Power tool

A power tool comprising:

• a housing;
• a spindle supported in the housing to be pivotable or rotatable around a driving axis that defines an up-down direction of the power tool, a tool mounting part to which the tool accessory is removably attachable being defined at a lower end portion of the spindle;
• a clamping shaft that is selectively movable in the up-down direction relative to the spindle, the clamping shaft including a shaft part extending coaxially with the spindle in the up-down direction and a clamping head connected to the shaft part below the tool mounting part;
• a spring;
• a spring seat abutting on an upper end of the spring and operably connected to the clamping shaft, the spring seat being selectively movable in the up-down direction relative to the spindle and being configured to interrupt transmission of biasing force originating from the spring to the clamping shaft while moving downward from its uppermost position relative to the spindle;
• and
• an actuator that is movable in the up-down direction relative to the spindle;
• wherein:
• the spring seat is configured to be selectively lockable to the spindle at a locked position that is below its uppermost position in the up-down direction while transmission of the biasing force originating from the spring is being interrupted, and
• the actuator is configured to move upward from its lowermost position in response to being pressed upward to thereby unlock the spring seat from the spindle.

A power tool comprising:

• a housing;
• a spindle supported in the housing to be pivotable or rotatable around a driving axis that defines an up-down direction of the power tool;
• a tool mounting part provided at a lower end portion of the spindle in the up-down direction, the tool mounting part being configured to have a tool accessory removably mounted thereon;
• a clamping shaft that is selectively movable in the up-down direction relative to the spindle;
• a spring generating an upward biasing force in the up-down direction;
• a spring seat radially surrounding the clamping shaft and abutting on an upper end of the spring, the spring seat being selectively movable relative to the spindle in the up-down direction between an unlocked position where the spindle is movable relative to the spring seat in the up-down direction and a locked position where the spring seat is immovable relative to the spindle in the up-down direction;
• and
• an actuator shaft that is selectively movable in the up-down direction relative to the spindle;
• wherein:
• the spring seat is disposed within a force transmission path that receives the upward biasing force originating from the spring and outputs an upward biasing force to the clamping shaft in the up-down direction,
• downward movement of the spring seat relative to the spindle in the up-down direction from the unlocked position to the locked position causes the transmission of biasing force along the force transmission path to the clamping shaft to be interrupted, and
• upward movement of the actuator shaft relative to the spindle in the up-down direction causes the spring seat to move from the locked position to the unlocked position.