Patent ID: 6079919
Filing Date: 2000-06-27
Classification: B23B,Y10T

Abstract:
A clamping device for tool spindles, comprisinga sleeve (1) having a distal end with an internal cone (2) for receiving a cone (7) of a tool (6);a draw rod (4) axially movable in said sleeve (1), said draw rod (4) having a distal end with a tool holder (5), movable by axial movement of said draw rod (4) in said sleeve 1 between clamped and unclamped positions;a first, pretensioned spring assembly (8) between said sleeve (1) and said draw rod (4) for producing a tensile force on said draw rod (4) and driving said draw rod towards a proximal end of said sleeve (4) and moving said tool holder (5) into its clamped position;actuating means (22, 23) at the proximal end of said clamping device for displacing said draw rod (4) toward said distal end of said sleeve (1) counter to spring force of said first spring assembly (8),a second spring assembly (15) for increasing tensile force on said draw rod (4), coupled in pretensioned manner between said proximal end of said sleeve (1) and said proximal end of said draw rod (4); andfirst actuating means (20, 21) for uncoupling said second spring assembly (15) from said draw rod (4).