US2568631A

US2568631A - Focus coil support and control

Info

Publication number: US2568631A
Application number: US140870A
Authority: US
Inventors: John L Hoellerich
Original assignee: Admiral Corp
Current assignee: Admiral Corp
Priority date: 1950-01-27
Filing date: 1950-01-27
Publication date: 1951-09-18
Anticipated expiration: 1968-09-18

Description

P 1951 J. HOELLERICH 2,568,531

FOCUS COIL SUPPORT AND CONTROL Filed Jan. 27, 1950 INVENTOR. CI'ZAILEZY: 15 0671422101 39 1 a 16 v 17 J6 g g patented Sept. 18, 1951 John L. Hoellerich, Wilmette, Ill., assignor to Admiral Corporation, Chicago, 111., a corporation of Delaware Application J anuary 27, 1950, Serial No. 140,870 12 Claims. (01. 313-84) This invention relates to mechanisms for support of the coils commonly associated with the electron gun of a cathode ray tube, and means by which the coils are adapted to be positioned when moved for best operation of the cathode ray tube.

The invention comprehends, in addition, to means by which the deflection coils are adapted to be positioned for best cooperation with a cathode ray tube, means by which the position of the focus coil is adapted to be positioned; independently of the deflection coils, from a point exteriorly of the wall of a cabinet in which the cathode ray tube and coils are disposed, without danger of shock to a person by whom such an adjustment is made or danger to the person from fragments of glass in case of fracture of the tube.

In earlier mountings for the focus coils of cathode ray tubes, it was customary to support said tubes by means which included screw adjustments and springs for applying forces in opposite directions to casings in which the focus coils were mounted for regulating the positions thereof. This enabled the position of the raster on the screen to be adjusted. The main disadvantage of this manner of adjustment resided in the fact that a screw driver orwrench had to be used, which was not only slow but either required the use of a mirror, so that the person standing at the rear and making the adjustment could see which way the raster was being moved, or the services of a second person to inform the, person adjusting the focus coil of the results. Furthermore, this type of adjustment was exceedingly slow. Then very frequently, even after adjusting, the adjustment changed in time due to slippage f the springs. Too often, due to the use of the screws, the tube was broken off at the neck due to the pressure of the focus coil on the neck, which pressure could not be readily be determined d ue to the fact that it was being applied with screws.

Furthermore, it was possible to make these adjustments only after a rear cover of the cabinet, in which the cathode ray tube was mounted, was removed. And this could be responsible for se- Vere electrical shockto a person attempting such an adjustment, or from flying glass should the wall structure of the cathode ray tube become fractured.

In the present invention means is provided by which the focus coil is adapted to be effectively moved from the exterior of the cabinet without the necessity of gaining access to the interior thereof for e'if ecting this adjustment. Consequently, the hazardous risk of contact viii'tl'r high tension conductors and/0r highly" charged sin"- faces is avoided, and in addition, glass fragments, occasioned by possible breakage of the cathode ray tube, are confined within the cabinet.

Briefly, the invention contemplates us of extendable mechanism passing through an aperture in one of the walls, usually the rear wall, of a cabinet from the exterior of which manual forces are adapted to be communicated to the focus coil to adjust the same independently of the deflection coils, and means by which the deflection coils and focus coils are adapted to be collectively stationed with respect to the electron gun portion of a cathode ray tube, especially if said electron gun portion is out of alignment with the larger diametral portion of the tube. Furthermore, barrier means coupled to the extendable mechanism, is provided to exclude the hands of an attendant from entrance to the interior of the cabinet through an aperture through which the extendable mechanism is adapted to pass, and/or an electrically conductive instrument extended through said aperture regardless of theposition in which the extendable mechanism is stationed. 7 Other advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended. claims.

In the drawings: s Fig. 1 is a side elevational view of the invention;

Fig. 2 is a fragmentary transverse section taken on line 2-2 of Fig. l, a portion of the mechanism being broken away to reveal the structure of underlying parts; and Fig. 3 is a vertical section taken on line 3-3 of Fig. 1.

