Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
"Atlas" hydraulic pit prop
Prop cylinder is fully armored against impact and abrasion by sandwich combination of steel sheathing and polyvinyl chloride filler; prop is extended and set by pumping; pump handle is engaged on inset square shank and until prop head meets resistance of half ton; each stroke extends prop 1 in.; at half ton loading low pressure piston disengages and high pressure operation takes over; this transition is absolutely positive and mechanically controlled.
"Atlas" hydraulic pit prop
Prop cylinder is fully armored against impact and abrasion by sandwich combination of steel sheathing and polyvinyl chloride filler; prop is extended and set by pumping; pump handle is engaged on inset square shank and until prop head meets resistance of half ton; each stroke extends prop 1 in.; at half ton loading low pressure piston disengages and high pressure operation takes over; this transition is absolutely positive and mechanically controlled.
"Atlas" hydraulic pit prop
Colliery Eng
Colliery Engineering ; 40
1963
2 pages
Aufsatz (Zeitschrift)
Englisch
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