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PORTABLE HEAT GUN

  • US 3,612,824 A
  • Filed: 12/03/1969
  • Issued: 10/12/1971
  • Est. Priority Date: 12/03/1969
  • Status: Expired due to Term
First Claim
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1. A portable heat gun comprising:

  • a. a frame;

    b. an air blower mounted on said frame including a rotor and a casing having an air intake port and a tubular air discharge spout to direct air forwardly in a predetermined direction;

    c. a tubular collar mounted on and encompassing the forward end of said tubular spout in spaced relation to define a substantially annular channel for the flow of ambient air therethrough;

    d. a forwardly converging frustoconical member mounted on the forward end of said tubular collar and having a plurality of apertures extending through the converging walls of said member in said forward direction;

    e. a heater tube mounted on the forward end of said converging member, said tube extending forwardly to a hot air discharge end;

    f. electrical heating means mouNted in said heater tube for heating the air entering said tube from said blower discharge spout and said annular channel less the air flowing through said apertures; and

    , g. a tubular shield encompassing said heater tube and forming therewith an annular passageway for the flow therethrough of air passing through said apertures and moving forwardly in said predetermined direction to emerge from the open forward end of said passageway in an annular flow pattern encompassing the hot air emitted from said air outflow from said heater tube, the air flow from said discharge spout being effective to induce the flow of ambient air through said annular channel and along the adjacent surface of said apertured frustoconical member, said ambient air flow helping to maintain the temperature of said tubular collar at ambient conditions.

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