EP0965483A2 - Elément de retard pour charge pyrotechnique - Google Patents

Elément de retard pour charge pyrotechnique Download PDF

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Publication number
EP0965483A2
EP0965483A2 EP99890091A EP99890091A EP0965483A2 EP 0965483 A2 EP0965483 A2 EP 0965483A2 EP 99890091 A EP99890091 A EP 99890091A EP 99890091 A EP99890091 A EP 99890091A EP 0965483 A2 EP0965483 A2 EP 0965483A2
Authority
EP
European Patent Office
Prior art keywords
piston
gas pressure
delay element
cylinder
acts
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.)
Withdrawn
Application number
EP99890091A
Other languages
German (de)
English (en)
Other versions
EP0965483A3 (fr
Inventor
Peter Schödlbauer
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.)
Hirtenberger Praezisionstechnik GmbH
Original Assignee
Hirtenberger Praezisionstechnik GmbH
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 Hirtenberger Praezisionstechnik GmbH filed Critical Hirtenberger Praezisionstechnik GmbH
Publication of EP0965483A2 publication Critical patent/EP0965483A2/fr
Publication of EP0965483A3 publication Critical patent/EP0965483A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19—Pyrotechnical actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/10—Delay devices or arrangements

Definitions

  • the present invention relates to a delay element, which is the effect of the gas pressure that occurs when a pyrotechnic Charge arises, distributed over a somewhat longer time, especially as a drive for adjusting neck supports in case of an accident.
  • Neck supports in the normal position a few centimeters away away from the head (6.5 cm is common). This has reasons of comfort: the headrest would be constantly on the head, it would be uncomfortable if the driver turns around, restrict the view.
  • the burning rate can be pyrotechnic Slow charges within certain limits by chemical additives, but this is for use with neck supports Delay not sufficient.
  • This task is accomplished by a delay element at the beginning mentioned type solved according to the invention in that the Gas pressure acts on a first piston, the one with its opposite one Face presses on hydraulic oil, which in turn acts on a second piston, being in the channel a restriction of the hydraulic oil is provided.
  • the hydraulic oil cannot because of its toughness and narrowing streaming too quickly; this is how the two move Piston at almost constant speed until it reaches the have run through the entire adjustment range. The speed can be varied by adjusting the constriction.
  • the gas pressure on a first piston acts on the opposite end face Compression spring supports with its other end on one second piston acts, this second piston in one second cylinder is airtight and in the second cylinder a damping hole is provided.
  • the two pistons can be different to move fast.
  • the first piston moves due to the gas pressure generated by the pyrotechnic charge very much quickly and thereby tension the spring.
  • the second piston moves now due to the spring force, but is replaced by the Overpressure that builds up in the second cylinder is damped.
  • the overpressure can only slowly pass through the damping hole dismantle, so that here you can choose any delay can be achieved. (The delay depends on the Size of the damping bore.)
  • FIG. 1 shows a hydraulic one Embodiment
  • Fig. 2 shows a mechanical embodiment by means of a spring.
  • a electric detonator 1 and a propellant charge 2 in one housing 2 'housed are a electric detonator 1 and a propellant charge 2 in one housing 2 'housed. If the electric igniter 1 is ignited, then the propellant charge 2 burns off. The resulting gases arrive through an opening 3 in the housing 2 'on the end face a first piston 5, which is displaceable in a first cylinder 4 is.
  • the space behind the first piston 5 is with Hydraulic oil 10 filled.
  • the gas pressure becomes the first Piston 5 shifted to the left and presses hydraulic oil 10 into a channel 6.
  • the channel 6 is with a second cylinder 8 in connection, in which a second piston 9 is displaceable is. Hydraulic oil 10 thus makes second piston 9 shifted to the right.
  • the second piston 9 has a larger cross-sectional area than the first piston 5. As a result, the second piston 9 moves slower than the first piston 5, so an additional Slowing the movement is achieved.
  • the gas pressure that arises when the propellant charge 2 burns off the first piston 5 is moved to the right and thereby the compression spring 12 tensioned.
  • a pawl 13 is provided which prevents the first piston 5 from moving back, once he has moved all the way to the right.
  • the second Piston 9 is then followed by the tensioned compression spring 12 moved to the right. His movement is hindered by that it is guided airtight in the second cylinder 8, so that an overpressure builds up to the right of the second piston 9.
  • the compressed air can only pass slowly through a damping hole 14 escape.
  • the dimensions of the damping bore 14 thus determine the speed at which the piston rod moves 11 moved to the right. Since the piston rod 11 the neck support The speed is also shifted forward the displacement of the headrest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Seats For Vehicles (AREA)
  • Automotive Seat Belt Assembly (AREA)
EP99890091A 1998-06-16 1999-03-11 Elément de retard pour charge pyrotechnique Withdrawn EP0965483A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT103398A AT405729B (de) 1998-06-16 1998-06-16 Verzögerungselement für pyrotechnische ladungen
AT103398 1998-06-16

Publications (2)

Publication Number Publication Date
EP0965483A2 true EP0965483A2 (fr) 1999-12-22
EP0965483A3 EP0965483A3 (fr) 2001-09-26

Family

ID=3505193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99890091A Withdrawn EP0965483A3 (fr) 1998-06-16 1999-03-11 Elément de retard pour charge pyrotechnique

Country Status (2)

Country Link
EP (1) EP0965483A3 (fr)
AT (1) AT405729B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006010562A3 (fr) * 2004-07-23 2006-04-27 Delphi Tech Inc Actionneur pyrotechnique
US10059577B2 (en) 2014-04-14 2018-08-28 Daicel Corporation Perforator and gas discharge apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826553A2 (fr) 1996-08-28 1998-03-04 TRW Occupant Restraint Systems GmbH Siège de véhicule à appui-tête, monté réglable sur le dossier

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2232726A1 (de) * 1972-07-04 1974-01-24 Volkswagenwerk Ag Sicherheitsvorrichtung
JPS4987971A (fr) * 1972-12-27 1974-08-22
DE3717458A1 (de) * 1987-05-23 1988-12-01 Diehl Gmbh & Co Pyrotechnisches kraftelement
FR2685741A1 (fr) * 1991-12-31 1993-07-02 Thomson Brandt Armements Verin pyrotechnique a course amortie.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826553A2 (fr) 1996-08-28 1998-03-04 TRW Occupant Restraint Systems GmbH Siège de véhicule à appui-tête, monté réglable sur le dossier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006010562A3 (fr) * 2004-07-23 2006-04-27 Delphi Tech Inc Actionneur pyrotechnique
US10059577B2 (en) 2014-04-14 2018-08-28 Daicel Corporation Perforator and gas discharge apparatus

Also Published As

Publication number Publication date
EP0965483A3 (fr) 2001-09-26
AT405729B (de) 1999-11-25
ATA103398A (de) 1999-03-15

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