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Патент USA US3084227

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April 2, 1963.
J- P. FIORE ETAL
TELEVISION RECEI VER WITH SAFETY PLATE
3,084,217
AND MOUNT ING MEANS
Filed Aug
20 /8 /7
18 1960
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Patented Apr. 2, 1963
2
1
be expected, the additional processing required during the
3,684,217
manufacture of a laminated tube is reflected in its original
cost which is signi?cantly more than that of a convention
al picture tube. Moreover, the set owner is‘placed at a
doseph P. Flore, Chicago, and Carl J. Steinke, Des Plaines, 5 decided disadvantage, in an economic sense, when it is
lll., assignors to Zenith Radio Corporation, a corpora
realized that at such times as a new picture tube is re
ion of Delaware
quired, no part of the laminated tube is reusable by the
Filed Aug. 18, 196i), Ser. No. 50,492.
Insofar as the viewer is concerned, heis re
8 Saints. (Cl. 1.78-7.82)
TELEVISIGN RECEWER WITH SAFETY PLATE
AND MUUNTING MEANS
. consumer .
quired to duplicate his original investment whenever the
This invention relates in general to television receivers 10 picture tube fails.
and more particularly to an improved mounting arrange
It is therefore a general object of the invention to pro
ment for the television picture tube and its associated
vide a television receiver ,characterized ‘by an improved
safety plate.
mounting arrangement forthe cathode>rayrtube and its
A most important safety device required‘in'television
associated safety-window plate.’ a _
receivers today is the transparent safety plate or Window 15 It is ‘a principal vobject‘ of the invention to provide a
which is positioned immediately in front of thedisplay
‘mounting arrangement for the safetyplate of a television
panel of the television picture tube for the purpose of pro
’ receiver which readily permits the window to withstand
the destructive forces accompanying a cathode-ray tube
tecting the viewer in the event of a tube implosion, While
a variety of arrangements for mounting this plate-are
implosion.
,
.
utilized, common practice is to employ a support which 20
It is a further object ofthe invention to provide a novel
mounting arrangement for yieldably suspending the safety
peripherally anchors or ?xes the safety plate. Aswill- bev
shown, this practice can contribute to safety plate failure
should the tube implode.
In order to more fully appreciate the problem presented
window of a television receiver.
,
"It is also an object of the invention to provide a cathode
ray tube-safety window assembly which-effects substan—
by a tube implosion, the suspected sequence of events will 25 tial economies over prior art arrangements.
‘
'bebriefly related. The implosion is generally initiated by
A television receiver constructed in accordance with
a crack or fault on the external surface of the highly evac~
the invention comprises a cathode-ray tube'having a dis
uated tube envelope. Since substantial portions of this
“ play paneland a member‘disposed in a'parallel relation
to the panel having a configuration which effectively
surface are under tension due to the force exerted by at
mospheric pressure, a multitude of additional ?ssures are 30 frames the panel. A transparent safety plate having an
instantly developed. As a result there is a more or less
area at least substantially ‘equate the frame area pro
complete mechanical break-up of the tube manifested in
vided by the aforesaid member is positioned'behind the
framin‘g member. Pneumatic cushioning‘ means com
part by a violent dispersion of glass particles. As a rule
the display panel is destroyed by forwardly directed parti
prising a gasket is interposed‘ between .the display panel
35
cles‘so that the safety plate is scored or scratched. It is,
of course, the purpose of this plate to intercept the flying
glass and con?ne the effect of the implosion to the televi
sion cabinet proper. However, in addition to this scoring
and the framing member to accommodate‘ relative move
ment of the plate and the tube in a direction toward one
another when the plate is subjected to a‘disturbing force.
“In a particular embodiment this ‘gasket is'provided with a
of the plate by the glass particles, there is an additional
first portion which de?nes a' channel that receives and
factor which must be considered, namely, the opposite"v 40 engages the plate about its perimeter in order to suspend
sides of the safety plate are now instantaneously subjected '
to a substantial pressure differential, a very low pressure
.on the inside and atmospheric pressure on the outside‘.
7' yieldably the plate in an. overlying relation to the display
‘panel and within the de?ned frame area, Thegasket is
_ further provided with a second portion which confronts
the display panel and-is ‘deformable ‘to the peripheral sur
As a result‘ the plate is driven toward the tube under the
impetus of atmospheric pressure. Since the edgeof‘the
safety plate is constrained about its periphery, the plate
,
tends to bow inwardly subjecting the inner surface of the
plateto tension forces. At this instant the plate is readily
susceptible to failure because of the inability of the
scratched inner surface to withstand the tension forces.
resently known solutions to such plate failure problems
contemplate in general the use of tempered glass or resort
face thereof and de?nes,ywith thefirst portion of the gas
ket, the cushion. section which is yieldable to accommo
date relative movement of the plate and the tube. ‘Finally,
means are provided ‘for norm-ally ?xing the tube, the frame
member and the gasket against relative movement.
