Abstract: A power tool includes a main body, a power input shaft unit having a driving bevel gear, and a power output shaft unit having a driven bevel gear to mesh with the driving bevel gear. The center of the power input shaft unit defines a first axis. The center of the power output shaft unit defines a second axis. The main body has an elbow portion corresponding in position to the intersection of the first axis and the second axis. An outer circumference of the elbow portion has a first plane parallel to the second axis and a second plane parallel to the first axis. The first plane is located between the second axis and the driving bevel gear. The second plane is located between the first axis and the driven bevel gear. The first plane and the second plane collectively define a recessed space.

Abstract: A head structure of a pneumatic tool has an accommodation room in a pneumatic tool body. A driving gear and a transmission unit are pivoted in the accommodation room. The transmission unit includes a gear member having a transmission gear to mesh with the driving gear. The rear end of the gear member is provided with a gear rod. A bearing fitted on the gear rod is limited to a first limit portion at the distal end of the transmission gear. The gear rod is connected with a connection member which has a second connection portion to engage with the first connection portion. The connection member has a second limit portion adapted to limit another side of the bearing. The limit member is secured to the distal end of the accommodation room. The limit member is adapted to limit the bearing in the accommodation room.