发明名称 Kelly bar assembly
摘要 <p>The arrangement has a tubular inner rod (4) axially movably arranged against tubular outer rods (5', 5'', 5''') in a torque-proof manner. A spring unit (1) is arranged in a lower region of the inner rod for springing axial movement of the inner rod against the outer rods and is formed as an elastomer spring. Spacer rings (21', 21'') are formed from metal, and connection elements (22) are integrally formed on the spacer rings by metal forming. The spring unit includes elastomer spring elements (10', 10'', 10''') connected with each other by the spacer rings.</p>
申请公布号 EP2246520(A1) 申请公布日期 2010.11.03
申请号 EP20090005752 申请日期 2009.04.24
申请人 BAUER MASCHINEN GMBH 发明人 KROLLMANN, KARL JOHANNES, DIPL.-ING.;JAIS, MELCHIOR
分类号 E21B17/07 主分类号 E21B17/07
代理机构 代理人
主权项
地址