as required , detailed embodiments of the present invention are disclosed herein ; however , it is to be understood that the disclosed embodiments are merely exemplary of the invention , which may be embodied in various forms . therefore , specific structural and functional details disclosed herein are not to be interpreted as limiting , but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure . there are many methods for continuously forming a reinforced flexible hose , one such method may be seen in u . s . pat . no . 4 , 213 , 811 , invented by marcus hall , the disclosures of which are herein incorporated by reference . another method may be seen in u . s . pat . no . 3 , 155 , 559 , also invented by marcus hall , the disclosures of which are incorporated by reference . one may implement any of the aforementioned methods of forming stretch hoses , or other methods not yet known at this time , the crux of the present invention is not the method of forming the stretch hose , but the unique placement of the reinforcing wire and the current carrying wire . as seen in fig3 - 7 , is the electrical stretch hose 10 of the present invention . electrical stretch hose 10 includes an outer shell material 20 , an inner core material 30 , a reinforcing helical wire 40 , and a current carrying wire 50 . in other embodiments one may add additional current carrying wires as needed . directing one &# 39 ; s attention to the drawing marked fig3 , one can see a cross - sectional view of electrical stretch hose 10 . electrical stretch hose 10 may be generally cylindrical in shape , as seen in fig4 - 7 , however , one may implement any suitable shape known in the art including , but not limited to a square , rectangle , and the like . electrical stretch hose 10 may have an outer shell material 20 , as seen in fig5 and 6 . electrical stretch hose 10 may have two open ends , which may be used for attaching electrical hose 10 to the desired device being used , also see in fig5 and 6 . outer shell 20 may be manufactured from a variety of different materials , such as resins , pvc , soft plastics and the like . in the preferred embodiment one implemented a thermoplastic material for outer shell 20 . one may implement any suitable color known in the art including , but not limited to black , red , or the like . conversely , one may implement a transparent outer shell , if desired . in the preferred embodiment one implemented a black thermoplastic . again directing one &# 39 ; s attention to fig3 , electrical stretch hose 10 also includes inner core material 30 . inner core 30 may be manufactured from any suitable known material in the art including , but not limited to resins , pvc &# 39 ; s , soft plastics and the like . in the preferred embodiment one implemented the same type of thermoplastic material used for outer shell 30 . inner core 30 and outer shell 20 may be bonded or fused together by any suitable known means in the art including , but not limited to heat fusion , adhesives and the like . in the preferred embodiment one bonded outer shell 20 to inner core 30 via heat fusion . furthermore , one may use multiple layers of thermoplastic material for outer shell 20 and inner core 30 . for example ,. one may have a stretch hose with two layers of thermoplastic material bonded together , for outer shell 20 , and three layers of thermoplastic material bonded together , for inner core 30 . the need for more then one layer of material , for either outer shell 20 or inner core 30 , will depend on the desired use of the stretch hose . electrical stretch hose 10 may also include a helical reinforcing wire 40 . helical wire 40 is the skeleton of electrical stretch hose 10 . helical wire 40 may be manufactured from any suitable known material in the art , including , but not limited to metal , metal alloy , hard plastic , and the like . in the preferred embodiment one implemented an insulated copper wire . insulation 41 may have an inner diameter so as to be able to cover helical wire 40 , as seen in fig3 . insulation 41 may have outer circumferential surface 42 and inner circumferential surface 42 a . this type of wire was preferred because one desired helical wire 40 to be a current carrying wire . one could however , implement a helical wire made out of plastic , pvc , or any other non - conductive material . one key attribute of helical wire 40 is that it must be able to expand and contract , like a helical spring . another key attribute of helical wire 40 is that it must be able to support outer shell 20 and inner core 30 . helical wire 40 may be attached to inner core material 30 by any known suitable means in the art including but not limited to heat fusion or welding and adhesion with adhesives . in the preferred embodiment one attached outer surface 42 of insulation 41 of insulated helical wire 40 to inner core material 30 via heat fusion , as seen in fig3 . in another type of embodiment one could have sandwiched helical wire 40 between inner core material 30 and outer shell material 20 . in yet another embodiment one may implement more - then one helical wire , for example one may implement a stretch hose with two helical wires . as mentioned above one may have one helical current carrying wire , or one may have many current carrying wires . in the preferred embodiment one implemented a single current carrying wire , as seen in fig6 and 7 . an embodiment with more than one current carrying wire may be seen in fig4 and 5 . in this embodiment one implemented two current carrying wires . other then the number of current carrying wires used the two embodiments of the present invention operate identically . as just mentioned , in addition to having helical wire 40 one may implement a second wire 50 . second wire 50 may be conductive or non - conductive , depending on the desired application . in the preferred embodiment one implemented a helical current carrying second wire 50 , i . e . conductive . since helical second wire 50 will be implemented as a current carrying wire , it will be insulated , and as such has insulation 51 along with outer and inner surfaces 52 and 52 a respectively , as seen in fig . 