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March l5, 1949.
Filed Aug. 28.` 1943
24 I6 i262
. 8
Patented Mar. 15, 1949
Anthony Venditty, Detroit, Mich., assìgnor to
Thompson Products, Inc., Cleveland, Ohio, a
corporation of 0hio
Application August 28, 1943, Serial N0. 500,305
3 Claims. (Cl. 24-221)
This invention relates generally to fasteners
and, more particularly, to a self-locking fastener
ity of apertures therein which are so disposed
and formed that the remaining strip material
surrounding said apertures transmits a substan
tially equivalent stress to all portions of the strip
for detachably connecting a plurality of parts,
such as apertured plates, together.
More particularly, this invention relates to a
when in use.
Other objects and features of this invention Will
more fully appear from the following detail de
spring receptacle for a separable fastener em
bodying means for preventing unauthorized or
scription taken in connection with the accom
accidental detachment of the parts of the
panying drawings. which illustrate a single em
fastener and is particularly useful, therefore, in
detachably connecting inspection plates on air ll) cdiment thereof, and in which:
Figure 1 is a plan view of one form of separable
planes, airplane cowling, automotive paneling and
fastener in locked position showing it applied to
the like.
two coorer'ible plates which are illustrated a
An object of this invention is to provide an im
being broken away;
proved form of spring receptacle for such sep
Figure 2 is a sectional view taken along the
arable fasteners employed in detachably connect
line II-II of Figure 1 with the spring receptacle
ing a plurality of parts together and for retaining
and the stud partly in elevation and also differ
the parts in connected relation even though the
ing from Fieure 1 in that the stud is shown Ain
assembly is subjected to extreme Vibration nor
its unlocked position;
mally tending to disconnect the parts.
Figure 3 is a bottom view of the structure
Another object of the present invention is to 20
shown in Figure 1 illustrating the position of the
provide a resilient receptacle which will accom
screw driver slot in the stud when the stud is in
modate a stud or other like locking means which
its locked position;
will enable the fastener to be locked or unlocked
Figure 4 is a sectional view partly in elevation
upon a quarter turn or rotation of the stud or
locking means and which provides means for 25 similar to Figure 2 but showing the stud in its
locking position;
preventing unauthorized unlocking of the parts.
Figure 5 is a plan of the stamping from which
Still another object of the present invention
the spring receptacle is fabricated in flat form
is to provide a resilient receptacle of the above
prior to the bending of the fingers and the ends
mentioned type which is so designed as to pro
vide a greater proportion of the material for 30 of the stamping;
Figure 6 is an end view of the blank illustrated
those portions of the unit which receive the
in Figure 5, taken on the line VI-VI of Figure 5;
maximum stress and lesser material at points of
minimum stress so that the distribution of stress
Figure '7 is a vertical cross-sectional view, with
throughout the entire receptacle will be su-b
stantially uniform.
-parts omitted, taken substantially along the line
VII-VII of Figure 4.
Still another object of the present invention is
As shown on the drawings:
to provide a blank of sheet material of substan
The reference characters 8 and 9 designate gen
tially uniform thickness apertured to provide the
erally two parts or plates such as the cowling on
required engaging and lo-cking means for the
spring receptacle fabricated therefrom and so 40 an airplane, which are to be connected and locked
together as by means of my novel fastener. The
designed as to provide for the uniform distribu
upper plate 9 has supported on and fastened to
tion of stress throughout the article, so as to
it a resilient receptacle designated generally by
resist breakage at points of maximum stress and
the reference character I0. The resilient or
to increase the life of the parts fabricated there
45 spring receptacle l0 includes identical but oppo
sitely disposed spaced locking fingers or arms il
" A still further object of the present invention
and I I' which are co-operable with a central stud
relates to the provision of a novel form of spring
l2 which engages the lower plate 8. The spring
receptacle for a separable fastener which may
receptacle l0 is suitably secured, as for example,
be economically manufactured on a large produc
tion basis.
