| 摘要 |
<p>A portable hot air gun has a handle assembly 1 on which are separately mounted a venturi tube 2 and a gas nozzle 9 directed into one end of the venturi tube which has at its other end a burner provided with an igniter operable from the handle assembly 1. The tube 2 leads via a diffuser 55 having radial vanes 60 into a fishtail-shaped combustion chamber 21 having a slot outlet 22, the burner being surrounded by a rectangular cage 20. The handle comprises a pistol grip 4 with a trigger 5 to open a gas valve (in housing 48) and to operate a piezo electric igniter unit 34. A second trigger (81), Figs. 4, 5 (not shown), may be provided to hold the first trigger in its depressed position. <IMAGE></p> |
