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Патент USA US2410816

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Nov. 12, 1946. _
2,410,816
L. P. FRIEDER ETAL
MEcHANicAL RELEASE
Filed July 20, 1945
2 Sheets-Sheet ‘l
35
3.5’
'36
.92
1a
22'
2a
4a ‘
26"
' 13b
14
16'
W05: 6%
ATTQEI/ZZY
NOV. 12, 1946.
|__ p, FRlEDER ETAL.
2,410,816
MECHANICAL RELEASE
Filed July 20, 1945
2 Sheets-Sheet 2
Patented Nov. 12, 1945
UNITED STATES PATENT OFFICE
2,410,816
MECHANICAL RELEASE
Leonard P. Frieder, RockvilleCentre, and Walter
S. Finken, Brooklyn, N. Y.; said Finken assignor
to said .Frieder
Application July 20, 1945, Serial No. 606,192
9 Claims.
(Cl. 294-483)
1
2
This invention relates to mechanical releases.
It is among the objects of the invention to pro
tionship'by a pin 1 ‘l. Opposite walls of the outer
casing I 0 engage and support pin ll intermediate
theends of the casing and the pin traverses the
interior of the casing. The walls l8 and, IQ of
the inner casing H are provided with longitu
dinal slots ‘2t, 2!, for the travel of pin I‘! when
the inner casing is moved longitudinally of,_ the
vide a device for supporting a load and for ef
fecting release when the effect of the load thereon
is relieved.
Another object of the invention is to provide
a load-carrying and releasing device having a
hook for retaining engagement with a supporting
line when the device is stored and before it is
outer casing.
The limits of travel of the inner
casing with respect to the outer casing are deter
placed. into use for supporting a load and means 10 mined by the slots and pin I‘! as illustrated in
for arming the device in response to the appli
cation of a load thereto and whereby, when so
armed, the hook will be automatically operated
to disengage the supporting line upon relief of
the pull of the supporting line on the hook al
though its disengagement from the supporting
line is prevented by a positive lock so long as the
full effect of the load on the device is maintained.
Another object of the invention is to provide
a load-supporting structure wherein provision is
made for absorbing shock incident to an abrupt
pull upon the device as when a load becomes ef
fective thereon.
Other objects and advantages of the present
invention appear in the following description and
accompanying drawings in which the principle
of the invention and the best mode of applying
the same are disclosed.
Referring to the drawings,
.
.
Fig. 1 is a longitudinal section of a device in
corporating the principle of our invention;
Fig. 2 is a section of the device on line 2—2
of Fig. 1;
Fig. 3 is a view similar to Fig. 1 but illustrat
ing the device with its hook displaced to an inter
mediate position;
.
Fig. 4 is a longitudinal view of the device in
extended and armed condition;
Fig. 5 illustrates the action of the device in
releasing a supporting line.
Figs.
2 and 4.
,
. .
Within the inner casing there are mounted a
pair of bars 22,23 which are slotted at 24 and
25, respectively, to permit movement of the bars
with the inner casing. The lower ends of vthese
bars are fastened to the inner casing by pins 26,
2?, and the upper ends of these bars are con
nected to the inner casing by a sleeve 28 and a
pin 29. The. upper ends of slots 24 and 25 in
bars 22 and 23, respectively, engage pin I‘! when‘
the inner and outer casings are telescoped to
gether, Fig. 2. Sleeve 28 is mounted over a pin
29 which is engaged andsupported by the oppo
site walls It and IQ of the inner casing.
The inner casing H and attached bars 22 and -
23 constitute a slide through which the pull of
the load on one ‘end of the outer casing is trans
mittedto hook 3!} at the other end of the device.
The effect of the load suspended from the device
30 is transmitted through the device from hook 38
to pin 29 and from pin 29 to bars 22 and 23 to
pin H’ and the outer casing when the device is
being used to support a load as shown in Fig. 4.
While either the inner casing or the bars may
3: be made to, alone‘ ful?ll the load transmitting
function, the inner casing has the further func
tion of cooperating with the hook to lock the hook
in place when the inner casing is extended from
the outer casing under load-carrying conditions,
as explained hereinafter.
