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Патент USA US2404672

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Juiy 23, 194%.
c. A. V_OLF
'VENTED PARACHUTE
Filed May 21, 1942
. 294%},672
2 Sheets-Sheet l
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c. A. VOLF
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VENTED PARACHUTE
Filed May 21, 1942
2 ShéetS-Sheet 2
cwmw 77AM ‘mi/Qua
Patented July 23, 1946
2,404,672
‘UNITED STATES * PATENT ‘ OFFICE‘ ‘t:
2,404,672 .
VEN TED PARACHUTE
Christian A. Volf, Los'Angeles, Calif.
Application May 21, 1942, Serial No." 443,960
6 Claims. (Cl. 2444-142)
, 1
This invention is a parachute, provided with
vents opening automatically to relieve excess pres
sure existing below the canopy of the parachute.
‘Parachutes provided with vents have hereto
fore been proposed as, for example, in the pat
ent, t0 Malmer 1,777,441, dated October 7, 1930,“
and Tricau 1,862,247, dated June '7, 1932.‘ How
ever, I have found that if some‘ or all of the
panels forming the canopy are provided with
diagonally‘ extending, automatically opening
vents, the performance of the parachute is great
1y improved.
'
‘
.
In the preferredhform of the invention, the
diagonal‘ vents are arranged in'end-to-end for
mation‘, thereby forming a zig-zag row extend
ing laterally around the canopy. In another
form 'ofthe invention, only every other panel is
provided with a vent, the intermediate panels
being of standard construction. ‘
apex of the chute, which" apex is provided with
the usual air escape opening 8.
Each panel 4 is provided intermediate its ends
with a diagonally extending vent I0. Considered
in plan, as in Fig. 1, the vents [0 are approxi
mately at 45° with respect to the lines 6. How
ever, this angle may be varied, as desired. Each
vent is formed by providing adjacent edges of
the panel which de?ne the vent with a suitable
reinforcement I2,.as by a strong hem which may
enclose a reinforcing cord, the ends of which"
are secured to the cords 6 of the respective pan
els. The edges of‘the vent are usually fairly
close
together.
-
h
,
'The vents are arranged in end-to-end' forma
tion and thereby form a zig-zag row extending
around the parachute, as shown in Figs.‘ 1 and 2.
Shroud lines M of the usual type connect to
the harness 16 for the parachutist.
,As' noted above, the vents open .automatically 20 Other shroud lines I5‘, secured at their upper
to relieve excess air pressure existing below the
ends as at l5’, are secured to a ringll; from
parachute; This property is particularly valu
this ring heavy elastic straps I 9 extend to the
able at the moment of opening the‘ chute, which
harness I6. Cords [5 are particularly useful
opening ordinarily gives quite a shock to the
in openingv therchute; they are tensioned .be
parachutist, due to the sudden checking of the 25 fore
the cords M are tensioned, because of the
descent. This shock is considerably lessened, ac
contraction of elastic cords l9 and ?atten the
cording to this invention, by the use of the de
center of the chute and so aid in opening it.
scribed vents, which allow excess‘ air pressure
Referring to the modi?cation shown in Fig. 5,
to escape progressively as the pressure builds
every other panel I8 is provided with a vent 20,
up. The vents progressively close at the pressure 30 the vents in plan being angularly positioned at
decreases, so that the checking of the parachutist
about 45° to the lines 6, the vents preferably
is distributed over a longer time and therefore
being arranged all at the same angle. The inter
there is less shock.
mediate panels 22 are not provided with vents.
Furthermore, a parachute provided with the
By reason of the use of diagonal vents, there
vents as described oscillates less and descends ' is formed an air escape zone Z, of substantial
more nearly vertically, that is, with less lateral
horizontal area, extending both radially and cir
cumferentially of the canopy, this zone Z being
de?ned between concentric circles Z1 and Z2 pass
.ing approximately
the outer and inner
40 ends of the vents IDthrough
feet a second.
or 20, Figs. 1 and 5.
