Anchorage system for a heating wire or tape on insulating blades or supports in electrical resistors for toasters, ironing equipment and the like

Abstract

 A system for anchoring a heating wire or tape on insulating blades or supports of electrical resistors, which does not require the blade to be serrated, but only simple holes to be provided into which the omega-shaped wire or tape is inserted in order to hold it inside the hole without additional means of anchorage, allowing the wire to be made to follow any desired path on the insulating blade or support.

Description

[0001] The invention refers to an anchorage system of the heating wire or tape on insulating blades or supports, in electrical resistors for toasters, ironing equipment and similar electrical household appliances.

[0002] Electrical resistors for toasters and the like are commonly constituted by a heating wire or tape anchored to a blade or support of insulating material such as micanite, continuous mica and so on. The current anchorage system consists of hooking the flattened heating wire or tape onto the lateral serration of the blade. This however requires the blades to be serrated and then the wire to be hooked to said serration, operations which are inconvenient and not easy to automate.

[0003] The system of anchorage of flattened wire or tape according to the present invention eliminates these disadvantages and resolves these problems and does not require serration of the blade, but only simple holes into which the tape or wire are inserted by means of suitable punches, imparting an omega-shape to the wire or tape which thus remains fixed by a snapping action into the holes.

[0004] As will be immediately evident to a person expert in the art, the anchorage system according to this invention has numerous advantages, the main ones being the following:

• Simplicity of execution, given that the holes in the blade and the insertion of the wire or tape with shaped punch are simple operations and easily automated;
• The fact that the wire or tape may be made to follow any path over the whole area of the blade of mica or similar isolating material, thanks to the omega shaping, which also permits the direction of the path to be changed at every anchorage hole;
• The fact that the heating can be distributed or concentrated in any desired part of the insulating structure, so as to obtain a uniform effect, for example uniform toasting of a piece of bread, so difficult to obtain with current resistors.

[0005] These and other advantages, characteristics and objects of the system according to this invention are even clearer and more evident from the following detailed description of a form of embodiment, given only as an example with reference to the figures of the appended sheets of drawings, in which:

Figure 1 is a perspective view of a portion of the insulating blade and heating tape anchored to it.

Figure 2 is a sectional view of the said elements of Figure 1; and

Figure 3 is a plan view of an example of a resistor for a toaster, carried out according to the principles of this invention, and which allows the concentration of the heating tape in the various areas of the isolating blade to be varied.

[0006] First making reference to figures 1 and 2 of the appended drawings, one may clearly see that simple holes 2 are provided on the blade 1 made of mica or similar insulating material , a heating tape 3 is inserted into said holes by means of a suitable shaped punch, said tape thus assuming shaping 4 in the form of an omega in correspondence with the holes, said shaping holding it securely anchored to blade 1.

[0007] This anchorage system allows the direction of the path of the tape to be changed at each anchorage point, and also to distribute or concentrate the heating in any desired part of the insulating support.

[0008] As one can see as an example in Figure 3, in an electrical resistor for a toaster,on the insulating support blade 5 the heating tape 6, anchored in holes 7, has a greater concentration in the lower part of the blade in order to obtain uniform toasting of a slice of bread.

[0009] From the previous detailed description one can thus understand that the system of this invention fully achieves the prefixed objects, but the fact must be pointed out that various additions, modifications, and/or substitutions of parts may be brought to this, while remaining both within its spirit and its object and remaining within its scope of protection, as is also shown in the appended claims.

Claims

1. Anchorage system of the heating wire or tape on the insulating blades or supports, in electrical resistors for toasters, ironing equipment and the like, characterised in that it is constituted by omega-shaped lengths of wire or tape, inserted in simple holes made at the desired point on the insulating blade or support.

2. Anchorage system according to claim 1, characterised in that the omega shaping is imparted to the wire or tape by means of suitable punches having the desired shaping.

3. Anchorage system according to claim 1, characterised in that the omega shaping imparted to the wire or tape allows the heating wire or tape to follow any path over the whole area of the insulating blade or support, allowing the direction of the path to be changed at every anchorage hole.

4. Anchorage system according to claim 3, characterized in that the possibility for the heating wire or tape to take any path over the whole area of the insulating blade or support also allows the heating to be distributed or concentrated in any desired part of the insulating blade or support.

5. Anchorage system of the heating wire or tape on the insulating blades or supports, in electrical resistors for toasters, ironing equipment and the like, substantially as described above and as shown in the appended sheets of illustrative drawings, for the above specified objects.

Drawing