A Positive-displacement Vehicle Vacuum Cleaner
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FOR the transport industry generally, and for the passenger section in particular, the industrial vacuum cleaner has many applications and notably so in the case of the Centric, a product of Dilworth and Carr, Ltd., Preston. This plant will operate with equal efficiency either in the normal manner or, with the turn of a valve, as a powerful air jet which will force dust or grit from any specially inaccessible places.
In this cleaner a positive-displacement compressor is employed, instead of the centrifugal exhauster which constitutes the more usual system, so that the flow from the collector nozzle to the dust receiver does not need to be
impeded by filters. Filtering takes place in the dust receiver and the clean air that is afterwards expelled becomes a cooling current directed on to the compressor motor.
The compressor is actuated by a threephase high-speed motor to which it is' direct coupled. Being packed with grease, when assembled, the motor bearings do not require subsequent lubrication, whilst the compressor is automatically lubricated from a small auxiliary oil tank. The whole mechanism is enclosed by a sheet-metal cover.
The Centric plant is mounted on a three-wheeled frame of tubular cou. struction and is easily handled, even in places where space is limited.'