Screwdriver

A screwdriver comprising:

• a grip which is a substantially cylindrical body having a top face formed with multiple annularly arranged chambers, a cap member covering the chambers, a bottom of the grip being formed with a coaxial fitting socket, the fitting socket being isolated from the chambers by a diaphragm, the grip being further formed with a coaxial through hole;
• a connecting stem having a polygonal cross-section, an upper section of the connecting stem being fitted in the through hole of the grip, a bottom of the connecting stem having an enlarged end with a larger diameter, a spring being fitted around the connecting stem, a top end of the spring abutting against the diaphragm;
• a receiving member which is a substantially cylindrical body having an upper section fitted in the fitting socket of the grip, a top face of the receiving member abutting against a bottom end of the spring, a periphery of the receiving member being formed with multiple axially extending receptacles, a bottom of the receiving member being formed with a flange, the receiving member being further formed with a coaxial through channel, an upper section of the through channel being small diameter polygonal hole, the enlarged end of the connecting stem being received in the through channel, a transparent cylindrical stopper member being fitted around the receiving member, one side of the stopper member being formed with an axial slot;
• a transmission shaft having a substantially polygonal cross-section, an upper section of the transmission shaft being separably connected with the enlarged end of the connecting stem, a bottom end of the transmission shaft being connected with a screwdriver connecting rod;
• and
• a rotary wheel disposed at the bottom of the receiving member, having a fixing plate fixed with the receiving member, the fixing plate being formed with a coaxial through aperture smaller than the through channel of the receiving member, two opposite planet gears being fixedly disposed on bottom face of the fixing plate, inner sides of the planet gears meshing with a sun gear fixed on the transmission shaft, outer sides of the planet gears meshing with internal teeth of the rotary wheel, a bottom end of the rotary wheel sleeving the screwdriver connecting rod, the rotary wheel and the transmission shaft being restricted by each other via a latch ring.