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Патент USA US2133789

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Oct. 18, 1938.
E. J. Pool.
Filed March 30, 1935
‘2 .IW/7202117022:
Patented Oct. 18, i938
' Esson J. Pool. Chicago, Ill., assignor to Cinch
Manufacturing Corporation, Chicago, lll., aY
corporation of Illinois
,Application March 30, 1935, Serial No. 13,915
1 claim; "(el. zzo-5s)
My invention aims to provide improvements‘in 'sufficient tension in the finger to enable it to bear
fastener means for securing a cover to radio boxes
and the like/ structures.
firmly against the wall of the box whereby suit
able electrical wiping contact may be had 'at all
times between the box and the cover, and, at the
In the drawing which illustrates preferred
I forms of my inventiont- i
same time, cause the cover to be pressed firmly
Figure l is a plan view of a metal radio set con
against the walls of the box, thereby securely at
tainer with cover attached;
Fig. 2 is a section taken on the line 2-2 of
F18- 1:
taching it to the box.
Referring now to the drawing, I have shown in
Figure 1 a metal box or cabinet having a cover I
and a container 2. The fastener member itself
may takeseveral forms, one of which is shown in `
Fig. 3 is a section taken on the line l-l'of
Fig. 2;
Fig. 4 is a section taken on the line 4-4 of
Fig. 2. There, I have provided a member made
in strip form, preferably of cold rolled steel, hav
Fig. 5 is a section showing another form of my `ring a base portion 3 which is substantially fiat
Fig. 2:
Fig. 6 is a section taken on the line 6-8 of
Fig. 5:
Fig. '1 is a section taken on the line 1-1 of
Fig. 5; and
and secured to the inner surface of the cover 2 by l5
means oi’ the rivets l, although I would prefer
that this attachment be by spot-welding, as
shown in Fig. 6.
Preferably the fastener member has a number
Fig. 8 is a section of a fastener member per se Aof spring fingers 5 extending downwardly and
taken from the side.
My invention relates especially to a metal box
and cover installation for housing an automobile
radio set and the like.
It is well known that an automobile radio set.
vin orderl toobtain clear radio performance, must
becompletely shielded from all outside interfer
outwardly from' the base 3. The member 5 has
a shoulder portion 6 for the purpose of bearing
upon the interior of the box side walls 1 thereby
pressing the ñange I of the cover 2 firmly against
the walls 1.
I have provided at the same time, as shown in
Fig. 2, a'spring finger 9 attached to the same base
portion 3 as the finger i but having a more pro
ences. One method is to install the set in a metal
box which is thoroughly grounded to the automo- ' nounced shoulder' formation II) than the finger 5,
30 bile body. This metal box, together with a de
the purpose ofwhich is to engage with a shoulder
tachable cover, must be of good conductive metal
material in order that there be a complete
grounding means surrounding the set while the
cover is on the box. I have provided in my in
35 vention, a fastening means for securely attaching
the cover to the box and which will, at the same
time, provide a good electrical wiping contact be
l tween the cover and the box.
' I have taken as a preferred embodiment of my
40 invention, although I do not wish to be limited
thereby, a fastener member made of cold rolled
steel material. I prefer this untempered mate-`
rial because, among other things, it is more
adaptable to be spot-welded to a supporting struc \
45 ture, such as a radio cabinet cover, than a high
carbon tempered steel. By spot-welding my
fastener member,. I am enabled to secure it more
quickly to a support, than would be the case if the
' fastener were attached by ordinary riveting
50 means, and it is notnecessary to have alignment
of the holes in the fastener means with the holes f
in the supporting structure.
portion I I bent from the side Wall 1, as is shown
in Fig. 4.
These fastener strips may be of any length and
comprise any combination of the two finger types
as may be desired. When the cover is placed in
position on the box and forced down, the wall 1
of the box engages the fingers 5, which are slanted
toward the sidewall, and forces thershoulders 6
away from the flange 8, thereby forcing the wall 1
against the flange 8. When Ythe cover is com 40
pletely closed the bent-in shoulder portion II of y
the side wall engages the shoulder portion I0 of
the spring finger 9 and the cover is thus securely
fastened in place.
'I'he spring fingers are provided with a rib
shaped portion I2 (Fig. 8) for the purpose of
stifiening the untempered steel so that 'suitable
spring tension may be maintained for the pur- '
poses described.
In Figs. 5, 6 and 7, I have shown a pin I3 pro
jecting from the side wall 1 and providing a means
vi‘or resting the ñanges 8 of the cover 2. 'I'his pin,
I have provided a rib-shaped formation on each or some other suitable means providing a shoul
. of the spring fingers of the fastener member for , der, is necessary when a curved plane is formed
55 the purpose of stiffening the spring ?nger to cause
by the extension of the cover base to form the
' cover ñanges as shown in Figs. 6 and 7, but the
ornamenting surface, fastening means for secur
pin or shoulder is usually unnecessary when the ' ing the cover to the box comprising strips of un
cover ñange extends at right angles to the cover i tempered steel of substantial length relative to
base, as shown in Figs. 3 and 4. In this construc
tion I have eliminated the rivets 4 of the previ
ously described construction to carry out my idea
of spot-welding the fasteners in place instead of
other more expensive and slower methods.
Spot-Welding- the fasteners to the boxes is par
10 ticularly important when it is desired to apply
baked enamel to the outer surface. It is desir
the length of the respective side walls, spot Welded
yto the inner surface of one of said portions with
no part thereof extending beyond the outer sur
face of such portion to present projections which
would impair said ornamenting surface, each of
said fastening means being provided with a series
of vindependently acting ñngers bearing against
the'other portion of said box under spring tension
able to have a neat i'lnish to the box and this can
be accomplished when the fasteners are spot
to hold it in tight electrical contact with a coop
welded better than when riveted.
box cooperate -to shield a radio set contained
While I have illustrated and described preferred
forms of my invention, I do not wish to be limited
thereby, asthe scope of my invention is best de
>iìned by the following- claim.
I claim;
In combination, a metal automobile radio box
20 vhaving
a body portion with upstanding side walls,
a cover portion for said box adapted to receive an
erating box portion whereby the portions of the
therein, and said fingers being formed with an
olîset rib pressed therein adjacent to the point of
attachment of the fastening means to lthe box
portion to stiiTen said fingers to increase the bear
ing tension of the fingers against the cooperating
box portions.
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