Patent ID: 6634651
Filing Date: 2003-10-21
Classification: B23B,Y10T

Abstract:
A compensated tool holder for tapping spindles, comprising a spindle (1) and a coaxial hollow body (5) inserted in said spindle (1) and axially sliding therein, said coaxial hollow body (5) comprising an upper hollow half-pin (6) and a lower hollow half-pin (9) that engage mutually and coaxially through a semielastic conic coupling (10), associated with a sequential threaded coupling (11), wherein:(a) the spindle (1) has an external conic structure (2) configured as a tool holder and an internal coaxial structure provided with a coaxial central chamber (3), having a lower abutment (4), and with radial sliding half-grooves (25); (b) the upper hollow half-pin (6) of the coaxial body (5) comprises an abutment (7); a lower end (17), below the abutment (7), comprising an intermediate threaded portion (18) followed by an end portion having a conic profile (19), the complete extension of the sequential portions (18, 19) being provided with longitudinal notches (20) of elastic deformations; and an upper end, above the abutment (7), provided, on the external circumference, with radial half-grooves (25â€²), and having a quadrangular hole (14) for the coupling and rotational pulling of the tool, through the corresponding tang (15); (c) elastic pressure means (8), with a pressure compensating calibration during operating phases, is engaged between the abutment (4) of the spindle (1) and the abutment (7) of the upper hollow half-pin (6); (d) guiding and rotational drawing means (26) are arranged between the aligned radial half-grooves (25, 25â€²) of the spindle (1) and of the upper end of the upper hollow half-pin (6); and (e) the lower hollow half-pin (9) comprises an upper end with a threaded portion (21) followed by a conic portion 22, said portions (21, 22) being complementary to the corresponding portions (18, 9) of the lower end (17) of the upper hollow half-pin (6).