US3637930A

US3637930A - Yoke-retaining device

Info

Publication number: US3637930A
Application number: US874528A
Authority: US
Inventors: James L Meier
Original assignee: Admiral Corp
Current assignee: Admiral Corp
Priority date: 1969-11-06
Filing date: 1969-11-06
Publication date: 1972-01-25
Anticipated expiration: 1989-01-25
Also published as: CA929577A; CA919817A

Abstract

A device for positioning a deflection yoke about the gun portion of a cathode-ray tube. The yoke-retaining device is formed of a molded plastic material and has a collar or ring portion which is supported against the rear envelope of the tube by a series of integrally formed leg members. The collar portion has a series of integrally formed springlike tabs which project radially inwardly of the retainer to center the yoke within the ring. The tablike spring members hold the yoke firmly in directions transverse to the axis of the retainer, while permitting free movement of the yoke in the axial direction. A series of flanges are provided at the leg side of the collar portion to confine the yoke within the retaining device. Each of the flanges has a guide rib associated therewith extending in the axial direction at spaced points along the inner surface of the collar portion. These ribs prevent substantial pivoting of the yoke as it is being positioned within the yoke retainer.

Description

United States Patent 1 Meier [4 1 Jan. 25, 1972 YOKE-RETAINING DEVICE ABSTRACT [72] lnvemor; Jam Meier. Des p i m A device for positioning a deflection yoke about the gun portion of a cathode-ray tube. The yoke-retaining device is Assign: Admll'fil Corporlfloni fl formed of a molded plastic material and has a collar or ring [22] Filed; No 6 1969 portion which is supported against the rear envelope of the Appl. No.: 874,528

Primary Examiner Robert Segal AtmrneyHill, Sherman, Meroni, Gross & Simpson tube by a series of integrally formed leg members. The collar portion has a series of integrally formed springlike tabs which project radially inwardly of the retainer to center the yoke within the ring. The tablike spring members hold the yoke firmly in directions transverse to the axis of the retainer, while permitting free movement of the yoke in the axial direction. A series of flanges are provided at the leg side of the collar por tion to confine the yoke within the retaining device. Each of the flanges has a guide rib associated therewith extending in the axial direction at spaced points along the inner surface of the collar portion. These ribs prevent substantial pivoting of the yoke as it is being positioned within the yoke retainer.

1] Claims, 4 Drawing Figures YOKE-RETAINING DEVICE BACKGROUND OF THE INVENTION l. Description of the Prior Art Various means have been devised for properly positioning a deflection yoke of a television receiver about the gun portion of the cathode-ray tube. It is important that means be provided for properly positioning the yoke and retaining the yoke in a fixed position once the proper position has been determined. The most common retaining devices utilized in television receivers involve the use of a metal ring which is secured to the forward end of the cathode-ray tube by a series of springs. The yoke is then secured to the metal ring by using a bolt or clamp-type fixture which tightens about the yoke and therefore holds the yoke firmly in place. Such arrangements, however, are difficult to handle and inconsistent with today's trend to reduce the cost of television receivers and especially of color television receivers. In addition, the removal of the yoke from such prior art retaining devices is difficult, and the yoke must be reset in the proper position each time it is removed and reassembled.

2. Field of the Invention The field of art to which this invention pertains is retaining devices for deflection yokes of television receivers and in particular to retaining devices for permanently positioning the yoke about the gun portion of a cathode-ray tube while allowing easy removal and reassembly of the yoke SUMMARY OF THE INVENTION It is an important feature of the present invention to provide a new improved and less costly yoke retaining device for a cathode-ray tube.

It is another feature of the present invention to provide a one-piece molded yoke structure.

It is a principal object of the present invention to provide a yoke retainer which can be permanently positioned about the gun portion of a cathode-ray tube and act as a centering means and a supporting means for a deflection yoke.

It is another object of the present invention to provide a plasticlike yoke retainer which has a series of integral tablike spring projections extending radially inwardly of the retainer to provide a permanent centering means for the deflection yoke.

It is another object of the present invention to provide a molded plastic yoke container having a collar portion and a series of leg members extending generally axially away from the collar portion wherein the leg members have contacting surfaces which are shaped generally to conform to the mating surface of the cathode-ray tube.

