公开(公告)号：US4336847A

公开(公告)日：1982-06-29

申请号：US163504

申请日：1980-06-27

申请人： Koshichi Ito ,  Yoshihiko Watanabe

发明人： Koshichi Ito ,  Yoshihiko Watanabe

IPC分类号： B25D16/00 ,  B25D17/06 ,  B23B45/04

CPC分类号： B25D16/00 ,  B25D17/06 ,  B25D2211/003 ,  B25D2211/068 ,  B25D2217/0015

摘要： A percussion drill comprises an open-ended, hollow cylinder having an air exhaust hole on the side wall thereof, a piston mounted in the rear end portion of the cylinder, and a slide shaft mounted in the front end portion of the cylinder. A drill bit is releasably attached to the forward end of the slide shaft for working with a material. Between the piston and the slide shaft is mounted a striker which forms a forward variable volume air chamber and a rearward variable volume air chamber. The piston is driven by a motor-crankshaft arrangement to reciprocate axially in the cylinder to cause a positive high pressure to develop in the rearward chamber, which pressure provides an impact on the striker whose mechanical energy is transferred to the slide shaft. A return movement of the piston develops a negative pressure in the rearward chamber to pull back the striker to the impact position. The striker is formed with an air passage which is open at one end to the forward chamber and at the other end to the side wall thereof for communicating the forward chamber to the atmosphere through the air exhaust hole of the cylinder. This communication is established when the workpiece is pierced to allow a negative pressure to develop in the forward chamber.

摘要翻译： 冲击钻包括开口的中空圆筒，其侧壁上具有排气孔，安装在气缸的后端部的活塞和安装在气缸的前端部的滑动轴。 钻头可释放地附接到滑动轴的前端，用于处理材料。 在活塞和滑动轴之间安装有撞击器，其形成前部可变容积空气室和向后可变容积的空气室。 活塞由电动机 - 曲轴装置驱动，以在气缸中轴向往复运动，从而在后室中形成正高压，该压力对其机械能传递到滑动轴的撞针提供冲击。 活塞的返回运动在后室中产生负压，以将撞针拉回冲击位置。 撞针形成有一个空气通道，该通道在一端向前室敞开，另一端形成在其侧壁上，用于通过气缸的排气孔将前室与大气连通。 当穿透工件以允许在正向室中产生负压时，建立该通信。