The System includes the drive tool (bit) and the screw head profil (drive) with an enlarged usable contact area, an axial alignment between screw and tool and a reliable stick-fit between screw head profil and tool. Reduce tool wear, use the versatility and test the system.
Even a 2.5 mm titanium-screw (see the video) with a penetration depth of only 1.3 mm, in this case in comparison with a 6 mm stainless steel wood screw, the screwdriver, which is much heavier, keeps it vertically without losing it.
Due to the converging surfaces as well as the special geometry between the tobi (screw head profil) and the tobi (tool) of the drive concept we were able to combine three main requirements. The axial alignment, the maximum contact area and holding the screw in the tool. All these advantages favor e.g. working over head with one hand as well as the automated screwdriving process.
During the insert of the tobi-tool in the screw-head drive the system will be axial aligned. This is e.g. an advantage for an automatically screw feed in with roboters and as well for critical application where it is not allowed to demage the screw- or nut thread. The converging surfaces ensure that the screws from the tobi tool can not drop out until the screw is thightened. Especially for working with one hand on a ladder over head. In addition no additional tap is required below the bit to stick-fit the screw (see picture).
To transmit the torque the load in the larger contact area of the tobi drive are comparatively lower and thus relieve the tension in the tool.
Because of the ten times higher (highlighted in red) contact area (Ac) between the tobi screw head profil and the bit compare to all other systems, the load for srewdrivers will be reduced extremely. The new design will significantly increase the service life of the tools and thus make a significant contribution to cost reduction.
Due to the much lower stress of the new drive system there is a possibility to reduce the drive size by one number, and/or the whole head geometry (depending on application). Model test FEM tightening torque of 10 Nm (according to class 8.8) and 22 Nm.
Head hight reduction for the low profile of the tobi screw head design. This is possible because of the larger drive contact area of the system between the drive and the bit.