Impact absorbing, overload protection apparatus for machine tool

摘要

An impact absorbing device for protecting a rotatable member of a motor powered machine tool feed mechanism from excessive impact and overload is disclosed. The device includes structure forming a flanged piston concentrically mounted with respect to the rotatable member and axially slidable within a housing in response to axial displacement of the rotatable member, (which is undesirable and thrust and radial bearing structure in which the rotatable member is journaled for rotative displacement. The housing and the flanged piston combine to define a pressure chamber whose volume varies as a function of the axial position of the piston. The pressure chamber is connected to a source of fluid under pressure, to cause the piston to yieldingly resist axial displacement of the rotatable member with respect to the housing. Also disclosed is apparatus connected to the rotatable member for interrupting the application of power to the rotatable member in response to a predetermined degree of axial displacement of the rotatable member.