Chain saw with a tensioning assembly

A chain saw comprising:

• a mount supporting a sprocket driveable to rotate about a rotation axis;
• a guide bar having a longitudinal axis, the longitudinal axis extending through a distal end of the guide bar and through the rotation axis of the sprocket, the guide bar movable along the longitudinal axis with respect to the mount, the guide bar and the sprocket lying in a common plane;
• a saw chain trained around the sprocket and the guide bar;
• and
• a tensioning mechanism comprising:
• a spring;
• a support rigidly connected to the mount;
• a tensioning screw;
• and
• a tension bolt rigidly connected to the guide bar,
• wherein the spring biases the guide bar away from the mount along the longitudinal axis with a force that is adjustable by the tensioning screw,
• wherein the tension screw extends parallel to the longitudinal axis of the guide bar;
• and
• wherein the tensioning mechanism is in a direction oriented in the common plane transverse to the longitudinal axis, aligned with the longitudinal axis.