发明名称 Step assembly
摘要 A manhole step assembly including a substantially U-shaped metal rod and a corrosion resistant covering molded about the rod is taught. The covering has a tapered portion formed at the free ends thereof, and the tapered portion has a roughed surface to increase the surface area of compression which is used to hold the step in place in the wall of a manhole shaft. A socket which may be cast in such a shaft is also disclosed.
申请公布号 US4655318(A) 申请公布日期 1987.04.07
申请号 US19850784808 申请日期 1985.10.04
申请人 H. BOWEN COMPANY, INC. 发明人 BOWEN, HARRY E.
分类号 E06C9/04;(IPC1-7):E06C9/04 主分类号 E06C9/04
代理机构 代理人
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