The features of this invention which are believed to-be
novel are set forth with particularity in the appended
claims.
The invention, together with further objects
is heavier plate, both rather expensive expedients.
and advantages thereof, may best be understood, how
In this same area, it is also known to employ a rubber
ever,
by reference to the following’ description vtaken in
.ring between the safety plate and the display panel. of the 55 conjunction with the accompanying drawings, in the
several ?gures of which like reference numerals identify
tube in order to effect a dust seal therebetween. It should
be remembered that a seal of this nature will tend to main—
like elements, and in which:
tain an even greater pressure differential on opposite sides
of the safety plate should the tube implode. :In spite of 60
the fact that the rubber material provides a measure of
resiliency between the plate and the tube, such. mounting
arrangements for the safety plate have been characteristic
of prior art practices in that they fixedly restrain the
peripheral edge of the plate.
65
FIGURE '1 is a‘ plan view, partly in section, of a
television receiver embodying the invention;
FIGURE 2 shows a cross section of the gasket em
ployed for suspending the'safety plate in the television
receiver of FIGURE 1;
FIGURE 3 is a fragmentary view, partly in section,
With aview to dispensing with the prior art safety plate
illustrating the manner in which the gasketed safety plate
of the television receiveris suspended; and
as well as its mounting trappings, a laminated picture tube
has recently been introduced. This tube comprises a more
or less conventional picture tube to the front panel of
of a television receiver comprising an alternate embodi
.ment of the invention.
FIGURE 4 is an elevational view, partly in section,
which a bowl, conforming substantially to this panel- and 70 The television'receiver 10 shown in FIGUREI com
prises a chassis 11, a cabinet 12 fastened to the chassis
containing a quantity of transparent epoxy resin, is sealed
and a‘ cathode-ray picture tube 13 having- a display panel
to provide, in effect, a double-paned window. As would '
3,084,217
3
14 bounded by a peripheral portion 15. A framing mem
ber 16, which in the preferred embodiment comprises an
escutcheon, is disposed in a parallel relation to panel
14 and has acon?guration determined by. a radially ex
tending lip 17 which effectively frames the viewing area
of panel 14. As shown, escutcheon 15 is secured to
?anges 35 projecting inwardly from the walls of cabinet
port with well 18 facing upward. A gasketed safety plate
is then placed in the well with minor bulbous or cushion
portion 28 seated against the inner radius of the well.
Picture tube 13 is then positioned upon the principal
cushion portion 25 of the gasket. Thereafter harness
29 is mounted upon the funnel of tube 13 and straps 31
are securely fastened to bosses 32 of the escutcheon. As
fastener 33 is taken up, the picture tube is drawn toward
12 by conventional fasteners. Theescutcheon may also
be fastened to the chassis if additional‘ rigidity is re
the escutcheon so that the bulbous portion 25 of the
quired. The back wall of the escutcheon is relieved to 10 gasket tends to conform to periphery 15 of the face
panel while the minor bulbous portion 28 is partially com
form a well 18, the purpose of which will be explained
v‘shortly. A transparent glass safety plate 19, having an
area at least substantially equal to the frame area afforded
pressed to provide a yieldable barrier between safety plate
'19 and the escutcheon. As will be shown, this suspension
by escutcheon 16, is positioned behind the escutcheon.
arrangement permits safety plate 3.9, in effect, to “?oat”
Pneumatic cushioning means comprising a gasket 20
between escutcheon 16 and face panel 14 of the tube.
is interposed between display panel 14- and escutcheon 16
Furthermore, only the picture tube requires any type of
mounting hardware since the gasketing arrangement for
for the purpose of suspending safety plate 19 in an over
lying relation to panel 14 and within the frame area of
the safety plate renders unnecessary any separate facili
ties for mounting it in the receiver.
