US3051782A

US3051782A - Implosion panel spacing device

Info

Publication number: US3051782A
Application number: US826698A
Authority: US
Inventors: Anacleto D Giacchetti; Sheldon F Isenberg
Original assignee: National Video Corp
Current assignee: National Video Corp
Priority date: 1959-07-13
Filing date: 1959-07-13
Publication date: 1962-08-28
Anticipated expiration: 1979-08-28

Description

Aug. 1952 A. D. GIACCHETTI ETAI. 3,05L782 IMPLOSION PANEL SPACING DEVICE Filed July 13, 1959 INVENTORS Unite Filed July 13, 1959, Ser. No. 826,698

9 Claims. (Cl. 17s 7.s2

This invention relates to improvements in television picture tubes wherein the face of the picture tube is confronted by an implosion panel congruent therewith.

It will be understood that, heretofore, it has been the practice to employ a flat pane of sufficiently strong glass before the face of the picture tube in order to protect the observer from fiying fragments in the event of implosion. More recently, and in order to reduce the front to back dimension of the cabinet which houses the chassis, including the picture tube, there has been introduced a concave implosion panel arranged to nest with the convex face of the picture tube except for the interposition of a thin layer of transparent plastic composition, as will appear. By means of thi expedient the implosion panel may protrude beyond the front face of the cabinet which latter may be foreshortened correspondingly.

Inasmuch as the implosion panel is curved congruently with the tube face and is spaced therefrom by a thin layer of some suitable, transparent plastic, e.g. an epoxy resin, it is important that such spacing be maintained uniform over the coextensive areas of the panel and tube for otherwise errors of refraction give rise to undesirable distortion of the raster. Moreover, it has been found that if the thickness of the resin layer varies from point to point cracking thereof occurs. The present invention has for its principal object the provision of a spacing member particularly adapted to determine the necessary spacing between the panel and tube and to maintain such spacing.

A further object is to provide a spacing member as aforesaid which cooperates with the ears ordinarily forming part of the implosion panel and located at the four corners thereof.

Other objects are to provide a spacing member as aforesaid which is foolproof in installation, reliable during the life of the assembly of which it forms a part, is inexpensive and adaptable to variations in the curvature of the juxtaposed surfaces.

An additional object is to provide a spacing member as aforesaid which will not interfere with introduction of the fluid resin to the interspace.

In an alternative aspect We provide a combined spacing member and shoe adapted to fit over the ears of the panel to act as a cushion for clamping means by which the front end of the tube and the panel may be secured in position with respect to the front panel of the cabinet.

, Other objects and advantages will appear from the ensuing description which, taken with the accompanying drawing, discloses certain forms which the invention may be embodied in practice.

In this drawing:

FIG. 1 is a front elevational viewof the tube and implosion panel showing three of the invention devices in place, the remaining one being omitted for convenience of illustration;

FIG. 2 is a cross section taken on the line 2-2 of FIG. .1, but somewhat magnified;

3,5l,72 Patented Aug. 28, 1962 FIG. 3 is a detail in perspective of a preferred form of the invention;

FIG. 4 is a detail in perspective of a modified form of the device;

FIG. 5 is a cross section similar to FIG. 2, but showing the device of FIG. 4; and

FIG. 6 is a detail in perspective of still another modification.

Regarded broadly, the invention device comprises a spacing member of resilient material including a portion to embrace an ear of the implosion panel with which the device is assembled. In this connection it will be understood th-at the invention contemplates a form of implosion panel of substantially rectangular form having a laterally-extending car at each corner which, as a group, are designed to cooperate with clamps to fix the panel and tube in predetermined relation relative to the opening in the front panel of the cabinet through which the tube and panel protrude. The invention device therefore comprises a portion to be positioned over the ear for retention of the same in a defined spacing position together with a tab or tabs which extend between the confronting faces of the panel and tube. From the standpoint of economy of manufacture and assembly a onepiece device is preferred. Moreover, to obtain the desired pliability and shock-absorptive character the device is preferably of plastic composition, e.g. medium or high density polyethylene or nylon. However, rubber, both natural and artificial, fiber, hard felt or equivalent materials may be used. The tabs need only be long enough to provide the spacing since to make them too long may produce areas of interference with the raster. Inasmuch as the face of the tube is customarily rounded at its margins where it merges with the substantially frustopyramidal body of the tube the implosion panel is similarly curved. Accordingly, by employing flexible tabs the same may accommodate to such curvature. Obviously, in the event a relatively rigid tab is provided it may be pre-curved correspondingly. In the alternative aspect the portion of the device which fits over the ear is a cap or collar covering at least those surfaces of the car which receive clamping pressure and the spacing means are tabs extending therefrom.

