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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0086370 (1998-05-28) |
발명자 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 3 |
A driver hammer for driving an elongated member into the earth and for extracting the member from the earth includes a hammer body and a forward driving anvil slidably mounted in the body that is engaged directly with the elongated member when the latter is driven into the earth. A conventional hamm
[ What is claimed is:] [1.] Mechanism for driving an elongated member into the earth and for extracting said elongated member from the earth, comprising a hammer body, a forward driving anvil slidably mounted in said body engaging the elongated member when the latter is driven into the earth, a back
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