Electric resistance heating devices – Heating devices – Vaporizer
Reexamination Certificate
2000-05-26
2001-08-14
Walberg, Teresa (Department: 3742)
Electric resistance heating devices
Heating devices
Vaporizer
C392S494000
Reexamination Certificate
active
06275653
ABSTRACT:
This invention relates to small appliances for domestic use provided with a steam generator.
In particular the invention relates to steam cleaning appliances for domestic use, and specifically the steam generator, or boiler, with which they are provided.
Steam cleaning appliances of known type consist of an outer casing, generally shaped as a gun or at least provided with a gripping appendix, within which a pump is provided to draw water from a water container rigid with said casing, and to feed it to a small steam generator positioned downstream of the pump and connected to a delivery nozzle.
One of these appliances is fully described in utility model application No. RE94U000017 in the name of the present applicant.
Small steam generators must be fed with treated demineralized water to prevent the salts present in the water from clogging the device by depositing in the form of limestone on the inner walls of the generator.
Alternatively, to use untreated water the appliances must be provided with special means for reducing calcareous deposition on the inner walls of the generator. Both chemical means and electrically operated means are known for this purpose, the former consisting of ion exchange resin filters, and the latter comprising permanent magnets or coils positioned downstream of the water intake pump to generate an electrical field tending to orientate the salts contained in the water and in this manner limit their deposition on the inner walls of the steam generator.
The known means have proved inadequate in terms both of cost and efficiency, in particular because the ion exchange resin filters re not only of high unit cost, but have to be replaced with a certain frequency.
The object of the invention is to overcome the aforestated drawback within the context of a rational and reliable solution of particularly low cost.
The invention attains said object by virtue of a steam cleaning appliance for domestic use provided with means of mechanical type for removing calcareous deposits from the inner walls of the steam generator during or immediately after their formation.
In a first embodiment of the invention, there is provided inside the vaporization chamber a member which, when operated, rubs against the inner walls of the vaporization chamber to remove the deposits present on it.
Said member can be operated occasionally by the operator, to provide an action by which the calcareous deposits already formed during the use of the appliance are removed.
Said member can also be operated automatically by suitable means when the appliance is switched on, in which case there is continuous action preventing the formation of calcareous deposits.
Said member can be of various shapes, but in cross-section must have at least one portion in contact with the boiler inner walls so that when operated, it rubs against the walls of the vaporization chamber.
In a second embodiment of the invention, said member is not positioned permanently inside the vaporization chamber, but lies outside it, housed in a suitable seat in the appliance.
In this case the appliance is formed in such a manner as to enable the user to easily gain access to the vaporization chamber, to enable the deposits formed during use to be removed by said member.
REFERENCES:
patent: 1940506 (1933-12-01), Peck
patent: 2530799 (1950-11-01), Arvintz et al.
patent: 3968346 (1976-07-01), Cooksley
patent: 4065057 (1977-12-01), Durmann
patent: 4479484 (1984-10-01), Davis
patent: 5784531 (1998-07-01), Mann et al.
patent: 6031969 (2000-02-01), Burr et al.
patent: 6148144 (2000-11-01), Milanese
patent: 2345921 (2000-07-01), None
patent: RE9400017 U (1995-09-01), None
patent: 20005104 (2000-11-01), None
Birch & Stewart Kolasch & Birch, LLP
Fastovsky Leonid
General Technology S.R.L.
Walberg Teresa
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