Национальный Университет Водного Хозяйства И Природопользования
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Национальный Университет Водного Хозяйства И ПриродопользованияfiledCriticalНациональный Университет Водного Хозяйства И Природопользования
Priority to UAU201300155UpriorityCriticalpatent/UA81289U/en
Publication of UA81289UpublicationCriticalpatent/UA81289U/en
A semi-flexible feather key with openings at the side of the ends along the axis of symmetry is made of two sections. The outer section is arranged as an flexible feather key with rounded ends, with inner cavity with outline like the outer one. The inner section – as a rigid insert with cuts at the ends, for instance, in triangular form, so, that the inner section is installed to the cavity of the outer section with light tension at straight sections.