公开(公告)号：US3976149A

公开(公告)日：1976-08-24

申请号：US545450

申请日：1975-01-30

申请人： Sven Granholm ,  Borje Meijer

发明人： Sven Granholm ,  Borje Meijer

IPC分类号： E21B19/18 ,  E21C19/04

CPC分类号： E21B19/18 ,  Y10T483/1736 ,  Y10T483/1752

摘要： At a rock drill, preferably most forwardly on its frame, a magazine with drill bits is arranged. When a drill bit has been worn such that it must be exchanged, the drill rod is retracted so much that the worn drill bit arrives at the magazine. By special means at the magazine the worn bit is unscrewed from the rod and replaced by a new bit from the magazine.

摘要翻译： 在凿岩机上，优选地在其框架上最前端布置有具有钻头的料仓。 当钻头被磨损使得必须更换钻头时，钻杆被缩回，使得磨损的钻头到达刀库。 通过杂志的特殊手段，磨损的钻头从杆上拧下并被杂志的新的一点取而代之。