发明名称 |
Improvements in and relating to roller doors |
摘要 |
A roller door assembly has means for tensioning same wherein a load is applied to a bottom edge of the roller and means for counterbalancing the weight of the door wherein a load is applied to the roller, the loads exerted by both said means being dependent on the amount of door off the roller. |
申请公布号 |
US5159967(A) |
申请公布日期 |
1992.11.03 |
申请号 |
US19910700048 |
申请日期 |
1991.05.08 |
申请人 |
CLARK DOOR LIMITED |
发明人 |
ASHLEY, PAUL;CHAPMAN, JOHN U. |
分类号 |
E06B9/62 |
主分类号 |
E06B9/62 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|