发明授权
- 专利标题： Mine prop construction
- 专利标题（中）： 矿山施工
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申请号： US946584申请日： 1978-09-28
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公开(公告)号： US4192479A公开(公告)日： 1980-03-11
- 发明人: Herbert Friebe, deceased , by Axel Rodert, administrator , Ulrich Reininghaus
- 申请人： Herbert Friebe, deceased , by Axel Rodert, administrator , Ulrich Reininghaus
- 专利权人： Friebe Herbert,Ulrich Reininghaus
- 当前专利权人： Friebe Herbert,Ulrich Reininghaus
- 优先权： DEX2640104 19760907
- 主分类号： E21D15/00
- IPC分类号： E21D15/00 ; E21D15/44 ; E04G25/04
摘要：
A hydraulically operated mine prop made of light metal, comprises an outer prop portion and at least one telescopic inner portion with at least one of these portions being provided with a non-sparking and impact-resistant metal covering. The covering may, for example, comprise steel, and an insulating layer is advantageously provided between the covering and the prop portion with which it is associated. The thickness of the covering is advantageously made from 0.2 mm to 0.6 mm.
公开/授权文献
- US5848829A Rear projection display device 公开/授权日：1998-12-15
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