| 摘要 |
A burner for attachment to and forming a part of a planter which places pre-germinated seeds combined with soil and a gel into a seed bed covered by a plastic film of thermoplastic material with the burner serving to form a hole through the plastic film and form a cavity in the seed bed. The burner is in the form of a hollow burner housing provided with peripheral discharge apertures for exhaust products resulting from combustion of burnable gases interiorly of the burner. The burner is generally cylindrical in configuration with the lower end provided with a tapering rounded nose generally in the shape of a bullet to facilitate penetration of the plastic film when the burner is heated and also facilitate the formation of a cavity in the seed bed. To protect the discharge openings for the exhaust products against various adverse climate conditions and the like, a peripheral shield is provided for the discharge apertures for the combustion products with the shield being disposed in outwardly spaced relation and closed at the top but open at the bottom to enable the combustion products to move downwardly along the outer surface of the burner thereby enhancing the heating of the burner by the combustion products which not only engage the inner surface of the burner but also partially engage the outer surface thereof.
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