发明名称 |
Heavy duty adjustable prop with a ball-and-socket joint |
摘要 |
A ball joint for transmitting forces between the prop and the head-piece of a support unit has a spherical head received in the spherical internal surface of a dome. The dome is enclosed by a spherical ring which is fastened to the head. The rod of a prop carries a pivot which is mounted with radial clearance in a cylindrical cavity located within the sphericl head.
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申请公布号 |
US4231672(A) |
申请公布日期 |
1980.11.04 |
申请号 |
US19790052013 |
申请日期 |
1979.06.25 |
申请人 |
CHARBONNAGES DE FRANCE |
发明人 |
BLANPAIN, GUY;GRANDFILS, PIERRE |
分类号 |
E21D17/10;F16C11/06;(IPC1-7):F16C11/00 |
主分类号 |
E21D17/10 |
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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