Percussion tool

A percussion tool adapted to impart axial impacts to a tool bit, the percussion tool comprising:

• a housing;
• a motor supported by the housing;
• a spindle supported by the housing and including a plurality of radial air vents;
• a reciprocation mechanism operable to create a variable pressure air spring within the spindle;
• a striker received within the spindle for reciprocation in response to a pressure of the variable pressure air spring;
• an anvil received within the spindle and configured to be impacted by the striker, the anvil configured to transmit axial impacts from the striker to the tool bit;
• a chuck for securing the tool bit to the spindle;
• and
• a parking assembly movable relative to the spindle to selectively open and close the plurality of radial air vents, the parking assembly including
• a seat coupled to the spindle,
• a first shuttle portion movable relative to an outer surface of the spindle,
• a biasing member positioned between the seat and the first shuttle portion,
• a second shuttle portion movable relative to the outer surface of the spindle,
• an elastomeric ring positioned between and contacting the first shuttle portion and the second shuttle portion, and
• a fastener that couples the second shuttle portion to the anvil,
• wherein the first shuttle portion, the elastomeric ring, and the second shuttle portion are movable together between a working position, in which the plurality of radial air vents is closed, and an idle position, in which the plurality of radial air vents is open, and wherein the biasing member is configured to bias the first shuttle portion and the second shuttle portion into the idle position.

A percussion tool adapted to impart axial impacts to a tool bit, the percussion tool comprising:

• a housing;
• a motor supported by the housing;
• a spindle supported by the housing and including a plurality of radial air vents;
• a reciprocation mechanism operable to create a variable pressure air spring within the spindle;
• a striker received within the spindle for reciprocation in response to a pressure of the variable pressure air spring;
• an anvil received within the spindle and configured to be impacted by the striker, the anvil configured to transmit axial impacts from the striker to the tool bit;
• a chuck for securing the tool bit to the spindle;
• and
• a parking assembly movable relative to the spindle to selectively open and close the plurality of radial air vents, the parking assembly including
• a seat coupled to the spindle,
• a shuttle movable relative to an outer surface of the spindle, the shuttle including a first end, a second end opposite the first end, an inner surface that extends between the first end and the second end, and an annular recess in the inner surface adjacent the first end,
• an elastomeric ring positioned within the annular recess,
• a biasing member positioned between the seat and the shuttle, and
• a fastener that couples the shuttle to the anvil,
• wherein shuttle is movable between a working position, in which the plurality of radial air vents is closed by the elastomeric ring, and an idle position, in which the plurality of radial air vents is open, and wherein the biasing member is configured to bias the shuttle into the idle position.