Dual drill bit apparatus |
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| 申请号 | US15399361 | 申请日 | 1961-11-21 | 公开(公告)号 | US3169591A | 公开(公告)日 | 1965-02-16 |
| 申请人 | WORTHINGTON JOHN D; OWEN JOHN L; | 发明人 | WORTHINGTON JOHN D; OWEN JOHN L; | ||||
| 摘要 | |||||||
| 权利要求 | 12. DRILLING APPARATUS COMPRISING A CASING MEMBER HAVING MEANS THEREIN FOR RECEIVING DOG MEANS, AN ATTACHMENT MEMBER IN SAID CASING MEMBER COMPRISING A BODY, OPENING DEFINING MEANS IN SAID BODY, DOG MEANS IN SAID BODY EXTENDING THROUGH SAID OPENING DEFINING MEANS AND INTO SAID RECEIVING MEANS, DOWNWARDLY DIRECTED TEETH MEANS ON SAID DOG MEANS, ACTUATOR MEANS IN SAID BODY HAVING UPWARDLY DIRECTED TEETH MEANS IN ENGAGEMENT WITH THE TEETH MEANS OF SAID DOG MEANS FOR MOVING SAID DOG MEANS INWARDLY UPON AXIAL MOVEMENT OF SAID TEETH ACTUATOR MEANS, AND A BIT SECURED TO THE SAID ATTACHMENT MEMBER, WHEREBY SAID ATTACHMENT MEMBER MAY BE DRIVEN FROM SAID CASING MEMBER AND REMOVED THEREFROM. |
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| 说明书全文 | |||||||
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