This invention deals with a seating apparatus for chairs, for instance, wheelchairs destined for invalids.

Concerning the use of the wheelchairs destined to invalids, different types of cushions are already known designed to limit as much as possible the occurrence of bedsores or lesions from long hospitalization. Such cushions are made in a particular conformation with pointed cells, filled with air by means of a manual pump, so as to create a suitable floating support for a subject who must spend a great deal of time in a wheelchair.

However, such cushions present a series of problems for those people who use them since the cells, in the zones of greatest pressure, have a tendency to bend toward the inside limiting the passage of air between the cushion and the parts of the body in contact with the same and, therefore, they bring about the forming of lesions.

Furthermore, the cushion can easily break and, being made up of just one air pocket, may deflate making itself unusable unless suitably repaired.

This invention proposes a seating cushion that is able to resolve the above mentioned drawbacks and to allow people who are seated to spend a great deal of time in such position with no bothers and, above all, without causing any lesions (for instance, bedsores).

What is more, the cushion can easily be removed and/or moved at any time and for any reason, for instance for maintenance or cleaning.

The subject of this invention is made up of a seating apparatus with circulation of ionized air having the features of claim 1. Said apparatus allows an easy and effective circulation of air between its points of contact and the body of the subject who is seated and, through the production of negative ions, it opposes the onset of infections from pathogenic germs that can multiply themselves in an exponential way when the skin is overheated, moist and compressed.

The invention is further clarified through illustration of the exemplary solution in the attached drawings, in which:

Fig. 1 illustrates the frontal view of the seating apparatus subject of this invention;

Fig. 2 illustrates the side view of the apparatus of Figure 1 ;

Fig. 3 illustrates the view from above of the apparatus of Figure 1 ;

Figure 4 illustrates the exploded view of the apparatus of Figure 1.

With reference to the figures mentioned, the apparatus being dealt with is made up of a rigid housing box 1 fitted with top closure 2 with holes 21, destined to the support of a cushion 3, including springs 4, padding 5 and breathable element 6.

The rigid housing box 1 also includes means of support and coupling 10 to the chair.

Furthermore, the cushion 3 is fitted with sensors of pressure, temperature and moisture.

In a preferable solution, the housing box 1 and closure top and support 2 are made from a plastic material (ABS or PVC) and/or other thermo-formable and resistant material. Inside said housing box, there are the electronic components destined to the production of ionized air: a low-noise primary fan 1 1 placed at the bottom of said housing 1 , secondary fans 12, placed at the back part of said housing box 1 , rechargeable battery power 14, one or more ion generators 15, an electronic control card 16 of the on/off state of the system, the rotation speed of the fans, the ion generator and the auxiliary connections and, finally, one or more deflectors of the flow of negative ions with a system to capture positive ions. In the side part of the housing box 1 an on/off switch, a regulator of the intensity of air flow of the fans and a socket for the power supply, for instance, low voltage to recharge the batteries are all envisaged.

In the part below said housing box, the coupling means 10 are envisaged that are adjustable so as to easily adapt to any type of chair.

The bottom of said housing box 1 has a hole 20 for the intake of air from the outside in correspondence with the primary fan 1 1 , while another hole 20' is in correspondence with the secondary fans 12.

As already indicated above, the closure top and support 2 has a hole not only to reduce the weight of the apparatus but also to allow the passage of ionized air produced by the generator with the aid of the fans, which is projected inside the cushion and, therefore, to the base of the seat.

What is more there is conveniently created, on this support 2, an extruded edge 18 turned upward so as to encourage the flow of air, to prevent the entry of liquid substances inside the system and to supply a system of centring for the interior sprung cushion. Said interior sprung cushion 3, already in itself known on the market, is fitted with a particular padding 5 able to improve the user's comfort without hampering the flow of air coming from below. For this reason, the use of an open-cell non-woven fabric is envisaged with considerable capacity of breathability, lightness and softness. The external covering is, instead, made with an open-weave fabric with good resistance. A fabric with breathable membrane, for instance "Gore-Tex ®", may also be conveniently used.

In the part below said covering, as described above, pressure, temperature and moisture sensors can be positioned able to allow an automatic regulation of the ventilation system.

Indeed, on the electronic control card 16 the possibility of inserting a speed regulator for the fans is envisaged which can increase or decrease the flow of air produced by the fans themselves.

The electronic card is therefore fitted with input terminals for the signals produced by the of pressure, temperature, and moisture sensors, able to manage the starting and stopping of the fans and the ion generator according to the pre-set values.

This results particularly useful in the cases in which the subject that is seated has lost (for instance after having suffered a bone marrow lesion) the sensitivity to touch and temperature, in that the system operates automatically: the system activates when a subject sits on the cushion, the fans and the ion generator work in relation to the pre-set values and it is deactivated when it notices the absence of weight on the cushion (the subject gets up from the seat). Again it is possible to manage the operation of the fans and the ion generator by means of a remote control with, or without wires.

Additionally or alternatively, the apparatus described herein can also be used for seatback cushions.