A bearing adapter for a disk-shaped accessory tool which has two sides. The bearing adapter includes a bearing unit configured to reduce a bearing recess of the accessory tool. The bearing unit is configured to adjoin the accessory tool and to enclose a portion of the accessory tool on the two sides when the bearing unit is mounted on the accessory tool.

A quick-change device for a rotary power tool, such as a circular saw, comprising: a grip hub; a threaded bolt; a bolt key; wherein the bolt key is connected to the threaded bolt, such that the bolt key has at least an extended position and a collapsed position; wherein the threaded bolt is configured to pass through a bolt hole of the grip hub and threadably connect to a spindle of a circular saw; wherein the bolt key is configured to be able to be unscrewed from the spindle when in the extended position, such that an external tool is not needed to remove the threaded bolt from the spindle; wherein the bolt key is configured to matingly stow next to the grip hub when the bolt key is flipped down into the collapsed position; and wherein the threaded bolt may be quickly and safely removed and reengaged for the purpose of switching one or more saw blades.

A quick-change device for a rotary power tool, such as a circular saw, comprising: a grip hub; a threaded bolt; a bolt key; wherein the bolt key is connected to the threaded bolt, such that the bolt key has at least an extended position and a collapsed position; wherein the threaded bolt is configured to pass through a bolt hole of the grip hub and threadably connect to a spindle of a circular saw; wherein the bolt key is configured to be able to be unscrewed from the spindle when in the extended position, such that an external tool is not needed to remove the threaded bolt from the spindle; wherein the bolt key is configured to matingly stow next to the grip hub when the bolt key is flipped down into the collapsed position; and wherein the threaded bolt may be quickly and safely removed and reengaged for the purpose of switching one or more saw blades.

A blade changer unit includes a blade chuck for holding a cutting blade, a moving unit for moving the blade chuck, and a control unit for controlling moving unit. The blade chuck has a plurality of electrically conductive grippers for holding the cutting blade. The controller detects conduction between the grippers and a boss. The control unit includes a calculator for calculating the position of a central axis of the mount from coordinates where the conduction between the holder and the boss is detected when the moving unit is controlled to bring the grippers into contact with the mount at at least three points, and a mounting/dismounting controller for mounting and dismounting the cutting blade while the central axis of the blade chuck is aligned with the central axis of the mount calculated by the calculator.

A blade changer unit includes a blade chuck for holding a cutting blade, a moving unit for moving the blade chuck, and a control unit for controlling moving unit. The blade chuck has a plurality of electrically conductive grippers for holding the cutting blade. The controller detects conduction between the grippers and a boss. The control unit includes a calculator for calculating the position of a central axis of the mount from coordinates where the conduction between the holder and the boss is detected when the moving unit is controlled to bring the grippers into contact with the mount at at least three points, and a mounting/dismounting controller for mounting and dismounting the cutting blade while the central axis of the blade chuck is aligned with the central axis of the mount calculated by the calculator.

A grinding-means device, in particular a grinding-disc device or backup-pad device, for arranging at least one grinding means, in particular at least one grinding wheel, on a portable power tool, in particular a grinding machine, includes at least one receiving unit, in particular a grinding disc or backup pad, which is fixable in a thread-free manner on an output unit of the tool and on which at least one grinding means is arranged. The grinding-means device includes at least one securing unit formed separately from the receiving unit and configured to axially fix the receiving unit and/or the grinding means to the output unit of the tool in a tool-free manner, and/or at least to axially fix the grinding means to the receiving unit in a tool-free manner.

An oscillating interface for an oscillating too includes a post, a pin which extends through the post, a flange slidably positioned on the post between the pin and a distal end of the post. The flange includes a drive side and a mounting side. The drive side includes a drive structure configured to interlock with a drive structure of an accessory tool. The mounting side is arranged facing the pin and defines at least one notch configured to receive the pin. A clamping member is configured to be threaded onto the post and to clamp the flange against the pin with the pin received in the notch.

An oscillating interface for an oscillating too includes a post, a pin which extends through the post, a flange slidably positioned on the post between the pin and a distal end of the post. The flange includes a drive side and a mounting side. The drive side includes a drive structure configured to interlock with a drive structure of an accessory tool. The mounting side is arranged facing the pin and defines at least one notch configured to receive the pin. A clamping member is configured to be threaded onto the post and to clamp the flange against the pin with the pin received in the notch.

The present invention proposes a rapid replacing structure for multi-purpose saw, including the operating mechanism, clamping mechanism and collet; the collet is released or clamped by driving the clamping mechanism through the operating mechanism; in addition, the structure also comprises an output shalt whose top and bottom openings form a chamber; the collet is placed in the output shaft; the clamping mechanism comprises a spring element that clings to the outer side of collet, a collet sleeve and a compressor arm; one end of the spring element is connected to the bottom wall of chamber, while the other is connected with the collet sleeve; there is also an output cover designed to limit the compressor arm; the top of compressor arm is connected in a contacted manner to the operating mechanism by passing through the output cover; the operating mechanism pushes the compressor arm down to drive the collet sleeve to move downward, thereby releasing the collet; in addition, a tension board is arranged in the collet to fix the top-end tool. The present application is easy to operate and designed for rapid replacement of operating tools.

A quick clamping device for arranging at least one application tool on a power tool, in particular on an angle grinder, includes at least one output unit for moving the application tool about an output axis of the output unit, and at least one fixing unit having at least one movably mounted fixing element that is mounted, in particular in a non-removable manner, on the output unit, at least for axially fixing the application tool to the output unit. The quick clamping device has at least one securing unit, which has at least one, in particular movably mounted, securing element that is intended to secure the fixing element, which is mounted so as to be movable relative to the output unit at least about the output axis, so as to prevent the fixing element from moving about the output axis.