoop section 16 adjacent to the faceplate 12.
  • the neck 14 is closed at its distal end with a stern 3.7.
  • a phosphor screen 18 is disposed on the internal surface of the laceplate 12, and an electron gun 19 is disposed in the neck 14.
  • Atmospheric pressure pressing against the external surface of the faceplate 12 may exert two or three tons total force against the faceplate. This force tends to push the faceplate 12 into the hoop 16 in a manner similar to a cork being pushed into a bottle. A a result, circumferential tensile stresses as high as 1000 pounds per square inch are created in the hoop 16.
  • a stress reducing means for the tube 10 is provided in the form of a tensioned compression band 20 which encircle the hoop'16.
  • a pair of semi-encircling metallic rim plates 22, which are contoured to the shape of the bulb 11, are pnovided as a foundation for the'band 20 to uniformly distribute tothe hoop 16 any non-uniform contact which the band 2t) might otherwise make with the hoop.
  • the ends of each of the rim plates 22 terminate adjacent to each other in the vicinity of the central portion of one of the short sides 24 of the rectangular hoop 16.
  • the rim plates may be L-shaped with their ends terminating adjacent to each other at two of the corner of the hoop 16.
  • the band 20 comprises a length 'of metal strap which is wrapped tightly around both the hoop 16 and the rim plates 22, and has its ends overlapped and welded together.
  • the welded lap 25 may, as shown in FIGURE 2, be positioned centrally of one of the long sides 26 of the rectangular hoop 16.
  • the band 20 may, for example, comprise carbon steel strapping, work hardened to about 100,000 p.s.i. tensile strength and have a light zinc plating thereon to retard oxidation and facilitate weldability.
  • the strap may be from /2 to inch wide and from 20 to 23 mils thick. However, such strap composition and dimensions are not critical.
  • the tapered portion 28 of the funnel 15 is covered by a fitted piece of fiberglass cloth 30 which is bonded to the funnel with a suitable resin such as an epoxy.
  • the fiberglass cloth 30 extends axially along the bulb 11 from closely adjacent to the rim plates 22 back to that portion of the tube where a magnetic deflection yoke would conventionally be mounted.
  • the cloth 3% is provided with an opening therein exposing a high voltage contact terminal 32 of conventional design.
  • a length of suitable strapping is heated to a preselected temperature to thermally expand it.
  • a preferred method of heating the strap is to pass an electrical current through the strap. It has been found that a heating of about of the length of the strap required to encircle the envelope 11 is sufficient to produce the desired elongation thereof.
  • straps In preferred strap heating schedules for 16, 19 and 23 inch (diagonal dimension of faceplate) cathode ray tubes, straps have been suitably heated from 50 C. up to several hundred degrees centigrade with currents of 50 to 300 amperes from a 10 volts A.C. supply.
  • a temperature detection device such as a surface pyrometer may be used to determine when the strap has reached a suitable temperature.
  • the temperature to which any particular strap is raised is dependent not only upon the ultimate tension which it is desired to produce in the wedled band 20, but also upon the amount of mechanical tensioning which is subsequently produced in the strap when it is wrapped around the envelope ll.
  • the strap heating can be provided by: disposing a coil of metal strapping in an oven; by passing the strapping through a heated tube or torch flame located between the supply reel and the machine used to apply and weld the strap; or by heating the entire strapping and welding machine as well as the supply coil of strapping therein.
  • the mechanical tension produced in the band can, if desired, be quite low.
  • the mechanically produced tension need only be high enough to custom size the band to the particular envelope around which it is being applied and need only be suifcient to produce in combination with the subsequent thermal shrinkage of the band the desired ultimate tension.
  • the mechanical tensioning and welding of the strap may be performed by any suitable strapping and welding machine.
  • One such suitable machine having hydraulically powered tensioning means is marketed by Acme Steel Company and identified as Type Fl.
  • a banding operation is performed as illustrated in FIGURE 3.
  • the envelope 11 and the rim plates 22 are placed in position on the machine against a pair of welding electrodes 34 and a pair of strap gripper seats 35.
  • the end section of a supply reel of metal strapping is fed out, and a pair of leads from an electrical power supply-are connected to spaced points thereon. Current is passed through the strapping between the spaced points to heat it.
  • the strapping is then positioned around the envelope and lapped over itself opposite the electrodes 34.
  • the end of the heated strap is gripped by a first gripper 36 adjacent to the lap and then is tensioned with a predetermined force by an electric clutch and/or a hydraulically powered second gripper 37.
  • the tensioned strap is gripped by a third gripper 38, and is then severed just beyond the lap by a cutter 39.
  • a shorting block 40 is then clamped against the lapped strap opposite the electrodes 34 and the welds are made.
  • the presence of the welding electrodes 34 and of the strap gripper seats 35 between the band 20 and the envelope 11 result in the band 20 being slightly lifted out of contact with the rim plates 22.
  • the electrodes 34 and the strap seats 35 are forced from between'the still hot band 20 and the r m plates 22 thereby allowing the .it by thermal expansion, it is placed around the hoop 16 i example, where a tension of approximately 1200 pounds has been mechanically produced in the band for a 19 inch tube, the relaxation may be to a tension as low as 350 pounds.
  • the band is now permitted to cool and contract and thus tighten about the envelope 11. More over, since the band 20 has been fabricated on the envelope 1i and thereby custom sized to it, the ultimate band tension can be consistently established from tube to tube to within a desired range.
  • the fiberglass cloth 30 may be'bonded to the funnel 12 either before or after the band 20 is applied to the envelope ll.
  • the fiberglass cloth 3%? may simply be cut and fitted to the funnel l2 and an epoxy resin sprayed, brushed, or rolled onto the cloth.
  • the particular choice and application of fiberglass cloth and bonding resin is neither critical nor does it form a part of this invention, and therefore need not be further described herein.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US272619A 1963-04-12 1963-04-12 Method of processing cathode ray tubes Expired - Lifetime US3162933A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US272619A US3162933A (en) 1963-04-12 1963-04-12 Method of processing cathode ray tubes
GB13685/64A GB1028075A (en) 1963-04-12 1964-04-02 Method of processing cathode ray tubes
FR970516A FR1406501A (fr) 1963-04-12 1964-04-10 Procédé pour protéger les tubes à rayons cathodiques contre l'implosion
NL646403879A NL145394B (nl) 1963-04-12 1964-04-10 Werkwijze voor het tegen implosie bestand maken van een kathodestraalbuis.
BE646507A BE646507A (nl) 1963-04-12 1964-04-13
DE1489244A DE1489244C3 (de) 1963-04-12 1964-04-13 Verfahren zum Erhohen der Im plosicnsfestigkeit von Kathodenstrahl rohrefi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US272619A US3162933A (en) 1963-04-12 1963-04-12 Method of processing cathode ray tubes

