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Патент USA US2124249

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¿July 19, 193s. _
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Fiied_Aug'. 15, -1955
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Perera-¿July 19, 193s
f 2,124,249‘
liJN-rritp STATES .ini'i‘iarifi‘ll ori-‘ica `
_vëîâäîi‘iîtròn NUTS
Igino Guiduccl, Tl‘ivoli, Italy .
Application August 1s, i935, serioLNo. sacas
rultoiy october' 11, 1934 =
(ci. isi-_ain4
The present linvention relates to locking wash-
a relatively» gentle inclination slopinc in the
ers for nuts, and its object is to provide'a double
olOokWiBe dlreßiìion-t .
washer of simple and economical manufacture ’ From the annular portion I there extend ra
and‘at the same time one which is completely re- dially extensionsß, each o! which has a Portion'
`5 vliablein'operation and which' can he- used with- 3d rigidly attached .to and in the'lilßne of the 5
out _any previous preparation oiî4 the nut.
f .
annular portion i Oi'- the Wßßher. and another .
The doubie washer in accordance with theA4
invenfien'is'eomposed of two. equal or sußetentlally equal simple-washers, each having one tace
1o provided with projections adapted to engage the
portion 3b separated by a cutting from the said'
annular portion I and inclined downwards and .
bwkWardS When 4the Washer i8 Seen as shown in
Fie. 2 orFls. if» and turning in a clockwise direc- io .
part with which the washer co-ects during the
each washer has in ~addition radial extensions ‘so
Shown in F12. 1, i. e., with their _smooth faces '
tightening-up of the nut, and one smooth face;
shaped 'as to permit the relative angular~ 'move15' ment of the two washers in the direction in
ooeeting with eooh other» in Such e We? that the `
`eggl'egel'le formed-by two Washers hos the Pro" 15' i
which the nut is tightened up but not the move-
lemons 2 oo both the, external feoelt Whleh Pro' '
mem-„in the reverse ’dil-eenen' '
jections are intended to engage the nut and the
The' ‘ two washers are varranged with.` their
smooth faces in Contact with each „the-n
TWo Washers el'e used in eooi‘metlon'» “e ie ’
surface ofthe part t0 be kept tight
In practice the double -washer may be put on _.
' other characteristics end advantages of- the
the market Withthe twv 81118192 @moment ‘mh- 2°.
locking washer-'in accordance with the invention
ers joined. together by .means of on? adhesive
will become apparent'in the course of the pres-
the accompanying drawing, which represents by
washer' me» 1 Wm be considered ‘uppoeiog that
ent description which is made with reference to‘»
In order t0 understand the opereuon‘ of the
25 way of example two preferred embodiments of _the nut C is not Yet tightened up'
the invention.
In. the drawing:
_ _
30 ‘accordance
the invention. [y
«` f'
Fig.V 21s an elevation of a single washer.' .
Fig' 3 is a man view from above of the washer
. _
_ the two single washers A and B', arranged 'as has
Fig. 1 is en elevation or e boit provided with
the preferred embodiment of double washer in
.Shown-in Fig 2.
As it‘is shown, the double washer formed by
been already des'efibed» is thfeßdee on ille bolt
E heme the out is P‘“ °n- The“ the. out i’
Screwed @n and lipari', ñrstu turns freely. when,- 30
however’ the douwe Washer A' B' begins tó 'be '
pressed between the nut C and vthe part D. the
.points oi the projections 2 commence to -bite on
-Eig. 4 is an elegation of a nut and of a washer the suda-ces with which they are m Contact' and
35 of modined form, to beused'prererebiy with nuts l namely the P¥°leeu°ns 2 °f the Washer A We the 35
*of* hard Steel’ I
v- y
_ .
gaat#ve thlile'fnut
ace o
. of ' the washer
shîivä'! î-nislâglïlï'îl View from above of tn_'e -wvashîî
The washer B remains ilxed, while 'the washer
With‘ reference to Figs. 1‘ mp3, each simple » A is
by the of
C inextensions
its movement.
3 oi( 'do
f _40 washer comprises an .annular portion ’ I, whosev
i. e., the
is slightly
greg-¿teg than
the diameter
diameter ofof the
with Awhich the washer ' is to he used, whilst the
tions of the lower washer
in. such
a way that.I
“me permitting the' tightemng'up “meme” °f
Prevent the
45 -external vdiameter of the said annular part i is I gli
smaller than the diameter oi’ the circle .which is f It is obviou's that there
inscribed i“ the Outline of 'the nut'
The periphery ofthe annuler Portion 'le Pro'
vided with projections 2, extending. vertically
movememm the 0pm' 45
a pomüve locking be;
tween >the two washers in as many points of 4the »
circumference as there are extensions on each
eo relatively tothe Plane 0f the wher. cnd'prcfcr-' . 1n this connection it should he noted that the oo
ably 0fV triangular Shape with a Vertex Which iS -dimensions of- the extensions do not increase with5
asymmetrical. relatively t0 the. base 0i :the -tri-.Í the increase in'the diameter ci the nut. but-they
angle, in such a way that in each triangular pro-_
are maintained substantially the, same for all”
:lection there v_is a steep face 2a> sloping in a
sizes of nuts.
