with parts held relatively to each other by friction or gripping

Full Title

Props (in the building art E04G25/00); Chocks > Telescopic props (general means for fixing telescopic parts together ) > with parts held relatively to each other by friction or gripping

Child Classifications

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• E21D 15/285
• E21D 15/30 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 15/40 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 (friction linings or pads E21D15/42)