US Patent 8112841 Ultraviolet vacuum cleaner with safety mechanism

A combination vacuum cleaner and ultraviolet disinfecting device is presented having a vacuum for cleaning a cleaning medium, such as a carpet, and a UV light source for radiation of the cleaning medium to eradicate the medium of infestation agents such as molds, viruses, bacteria and dust mites. The device provides a multiple of safety switches to prevent power supply to the UV light source under certain conditions. Safety switches are provided requiring a constant activation of a switch by the user on the device handle, activation of contact switches indicating the device is in contact with the cleaning medium, activation of a switch indicating the device is in an in-use position, and a tilt sensor to prevent power supply to the UV light if the device, or a portion thereof, is tilted beyond a preselected degree.