| 发明名称 |
Mechanically locked bell and spigot coupling for ducts and method of forming |
| 摘要 |
A bell and spigot coupling is provided with an abrasive-material insert to increase the disengagement force necessary to uncouple the ducting.
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| 申请公布号 |
US4110144(A) |
申请公布日期 |
1978.08.29 |
| 申请号 |
US19770781919 |
申请日期 |
1977.03.28 |
| 申请人 |
CANADIAN GENERAL ELECTRIC COMPANY LIMITED |
发明人 |
BUEHLER, AMSEY;BUTCHER, KIRK THOMAS |
| 分类号 |
F16L21/08;F16L37/02;(IPC1-7):B65H81/00;F16L37/08 |
主分类号 |
F16L21/08 |
| 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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