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Patented Nov. 19, 1946
‘ l2,411,245
UNITED STATES PATENT OFFICE
2,411,245
NUT TIGHTENER
John Henry Bueehler, Chicago, Ill.
Application November 13, 1944, Serial No. 563,164
6 Claims. (Cl. 85-32)
1
2
My invention relates to nut locks, and more
vparticularly to devices which are designed to
It is noted that the spring is flared upwardly, has
act automatically to tighten or screw down a
nut which may become loosened from vibration,
and one object is to provide a device of this kind
which requires no alteration of the nut.
A `further object is to provide a nut tightener
its upper end portion II bent in as a cross bar
and its lower end portion I2 formed as a hook.
The second component of the nut tightener is in
the form of a sleeve I3 of hexagonal design to be
suitable to slide over a nut of the same form and
approximate size. It is understood that the sleeve
may be made square or of any other design to
which employs a form or accessory sleeve as its
conform to the type of nut it is intended to serve.
base and for the purpose of imparting the tighten
10 The topedge I4 of the sleeve is formed with a
ing movement to the nut.
series of oblique and diametrically paired notches
Another object is to provide a device of the
or pockets I5, the `floors of these rising with in
above character which uses the projecting end
clines I5 to the original level of the said top edge.
of the screw or bolt on which the nut is mounted
The sleeve also has an outward base flange I 1,
as an anchor to maintain a torsional iníiuence
15 one portion of which is raised in the form of `a
on the nut.
hump I8 containing a perforation I9 in its crown.
A still further object is to secure the anchor
The sleeve is of light sheet metal, and may be
referred to above by means of a slot in the end of
made in the form of a stamping.`
the screw or bolt where such end is superiiuous
The coil spring I0 and the sleeve I3 are intended
and therefore suffers no weakening influence from
20 to be joined as a unit which may be kept or stocked
the presence of the slot.
in readiness forrapplication to a nut whenever
An additional object is to provide a nut tighten
desired. In its normal or original form the spring
er which can be kept in stock as a unit `for in
is taller than the sleeve; and the bottom of the
stant application to the nut when required.
spring is of a diameter to ñt smoothly around the Y
An important ‘object of the invention is to con
stitute the novel tightener in a manner to be 25 body of the sleeve when the spring is mounted
thereon. When this is done, the hook I2 of the
pre-wound by means at the factory or plant
spring is caught in the perforation of the sleeve
where it is manufactured and applied to the nut
hump I8, as indicated in Fig. 6.
by a simple tool in a manner to transfer its in
The joining of the spring IB with the sleeve
fluence to the same.
An essential object of the invention is to con 30 I3 also involves the tensioning of the spring in
relation to the sleeve. This is done by winding
struct the same of only two parts, and in a form
the spring from the top, and involves the rotation
to be produced at small expense.
of the spring cross bar Il in a clockwise direction
With the above objects in View and any others
in accordance with Fig. 2. The winding may
which may suggest themselves from the descrip
be done by means of a key-wrench 20 formed with
tion to follow, a better understanding of the in
bayonet slots 2| at the bottom, these serving to
vention may be had by reference to the accom
retain the cross bar II against dropping out of
panying drawing, in which
the wrench after the latter has been lowered on
Fig. 1 is a perspective view of a tool employed
the cross bar and given a partial turn. If the
to wind the nut tightener;
Fig. 2 is a perspective View of a spring forming 40 winding influence on the sleeve iis too strong
for the same to be held by hand, the sleeve may
one component of the tightener;
first be mounted on a hexagonal die 22 having a
Fig. 3 is a similar view of a shell forming the
flanged base 23 and forming part of an inverted
other component thereof;
key-wrench 24. The spring may now be wound
Fig. 4 is another view showing a die employed
45 to a desired tension and to a point where the
for winding of the tightener;
cross bar II spans an opposed pair of the sleeve
Fig. 5 is a perspective view of a bolt and nut
notches I5. The cross bar has sufficient length
assembly in readiness for the application of the
tightener;
for this purpose by extending fully across the top
spring coil. Downward pressure on the wrench
Fig. 6 is a perspective view showing the manner
50 20 will seat the cross bar in the notches I5, and
in which the container is wound and set; and
a backward turn and lift of the wrench will
Fig. 7 is an elevation of the bolt and nut as
cause it to release the spring. The latter is now
sembly with the tightener mounted thereon.
wrapped in tensioned relation to the sleeve. It
In accordance with the foregoing, specific refer
will now be appreciated that the original height
ence to the drawing indicates the first-mentioned
and flare of the spring were necessary because
component of the tightener as a coil spring I0.
2,411,245
.
4
3
the spring not only shortens when its convolu
useful or required length of the bolt; and such
tions get closer from winding, but the coils also
portion will of course have more strength than
have a contracting tendency from the winding
necessary to resist the tension of the spring.
end, so that the ilares provides suñicient room
It will be evident from the above description
between the spring and the body of the sleevel C1 that I have provided a nutl tightener which can
to allow for the contraction of the spring as it is
Wound.
