Precision pyrotechnic display system and method having increased safety and timing accuracy

• US 6,490,977 B1
• Filed: 03/30/1999
• Issued: 12/10/2002
• Est. Priority Date: 03/30/1998
• Status: Expired due to Term

• Current Assignee: Magicfire, Inc.
• Original Assignee: Magicfire, Inc.
• Inventors: Haase, Wayne C., Bossarte, George, Dillon, Glenn W., McKinley, Paul R., Nelson, Larry G.
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US09/281,203
• Time in Patent Office: 1,351 Days
• Field of Search: 102/200, 102/202.1, 102/202.2, 102/202.4, 102/206, 102/361, 102/342, 102/351, 102/357
• US Class Current: 102/342
• CPC Class Codes: F41A 19/58 Electric firing mechanisms F41A17/10, F41A17/12 take precedence
• CPC Class Codes: F41A 19/65 for giving ripple fire, i.e. using electric sequencer switches for timed multiple-charge launching, e.g. for rocket launchers
• CPC Class Codes: F42B 30/10 Mortar projectiles
• CPC Class Codes: F42B 4/00 Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes signalling by explosives G08B; advertising by fireworks G09F13/46; signalling by pyrotechnics in railway systems B61L5/20
• CPC Class Codes: F42B 4/02 in cartridge form, i.e. shell, propellant and primer
• CPC Class Codes: F42B 4/06 Aerial display rockets rockets in general F42B15/00
• CPC Class Codes: F42C 11/00 Electric fuzes in combination with other fuzes F42C9/14; proximity fuzes F42C13/00; safety or arming effected by electric means F42C15/40; electric contact parts for fuzes F42C19/06; electric igniters F42C19/12, F42B3/12 - F42B3/18; optical initiators F42B3/113
• CPC Class Codes: F42C 11/001 Electric circuits for fuzes characterised by the ammunition class or type F42C11/02 - F42C11/06 take precedence; mechanical fuzes having electric igniters for hand grenades or marine warheads F42C14/025, F42C14/045
• CPC Class Codes: F42C 11/008 Power generation in electric fuzes F42C11/02, F42C11/04 and F42C15/295 take precedence
• CPC Class Codes: F42D 1/05 Electric circuits for blasting
• CPC Class Codes: F42D 1/055 specially adapted for firing multiple charges with a time delay

Abstract

A system and method are disclosed for controlling the launch and burst of pyrotechnic projectiles in a pyrotechnic, or “fireworks”, display.

Claims

1. An ignitor for a pyrotechnic projectile of the sort comprising a lift charge to be ignited by an electrically operated lift charge ignition device to launch the pyrotechnic projectile, and a break charge to be ignited by an electrically operated break charge ignition device to burst the pyrotechnic projectile, said ignitor comprising:

electronic control means adapted to be carried by the pyrotechnic projectile and for receiving an electronic fire command from an external control device and, in response thereto, (1) activating said electrically operated lift charge ignition device so as to launch the pyrotechnic projectile and the ignitor, and (2) a pre-determined time after receiving said electronic fire command, activating said electrically operated break charge ignition device so as to burst the pyrotechnic projectile.

2. An ignitor according to claim 1 wherein said electronic control means further comprise:

means for preventing transient voltages from unintentionally activating said electrically operated lift charge ignition device and said electrically operated break charge ignition device.

3. An ignitor according to claim 1 wherein said electronic control means further comprise:

means for ensuring that the polarity of said electronic control means is matched to the polarity of said external control device.

4. An ignitor according to claim 1 wherein said electronic control means comprise:

a first output connecting said ignitor to said electrically operated lift charge ignition device;

a second output connecting said ignitor to said electrically operated break charge ignition device;

a power supply for selective connection to said first output and said second output for selectively activating said electrically operated lift charge ignition device and said electrically operated break charge ignition device, respectively; and

a timer for determining when said power supply activates said electrically operated break charge ignition device.

5. An ignitor according to claim 4 wherein said power supply comprises at least one capacitor.

6. An ignitor according to claim 4 wherein said timer comprises a resistor/capacitor combination.

7. An ignitor according to claim 4 wherein said timer comprises a crystal.

8. An ignitor according to claim 4 wherein said timer is accurate to within 0.001 seconds.

9. An ignitor according to claim 1 wherein said electronic control means further comprise:

means for monitoring the status of said electrically operated lift charge ignition device and said electrically operated break charge ignition device.

