[0001] The present invention relates to a steam ironing apparatus comprising an ironing
board provided with a plurality of through holes distributed on its surface, a chamber
whereinto said through holes open inferiorly associated to said ironing board, fluid
dynamic means able selectively to generate a positive pressure and a negative pressure
within said chamber.
[0002] As is well known, in some steam ironing apparatuses, whether steam is produced by
a boiler integrated within the iron, or obtained by means of independent boilers,
to improve the results of the ironing operation ironing boards are adopted that are
provided with a plurality of through holes distributed throughout the surface and
ending in a chamber inferiorly associated to the ironing board itself. Appropriate
fluid dynamic means allow to generate selectively a positive pressure, i.e. an over-pressure
with respect to atmospheric pressure, or a negative pressure, i.e. a vacuum also with
respect to atmospheric pressure, in said chamber so that the through holes serve the
functions respectively of blowing air upwards or of taking in air mixed with steam.
[0003] The first function allows, especially in the case of clothing articles made of thin
and light fabric, to inflate and lay the fabric down on the ironing board preventing
the formation of spurious creases. The second function facilitates the passage of
steam through the fabric of the article to be ironed, reduces its drying time and
improves its stability and adherence to the plane of the ironing board.
[0004] In a device realised in accordance with the prior art, especially widespread in professional
systems, the fluid dynamic means that generate, in the aforementioned chamber, the
positive pressure, i.e. the emission of air from the through holes, and the negative
pressure, i.e. the intake of air and steam through the holes, generally comprise two
independent ventilators which can be selectively started, each being exclusively dedicated
to the specific function of blowing or drawing a suction. Each ventilator is placed
in communication with the chamber underlying the ironing board through its own conduit.
In this technical solution it is necessary for each of such conduits to be provided
with a movable shutter closure gate, usually able to be actuated manually be electromechanical
devices so that, when a fan is operating, the passage of the conduit of the other
fan is occluded and vice versa, to prevent the specific blowing or suction action
of each fan from being ineffective.
[0005] The technique described above, although it is effective in reaching an improvement
of the ironing operation, is nonetheless costly and complex and hence also not economical
for applications in home systems, especially for the necessary presence, in the two
flow conduits of the fans, of the movable gates and of the mechanisms controlling
their operation.
[0006] In the attempt to overcome the aforementioned drawback a second known technique,
described in European patent application EP 0750066 A1, provides for the replacement
of the two independent ventilators with a single axial flow ventilator controlled
by electronic means which allow to select the direction of rotation according to whether
a positive pressure or a negative pressure is to be exerted. However, this second
solution too, while it does eliminate the movable gates and the related actuation
mechanisms, thereby indeed reducing the complexity and manufacturing and maintenance
costs of the first known technique, is not yet fully optimal both from the standpoint
of lowering manufacturing costs and of the overall reliability of the apparatus, since
the additional electronic circuitry, to control the direction of rotation of the fan,
constitutes, especially for a home apparatus, a delicate part, subject as it is to
its own statistical rate of possible failures, and one with relatively high cost.
[0007] In this situation the general aim of the present invention is to devise a steam ironing
apparatus that is able substantially to overcome the aforementioned drawbacks. The
object of the present invention is to devise a steam ironing apparatus that, in addition
to maintaining the effectiveness of the known techniques based on the selective generation
of blowing and intake flows on an ironing board, allows to contain to a minimum level
the addition of specific mechanisms and components and thus presents the utmost constructive
simplicity and a very low manufacturing cost.
[0008] The specified aims are substantially attained by a steam ironing apparatus that is
characterised in that said fluid dynamic means comprise a pair of independent ventilators,
a first ventilator able to generate the positive pressure and a second ventilator
able to generate the negative pressure, presenting the respective fans positioned
in a single conduit in communication with said chamber.
[0009] The description shall now be provided, purely by way of indicative example, of a
preferred embodiment of a steam ironing apparatus according to the invention, illustrated
in the accompanying drawings, wherein:
- Figure 1 shows a longitudinal section view of an ironing apparatus according to the
invention;
- Figure 2 shows a section according to plane (II-II) of Figure 1.