Turning now to the drawing we have shown a television picture tube of conventional form having a front, convex face 10 of substantially rectangular contour to which is apposed an implosion panel 11 of corresponding contour which is returned about its periphery, as a skirt 12, congruently with the rounded forward corners or margins of the picture tube. At its four corners the panel is provided with integral ears 15 of generally parallelepipedic configuration against which clamps may be secured whereby the panel and tube are secured to the rear of the front panel 20 of the cabinet.

In order to obtain a listing of the combined tube and implosion panel with the Underwriters Laboratories, it is necessary to space the same some predetermined distance apart and to fill the space by flowing in a plastic composition 30 of refractive index equal to that of the glass. Thus, when the composition has solidified it serves to space permanently the two surfaces between which it is applied and, to the necessary extent, to cement the panel to the tube. Certain epoxy resins are found completely suitable for the foregoing purpose.

However, maintenance of the spacing of the two surspaced relation with the panel.

faces from the time the resin is poured therebetween, and

'has hardened presents a problem. Obviously spacers cannot be introduced into the viewing area. Our invention meets this requirement by interposing spacing elements at the more or less common margin of the tube face and panel and maintaining these elements accurately and reliably during such time as the resin is introduced and hardened. It will be understood that, during this process, the panel is laid horizontally on a proper support and the tube is positioned with its axis vertical and in necessary To this end we provide members 17, as best seen in FIG. 3 each of which comprises a strap portion 17 including a transverse element 17a and legs 17b defining an opening 18 to receive an associated car 15 whereby the member 17 is retained both laterally and in a fore-and-aft sense. The legs 17b continue adjacent the ear '15 to terminate in tabs 19 which may be comparatively rigid and conformed to the surfacesto be separated or flexible to be conformed =by juxtaposition of the tube and panel. In either case the thickness of the tabs will be such as to produce the desired spacing for reception of the resin lamina. It will be apparent that the device remains in place permanently due to the cementing action of the plastic in which the tabs are embedded, and that the tabs 19 are of a length calculated not to present opaque areas on the raster. Alternatively the tabs 19 may be a single tab centrally of the device.

In the event the implosion panel is not provided with the ears 15 the device may be received over the skirt of the implosion panel by a simple hooking engagement, without alteration in the basic configuration disclosed.

In the modification of FIG. 4 the ear-engaging portion is a rectangular cap 21 received snugly over the ear 15.

In this case a resilient material is more or less obligatory as the device is intended to act as a cushion to absorb pressure of clamps applied to the ears and for absorbing shock and vibration which might otherwise fracture the .glass. Thetabs 19a correspond in construction and function with the tabs 19 of FIG. 3.

As a further alternative FIGS. 5 and 6 illustrate a device in which the ear-engaging portion 23 is a collar pass- .ing snugly around the car functioning similarly to the portion 21 of FIGS. 4 and 5. It will be evident that the tabs 1% function as before. It will be noted that, in the embodiments of FIGS. 4 and 6, the ear-engaging portion of the device, if made of polyethylene or other elastic material, may be dimensioned to grip the ear whereby inadvertent dislodgment, as may occur during the process of uniting the tube and panel, is obviated.

