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Патент USA US2412566

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Dec. 17, 1946
e. w. DE BELL ETAL
I
2,412,566
TURNBUCKLE FAIRING AND LOCK
'Filed’June 20, 1942
2 Sheets-Sheet l
5.1lv.l:
TI L
Il kl.
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INVENTOR
GEORGE W. DE BELL
THOMAS C. HILL
Patented Dec. 17, 1946
' 2,412,565
UNITED STATES PATENT OFFICE
2,412,566
TURNBUilKLE FAIRING AND LOCK
George W. De Beil; Middle River, and ‘Thomas-C.
Hili, Baltimore, Md, assignors to The Glenn‘L.
Martin Company, Middle River, Md, a corpo
ration of Maryland
Application June 20, 1942, Serial No. 447,876
13 Claims. (Cl. 287-450)
1
2
This invention relates to turnbuckles and par
ticularly to the safetying of aircraft turnbuckles
which must be frequently inspected and adjusted.
an aircraft turnbuckle assembly consists of a
be of any external shape. The interior surfaces
barrel portion. a left-hand cable terminal and a
transparent plastic material when applied to air
craft turnbuckles to facilitate inspection. How
ever, they can be fashioned out of anyother suit
right'hand cable terminal. It is usually adjusted
and then looked in the adjusted position by means
of safety wire. The safety wire is wrapped about
of our sleeve sections can likewise be made in any
desired shape.
These sleeve sections are preferably made. of
able material such as metal or wood.
Each sleeve section is placed over its respective
the parts of the assembly in a manner that will
prevent the cable terminals from turning in re 10 half of a turnbuckle assembly, and after the
lation to each other or the barrel portion. The
turnbuckle has been adjusted to ?nal position,
ultimate object of the safety wire is to prevent
the sleeve sections are brought together by means
the relative rotation of the turnbuckle assembly
of a snap ring set in a groove extending around
parts when they are subjected to strain or vi
the intermeshed castellations.
bration.
Safetying aircraft turnbuckles with wire neces
sitates the complete removal and replacement of
the safetying wire each time the turnbuckle is
adjusted.
‘
Turnbuckles are ordinarily provided with cable
terminals having external hexagonal or like grip
ping surfaces for the purposes of adjusting the
turnbuckle. The inner hexagonal portions'of ‘our
sleeve sections ?t over these external hexagonal
Unless a mechanic skilled in the method of 20 terminal portions. sothat relative rotationiispre
vented.
.
adjusting and wire-safetying turnbuckles is em
ployed for this operation it is quite possible that
the safetying wire will not be correctly wrapped
Turnbuckle barrels-are usually provided with
an aperture or hole near their centers through
which the safetying wire is threaded. However,
in the right direction about the turnbuckle as
sembly and that the said asssembly will Work Na CI in our invention we’ insert a cotter pin through
this hole in the turnbuckle barrel.
loose when subject to the usual aircraft vibra
tions and strains.
-
Wire-safetied turnbuckles by nature arerrough
Appropriate’ slots to receive the cotter pin are
provided in our transparent plastic sleeve sec
tions. Thus, each of‘ the sleeve sectionstprevent
cable. The aircraft industry spends countless 30 rotation between the barrel and one of‘the hex
agonal-shaped cable terminal gripping surfaces
hours each year designing structure wherein
by its slotted engagement of the cotter pin-and
cables containing “knotty” turnbuckles will not
its inner hexagonal engagement of the external
interfere with other like cables or the structure
hexagonal cable terminal surface. Each sleeve
itself, in their travels within an airplane. This
disadvantage has proved most costly to aircraft 35 section therefore‘ prevents rotation between the
turnbuckle barrel and the hexagonal cable ter
manufacturers not only from the standpoint of
surfaced assemblies not unlike knots in a rope or
the expense incurred in the attempt to design a
turnbuckle assembly free from such protuber
minal surface which it covers.
