with parts held relatively to each other by friction or gripping, e.g. using wedges

Full Title

Props; Chocks > Telescopic props > with parts held relatively to each other by friction or gripping, e.g. using wedges

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS

Child Classifications

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• E21D 15/3 by means expanded or contracted by pressure applied through the medium of a fluid or quasi-fluid, e.g. rubber
• E21D 15/32 by a deformable collar
• E21D 15/34 by axially-moving balls, rollers, or the like
• E21D 15/36 by a tiltable collar surrounding one or both parts
• E21D 15/38 with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations
• E21D 15/4 Collar or other support gripped to one or both parts by toggle-action, cam, or other member pivoted or similarly mounted
• E21D 15/42 with special parts to influence the friction
• E21D 15/43 Details of wedges