Abstract: A boring head of a multiple-operation machine tool comprises a housing which is kinematically coupled to a spindle and adapted to accommodate a carriage spring-biased against the housing, carrying a mandrel for a cutting tool and having a slanted surface to interact with a slanted surface of a rod arranged in the housing coaxially with the latter and kinematically coupled to a drive which moves it in the axial direction. The boring head also incorporates a counterbalance comprising at least a pair of pins received in through holes provided in the carriage. The holes are symmetrical with respect to the axis of rotation of the boring head and extend at a perpendicular to said axis of rotation. The pins are kinematically coupled to the rod so that they can reciprocate in the through holes of the carriage.

Abstract: A boring head of a multiple-operation machine tool comprises a housing which accommodates a carriage carrying a mandrel for a cutting tool, and having a slanted surface to interact with a slanted surface of a rod arranged in the housing coaxially with the carriage and kinematically coupled to a drive which moves it in the axial direction. The housing also accommodates a fork arranged coaxially with the former and pressed against the carriage by a spring. At the ends of the fork are two slanted surfaces which are symmetrical with respect to the axis of rotation of the boring head. The fork interacts with the carriage on lines found in a plane extending through the axis of rotation of the boring head. The head further incorporates a rocker whose axle is installed in the housing on the side facing the two slanted surfaces of the carriage. The axle is parallel with the axis of rotation of the boring head.

Abstract: A spindle headstock of a multiple-operation machine tool, whose housing accommodates, in a coaxial and rotatable arrangement, a spindle kinematically coupled to a rotary drive, a tie rod carrying members intended for connection to the shank of a boring head having a swivel carriage, which tie rod is axially adjustable in relation to the spindle, and a bar carrying toothed members for meshing with toothed members mounted on an end of a slide bar whose opposite end serves for radial displacement of the carriage. The bar is kinematically coupled to a drive whereby it is displaced in the axial direction in relation to the spindle. The members of the tie rod, which serve for connection to the shank of the boring head, are mounted on the tie rod so that they can radially reciprocate during location of the tie rod. For radial adjustment of the bar, a bushing is provided on the tie rod, which is axially stationary in relation to the tie rod and kinematically coupled to the spindle and bar.