Inasmuch as our sleeve sections have smooth
outer surfaces, the two sections. when locked to,
ances, but also from the fact that numerous
crack-ups have been traced. directly'to fouled 40 gether over a turnbuckle assembly form a smooth
fairing’ cover forit.
turnbuckles in the control cablesias wellas; other
'l'heprimary object of this invention is to; pro:
cables; the; free movement'of'which is’ obviously
vide- a smooth, transparent plastic,_ well-falred
imperative.
turnbuckle cover which may be used to safety
We have discovered that all of the aforemen
tioned undesirable features inherent in present 45 aircraft turnbuckles.
Another object of the invention is to provide
aircraft turnbuckle‘ practice: can‘be eliminated if
a locking means for turnbuckle assemblies that
a turnbuckle is safetied by means of sleeve. sec
allows easy access for adjustment purposes.
tions of transparent plastic'material which are
:j Stillanother object of theinvention is to pro
castellated at one end and have‘ hexagonal or
other: suitable interior cable terminal gripping 50 vide a smoothesurfaced transparent cover-lock
for turnbuckle assemblies that will‘permitinspec
surfaces. at the. other end. .
tion therethrough.
It should be understood that the surfaces" of
A further object of the invention is to provide
the cable terminals need not‘ be of hexagonal
a slide-on safetying cover-lock for turnbuckle
shape to provide adequate‘ gripping surfaces. for
the purpose of adjustment. but that they could 55
assemblies.
‘
>
2,412,566
4
3
Still another object of the invention is to pro
The sleeve sections are then slid over their re
vide a safetying means for aircraft turnbuckles
spective parts of the turnbuckle and are brought
together with their castellations meshed adjacent
that will positively prevent all relative movement
between the different parts of the turnbuckle
assembly.
the barrel portion of member 6, and with their
5 elongated slots 24 in alignment with the cotter
pin 26 through the member 6. The head 21 and
Further objects of the present invention will
outwardly bent legs 28 of the cotter pin lie below
become more apparent from the description of the
the outer surface of the sleeve section or cover
accompanying drawings which form a part of this
and do not project outwardly thereof, and prevent
disclosure and wherein like reference numbers
refer to like parts. It is to be understood that‘ 10' the cover it) from rotating with respect to the
barrel portion?. Sleeve sections I2 are held in
certain changes, substitutions, alterations and
meshed relation by means of the resilient ring 22
modi?cations may be made without departing
snapped into position in the groove 20.
from the spirit and scope of the appended claims.
The inner hexagonal surfaces of portions I4 are
In the drawings in which like reference‘nu
15 engaged with the hexagonal nut portions 8 so that
merals indicate like parts:
Fig. 1 is a plan view of the invention;
Fig. 2 is an enlarged longitudinal cross-sec
tional view of a portion of Fig. 1;
Fig. 3 is a cross-sectional view along the plane
indicated by the line 3--3, Fig. 2.
Fig. 4 is a, cross-sectional view along the plane
indicated by the line 4-4, Fig. 2;
the sleeve sections cannot turn with respect to
the cable terminals 2 and 4. Inasmuch as they
cannot turn with respect to their cable terminals,
and cannot turn with respect to barrel portion 6,
it is obvious that the cover effectively locks the
cable terminals 2 and 4 against turning with re~
spect to barrel portion 6 and, therefore, effec
tively locks the turnbuckle assembly.
Fig. 5 is a perspective view illustrating the
As the cover presents a smooth exterior sur
method of assembling the parts of the cover into
face, no projection exists which can catch upon
‘position upon the turnbuckle.
any adjacent cable or structural member.
Figs. 6 to 13 'show similar views of a modi?ed
The invention illustrated in Figs, 6 to 13 is a
form of the invention.
simpli?ed modi?cation of the aforementioned
In Figs. 1, 2 and 5 the turnbuckle is composed
structure in that internal hexagonal or other ir
of cable terminals 2 and 4 threaded to a barrel
portion 6. Each of the cable terminals 2 and 4 30 regular surfaces positioned adjacent the castel
lated ends of the transparent sleeve sections,
are provided with a hexagonal nut portion 8 by
which are adapted to co-act with external hex
means of which the cable terminals are adjusted
agonal or other irregular surfaces of the barrel
in the barrel portion 8 and with respect to each
portion when moved into inter-meshed relation,
other. This is conventional turnbuckle construc
‘
35 are substituted for the cotter pin.
tion.
