Multi-headed screw
US4504180A · kind A · utility
19Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1982 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Feb 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/91
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw member having a plurality of heads by providing one or more thin neck portions to be sheared at a predetermined torque, in which a collar having a skirt portion with its one part being cut away is fitted on the thin neck portion from the lateral side to expose the outer head part alone and to engage the cap member fitted from the side of the bearing surface of the inner head part of the screw member, and the cap member is inserted between the skirt of the collar and the inner head part to thereby prevent the collar from slipping out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.