发明名称 Nail driving impact hammer
摘要 A reciprocating ram or hammer is disclosed for driving flat nails in mines without danger of creating sparks that might ignite inflammable gases that would cause an explosion. The hammer comprises a cylindrical tube in which a ram is reciprocated to strike an anvil or drive pin which pushes against a flat nail by overcoming the resistance of a helical spring in the tube. As the nail is being driven, it is held at the end of the hammer by a permanent magnet. Such flat nails are commonly driven overhead for suspending lines.
申请公布号 US4316513(A) 申请公布日期 1982.02.23
申请号 US19800118573 申请日期 1980.02.04
申请人 HARRIS, DWIGHT 发明人 HARRIS, DWIGHT
分类号 B25C1/02;E21F9/00;(IPC1-7):B25C5/06 主分类号 B25C1/02
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