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Filed Dec. ll, 1943
3 Sheets-Sheet 2
. ¿/’ í/Ä
Nov. 26, 1946.
Filed Deo. lll, 1943
| l ìï.
E E,
3 Sheets-Sheet 3
Patented Nov. 26, 1946
Sven H. M. Dodington, Forest Hills, N. Y., as
signer to Federal Telephone and Radio Cor
poration, New York, N. Y., a corporation of
Application December 11, 1943, Serial No. 513,965
3 Claims.
(Cl. Z50-16)
The present invention relates to radio assem
blies anel more particularly to an assembly of
parts forming a radio transmitter, receiver or
vide means whereby any portion of a radio as
other similar apparatus.
It is highly desirable in manufacturing radio
equipment to make the assembly as compact as
sembly may be quickly and easily reached for in
spection or repair.
Other objects and advantages of the inven
tion will be apparent from the following detailed
description to be read in conjunction with the
possible. In fact there are numerous occasions
accompanying drawings, in which:
upon which the overall dimensions of the equip
Fig. 1 is a perspective view of a radio assembly
ment are strictly limited, as for example, on
in accordance with the present invention;
board airplanes or other Vehicles in which space l0
Fig. 1A is a sectional View of a portion of Fig. 1
is usually at a premium. However, these space
along the line indicated;
limitations, in making compactness a requisite,
Fig. 2 is a View of Fig. l showing several of the
raise a number of problems that require solution.
sub-chassis members separated from the as
These include (1) the design oi the assembly so
that the various units are physically segregated
in accordance with functional characteristics, for
example, respective parts of the detector, ampli
Fig. 1;
iier, power unit, etc. being grouped together;
Fig. 3 is a perspective view of a plug and socket
assembly designed for use with the structure of
Fig- 4 is a perspective view of a modification of
(2) overcoming the undesirable crowding of parts
Fig. 1 with the radio parts arranged to provide
and wiring resulting from the desire for com 20 for greater compactness; and
pactness; (3) ease and speed of assembly; (4)
Fig. 5 is a rear elevational view of a modifica
accessibility for prompt inspection and repair.
tion of the structure of Fig. 4 showing hinged
Other problems may be raised in specific in
sub-chassis members.
stances but the ones mentioned will serve as a
In Figs. l and 2 are shown a plurality of sub
broad illustration of the factors involved.
in conventional practice, a single chassis is
chassis members 8, iii, l2, I4 and I6. These sub
chassis members are preferably made of sheet
usually employed for large assembly jobs such as
metal by known cutting and stamping operations.
a transmitter or receiver.
Each member comprises a rectangular panel
having its edges flanged, as generally shown at
rI‘his procedure is
cumbersome and time consuming to the factory
workers because of the diiñculty involved in as
sembling and wiring thereon numerous parts in
compact arrangement. In addition to the diffi
culty of assembling the parts, the compaotness o-f
the assembly permits but one or possibly two per
8A, HBA, iÉA, iíiA and lEA, these side iianges
acting to stiffer. the panels and also to provide a
space in which small parts and wiring may be
disposed and shielded, as will be hereinafter
brought out. The side flanges of several of the
panels are secured together at the corners of the
sons to work on it at a time. Furthermore, such
panel by some preferred means such as welding,
compact assembly jobs render it exceedingly dif
this construction acting to add rigidity to the
ncult to repair and/or replace parts, since to re
move a particular member for repair or replace
ment, other parts and wiring must usually be
On both the top and bottom surfaces of sev
40 eral of the panels il, il), l2, I4 and IS are mounted
radio parts and wiring, generally indicated as I8
Accordingly the present invention has as one
in the drawings, to form a number of sub
of its principal objects the provision of a radio
assemblies. The sub-assembly on sub-chassis 8
assembly in which each of the above-mentioned
may comprise, for example, a pulse amplifier,
problems has been solved.
while the sub-assembly on sub-chassis IEI may
Another object of the invention is substantially
similarly comprise an intermediate frequency
to increase the amount of space available for
amplifier'. The functional radio parts shown, as
mounting the parts and equipment on a radio
well as their number and grouping, is merely
chassis the overall dimensions of which fall
given by way of illustration, as obviously other
within predetermined limits.
A further object of the invention is to provide 50 circuit units would necessitate other equipment.
ln general, however, it may be said that the tubes,
a chassis construction by which radio equipment
coils, transformers and other large radio parts
may be conveniently assembled in sub-assemblies
are preferably mounted on the top surface of the
according to function, and the sub-assemblies
sub-chassis members, while the smaller parts
then mounted together.
such as resistors, condensers and wiring are dis
y A still further object of the invention is to pro
posed on the bottom surface.
