Electric resistance heating devices – Heating devices – Convection space heater
Reexamination Certificate
1999-05-13
2001-07-17
Jeffery, John A. (Department: 3742)
Electric resistance heating devices
Heating devices
Convection space heater
C392S373000, C392S347000, C165S130000
Reexamination Certificate
active
06263157
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an independently operating and mobile radiator and to a process for manufacturing the radiator.
2. Description of the Prior Art
At present, as known, there are several types of independently operating and mobile 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 metal plate 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 are adapted 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 a relatively high manufacturing cost and accordingly a high retail cost.
In fact, the provision of a grid above the radiator casing requires added workings of forming, storing, degreasing, painting and assembling of the grid thereby increasing costs due to the materials and to the added production steps.
OBJECTS OF THE INVENTION
Moreover, the above described prior art radiators have the inconvenience of being heavy which entails high shipping costs and is a hindrance for the end user when moving the radiator around the room.
The aim of the present invention is to eliminate the above inconveniences of the prior art radiators operating with diathermal oil.
An important object of the invention is to provide an independently operating and mobile radiator and a process for its manufacturing allowing a considerable saving of material for the manufacture of the radiator and thereby a lower weight of the radiator and easier handling by the user.
A further object of the invention is to provide an independently operating and mobile radiator and a process for its manufacture allowing the grid to be located directly on the upper portion of the radiating members of the radiator casing in order to eliminate any supplemental manufacture step and to reduce the manufacturing cost and therefore the retail cost of the radiator.
Still a further object of the invention is to provide an independently operating and mobile radiator and a process for its manufacturing 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 mobile radiator and a process for its manufacturing allowing a greater circulation of ambient air and accordingly less time required to heat the room and a better overall efficiency of the radiator.
SUMMARY OF THE INVENTION
The above technical aim, as well as the above and other objects that will be more apparent hereinafter, are achieved by an independently operating and mobile radiator comprising heating means. The radiating members are mutually by at least a first metal plate and a second metal plate mutually associated and by at least one central portion wherein heated fluid circulates at a temperature preset by heating means, said radiating members being mutually connected through passage hubs for the heated fluid for its circulation inside the body. Each of the radiating members has at least one region of its surface, external to the central portion wherein the heated fluid circulates, having a wall thickness substantially equal to the thickness of said first metal plate and of said second metal plate.
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De'Longhi S.P.A.
Dubno Herbert
Jeffery John A.
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