More particularly, {and as best shown in FIGURES 2 20 Accordingly, in the ‘event of a tube implosion, safety
and 3, gasket 29 comprises a ?rst portion'21 which de?nes
plate 19 by virtue of its “?oating” type mount is driven
a channel for receiving and engaging safety plate 19 about ,
bodily toward the tube by the force of atmospheric pres
its perimeter. Preferably this channel corresponds sub
sure bearing upon the outside surface of the plate. In
stantially to the outline or edge of the safety panel and
stantaneously, pneumatic cushion portion 25 of the gasket
includes a serrated inwardly extending outer section 23 25 yields to accommodate the inital inward displacement of
which positively grips and edge seals the outer surface
the plate. Then as the ‘plate continues inward the air en
‘of safety plate 19. The gasket includes a second portion
trapped within cushion 25 is further compressed to pro
24 which confronts display panel 14 and is conformable _
vide a progressively increasing retardation of the safety
to the peripheral surface 15 thereof. Portion 24 in con
plate. As a result the kinetic energy imparted to the plate
junction with portion 21 de?nes a principal bulbous sec
is dissipated and the possibility of safety plate failure is
tion 25 that constitutes, in effect, a pneumatic cushion
‘substantially eliminated. It is, of course, possible that the
which is yieldable to ‘accommodate relative movement
plate will rebound with some force. It is then a purpose
of plate 19 and tube 13 should either be displaced in
of cushion portion 28 to absorb any remaining energy in
a direction toward one another. A length 26 of portion
the plate in the same fashion as cushion 25. Now even if
24 which confronts panel 14 is likewise serrated in order
the seal formed at the junction of the gasket extremities
the escutcheon.
.
_
to insure positive gripping action as well as to contribute
to a substantially air-tight dust seal between safety plate
19 and display panel 14. The extremity Sil'of length 26
which joins channel 21 is cut back sharply so as to re
?eet light from the televised scene, as well as ambient
light, back toward display panel 14. This obviates an
otherwise undesirable ring of re?ection about the perim
eter of the televised scene.
'
is imperfect, the ability of the pneumatic cushion portions
‘to absorb the force of the implosion is but little affected.
This obtains because the displacement of the safety plate
during an implosion is substantially instantaneous in na
ture and the amount of air which could escape from an
‘imperfect seal during this time can have but slight effect
upon the cushioning.
Additionally, this novel gasketing arrangement affords
Preferably gasket 26 is additionally provided with a 7
a substantially air tight seal between the safety plate and
third portion 27 which confronts escutcheon 16 and is 45 the face panel of the tube, thus preventing the accumula
conformable to an inner peripheral surface of that mem
tion of dust and other foreign matter on the viewing screen
ber, more particularly, the inside radius of well 18. Por
‘of the picture tube. Furthermore, the expense of picture
tion 27 de?nes with portion 21 a minor bulbous section .
tube replacement is minimized since the safety plate as
28 likewise constituting a pneumatic cushion which is
yieldable to accommodate relative movement of plate 19 50
in a direction toward escutcheon 16.
This gasket may be constructed of butyl rubber or
other resilient material, however, it preferably comprises
an elongated strip of vinyl plastic cut to a length corre
sponding to the perimeter of safety plate 19 and end
sealed to form an endless collar which entraps a volume
of air in each of pneumatic cushion portions 25, 28.
While an air-tight seal is desirable at the junction of
the gasket extremities, as will be shown, the operating
efficiency of the gasket is but insigni?cantly affected by
an imperfect end-seal.
,
well as the gasket are, of course, reuseable.
The above-described embodiment contemplates a
mounting arrangement for ?xing the picture tube 13 and
gasket 20 against relative movement by securing the tube
to a support whichalso serves as an escutcheon for the
receiver. It is equally
the purview of the inven
tion to utilize the alternate embodiment of FIGURE 4
in which the support member 40 is employed in place of
vescutcheon 116. More particularly, member 40' comprises
a mask-like clamp having an aperture which effectively
frames display panel 14. The inner surface of member
40 conforms in general to the peripheral portion of dis
play panel 14 so as to de?ne an oval concavity 41. Mem
Means are provided for normally ?xing tube 13, es
ber 40 is also provided with a pair of support legs 42
cutcheon 16 and gasket 20 against relative movement.