Turnbuckles are ordinarily provided with cable
The self-locking fairing cover ID of this inven
terminals having external hexagonal or like grip
tion is shown covering the turnbuckle between the
ping surfaces for the purpose of adjusting the
nut portions 8. This cover is made in two sleeve
turnbuckle. The internal hexagonal portions lo
half sections I2, each of which is similar or iden
tical to the other and each of which is composed 40 'cated at the outer ends of the sleeve sections ?t
‘over these external hexagonal terminal portions
of a narrow cylindrical portion I4, the inner sur
so that relative movement between the two ter
face of which is hexagonally shaped so that it
minals is prevented.
closely ?ts over the nut portion 8, note Fig. 3,
As shown in the drawings, the sleeve sections
and an enlarged portion I 6 ‘terminating in a cas
tellated end I8, the castellations of one of the
- are held against movement along the longitudinal
sections being complementary to the castellations
in the other section. The castellated portions I8
barrel portion contacting the ?ared portion of
‘also include‘ a peripheral groove 20 which is
adapted to receive a resilient snap ring 22, when
the castellations are meshed with each other. The ;
castellations further include a pair of diametri
cally opposed elongated slots 24 which are adapted
to receive the ends of a cotter pin 26.
axis of the turnbuckle by means of the- central
the internal hexagonal portion of the sleeve sec
tions‘
.
Thus it will be seen that the internal hexagonal
portions of the transparent fairing and locking
sleeves co-act with the corresponding external
hexagonal surfaces of the turnbuckle so as to
prevent relative movement between the com
ponent parts of the entire unit.
Referring to the drawings and more particu
transparent moldable substance so that after it
larly to Figure 6 thereof, the turnbuckle is com
has been placed in position the turnbuckle can be
posed of cable terminals I I0 and I I2 adapted to
readily inspected. Any of the synthetic resins
be threaded, to'a barrel portion I I4. Each of the
which are transparent and are capable of being
molded, and have the necessary strength are suit to cableterminals H0 and I I2 is provided with a
hexagonal nut portion I I6 by means of which the
able for this purpose. The free ends I3 of narrow
cable terminals are adjusted in the barrel portion
portion >‘I4 are rounded so they will slip byany
II4 with respect to each other. This. is conven
obstruction. For a similar reason the transition
tional turnbuckle construction. In the present
part I5 of the cover between narrow portion I4
invention, the barrel portion [I4 is further pro
and wide portion I6 is formed as a gradually in
vided with a hexagonal portion 1 I8; the function
clined smooth surface.
I
of which is later to be described.
'
The operation of the device is as follows:
The self-locking fairing cover I20 of this inven
Before the cable terminals 2 and .4 are screwed
tion is shown covering the turnbuckle between the
into the .barrel portion 6, a sleeve section. I2 is
nut portions _II6. This cover is made in two
slipped over .eachcable terminaland down the
sleeve portions I22 and I24, each of which is simi
cable ‘connected to each , cable terminal. The
lar or identical to the other and each of which
cable terminals then are screwed into the barrel
has an internal hexagonally-shaped surface I25
portion 6, which has cotter pin 26 already installed
and I28 respectively at each end thereof and a
in hole 25 as in Fig. 2, and adjusted to ?nal posi
Cover I0 may be made of metal or any other
suitable material, but is preferably made of a i
tion by means of the hexagonal nut portions 8.
castellated portion I30 at their abutting ends,
23391568
6
5
the castellations of one of the-‘section's being com
both said locking means'b'eing within the stream~
plementary to the cast'ellations-o'f the'othersec
lined surface of said sleeve.
3'. In combination, a turnbuckle comprising a
'tion. The castellated portions I30" also include
a peripheral groove I32 which is adapted to re
ceive, when the castellations are'intermeshed, a
resilient snap ring I 34.