50 by rivets I3 to the surface of the upper plate 9.
The stud I2 includes a flanged base l5 having
¿'In accordance with the general features of
this 'invention there is provided, among other
thingsf'a blankv for the fabrication of a spring
receptacle comprising a strip of sheet material of
on its under surface a screw driver slot I6 by
means of which said stud l2 may be turned in `
either direction, depending upon whetherthe
substantially uniform thickness having a plural 56 stud` is being moved to locked or unlocked posi
tion with respect to» the resilient receptacle I0.
As will best ‘ce seen from Figures 2 and 4, the
stud it“ has extending upwardly from the base
tion 30 with an aperture 30a therethrough which
accommodates the rivet I3 employed in securing
the spring receptacle I0 to the plate 9. Interme
portion l5 a shank Il' having formed at its upper
end a substantially helical screw portion i8.
Adjacent the junction of the helical screw por
tion I8 and the shank Il of stud I2 are forni-ed
a pair of shoulders i9 which merge with the
curved surfaces of the helical screw portions I8,
thereby permitting the stud to be passed through
diate the ends of the blank IIJ is formed the elon
gated aperture 20 which accommodates the stud
I2 in the manner previously described.
An irregularly shaped opening 3l is provided
between each of the apertured ears 3U and the
centrally disposed elongated aperture 2û and
forms therewithin the longitudinally extending
the elongated aperture 2li disposed centrally of
arm l I. By virtue of the angularly disposed edges
the spring receptacle It] so as to disengage the
same when the stud is moved to a completely
unlocked position. When the stud is in its locked
position, as indicated in Figures 4 and 7, the
32 and 33 as indicated on the arms II, the open
ings 3I are rendered asymmetrical with respect
to their longitudinal axes. The notches 34 and
35 are formed in the edges of the blank Il] on
opposite sides of the elongated aperture 20 and
are also oppositely disposed with respect to the
transverse center line C-C, Figure 5, of the blank
shoulders I9 disposed diametrically opposite each
other overlap the portions 2i of the upper surface
of the spring receptacle Ill adjacent the elongated
aperture 20 and cause this portion of the recep
tacle to deflect slightly as indicated in Figure 4
thereby drawing the parts or plates 8 and 9
extending through the center of the elongated
into tight engagement.
It will be noted from Figures 2 and 4 of the
drawings that the shank Il of the stud l2 is
adapted to extend not only through the elongated
aperture 28 of the spring receptacle Iii but also
through apertures 22 and 23 in the plates I3 and
9' respectively. These apertures 22 and 23 are
aperture 20. These notches form localized nar
row portions 2 la in the portions 2 I.
In the formation of the spring receptacle l0
from the blank just described, the arms Il are
suitably curved upwardly over the surfaces 2| ad
jacent the elongated aperture 20 so that their
inclined diagonal edges 32 and 33 are arranged in
spaced relationship directly above the elongated
advantageously formed in the manner of a coun~
tersunk hole having associated therewith the pro
jecting collar portions 2&1 and 25 which define said
openings 22 and 23 of the plates 8 and 9, respec
tively. The collar portions 24 and 25 are adapted
to be disposed in concentric relation in order that
the former may be nested or located within the :i
latter so as to receive `the flanged base i5 of the
stud I2 which is adapted to register with the col
lar `portion 24 and to be flush with the under
surface of the plate 8.
Co~operating with the collar portions 2‘3 and
aperture ZI! as indicated in Figure 1, The ends of
the stamping are turned back under the surfaces
2| of the blank to provide the horizontally dis
posed U-shaped leg portions 36 for resiliently sup
porting the surfaces 2l of the spring receptacle
I6 in spaced relation to the surface of the plate
9 to which the receptacle is attached.
