Non-explosive linear release device

• US 5,611,567 A
• Filed: 12/18/1995
• Issued: 03/18/1997
• Est. Priority Date: 12/18/1995
• Status: Expired due to Fees

• Current Assignee: Cartridge Actuated Devices, Inc.
• Original Assignee: Cartridge Actuated Devices, Inc.
• Inventors: Hoo, Edward S.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US08/572,899
• Time in Patent Office: 456 Days
• Field of Search: 280/737, 280/741
• US Class Current: 280/737
• CPC Class Codes: B60R 21/268 using instantaneous release of stored pressurised gas B60R21/26005 takes precedence
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators
• CPC Class Codes: F16K 13/06 constructed to be ruptured by an explosion

Abstract

A non-explosive pyrotechnic linear release device is comprised of a body within which, at a proximal end, a pyrotechnic, comprised of a compressed gasless ignition powder, is contained behind a support ram which extends forward from the distal end of the body to support the sealed exit end of a pressure container which has been charged with a fluid, preferably air. The compressed pyrotechnic provides a psi pressure against the proximal end of the support ram greater than the psi pressure of the fluid against the sealed exit end of the pressure container. When the pyrotechnic is ignited by signal from an impact detecting element in the automobile during a crash, the pressure provided by the compacted pyrotechnic is dissipated, the support ram is then pushed proximally by the pressure from the pressure container and the exit end of the pressure container becomes unsealed and releases the fluid under pressure to the air bag or bags provided in the automobile.

Claims

1. A linear non-explosive pyrotechnic device for use in combination with a pressure container for releasing gas from an exit end of the pressure container in which the gas is contained under a pressure to offer resistance of predetermined psi sufficient to open a seal enclosing the exit end of the container, said device comprising a hollow cylindrical body having a bore extending along a center axis from a proximal end of said body to a distal end of said body, a pyrotechnic contained within said bore adjacent said proximal end, said pyrotechnic comprising a powder positioned and compressed to offer linear resistance along said center axis of predetermined psi in excess of the pressure under which the gas in the container is contained, a ram extending along said center axis and abutting said pyrotechnic with a proximal end, said ram extending past said distal end of said cylindrical body to a distal end, said distal end of said ram comprising means for abutting the seal enclosing the exit end of the container and for maintaining pressure against the seal derived from the abutment of said ram against said pyrotechnic, means for igniting said pyrotechnic, said pyrotechnic comprising means for diminishing in volume when ignited, said ram being slidable in said hollow cylindrical body and comprising means for moving toward said proximal end of said cylindrical body under force of the pressure in the container when said pyrotechnic is ignited and diminished in volume, and means directing the gas from the container axially with respect to said body.

2. The device of claim 1 wherein said ram comprises a primary ram having a bore and a secondary ram slidable in said primary ram and said device further comprises a second pyrotechnic contained in said bore in said primary ram and abutting a proximal end of said secondary ram, a distal end of said secondary ram constituting said distal end of said ram comprising means abutting the seal enclosing the exit end of the container.

3. The device of claim 2, further comprising separate means for igniting said second pyrotechnic.

4. The device of claim 1 in combination with means for directing gas released from the container over and axially relative to said device.

5. The device of claim 4, including heat transfer means for heating the gas released from the container as it passes over said device.