公开(公告)号：US4023627A

公开(公告)日：1977-05-17

申请号：US617320

申请日：1975-09-29

Applicant: John Madison Clapp ,  Reginald William Pauley

Inventor： John Madison Clapp ,  Reginald William Pauley

IPC: B23P19/06 ,  B25B21/00 ,  B25B23/145 ,  F01B17/02 ,  F01B25/02 ,  F01C20/08 ,  F01C21/18 ,  F01D15/06 ,  B23Q5/06 ,  F01C21/12

CPC classification number: F01C21/186 ,  B25B23/145 ,  F01B17/02 ,  F01B25/02 ,  F01C20/08

Abstract: This invention relates to power tools and more particularly to an air-operated power tool commonly used for automotive or other assembly operations for installing threaded fasteners. The device of this invention shuts off the power tool as it approaches the stall condition. Motor rotation is sensed by transferring a small mass of air in proportion to the speed of the motor but independent of the air expanded to operate the motor. The air transferred is utilized to create a signal which through an air-operated valve shuts the power tool off when the speed is reduced below a predetermined amount as when the torquing cycle is nearing completion.

Abstract translation: 本发明涉及电动工具，更具体地说，涉及一种通常用于汽车或其它组装操作的气动动力工具，用于安装螺纹紧固件。 本发明的装置在接近失速状态时切断电动工具。 通过与电动机的速度成比例地传递小量的空气来检测电动机旋转，而与膨胀的空气无关以操作电动机。 传送的空气用于产生一个信号，当扭矩循环接近完成时，当速度降低到预定量以下时，通过气动阀关闭电动工具。