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Title: Hose having an electrically conductive layer for dissipating static electricity and method of making same
Claims: What is claimed is: 1. A hose construction having means for dissipating static electricity and comprising, a polymeric inner tubular layer, a braided layer disposed against said inner tubular layer and comprised of a plurality of filaments, and an electrically conductive layer made of carbonaceous particles overlying said braided layer and including carbonaceous particles dispersed between said filaments, said particles being disposed in overlapped relation in layer form enabling relative movement therebetween while maintaining electrical continuity to enable dissipating said static electricity. 2. A hose construction as set forth in claim 1 in which said carbonaceous particles are within the range of 4 to 10 microns in size. 3. A hose construction as set forth in claim 2 in which said carbonaceous particles are particles of carbon black. 4. A hose construction having means for dissipating static electricity and comprising, a polymeric inner tubular layer, a first braided layer disposed against said inner tubular layer and comprised of a first set of filaments, a second braided layer disposed around said first braided layer and comprised of a second set of filaments, and an electrically conductive layer made of carbonaceous particles disposed between said braided layers and betwen the filaments of each of said braided layers, said particles being disposed in overlapped relation in layer form enabling relative movement therebetween during flexing movement of said hose construction yet maintaining electrical continuity to enable dissipation of said static electricity. 5. A hose construction as set forth in claim 4 in which said electrically conductive layer is made of said carbonaceous particles having a size ranging between 4 and 10 microns. 6. A hose construction as set forth in claim 5 in which said inner tubular layer is made of a seamless synthetic plastic material and said braided layers are made of synthetic plastic material. 7. A hose construction as set forth in claim 5 and further comprising a protective cover disposed around said second braided layer. 8. A hose construction as set forth in claim 7 in which said protective cover is in the form of a synthetic plastic cover. 9. A hose construction as set forth in claim 4 in which said electrically conductive layer is made of said carbonaceous particles in the form of carbon black having a size such that 90% thereof are below 7 microns in size. 10. A hose construction as set forth in claim 4 in which said inner tubular layer is made of nylon, said braided layers are made of nylon, and further comprising a protective cover for said hose construction made of a polymeric material, said cover being disposed around said second braided layer. 11. A hose construction as set forth in claim 10 in which said protective cover is made of polyurethane. 12. A method of making a flexible hose construction for dissipating static electricity built up thereon, said method comprising the steps of, providing a polymeric inner tube, braiding a first braided layer against said tube, placing the tube with the first braided layer thereon in contact with a dispersion containing carbonaceous particles disposed therethrough causing said carbonaceous particles to form an electrically conductive layer around said first braided layer and between filaments comprising said first braided layer, braiding a second braided layer around the electrically conductive layer to sandwich the electrically conductive layer between said first and second braided layers, and drying the hose construction. 13. A method as set forth in claim 12 in which said drying step comprises drying said hose construction in a heat tunnel. 14. A method as set forth in claim 12 and comprising the further step of disposing a protective cover around said second braided layer. 15. A method as set forth in claim 14 in which said disposing step comprises extruding a cover made of a polymeric material concentrically around and against said second braided layer. 16. A method as set forth in claim 15 and comprising the further step of air cooling said hose construction to cool said extruded cover. 17. A method as set forth in claim 12 in which said placing step comprises passing the tube with the first braided layer thereon through an aqueous bath which defines said dispersion and is comprised of between 15 and 50 parts by weight of carbonaceous particles, 2 parts by weight of sulfonated surfactant, 0.2 parts by weight of potassium hydroxide, and the balance of 100 parts by weight being water. 18. A method as set forth in claim 17 and comprising the preparation step of forming said dispersion using a ball mill to disperse said carbonaceous particles. 19. A method as set forth in claim 12 in which said placing step comprises spraying the tube with the first braided layer thereon with said dispersion. 20. A method as set forth in claim 12 in which said placing step comprises placing the tube with the first braided layer thereon in contact with a dispersion containing particles of carbon black. Other info: Inventors: Phillips, Alfred R. (Waynesville, NC, US) Logan, Arthur D. (Waynesville, NC, US) Application Number: 719873 Filing Date: 1976-09-01 Publication_date: 1977-11-22 Assignee: Dayco Corporation (Dayton, OH) Primary Class(es): 361/215 138/103, 138/125, 138/177, 156/143, 156/149, 174/47 Other Classes: US Patent Ref:
Other Refs:
Primary Examiner: Askin, Laramie E. Assistant Examiner: Attorney: Wolk; Reuben |
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