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Патент USA US3077337

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Feb. 12, 1963
3,077,328
D. M. NELSON
SELF-TENSIONING LINK ASSEMBLY
Filed Oct. 19, 1959
2 Sheets-Sheet 1
INVENTOR.
DONALD M. NELSON
BY
/
49 Y 717M
_
ATTORNEY
Feb. 12., 1963
D. M. NELSON
3,077,328
SELF-TENSIONING LINK ASSEMBLY
Filed Oct. 19', 1959
2 Sheets-Sheet 2
FIG. 2
INVENTOR.
DONALD M. NELSON
BY
flow 5 . 727M
ATTORNEY
3,677,328
Patented Feb. 12, 1963
2
3,077,328
SELF-TENSHGNENG LENK A§SEMELY
Donald M. Nelson, Compton, ?alitl, assignor to
North American Aviation, inc.
Filed 0st. 19, 1959, Ser. No. 847,334
10 Qiaims. ((131. 248-617)
This invention relates to a novel self-tensioning link as
sembly, and more particularly to a self-tensioning link
with a cam seat formed on the bell crank control means.
When the tension imparted to the member to be supported
is approached, further turning of the screw cam means
secures the fastening member in a vise-like manner by
means of a compression surface formed on the bell crank
control means co-acting with a compression surface
formed on the housing.
The preferred embodiment of this invention, as shown
in FIG. 1, discloses the self-tensioning link assembly as
assembly having novel preloading spring means adapted 10 it would appear prior to its connection with an attached
to support a suspended member with a predetermined ten
member 1 to which it is desired to impart a predetermined
sion. The link assembly particularly ?nds indispensable
supporting tension.
utility when used with an astro-tracker in the pylon of a
missile whichis supported by an autonavigator prior to the
The member 1, to be suspended from the upper struc
ture, has an upstanding post 2 ?xedly secured thereto by
launching of a missile. Novel control means are mounted
on the side of the link assembly and are so positioned so
bolts 3. On the upper extremity of the post 2, an eye
member 4 is inserted in bushings 5 ?xed to the post. A
as to be easily accessible for the control and maintenance
thereof.
The prior art suggests many preloading mechanisms
to form an attachment therebetween. The bushings are
?xedly retained in post 2. by means of a washer 5a. In
which are bulky and expensive as well as being so COD‘: 20
shear pin 6 projects through the bushings and eye member
the speci?c illustrated embodiment the shear pin is so
structed that the operation thereof is di?icult, if not im
possible. The problem of maintaining a predetermined
constructed that the eye member 4 will detach from the
post 2 and bushing 5 upon a predetermined longitudinal
tension on a member to be suspended is of the utmost
separation force thercbetween.
importance, especially in the supporting of an astro-v
The above described attached member discloses one
tracker, since forces imparted thereto by the missile vibra-. 25 speci?c assembly, but it is to be understood that the at
tions are apt to damage the very delicate instrumentations
tached member may take any desired form depending on
therein.
the operational requirements.
This invention overcomes the inadequacies of the prior
A supporting member A from which it is desired to
art by providing a novel self-tensioning link assembly hav
suspend member 1 has the link assembly including a sta-.
ing readily accessible control means utilized to impart ten 30 tionary plate 7 mounted thereon by bolts 8. A pivot pin
sion to a spring means and then by subsequently clamping
9, shown as extending across a hole in plate 7 (FIG. 4),
the attached member in a positive position maintaining a
pivotally mounts a housing 10. At the lower end of the
predetermined tension on the suspended member.
housing 10 an internally threaded portion '11 projects on
An object of this invention is to provide a self-tensioning
the side thereof. A threaded end 12 of a setscrew 13 00-.
link assembly which may be easily applied to a suspended 35 operates with threaded portion 11 of housing 10 to c0n~v
member so as to impart a predetermined tension thereto
trol the longitudinal movement of setscrew 13. A trans:
and simultaneously lock the suspended member to the link
versely extending Pin 14 limits the rightward movement of.
setscrew 13 by abutting the surface 19;: of cylindrical
housing; 10. as Shown in FIG- ‘l.- A compression one
assembly, thus maintaining the predetermined tension
therein.
