发明名称 |
POWER TONG HEAD AND ASSEMBLY |
摘要 |
A power tong in which the rotary head has opposed jaws slidably mounted in jaw guides and shiftable radially outwardly by springs and radially inwardly by cam surfaces and cam followers, the cam surfaces being compound so as to move the jaws inwardly upon rotation of an outer drive ring in either direction relative to an inner jaw supporting ring.
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申请公布号 |
US3635105(A) |
申请公布日期 |
1972.01.18 |
申请号 |
USD3635105 |
申请日期 |
1969.07.22 |
申请人 |
BYRON JACKSON INC. |
发明人 |
JOHN L. DICKMANN;HOWARD S. FLICK |
分类号 |
E21B19/16;(IPC1-7):B25B17/00 |
主分类号 |
E21B19/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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