Патент USA US2404672код для вставки
Juiy 23, 194%. c. A. V_OLF 'VENTED PARACHUTE Filed May 21, 1942 . 294%},672 2 Sheets-Sheet l > 3W3’ 23» 3946*: c. A. VOLF gamma 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.