It is also an object of the present invention to provide a molded yoke retainer as described above wherein the retainer is secured to the associated wall of the cathode-ray tube by pressure-sensitive tape means.

It is another object of the present invention to provide a molded plastic yoke retainer as described above wherein the inner surface of the collar portion of the yoke retainer has guide ribs extending generally axially of the collar portion and terminating in flanges which act as stops for the positioning of the yoke within the retainer.

These and other objects, features and advantages of the present invention will be understood in greater detail from the following description and the associated drawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a top elevational view of the yoke retaining means of the present invention.

FIG. 2 is a side view of the yoke-retaining means shown in FIG. 1 and having a portion thereof cut away to illustrate the configuration of the interior parts of the retainer.

FIG. 3 illustrates the orientation of a deflection yoke assembly and the yoke retainer just prior to placing the yoke within the yoke retainer.

FIG. 4 shows the method of positioning a yoke retainer about the gun portion of a cathode-ray tuber DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention pertains to a yoke-retaining device for a television receiver and in particular to a one-piece molded yoke retainer which effectively positions a yoke about the gun portion of a cathode ray tube. The yoke of the present invention comprises a collar portion and a series of pad foot portions which support the retainer and the yoke firmly against the rear envelope of the cathode-ray tube. The collar portion has a number of integrally formed springlike tabs which extend radially inwardly of the collar portion to coact with the outer surface of the yoke when it is slid into position within the collar portion of the retainer.

The collar portion also has a series of flanges formed at the foot side thereof which act as stops to limit the axial movement of the yoke as it is being positioned within the yoke retainer. These limit stops also have a series of guide ribs associated therewith. The guide ribs extend axially of the flange stops along the inner surface of the collar portion and serve to prevent pivotal motions of the yoke as it is slid into the retainer and thereby assure that the yoke will be held in posi tion against the flange stops and not pass directly through the collar portion which would otherwise be possible.

The springlike tabs consist of U-shaped fingers supported on the collar portion of the retainer and are sufficiently resilient to deflect when the yoke is slid into the collar portion of the retainer.

The retainer itself is mounted to the rear envelope of the cathode-ray tube by double-sided pressure-sensitive adhesive which is positioned between each of the pad foot portions of the retainer and the mating surface of the picture tube envelope. Through such an arrangement as described above, a yoke may be initially positioned in the retainer with the retainer fixedly secured to the picture tube envelope in such a way that the yoke may be then easily removed from the retainer and repositioned without the necessity of resetting the position of the yoke about the neck portion of the tube.

Referring to the drawings in greater detail, FIG. 1 shows the plastic molded yoke retainer 10. The side view of the retainer 10 is shown in FIG. 2.

The retainer [0 has a collar portion II which essentially is a ring of plasticlike material. The collar portion II has integrally formed foot portions l2, l3, l4 and [5 which extend generally in an axial direction away from the collar portion. The foot portions 12 through 15 are used to mount the retainer [0 to the associated wall ofa cathode-ray tube. In this regard, the foot portions such as the foot portion I2 has a surface to which is shaped generally to conform to the configuration of the mating part of the cathoderay tube. By placing a double-sided pressuresensitive adhesive tape such as the tape I7 against the mating surfaces of the foot portions 12 through IS. the ring can be rigidly fastened to the backwall of the pic ture tube simply by slipping the retainer ring over the neck portion and applying pressure to the retainer against the backwall of the cathode-ray tube. Once the retainer is positioned against the backwall of the tube, it is essentially unremovable.

It is not necessary, however, to remove the retainer ring from the backwall of the picture tube after it has been properly positioned. This is because the retainer, itself, has a series of tablike resilient members which are used to removably position the deflection yoke within the retainer ring. Therefore, while the retainer ring is permanently positioned about the neck of the tube, the yoke itself can be readily removed from the retainer ring and repositioned without difficulty.

The resilient tablike members such as the member [8 comprise a U-shaped projection having one leg 22 of the U formed integrally with the collar portion ll of the retainer. The other leg 23 of the U projects radially inwardly of the retainer ring in a cantilever fashion. The leg 23 is sufficiently resilient so that it will deflect as a yoke is slid into the retainer.

