Screw with groove for self-lock and method and rolling flat die for manufacturing the same
US4764067A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1986 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Sep 19, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B39/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A self-locking screw has a longitudinal axis and comprises a thread having an inner radial portion and an outer radial portion, the inner radial portion having a pair of opposite first side faces defining a flank angle of the screw. The outer radial portion has a pair of opposite second side faces extending from the first side faces and first and second outer radial faces extending respectively from the pair of opposite second side faces. The thread has a central buffer groove having two groove side walls, the groove side walls along with the second side faces and the first and second outer radial faces defining two axial spaced elastically deformable thread portions which are elastically deformable such that as the thread is threaded onto a counterpart threaded member, the elastically deformable thread portions are engaged by the counterpart threaded member to cause elastic deformation as the thread portions axially approach one another and reduce the spacing between the thread portions. The inner radial portion of the thread is rigid to retain its initial configuration after having been threaded onto the threaded counterpart, whereby the outer and inner radial portions provide th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.