Duct for dust extractor - has rotary joint formed of two T=shaped fittings with locking teeth

摘要

The dust extraction duct includes a rotary joint formed by two identical TEE-shaped tubular fittings (14,15). On adjacent ends (25,26), the two fittings are provided with circular inserts with axiallylocated teeth profiles (23,24). When assembled, the teeth profiles provide anti-rotation locking between the two fittings. Two screw shafts (20,21) with external end plates (27,28) can be screwed into captive nuts (29,30) on both ends of a coil spring (19) to secure the two fittings at any required angular position. ADVANTAGE - Adjustable pivot fitting for dust extraction duct is provided with improved locking to maintain angular position.