Bolt & Nut
AssigneeIwata Bolt Kabushiki Kaisha
InventorKiyotaka Iwata
Life of this patent
Estimating the term…
Abstract
A bolt and nut can be smoothly engages with a mating nut and a mating bolt, respectively, even if the threads of the mating nut and the mating bolt have metal particles or paint particles sticking thereto. The bolt has a regularly threaded part (3) capable of being regularly engaged with the mating nut, and a cylindrical guide part (4) extending from the regularly threaded part and having a diameter smaller than the minor diameter of the internal thread of the mating nut. A slot (5) is formed in the end surface of the cylindrical guide part.
Claims16
A bolt having:
- a regularly threaded part provided with a regular external thread capable of being regularly engaged with an internal thread formed in a mating nut;
- and
- a cylindrical guide part having a diameter smaller than a minor diameter of the internal thread of the mating nut and contiguous with the regularly threaded part;
- wherein the cylindrical guide part is provided with a recess in its end surface.
A nut provided with a threaded bore having an internal thread that can be engaged with an external thread of a mating externally threaded member;
- wherein the threaded bore has a leading part that is engaged first with the external thread of the mating externally threaded member, provided with a plurality of recesses having a length equal to at least one pitch of the internal thread and arranged at equal angular intervals, and a regularly threaded part capable of being engaged with the external thread of the mating externally threaded member and continuous with the leading part.
A bolt having:
- a head against which a fastening tool is pressed to screw the bolt in a threaded bore of a mating nut provided with an internal thread;
- a cylindrical guide part of a diameter smaller than a minor diameter of the internal thread of the nut;
- a regularly threaded part that engages regularly with the internal thread of the nut;
- and
- a threaded guide part formed between the cylindrical guide part and the regularly threaded part, provided with an external thread having rounded crests and having a major diameter greater than the diameter of the cylindrical guide part and smaller than a major diameter of the external thread of the regularly threaded part.
The major diameter of the external thread of the threaded guide part at a position on the axis nearer to the head of the bolt is greater than that of the same at a position on the axis nearer to the extremity of the bolt, and the external thread of the threaded guide part has at least two major diameters.
Dependencies are inferred from the claim text.