Publications (1)

Publication Number Publication Date
US3162933A true US3162933A (en) 1964-12-29

Family

ID=23040569

Family Applications (1)

Application Number Title Priority Date Filing Date
US272619A Expired - Lifetime US3162933A (en) 1963-04-12 1963-04-12 Method of processing cathode ray tubes

Country Status (5)

Country Link
US (1) US3162933A (nl)
BE (1) BE646507A (nl)
DE (1) DE1489244C3 (nl)
GB (1) GB1028075A (nl)
NL (1) NL145394B (nl)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314566A (en) * 1964-12-18 1967-04-18 Owens Illinois Inc Reinforced cathode-ray tube and face plate therefor
US3403805A (en) * 1966-05-31 1968-10-01 Owens Illinois Inc Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3512234A (en) * 1966-09-14 1970-05-19 Hendrik Bongenaar Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method
US3597537A (en) * 1969-06-02 1971-08-03 Sony Corp Implosion-resistant cathode-ray tube utilizing a metal band
US3686727A (en) * 1971-03-22 1972-08-29 Sylvania Electric Prod Method of fabricating a multibeam electron gun structure
US3818557A (en) * 1971-01-08 1974-06-25 Philips Corp Method of manufacturing an implosion-free picture tube for television display
US4160510A (en) * 1978-01-30 1979-07-10 Rca Corporation CRT with tension band adapted for pusher-type tensioning and method for producing same
US4168010A (en) * 1977-02-28 1979-09-18 Zenith Radio Corporation Implosion protected color cathode ray tube bulb and bulb components
US4169274A (en) * 1978-03-27 1979-09-25 Gte Sylvania Incorporated Implosion resistant cathode ray tube
US4170027A (en) * 1978-03-27 1979-10-02 Gte Sylvania Incorporated Implosion resistant cathode ray tube and fabricating process
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4772112A (en) * 1984-11-30 1988-09-20 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements
US4895438A (en) * 1983-12-06 1990-01-23 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements
US4896955A (en) * 1983-12-06 1990-01-30 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743514A (en) * 1953-06-01 1956-05-01 George P Duecy Method of reinforcing concrete units
GB753696A (en) * 1953-04-24 1956-07-25 Philips Electrical Ind Ltd Improvements in or relating to cathode-ray tubes of the kind comprising a cone and aglass window
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes

Patent Citations (3)

* 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
GB753696A (en) * 1953-04-24 1956-07-25 Philips Electrical Ind Ltd Improvements in or relating to cathode-ray tubes of the kind comprising a cone and aglass window
US2743514A (en) * 1953-06-01 1956-05-01 George P Duecy Method of reinforcing concrete units

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314566A (en) * 1964-12-18 1967-04-18 Owens Illinois Inc Reinforced cathode-ray tube and face plate therefor
US3403805A (en) * 1966-05-31 1968-10-01 Owens Illinois Inc Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3512234A (en) * 1966-09-14 1970-05-19 Hendrik Bongenaar Method of providing a clamping band around the bulb of a television picture tube and implosion-free tube manufactured by means of this method
US3597537A (en) * 1969-06-02 1971-08-03 Sony Corp Implosion-resistant cathode-ray tube utilizing a metal band
US3818557A (en) * 1971-01-08 1974-06-25 Philips Corp Method of manufacturing an implosion-free picture tube for television display
US3686727A (en) * 1971-03-22 1972-08-29 Sylvania Electric Prod Method of fabricating a multibeam electron gun structure
US4168010A (en) * 1977-02-28 1979-09-18 Zenith Radio Corporation Implosion protected color cathode ray tube bulb and bulb components
US4160510A (en) * 1978-01-30 1979-07-10 Rca Corporation CRT with tension band adapted for pusher-type tensioning and method for producing same
US4169274A (en) * 1978-03-27 1979-09-25 Gte Sylvania Incorporated Implosion resistant cathode ray tube
US4170027A (en) * 1978-03-27 1979-10-02 Gte Sylvania Incorporated Implosion resistant cathode ray tube and fabricating process
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4895438A (en) * 1983-12-06 1990-01-23 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements
US4896955A (en) * 1983-12-06 1990-01-30 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements
US4772112A (en) * 1984-11-30 1988-09-20 Cvi/Beta Ventures, Inc. Eyeglass frame including shape-memory elements

Also Published As

Publication number Publication date
DE1489244B2 (de) 1973-03-29
NL6403879A (nl) 1964-10-13
NL145394B (nl) 1975-03-17
BE646507A (nl) 1964-07-31
DE1489244A1 (de) 1969-03-20
DE1489244C3 (de) 1973-10-11
GB1028075A (en) 1966-05-04

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