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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0856059 (1977-11-30) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 13 인용 특허 : 1 |
The driving power and driving rate of a pile driver hammer is increased without increasing the overall weight of the hammer through the use of a hydraulic spring transformer which is disposed between the ram and the pile in the housing of the hammer and presents a Q at the frequency where the mass o
In a pile driver having a housing adapted to be placed upon the pile to be driven, a ram mounted for reciprocating movement in said housing with means for repetitively driving said ram in forward and return strokes toward and away from said pile, apparatus which permits the ram weight to be reduced,
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