A coupling arrangement for a tool, the coupling arrangement comprising a drive part rotatable about a rotation axis, the drive part comprising a drive profile; a driven part rotatable about the rotation axis, the driven part comprising a driven profile complementary to the drive profile, the driven profile being arranged to mate with the drive profile in a coupled position for torque transfer between the drive part and the driven part; and an aligning arrangement arranged to force a relative rotation between the drive part and the driven part about the rotation axis from a nonaligned state of the coupling arrangement, where the drive profile is not rotationally aligned with the driven profile, towards an aligned state of the coupling arrangement, where the drive profile is rotationally aligned with the driven profile.

A clamping device for clamping a workpiece or a tool or, more specifically, a tool holding fixture in a machine part of a machine tool includes a tension rod slidably mounted within the machine part; a clamping set movable by the tension rod between clamped and released positions; a tension spring dedicated to the tension rod so as to generate the pull-in force of the clamping set; and a release mechanism, by which the clamping set can be moved against the force of the tension spring into the released position by the tension rod. To make possible effective clamping at optimum force, the tension spring is clamped between first and second rod parts of the tension rod. The second rod part can move relative to the first rod part, and, as the clamping set moves into the released position, is compressed on both ends by the release mechanism by moving the two rod parts in opposite directions.

An adapter tool with a drill bit is provided that selectively connects to a driver to provide added versatility to the driver. The adapter tool includes a spring with an engagement end that extends through a body to selectively engage a recess in the driver. A user can actuate the spring to quickly engage and disengage the adapter from the driver. In practice, a user can use the adapter-driver combination to drill a pilot hole using the drill bit on the adapter, selectively remove the adapter from the driver, and then put a screw into the pilot hole using the driver.

A balancing or measuring device includes a main body which is rotatable about an axis and includes an opening for accommodating a coupling shaft of a component to be balanced or measured, and having a centering element which can be axially displaced within the main body against a spring arrangement to center the component in the main body. In order to ensure maximum concentricity also in a balancing or measuring device having a small number of parts, the spring arrangement is designed to be integral with the centering element.

A tool bit including a tip configured to engage a work surface, a shank extending from the tip and defining a longitudinal axis, and a drive portion coupled to an end of the shank opposite from the tip and configured to be engaged by a tool, wherein the drive portion includes a plurality of splines circumferentially spaced around the longitudinal axis, each spline having opposing sidewalls which extend through the drive portion

A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

A milling apparatus has a housing, a drive shaft extending along and rotatable about an axis in the housing and an axially compressible and radially expansible washer stack on the front end of the drive shaft. A tool is held by the on the shaft. A bolt projects radially in a slot through the shaft and is limitedly axially displaceable in the shaft. An actuator element shiftable axially in the passage projects axially forward out of the drive shaft and is fixed in the bolt. A clamping assembly axially compresses and radially expands the stack so as to lock the tool to the drive shaft. A spring assembly is braced axially forward against the housing and axially rearward against the bolt. A piston axially displaceable on the drive shaft in the housing bears axially forward on the bolt.

An adapter tool with a drill bit is provided that selectively connects to a driver to provide added versatility to the driver. The adapter tool includes a spring with an engagement end that extends through a body to selectively engage a recess in the driver. A user can actuate the spring to quickly engage and disengage the adapter from the driver. In practice, a user can use the adapter-driver combination to drill a pilot hole using the drill bit on the adapter, selectively remove the adapter from the driver, and then put a screw into the pilot hole using the driver.

A cutter holder assembly has a cutter holder, a collet disposed in the cutter holder and having a positioning groove and a mounting cavity, a cutter set mounted in the collet, and a resilience tightening set mounted in the mounting cavity of the collet. The cutter set includes a cutter body and a positioning protrusion engaged with a limiting groove of the positioning groove. The resilience tightening set includes a spring room, a spring disposed in the spring room, and a position ball movably disposed in and partially extending out of the spring room. The position ball is pushed by the spring to push the cutter set to keep the positioning protrusion tightly abutting against a surface of the limiting groove, thereby reducing a longitudinal assembling gap between the cutter set and collet.

[Object] To provide a spindle device capable of clamping two positions at the inside and the outside of a multifunctional holder with one driving means, a machine tool having the spindle device mounted thereon, and the like.

[Solution Means] In a spindle device to be used by mounting a holder having a first clamped part and a second clamped part arranged doubly on a spindle leading end, a first draw bar 8 and a second draw bar 9 overlap each other and are arranged in series in a spindle cylinder. As the first draw bar 8 is pushed and advanced by a striking metal 17, the first draw bar 8 is advanced against a biasing force of a first disc spring assembly 10 and a first clamping mechanism is released, and along with this, the second draw bar 7 is also advanced against a biasing force of a second disc spring assembly 11, and a second clamping mechanism is also released. As the striking metal 17 is retreated, the first and second clamping mechanisms of the first and second draw bars 8 and 9 are activated by the biasing forces of the first and second disc spring assemblies 10 and 11.