Another object of this invention is to provide novel 40 curing surface 1% of housing 10 is vadapted to abut a
control screw cam means mounted on the side of the link
complementary clamping surface 211:; of hook member 21.
assembly which control is easily accessible for preload
A cam portion 15 on screw 13 cooperates with cam seat
15 on a bell crank 17 to pivot said bell crank. The face
ing purposes.
Although the prime objects of this invention have been
read in connection with the drawings, other objects and
of the bell crank is formed with a compression surface v17a,
the function of which will be later described. A pivot pin
1-8 mounts the bell crank onv the housing 10. The beli
features of the invention will become apparent.
crank is extended to form a cam comprising fork mem
. FIG. 1 is a side view of the self-tensioning link assembly
in disconnected or open position.
ing clamping surface 21b formed thereon, is contained in
set forth, when the following speci?cation and claims are
bers 19 and a seat 243. A fastening hook member 21 hava
FIG. 2 shows the self-tensioning link assembly of FIG.
the housing 10 and has a ?rst washer ‘22. slidably mounted
1 as applied to a suspended member with the link as:
on the mid-portion and a fixed washer 23 mounted on
the top thereof. A compression spring 24 is mounted be
sembly and suspended member subjected to a predeter
mined tension.
tween the washers.
FIG. 3 is a right hand side View of the self-tensioning
A shoulder 25 is formed on the hook member and the
link assembly of FIG. 2.
55 ?ange 24) of the bell crank 17 is adapted to lie between
FIG. 4 is a top view of FIG. 2.
FIG. 5 is a cross-sectional view taken on line 5-5 of
FIG. 2.
FIG. 6 is a cross-sectional view taken on line 6—6 of
FIG. 2.
The invention comprises a tension link assembly com-.
prising a plate member which is adapted to be fastened
to a support structure. A pivot pin‘pivotally mounts a
this
assembly
shoulder
is inand
disconnected
the slidable
position.
washer 22
A transverse
when the hole
26 is formed in the hook member so as to provide a
passage with sufficient clearance whereby the setscrew may
be inserted. The clearance further assures that the hook
member 21 has complete freedom upon the longitudinai
movements thereof within housing 10.
'
housing which slidably contains the fastening member.
The lower extremity of the hook member is formed
with the hook portion 27, which is adapted to cooperate
The lower end of the fastening member is constructed in
ahook-like fashion and is adapted to be secured to com
with the eye member 4 to form an attachment therebe
tween as shown in FIG. 2. A projectiovn'23 limits the
plementary fastening means on the member to be sup—
clockwise swinging movement of the tension link assembly
ported. Compression spring means encircle the fastening
~ being adapted to abut post 2 as in FIG. 2.
member and is adapted to be compressed by bell crank
A tension spring 29 is attached at one end to the sta-,
control means pivotally mounted on the side of the hous 70 tionary plate '7 and at the other end to the bell crank 17
ing. Screw cam means project from the side of the hous
so as to bias the tension link assembly in a counterclock
ing and have a cam portion thereon adapted to cooperate
wise direction into the inoperative position of FIG. -1.
3,077,328
4
- From the aforedescribed novel arrangement, it is ap
member slidably mounted in said housing and having a
parent that the tension link assembly may be positioned
in very con?ning areas while providing simple control
hook means on the lower end thereof adapted to ten
means which are readily accessible for preloading.
for urging said fastening member in an upward direc
sionally support a suspended member; compression means
tion; bell crank means mounted on said housing for urg
Operation
When it is desired to support an attached member with
ing said compression means into a compressed condition;
means mounting said bell crank for limited motion to
a predetermined tension the tension link assembly of
limit the compressive force exerted by the bell crank upon
said compression means to a predetermined amount;
FIG. 1 is pivoted in a clockwise direction so that the hook
27 is inserted in the eye member 4. A conventional 10 means mounted to the housing and engaged with the bell
crank for imparting said limited motion to said bell crank
torque wrench is placed on the setscrew 13 and the screw
is rotated. until the predetermined torque is achieved.
means so as to impart a predetermined support tension to
Any type of conventional cooperating torque imparting
the suspend-ed member.
