首页>
外国专利>
MOUNTAIN DRILLING GUIDE ON SLIDING GUIDES FOR DRILLING AND MOUNTAIN BANKING
MOUNTAIN DRILLING GUIDE ON SLIDING GUIDES FOR DRILLING AND MOUNTAIN BANKING
展开▼
机译:钻孔和山银行滑动指南上的山钻指南
展开▼
页面导航
摘要
著录项
相似文献
摘要
The body of a bit guide assembly is mounted on a base which pivots on a frame about a first pivot point and may thus be retracted in order to allow the passage of the anchoring bolt screwed after drilling a hole. A double-acting jack has its rod pivoted on the base, whereas its body is pivoted on a dog, in turn mounted to pivot on the frame about a second pivot opposite the pivot point. The dog comprises a locking tooth which cooperates with the end of the base remote from the first pivot point. The free end of the dog cooperates with a retaining tooth formed on a connecting-rod, mounted to pivot about a fixed pin and biased by a spring against a stop. The same jack thus controls the retraction of the bit guide, for bolting and its locking in the lowered position, for drilling.
展开▼