The device of the present invention includes
. Before the device is placed in tension by load
an outer tubular casing H) and an inner tubular -
ing, the slide comprising inner casing i l and bars
22 and 23 is telescoped. within the outer casing
in the. manner illustrated in Fig. 1. Opening 3!
in the base of the hook is elongated to permit
limited sliding movement between the hook and
the slide. The back of the hook has 'a projection
32 with a ?at surface 33 adapted to contact with
the inner wall of the outer casing Ill when the
slide and the outer casing are in nested relation
ship, as illustrated in‘Figs. land 3. The inner
casing I I is provided with a slot 341 for this pur
pose. The outer casing prevents the hook from
casing H nested within the outer casing and ar
ranged to slide longitudinally of each other and
in telescoping relationship. The outer casing I0
is attached at one end to a block I2 by means
of a pin 13 which extends through the block and
opposite side walls. of the casing. The block has
depending therefrom a lug l4 which is provided
with an opening i5 by which a load-supporting
line it is fastened to the block and the outer
casing.
When in use the load which is to‘be
lowered and released by the device is secured to
rotating and releasing ring 35 when the device
the load-supporting line It.
The two casings are held in assembled rela- 55 is being transported (Fig. 1) and until the lock
2,410,816
3
4
ing security of the outer casing is transferred to
strip 3'! constituting part of the inner easing dur
ing use of the device under load, Fig. 4.
locking relation with strip 37. The hook then piv
ots and passes through slot 34 under the action
The notch in the hook above shoulder 36 en
ables the upper end of the hook to be drawn from
inner casing H to the extent illustrated in Figs.
3 and 4. Hook 30 can be easily displaced from
the position shown in Fig. 1 to the position shown
in Fig. 3 by a light pull on the hook, and when
so displaced the hook will be in a position to be 10
thereby releasing ring 35.
locked against rotation by strip 31 until the pull
effected through line 38 is slackened. Ring 35
is attached to a supporting line 38 which may
be suspended from a hoist or a parachute, de
of the spring in the manner illustrated in Fig. 5,
Another device may then be attached to ring 35
for a subsequent carrying and releasing operation.
The device is attached to a ring 35 by ?rst
withdrawing the inner casing from the outer cas
ing and then placing the ring within the inner
casing and manually engaging the ring with hook
30. While the hook is thus engaged, locking
spring 45 is manually displaced from engaging
position with the lower edge of the inner casing
and the inner casing is telescoped within the outer
pending on the ?eld in which the invention is to 15 casing in the manner illustrated in Fig. l. 49 is a
ring reinforcing the end of the inner casing and
be used.
»
serves as a stop bearing against the outer casing
For assisting in unlocking hook 30 and dis
when the inner casing is fully nested within the
engaging the hook from ring 35, a spring 39 is pro
outer casing.
vided. The upper end of this spring is attached
What is claimed is:
to a loop of wire 40' which engages a, hole 4| in the
hook located on the side of pin 28 opposite from
1. In a device of the character described, the
combination comprising an outer casing, means
the point of engagement of ring 35 with the hook.
for attaching a load to said casing, an inner casing
The lower end of spring 39 has an elongated loop
in sliding relation to said outer casing, a pin sup
42 which is engaged by a loop 43 of a connecting
wire whose other end is also provided with a, loop 25 ported from opposite sides of said outer casing and
extending through longitudinal slots in said inner
44 surrounding. a pin 45 which is fastened in the
casing, a pair of longitudinally-extending bars
block [2 of the outer casing. The two loops 42
and 43 are so proportioned as to avoid causing the
within said inner casing, said bars being attached
to said inner casing, and having longitudinal slots
tensioning of spring 39 during most of the move
ment of hook 30 from the position illustrated in 30 for the passage of said pin, said inner casing be
ing displaceable relative to said outer casing and
Fig. 1 to the position illustrated in Fig. 3. In the
latter position, spring 39 is slightly tensioned.
When the e?ect of the load comes upon the de
limited to extended displacement by said pin,
means supported by said inner casing, a hook dis
posed within said inner casing whereby a line may
vice, hook 30 and the'slide, comprising bars 22
and 23 and the inner casing H, is drawn from 35 be hooked, said hook having an opening engaged
within the outer casing until stopped by engage
by said last-named means, means for holding
said inner and outer casings in extended positions,
ment of the slots 24 and 25 with pin H, as illus
trated in Fig, 4. The e?ect of shock resulting
and a spring having one end attached to the back
from a sudden pull on the device is absorbed dur
of said hook and its other end attached to said
ing initiation of the pull by the bearing pressure 40 outer casing, said spring being adapted to exert
of surface 33 on the inner wall surface of outer
sleeve ID. This pressure is proportional to the
amount of the load being applied through the sup
porting line 38. Because of the location of the
point of application of force between ring 35 and
hook 30, the hook tends to rock and thereby pro
vides pressure betweenthe back edge of the hook
and the outer casing. This is important in pre
venting strains in the supporting lines and also in
a parachute when the device is being used to drop 50
a load to the ground. When abutment 32 at the
back of the hook passes beyond the outer casing
the hook is locked in position relative to the inner
force on said hook when a pull is exerted on said
hook by a supporting line attached thereto and to
rotate said hook on its supporting means when
the pull on the supporting line is slackened.