.55 counter-»clockwise direction and a i’acezb having
` f
with a small nut. ior example. there will be il.; i
employed four extensions' per washer, with a
ample necessary to make small recesses in the
slightly larger nut six extensions, with/one still
stationary part.
larger, for example, eight extensions and so on,
This does'not prevent the advantageous use in
the size of the extensions being kept practically
the case of emergency of Äonly one single washer_
in accordance with the invention by arranging
constant for all the nu _.
As these extensions 3 work in fact edgewise,
v'they can support ver_ big strains without being
Amongst the other advantages of the double
ywasher according 'to the invention, there is the
advantage that it is-not necessary for the washer
to be made of high quality steel, but it is suiil
cient for it to be made of a good constructional
locking washers that the tempering should be
With my Washers.
Once the points of the washer according' to the
20 invention have penetrated into uthe pieces with
' which they co-act, evendi' the washer softens
owing to its being in the neighbourhood of sources
of heat it will also maintain its grip.
On the contrary, _when other known types of
25 washers soften, they Vrelax and permit the nut
to loosen itself.
sions 3.
The type of washer shown in Figs. 4 and 5 is
employed for steel nuts of such a hardness. that 10
they cannot be notched by the projecting points
of the type of washer shown in Figs. 1 and 3. It
is to be noted, however, that this type of washer
‘ In addition, while it is essential with the known
very accurately carried out, this is not the case
it with the projections 2 towards the nut and
making on the fixed part D one or more recesses
for engaging the rear edge'of one or more exten
in accordance with Figs. 4'and 5 is employed for
the single nut, while the washer co-acting with 15
the part on which the nut has to be tightened is
of the type previously described.
In the form shown in Figs. 4 and 5, the annular
part l ' is of an external diameter which is greater
than the diameter of the cir'cle circumscribed to 20
the co-acting nut. 'I'he washer is provided with
the usual extensions 3 identical with those of the
washer which has been already described. 'I’he
sole diiïerence'ls that, in place of the upwardly
Another important advantage of the washer > turned points, there are provided'upwardly-fold- >
according to the invention is that the two single
Washers may be made from thin sheets even >for
30 large nuts, precisely because there is a good grip
on the part of the points, even when these- pene
trate to a slight extent, for example even to the
extent oi' h’alf a 'millimetro only, into the co-act
ing surface, and> there is also a very effective
35 interlocking » of the extensions for any strain
whatsoever, since the extensions work edgewise.
A still further advantage of the invention is
that, when the nut is tightened up, even an un
_skllled operator will be aware il’ _the double washer
is in good condition; in fact, in such a case, if
as to receive exactly between them the nut C.
'I'he nutC is therefore set fast between the por
tions 4, and when it is tightened up it takes the
washer with it in its movement. For the rem 30
nant the operation is exactly the same as has
been described for vthe embodiment shown in
Figs. 1 to 3.
What I claim is:
1. A locking device composed of two òppositely 35
disposed identical washers, each Washer including
an annular body. a series of spring tongues ex
tending circumferentially in one direction and
~ having the ends
thereof deflected laterally of
.the double washer can be seen its good Working
one face of the body, a series of biting teeth 40
order can be ascertained by the fact that tige projecting
from the opposite face of the body
washer which co-acts with the i’lxed part is t
rest, While the washer which co-acts with the
45 nut follows the movement ofv the nut itseli'.
If the washer. cannot be seen, its goodl working
order can be ascertained by the fact that small
successive sounds are~ perceived each time that
the inclined portions of the extensions of one
50 washer jump in the spaces between the exten
sions of the other Washer.
, 'I'he size oi’ the extensions in the direction per- -
" pendicular to the radius may be equal to that
of the space between two lsuccessive extensions,
Ul Til but it is preferable for the extension to be some»
what larger than the said space, so as to prevent
any interlocking of the two washers in the di‘
rection of the tightening-up of the nut.
ItY will be obvious to those skilled in the art
that the ,double washer according to the inven
tion can be used without any prior preparation
of the fixed part D, as is -necessary with other
known types of washers, with which it is for ex
and facing in the same circumferential direction
as said tongues, the tongues of one washer inter
locking with the tongues of the’ other washer to
linut retrograde movement of the nut.
2. A locking device composed of two oppositely
disposed identical Washers, each washer including
an annular~ body, a'series of spring tongues ex
tending circumferentlally ln one direction and
having the ends th>ereof deflected laterally of one 50
face of the body, a\series of biting teeth projecting
from the opposite face of the body and facing in
as said
tongues, the teeth of the respective washers bein
adapted to grip the work and the nut whereby
one washer is rotated relative tothe other and
the spring tongues snap past one another during
advance of the nut, said tongues interlocking
with each other to limit retrograde movement ,
of the nut.
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