| 摘要 |
<p>An improved torch assembly (10) designed for use in the formation of roof lap joints even in cold weather is provided which includes an elongated handle (12) having a low profile torch head assembly (17) secured thereto. The assembly (17) has a drag shoe (14) adapted to receive a torch head (16) and direct combustion products through a rearward outlet opening (54). Minimal torch head assembly height is provided so as to avoid cracking of stiff lap weld material during cold weather use, and is achieved through use of an elongated, rectangular in cross section torch head (16) which fits between upper and lower walls (24, 32) forming a part of shoe (14); the head (16) has a number of large area air inlets (74) owing to its rectangular configuration, allowing generation of sufficient heat to give lap welds of high integrity.</p> |