By positioning a number of the resilient members 18 through 2] circumferentially about the collar portion II, a deflection yoke may be resiliently retained and centered within the yoke retainer 10. Also, the yoke may be readily removed and repositioned easily.

The collar portion ll is also provided with a series of

flanges

24, 25, 26 and 27. The flanges 24 through 27 are located intermediate adjacent ones of the resilient tabs 18 through 21. As the yoke is slid into the collar portion ll of the retaining ring, the outermost edge of the yoke contacts the flanges 24 through 27, and this prevents further forward movement of the yoke relative to the retainer 10.

Each of the flange stops 24 through 27 are provided with

guide ribs

28, 29, 30 and 3] which extend generally axially of the retainer ring. These guide ribs tend to prevent pivotal motion of the deflection yoke as it is being inserted in the retainer. Therefore, these ribs assist in assuring that the yoke will contact the flange stops 24 through 27 squarely and not at an angle which might allow the deflection yoke to pass directly through the retainer ring.

FIGS. 3 and 4 show the method of assembling the yoke into the retainer ring and also show the method of mounting the retainer onto the gun portion or neck of a cathode-ray tube.

A standard deflection yoke 32 which includes an assembly 33 for holding a number of circuit elements and a cone-shaped coil support 34. The coil support 34 has an outwardly projecting rim 35 which is receivable within the collar ll of the yoke retainer 10.

The outer perimeter 36 of the portion 35 is slid into the yoke retainer 10 so that the face portion 37 thereof contacts the flanges 2S and 26. The

flanges

25 and 26 stop the forward movement of the deflection yoke, and the resilient tabs 18 through 2! firmly hold the yoke in position in the direction transverse to the axis of the collar ll.

in positioning the yoke within the retainer, the perimeter 36 is guided into position by the guide ribs 28 through 31.

Once the yoke 32 has been positioned properly within the yoke retainer 10, the yoke retainer 10 is then ready to be permanently set into position about the neck of the picture tube. This is accomplished as shown in FIG. 4. In FIG. 4, an assembly of the yoke retainer 10 and the yoke 32 is shown in two positions, namely the initial position 38 prior to sliding the as' sembly onto the neck of the picture tube and the final assembled position 39.

The foot portions such as the foot portions 16 and [7 have a pressure-sensitive adhesive applied thereto which permanently bonds the yoke retainer to the backwall of the picture tube. This is done by sliding the entire assembly with the deflection yoke in place in the retainer onto the neck of the picture tube. The deflection yoke and retainer are then positioned properly immediately adjacent to and spaced from the backwall of the picture tube. When the yoke is found to be in the upper position, then pressure is applied to the yoke retainer which permanently bonds the foot portions through the adhesive to the backwall of the picture tube. Thereafter, the yoke 32 may be removed from the yoke retainer at will without disturbing the position of the yoke retainer at the backwall of the picture tube. When it is desired to lock the yoke in position, a clamp 40 having a bolt 41 is tightened to crimp a plurality of fingers 42 about the neck 43 of the picture tube 44. The front end of the yoke is firmly positioned by the resilient tabs 18 through 21 of the yoke retainer, and the yoke is locked into position by the clamp mechanism 40 and 4].

lclaim: l. A device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising;

a retalner ring having a plurality of resilient yoke-centering means spaced circumferentially thereabout for positioning a yoke internally of the ring, and means for securing the retainer ring about the gun portion of a cathode-ray tube, said resilient yoke-centering means being secured to a wall of the ring and protruding radially inwardly thereof to coact with the deflection yoke for centering the same,

said deflection yoke being readily removably positionable within said ring against said resilient yoke-centering means.

2. A device for positioning a deflection yoke in accordance with claim I wherein said resilient yoke-centering means is formed integrally with said retainer ring.

