Component parts or details of props (E21D15/43, E21D15/58, E21D15/60 take precedence)

Full Title

Props (in the building art E04G25/00); Chocks > Component parts or details of props (E21D15/43, E21D15/58, E21D15/60 take precedence)

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• E21D 15/502 Prop bodies characterised by their shape, e.g. of specified cross-section
• E21D 15/51 specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
• E21D 15/52 Extensible units located above or below standard props (for allowing step-by-step movement of cap E21D23/06; setting props or chocks E21D15/58)
• E21D 15/54 Details of the ends of props (for permitting step-by-step movement E21D23/06)
• E21D 15/56 Details of locks of telescopic props