Throughout the drawings, wherein fort-he purpose of illustration, is shown one embodiment of the invention, the reference character l is used todenote a fragment of the top of a chassis for a kinetescope or a cathode ray tube installation such as as employed in a television receiving set. Chassis I is adapted to be mounted in a cabinet of which only a fragmentary portion of the rear wall 2 is shown. Although a cathode ray tube 3 having an elongated portion or neck 4, of uniform diameter, is indicated in association with other apparatus, later to be described, .it derives its support in a manner not shown. Theneck 4 embraces means by which a beam of electrons is projected from: right to left Fig. 1) and which is adapted to bereflected during it passage through the tube by deflection coils 5 supported 3 from a central portion or arch 1 of a yoke 8 for adjustment of the coils angularly and longitudinally of the neck 4 by means including a bolt 9. Provision for this adjustment further includes a slot II, in the arch 1, through which bolt 9 passes. The yoke 8 is supported by a bearing frame I2 comprising a pair of vertical standards I3 which are bolted to the chassis I. Upwardly thereof, the frame I2 is embraced by arms I4 and I6 which extend downward from the ends of the arch 1 and are releasably clamped to the upper ends of standards I3 by screws I1, threaded in said standards and in coaxial relationship to each other. Also, the screws I1 may have suitable washers 26 under their heads, if desired. At the left thereof, arms I4 and I6 are embraced by a pair of flanges I8 bent backward from an apertured grommet support I9 for support of a rubber grommet 2|, which bridges the ends of arms I4 and I6 to which flanges I8 may be rigidly secured in any convenient manner.

Means is provided to adjust the yoke 8 with respect to the standards I3. This is advisable since, owing to imperfections in manufacture of cathode ray tubes, the axis of the neck 4 may be inclined slightly from the axis of the larger portion thereof including the screen. Accordingly, the screws I1 provide a substantially horizontal axis about which yok 8 and the arms I4 and I6 are adapted to be swung until the axes of the coils substantially coincide with the axis of the neck. Once the arms I4 and I6 have been thus swung tocompensate for misalignment of neck 4 with the rest of tube 3, the yoke 8 is locked to the frame I2. This is affected by tightening a clamp screw 22 which is threaded in one of the standards I3 and passes through a slot 23, arcuate of the axes of screws I1.

The focus of the cathode ray tube 3 is adapted to be regulated by a focus coil 24. It is enclosed preferably by a metal casing 26 and pivotally coupled to the arms I4, and I6 of the yoke 8 by means including a gimbal ring 21. Ring 21 comprises a U-shaped member 28 and a strap member 29 bolted to the two ends of the U-shaped member. Centrally of both the top and bottom of casing 26, threaded studs 3i, in coaxial relationship with each other, are in vertical extension through the strap 29 and a central section 32, parallel to the strap, of the U-shaped member 28. The studs 3| bear nuts 33 adapted to clamp casing 26 to itssupports which operation may be improved by use of washers 34 and spring washers 36 under the nuts.

Since it is essential that the focus coil be orientable about the axis provided by the studs 3|, suflicient friction is afforded by the spring washers 36 to retain the focus coil in whatever position it is moved to without unduly resisting manual effort when altering the position of the focus coil. It is also essential that the focus coil be swingable about a horizontal axis which is provided by a pair of bushings 31 passing through continuations of the arms I4 and I6 and into abutment with parallel,

vertical sections

38 and 39 of the U-shaped member 28. The state of abutment of the bushings 31 with

sections

38 and 39 is provided by the clamping action of screws 4| passing freely through the bushings 31, and threaded in said

sections

38 and 39 assisted by lock washers 42. Additionally, resistance to motion of the focus coil 24 about its horizontal axis is also provided so that said coil will remain in whatever position it is stationed. To this end, the bushings 31 are provided with flanges 43 at their outer 4 ends which are spaced from the arms I4 and I5 but only slightly more than the thickness of spring washers 44 so that the washers 44 are maintained under deflection between flanges 43 and the arms I4 and IS.

The focus coil 24 is adapted to be rocked about its axes from a point exteriorly of the wall 2. In order that this may be carried out, a bracket 'member 46 is employed. It includes a lateral foot portion 41 which is rigidly secured in any convenient manner, to the casing 26 while in offset relationship to foot 41 is a cantilevered portion 48 in which a thumb screw 49 is threaded. The screw 49 is adapted to extend through any one of a series of slots 5I in a beam 52 so that the position of said beam is adapted to be altered, longitudinally thereof, with respect to the bracket 46. This is in order that one size of beam 52 may 'be used for several cabinets varying in size. Beam '52 is thereby adapted to extend far enough through an aperture 53, in the wall 2, to provide a handle portion 54 outside of the cabinet. As a precaution against rotation of the beam about screw 49, opposite edges of said beam are flanged as at 56 so as to embrace the opposed edges of the bracket at portion 48 thereof. The flanges 56 extend from the left extremity of the beam to the handle 54 which is of decreased width to a point well within the wall 2 whereat a pair of shoulders 51 are provided at the right hand end of flanges 56.

Particularly in cabinets for domestic television receiving sets, the backs thereof are closed by a removable wall such as the wall 2, usually of foraminous construction, to exclude the hands of persons liable to receive an electric shock from apparatus within the cabinet: Therefore, it is advisable or essential that the aperture 53 be closed without in any way hampering, the capacity of the handle 54 to be moved laterally for adjustment of the focus of the television receiver. Accordingly, the beam 52 extends through a barrier, shield or flat plate 58 of area and proportions of such a nature that, regardless of the position of that handle 54 is stationed in with respect to the edge of aperture 53, the barrier 58 will cover said aperture. The operation of maintaining the aperture 53 closed regardless of the position of beam 52 is further augmented'by a spring 59 in compression on the handle portion 54 between shoulders 51 and the shield 58. Due

to this construction, it would :be difiicult to even shock to a person.

If desired, a cotter Or pin 5| may be carried by the handle portion.54 to resist too ready removal of the plate 58 if and when the rear cover 2 is removed for servicing of the chassis. In operation, the handle 54 may be moved within the limits of the aperture 53, which movement is ample to allow the proper positioning of the raster on the screen. Since the limits of the aperture 53 restrict the movement of the control handle, and hence the angular movement of thefocus coil, there is substantially no chance of the neck of the tube being broken. Furthermora'because it is simple and quick to effect the adjustment,

it is even within the province of the unskilled to make the adjustment of the raster in a simple and easy manner. 7

While I have described my invention in an embodiment thereof, I am aware that numerous and extensive departures may be made therefrom.

without departing from the spirit or scope invention.

I claim:

1. The combination with a focus coil supported by a gimbal ring for operative association with a cathode ray tube within a cabinet having an aperture in one of the walls thereof, of an extension mechanism coupled to the focus coil by which said focus coil is adapted to be moved about its axes, adjustment means in connection with the extension mechanism to provide forpextension of said mechanism an operative distance through said aperture, and means in connection with said extension mechanism by which said aperture is adapted to be closed regardless of the extent to which said extension mechanism is moved about its axes.

2. The combination with a focus coil in operative association with a cathode ray tube within a cabinet having an aperture in one of the walls thereof, of a gimbal ring comprising a yoke and a strap to support the focus coil, separate means in connection with the yoke to provide one of the axesfor the ring, means engaged between said yoke and said strap to provide another of the axes for said ring, an extension mechanism cou-- pled to the focus coil by which said focus coil is adapted to be moved about its axes, adjustment means in connection with the extension mech-- anism to provide for extension of said mechanism an operative distance through said aperture and thereby provide for movement of the coil from the exterior of the cabinet and barrier means in connection with said extension mechanism by which said aperture is adapted to be closed regardless of the extent to which said extension mechanism is moved.

3. In a cabinet having a rear wall in which an aperture is disposed and within the cabinet is housed a television receiving set which includes a cathode ray tube with which is operatively associated a focus coil supported by a gimbal ring, the combination of, means including a bracket element coupled to the focus coil by means of which said coil is adapted to be swung about its axes from a point exteriorly of the cabinet, a beam element, one of said elements having at least one slot therein, a threaded member in extension from the other element through said slot to adjustably clamp said elements together thereby providing for operative extension of said beam element through the aperture, a planar member carried by said beam element, said planar memher being of area greater than the area of said aperture, a spring to urge said planar member against the cabinet wall at said aperture to close said aperture, said planar member being coupled to said beam element to provide for continued closing of said aperture regardless of the position to which said beam element is moved.

4. A mounting for a set of coils including a focusing coil and a pair of deflection coils adapted to operate a cathode ray tube having a neck with which the coils are in association comprising a stationary member, an annular mechanism providing support for said focusing coil, said annular mechanism also providing an axis about which said focusing coil is adapted to be rocked, a yoke member, said deflection coils being supported by said yoke member, first pivotal means to pivotally associate said yoke member with said stationary member, second pivotal means to pivotally associate said annular mechanism with said yoke member thereby providing a second axis in angularly spaced relationship to said first mentioned of my stages:

6 axis for the focusing coil, all the coils being adapted to be swung about said first pivotal means to be operatively positioned with respect to the neck of the cathode ray tube and locking means adjacent said first pivotal means to clamp said yoke member in the position to which it is moved.

5. A mounting fora set of coils including a focusing coil and a pair of deflection coils adapted to operate a cathode ray tube having a neck with which the coils are in association within a cabinet having an opening in one of the walls thereof comprising a stationary member, an annular mechanism providing support for said focusing coil, said annular mechanism also providing an axis about which said focusing coil is adapted to be rocked, a yoke member, said deflection coils being supported by said yoke member, first pivotal means to pivotally associate said yoke member with said stationary member, second pivotal means to pivotally associate said annular mechanism with said yoke member thereby providing a second axis in angularly spaced relationship to said first mentioned axis for the focusing coil, all the coils being adapted to be swung about said first pivotal means to be operatively positioned with respect to the neck of the cathode ray tube, locking means adjacent said first pivotal means to clamp said yoke member in the position in which it is moved to and extension mechanism coupled to said focusing coil and in extension through the opening, said focusing coil being adapted to be thereby swung about its axes from a point exteriorly of the cabinet when said yoke member is clamped to said stationary member.

