| 摘要 |
A dry foaming coin operated carpet and upholstery cleaning machine for a car washes. A rigid, generally box-like cabinet is secured in a convenient user accessible position. An elongated hose extending from the housing terminates in a user-activated brush which outputs foam and facilitates vigorous cleaning. The control circuit comprises a conventional coin mechanism which operates a timer to initiate a vend. The timer first activates an air compressor, which supplies high pressure air to the system. A remote user switch associated with the brush must be activated to thereafter activate a pump to supply cleaning solution, and to close an air solenoid for air mixing. Simultaneously a heater is activated to heat the control block disposed within the brush. A brush control block properly mixes air and cleaning solution. An elongated heater compartment preheats incoming air, which is thereafter mixed with cleaning solution and discharged through a foam generating chamber in the block. A velocity increasing orifice intercommunicates the mixing chamber with the foam generating chamber, and dry foaming is further enhanced with a sponge-like packing insert disposed within the generating chamber. Spraying is avoided to prevent dampness.
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