10. An ignitor according to claim 1 wherein said electronic control means further comprise:

means for sensing a failure to achieve a proper launch of said pyrotechnic projectile and, upon sensing such a failure, preventing activation of said electrically operated break charge ignition device.

11. A pyrotechnic projectile comprising:

a lift charge to launch the pyrotechnic projectile;

an electrically operated lift charge ignition device for activating said lift charge;

a break charge to burst the pyrotechnic projectile;

an electrically operated break charge ignition device for activating said break charge; and

an ignitor carried by the pyrotechnic projectile and comprising electronic control means for receiving an electronic fire command from an external control device and, in response thereto, (1) activating said electrically operated lift charge ignition device so as to launch the pyrotechnic projectile, and (2) a pre-determined time after receiving said electronic fire command, activating said electrically operated break charge ignition device so as to burst the pyrotechnic projectile.

12. A pyrotechnic projectile system comprising:

a pyrotechnic projectile and an external control device;

said pyrotechnic projectile comprising;

a lift charge to launch the pyrotechnic projectile;

an electrically operated lift charge ignition device for activating said lift charge;

a break charge to burst the pyrotechnic projectile;

an electrically operated break charge ignition device for activating said break charge; and

an ignitor carried by the pyrotechnic projectile and comprising electronic control means for receiving an electronic fire command from said external control device and, in response thereto, (1) activating said electrically operated lift charge ignition device so as to launch the pyrotechnic projectile, and (2) a pre-determined time after receiving said electronic fire command, activating said electrically operated break charge ignition device so as to burst the pyrotechnic projectile.

13. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for detecting if said ignitor of said pyrotechnic projectile is connected to said external control device.

14. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for communicating with said ignitor.

15. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for detecting a fault in said ignitor and, upon detection of the same, deactivating said ignitor.

16. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for providing a calibration signal to said electronic control means.

17. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for detecting a fire command from an external user interface and, upon detection of the same, issuing an electronic fire command to said ignitor.

18. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for detecting if said pyrotechnic projectile has properly launched in response to receiving said electronic fire command and, if not, for disabling said pyrotechnic projectile.

19. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

an interface module adapted to be connected to a manual control panel.

20. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

an interface module adapted to be connected to a computer.

21. A pyrotechnic projectile system according to claim 12 wherein:

said system comprises multiple pyrotechnic projectiles, said system comprises a port, and further wherein multiple pyrotechnic projectiles are connected to said port, each of said pyrotechnic projectiles being separately controllable by said system.

22. A pyrotechnic projectile system according to claim 21 wherein said system is adapted to detect when the number of pyrotechnic projectiles connected to said port exceed a predetermined number.

23. A pyrotechnic projectile system according to claim 12 wherein said pre-determined time is pre-programmed into said ignitor.

24. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for programming said pre-determined time into said ignitor.

26. A pyrotechnic projectile system according to claim 12 further comprising:

a second pyrotechnic projectile comprising;

a lift charge;

an electrically operated lift charge ignition device;

a break charge;

a fuse for activating said break charge, said fuse being activated by said electrically operated lift charge ignition device.

27. A pyrotechnic projectile system according to claim 12 wherein said external control device comprises:

means for detecting a fault in said ignitor and, upon detection of the same, providing notification to the system operator.

28. A pyrotechnic projectile system according to claim 16 wherein said calibration signal is a time calibration signal.

29. A pyrotechnic projectile system according to claim 18 wherein said external control device further comprises:

means for notifying the system operator if said pyrotechnic projectile is disabled.

30. A pyrotechnic projectile system according to claim 26 wherein said system is adapted to detect when the total number of said pyrotechnic projectiles and said second pyrotechnic projectiles connected to said port exceed a predetermined number.

25. A pyrotechnic projectile system comprising:

a plurality of pyrotechnic projectiles and an external control device;

each of said pyrotechnic projectiles comprising;

a lift charge to launch the pyrotechnic projectile;

an electrically operated lift charge ignition device;

a break charge to burst said pyrotechnic projectile; and

a fuse for activating said break charge, said fuse being carried by the pyrotechnic projectile and being activated by said electrically operated lift charge ignition device;

said external control device comprising a port, with said plurality of pyrotechnic projectiles being connected to said port, and said external control device being adapted to detect when the number of said pyrotechnic projectiles connected to said port exceed a predetermined number.