,
7
Cover I26 may be made of metal'or ‘any other
suitable material; but is preferably made of a
transparent substance to permit of ready inspec
tion without the necessity'o'f'disassembling. Any
of the synthetic resins which are transparent and
capable of beingr molded, and having the neces
sary strength, are suitable for this‘ purpose. ’ The
pair of cable terminals having adjusting portions
of polygonal cross-section, a barrelportion unit
ing said cable terminals, and a. pair of transpar
ent plastic sleeve portions each enclosing part of
said barrel portion and part of said adjusting por
tion's', said sleeve portions being separably joined
together adjacent the midpoint of said‘ turn
buckle, and each of said sleeve portionshaving a
portion ofrits inner surface enclosing'on'e of said
adjusting portions shaped to conform therewith,
said sleeve portions being slotted near their joint
outer'ends of the sleeve portions H2 and i215 are
rounded so they will slip bv any obstruction. For 15 ure to conform'with a projection on said turn
buckle barrel portion so that when engaged said
a similar reason. it will likewise be noted that
portions prevent the rotation of the respective
the gradually inclined surfaces of the connected
sleeve portions l 22'and I24 present a smooth con
turnbuckle parts with each other.
-
4. A turnbuckle cover-lock comprising a'pair of
tour.
'20 identical transparent plastic sleeve members hav
The operation of the device is as follows:
ing a relatively small tubular portion joined by a
Before the cable terminals H0 and H2 are
smoothly inclined portion to a relatively large
screwed into the barrel portion H4, the sleeve
tubular portion, means for locking the ends of
portions I22 and !24 are slipped over each cable
the said large portions to each other and to a
terminal. The cable terminals are then screwed
turnbuckle barrel portion, and means for locking
into the barrel portion H4 and adjusted to a p'ree 25 the said small portions to the cable terminals of
determined position. The sleeve portions are
a turnbuckle assembly.
then slid over their respective parts of the turn
5. In combination, a turnbuckle, a transparent ‘
buckle and are brought together with their castel
fairing and locking cover for said turnbuckle, and
lations intermeshed adjacent the hexagonal sur~~
means integral with said turnbuckle and means
faces of the‘ barrel‘por'tion H4. Snap ring I34 is " integral with said fairing and locking cover for
then inserted in peripheral groove 932.
locking said turnbuckle and fairing and locking
Therefore, as the internal hexagonal portions
cover against relative rotational movement.
l26 are engaged with the hexagonal nut surface
6. In combination, a, turnbuckle having a bar
H6 so that the sleeve portions cannot turn with Q rel portion and cable terminals adjustably car
iii
respect to the cable terminals H0 and H2 and as
ried by said barrel portion, a cover for said barrel
the internal hexagonal portions I28 of the sleeves
portion and at least a part of said cable terminals,
are engaged with the external hexagonal surfaces
and means integral with said cover and means
H8 of the barrel portion H4 so that the sleeve
integral with said turnbuckle for locking said
portions cannot turn with relation to the barrel 40 cable terminals, barrel portion and cover against
portion I hi, it is obvious that the cover effectively
relative rotational movement.
locks the component parts of the turnbuckle as
7. In combination, a turnbuckle having a bar
sembly and associated fairing and locking means
rel portion, cable terminals adjustably carried by
from any relative movement, and this without
said barrel portion, and a transparent fairing and
the use of a cotter pin. It will be noted that 45 locking means covering said turnbuckle and at
sleeves I22 vand I24 are held against movement
least a portion of said cable terminals, said barrel
along the longitudinal axis of the turnbuckle by
portion and said cable terminals having an ex
means of the central barrel portion ll8 contact
ternal irregular cross section, said transparent
ing the flared portion !28 of the sleeve portions
fairing and locking means having corresponding
I22 and I24.
internal surfaces, said internal and external sur
The term “turnbuckle” as used in this applica
faces adapted to co-act to lock said barrel por
tion comprehends a central barrel portion, ter
tion, cable terminals and transparent fairing
minals adapted to be adjustably positioned in the
against relative movement.
