摘要:
A screwdriver bit (50) fitted to a screw wherein generally vertical end wall parts of a specified depth are formed in the bit fitting grooves of a screw head part at the end edge parts, a generally flat bottom part is formed directing from the lower edge part of the vertical end wall parts to the center part of a crew neck part, and a conical bottom surface is formed at its center part, comprising flat blade parts (52) forming, at the top end parts, generally vertical end edge parts fitted into the bit fitting grooves of the screw head part along the vertical end wall parts, the top end surfaces of the flat blade parts being formed in a conical protruded part (54) having an inclination angle θ of approx. 1 to 45° relative to the horizontal plane, whereas the screw having stage parts at the end edge parts of the bit fitting grooves of the screw head part, forming inclined groove parts extendedly directing from these stage parts to the center part of the screw neck part, forming a generally conical bottom surface at its bottom part, and forming wall parts recessed inward from a vertical plane at the end edge parts of the bit fitting grooves through a specified depth.
摘要:
A screwdriver bit (50) fitted to a screw wherein generally vertical end wall parts of a specified depth are formed in the bit fitting grooves of a screw head part at the end edge parts, a generally flat bottom part is formed directing from the lower edge part of the vertical end wall parts to the center part of a crew neck part, and a conical bottom surface is formed at its center part, comprising flat blade parts (52) forming, at the top end parts, generally vertical end edge parts fitted into the bit fitting grooves of the screw head part along the vertical end wall parts, the top end surfaces of the flat blade parts being formed in a conical protruded part (54) having an inclination angle θ of approx. 1 to 45° relative to the horizontal plane, whereas the screw having stage parts at the end edge parts of the bit fitting grooves of the screw head part, forming inclined groove parts extendedly directing from these stage parts to the center part of the screw neck part, forming a generally conical bottom surface at its bottom part, and forming wall parts recessed inward from a vertical plane at the end edge parts of the bit fitting grooves through a specified depth.
摘要:
An automatic screw driver and a method for controlling the same, characterized by a fluid chamber (56) in which a suction force is developed so as to retain stably a screw (S) at a predetermined position irrespective of kind of material for the screw preparatory to a screwing operation of the driver, and a control circuit including a plurality of timers (T64,T66,T68,T70,T72) in order to perform a sequential operation consisting of steps of supplying the screw at the tip end of a bit (14), retaining perpendicularly the screw there and entering a standby state for the screwing operation, and actuating a driver when the sequential operation is completed, so that the screwing operation is facilitated and stabilized, resulting in a considerable improvement in the efficiency thereof.
摘要:
A screwdriver bit configured in such a way that when the tip of the screwdriver bit is to be fitted into a bit fitting groove of a screw, said bit fitting groove being formed on the top surface of the head of the screw, then damage is prevented from occurring on the top surface of the head of the screw, and proper fitting of the tip of said bit into the bit fitting groove is promptly and smoothly accomplished, with the result that the efficiency and safety of screw tightening work are significantly enhanced. This driver bit (30) is provided with a cross-shaped tip edge which is to be fitted into the bit fitting groove provided on the top surface of the head of the screw, said bit fitting groove consisting of a cross-shaped groove. In this driver bit (30), the tip surface of said tip edge (31) is formed as a whole into a spherical surface shape (34) by means of planishing.