Traffic signalling post

作者： Denis P. Hugron

DOI:

关键词: Diaphragm (mechanical device) 、 Engineering 、 Structural engineering

摘要: The invention is a traffic signalling post which comprises flexible rod member, rigid shaft coaxially secured at one end to the an anchor bore member adapted house for maintaining latter in vertical position. has perforated elastic diaphragm peripherally sealing location adjacent when sits member. particularly characterized by pair of rectilinear lips extending upwardly and be depressed downwardly with introduction raised retraction from