In addition to the engagement of the shoulders
I9 with respect to the surfaces 2i of the spring
receptacle Il! when the stud is in locked position,
the opposed surfaces of the helical screw portion
i8 of the stud I2 are adapted to engage the in
clined edges 32 and 33 of the arms I I. As will be
K seen from Figure 1, the engagement between the
25 to prevent the stud I2 from becoming disen
gaged-or falling out of the plate 3 when the stud
is moved to unlocked position, there may be pro~
vided in engagement with the upstanding edge of
collar portion 24 associated with the opening 22 -‘
in the plate 8, a grommet 2S. The grommet 2t is
of such size and shape as to engage the contigu
surfaces of the helically formed screw portion I8
and the inclined ends of the arms II and II' thus
prevents the stud from rotating after it has been
turned into its locked position. The stud I2 will
remain in the position indicated, being held there
by the inclined edges 32 and 33 of the arms II
ous surfaces of collar portions 24 and 25 and an
and I I ’ against the vibration or other operational
upwardly projecting annular bead 2l disposed on
shocks or jars resulting from the mechanism with
which the Cowling structure or other parts to be
secured are associated. The stud I2 is, however,
readily capable, upon the use of a suitable instru
the upper side of the flanged base i5 and en
circling the shank Il of the stud I2. The internal
diameter of the grommet >2'5 is such as to prevent
passage of the shoulders I 9 through the grommet.
ment such, for example, as a screw driver engag-
The stud I2 is thus held in place with respect to
ing the slot I5 in the base I5 of the stud, of being
theaperture 22 in the plate 8 and thereby pre
rotated out of contact with the arms I I and I I’ so
vented from falling out of said plate when it is
as to enable the stud I2 to be disengaged from
in unlocked position with respect to the spring
the spring receptacle Ill when desired.
receptacle I0.
Careful consideration has been given to the
The present invention is particularly concerned
design of the blank structure illustrated in Figure
with the formation of the blank and the spring 60 5 of the drawings. The speciñc shape and ar
receptacle l0 which is fabricated therefrom by a
rangement of the openings 3|, the notches 34
simple bending operation. The blank illustrated
together with the centrally disposed elon
in Figures 5 and 6 of the drawings, and indicated
gated aperture 26, have been found to provide
gener-ally by the reference character Ill, is shown
a highly satisfactorjy structural configuration.
in flattened` out form before being fabricated into (i5 The arrangement referred to provides additional
the springlreceptacle illustrated in Figures l, 2
bordering material in the blank at the points
and ‘lA and hereinbefore described.
where the stresses experienced in the spring re
The blank l0 comprises a metallic stamping
ceptacle fabricated therefrom are the greatest,
which is provided at its opposite ends with the
and a lesser amount of bordering material in
inwardly projecting arcuate indentations 29 70 those portions of the blank where the least
which serve to aid in locating the spring recep
tacle ID with respect to the upwardly projecting
collar portion 25 defining the aperture 23 in theY
plate 9. Adjacent the indentations ‘29 at each
end of the blank is formed an apertured ear por
amount of stress will be encountered.
The de~
sign is, therefore, particularly advantageous for
the> reason that spring receptacles fabricated from
such blanks are found to have a longer life and to
75 be capable of uniformly distributing throughout
stud extending through said aperture to hold
the stud against unauthorized rotation.
