Expansion chuck (1) with a base body (9) and an expansion sleeve (10) which is surrounded by a receptacle (6) for a tool, wherein the expansion sleeve (10) inside the base body (9) and at the front end (3) of the receptacle (6) is connected pressure-tight to the base body (9), thus forming a pressure chamber (11) between the base body (9) and the expansion sleeve (10), characterized in that the expansion sleeve (10) at the front end (3) of the base body (9) extends radially outward to an connecting section (34), where it is connected to the base body (9) in a pressure-tight manner.

A rotatable chuck for clamping a shank portion of a rotatably operating machining tool includes a rotatable chuck body provided with a cylindrical bore concentric with a rotation axis of the chuck body. The circumferential surfaces of a clamping portion of the bore are arranged to apply a clamping force around the circumference of the shank portion of the tool when it is mounted in the chuck to fixate the tool in the chuck. The chuck is provided with auxiliary pull out preventing means for preventing inadvertent pull out of the tool in the axial direction of the bore during machining operation, as well as auxiliary rotary preventing means for preventing inadvertent rotation in at least one direction in relation to the chuck during machining operation. The auxiliary pull out and rotary preventing means include an attachment member positionable in an inner portion of the bore and attachable to the shank portion to be clamped, such that the tool and the attachment member will be prevented from being pulled apart in the axial direction and from being rotated in at least one direction in relation to each other.

A tool holder comprising a base element, a deformable receiver for clamping a tool and at least one locking element configured for preventing an axial extraction of the tool from the tool holder through engaging a corresponding opposite element at the tool, wherein the at least one locking element is integrally configured in one piece with the receiver.

The invention relates to a hydraulic expanding chuck for gripping a tool, for example a drill or a milling tool, comprising: a clamping part having an expansion sleeve having a central receiving opening for receiving and clamping the tool; and a connection part, in particular having a HSK connection. According to the invention, the expansion sleeve has at least two pressure chambers, which are designed to run around the central receiving opening, which are arranged at an axial distance relative to one another, and which can bulge when the tool received in the central receiving opening is subjected to fluid pressure. The at least two pressure chambers are connected to one another by a fluid channel.

A tool holder has a base element, a deformable receiver for clamping a tool and at least one locking element configured for preventing an axial extraction of the tool from the tool holder through engaging a corresponding opposite element at the tool. The at least one locking element is integrally configured in one piece with the receiver.

A tool holder with a main part, a deformable receiving portion for clamping a tool, and at least one blocking element which is designed to engage into a corresponding counter element on the tool in order to prevent the tool from moving axially out of the tool holder. The at least one blocking element is integrally formed with the receiving portion. A clamping system having such a tool holder and a method for producing a receiving portion for such a tool holder are also described.

In one aspect, expansion sleeves for pressure-activated tool holder apparatus are described herein. An expansion sleeve, for example, comprises a first end, a second end and a longitudinal axis extending between the first end and the second end. A first set of fluid chambers are proximate the first end of the sleeve and a second set of fluid chambers are proximate the second end, wherein fluid channels extend along the longitudinal axis to connect radially offset fluid chambers of the first and second sets.

In one aspect, expansion sleeves for pressure-activated tool holder apparatus are described herein. An expansion sleeve, for example, comprises a first end, a second end and a longitudinal axis extending between the first end and the second end. A first set of fluid chambers are proximate the first end of the sleeve and a second set of fluid chambers are proximate the second end, wherein fluid channels extend along the longitudinal axis to connect radially offset fluid chambers of the first and second sets.

The invention relates to a hydraulic expansion chuck having an end on the tool side; and an end on the machine side. A shaft is disposed on the end on the machine side for clamping the expansion chuck in a machine tool. An expanding bushing is disposed on the end on the tool side and surrounded by a pressure chamber and can be radially deformed for clamping a tool under the action of a pressure medium received in the pressure chamber.

The invention relates to a hydraulic expanding chuck for gripping a tool, for example a drill or a milling tool, comprising: a clamping part having an expansion sleeve having a central receiving opening for receiving and clamping the tool; and a connection part, in particular having a HSK connection. According to the invention, the expansion sleeve has at least two pressure chambers, which are designed to run around the central receiving opening, which are arranged at an axial distance relative to one another, and which can bulge when the tool received in the central receiving opening is subjected to fluid pressure. The at least two pressure chambers are connected to one another by a fluid channel.