Having in mind that the somewhat shorter radii of curvature of the marginal portions of the tube face and panel respectively (regarded-in a transverse aspect) are considerably less than the radii of the principal surfaces of the same, and, in order to accommodate the spacing tabs more ideally to these homologous marginal surfaces, the principal longitudinal axes of the pair of

tabs

19, 19a or 19b are converged to a point which is approximately the pole of the corners of the margins (regarded as an octant of a spherical surface).

While we have shown particular embodiments of our invention, it will be understood, of course, that 'we do not wish to be limited thereto since many modifications may be made and we, therefore, contemplate by'the appended claims to cover any such modifications as fall within the true spirit and scope of our invention.

;We claim:

1. In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same and having a predetermined spacing therefrom, said panel being provided with a peripheral flange, and a plurality of devices, each device comprising a portion engaging said flange and a spacing tab extending from said portion interposed between the confronting faces of the tube and panel, said tab being sandwiched between said confronting faces to maintain said predetermined spacing, and means precluding relative displacement between said tube and panel.

2. In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same and having a predetermined spacing therefrom, said panel being provided with a plurality of spaced apart ears extending from the periphery thereof, and a plurality of devices one individual to each ear, each device comprising a portion engaging its associated ear and a spacing tab extending from said portion interposed between the confronting faces of the tube and panel, said tab being sandwiched between said confronting faces to maintain said predetermined spacing, and means precluding relative displacement between said tube and panel.

3. The combination in accordance with claim 2 in which each said car has a forward face substantially parallel to the principal plane of the panel and opposite end faces, said ear-engaging portion is a strap passing around said forward face and the opposite end faces, and said tab forms a continuation of an end of the strap.

4. The combination in accordance with claim 2 wherein said ear-engaging portion and tab are integral.

5. In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same, and having a predetermined spacing therefrom, said panel being provided with a plurality of substantially parallelepipedic ears extending laterally from the periphery thereof, each said ear including a forward, principal face parallel to the principal plane of the panel and opposite end faces, and a plurality of devices one individual to each ear, each device comprising a portion overlying said forward face of its associated ear and a tab extending from each end of said overlying portion sandwiched between said confronting faces to maintain said predetermined spacing, and means precluding relative displacement of said tube and panel.

6. The combination in accordance with claim 5 further characterized by the provision of an extension at each end of said overlying portion adjacent said opposite end faces of the ear and each said tab is a continuation of a said extension. 7

7. In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same and having a predetermined spacing therefrom, said panel being provided with a plurality of substantially parallelepipedic ears extending laterally from the periphery thereof, a plurality of devices one individual to each ear, each de- .vice comprising a cap-shaped member embracing its associated ear to prevent dislodgment of the device therefrom, and 'a spacing tab extending from said member interposed between said confronting faces to maintain said predetermined spacing, and means precluding relative displacement between said tube and panel.

8. In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same and having a predetermined spacing therefrom, said panel being provided with a plurality of substantially parallelepipedic ears extending laterally from the periphery thereof, a plurality of devices one individual to each ear, each said device comprising a collar embracing the ear and a tab extending from said collar interposed between said confronting faces to maintain said predetermined spacing, and means precluding relative displacement between said tube and panel.

9 In combination a cathode ray tube having a front viewing face, an implosion panel substantially coextensive with said face, confronting the same and having a predetermined spacing therefrom, said tube face and panel at least in the marginal confronting areas of their respective faces being homologously convex and concave respectively, said panel having a plurality of ears extending lat- References Cited in the file of this patent erally fro n the periphery thereof, a plurality 9f devices UNITED STATES PATENTS one individual to each ear, each device comprising a portion engaging an associated ear and a spacing tab extend- 1,912,847 Klein} June 6, 1933 ing from said ear-engaging poition interposed between 5 2,091,152 MalPlca 1937 Said marginal areas to maintain said predetermined spac- 2497660 Dsvme 14, 1950 ing, said tab bein-g curved congruently with the homolo- 2,525,921 Madam 1950 gous curvature of said areas, and means precluding rela- 216540880 Elsenkramer 1953 2,716,231 Blayney Aug. 23, 1955 tive displacement between said tube and panel.