Screw and corresponding punch

Abstract

Disclosed is a screw. The screw includes a rod body and a head formed at the upper end of the rod body. The top surface of the head is provided with a driving groove. The groove includes a central area, multiple peripheral areas and multiple connecting areas. The central area penetrates into the head and is provided with a groove bottom. The multiple peripheral areas extend radially outward from the central area and separately surround the central area. Each peripheral area is defined by two separated sidewalls and an arc wall connecting the outer ends of the two sidewalls. Each connecting area is connected between the inner ends of the adjacent two sidewalls of the adjacent two peripheral areas. Each connecting area is defined by an arc wall. An arc junction is formed by the two side endsof each arc wall and the inner end of the sidewall of the peripheral area connected to the arc wall. The invention also provides a corresponding punch used for forming the groove of the screw of theinvention.

Description

technical field [0001] The present invention relates to a screw with a driving groove on the head and a corresponding punch, especially to a screw whose head groove is substantially cross-shaped or torx-shaped. Background technique [0002] figure 1 A screw head 10 is shown. The top surface 12 of the head 10 has a driving groove 14 for inserting a joint blade (not shown) at the front end of the screw head to drive the screw to rotate. Groove 14 can be figure 1 The cross-shaped shown is or the hole of the type such as inline, square, hexagonal, plum blossom etc. However, conventional screwdriver bits for mating screwdriver bits are generally limited to having corresponding mating edges. For example, the cross-shaped groove is only suitable for aligning and inserting the cross-shaped coupling edge, which is inconvenient for the insertion operation. Furthermore, the driving torque point of the cross-shaped joint blade inserted into the cross-shaped groove is small, which ca...

AI Technical Summary

Problems solved by technology

However, the screwdriver bits that are commonly used with screw drive grooves are usually limited to having corresponding mating blades

For example, the cross-shaped groove is only suitable for providing a cross-shaped joint blade alignment insertion, which is not convenient for the insertion operation

Furthermore, the driving torque point of the cross-shaped joint blade inserted into the cross-shaped groove is small, and sufficient torque cannot be generated, and the groove and the joint blade are easily damaged, reducing the service life

In addition, the combination of the cross-shaped joint blade inserted into the cross-shaped groove does not produce an interference fit. Therefore, if the two can be combined without separation, it is usually assisted by the suction force of a magnet, resulting in an increase in manufacturing costs.

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