The bottom sur
face oi the sub-chassis members may be either
side'of these members, but, as illustrated in the
drawings, I refer to the portion of the member
lying bet Jeen the side iianges as the bottom
The above arrangement of parts is particu
similar to that described to both members I2
and I 6.
In order to provide means for grasping the as
sembly or carrying it from place to place, a pair
of handles 22 are provided. These handles 22
each have a pair of threaded openings 42 in the
portions thereof adjacent the panel l ‘5. This can
larly true oi the side sub-chassis members 8 and
best be seen by reference to Fig. 1A. A pair of
lil. On the other hand, member Hi has been
screws dii are respectively receivable in the two
illustrated as comprising a power unit, the par 10 side openings IDB, and these screws project
ticular requirements of which necessitate placing
through side openings 16B and into the threaded
certain oi the parts outside the enclosure formed
openings 132 in handle 22. By means of this con
by the members. However, this condition existsl
struction it will be seen that the handles 22 serve
only for this type of unit, and for other circuit
a double purpose, that is, they provide means for
portions the larger apparatus included therein 15 conveniently grasping the assembly and in addi
could be grouped on the inner surface of the
tion they provide means for additionally securing
sub-chassis lêl in a manner similar to that of the
together the sub-chassis members 8, lli and i6.
members S
lo. The sub-assembly on sub
Sub-chassis member lll is provided with two
chassis i5 comprises the control means for the
series or” bolts 223, as best shown in Fig. 2. One
assembly, these control means being generally 20 series of bolts 2d is aligned with openings EEC in
indicated at ‘Eil in the drawings.
flange lûA of member lû, and the other series
As above stated, the sub-assemblies may com
of bolts 2d is associated with three openings (not
prise certain deíinite stages of the radio appara
shown) in ñange 8A. Thus sub-chassis lll can
tus, such as a detector stage, ampliiier, etc., or
be brought up to the other members so that bolts
may comprise any radio parts that may be most 25 2li project through openings I @C and the cor
readily and conveniently associated together as
responding openings in flange 8A. Nuts 29 (Fig.
a unit. Each of these units or sub-assemblies
l) threadably engaging these bolts tend to se
may be assembled as hereinbefore stated by a dif
cure rigidly together members 8, Ill and lli.
ferent workman.
It will thus be seen that the whole assembly is
.A description will now be given. of the prin 30 now rigidly joined together as a unit. However,
ciple of assembling the sub-chassis members,
it will be clear that by removing the necessary
each of which has been provided, as above men
tioned, with radio parts and wiring as a sub-as
bolts or screws, any one of the sub-assemblies can
sembly. The required sub-assemblies which, in
be separated from the remaining units for in
spection or repair. In the embodiment of the
the present instance, are five in number, are po
sitioned in spaced-apart angular relationship as
employed to strengthen the assembly against
invention shown, a pair of cross braces 6o are
best shown for several of the members in Fig, 2.
twisting or distortion.
Sub-chassis member l2 is preferably disposed to
As hereinbefore stated, the larger parts and
lie in a substantially horizontal plane. Sub
circuit elements are positioned on the top sur
ohassis members S, lll, i4'. and IS are disposed in 40 face of the sub-chassis members. Thus, as
substantially vertical position adjacent the re
shown in Figs. l and 2, these elements such as
spective flanged edges IEA of the member l2.
tubes I8' project inwardly toward the center of
Although five sub-chassis -members have been
the box-like structure constituting the assembly
illustrated, it will be clear that either or both
so as to substantially ñll the enclosure. How
members i2 and la may be dispensed with, and 45 ever, it is intended that the sub-chassis members
also that another sub-chassis member, parallel
M and IS be of suiiicient width so that a space
to member l2, may be provided to form a com
will exist between the inwardly-projecting radio
pletely enclosed boX-like structure.
parts of the sub-assemblies mounted on sub
Each sub-chassis member is provided with
chassis members 8 and le. This is brought out
means for securing it in rigid relationship to its 50 in Fig. 1, in which a space exists between the two
adjoining sub-chassis members. This is accom
rows of tubes, thus permitting access to the lower
plished in the embodiment shown by a plurality
part of the interior of the structure. No radio
of screws and bolts respectively receivable in a
parts have been illustrated as being mounted on
plurality of openings formed in adjoining mem
sub-chassis member l2 in Figs. 1 and 2, but this
bers. For instance in Fig. 2 the sub-chassis 55 is solely because the particular- circuit illustrated
member lli is provided with a plurality ofvopen
in these figures does not require further parts in
ings in the flanges thereoi designated as lilB and
addition to those mounted on the remaining
llìC. In the panel portion of the member a series
members. However, it will be clearly understood
or" openings lill) are formed.
