A machine tool (1) is provided, in particular an angle grinder, including a spindle (8) that can be driven about a rotational axis (L), a device (9) being provided which can be fixed to the spindle (8) by a rotary connection. A separate securing device (26) is provided which is operatively connected to the spindle (8), which is arranged on the output side of the device (9), at least in some regions, and which, at least during operation of the machine tool (1), has a smaller outer diameter (28), at least in some regions, with respect to the rotational axis (L) than an outer diameter (14) of the spindle (8).

A clamping device for clamping grinding wheels on a driving spindle of a working tool, which includes a rear flange intended to be fitted on the driving spindle in a position proximal to the working tool, wherein the rear flange is provided with a front face with which a first damping element is associated; a front flange intended to be fitted on the driving spindle and provided with a rear face, facing the front face of the rear flange, with which a second damping element is associated; and wherein the front face of the rear flange has a width larger than the rear face of the front flange and the first damping element has a hardness lower than the second damping element.

An electrospindle includes a motor for moving a tool and a motor shaft for transmitting motion from the motor to the tool. The electrospindle has a gripping head of the tool and a coupling of the tool to the motor shaft, and the gripping head includes two flanges, between which a portion of the tool and at least one thrust nut of a first flange can be interposed toward a counterflange, so as to hold the tool in position. The transmission has a free end threaded so as to receive the at least one thrust nut by screwing, the thread of the free end being double with a first right-handed thread and a second left-handed thread.

A power tool includes an output shaft, an installation apparatus and a retention mechanism. The installation apparatus has an operation state and an installation state. The retention mechanism is capable of providing a retaining force that keeps the installation apparatus in the installation state. The retention mechanism includes a movable piece. The output shaft is formed with a guide rail that guides the movable piece to move. The movable piece is capable of moving along the guide rail to a first retention position and a second retention position. When the installation apparatus is in the installation state and receives a rotation force applied by the operation accessory, the rotation force causes the movable piece to move from the second retention position to the first retention position so that the installation apparatus is switched from the installation state to the operation state.

A power tool is provided including an output spindle rotatably driven by an electric motor. The output spindle defines a longitudinal axis and includes a threaded portion near a distal end and an annular rim. A retention flange is provided including a radially-oriented disc-shaped portion having a center through-hole through which the output spindle extends and a cylindrical wall peripherally extending from the disc-shaped portion around the output spindle. The disc-shaped portion is located between the distal end and the annular rim, and the cylindrical wall extends around the annular rim. At least one spring member is disposed between the annular rim and the retention flange. A retention member is provided to restrain an axial displacement of the retention flange away from the annular rim due to the biasing force of the spring member.

A power tool is provided including a housing including a motor case and a handle; an electric motor housed within the motor case and rotatably driving a motor spindle; a gear case mounted on the housing; and an output spindle rotatably coupled to the motor spindle. The output spindle, motor spindle, and the handle form the plane through the housing. A fan is coupled to the motor to generate an airflow through the housing. The housing includes a first air inlet on a first side of the plane and a second air inlet a second side of the plane opposite the first air inlet, both adjacent the motor. The first air inlet is larger than the second air inlet to allow a larger volume of air to enter the housing from the first side of the plane than from the second side of the plane.

The present embodiment discloses a hand-held tool and a clamping device thereof. The clamping device of a hand-held tool includes: a mounting base; a clamping unit configured to fasten a working tool in an axial direction; and an operation assembly, including an operating member and a driving member, where the operating member is capable of performing compound motion relative to the mounting base, and the operating member is operable to drive the driving member to selectively mate with and disengage from the clamping unit. In this way, the hand-held tool of the present embodiment has the clamping device. By way of compound motion, not only comfort of operation can be achieved, but also parts can be saved, thereby making the structure simpler and more reliable.

The invention refers to a double-sided polishing or sanding member (24) for releasable attachment to a hand-guided power tool (2). The polishing or sanding member (24) has an essentially disc-shaped form with an areal extension (26). A reinforcement plate (28) is located inside the polishing or sanding member (24) in the areal extension (26). The reinforcement plate (28) has a central attachment portion (30) for releasable attachment of the polishing or sanding member (24) to the power tool (2). It is suggested that the central attachment portion (30) comprises at least one magnetic element (32) adapted for interaction with at least one respective magnetic element (34) directly or indirectly attached to a tool shaft (14) of the power tool (2) in order to hold and secure the polishing or sanding member (24) in respect to the tool shaft (14).

A work tool includes a spindle, a clamp shaft, a holding member, an engagement member and a first biasing member. The holding member has a pass-through part. The engagement member is rotatable around a driving axis relative to the holding member between a first position in which the engagement member is allowed to pass through the pass-through part and a second position in which the engagement member is engaged with the holding member. The engagement member allows the clamp shaft to move in an up-down direction relative to the holding member when located in the first position, and to prevent the clamp shaft from moving downward relative to the holding member when located in the second position. The holding member is configured to fixedly hold the clamp shaft relative to the spindle while being biased upward by the first biasing member, with the engagement member in the second position.

An abrasive finishing article with an adapter or hub to attach to an appropriate power tool, wherein the hub contains sets of slots to receive ribs positioned on a grinding wheel to permit adjustment of the height of the hub to change the overall height of the grinding wheel and abrasive finishing article.