(only one shown) which are bolted to chassis 11, an up
More particularly, such means comprise a ring-like
harness 29, which engages the funnel section 301 of picture 65 Vwardly extending ?ange 43 that is secured to the top wall
of cabinet 12 and a plurality of ears 44- to which harness
tube 13, and a plurality of straps 31 which are looped
straps 31 are secured. Gasketed safety plate 19 is snugly
around harness 29 and secured to bosses 32 extending
seated within concavity 41 intermediate clamp 40 and
rearwardly from escutcheon 16. The extremities of
picture tube 13 and retained therein by the same harness
harness 29 are retained by a bolt and nut fastening 33.
arrangement employed in the principal embodiment. A
Before discussing the manner in which the above~ 70 separate escutcheon 45 overlies support member 40 and is
described safety plate mounting arrangement reacts to
secured to the top and bottom walls of ‘cabinet 12. Es
a tube implosion, the method of assembling those com
,cutcheon 45 may comprise a molded plastic piece or an
ponents of the receiver, which are signi?cant insofar as
inexpensive stamping thus realizing a signi?cant saving in
the invention is concerned, will be briefly described.
cost. In all other respects the embodiment of FIGURE 4
First escutcheon 16 is positioned upon a suitable sup 75 is substantially identical to the principal embodiment of
3,084,217
5
FIGURE 1 and thus no additional description is deemed
necessary.
.
E5
tube and said gasketed safety plate to said support member‘.
4. A television receiver comprising: a cathode-ray tube
In summary, the subject invention provides ‘a novel
arrangement for securing a television picture tube andlits
having a display panel; an escutcheon disposed in aparallel
relation to said panel and having a con?guration to effec
associated safety plate within the receiver cabinet. Spe
ci?cally, the plate is retained by a gasket having a yield
able cushion portion adjacent the display panel of the
tively frame said panel; a transparent safety plate having
have been shown and described, it is apparent that changes
and modi?cations may be made therein without departing
from the invention in its broader aspects. The aim of the
appended claims, therefore, is to cover all such changes 15
engaging said plate about its perimeter, said gasket having
an area at least substantially equal to the frame area pro
vided by said escutcheon; means for yieldably suspending
said safety plate between said escutcheon and said dis
tube in order to accommodate movement of the plate in
play panel and comprising an endless gasket having a ?rst
the event the plate is displaced by the forces accompany
ing a tube implosion.
10 portion which de?nes a channel corresponding substan
tially to the outline of said safety plate for receiving and
While particular embodiments of the present invention
and modi?cations as fall within the true spirit and scope
of the invention.
We claim:
-1. A television receiver comprising: a cathode-ray tube
having a display panel; a member disposed in a parallel
relation to said panel and having a con?guration to effec
a second portion confronting said display panel and con
formable to the peripheral surface thereof and de?ning
with said ?rst portion-a chambered section yieldably ac
commodating movement of said safety plate relative to
and in the direction of said :display panel when said plate
is subjected to a disturbing force; and mounting means
embracing said tube for securing said tube to said es
cutcheon and for simultaneously ?xing said tube, said
escutcheon, and said gasket against relative movement.
tively frame said panel; a transparent safety plate having
5. A television receiver comprising: a cathode-ray tube
having a ‘display panel; an escutcheon disposed in -a paral
lel relation to said panel and having a con?guration to
vided by said member; means for yieldably suspending said
safety plate in overlying relation to said display panel and 25 effectively frame said panel; a transparent safety plate hav
ing an area at least substantially equal to the frame area
within the aforesaid frame area comprising a gasket hav
an area at least substantially equal to the frame area pro
ing a ?rst portion which de?nesa channel for receiving
and engaging said plate about its perimeter, said gasket
having a second portion confronting said display panel
provided by said escutcheon; means for yieldably suspend
ing said safety plate in overlying relation to said display
de?ning with said ?rst portion'a chambered section yield
ably accommodating relative movement of said plate and
responding substantially to the outline of said safety plate
for receiving and engaging said plate about its perimeter, a
second portion confronting said display panel and con
panel and within the aforesaid frame area comprising a
and conformable to the peripheral'isurface thereof and 30 gasket having a ?rst portion which de?nes a channel cor
said tube in a direction toward one another when said.
plate is subjected to a disturbing force; and means for nor
formable to the peripheral surface thereof and de?ning
mally ?xing said tube, said frame member, and said gasket 35 with said ?rst portion a principal chambered section yield
ably accommodating movement of said safety plate rela
against relative movement.
tive to and in the direction of said ‘display panel when said
plate is subjected to an initial disturbing force, said gasket
having a third portion confronting said escutcheon and
eifectively frame said panel; a transparent safety plate 40 conformable to the adjacent surface thereof and de?ning
2. A television receiver comprising: a cathode-ray tube
having a display panel; an escutcheon disposed in a paral
lel relation to said panel and having a con?guration to
having an area at least substantially equal to the frame
area provided by said escutcheon; means for yieldably
suspending said safety plate in overlying relation to said
with said ?rst portion a minor chambered section be
tween said plate and said escutcheon and yieldably accom
medating movement of said safety plate relative to and
in the direction of said escutcheon when said plate is sub
display panel and within the aforesaid frame area com
prising a gasket having a ?rst portion which de?nes a 45 jected to a second disturbing force; and means for nor
channel corresponding substantially to the outline of said
mally ?xing said tube, said escutcheon, and said gasket
safety plate for receiving and engaging said plate about its
perimeter, said gasket having a second portion confront
ing said display panel and conformable to the peripheral
surface thereof and de?ning with said ?rst portion a
against relative movement.