2. In a device of the character described, the
combination comprising an outer casing, means
for attaching a load to said casing, an inner cas
ing in sliding relation to said outer casing, a pin
supported from opposite sides of said outer casing
and extending through longitudinal slots in said
inner casing, a pair of longitudinally-extending
bars within said inner casing, said bars being at
tached to said inner casing and having longitu
casing by strip 31 of the inner casing. During
dinal slots for the passage of said pin, said inner
55 casing being displaceable relative to said outer
comes tensioned, as illustrated in Fig, 4, and ex
casing and limited to extended displacement by
erts a couple on hook 30 in a direction for un
said pin, a pin supported by said inner casing, a
locking the hook from strip 31 and disengaging
hook disposed Within said inner casing whereby a
the hook from ring 35.
line may-be hooked, said hook having an open
When the device is armed and the inner sleeve 60 ing surrounding said last-named pin, said open
is fully extended, as shOWIl in Fig. 4, the inner
ing being elongated to permit limited sliding of
withdrawal of the hook and slide spring 39 be
sleeve is locked in extended position by a spring
said hook relative to said last-named pin, a pro
46. Spring 46 is fastened to the outer casing and
jecting surface on the back of said hook pro
is disposed in a slot 41 through which it projects
jecting through an opening in said inner casing
when uncovered by the inner casing to a, position 65 and adapted to engage the inner surface of said
below the lower edge of the inner casing, as shown
outer casing. when said casings are in inwardly
in Fig. 4. The spring is provided with a lip 48
telescoped relation, means fOr holding said inner
whereby the spring may be retracted when it is de
‘and outer casings in extended position, and a
sired to telescope the inner casing within the
spring having one end attached to said hook and
outer casing.
70 its other end attached to said outer casing, said
When the device is relieved of its carrying func
spring being adapted to retract said hook longi
tion, as when the load being carried thereby is
tudinally of said bars when pull on the supporting
caused to alight upon the ground, spring 39 re
line is slackened and to rotate said hook through
tracts hook 30 to a position below the upper end of
the opening in the inner casing to release the sup
slot 34 and thereby disengages the hook from 7 5 porting line.
" 2,410, 816
6
5
supporting line and saidcasing, said ‘mean'sin=
3. ‘In a device of'thevcharacter describedlthe
combination ~-co'mprising ianlouter' casing‘, means
tor attach-ing a load to said'icasing,'an-innercas—
'i-ng'in sliding-relation to sal‘d'outer'casing, va-"pih
supported from oppositevsides of said outer casing
and [extending threughilongitudinal slots in said
inner casing, a pair ~01? >longitudinally-extending
bars within said inner casing, said bars being at
tached to said inner casing and having, longi
tudinal slots for the passage of said pin, said
eluding a slide which is slotted for sliding engage
' ment with a pin supported by said casing, a'se'c
ond pin carried by said slide, a hook havinga slot
Cl
isurrounding said second pin, said'slot being- elon
gated in a direction ‘for movement of said ‘hook
l'loiigitudinally of said slide, a spring connected to
the back of said hook and to said casing for effect
ing force on said hook when said hook and slide
have been displaced relatively to said casing by
a pull on the supporting line attached to the
inner casing being displaceable relative to said
outer casing and limited to extended displacement
by said pin, a pin supported by said inner casing,
hook, whereby when the pull of the supporting
ing surrounding said last-named pin, said open
ing being elongated in a direction longitudinally
of said bars for permitting relative movement be
respect to said casing.
to the back of said hook, said spring being adapt
engagement with said line.
