公开(公告)号：US4766787A

公开(公告)日：1988-08-30

申请号：US937108

申请日：1986-12-02

申请人： Tadakatsu Sugimoto ,  Yoshiaki Igarashi ,  Shiro Saito ,  Eiichi Wada ,  Keiji Murai

发明人： Tadakatsu Sugimoto ,  Yoshiaki Igarashi ,  Shiro Saito ,  Eiichi Wada ,  Keiji Murai

IPC分类号： B25B21/02 ,  B25B19/00

CPC分类号： B25B21/02

摘要： This invention relates to an impulse wrench which has two blades but generates only one impact pulse on the main shaft per one rotation of a liner. In this invention, a liner has at least four seals and a main shaft has at least two seals. And the shape of both or one of the two seals out of at least two seals of main shaft is other than a linear shape parallel to the axial center.If both of said two seals of main shaft are in said shape, two of at least four seals of liner are in the same shape. The other seals of liner are in a linear shape parallel to the axial center.If one of said two seals of main shaft is in said shape, one of at least four seals of liner is in the same shape as this. All of the other seals of liner are in a linear shape parallel to the axial center.In this way, said two seals of liner and said two seals of main shaft coincide with each other only once per one rotation of the liner.