Vacuum cleaner electrostatic build up control system

• US 4,866,565 A
• Filed: 01/13/1989
• Issued: 09/12/1989
• Est. Priority Date: 01/13/1989
• Status: Expired due to Fees

• Current Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Original Assignee: The Kent Company
• Inventors: Wray, Charles C. Jr.
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Brown, Brian W.
• Application Number:
  US07/296,677
• Time in Patent Office: 242 Days
• Field of Search: 361/212, 361/215, 361/220, 174/47, 15/339
• US Class Current: 361/215
• CPC Class Codes: A47L 9/24 Hoses or pipes; Hose or pipe couplings hoses or hose joints in general F16L
• CPC Class Codes: A47L 9/248 Parts, details or accessories of hoses or pipes nozzles A47L9/02
• CPC Class Codes: A47L 9/2857 User input or output elements for control, e.g. buttons, switches or displays
• CPC Class Codes: A47L 9/2889 Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
• CPC Class Codes: H05F 3/02 by means of earthing connections

Abstract

A wire molded into the wall of a vacuum cleaner hose and having electrical conductivity through the vacuum cleaning system by metal to metal conduct and additionally being provided with a grounding cable connected to an external ground bar for dissipating any electrostatic charges built up in the vacuum cleaning system. The vacuum cleaning tools used with the system are at least partially fabricated of static discharging materials in order to further prevent static build-up in the vacuum cleaning system.

Claims

1. A static discharge protected system comprising a vacuum cleaning machine, a vacuum cleaning conductive hose assembly and at least one metal wand connected to said vacuum cleaning machine, said hose being provided with a wire molded in the wall of said hose, an electrically conductive ferrule at opposite ends of said hose assembly being connected to said wire in order to maintain uninterrupted electrical conductivity from said vacuum system to the free end of said metal wand, a tool removably attached to the free end of said metal wand having at least part which is fabricated of a static dissipating material, and a means for separately grounding at least part of said hose assembly.

2. A static discharge protected system as claimed in claim 1 wherein said means for separately grounding is a wire connected at one end to one of said electrically conductive ferrules and is provided with a grounding bar at the other end thereof.

3. A static discharge protected system as claimed in claim 1 wherein said electrically conductive ferrule is metal.

4. A static discharge protected system as claimed in claim 1 wherein said wire molded in the wall of said hose is stranded copper wire.

5. A static discharge protected system comprising a vacuum cleaning machine, a vacuum cleaning conductive hose assembly and at least one metal wand connected to said vacuum cleaning machine, said hose being provided with a wire molded in the wall of said hose, an electrically conductive ferrule at opposite ends of said hose assembly being connected to said wire in order to maintain uninterrupted electrical conductivity from said vacuum system to the free end of said metal wand, a tool removably attached to the free end of said metal wand having a cover which is fabricated of a static dissipating polycarbonate material, and a grounding wire connected to one of said ferrules for grounding at least part of said hose assembly.