Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1985-05-28
1986-12-16
Goldberg, E. A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219549, H05B 336
Patent
active
046298681
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heating pad, particularly for vehicle seats, where at least one electrically insulated heating wire is laid in loops between a first covering layer and an intermediate layer joined to the first layer and united with a second covering layer on its opposite side. The invention also relates to a method of producing and using such a heating pad.
In the use of heating pads of this type for vehicle seats, there is a great risk of the heating pad being damaged, e.g. by sharp objects which penetrate into it and possibly spoil the heating wire. To reduce such risks, the heating wire is often placed under several protecting covering layers included in the pad. Furthermore, the pad has often been placed under one or more layers united with the seat covering, with deteriorated heat exchange as a result. Difficulties have also been encountered in locating the pad relative the seat covering, which is something essential to ensuring good function during a long period.
The object of the present invention is to provide an improved heating pad, which is more resistant to damage than previous heating pads and which permits simple fitting for improved heat exchange. A further object is to provide a heating pad which is simple to manufacture.
This is achieved in accordance with the invention in that the thickness of the intermediate layer is greater than the diameter of the heating wire, preferably at least twice as great as the diameter of the wire; in that the intermediate layer is of soft material, preferably foamed plastics, its elasticity being such that the wire is kept resiliently pressed so far into the intermediate layer by the first covering layer that the latter is given a smooth appearance without protuberances from the heating wire, the intermediate layer forming an elastic support for the heating wire; and in that the wire has a hard insulation, preferably of polytetrafluoroethane, enabling the wire to be moved to one side without being damaged by a sharp object penetrating the heating pad, e.g. a needle. In such a pad, either or both the covering layers preferably consist of woven material. The heating wire can suitably be made up from several strands.
A heating pad of this type can to advantage be applied directly to the inside of the covering of a vehicle seat and fixed to the covering with the aid of through seams without damaging the heating wire. There is thus obtained good location of the heating pad, simultaneously as improved heat exchange is obtained.
Further aspects of the invention will be apparent from the following description and claims.
The invention will now be described in more detail in the following with the aid of an embodiment illustrated on the accompanying drawing, whereon
FIG. 1 is a perspective view, partially in section, of a heating pad in accordance with the invention,
FIG. 2 is a partial section through the heating pad in FIG. 1,
FIG. 3 is a section through a heating wire, to an enlarged scale,
FIG. 4 schematically illustrates how a heating pad in accordance with the invention is sewn directly to the covering of a vehicle seat, and
FIG. 5 schematically illustrates an inventive heating pad during manufacture.
As will be seen from FIG. 1, there is an electrically insulated heating wire 2 in an inventive heating pad 1, the wire being laid in loops between a first covering layer 3 and an intermediate layer 4 joined thereto, the intermediate layer being joined to a second covering layer 5 on its opposite side. The heating wire 2 is provided with connections 6 and 7 for connection to a voltage supply.
As will be more closely apparent from FIG. 2, the intermediate layer 4 has a thickness a, which is greater than the diameter d of the heating wire. It has been found suitable for the thickness a to be at least twice as great as the diameter d. By making the intermediate layer 4 of soft material with a suitable elasticity, it will be possible to keep the heating wire 2 pressed into the intermediate layer 4 with the aid of the covering layer 3 such that the la
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Autopart Sweden AB
Goldberg E. A.
Walberg Teresa J.
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