6. A mounting for a set of coils including a focusing coil and a pair of deflection coils adapted to operate a cathode ray tube having a neck with which the coils are in association within a cabinet having an opening in one of the Walls thereof comprising a stationary member, an annular mechanism providing sup-port for said focusing coil, said annular mechanism also providing an axis about which said focusing coil is adapted to be rocked, a yoke member, said deflection coils being supported by said yoke member, first pivotal means to pivotally associate said yoke member with said stationary, member, second pivotal means to pivotally associate said annular mechanism with said yoke member thereby providing a second axis in angularly spaced relationship to said first mentioned axis for the focusing coil, all the coils being adapted to be swung about said first pivotal means to be operatively positioned with respect to the neck of the cathode ray tube, locking means adjacent said first pivotal means to clamp said yoke member in the position in which it is moved to, extension mechanism coupled to said focusing coil and in extension through the opening, said focusing coil being adapted to be thereby swung about its axes from a point exteriorly of the cabinet and barrier means coupled to said extension means, said barrier means being adapted to close said aperture in any position in which the extension mechanism is moved to.

'7. A mounting for a set of focus and deflection coils adapted to operate a cathode ray tube having a neck with which the coils are in association within a cabinet having an opening in one of the walls thereof comprising a stationary member, an annular mechanism providing support for a focus coil, said annular mechanism also providing an axis about which said focus coil is adapted to be rocked, a yoke member, the deflection coils being supported by said yoke member,

first pivotal means to pivotally associate said yoke member with said stationary member, second ivotal means to pivotally associate said annular mechanism with said yoke member thereby providing a second axis in angularly spaced relationship to said first mentioned axis for the focus coil, all the coils being adapted to be swung about said first pivotal means to be operatively positioned with respect to the neck of the cathode ray tube, locking means adjacent said first pivotal means to clamp said yoke member in the position in which it is moved to, extension mechanism including a first element coupled to said focus coil, a second element adapted to extend through the cabinet opening, a shield member coupled to the second element, clamping means to extendably secure said second element to said first element for extension of said second element through said opening, said shield member then being adapted to overlie said opening and resilient means coupled to said second element to bias said shield member into engagement with said cabinet wall at said opening thereby closing said opening, said second element providing exteriorly of said wall a handle by which the focus coil is adapted to be regulated.

8. A support for a focus coil for a pictur tube in a television receiver, including, a base support having portions disposed on opposite sides of the neck of the tube, a pair of arms pivotally connected to said support and extending alongside said neck, a gimbal ring carried between said arms and a focus coil carried by the gimbal ring, means connected to said focus coil for moving the same on its support.

9. A support for a focus coil for a picture tube in a, television receiver having a cabinet, including, a base support having portions disposed on opposite sides of the neck of the tube, a pair of arms pivotally connected to said support and extending alongside said neck, a gimbal ring carried between said arms and a focus coil carried by the gimbal ring, means connected to said focus coil extending through said opening in the wall of said cabinet for moving said coil, a closure member disposed on the means connected to the focus coil, and held in engagement with said cabinet wall and covering said opening at all times.

10. A mounting'for the deflection and focus coils of a cathode ray tube including a base member, ayoke member pivotally mounted on said base member, said deflection coils, being adjust- 8 ably mounted on said yoke member, locking means adapted to lock said yoke member in an adjusted position on said base member, and a gimbal ring pivotally mounted on said yoke member laterally displaced from said-deflection coils, said focus coil being v ivotally mounted in said ring on a pivot axis angularly displaced from the pivot axis between said ring and said yoke member.

11. A support for the deflection and focusing coils of a cathode ray tube comprising a base member, a support member adjustably mounted on said base member and adapted to be held in a plurality of adjusted positions, said deflection coils being mounted on said support member and a gimbal ring mounted on said support member adapted to hold said focusing coil in a universally adjustable relationship to said tube.

12. A support for the deflection and focusing coils of a cathode ray tube comprising a stationary base member having a pair of vertical arms, a support member pivotally mounted on said base member at a pivotal axis, one of said members being formed with at least one slot arcuate of said axis, screw means threaded into the other of said members extending through said slots to clamp said support member in an adjusted position on said base member, said deflection coils being adjustably mounted on 'said support member and a. gimbal ring mounted on said support member adapted to hold said focusing coil in a universally adjustable relationship to said tube.

JOHN L. HOELLERICH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,165,779 Blain July 11, 1939 2,234,720 De Tar Mar. 11, 1941 2,428,928 Cain Oct. 14, 1947 2,440,403 Jackson, Apr. 27, 1948 2,443,973 Asling June 22, 1948 e 2,471,154 Keim May 24, 1949 2,479,494 Jackson Aug. 16, 1949 2,521,061 Heisig Sept. 5, 1950 FOREIGN PATENTS Number Country Date 597,255 Great Britain Jan. 21, 1948