Oct. 29, 1946. ' - E_ M, FARRls ' LUMINOUS MARKER FOR AIRPQRTS \ 2,410,277 4 Filed Feb. 7, 1945 ' IN VEN TOR.‘ E'M/L M FA RAMS . (1M; Patented Oct. 29, $1946 _ ' UNITED , ' ' 2,410,277‘ STATES " PATENT 2,410,277 OFFICE‘ ' ' LUMINOUS MARKER FOR AIRPORTS Emil M. Farris, Wayne, Pa. Application February 7, 1945, Serial No. 576,537 5 Claims. (01. 250-71) 1 2 This invention relates to markers, and more particularly to luminous markers which are espe cially useful in the dark. There are many applications of luminous markers in dark places for indicating the loca able, ?exible material depending upon the par ticular use or application for my improved marker, and the sheathing comprises a member formed of any one, or more of a number of trans parent, synthetic resins presently available. tion of objects, for de?ning prescribed areas, and Either between the core and the sheathing, or the like. One example of such use is in connec within the sheathing itself, I provide a lumi tion with airports. Most airports are enclosed nescent material which is clearly visible through by a fence or railing having towers rising there the sheathing. Thus, my improved marker can from or adjacent thereto, and generally there 10 be used effectively in the dark with the luminous are strung between these towers high tension material protected from the ambient or other, wires which have been the cause of frequent possibly deleterious forces. Where the core is an accidents because they are not clearly visible at electro-conductive member suitable as a high night. ' tension wire, it may be used around airports and When a pilot approaches an airport, he gener 15 will be clearly visible to pilots who are about to allycircles the ?eld once or twice in order to land, thereby serving as a warning that an ob observe the conditions at the ?eld preparatory struction is present. to landing. When he has appraised the situation The novel features that I consider character istic of my invention are set forth with particu to his'satisfaction, he must then devote his atten tion almost entirely to controlling the throttle, 20 larity in the appended claims. The invention adjusting the stabilizer, setting the rudders, etc. itself, however, both as to its organization and In concentrating on these items, the pilot-(par method of operation, as well as additional objects ticularly if he is a novice) tends to forget the and advantages thereof, will best be understood surrounding country, and especially the fact that from the following description, when read in there are strung between the aforementioned 25 connection with the accompanying drawing, in towers high tension wires which are not visible which inthe dark. Even the customary red warning Figure l is a view of one form of ?exible lights at the tops of the towers are inadequate to marker according to my present invention suit help the pilot locate the high tension wires for the able as a high tension wire, reason that the towers are spaced apart a sub Figure 2 is a perspective view illustrating an stantial distance and the wires sag more or less. airport around which a ?exible marker such as Many accidents have resulted when pilots have that illustrated in Figure 1 may be strung, run into such wires or similar obstacles. Figure 3 is a view similar to Figure 1 but show The primary object of my present invention is ing a modi?ed form of marker in which the core to provide an improved, luminous marker which 35 is constituted by a rope, and is useful in the dark and has many and varied Figure 4 is a view of still another modi?cation applications. . of my improved marker showing a different form More particularly, it is an object-of my present of sheathing from that shown in Figures .1 and 3. invention to provide an improved, luminous Referring more particularly to the drawing, marker which is especially useful in connection 40 there is shown a. marker I having a ?exible core with airports. constituted by ‘an electro-conductive wire or Another object of my present invention is to strands of wire 3 covered with a layer of insula provide an improved, luminous marker which can ' tion 5 of rubber or the like, in turn covered with be used outdoors and which will have a long life one or more layers of fabric 1. The outer layer even under the most adverse, climatic conditions. 45 of fabric 1 is coated with a layer of luminescent Still another object of my present invention is material 9 (exaggerated somewhat in the draw to provide an improved, luminous marker as ing for the sake of clearness). Around the aforesaid which can be fabricated with compara luminescent layer 9, I place a tubular sheathing tive ease, which is relatively inexpensive in cost, II of flexible, transparent material through and which is highly efficient in use. 50 which the luminescent material 9 is clearly vis In accordance with my present invention, I pro ible. The entire assembly constitutes an electric vide a marker having a ?exible core and a ?ex cable which can be strung between a plurality of ible, transparent sheathing around said core. towers l3 which skirt an airport l5 adjacent to a The core may comprise an electro-conductive fence I‘! around the border thereof. Pilots ap wire, a non-conductive rope, or any other suit 55 proaching the airport at night will have no (11111 2,410,277 3 4 culty locating the luminescent, high tension cable to the outer surface of the core or to the inner I