A machine tool having a tool holder for exchangeably holding a tool is provided, the machine tool including: a machine tool housing; a spindle rotatably mounted in the machine tool housing a drive end being connected to a drive for rotating the spindle about an axis of rotation and a holding end being coupled to the tool holder; and a locking device arranged in the machine tool housing and which has a locking element reversibly movable between a release position and a locking position, a locking end of the locking element having an interlocking connector and the spindle having a mating interlocking connector, the interlocking connector being disengaged from the mating interlocking connector in the release position to enable rotational motion of the spindle, and the interlocking connector being engaged with the mating interlocking connector in the locking position to prevent rotational motion of the spindle and to enable an exchange of the tool of the tool holder, the locking device also including an electrically insulating mounting device for mounting the locking element in the machine tool housing to electrically insulate the locking element from the machine tool housing.

A support mechanism includes a fixed body, a rotating unit, a moving unit and a driving unit. The rotating unit is rotationally mounted to the fixed body. The moving unit, disposed at the fixed body, includes a ball screw spline shaft, a ball screw nut and a ball spline nut. The ball screw nut and the ball spline nut are both rotatably disposed at the ball screw spline shaft moved together with the rotating unit. The driving unit, disposed at the fixed body, includes a first driving member and a second driving member to rotate the ball screw nut and the ball spline nut, respectively. With different rotation pairs of the ball screw nut and the ball spline nut to the ball screw spline shaft, the ball screw spline shaft is driven to move, and the ball screw spline shaft is further to move the rotating unit.

A machine tool having a tool holder for exchangeably holding a tool is provided, the machine tool including: a machine tool housing; a spindle rotatably mounted in the machine tool housing a drive end being connected to a drive for rotating the spindle about an axis of rotation and a holding end being coupled to the tool holder; and a locking device arranged in the machine tool housing and which has a locking element reversibly movable between a release position and a locking position, a locking end of the locking element having an interlocking connector and the spindle having a mating interlocking connector, the interlocking connector being disengaged from the mating interlocking connector in the release position to enable rotational motion of the spindle, and the interlocking connector being engaged with the mating interlocking connector in the locking position to prevent rotational motion of the spindle and to enable an exchange of the tool of the tool holder, the locking device also including an electrically insulating mounting device for mounting the locking element in the machine tool housing to electrically insulate the locking element from the machine tool housing.

A support mechanism includes a fixed body, a rotating unit, a moving unit and a driving unit. The rotating unit is rotationally mounted to the fixed body. The moving unit, disposed at the fixed body, includes a ball screw spline shaft, a ball screw nut and a ball spline nut. The ball screw nut and the ball spline nut are both rotatably disposed at the ball screw spline shaft moved together with the rotating unit. The driving unit, disposed at the fixed body, includes a first driving member and a second driving member to rotate the ball screw nut and the ball spline nut, respectively. With different rotation pairs of the ball screw nut and the ball spline nut to the ball screw spline shaft, the ball screw spline shaft is driven to move, and the ball screw spline shaft is further to move the rotating unit.

A spindle device includes: a rotation shaft; a bearing housing having a cylindrical shape extending in a direction of a center axis of the rotation shaft; a bearing attached to an inner peripheral surface of the bearing housing and rotatably supporting the rotation shaft; and a first elastic member. A first flow path and a second flow path are formed inside the bearing housing, each of the first flow path and the second flow path extending in a direction of a center axis of the bearing housing. A first groove is formed in an outer peripheral surface of the bearing housing, the first groove extending in a peripheral direction of the bearing housing, the first groove being connected to the first flow path and the second flow path. The first elastic member closes an opening of the first groove.

A device for a machine tool is a device being attachable to an attachment portion of the machine tool, and including: a power receiving portion provided at a position facing a power supply portion provided on the machine tool along a direction intersecting a rotation axis of the device for the machine tool for receiving power from the power supply portion in a non-contact manner; a communication portion capable of communicating with a device external to the device for the machine tool; and a function portion that operates on the power obtained from the power receiving portion and communicates with the external device via the communication portion.

The present invention is an installation system for ceiling mounted items that is comprised of a tubular hollow extension. The first end of the tubular hollow extension is adapted to receive a suspension member and the second end is adapted to be attached to a drill bit or operated manually.