IPC Subgroup
E21D 15/24 with axial screw-and-nut, rack-and-worm, or like mechanism
Introduced: September 1968
Last revised: January 2006
Full Title
Props; Chocks > Telescopic props > with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure > with axial screw-and-nut, rack-and-worm, or like mechanism
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
1 direct subcode
Child Classifications
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- E21D 15/26 with screw, worm, or the like not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure