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Subject: solid-core piston Посоветуйте, пожалуйста, как здесь можно перевести solid-core? Сплошной поршень? твердотельный? Спасибо. ( Down the hole drilling machine and method for drilling rock) An idea of an embodiment is that the piston has a solid outer surface or shell. Thereby the piston is without any a transverse through openings. When the piston has no cross holes, the structure may be simple and robust. However, the piston may or may not comprise at least one axial opening extending longitudinally end to end of the piston. In a reverse circulation drilling the piston comprises a central opening through which a central collecting tube is arranged. In this solution the piston is a sleeve-like piece without transverse holes. An idea of an embodiment is that the piston has a solid-core configuration without any axial or transverse openings. When the piston has no axial or central openings and is without cross holes or any through holes, the structure of the piston is robust and durable. Further, the solid-core piston is easy to manufacture.
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