Electric heating – Heating devices – With heating unit structure
Patent
1987-06-10
1988-10-18
Goldberg, E. A.
Electric heating
Heating devices
With heating unit structure
219345, 165168, H05B 310
Patent
active
047789794
DESCRIPTION:
BRIEF SUMMARY
The invention refers to an electrical surface heating element having the shape of a panel of electrically insulating material, in particular synthetic plastics material, and having embedded therein heating conductors being connected to supply conductors which enter at least one cavity of the panel, which cavity is open to the edge of the panel and acommodates electrical connecting points of the supply conductors of adjacent panels, this cavity, when seen onto the panel from above, has a constriction in the marginal area of the panel, in which constriction the supply conductors are disposed.
The invention further refers to a process for producing such a surface heating element.
For the purpose of electrically connecting adjacent panelshaped surface heating elements it is known to interconnect the heating conductors of adjacent elements by means of plug connections (German utility model specification No. 8 327 219). This results in the drawback that, on the one hand, the panels must exactly be aligned one relative to the other when installing adjacent panels and that, on the other hand, there is the risk of bare electrically life points remaining within the area of the gap between two adjacent panels. Thus, it has already become known (Austrian patent specification No. 313,432) to provide a recess in the panel edge which recess has, as seen in a top plan view, a rectangular shape, the heating conductors extending into said recess. The recesses of two adjacent panels are located one opposite to other and form a cavity accommodating the connecting points of the heating conductors, this cavity together with the gap between said both panels, being filled up with a sealing compound adhering on the panels. In this manner it is possible to avoid the drawbacks of the previously described known construction, however, the rectangular recesses extending with their longitudinal dimension in parallel relation to the panel edge have the disadvantage of forming a comparatively long interruption of the panel edge, via which humidity may enter the interior of the panel. Furthermore, in general there exists no possibility to install adjacent panels such, that they directly contact one another.
In a further known electrical surface heating element of the kind described (German patent specification No. 878,992) a dove-tail recess is provided in centrally located wooden layers of a panel composed of a plurality of wood layers, the heating conductors extending into this recess. This recess is, however, covered on bottom and on top by the outermost wood layers. Thus, it becomes difficult to make the electrical connection when installing adjacent panels without any gaps therebetween. As soon as the panels have been installed and have been fixed to the supporting base, for example a floor finish, a non-destructive access to the electrical connecting points is not possible.
It is an object of the invention to improve an electrical surface heating element of the initially mentioned type such that installation of adjacent panels is possible in a more versatile manner and, above all, also in direct contact one with the other, or without any gap between two adjacent panels, and that the connecting point is well protected against the access of humidity and, above all, the connecting points are permanently accessible after installation of the panels. In this connection, the construction shall be such that the installed panels can immediately be walked on, without the risk of stumbling due to any uneveness of the surface of the installed panels. According to the invention, this task is--based on an electrical surface heating element of the initially described type--solved by the fact that the cavity extends upwardly up to the top surface of the panel also within the area of the constriction and is closed to above by a filling compound and/or at least one removable cover extending to the panel edge and covering the connecting point, the top surface of the filling compound or of the cover smoothly adjoining the top surface of the adjacent pan
REFERENCES:
patent: 2521540 (1950-09-01), Richardson
patent: 3400247 (1968-09-01), Deacon
patent: 3935422 (1976-01-01), Barnes et al.
patent: 4438325 (1984-03-01), Gellert
Windisch Josef G.
Windisch Sigrid
Goldberg E. A.
Lateef M. M.
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