| 摘要 |
<p>The drive shaft (10) of square cross section, as is used on electrical switch gear, is lengthened by a tubular extension (14). Since the shaft extension tube has a number of cross holes for the location of the tie bolts (17), the extension The coupling piece (12) which links the extension tube to the drive shaft has the same cross section as the shaft, and is attached to its front end. The coupling is made of a cross shaped sheet metal plate whose four members are bent at right angle to form a tubular bush of square cross section.</p> |