6. A television receiver comprising: a cathode-ray tube
having a display panel; a member disposed in a parallel
relation to said panel and having a con?guration to e?ec
chambered section yieldably accommodating relative
tively frame said panel; a transparent safety plate having
movement of said plate and said tube in a direction to
ward one another when said plate is subjected to a disturb~
an area at least substantially equal to the frame area pro
vided by said member; pneumatically yieldable cushion‘
ing means interposed between said display panel and said
ing force; and tube mounting means cooperating with said
escutcheon for normally ?xing said tube, and escutcheon, 55 framing member and yieldably accommodating relative
movement of said plate and said tube in a direction to
and said gasket against relative movement.
ward one another when said plate is subjected to a dis
3. A television receiver comprising: a cathode-ray tube
turbing force; and means for normally ?xing said tube,
having a display panel; a support member disposed in a
said framing member and said pneumatic cushioning
parallel relation to said panel and having ‘a con?guration
to effectively frame said panel; a transparent safety plate 60 means against relative movement.
7. A television receiver comprising: a cathode-ray tube
having an area at least substantially equal to the frame
having a display panel; a member disposed in ‘a parallel
area provided by said support member; means ‘for yield
relation to said panel and having a con?guration to effec
ably suspending said safety plate in overlying relation to
tively frame said panel; a transparent safety plate having
said display panel and within the aforesaid frame area
comprising a gasket having a ?rst portion which de?nes 65 an area at least substantially equal to the frame area pro
a channel corresponding substantially to the outline of
vided by said member; cushioning means for yieldably
said safety plate for receiving and engaging said plate
suspending said safety plate in overlying relation to said
about its perimeter, said gasket having a second portion
display panel and within the aforesaid frame area com
confronting said display panel and conformable to the pe
70 prising a gasket having a channel for receiving and en
ri-pheral surface thereof and de?ning with said ?rst por
gaging said plate about its perimeter and a pneumatically
tion a chambered section yieldably accommodating move
ment of said safety plate relative to and in the direction
of said display panel when said plate is subjected to a
yieldable portion confronting said display panel and yield
able to accommodate relative movement of said plate and
said tube in a direction toward one another when said
disturbing force; and mounting means for securing said 75 plate is subjected to a disturbing force; and means for
3,084,217
11'
8
normally ?xing said tube, said framing member and said
yieldably-accommodating movement of said safety plate
, '
relative to and in the direction of said member when said
8. A television receiver comprising: a cathode-ray tube
plate is subjectedto a second disturbing force; and means
having a display panel; a member disposed in a parallel
for normally ?xing said tube, said framing member, and
relation to said panel and having a con?guration to effec 5 said gasket against relative movement.
gasket against relative movement.
tively frame said panel; a transparent safety plate having
References Cited in the ?le of this patent
an area at least equal to the frame area provided by said
member; cushioning mens for yieldably suspending said
safety plate in overlying relation to said display panel
and Within the aforesaid frame ‘area comprising a gasket
having a channel for receiving and engaging said plate
about its perimeter, a ?rst pneumatically yieldable portion
,
ing movement of said safety plate relative to ‘and in the
to an initial disturbing force, and a second pneumatically
yieldable portion confronting said framing member and
UNITED STATES PATENTS
2,456,399
Gethmann __________ __ Dec. 14, 1948
2,497,660
Devine ______________ __ Feb. 14, 1950
. 2,559,353
Fisch ________ _.;_ ______ __ July 3, 1951
2,870,438
Solheirn _____________ -_ Jan. 20, 1959
' 2,936,448
lMarholz ____________ __ May 10, 1960
‘confronting said display panel and yieldably accommodat
direction of said display panel when said plate is subjected
I
15:
' ‘
FOREIGN PATENTS
938,734
Gemia'ny ___; _________ __ Feb. 9, 1956
214,649
A Australia ___________ __\_, Mar. 18, 1958
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