Pneumatic screwer

A pneumatic screwing device, comprising

• a main body;
• a spindle for rotatably supporting a screwing tool, said spindle projecting from a first end portion of said main body;
• a rotor that is pneumatically rotatable for rotating said spindle;
• a stator for housing said rotor, a gap being defined between said rotor and said stator for receiving pressurized air;
• a supply conduit element arranged in said stator for delivering said pressurized air into said gap;
• a discharge conduit arranged in said stator for discharging said pressurized air from said gap;
• a cover positioned in a second end portion of said main body opposite said first end portion;
• a handle connected with said second end portion of said main body;
• a switch for switching a screwing direction of said screwing device, said switch comprising a cylindrical slider which is slidable within said main body between an operating position in which said screwing device operates in a first screwing direction and a further operating position in which said screwing device operates in a further screwing direction, said slider containing three spaced seats arranged for engaging with a locking device slidably associated with said main body for maintaining said switch in said operating position corresponding to a desired screwing direction of said screwing device, wherein said three seats are arranged in sequence along said cylindrical slider and said locking device engages, in each operating position, two of said three seats;
• and said cover containing an expansion chamber positioned on an opposite side of said spindle with respect to said rotor and in flowing communication with said discharge conduit for expanding said pressurized air, at least one first opening arranged on one side of said handle, and at least one second opening arranged on a side of said handle opposite said first opening, said at least one first and second openings affording flowing communication between said expansion chamber and the atmosphere.