Rotary cam drive for impact tool
Rotary hammer driving mechanism Patent #: 4750567
ApplicationNo. 317180 filed on 02/28/1989
US Classes:173/48, Adjustable to impacting device173/109, Rotated by hammer head or drive for hammer head173/201, Pulsation caused by mechanical movement173/205, Rotary cam192/53.35Inward tooth or lug on friction member
ExaminersPrimary: Yost, Frank T.
Assistant: Rada, Rinaldi I.
Attorney, Agent or Firm
Foreign Patent References
International ClassB25D 011/10
Foreign Application Priority Data1988-03-04 DE
AbstractA rotary hammer has a pneumatic hammer mechanism which can be driven by means of a driver-part mounted rotatably on an intermediate shaft, with which driver-part a first coupling element of a coupling is non-rotatably connected, while the second coupling element of the coupling is non-rotatably mounted on the intermediate shaft and through axial displacement can be brought into positive coupling engagement with the first coupling element. A synchronizing arrangement is provided, which on approach of the coupling elements to one another, accelerates the first coupling element at least approximately to the rotational speed of the second coupling element and only then permits the positive engagement of the coupling elements.