Generally, the electric screwdriver or electric drill with torque regulation is very convenient and fast for the upper screw. The screwdriver and batch head can be avoided by using appropriate torque gear.

Figure 1:

The power output is very simple.

The principal cam and the principal axis are linked. When it turns the principal axis, it stops the principal axis.

The spindle gear of the drill bit will rotate idly without pressing the cylindrical cam beads to the left side of the ejector rod and sheet.

Fig. 2:

Cylindrical cam beads are embedded in the spindle gears. There are several beads in the beads. Its function is to catch the spindle cam and transmit the power of the spindle gear of the drill bit to the spindle.

Fig. 3:

The contact surface between the cylindrical cam beads and the spindle cam is very smooth. The purpose is to skip and skip with the spindle cam when the spindle cannot rotate under the external force. This is the reason why when the upper screw is tightened, it will make a beep sound.

The tighter the spring adjusts, the greater the pressure on the top rod and the pressing plate, and the less skidding space (depth) of the cylindrical cam beads and the spindle cam, the greater the torsion of the spindle. When the spring adjusts to the tightest point, the skidding space (depth) of the cylindrical cam beads and the spindle cam is basically zero. At this time, the output torsion is the greatest, and can not be pinched by hand. Electric drill gear

Fig. 4:

Torque adjustment and selection of different gears can adjust the pressure and space of the beads of the cylinder cam to the springs, the ejector rods and the pressing sheets, thus controlling the magnitude of the moment.