E21D15/28 - CPC Classification

Props ; Chocks, e.g. made of flexible containers filled with backfilling material; Telescopic props with parts held relatively to each other by friction or gripping

• E21D15/285 » {by means of wedges or wedge combinations } 2
• E21D15/30 » by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber 1
• E21D15/32 » by a deformable collar {or clamping means applied symmetrically inside a locking ring} 2
• E21D15/34 » by axially- moving balls, rollers, or the like 0
• E21D15/36 » by a tiltable collar surrounding one or both parts 0
• E21D15/38 » with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations 0
• E21D15/40 » Collar or other support gripped to one or both parts by toggle-action, cam, or other member pivoted or similarly mounted 2
• E21D15/42 » with special parts to influence the friction 0
• E21D15/43 » Details of wedges 2

Recent Application in this class: