Connected screw threads
US5052871A · kind A · utility
3Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Jun 14, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D17/083
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A modified "Acme" type of male and female thread combination has a single-start male thread (10) of machined steel and a single-start female thread (12) of cast nodular graphite iron. The crown (20) of the female thread (12) is machined but the flanks (22, 22) and root (24) are left un-machined. There is plenty of clearance left between the crown (14) of the male thread (10) and the root (24) of the female thread (12). This reduces cost and yet the screw threads are adequate for use in a trench-box strut. The feed per revolution is 20 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.