| 发明名称 |
Adjustable counterbalance system for roller doors |
| 摘要 |
A counterbalance system for a rollup door system having a drum in which the counterbalance provides a counter force acting at a distance from the center of rotation of the drum. The counter force is variable in both direction and magnitude at various angular positions of the drum. |
| 申请公布号 |
US8267146(B2) |
申请公布日期 |
2012.09.18 |
| 申请号 |
US20090567410 |
申请日期 |
2009.09.25 |
| 申请人 |
FREDE FRIEDHELM;ASSA ABLOY ENTRANCE SYSTEMS AB |
发明人 |
FREDE FRIEDHELM |
| 分类号 |
E05F13/00;A47G5/02;A47H3/00;E05F15/00 |
主分类号 |
E05F13/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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