.The invention will be further described in
The described vents will open readily when the
connection with the accompanying drawings, in
air pressure existing below the canopy" exceeds
which
‘
a certain amount. This opening is progressive,
Fig. 1 is a, plan view of a parachute accord
45 in that the greater the pressure, the greater
ing to this invention;
the opening. This is particularly valuable in
Fig. 2 is a. side view;
easing the shock of descent, the vents opening
.Wide when the parachute is ?rst opened and
Fig. 3 is an enlarged fragmentary View of a
detail;
.
therefore descending very rapidly. As the chute
Fig. 4 is a perspective view showing the para 50 spreads the vents are wide open and. so the
descent is not checked too suddenly. As the para
chute just after landing; and
chute slows down, the pressure decreases and
Fig. 5 is a plan view of a modi?cation.
the vents gradually close, until a normal rate of
In these drawings, the canopy 2 is composed
descent is reached.
'
of a number of triangular panels 4, de?ned by
The
chute
of
the
present
invention also de
load lines or cables 6, which converge to the 55
scends with very little lateral drift and after
drift than with the ordinary parachute. It opens
very quickly and even with varying loads its rate
of descent does not vary more than about ?ve
2,404,672
landing can be quickly collapsed so that the
chutist is not dragged along the ground.
While the preferred embodiments of the in
vention have been described in some detail, it
should be understood that the invention is not
limited to such details, but may be carried out
in other ways.
I claim as my invention:
1. A parachute comprising a canopy composed
4
4. A parachute comprising a canopy includ
ing panels de?ned by upwardly converging load
lines, said canopy being provided with diagonally
extending air escape vents extending diagonally
from one load line to the next adjacent loadv line
positioned intermediate the outer edge and the
apex said vents being arranged in end-to-end
formation to form a zig-zag row extending cir- .
cumferentially around the canopy, shroud lines
extending from the outer edge of the canopy to
of panels, de?ned by upwardly converging load 10 a'body
harness, additional shroud lines attached
lines, certain panels being provided with diag
to the underside of the canopy at points adjacent
onally extending vents extending diagonally from
one load line to the next adjacent load line, posi
tioned between the apex and the outer edge there
said vents, and extending to a ring above said
harness, and means attaching said ring to said
of, which vents open and close automatically 15 .harness.
5. A parachute comprising a canopy including
and gradually upon increase and decrease of air
pressure below the parachute said Vents form
ing a pressure relief zone extending both radially
and circumferentially with respect to the canopy.
panels de?ned by upwardly converging load lines,
said canopy being provided with diagonally ex
tending air escape vents extending diagonally
2. A parachute comprising a canopy having a 20 from one load line to the next adjacent load line
positioned intermediate the outer edge and the
central opening at the apex thereof, the canopy
being composed of triangular panels de?ned by
reenforcing load lines converging to said central
opening, each panel being provided with a d-iag
apex said vents being arranged in end-to-end
formation to form a zig-zag row extending cir-v
cumferentially around the canopy, shroud lines
extending from the outer edge of the canopy to
onally extending vent extending between adja 25
a body harness, additional shroud lines attached
cent pairs of said load lines, said vents being
to the underside ‘of the canopy 'at' points adja
arranged in end-to-end formation to form a
cent said vents, and extending to a ring above
zig-zag frow extending circumferentially around
said‘harnes's, and elastic means for attaching said.‘
the canopy, said vents opening automatically to
‘relieve excess air pressure existing below the
ring to said harness.
'
'
6. A parachute comprising a canopy having a
canopy.
central opening at the apex thereof,‘ the canopy
being'composed of' triangular panels de?ned by
lines and having a central opening at the apex
reen'forcing load lines converging to .said central
"3. A parachute comprising a canopy composed
of panels de?ned by upwardly converging load
opening, every other panel being provided with a
thereof, every other panel, between its outer
diagonally extending vent extending between ad!
and inner ends, being provided with a diagonal
jacent pairs of load lines, ‘said vents extending
ly extending vent extending diagonally from one
around the canopy,‘ said vents
load line to the next adjacent load line, all said , circumferentlally
opening automatically to relieve excess air pres
vents being positioned ‘in the same relative angu
existing below the canopy said vents‘ form
lar position in their respective panels, ‘said vents 40 sure
ing a'pre'ssure relief zone extending .both radially
opening‘ and closing automatically upon increase
and circurnferentially with respect to the canopy.
and decrease of air pressure below the parachute
said vents ‘forming a pressure relief zone extend
CHRISTIAN A. VOILE‘;
ing both radially and circumferentially with re
spect' to the canopy.
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