SCREW

• Main Author: HATANO ATSUMI
• Format: Patent
• Language: English
• Published: 06.07.1999
• Edition: 6
• Subjects: BLASTING; DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To screw a male screw into a female screw without causing a cut into the female screw. SOLUTION: A spherical guide part 16 is provided at the tip part of a screw body 12 through a constricted part 15. The diameter of the constructed part 15 is determined to be not larger than the root diameter of a male screw 11, and the diameter of the guide part 16 is determined to be larger than the inside diameter of a female screw 18 and larger than the root diameter of the male screw 11. Even when the guide part 16 is inserted into a screw hole 17 with the screw body 12 tilted considerably largely, the guide part 16 can be smoothly inserted into the screw hole 17 without being caught by the screw thread of the female screw 18 since the guide part 16 is spherical. Further, since the diameter of the guide part 16 is determined to be larger than the root diameter of the male screw 11 and not larger than the inside diameter of the female screw 18, an accuracy of alignment (concentricity) of the guide part 16 with the screw hole 17 is high, and thus the screw body 12 can be smoothly screwed into the female screw 18 while the male screw 11 is positively prevented from cutting into the female screw 18.