12. The tension link assembly of claim 1 further com
prising: a projection on said fastening member adjacent
tool may be utilized to rotate setscrew 13, depending on
the available tools and operational requirements.
‘As clearly shown in FIG. 2, upon the turning of the
said hook ‘means adapted to engage the suspended mem
ber so as to limit the pivotal movement of said fastening
member.
direction, consequently raising washer 22. The washer
22 in turn imparts a compression force to spring 24 which
3. The tension link assembly of claim 2 further com
force is directly transmitted to the fastening hook mem 20 prising: a tension spring means secured to said ?rst men
tioned member and to said bell crank means for urging
ber ‘21 by Way of the ?xed washer 23. The hook 27 is
said bell crank means towards said ?rst mentioned mem
consequently biased in an upward direction thus, impart
ing a lifting force to eye member 4 and attached mem
ber.
4. The tension link assembly of claim 1 further com
ber 1.
Simultaneously with achieving the predetermined ten
prising: compression surface means on said housing and
cooperative compression surface means on said bell crank
sion as noted on a conventional torque indicating wrench,
adapted to secure said fastening member and supportsaid
for example, the device as shown is so constructed that
setscrew 13, the bell crank 17 is pivoted in a clockwise
suspended member at the predetermined tension imparted
upon turning of the setscrew 13 the compression surface
to the suspended member by said screw cam means.
17a of bell crank 17 cooperates with the opposing com
5. A tension link assembly for supporting a suspended
pression surface ltlb of housing 10 to grip hook member 30
21 in a vise like manner due to the arrangement of clamp
member at a ?rst predetermined tension, the tension link
assembly comprising: a housing extending downwardly
ing surfaces 21a and 21b thereon. Consequently, the
from a member and pivoted thereupon; a fastening mem
fastening hook member 21 and suspended member 1 are
ber slidably mounted in said housing having a ?rst fasten
secured and supported at a predetermined tension.
The tension link assembly may be utilized to function 35 ing means on the lower end thereof adapted to extend
beyond the bottom of said housing; control means for
as a shock absorber, that is, to allow the assembly to
sliding said fastening member upwardly in said housing
absorb sudden extreme shocks by adjusting the setscrew
to support said suspended member at said ?rst prede
so that the friction as between surfaces 17a-21b and
10b and 21a respectively will compensate for an extreme
termined tension; the suspended member including: a
load imparted to the suspended member 1. However, it 40 post extending upwardly toward and adjacent to said ?rst
fastening means; a second fastening means ?xedly mount
is obvious that the embodiment as shown will permit the
ed on the top of said post and adapted to separate from
further-step of locking the attached member 1 at a pre
said post when a second predetermined relative tension
- The aforedescribed self-tensioning link assembly ?nds
occurs therebetween, the tension link assembly adapted
considerable utility in the missile industry wherein ‘an 45 to secure said ?rst fastening means to said second fastening
means so as to support said suspended member with said
astro-tracker in a pylon must'be suspended from a stabi~
?rst predetermined tension.
'
lized platform of the autonavigator under a predetermined
6. The invention of claim 5 further comprising: a
tension. In this speci?c application, suspended member
projection on said fastening member adjacent said ?rst
1 constitutes the astro-tracker which is mounted and
carried on a missile during its flight pattern. Upon re 50 fastening means adapted to abut said post.
7. The invention of claim 6 further comprising: a ten
leasing the missile, pin 6 is sheared and the astro-tracker is
sion spring means secured to the said member pivotally
free to fall with the missile. The maximum load which
the pin 6 is capable of carrying prior to the shearing there
mounting said housing, and to said control means, the
tension spring means adapted to pivot said control means
of is, of course, determined before the installation thereof.
In such an application, it is desirable to put some ten 55 away from said post.