the entire spring receptacle the stress exerted
thereon by the operating engagement with the
2. A fastener spring receptacle for detachably
stud I2. Thus no part of the spring receptacle
fastening a plurality of parts together and
I0 receives more operational stress than any
adapted to provide throughout the unit a sub
uniform distribution of stress, said re
It will be noted that the portions 38 and 39
ceptacle having spaced mounting portions for
of the bordering material adajcent to the open
mounting the receptacle on at least one of the
ings 3l diiîer materially in their plane dimen
parts to be fastened together, locating means ad
sions. The portion 38 is, as will be seen from
Figure 1, the part of the blank I0 from which the 10 jacent said mounting portions for locating the
receptacle with respect to one ci the parts to
legs 36 are formed, being bent back under the
be fastened together, a depressable central por
portions 2| of said blank. These portions 38 must
tion having an elongated aperture disposed cen
of necessity be greater for the reason that they
trally thereof, notches disposed in the edges of
accept a greater proportion of the stress exerted
upon the spring receptacle l0 when in use. Con 15 the central portion for increasing the ñexibility
of the central portion and distributing any stress
trarily, the portions 39, while they may be stressed
introduced in the central portion uniformly
to a certain extent when the stud l2 is in locked
throughout said central portion, and a pair of
position due to the depressing of the portion 2l of
legs each having a bowed portion intermediate
the blank I0 when formed into the spring re
ceptacle, they do not, however, encounter the 20 its ends, said legs supporting each extremity of the
central portion from each of said mounting por
same degree of stress as that experienced by the
tions, said legs having greater width at their in
portions 38. In the same way, the notches 34
termediate bowed portions than at the extremities
and 35 are provided in the edges adjacent the
thereof dei-ined by the mounting portion and the
portions 2l of the blank I0 so as to provide por
tions of somewhat lesser cross-sectional area at 25 central portion for distributing the stress uni
formly from said central portion to said mounting
the points of lesser stress.
Obviously, spring receptacles employing other
3. A fastener receptacle adapted for coacting
with a fastener stud to detachably connect a plu
slightly diiîerent design, size and disposition of 30 rality of parts including a part having a collar
portion thereon, said receptacle having spaced
the openings, notches and apertures to provide a
opposed flat mounting portions with concave in
uniform stress throughout the unit. Any modi
ner ends adapted to straddle the collar portion, a
iications in structures may, therefore, be made to
pair of legs on the outer end of each mounting
correspond generally with the particular condi
forms of locking means which differ from that
of the stud I2 illustrated herein, will require a
portionl with each leg having a bowed portion in
termediate its ends, the legs of each pair being
spaced apart and each pair oi legs extending from
one of said flat portions to an apertured stud
receiving central portion adapted to overlie the
tions attendant upon the use of the spring re- `
ceptacle without, however, departing from the
spirit and scope of the present invention.
It will, of course, be understood that various
details of construction may be varied through a
wide range without departing from the principles 40 collared portion, arms extending from said cen
tral apertured portion between said spaced apart
of this invention and it is, therefore, not the pur
legs into overlying relation with said apertured
pose to limit the patent granted hereon otherwise
central portion and having opposed ends for co
than necessitated by the scope of the appended
acting with a stud passed through the apertured
central portion, and said receptacle being of uni
I claim as my invention:
form thickness throughout but having the por
1. In a fastener adapted for detachably con
tions thereof of varying width to distribute sub
necting a plurality of parts including a part hav
stantially equivalent stresses throughout all por
ing a collar portion thereon, the improvement
of a spring receptacle for a locking stud extending
through the parts, said receptacle having spaced 50
opposed mounting portions with concave inner
ends adapted to straddle the collar portion and
references are of record in the
having apertured ear portions extending laterally
ñle of this patent:
outward from said ends overlying the part and re
ceiving means for securing the spring receptacle 55
thereto, a pair of U-shaped legs extending up
wardly from each of said mounting portions in
Peterson ________ __ Dec. 28, 1915
spaced relation to the apertured portions and
merging with a central portion having an elon
gated stud-receiving aperature, said central por
tion having narrow portions adjacent diagonally
opposite corners of the aperture, said legs increas
ing in width from the extremities of the U adja
cent the mounting portion and the central portion
to the midpoint of the bight in the U, and a pair 65
of oppositel;7 bent arms each with an inclined
end overlying said elongated aperture adjacent
each end of the central portion for engaging a
Katzung ________ __ Feb. 24,
Greve ____________ __ Jan. 2,
Jones ____________ __ Aug. 6,
Reiter ____________ __ Dec. 20,
Boyer __________ -_ Sept. 26,
Purinton ________ __ Apr. 15,
Henry ____________ __ Nov. 4,
Henry __________ _.. Mar. 17,
Marchou ________ _- June 23,
Hulîerd __________ .__ Jan. 5,
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