Patent ID: 7677326
Filing Date: 2010-03-16
Classification: B25D,Y10T

Abstract:
1. A driving mechanism for a powered hammer having a motor and a tool holder configured to hold a tool bit, the driving mechanism comprising: a ram mounted for reciprocation in a guide tube section, the ram having a radially outwardly projecting sealing portion and an outer circumferential surface that defines a helically shaped vent channel running from a front end portion of the circumferential surface to a rear end portion of the circumferential surface and being interrupted by the sealing portion; and a piston drivable in a reciprocating motion by the motor such that an air cushion is generated in a space between the ram and the piston to cause an impact on the tool bit by movement of the ram towards the tool bit, wherein the space between the ram and the piston is temporarily connected with ambient air through the vent channel and a recess in the wall of the guide tube section after causing the impact on the tool bit.