that if additional circuit portions are necessary,
`Still referring to this sub-chassis member lll, 60 the sub-chassis member l2 may be equipped with
it will be seen that when this member is brought
such parts in a manner similar to that described
into close relationship with the sub-chassis mem
for sub-chassis members 8 and l0.
ber l2, the openings lllD in member lil will line
The spaces formed by the flanged portions 3A
up with the openings l2D in the flanged portion
and ISA respectively of sub-chassis members il
l2A. It will also be seen that openings ESB in 65 and lll, including the lower surface of -the panel
the flanged portion H3A will line up with a series
portions of such members are designed to enclose
of openings ESB which are provided in the panel
the smaller radio parts and wiring, including
portion of sub-chassis member Iii. A plurality of
those elements which in radio constructions are
bolts 2li (Fig. l) are passed through openings
normally electrically connected or joined together
lllD and i213 to secure the panel portion of mem 70 by soldering or other similar means. Thus a
ber lil to the ‘flanged portion IZA of member I 2.
majority or" such connections in the subèassem
A bolt 2l similarly passes through the center
blies S, lli
accessible from the exterior
opening lilB into the center opening 15B of mem
of the assembly,
without the can
ber it to secure the iiange H3A to the panel I6.
Sub-chassis member 8 is secured in a manner 75 of the screws or in any other way separating the
various sub-chassis members themselves.
supported by member 32 are a plurality of plugs
hereinbefore stated, due to the nature of the power
E@ designed for respective engagement with the
unit illustrated as constituting sub-chassis mem
sockets 28 of support 2t. When the sub-chassis
member ill is brought against sub-chassis mem
ber l2, as hereinbefore described, the plugs and
ber lâ many of the larger parts of this sub»
assembly have been illustrated as extending out
wardly from the panel itself instead of inwardly
as is the case with the other chassis members just
described. However, as before stated, this is en
tirely due to the nature oi this particular circuit
portion, and
other circumstances the structure
shown in
l and 2
readily be changed to
have these elements extend toward the interior
of the assembly.
Sub-chassis member i3 comprises the control
portion of the assembly. The various dials and
other control elements, generally indicated at 2d.
must, of necessiti , be mounted so as to be capable
of actuation from the exterior of the unit, For
this reason any circuit connections between the
controls will be on the interior surface of member
l5. However, such circuit connections are readily
accessible through. the opening formed by the
various vertical sub-assemblies.
t has been stated that each of the sub-assem
blies is wired as a unit. Therefore, only one cable
or other connection is necessary between the
sockets will become respectively associated so as
to establish any desired connections between these
two sub-chassis members. Of course, similar plug
socket connections can be provided between
sub-chassis members 3 and l2, le. and l2 and lil
and i2. Thus no wiring oi any sort will be neces
sary when the various sub-chassis members are
assembled to form the complete structure.
In Fig. 4 is shown
alternative construction
by which the width of the total assembly can
be considerably diminished. This is accomplished
by vertically oîsetting the larger radio parts, such
tubes l-AEA and ltlB, so that they lie in planes
one above the other. Oppositely disposed to each
such plane of tubes or other apparatus are two
series or” openings M- and ¿lâ respectively cut out
of members 3 and le. Thus when the sub-chassis
members S and l5 are brought together, these
openings all and
permit access to be had to the
radio parts lâh and E3B so that replacement or
repair thereof can be made through these side
various submassemblies when the complete unit
openings in the assembly rather than through the
is assembled. One example of such a connec~
tion between the sub-assemblies is shown in Fig. ll
in which a cable ¿5S is shown extending from an
top as was the case in the structure of Figs. l
and 2 and at the same time permit proper ventila
opening in subchassis I/i to each of the sub-chassis
members 8 and lll through an opening in the panel
portion of the latter below the line to which the
flanged portion lZA is attached. In Fig. 2 an
opening lilE in member lil is shown to receive
this cable. le. similar opening exists in panel S1.
Further circuit connections may be made between the sub-chassis member l5 and one or more
tion. Due to the oíiset position or" the parts IBA
and lSB the two members 8 and l0 can be placed
much closer together than would otherwise be
the case. Ir” desired, the openings 44 and/or ¿l'e‘
can be formed as one large opening rather than
several small ones.
In Fig. 5 is shown an alternative form of con
struction in which the sub-chassis members 8 and
of the other sub-assemblies depending on the type
lll are hinged on the sub-chassis member l2 so
that such members il and it can be lowered into
of circuit employed.