and will therefore be able to avoid it when surface of the sheathing. If desired, the lumines cent material 9 may be dispersed throughout the landing. Moreover, it is apparent that the luminescent cable I will serve to effectively outline the perimeter of the air ?eld. The material of the sheathing Il may be con stituted by one or more of several transparent, synthetic resins which are now available. One example of such a resin is polyvinylidene chloride transparent material II in the course of manu facure thereof, in which case there will be no need to apply an additionall layer of luminescent material to the outer surface of the core. In any manufactured‘by the Dow Chemical Company of sheathing. Midland, Michigan and known commercially as “Saran.” This material is especially useful in connection with my improved, luminous cable for the reason that it is not only transparent, but case, it will be apparent that the luminescent material will be visible through the transparent A luminous, ?exible marker such as that de scribed above is useful in many applications. For example, it may be used in theatres as ?exible railings to close the aisles when necessary, in can be extruded in seamless tubes into which the 15 open air theatres known as "drive-in” theatres ?exible core can be readily inserted. This ma to mark off driving lanes or stalls for the automo terial also has very great tensile strength, will biles, 01‘ to mark off any other prescribed areas. not absorb moisture, has extreme impermeability Also, my improved marker may be used for deco to gases, is resistant to nearly all acids, bases, rative purposes, for lettering in outdoor adver— greases and oils, and resists many organic solv 20 tising devices and signs, etc. ents. ' Furthermore, this particular material, if Although I have shown and described several ignited,_it self-extinguishing, and, what is even embodiments of my present invention, it will un more important from the standpoint of its use doubtedly be apparent to those skilled in the art outdoors, it sheds dust and dirt quite readily. that many other modi?cations thereof, as well Thus, a sheathing of this material will fully pro 25 as variations in the particular forms described tect the luminescent layer 9 and, since it sheds herein, are possible. I therefore desire that my foreign matter, it will remain transparent for invention shall not be limited except insofar as clear visibility of the luminescent layer. is made necessary by the prior art and by the Another material which may be used for the spirit of the appended claims. ?exible sheathing II is a rubber hydrochloride 30 I claim as my invention: manufactured by the Goodyear Tire 8: Rubber 1. The combination with an airport skirted by Company, Inc. of Akron, Ohio, under the trade a plurality of towers of a ?exible marker con name “Plio?lm.” This material also has many nected between said towers, said marker compris of the desirable characteristics mentioned above ing a ?exible core constituting a first part, a in connection with “Saran” and can therefore be 35 transparent, ?exible sheathing surrounding said used to great advantage as a sheathing for my core and constituting a second part, and a lumin improved cable. escent material carried by one of said parts and visible through said sheathing. In the form of my invention shown in Figure 3, the ?exible core is constituted by a rope or rope 2. The combination with an airport skirted by like member 2I on which the layer of luminescent 40 a plurality of towers of a high tension cable con material 9 is applied. The sheathing II is then nected between said towers, said cable compris placed over the luminescent layer 9 in any con ing a ?exible core including an electro-conductive venient manner. The rope-like member 2| of material, said core constituting a ?rst part, a this form of my invention may be constituted by ?exible, transparent sheathing surrounding said rope made of ?bers, steel or other suitable metal, 45 core and constituting a second part, and a lumin or the like, or it may be constituted of string, escent material carried by one of said parts and visible through said sheathing whereby said cable cord, line, etc. In both forms of the invention shown in Figures is adapted to serve as a luminous marker outlin 1 and 3, the ?exible sheathing II is made in the ing said airport during darkness. form of a tube which is slipped over the ?exible 50 3. The invention set forth in claim 2 charac core. The sheathing l I of Figure 4, on the other terized in that said luminescent material is in hand, may be applied to the ?exible core in the terposed between said core and said sheathing. form of a strip of ?exible, transparent material 4. The invention set forth in claim 2 character which is wound in spiral fashion around the ized in that said luminescent material is consti ?exible core with the edges of adjacent turns of 5-5 tuted by a coating on the outer surface of said the spiral overlapping each other. The overlap core. ping edges may be bonded to each other by the 5. The invention set forth in claim 2 character application of heat and pressure in suitable dies, ized in that said luminescent material is consti whereupon the sheathing is formed into one uni tuted by a coating thereof on the inner surface tary member. With either form of the invention, 60 of said sheathing. the luminescent material 9 may be applied either EMIL M. FARRIS.