Patent ID: 6138772
Filing Date: 2000-10-31
Classification: B25D

Abstract:
A drill, comprising a housing (1); a working spindle (5) for receiving a tool (6) and rotatably supported in the housing (1); and a hammer mechanism (7) for generating axial blows to be imparted to the tool (6), the hammer mechanism (7) including:first cam disc (11) connected with the working spindle (5) for joint rotation therewith,a second cam disc (12) supported in the housing (1) without a possibility of rotation relative thereto but with a possibility of axial displacement therein and having a projection (22) extending through the first cam disc (11) and into the working spindle (5) for imparting the axial blows to the tool (6) which is received in the working spindle (5) with a possibility of a limited axial displacement relative thereto, the first cam disc (11) sliding over the second cam disc (12) upon rotation of the working spindle (5) for displacing the second cam disc (12) in a direction opposite to drilling direction,a first spring (14) located between a surface (13) of the second cam disc (12) facing in the direction opposite to the drilling direction and a surface in the housing (1) facing in the drilling direction for biasing the second cam disc (12) into the drilling direction,an adjusting element (19) for adjusting blow power of the axial blows imparted to the tool (6), displaceable parallel to the drilling direction and having at least one working surface (18), anda second spring (23) located between the surface (13) of the second cam disc (12) and the working surface (18) of the adjusting element (19) for further biasing the second cam disc (12) into the drilling direction, the adjusting element (19) displacing an operational point of the second spring (23) into an operating region of the first spring (14).