Due to the fact that considerable heat is gen
parallel relationship with member I2 by rotation
radio apparatus now mounted on sub-chassis
t will be readily apparent from the foregoing
description that my invention makes it possible
about the hinges Eil. In this construction a U
erated as the result of tube operation and from
shaped opening 52 is provided in flanged portion
other circuit elements in most radio apparatus,
. to replace the upper opening H2B, and also a
a plurality of openings 62 are provided in members
small portion is cut out of the surface of member
S and lll so as to provide adequate ventilation for 45 lil adjacent thereto. Similar changes are made
the interior of the assembly.
in member
Thus by merely loosening one of
It is apparent that a structure such as has been
the screws lili, and without completely withdraw
described is usually well suited for use for circuits
ing such screw from the opening 42 of handle 22,
ray tube is utilized. It will be
the sub-chassis members 3 and Hl can be selec
clear that such a cathode ray tube (not shovm) 50 tively lowered to any angular position relative to
can be
assembly so that the
sub-chassis member l2, thereby permitting ready
the tube will be positioned approxi.
access to the interior of the assembly. If desired,
rnately at the point new occupied by dial ‘is of
the screws ‘le of Fig. 1A can be replaced by a
conical body of the tube will
pair of wing nuts 5s as shown in Fig. 5 to permit
55 easier operation or the securing means.
or in centrally
other words
rear of the The
members and
would surround this cathode
to ass noble and wire the numerous parts of a
ray tube, so that practically all the space within
radio transmitter, receiver, or other radio appa
the interior of the assembly would be utilized.
ratus, in sub-assemblies and to combine these
In Fig. 3 is shown a modification of the struc
sub-assemblies into a single unit. By this method
ture of Figs. 1
2 in which any necessary con
of assembling radio parts a large number of op
nections between the sub-chassis members are
era-tors may work on a single apparatus, one or
automatically made when such units are joined
more workers assembling the parts of each ~sub
together. This is accomplished by means of a 65 assembly. rl’his method also facilitates mass pro
number of plug and socket elements. On sub
duction of radio apparatus and insures better
chassis member l2 is secured. .a support 25, this
workmanship for compact devices, since the cum
support being rigidly held against the under
bersorneness of numerous parts closely associated
is largely avoided. Besides facilitating the man
screws 3S. Within and positioned by support 2E 70 uiacture oi this type of compact apparatus, my
are a plurality of sockets 23. Support
is re
invention enables the removal of sections of the
cessed as shown from the flanged portion l 2A.
apparatus for repair and replacement purposes
On the surface of sub-chassis member lli is posi
without disturbing adjacent parts other than dis
tioned another support 32 secured to the member
connecting the single cable or other connection
by means or a plurality of screws 38. Within and 75 to the section the removal of which is desired. In
surface o1" the member by means of a plurality of
the plug and socket modiñcation shown even this
latter step isl unnecessary.
It is apparent that the increase in surface
availabie for mounting the parts varies with the
in the objects of my invention, and. the accom
panying claims.
I claim: _
1. A radio assembly chassis in the form of a
number of sub-chassis members utilized, this
number being normally between three and six.
including a bottom wall, said bottom Wall and a
if the members are of the same dimensions, three
plurality of said side Walls each comprising a flat,
box like structure, having side and other` Walls
sub-chassis members together will provide about
ñanged, rectangular sub-chassis member, means
150%v more available space than a conventional
including the flanges for securing said members
having an area equal to one of the members.
together with the spaces included by the iianges
additional sub-chassis member employed, of
facing outward, radio parts mounted on the in
course, adds to this total.
side face of said members and radio parts and
It will also be seen that due to the upright na
wiring mounted on the outside thereof Within
ture of a majority of the sub-chassis members, it
said iiange spaces, all said radio parts and wir
is possible to change the Wiring connections or re 15 ing mounted on each said sub-chassis members
move any of the parts mounted on such members
Without turning the assembly on its side as would
constituting a substantially complete circuit unit.
2. An assembly chassis according to claim 1 in
be the case with conventional units that are
which ons wall of the box is constituted by a con
mounted on a horizontal base. This eliminates
any possibility of breakage or other damage to
the apparatus that might occur when the assem
trol panel and there is means for securing ñanged
portions or adjacent sub-channel members to said
bly is turned from its normal position.
While I have described above the principles
of my invention in connection with speciiic ap
paratus, and particular modiñcations thereof, it
is to be clearly understood that this description
made oniy by way of example and not as a lim
itation on the scope of my invention as set forth
3. An assembly chassis according to claim 1
wherein one wall of the box is constituted by a
control panel and the side sub-chassis members
adjacent to said panel are pivotally mounted to
the bottom wall member and means is provided
for locking them in ciosed position.
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