'
be kept or stocked as a unit or accessory in the
Wound or “set condition for use as needed. In
When the unit formed by the spring and the
such event a simple key-wrench or like implement
sleeve has been wound by its accessory wrenches,
suffices to ñt the tightener to the vvork.k It can .
the assembly appears as in Fig. 6. However, when 10 then remain in place indefinitely, takes up little
the unit is in production the hand-wrench Wind
ing method-treated and illustrated merely as an
example or shop expedient-_will be replaced by
suitable machine methods, particularly where theA
springs are of heavier gage or the required tension
stronger.
more room than the nut and will not get out of
order or adjustment, acting automatically to take
up nut looseness in the event of vibration, settling
orfshrinkage of the work or material secured.
Also, the Cotter-pin> expedient is applicable to
insure against the loss of the tightener in any >
The application of a nut tightener unit of the
event. Further., the device consists of only two
above character to the work requires no change in
parts made of commonly available materials and
the nut, and only a slight change in the bolt.
capable of being fabricated and assembled by
Thus, an assembly of a‘bolt 25 with a nut 26 20 machine methods, so that the tightener may be
tightened on a pair of plates -21 is shown in Fig. 5.
produced at low cost, to sell in an assortment of
The threaded bolt shank 2% rising above the nut
sizes vancl'alo'ng with a line 'of slotted vbolts and
is diametricaïl-ly slotted for the present purpose, as
accessory key-Wrenches to . manufacturers and
indicated at 329, the Width of the slot being pref~
users -`of machinery, engines and the like.
erably two-thirds the diameter of the bolt shank 25
While I have described the invention along
23. In application, the tensioned unit of the
speciiic lines, various minor ’changes or refine
spring it and sleeve i3 is mounted to seat the
ments may be rïnade therein without departing
sleeve base ilange vIl on the upper plate 2l and
from its principles, and I desire to consider such
the sleeve body> around and in iitting relation
changes and reiinements as coming Within the
with the nut. ` The'key-wrench v2i! is now applied 30 scope and spirit of the appended claims.
to the spring cross bar H with a winding inñuence
to raise it out of the notches l5 and oí the sleeve.
I claim;
v
fl. A pre-set tightenei' for a nut securing work
Now the wrench is Veither held or turned to locate
on »a (bolt, wherein the »free end 'of the latter pro
the cross bar Vover the slot' 29, depressed to seat
jects from the -nut and is Vformed with anV "end slot,
th‘e‘cross bar deeply in the slot, _and removed. The 35 comprising a member adapted to be mounted .non
» `tension of ther-spring ynow holds its cross bar
firmly in the slot, and the sleeve exerts pressure
on the nut in the> tightening direction. Y rI'hus,
should the nut loosen somewhat ‘from vibration
rotatably on thenut, andfa woundfco'il spring
Ysurrounding the member, the ends of “the spring
being attached to the member, on'e end 'or the
spring being movable from the member and`
or the settling ofthe parts secured by the bolt, 40 adapted to be secured to the bolt by-being .de
the sleeve will instantly tighten the nut and hold
posited in said slot, and thewïinfding of t'h‘espring
such parïts secure.
f
vbeing in a direction to influence themenii‘ber to
While 'it may rarely occur, ¿it is possible that
turn the nut in the tightening direction.
over a long period of use ‘the nut tightener may
2. 'Ih'e structure of claim 1, said member being
take up loosenessso far as to cause the spring to t l a sleeve with notch means in one end, vand said
lose most or all of its tension. In such event, and
particularly when the bolt extends at an angle or
in a horizontal position, the tightener could slide
or fall 01T from vibration or impact by som-e object.
means.
Figs. 5 and 7 show a simple expedient against '
ametri’cally-opposite sides in `one end, -and said
such an eventuality. Thus, the bolt shank may
oneend of theV ‘spring being a cross bar 'deposited
in said pair of notches 'and locked in said notches
be made with a cross-bore `Sil near its free end,
and a Cotter pin 3i ‘applied after the nut tightener
one end ‘of ‘the spring lbeing 'deposited in said notch
'3. vThe structure 'of claim l, Said member being
a sleeve with a pair of undercut notches -on -oli-
has been ñtted. In this case the latter can at no
by the tension of the spring.
4. The structure of claim l, said member'being
time slide or be knocked off` or become lost.
It has been mentioned that the width of the
ametrically-’oppo'site sides in one end„an~d said
slot is as much as two-thirds oîf the bolt shank
diameter. This allows a wider latitude in the
location of the slot by the cross bar l I when the
Ytighten’er is rltted to the nut, so that the slot Iis
"found quite readily as the key-Wrench is turned.
It is also possible to apply the tightener Without
the use of the key-wrench. Thus, when 'the ‘tight
ener is positioned with the cross bar il in aline
ment with the slot 29 and mounted on the nut 65
with pressure, the ‘cross bar will be raised outl of
the tightener by the bottom of th‘e slot. The extra
width of the latter does not weaken the bolt, since
the slot is made in a portion Well beyond the
a «sleeve with a pair of undercut notches on di
one end of the spring being across bar deposited
in 'said pair of notches and locked in said notches
by the tension of the spring., the floors >of the
notches extending inclinedly to said end of th
sleeve.
.
.
Y
5. The structure of `claim 1., the spring being
ilared in the direction 'of said `end prior t0 being
Wound.
6. The structure of claim l, said member 'being
a sleeve around the nut, andthe lspringl being
-taller than the sleeve prior to being wound.
. JOHN HENRY BUECHLERQ
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