8. The invention of claim 5 further comprising: means
sion on the astro-tracker, however; not to a degree which
would prematurely shear pin 6. At the same time the
on said housing cooperating with compression surface
astro-tracker must be supported on the autonavigator with
means included in said control means for securing and
sui?cient tension to hold the astro-tracker in a relative
supporting said suspended member with said ?rst predeter
?rm and stable position prior to the missile launching.
60 mined tension imparted thereto by said control means
Previous astro-tracker support assemblies provided a
which is less than that necessary to separate said second
relatively large shear pin 6, which pin when sheared upon
fastening‘means and said post.
determinedtension.
'
_
the missile release would cause a severe jolt to the auto
9. The invention of claim 5 wherein the control‘ means
includes a compression spring means on said fastening
It is to be again noted that such a novel self-tensioning 65 member adapted to bias said fastening member in an
navigator causing the failure thereof.
link assembly is adapted to be placed in very con?ning
areas and is readily accessible to the operator for, expedi
upward direction relative to said suspended member.
10.'A tension link assembly comprising: a stationary
member; a ?rst pivot pin on said stationary member; a
tious control thereof.
Although one speci?c embodiment of the invention has
housing extending downwardly from said stationary mem
been illustrated it is obvious that various changes and 70 ber and pivoted on said pin; a fastening member in said
modi?cations may be made thereto without departing
housing having a hooked end on the lower end thereof
from the scope of the invention.
extending beyond said housing and adapted to be opera
tively fastened to a complementary fastened member; a
Iclaim:
>. 1. A tension link assembly comprising: pivot means
?rst Washer ?xed to the upper end of the fastening mem:
on a member vpivotally mounting a housing; a fastening 76 her; a second Washer slidably mounted on said fastening
3,077,328
5
6
member on the mid-portion thereof; a ?rst spring sur
said stationary member and said bell crank adapted to
pivot said bell crank and housing away from said comple
mentary fastened member.
rounding said fastening member mounted between said
?rst and second washers so as to bias the second washer
downwardly relative to said ?rst washer; a shoulder por
tion on said fastening member below said second washer;
means de?ning a hole in said fastening member below
References Cited in the ?le of this patent
said shoulder portion transversely of the longitudinal axis
UNITED STATES PATENTS
thereof; ?rst thread means formed on one side of said
housing transverse to the longitudinal axis thereof and
aligned with the hole de?ned in said fastening member; 10
a setscrew extending through said housing, the hole de~
?ned in said fastening member, and having a second
thread means on one end thereof cooperating with said
?rst thread means for seelctive longitudinal movement of
the setscrew; ?rst cam means formed on the other end of 15
said setscrew; a second pivot pin mounted on the housing
adjacent said ?rst cam means; a bell crank .pivotally
mounted on said second pivot pin; a second cam means on
said bell crank cooperating with said ?rst cam means to
pivot said bell crank upon selective rotation of said set 20
screw; third cam means formed on and extending from
said bell crank beneath the second washer adapted to lift
said second Washer so as to impart a predetermined
tension to said fastening member and said complemen
tary fastened member; second spring means secured to 25
556,547
1,208,298
1,298,072
1,394,962
1,524,175
1,592,067
1,681,050
1,822,236
1,931,850
1,936,461
2,605,123
2,647,287
2,651,482
2,709,611
2,833,005
2,844,048
2,951,421
Marichal ____________ __ Mar. 17, 1896
Cunny ______________ __ Dec. 12, 1916
McNabney et al _______ __ Mar. 25, 1919
Bate ________________ __ 'Oct. 25,
Eggers _____________ __ Jan. 27,
Beetem _____________ __ July 13,
Robinson ___________ __ Aug. 14,
Pilblad _____________ __ Sept. 8,
Moore ______________ .._ Oct. 24,
Sando et a1. _________ __ Nov. 21,
1921
1925
1926
1928
1931
1933
1933
Gland-Mantle ________ __
Jones _______________ __
O’Connor ___________ _..
Claud-Mantle ________ __
Barry _______________ __
Bennett et a1. ________ __
Katzen ______________ __
1952
1953
1953
1955
1958
1958
1960
July 29,
Aug. 4,
Sept. 8,
May 31,
May 6,
July 22,
Sept. 6,
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