Patent ID: 6997087
Filing Date: 2006-02-14
Classification: B23D,B25B,B26D

Abstract:
1. A manually operated rotatable impact tool comprising: a driven member having means for retaining and driving a fastener about an axis, the driven member further having at least one anvil surface offset from the axis; a driving member rotatably connected to the driven member for driving the driven member about the axis to loosen or tighten the fastener, the driving member having at least one impact mass in cooperation with the at least one anvil surface; biasing means for biasing the at least one anvil surface and at least one impact mass together; at least one cam for engaging a surface of the driving member and for moving the at least one impact mass apart from the corresponding at least one anvil surface upon rotation of the cam and for releasing the driving member such that the biasing means pulls the at least one impact mass to impact the corresponding at least one anvil surface to create a torque around the axis; wherein the at least one cam comprises two cams, each rotatably disposed in the driven member and equally distanced from the axis, the at least one impact mass comprising two impact masses and the at least one anvil surface comprising two anvil surfaces, wherein each of the two cams corresponding with one of the two anvil surfaces and impact masses.