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专利名称：Pneumatic screw driver and stop control
method for air motor in pneumatic screwdriver
发明人：Makoto Kosuge,Masaki Haruta申请号：US12498584申请日：20090707公开号：US080919B2公开日：20120110
专利附图：
摘要：A pneumatic screw driver includes: a tool body; a nose portion; a main airchamber; a hammering cylinder; a driver bit integrally combined with a hammering piston
in the hammering cylinder; an air motor; a valve housing provided in an air passagebetween the main air chamber and the air motor; a stop valve piston provided in the valvehousing; a stop valve stem coaxially provided with the stop valve piston; a timer chamberconnected to the hammering cylinder; a first pipeline and a second pipeline respectivelyformed at upper and lower positions in a lower portion of the stop valve stem; and aupper end proximal portion of a contact member provided slidably in a driving direction.The upper end proximal portion of the contact member is provided engageably with thestop valve stem. The first pipeline and the second pipeline are arranged so as to closethe first pipeline after closing the second pipeline by moving the stop valve stem upwardfrom a bottom dead center.
申请人：Makoto Kosuge,Masaki Haruta
地址：Tokyo JP,Tokyo JP
国籍：JP,JP
代理机构：Drinker Biddle & Reath LLP
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