发明名称 |
TWIN SPROCKET GARAGE DOOR OPENER |
摘要 |
An adjustable speed garage door operator which has a longitudinal rail with a trolley mounted on the rail and connected to a door to open and close it. A chain is connected to the trolley and is mounted on a front idler sprocket and can be selectively mounted on different drive sprockets which have different numbers of teeth so as to vary the speed of the door. |
申请公布号 |
GB2205898(B) |
申请公布日期 |
1991.05.01 |
申请号 |
GB19880011260 |
申请日期 |
1988.05.12 |
申请人 |
THE * CHAMBERLAIN GROUP INC |
发明人 |
COLIN B * WILMOTT;JAMES S * CHANG |
分类号 |
E05F15/10;E05D15/38;E05F15/16 |
主分类号 |
E05F15/10 |
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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