US3598343A - Pyrotechnic device for release of parachute central shroud - Google Patents

Pyrotechnic device for release of parachute central shroud Download PDF

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Publication number
US3598343A
US3598343A US886702A US88670269A US3598343A US 3598343 A US3598343 A US 3598343A US 886702 A US886702 A US 886702A US 88670269 A US88670269 A US 88670269A US 3598343 A US3598343 A US 3598343A
Authority
US
United States
Prior art keywords
parachute
support
substance
combustible substance
release
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US886702A
Other languages
English (en)
Inventor
Eugene Robert Gencey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Direction General de lArmement DGA
Gouvernement de la Republique Francaise
Original Assignee
Gouvernement de la Republique Francaise
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gouvernement de la Republique Francaise filed Critical Gouvernement de la Republique Francaise
Application granted granted Critical
Publication of US3598343A publication Critical patent/US3598343A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D17/00—Parachutes
    • B64D17/40—Packs
    • B64D17/52—Opening, e.g. manual

Definitions

  • the central shroud is soldered to a knockofi ring held in place by a low-tensile retaining pin.
  • the solder also supports a pronged firing pin in front of which is a priming compound, preferably slightly gaseous, which ignites through impact and friction and is able to melt the solder,
  • the priming compound may be composed of a mixture of zirconium and lead chromate.
  • PYROTECHNIC DEVICE FOR RELEASE OF PARACIIUTE CENTRAL SIIROUD BACKGROUND Parachutes are in wide use in the distribution of military supplies and for slowing the descent of flares and smoke generators.
  • parachute efficiency is a compromise between the required falling velocity and the resistance of the parachute. The greater its resistance the less the falling velocity, everything else being equal. However, the larger the parachute the greater the forces acting on it, particularly at the instant of unfurling.
  • Another procedure is to use a central shroud which reduces the parachute unfurling coefficient during its first few yards of travel.
  • the force on the parachute when it opens can be cut down as much as 50 percent.
  • the central shroud must be released by a suitable procedure so that the parachute may assume its full contour to secure the required rate of descent.
  • delayed-action pyrotechnic shearing the pyrotechnic lag being initiated by a pullout charge or by the firing compound of the flare or smoke generator.
  • FIG. I is a sectional view through a diameter of a device parachute.
  • a central shroud l is made fast to a knockoff ring 2 and a pronged striker 3 by solder 4. The whole is held against case 5 by a safety device such as, for example, a keeper 6 which yields to a specific force of small magnitude.
  • the method according to the invention can be employed for any high-speed parachute release, especially with flares or smoke generators, and parachute missiles for probe recovery after acceleration test.
  • WI-IAT ICLAIM IS
  • a delayed release device comprising a support, a combustible substance on said support, first means normally spaced from but adapted to engage said substance and ignite the same, second means to apply a displacement force to said first means to bring the latter into engagement with said combustible substance, and a fusibl substance connecting said first and second means and displaceable with the same and to a position adjacent the combustible substance to be melted by the combustible substance when the latter has been ignited whereby the second means is separated from the first means.
  • a device as claimed in claim I comprising a first member attached to said second means, and a second member, adapted for being broken by application of a force thereto, fixing the first said member to the support and adapted for being broken by said force to release said first member and thereby said second means for movement relative to said support and combustible substance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Emergency Lowering Means (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Air Bags (AREA)
US886702A 1968-12-19 1969-12-19 Pyrotechnic device for release of parachute central shroud Expired - Lifetime US3598343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR179259 1968-12-19

Publications (1)

Publication Number Publication Date
US3598343A true US3598343A (en) 1971-08-10

Family

ID=8658639

Family Applications (1)

Application Number Title Priority Date Filing Date
US886702A Expired - Lifetime US3598343A (en) 1968-12-19 1969-12-19 Pyrotechnic device for release of parachute central shroud

Country Status (9)

Country Link
US (1) US3598343A (da)
BE (1) BE741912A (da)
DE (1) DE1963437A1 (da)
DK (1) DK129920B (da)
FR (1) FR1595413A (da)
GB (1) GB1259904A (da)
LU (1) LU60037A1 (da)
NL (1) NL6918908A (da)
NO (1) NO122631B (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102785779A (zh) * 2012-08-23 2012-11-21 余自玄 一种主动展开式降落伞

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY138164A (en) 2005-03-15 2009-04-30 Univ Malaya Glycolipids of branched chain alkyl oligosaccharides for liquid crystal and related applications

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1385637A (fr) * 1963-12-06 1965-01-15 Centre Nat Rech Scient Procédé et dispositif propres à provoquer la réouverture immédiate d'un parachute initialement en torche
US3222014A (en) * 1964-03-02 1965-12-07 Short Brothers & Harland Ltd Parachute braking apparatus for aircraft
US3348793A (en) * 1965-10-18 1967-10-24 Aerospace Res Corp Means for attaching reefing line cutter to load carrying parachutes
US3408026A (en) * 1967-10-24 1968-10-29 Aerospace Systems Company Variable time delay reefing line cutter
US3452631A (en) * 1967-04-17 1969-07-01 Atlas Chem Ind Reefing line cutter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1385637A (fr) * 1963-12-06 1965-01-15 Centre Nat Rech Scient Procédé et dispositif propres à provoquer la réouverture immédiate d'un parachute initialement en torche
US3222014A (en) * 1964-03-02 1965-12-07 Short Brothers & Harland Ltd Parachute braking apparatus for aircraft
US3348793A (en) * 1965-10-18 1967-10-24 Aerospace Res Corp Means for attaching reefing line cutter to load carrying parachutes
US3452631A (en) * 1967-04-17 1969-07-01 Atlas Chem Ind Reefing line cutter
US3408026A (en) * 1967-10-24 1968-10-29 Aerospace Systems Company Variable time delay reefing line cutter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102785779A (zh) * 2012-08-23 2012-11-21 余自玄 一种主动展开式降落伞
CN102785779B (zh) * 2012-08-23 2015-09-02 余自玄 一种主动展开式降落伞

Also Published As

Publication number Publication date
GB1259904A (en) 1972-01-12
DK129920B (da) 1974-12-02
NO122631B (da) 1971-07-19
NL6918908A (da) 1970-06-23
BE741912A (da) 1970-05-04
LU60037A1 (da) 1970-03-18
DE1963437A1 (de) 1970-11-26
FR1595413A (da) 1970-06-08
DK129920C (da) 1975-05-12

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