发明名称 |
Lift-assisted manhole cover |
摘要 |
A lift-assisted manhole cover assembly with a flush surface and external pivot shaft. The cover includes a mounting tab that extends beyond the general periphery of the cover. The mounting tab may be connected to a shaft that is threadedly engaged with the frame. A spring may be mounted between the frame and the mounting tab, for example, in a sleeve, to provide a mechanical assist in lifting the cover. The sleeve may be disposed outside the manhole opening where it does not block access to the manhole opening.
|
申请公布号 |
US7341398(B2) |
申请公布日期 |
2008.03.11 |
申请号 |
US20060420083 |
申请日期 |
2006.05.24 |
申请人 |
EAST JORDAN IRON WORKS, INC. |
发明人 |
JOHNSON JEREMY I.;VELDBOOM LEE M.;BEAL SCOTT B.;BARNUM HERBERT CARL;AUSTIN WILLIAM R.;MALPASS JAMES F.;LOVISKA TODD C.;RACHWITZ BRIAN J.;GARRINGER REX A.;SNYDER JOHN H. |
分类号 |
B65D43/18 |
主分类号 |
B65D43/18 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|