ends of the central barrel portion, and means to
8. A locking andfairing cover for a turnbuckle
lock the aforementioned parts from relative move Li Li having threaded cable terminals and a central
ment.
barrel portion into which the threaded cable ter
We claim as our invention:
minals are screwed, said locking and fairing cover
1. A turnbuckle fairing cover comprising a pair
comprising two parts into which the turnbuckle
of transparent plastic sleeves having an interior
is adapted to be positioned; the barrel portion
shape complementary to the exterior shape of a
and the cable terminals of the turnbuckle having
turnbuckle, means for locking said sleeve portions
polygonal cross-section portions, the abutting
against translation with respect to each other and
ends of said fairing cover being provided With
means for locking said locked sleeve portions
similar interlocking ends to prevent relative rota- '
against rotation with any part of the turnbuckle
tional movement, the outer ends of said fairing
not restrained by the complementary shape of the 65 cover being provided with internal surfaces con
overlying sleeve portions, both said locking means
being Within the streamlined surface of said
sleeve.
2. A cover-lock for turnbuckles comprising a
forming with said polygonal portions, and means
for locking the abutting ends of the fairing cover
against longitudinal movement.
9. A locking and fairing cover for a turnbuckle
pair of sleeve sections each adapted to cover a' 70 having threaded cable terminals and a central
part of a turnbuckle assembly, means for locking ‘ barrel portion into which the threaded cable
said sleeve portions against translation with re-'
spect to each other, and means for locking each
terminals are screwed, said locking and fairing
cover comprising two parts into which the turn
of said sleeve sections against rotation with re
buckle is adapted to be positioned; the barrel '
spect to each part of the turnbuckle assembly,
portion and the cable terminals of the turnbuckle
2,412,566
7
8
having polygonal cross-section portions, the
tion thereby providing therearound at each side
abutting ends of said fairing cover being castel
lated to prevent relative rotational movement,
the outer ends of said fairing cover being pro
annular shoulder; of a pair of interchangeable
locking sleeves each of which is interiorly con
vided with internal surfaces conforming with said
polygonal portions, and means for locking the
abutting ends of the fairing cover against longi
tudinal movement.
10. A fairing cover for a turnbuckle, said turn
of said midlength portion an outwardly facing
toured to substantially ?t the outline of said
turnbuckle body with their ends abutting against
each other, and means locking the abutting ends
of said sleeves against separation by shifting out
wardly and against relative rotation, said sleeves
buckle comprising threaded cable terminals and 10 each having a-polygonal interior portion, and a
a central barrel portion into which the threaded
terminals are screwed, said fairing cover com
prising two abutting hollow members adapted to
receive said turnbuckle, the barrel portion and
cable terminals having polygonal cross-section’
portions, the inner surfaces of said fairing cover
members adjacent said polygonal portions shaped
to conform with the polygonal portions, and a
?ush locking means for securing the abutting
ends of said fairing cover members together.
11. A pair of sleeves ?ttable around av turn
buckle body, and means locking said sleeves
against separation and against relative rotation,
said sleeves each having a polygonal interior
rod having an axial screwthreaded connection
with each end of the turnbuckle body, each of said
rods having an integral polygonal portion re
ceived by said interior polygonal portion of one
of said sleeves.
13. A pair of twin sleeves ?ttable around a
turnbuckle body having a diametrically enlarged
midlength portion thereby providing therearound
at each side of said midlength portion an out
wardly facing annular shoulder, and means lock
ing said sleeves against separation by shifting
outwardly and against relative rotation, said
sleeves each having a polygonal interior portion,
and a rod having an axial screwthreaded con
portion, and a rod having an axial screwthreaded
connection with each end of the turnbuckle body,
each of said rods having an integral polygonal
nection with each end of the turnbuckle body,
each of said rods having an integral polygonal
portion received slidably by said interior polyg
onal portion of one of said sleeves,
onal portion of one of said sleeves.
portion received adj ustably by said interior polyg
'
12. The combination, with a turnbuckle body 30
having a diametrically enlarged midlength por
GEORGE W.v DE BELL.
THOMAS c. HILL.
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