Electric resistance heating devices – Heating devices – Convection space heater
Reexamination Certificate
2000-01-20
2001-09-11
Jeffery, John A. (Department: 3742)
Electric resistance heating devices
Heating devices
Convection space heater
C392S378000, C392S373000, C392S365000, C165S130000
Reexamination Certificate
active
06289175
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an independently operating portable radiator.
BACKGROUND OF THE INVENTION
At present, as known, there are several types of independently operating and portable radiators such as radiators wherein circulating diathermal oil is heated by an electric resistance arranged inside the radiator casing.
These diathermal oil radiators usually have a number of radiating members mutually hydraulically connected by means of upper and lower hubs.
Each radiating member is constituted by a first and a second metal plate mutually associated in order to define a central portion wherein the diathermal oil circulates. In each radiating member, the surface portion extending outside the central portion where the oil circulates may have folds and/or channels and/or apertures on the double sheet metal defined by the mutual connection of the first and second plates. Those folds and/or channels and/or apertures tend to reduce the heat transmission from the central portion to the periphery of each radiating member.
In this manner the peripheral surfaces of the radiator are at a lower temperature than that of the heated oil circulating in the central portion. In spite of its good operation, this type of radiator has the inconvenience of being slow and of producing a perceptible convective motion when it is turned on and consequently of being slow at radiating heat to the surroundings. It usually takes in fact at least 7 to 8 minutes to create a convective motion because first the electrical resistance must heat up and then the diathermal oil and the radiating member array. Furthermore, these oil radiators have a relatively high manufacturing cost and accordingly a high retail price.
In fact, the provision of a grid above the radiator casing requires added work of stamping, stocking, degreasing, painting and assembling of the grid thereby increasing costs due to the materials and to the added production steps.
OBJECTS OF THE INVENTION
The aim of the present invention is to eliminate the above cited drawbacks of the prior art radiators operating with diathermal oil.
An important object of the invention is to provide an independently operating portable radiator adapted to generate a convective motion which is perceptible by the user in a very short time and at any rate shorter than that of the conventional radiators.
A further object of the invention is to provide an independently operating and portable radiator allowing to provide the grid directly on the upper portion of the radiating members of the radiator casing in order to eliminate any supplemental manufacturing step and to reduce the manufacturing cost and therefore the retail price of the radiator.
Still a further object of the invention is to provide an independently operating and portable radiator allowing a greater convective motion and therefore a greater thermal exchange, with the same capacity of prior art radiators.
Still a further object of the invention is to provide an independently operating and portable radiator allowing a greater circulation of ambient air and accordingly less time required to heat the ambient, as well as a considerable saving in the raw material needed to manufacture the radiator and therefore a lower weight and an easier handling of the user.
SUMMARY OF THE INVENTION
The above aim, as well as the above and other objects that will be more apparent hereinafter, are achieved by an independently operating portable radiator comprising a body having a plurality of radiating members each defined by at least a first metal plate and a second metal plate mutually associated and by at least one central portion wherein fluid heated by heating means, at a preset temperature circulates, said radiating members being mutually connected through passage hubs for said heated fluid for its circulation inside said body, said radiator further comprising, in at least one region of the surface of the radiating members external to said central portion wherein said heated fluid circulates, additional heating means at least for heating the surrounding air.
REFERENCES:
patent: 1757534 (1930-05-01), Lindstrom et al.
patent: 1840598 (1932-01-01), Murray
patent: 2439945 (1948-04-01), Morton
patent: 2455688 (1948-12-01), Malickson
patent: 5685365 (1997-11-01), De'Longhi
patent: 1032912 (1958-06-01), None
patent: 965801 (1999-12-01), None
patent: 2198609 (1974-05-01), None
patent: 2325000 (1977-05-01), None
patent: 2407437 (1979-06-01), None
patent: 2478277 (1981-09-01), None
De'Longhi S.P.A.
Dubno Herbert
Jeffery John A.
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