3. A device for positioning a deflection yoke in accordance with claim 2 wherein said retainer ring has leg portions having surfaces shaped generally to conform to the mating surface areas of the cathode-ray 4. A device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising:

a retainer ring formed of a thermoplastic substance and having a plurality of integral resilient portions extending radially inwardly of the ring for positioning a yoke therein,

said resilient portions being deflectable upon insertion of a yoke within the ring and supporting the yoke in a fixed position relative to the ring axis, while permitting free axial motion of the yoke.

5. A device for positioning a deflection yoke in accordance with claim 4 wherein said retainer ring is provided with pad foot portions for securing the ring to the cathode-ray tube and wherein double'sided adhesive tape is secured to the pad foot portions for mounting the ring to the cathode-ray tube.

6. A device for positioning a deflection yoke in accordance with claim 5 wherein said integral resilient portions comprise cantilever-type tabs extending in a direction generally toward said pad foot portions and being angled radially inwardly toward the axis of said retainer ring.

7. A one-piece device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising:

a molded support formed of a plasticlike material,

said support having a collar portion and a number oflegs ex tending axially away from the collar portion,

said legs each having an inner contact portion angled relative to the axis of the ring to conform generally to a mating surface of the cathoderay tube,

said collar portion having resilient tabs extending inwardly of the inner surface of the collar portion to coact with a deflection yoke for positioning the yoke about the gun portion of said cathode-ray tube.

8. A one-piece device for positioning a deflection yoke in accordance with claim 7 wherein said resilient labs are aligned radially with the legs and provide firm support means transversely of the axis ofthe ring.

9. A one-piece device for positioning a deflection yoke in accordance with claim 8 wherein said resilient tabs are generally U-shaped with one leg of the U being integrally formed with the collar portion and the other leg of the U being a free end extending generally toward said legs.

10. A one-piece device for positioning a deflection yoke in accordance with claim 7 wherein the inner surface of said collar portion has a series of guide ribs formed generally axially thereof to guide a yoke into position within the retainer and prevent pivoting of the yoke therein.

11. A one-piece device for positioning a deflection yoke in accordance with claim 10 wherein flange stops are provided at the leg side of the collar to limit the axial position of the deflection yoke.

f i t

Claims

1. A device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising: a retainer ring having a plurality of resilient yoke-centering means spaced circumferentially thereabout for positioning a yoke internally of the ring, and means for securing the retainer ring about the gun portion of a cathode-ray tube, said resilient yoke-centering means being secured to a wall of the ring and protruding radially inwardly thereof to coact with the deflection yoke for centering the same, said deflection yoke being readily removably positionable within said ring against said resilient yoke-centering means.

2. A device for positioning a deflection yoke in accordance with claim 1 wherein said resilient yoke-centering means is formed integrally with said retainer ring.

3. A device for positioning a deflection yoke in accordance with claim 2 wherein said retainer ring has leg portions having surfaces shaped generally to conform to the mating surface areas of the cathode-ray tube, and pressure-sensitive adhesive means secured to said surfaces of the leg portions to rigidly secure the retainer ring to the cathode-ray tube.

4. A device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising: a retainer ring formed of a thermoplastic substance and having a plurality of integral resilient portions extending radially inwardly of the ring for positioning a yoke therein, said resilient portions being deflectable upon insertion of a yoke within the ring and supporting the yoke in a fixed position relative to the ring axis, while permitting free axial motion of the yoke.

5. A device for positioning a deflection yoke in accordance with claim 4 wherein said retainer ring is provided with pad foot portions for securing the ring to the cathode-ray tube and wherein double-sided adhesive tape is secured to the pad foot portions for mounting the ring to the cathode-ray tube.

7. A one-piece device for positioning a deflection yoke about the gun portion of a cathode-ray tube comprising: a molded support formed of a plasticlike material, said support having a collar portion and a number of legs extending axially away from the collar portion, said legs each having an inner contact portion angled relative to the axis of the ring to conform generally to a mating surface of the cathode-ray tube, said collar portion having resilient tabs extending inwardly of the inner surface of the collar portion to coact with a deflection yoke for positioning the yoke about the gun portion of said cathode-ray tube.

8. A one-piece device for positioning a deflection yoke in accordance with claim 7 wherein said resilient tabs are aligned radially with the legs and provide firm support means transversely of the axis of the ring.