line on said hook is slackened said hook is drawn
lengthwise of said slide and rotated from hook
a hook disposed within said inner casing whereby
a line may be hooked, said hook having an open 15 ing engagement with said line, and means for
holding said slide in displaced relationship with
'
7. In a device of the character described, the
combination comprising a casing and means for
tween said hook and said bars, a spring attached ,
to the back of said hook and to said outer casing 20 attaching a load to the casing, means within said
casing whereby connection is made between a
and normally ineffective to restrain the movement
supporting line and said casing, said means in
of said hook relative to said bars, but effective to
cluding a slide which is slotted for sliding engage
exert restraint on said hook when said inner cas
ment with a pin supported by said casing, a sec
ing is drawn from within said outer casing by a
ond pin carried by said slide, a hook pivotally
pull on the supporting line, a bearing surface on
mounted on said second pin and normally dis
the back of said hook for frictio-nally engaging
posed within said casing, said hook being held
said outer casing when the supporting cord ini
within said casing by contact with said casing,
tiates pull on said hook for extending said inner
but adapted to be rotated for releasing a line
and outer casings, and means cooperatively as
sociated with said inner and outer casings for 30 therefrom when said hook and slide have been
displaced lengthwise of said casing, a spring hav
holding said casings in extended position after a
ing one end anchored to said casing and its other
load has been supported by said device.
end secured to the back of said hook, and means
4. In a device of the character described, the
for locking said slide and casing in displaced rela
combination comprising an outer tubular casing,
‘
an inner casing intelescoping relation with said 35 tionship,
8. In a device of the character described, the
outer casing, means for limiting the amount of
combination comprising an outer casing and
extension of one of said casings to the other,
means for attaching a load to said outer casing,
means for attaching a load to said outer casing,
means within said outer casing whereby connec
means for attaching a supporting line to said
inner casing, said last-named means includ 40 tion is made between a supporting line and said
outer casing, said means including an inner cas
ing a hook pivotally supported from said in
ing which is slotted for sliding engagement with
ner casing, spring means having one end at
a pin supported by said outer casing, a second pin
tached to the back of said hook and its other
carried by said inner casing, a hook pivotally
end attached to said outer casing, said spring
» mounted on said second pin, a slot in said inner
means being normally ineffective to exert influ
casing for permitting the back of said hook to
ence on said hook when said casings are in closed
contact with said outer casing when said inner
telescoping relationship but eiiective on said hook
casing is within said outer casing, means on said
when said casings are extended from one another,
inner casing for preventing rotation of said hook
and means to hold said casings in extended rela-.
relative to said second pin when the inner casing
tionship after they have been extended by a pull
and hook are displaced relatively to the outer
on said hook.
casing, means for holding said inner casing in
5. ‘In a device of the character described, the
displaced relationship with respect to said outer
combination comprising a casing and means for
casing, and a spring connected to said hook and
attaching a load to the casing, means within said
casing whereby connection is made between a ’ to said outer casing for effecting force on said
hook when said hook and inner casing have been
supporting line and said casing, said means in
displaced relatively to said outer casing by a pull
eluding a-slide which is slotted for sliding en- on a supporting line attached to said hook, where
gagement with a pin supported by said casing, a
by when the pull of the supporting line on said
second pin carried by said slide, a hook pivotally
mounted on said second pin and normally dis 60 hook is slackened said hook is drawn from en
gagement with said rotation-preventing means
posed within said casing, a spring having one end
on said inner casing and rotated from hooking
anchored to said casing and its other end secured
ed to be extended to exert force on said hook
9.‘ In a device of the character described, the
when said hook and slide have been displaced 65 combination comprising an outer tubular casing,
means for attaching a load to said casing, an
lengthwise of said casing under pull thereon by
inner casing in telescoping relation to said outer
the supporting line and to cause pivoting of said
casing, a pair of bars secured to said inner cas
hook to release said supporting line when the pull
on said line is slackened, and means for holding
ing, a pin secured to said outer casing and ex
said slide in displaced relationship with respect 70 tending through longitudinal slots in said bars
and inner casing whereby the sliding of said
to said casing.
casings relatively to each other is limited, means
6. In a device of the character described, the
supported by said inner casing, a hook disposed
combination comprising a casing and means for
within said inner casing whereby a supporting
attaching a load to the casing, means within said
casing whereby connection is made between a 75 line may be hooked, said hook having an elon
2,410,816
.
'7
gated opening surrounding said last-named
means whereby said hook may be moved rela
tively to'said last-named means, and a spring
having one end attached to said hook and its
8
casing are displaced relatively to said outer cas
ing and to pivot said hook when restraint on said
hook is relieved, and means for holding said
inner casing displaced with respect to said outer
other end attached to said outer casing, said 5 casing.
spring being adapted to be tensioned to exert
LEONARD P. FRIEDER.
WALTER S. FINKEN.
force on said hook when said hook, bars and inner
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