Safety directional line for underground mining and method of making same
US5988101A · kind A · utility
Inventors
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S116/17
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A safety directional line for underground mining that can be adjusted during to conform with any local codes. The line is constructed from high strength polypropylene which is non-conductive. A flame retardant is added to the polypropylene to make it flame resistant. There are flame retardant and non-conductive directional indicator cones evenly spaced and positioned such that they are pointing along the axis of the line. The cones are placed on the line such that when someone is exiting the mine his hand slides along the slope of the cone and meets little resistance. In the event that the miner is traveling the wrong direction, his hand will meet the flat surface of the cone and come to a stop, indicating that he is traveling in the wrong direction. There is fluorescent tape on the cones to make it more clearly visible to one trying to exit the mine. The tape is formed in an X on the flat surface of the cone indicating that it is the wrong direction. Additionally, the tape is placed parallel to the axis of the cone along the conical surface indicating the correct direction of travel. The rope is connected at one end by a solid bronze ring and at the other end by a solid bronze swi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.