Grounding system for a heated hose
A sturdy electrical power circuit and grounding circuit for an electrically-heated hose is formed by electrically connecting a grounding wire extending along the length of the hose to a pair of fluid couplings fitted on opposite ends of the hose. The grounding wire is mechanically clamped against the inner wall of the hose by radially-outwardly expanding a tube on each coupling against the grounding wire to secure the grounding wire in place while simultaneously forming an electrical connection between the grounding wire and the fluid couplings.
1. A heated hose assembly, comprising:
a flexible hose body having an inner wall, an outer wall, a first end portion and a second end portion;
a first and a second heating wires each extending longitudinally and parallel to an axis of said hose body and within the inner wall;
a hose ground wire extending longitudinally and parallel to the axis of said hose body and within the inner wall, said hose ground wire having first and second end portions;
a first fluid coupling provided on said first end portion of said flexible hose body, the first fluid coupling comprising a stem inserted into said first end portion of said flexible hose body and radially clamping said first end portion of said hose ground wire against an inner surface of said inner wall of said flexible hose body, such that a contact between the first fluid coupling and the first end portion of the hose ground wire grounds the hose ground wire; and
a power cord electrically connected to said first and second heating wires and to said hose ground wire.
2. The assembly of claim 1 , further comprising a second fluid coupling provided on said second end portion of said flexible hose body, the second fluid coupling comprising a stem inserted into said second end portion of said flexible hose body and radially clamping said second end portion of said hose ground wire against said inner wall of said flexible hose body.
3. The assembly claim 2 , wherein said power cord comprises a power cord hot wire, a power cord neutral wire and a power cord ground wire, and wherein said power cord ground wire is electrically connected to said hose ground wire and clamped against said inner wall of said flexible hose body by said second fluid coupling.
4. The assembly of claim 3 , further comprising a first ring fitted over said first end portion of said flexible hose body and over said outer wall, said first end portion of said flexible hose body radially clamped between said stem of said first fluid coupling and said first ring.
5. The assembly of claim 4 , wherein said first ring is formed with a first axial notch and wherein said first heating wire is aligned within said first axial notch.
6. The assembly of claim 4 , wherein said first ring is formed with a first axial notch and a second axial notch, and wherein said first heating wire is aligned within said first axial notch, and said second heating wire is aligned within said second axial notch.
7. The assembly of claim 6 , further comprising a thermostat connected to said first and second heating wires.
8. The assembly of claim 7 , further comprising a sleeve comprising an electrically-insulating material tightly fitted over said first and second heating wires and said thermostat.
9. The assembly of claim 4 , further comprising a second ring fitted over said second end portion of said flexible hose body and over said outer wall, said second ring formed with a second ring axial notch and wherein said power cord ground wire is aligned within said second ring axial notch.
10. The assembly of claim 9 , wherein said stem provided on said second fluid coupling is radially-outwardly plastically deformed so as to clamp said second end portion of said flexible hose body against said second ring.
11. The assembly of claim 10 , further comprising a thermostat electrically connected to said first end portions of said first and second heating wires and wherein said cover covers said thermostat.
12. The assembly of claim 11 , wherein said ring is formed with notches and wherein said first heating wire is aligned in one of said notches.
13. The assembly of claim 12 , further comprising a threaded fluid coupling coupled to said tube.
14. A heated hose assembly comprising:
a flexible hose body having an inner wall, an outer wall and an internal flow path;
a first and a second heating wires each extending longitudinally and parallel to an axis of said hose body and within the inner wall, each heating wire having opposed free end portions;
an electrical ground wire extending longitudinally and parallel to the axis of said hose body and within the inner wall, the electrical ground wire having first and second opposed free end portions;
a tube inserted into said internal flow path and clamping said first free end portion of said ground wire against said inner wall, such that a contact between the tube and the first free end portion of the ground wire grounds the ground wire;
a ring provided on said outer wall and surrounding said tube;
a protective sheath surrounding said ring and covering said first end portions of said first and second heating wires, respectively; and
a power cord connected to said first and second heating wires and said ground wire.