[0010] With reference to the aforementioned figures, the steam ironing apparatus is globally
indicated with the number 1. It comprises an ironing board 2 provided with a plurality
of through holes 3 distributed on its upper surface and a chamber 4 whereinto said
through holes open, formed by an appropriately shaped wall and inferiorly associated
to the ironing board itself.
[0011] To chamber 4 are connected fluid dynamic means 5 able selectively to generate therein
a positive pressure so that small air flows exit from the through holes 3 and a negative
pressure whereby the same through holes 3 draw a suction.
[0012] The fluid dynamic means 5 are defined by a pair of independent axial ventilators,
i.e. a first ventilator 6 to generate, for instance, said positive pressure and a
second ventilator 7 to realise said negative pressure, both situated, originally,
in a single conduit 8 in communication with the chamber 4 in such a way that the respective
fans 6a and 7a present their axes 6b and 7b aligned in said conduit.
[0013] In practice the latter is travelled through by a flow of air directed towards the
chamber 4 and thus towards the through holes 3 when the first ventilator 6 is operated,
or by a flow in the opposite direction when the second ventilator 7 is operated, thereby
creating a vacuum in the chamber 4.
[0014] The conduit 8 presents towards the exterior a mouth closed by a protective grid 9
which is traversed by a flow of air travelling in one or the other direction depending
on the ventilator in operation.
[0015] Advantageously the first and the second ventilator 6 and 7 are identical, positioned
specularly opposite, and are sustained by a respective support 10, in the conduit
8, so that the corresponding fans 6a and 7a present rotatory motions oriented in opposite
directions. The supports 10 are formed by a plurality of radial elements 10a which
render optimal the passage of the flow of air through the fans.
[0016] The first ventilator 6 which realises the positive pressure in the chamber 4, shown
(Figure 1) in a position above the second ventilator 7, which instead generates the
vacuum, can be exchanged therewith with no change in the effectiveness of the operation
of the apparatus.
[0017] Preferably the ventilator motors are connected in such a way as to be interposed
between the fans 6a and 7a thereby maximising the distance therebetween and minimising
the fluid dynamic interference that the fan of the inactive ventilator could cause
on the fan of the operating ventilator.
[0018] It is obviously possible to conceive other technical solutions similar to the one
described above that allow to obtain air flows in opposite direction from two independent
ventilators located in the same conduit.
[0019] For instance, the two ventilators could be arranged in series in the conduit if their
motors rotate in opposite directions. Or, still positioning the two ventilators in
successions, the ventilators have motors that rotate in the same direction and their
fans are mounted mutually opposite, thereby obtaining air flows that travel in opposite
directions.
[0020] The invention attains important advantages.
[0021] The apparatus according thereto presents simple constructive solutions, with limited
cost.
[0022] It should be stressed first of all that movable gates and related actuating means
are unnecessary since the single conduit wherein the two ventilators of the apparatus
are located must always be in communication with the exterior regardless of the ventilator
in operation.
[0023] Moreover, the ventilators can be commanded from very simple control devices, since
only the start or stop of each ventilator is required, but not the reversal of their
motion.
[0024] In practice the constructive simplicity of the apparatus allows to obtain, in addition
to low manufacturing costs, a very high overall operational reliability.
1. Steam ironing apparatus comprising:
- an ironing board provided with a plurality of through holes distributed on its surface,
- a chamber whereinto said through holes open, inferiorly associated to said ironing
board,
- the fluid dynamic means able selectively to generate a positive pressure and a negative
pressure in said chamber,
characterised in that said fluid dynamic means comprise a pair of independent ventilators,
a first ventilator able to generate positive pressure and a second ventilator able
to generate negative pressure, presenting the respective fans positioned in a single
conduit in communication with said chamber.
2. Apparatus according to claim 1, characterised in that said first ventilator and said
second ventilator are mutually identical and positioned specularly opposite in said
conduit in such a way that the respective fans generate flows oriented in opposite
directions.
3. Apparatus according to claim 1, characterised in that said first ventilator and said
second ventilator are arranged in series in said conduit and present motors rotating
in opposite directions.
4. Apparatus according to claim 1, characterised in that said first ventilator and said
second ventilator are arranged in series in said conduit and present motors rotating
in the same direction and fans with blades mounted mutually opposite able to generate
flows travelling in opposite directions.