Safety directional line for underground mining and method of mak

Details Safety directional line for underground mining and method of mak Safety directional line for underground mining and method of mak

1998-02-27

1999-11-23

Hirshfeld, Andrew

Signals and indicators

Indicators

By touch

116202, 116DIG17, 182 18, G08B 600

Patent

active

059881011

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 swivel hook or a solid fixed hook. The bronze ring and hook are non-sparking and non-corrosive.

REFERENCES:
patent: 257781 (1882-05-01), Sullivan
patent: 326616 (1885-09-01), Woodbury et al.
patent: 4179160 (1979-12-01), Sabo
patent: 4401050 (1983-08-01), Britt et al.
patent: 4844000 (1989-07-01), Clement
patent: 5027741 (1991-07-01), Smith et al.
patent: 5612665 (1997-03-01), Gerhardsen

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