A spindle arrangement for a machine tool, comprising a spindle for driving a tool and at least one actuator for exciting vibration of the tool, characterized in that the spindle arrangement is provided with a compensation device for at least partly compensating the inertia forces produced by the vibration excitation in the spindle region.

A spindle arrangement for a machine tool, comprising a spindle for driving a tool and at least one actuator for exciting vibration of the tool, characterized in that the spindle arrangement is provided with a compensation device for at least partly compensating the inertia forces produced by the vibration excitation in the spindle region.

A power-driven reciprocating tool may include a transmission mechanism that converts rotational force from a motor to linear force to be output by a reciprocating mechanism coupled thereto, and a counterbalancing mechanism coupled to the transmission mechanism to counter-balance forces generated by the reciprocating mechanism. The transmission mechanism may include a planetary gear assembly including a sun gear in meshed engagement with at least one planet gear. In response to a force converted by and transmitted from the transmission mechanism, the reciprocating mechanism may move in a first linear direction, and the counterbalancing mechanism may move in a second linear direction, opposite the first linear direction. The opposite linear movement of the reciprocating mechanism and the counterbalancing mechanism may counteract forces generated by the reciprocating motion of the reciprocating mechanism, thus reducing vibration output by the tool.

A power-driven reciprocating tool may include a transmission mechanism that converts rotational force from a motor to linear force to be output by a reciprocating mechanism coupled thereto, and a counterbalancing mechanism coupled to the transmission mechanism to counter-balance forces generated by the reciprocating mechanism. The transmission mechanism may include a planetary gear assembly including a sun gear in meshed engagement with at least one planet gear. In response to a force converted by and transmitted from the transmission mechanism, the reciprocating mechanism may move in a first linear direction, and the counterbalancing mechanism may move in a second linear direction, opposite the first linear direction. The opposite linear movement of the reciprocating mechanism and the counterbalancing mechanism may counteract forces generated by the reciprocating motion of the reciprocating mechanism, thus reducing vibration output by the tool.

The present invention discloses a leveling device for adjusting an installation gap between a first component and a second component. The first component and the second component respectively have a cooperative installation surface, the cooperative installation surface of the first component is provided with at least one leveling device; the leveling device comprises a driving device installed in the cooperative installation surface of the first component and an adjustment head rotatably connected to the driving device, the adjustment head moves upwardly or retracts downwardly relative to the cooperative installation surface of the first component; the driving device drives the adjustment head to protrude outside an installation position thereof and abut with the second component located on an opposite side of the installation position of the adjustment head to adjust the gap between the first and second component. The present invention relates to an easy-to-level display screen using the leveling device.

The present invention discloses a leveling device for adjusting an installation gap between a first component and a second component. The first component and the second component respectively have a cooperative installation surface, the cooperative installation surface of the first component is provided with at least one leveling device; the leveling device comprises a driving device installed in the cooperative installation surface of the first component and an adjustment head rotatably connected to the driving device, the adjustment head moves upwardly or retracts downwardly relative to the cooperative installation surface of the first component; the driving device drives the adjustment head to protrude outside an installation position thereof and abut with the second component located on an opposite side of the installation position of the adjustment head to adjust the gap between the first and second component. The present invention relates to an easy-to-level display screen using the leveling device.

Disclosed is an oscillating power tool comprising: a housing; a motor; a drive shaft; an output shaft driven by the drive shaft to oscillate around its own axis at a certain angle of oscillation; an eccentric transmission mechanism converting the rotational movement of the drive shaft to the oscillation of the output shaft, wherein the eccentric transmission mechanism comprises an eccentric apparatus mounted on the drive shaft and a shift fork assembly respectively connected to the eccentric apparatus and the output shaft; and the eccentric apparatus comprises at least two drive members, the shift fork assembly comprises a first shift fork member and a second shift fork member, the first shift fork member has a first cooperating part cooperating with the drive member and a second cooperating part cooperating with the second shift fork member, and the second shift fork member is connected to the output shaft. The oscillating power tool further comprises an adjusting mechanism placed on the housing, wherein the adjusting mechanism operably adjusts the movement of the first shift fork member, such that the first cooperating part abuts a different drive member, the second cooperating part abuts a different position of the second shift fork member, and the output shaft has a different angle of oscillation.

An object of the present invention is to provide an electric power tool capable of automatically changing the rotating speed of an electric motor in accordance with operation conditions. The electric power tool 11 which carries out an operation of polishing, peel-off, cutting, or the like by swinging a tip tool 13 attached to a tool retaining 31 part within the range of predetermined angles by the drive power of the electric motor 12, wherein the electric power tool has a control device configured to indirectly detect the load of the tip tool from a current value, and to control the rotating speed of the electric motor 12 to a maximum rotating speed and a minimum rotating speed on the basis of the load of the tip tool 13.

An object of the present invention is to provide an electric power tool capable of automatically changing the rotating speed of an electric motor in accordance with operation conditions. The electric power tool 11 which carries out an operation of polishing, peel-off, cutting, or the like by swinging a tip tool 13 attached to a tool retaining 31 part within the range of predetermined angles by the drive power of the electric motor 12, wherein the electric power tool has a control device configured to indirectly detect the load of the tip tool from a current value, and to control the rotating speed of the electric motor 12 to a maximum rotating speed and a minimum rotating speed on the basis of the load of the tip tool 13.

A waterfowl decoy deployment system includes a thrust device and a hub coupled to the thrust device. The waterfowl decoy deployment system also includes a plurality of arms coupled to the hub such that the plurality of arms extend radially outward from the hub. The thrust device is configured to rotate about an axis to induce a substantially circular motion to the hub and the plurality of arms.