3 . second wire 50 may be attached to electrical stretch hose 10 by any suitable method known in the art including , but not limited to the methods mentioned above . in the preferred embodiment one sandwiched second wire 50 between outer shell 20 and inner core 30 . one would like to point out that one could have easily attached second wire 50 in the same manner as helical wire 40 . in normal operation when the electrical stretch hose is in a contracted position , as seen in fig3 , 4 and 7 , there will be a plurality of hills 70 and valleys 71 , the number of hills 70 and valleys 71 will depend on the length of the electrical stretch hose desired , i . e . the longer the length the more hills and valleys that will be present . the distance between hills will vary depending on the corresponding shrinkage force of the helical wire implemented and the type of material used for the outer and inner material . thus , a helical wire with greater shrinkage force will have less distance between adjacent hills . when electrical stretch hose 10 is in a contracted position , second wire 50 will be positioned under and to the right of helical wire 40 , as seen in fig3 . in addition , a portion 60 of outer shell 20 and inner core 30 will form an angular fold over second wire 50 , as seen in fig3 . another portion 61 of outer shell 20 and inner core 30 remains fixed . the angular folding of portion 61 of electrical stretch hose 10 allows for maximum contraction , and thus increases the stretch ratio . when electrical stretch hose 10 is in a stretched position , the distance between the hills and valleys is increased as seen in fig5 and 6 . in addition , located in each valley 71 there may be a ridge 71 a . ridges 71 a are formed by second wire 50 , as seen in fig5 and 6 . ridge 71 a cause the material of the stretch hose to fold , when the stretch hose goes from an extended position to a retracted position . located at the lowest point of each valley 71 may be base portion 71 c . in addition to the hills 70 and valleys 71 located on outer shell 20 , there may be hills 80 and valleys 81 located on inside core 30 , as seen in fig3 . drawing one &# 39 ; s attention to fig3 - 7 , one will now discuss the angular fold of the present invention with one current carrying wire in more detail to give the reader a better understanding on how the present invention improves on the prior art electrical stretch hoses , keeping in mind that the angular fold with two current carrying wires is identical . for illustrative purposes helical reinforcing wires 40 are represented by a , b , c and d . a , b , c and d are all aligned along the same central axis , as depicted in fig . 3 . also , current carrying wire 50 , now represented by a ′, b ′, c ′ and d ′ are also aligned along the same central axis . fig3 will be considered one array of the many arrays present in the electrical stretch hose . when the electrical stretch hose of the present invention is in a retracted position , a ′ will be located below and between a and b . in addition , b ′ will be located between b and c , and so forth . this will continue down the length of the hose , because of the symmetrical configuration of the hose , that is to say each portion on electrical carrying wire will be located below and between two corresponding reinforcing wires in different arrays . when the electrical stretch hose is in an extended position , b ′ will be located between a and b , c ′ will be located below and between b and c and so forth down the length of the hose , for the foregoing reasons . the reason for this “ shift ” is because of the positioning of the current carrying wire and the reinforcing wire . in another embodiment one may also have the current carrying wire “ shift ” across more then one portion of the helical wire . for example , in the preceding example when the stretch hose is in an extended position , c ′ may be located between b and c , as previously discussed , however if one desired one could have c ′ “ shifted ” to a position between a and b . the shift of the current carrying wire will depend on needed application of the stretch hose . in prior art the current carrying wire and the reinforcing wire are adjacent to each other , whereas in the present invention the current carrying wire is located in the angular fold . the key feature of the present invention is not the attaching methods of wires 40 and 50 to electrical stretch hose 10 , but rather the positioning of second wire 50 in relation to helical wire 40 . in the present invention second wire 50 must be placed on the bottom of the fixed side of the fold , this is where large displacements of the flexible cover are not experienced , thus allowing second wire 50 to pass under outer helical wire 40 allowing for a much tighter contraction of the helix and therefore a greater stretch ratio . as various changes could be made in the above constructions without departing from the scope of the invention , it is intended that all matter contained in the above description shall be interpreted as illustrative and not in a limiting sense . in the view above it will be seen that several objects of the invention are achieved and other advantageous results attained .
the present invention is an electrical extensible hose that includes an outer shell , an inner core and at least one helical wire , which acts like a skeleton . in the present invention one implemented an additional wire that was conductive . the outer shell and inner core of the present invention may be bonded together via heat fusion . the helical wire is attached to the inner core via heat fusion . the helical wire supports the outer shell and inner core so as to form a tube . the outer shell and the inner core have a portion that forms an angular fold and have a portion that remains fixed . the second wire is attached at a point below the fixed portion of the electrical stretch hose so as to allow for maximum constriction caused by the shrinkable force created by the helical wire , thus increasing the stretch ratio of the hose .