Abstract: A pneumatic machine tool comprises a handle with one end being a first pivot connecting end, and a tool head. The handle comprises a main flow channel extending to the first pivot connecting end, and a switch assembly provided in the main flow channel. The tool head comprises a main body, a tool driving assembly disposed in the main body, and two pivot connecting arms formed on the main body and disposed side by side. The two pivot connecting arms are served as a second pivot connecting. The main body is formed with a chamber provided for disposing the tool driving assembly, and at least one secondary flow channel communicating with the chamber and extending to the two pivot connecting arms. The pivot shaft comprises a transfer flow channel and two transfer ports communicating with the channel.

Abstract: A output shaft rotation restriction structure of a hand-held machine tool having a shell, a drive shaft in the shell, and an output shaft in the shell, perpendicular to the drive shaft, provided with a grinding piece, and in linkage with the drive shaft via a steering gear set; two sides of the hand-held machine tool may be defined according to an extension line of the drive shaft. The output shaft rotation restriction structure includes a mounting hole on the shell, specifically, one of the two sides of the hand-held machine tool, a restriction hole on the output shaft and facing the mounting hole, and a rotation restriction group including a holder in the mounting hole, a restriction plug on the holder, and a spring, the restriction plug being forced into the restriction hole to interfere with the rotation of the output shaft.

Abstract: A protective cover assembled on an abrasive belt hand tool. The protective cover comprises an annular base and a tightening component. The annular base comprises a notch, a first clamping arm positioned on one side of the notch, and a second clamping arm positioned on the other side. The first clamping arm is formed with a through hole, the second clamping arm is formed with an assembly hole, the assembly hole does not penetrating through the second clamping arm. The annular base comprises a first state for tightening a protective cover mounting portion when the first clamping arm and the second clamping arm narrow the notch, and the annular base comprises a second state that the first clamping arm and the second clamping arm do not narrow the notch. The tightening component comprises a pull rod penetrating through the through hole and a piece arranged on the pull rod.

Abstract: A pneumatic reciprocating saw comprises a housing, a saw extending into the housing, a pneumatic motor assembled with the housing and a transmission assembly. The pneumatic motor comprises an output shaft, the transmission assembly comprises a driving bevel gear arranged on the output shaft, a transmission bevel gear engaged with the driving bevel gear, a driven rod being arranged on the transmission bevel gear, a pushing block being eccentrically arranged on the driven rod, a transmission rod assembled with the saw, and a thermal insulator sleeved on the transmission rod without being shifting along with the transmission rod. The transmission rod comprises a groove for placing the pushing block to slide therein, when the transmission rod is driven to reciprocate in a linear track, a tail end of the transmission rod not connected with the saw being limited by the thermal insulator to only move in the linear track.

Abstract: A pneumatic scissor tool comprises a tool housing, a movable blade and a power assembly, the tool housing comprises an assembly space, a mounting opening and a fixed blade, wherein the fixed blade is arranged at the mounting opening, the movable blade is arranged at the mounting opening corresponding to the fixed blade. Further, the power assembly comprises a pneumatic motor, a transmission shaft and an eccentric driving wheel. The eccentric driving wheel is connected with the transmission shaft and comprises an outer ring member, a bearing block, a column mounting space and a plurality of supporting columns, the outer ring member is used for pushing the movable blade, the bearing block is arranged in the outer ring member and installed in an eccentric manner with the transmission shaft, and the supporting columns is arranged in the column mounting space and are tightly connected with each other.