Split Nut Assembly With Unequal Thread Pitches for Reusable Fastening

The patent applies asymmetry by setting different pitches for the bolt and nut. Specifically, the pitch of the bolt ridges is made different from the pitch of the nut ridges, creating an asymmetric relationship that prevents the nut from naturally loosening while still allowing it to be threaded onto the bolt. This asymmetric pitch design resolves the contradiction by maintaining both movability during assembly and stability during fastening.

The asymmetric pitch design between bolt and nut ridges ensures that when the ridges mesh, the contact is distributed more uniformly. By making the pitches different, the patent prevents the situation where one side has clearance while the other side contacts tightly, thereby improving ridge contact uniformity while maintaining ease of manufacture.

The asymmetric pitch design allows the nut to be detached even after painting. Because the pitches are different, the nut does not become permanently locked to the bolt when paint is applied. The nut can still be removed by applying sufficient force to overcome the paint film adhesion, enabling reuse and maintenance while still allowing for paint application during manufacturing.

The patent changes the pitch parameter of the nut to be different from the bolt pitch. This parameter change reduces the threading effort required, especially for long bolts, while maintaining the fastening capability. The different pitch creates a mechanical advantage that makes it easier to thread the nut along the length of the bolt.