Tubing for height-adjustable support has base part, thread part with exterior thread and smooth interior and tapering part inbetween base and thread parts serving as fail-safe device for inner tube; height-adjustable support
摘要
<p>Outer or standing tube (12) for building support has a base part (18) a threaded part (16) with exterior thread whose inner surface is largely even and tapering serving as fail-safety for an inner tube (10). Both thread part and tapering are made of a piece with the base part. The tapering is situated at the intersection between base and thread parts. A slit (14) extends along the length of the tube through which a pin can be pushed.</p>
