F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 25/02 (2006.01) F16B 25/10 (2006.01) F16B 35/06 (2006.01)
Patent
CA 2225056
The shank portion of a screw has a surface formed with a screw thread throughout the length thereof and a lower section formed with a flute at the surface thereof. The flute extends from a tip of the shank portion and has a longitudinal length which is inclined with respect to a longitudinal axis of the shank portion. The flute is defined by a planar side wall, which is inclined relative to the longitudinal axis, and a curved bottom. The planar side wall has a surface with screw thread portions that are disposed in a staggered arrangement in a direction receding from a direction of screw advancing rotation. The flute has a depth which decreases gradually from the tip of the shank portion, and which has a maximum value equal to radius of the shank portion. The longitudinal length of the flute forms an angle ranging from 12° to 32.5° with the longitudinal axis. The screw further has a head portion with an annular skirt adjacent to the shank portion. The annular skirt has one side which is formed with an annular recess around the shank portion and a plurality of radial teeth in the annular recess.
Chen Sen-Yang
Cheng Chao-Tai
Chen Sen-Yang
Macrae & Co.
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