Portable smoke generator

• US 4,547,656 A
• Filed: 04/09/1984
• Issued: 10/15/1985
• Est. Priority Date: 04/09/1984
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Swiatosz, Edmund, Grimmer, Paul D.
• Primary Examiner(s): Envall, Jr., Roy N.
• Assistant Examiner(s): Lateef, M. M.
• Application Number:
  US06/597,892
• Time in Patent Office: 554 Days
• Field of Search: 219/300, 219/296, 219/272, 219/273, 219/275, 219/304, 219/305, 252/359 CG, 252/305, 252/359 R, 43/127, 434/226, 426/314, 426/315, 426/312, 426/232, 99/467, 99/471, 99/473, 99/475, 99/476, 99/481, 99/482
• US Class Current: 392/397
• CPC Class Codes: F41H 9/06 Apparatus for generating artificial fog or smoke screens for producing special effects on stages A63J5/00; smoke-pot projectors, e.g. arranged on vehicles, F42B5/155
• CPC Class Codes: H05B 3/46 heating conductor mounted on insulating base

Abstract

A resistance tube type smoke generator utilizes a plurality of tube secti, each having a distinct cross-sectional area and electrical resistivity to provide both storage and vaporization via prolonged differential heating of a smoke producing agent. Thermal control may be exercised by sensing change in resistivity of the entire tube or by thermostatic sensors attached to the tubing sections.

Claims

1. An apparatus for generating smoke, comprising in combination:

electrically conductive tubing configured as a coil and having a plurality of sections having distinct I² R heating properties and cross-sectional areas;

means for applying an electric current across the length of said tubing;

housing means for containing said tubing having a first aperture communicating with said tubing for discharge of smoke and a resealable aperture communicating with said tubing for insertion of smoke producing liquids, said housing providing electrical and thermal insulation about said tubing;

a destructable relief disk located in said first aperture providing means for discharging smoke; and

means for controlling the temperature of said tubing operably connected thereto.

2. The apparatus of claim 1 wherein said electrically conductive tubing comprises:

a heater section communicating with said first aperture, having a high electrical resistance and a cross-sectional area smaller than the remainder of said tubing;

a storage section serially communicating at one end with said heater section, having a low electrical resistance and a cross-sectional area larger than the remainder of said tubing; and

a pump section communicating with said resealable aperture and serially connected to said storage section, having electrical resistance and cross-sectional area intermediate said heating and storage section.

3. The apparatus of claim 2 wherein said means for applying an electric current comprises:

an alternating current input line adaptively configured to receive an alternating electrical current providing a current path serially through said pump section, storage section, and heater section.

4. The apparatus of claim 3 wherein said means for controlling the temperature of said tubing comprises a thermostat operably connected to open said current path in response to the temperature of said heater coil.

5. The apparatus of claim 3 wherein said means for controlling the temperature of said tubing comprises means for dynamically sensing the variation in resistivity of tubing as a function of temperature and interrupting current flow thereto in accordance with a predetermined temperature level, operably connected to sense resistivity variations along the entire tube.

6. The apparatus of claim 5 wherein said means for controlling the temperature of said tubing futher comprises means for varying said predetermined temperature level, operably located distal to said tubing.

7. The apparatus of claim 2 wherein said means for applying an electrical current comprises an AC input line providing a parallel current path across said pump section and said heater section, said AC line being connected to said tubing at the center of said storage line and at the ends of said pump and heater sections distant thereto.

8. The apparatus of claim 7 wherein said means for controlling the temperature of said tubing comprises:

a first thermostat operably connected to sense the temperature of said pump section and to interrupt the current path therethrough in accordance with a predetermined temperature level; and

a second thermostat operably connected to sense the temperature of said heater section and to interrupt the current path therethrough in accordance with a predetermined temperature level.

9. The apparatus of claim 2 wherein said housing means comprises:

an enclosure tube for containing said tubing and said temperature controlling means;

a filler end plate operably connected to said enclosure tube, having means for providing electrical connections and having a central aperture containing a threaded sleeve connected to said pump section;

a filler end plate threadably mated to said threaded sleeve;

a filler end enclosure detachably affixed to said filler end plate covering said filler end plate and said electrical communicating means, having an aperture therethrough for provision of electrical power;

an orifice end plate affixed to said enclosure tube having an orifice communicating with said heater section;

relief disk retaining means affixed to said orifice end plate; and

orifice end enclosure detachably affixed to said orifice end plate having an aperture therethrough for the discharge of smoke.

10. The apparatus of claim 1 further comprising means for urging smoke producing agent through said tubing towards said first aperture.

11. The apparatus of claim 10 further comprising a reservoir for containing a smoke producing fluid, operably connected to said tubing to admit fluid thereto in response to said urging means.

12. The apparatus of claim 11 wherein said means for urging comprises a spring driven piston, located within said reservoir and compressed by the induction of said smoke agent.