Tubular coupler for concrete reinforcing bars
US5909980A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1997 |
| Grant date | Jun 8, 1999 |
| Priority date | — |
| Expiry date | Sep 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7041
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An elongated tubular metal body includes a longitudinally extending wedge portion having converging inner wedging surfaces defining an included angle of less than seventy degrees for receiving the end portions of concrete reinforcing bars. A series of longitudinally spaced threaded holes are formed within the tubular body in opposing relation to the wedge portion, and a socket head set screw or a shear head screw is threaded into each hole. The screws have conical pointed tips for penetrating a bar when the screws are tightened to a predetermined torque, and the screws force the outer ribs on the bar into the tubular body. In one embodiment, a section of cylindrical seamless tubing of ductile steel is cold-forged or deformed within a die set to form the tubular body with a generally diamond-shaped cross-sectional configuration. In another embodiment, the tubular steel body has thicker wall portions in the areas of the wedging surfaces and threaded holes and defines a chamber having a clover leaf cross-sectional configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.