Abstract: A tool holder comprises a receptacle having one end connectable with a machine spindle, to a receptacle and the like and an opposite end, a head provided on the opposite end and having a coaxial cylindrical head opening, a housing received non-rotatably and axially longitudinally displaceable in the head opening and having a coaxial cylindrical housing opening, a quick exchange insert for a tool insertable in the housing opening and coupleable with the housing, and an inner signal device reacting to a relative movement between the head and the inserted quick exchange insert to produce a disturbance signal which identifies a damaged or a destroyed tool.

Abstract: A chuck for a tool, particularly a drilling tool has a shaft receivable in a machine spindle, a sleeve arranged for receiving a fast exchange insert with a tool or directly a tool, a longitudinal compensation device connecting the sleeve with the shaft and reacting to a relative axial displacement of the shaft and the sleeve, a signal device provided with a current source, a signal transmitter and a switch which is axially displaceable between the shaft and the sleeve and arranged in a current supply circuit of the signal transmitter, at least a part of which transmitter is arranged outside and peripherally of the shaft, and an outer ring holder which surrounds the shaft and carries the signal device together with the current source, the signal transmitter and the switch.

Abstract: A tool of a metal-cutting machine provided with numerical control has an information data carrier for storing various data of tool characteristics such as the length, diameter, service life and other parameters of the tool. The data carrier is formed by an electrically erasable programmable read-only memory which has a large storage capacity. The memory is rigidly inserted in the tool or tool holder and is protected against damage and contamination. Inadvertent release and loss of the data carrier are avoided.

Abstract: A chuck for drilling tools is formed with a hollow shank which can be accommodated in a machine spindle, and is provided with a sleeve, which is adapted for accommodating a quick-change insert in the form of a tool or serves to accommodate a tool and which is coupled with the shank through an adjustable torque clutch device which, in the event of an overload, automatically disengages along with an axial relative displacement between the shank and the sleeve. The chuck has a high-frequency transmission device which is provided with a current source of its own, a high-frequency transmitter, a switch, which is closable during the axial relative movements between the shank and the sleeve, in the current supply circuit of the high-frequency transmitter and an external aerial ring.

Abstract: A chuck unit for boring, drilling or cutting tools having a safety clutch so as to prevent overload resulting from broken or dull tools and wherein when the clutch is actuated by an overload a transmitter in the tool support is actuated to radiate a signal which is detected by a receiver so as to indicate the malfunction and/or stop the tool so as to prevent damage to the tool or workpiece.

Abstract: An overload coupling device has a drive shank, a drive sleeve for driving the drive shank, a closure sleeve surrounding the drive sleeve and a thrust ring. The shank and sleeves is provided with apertures containing balls and the thrust ring is urged by a spring to normally hold the balls in the apertures of the drive shank and drive sleeve to provide a driving connection therebetween but allows the balls to slide in the apertures of the drive sleeve and into the apertures of the closure sleeve to release the driving connection in the event of torque overload.