BLOWER STRUCTURE

A blower structure constituted by a rotating head composed of a protective annular band which is provided with a blunt circumferential outer flap and is connected, by way of two or more blades, to a support, the latter being constituted by a flat base from which a propeller cuff protrudes below, it being possible to key the flat base onto a motorized head of a brush cutter, each one of the blades having a shape structure that is adapted to obtain an air flow oriented toward an axis of the flat base in a direction of the propeller cuff.

The present invention relates to a blower structure.

Nowadays blowers are known which are comprised of a box-like main body, usually made of plastic material, in which an electric or gasoline motor is accommodated and with which a handle is associated; there is a switch for switching on/off, and a lever for controlling the speed, while the main body is connected to a tube for dispensing air.

A fan is usually keyed to the shaft of the engine and is provided with radial blades, the function of which is to frontally suck air in order to then convey it radially to the tube.

Such blowers are therefore used for example to blow leaves in a desired direction in order to later collect them more easily in a desired area.

Such conventional solution suffers drawbacks, however: the air output from the tube generates a flow that has a substantially conical orientation with a lateral component that determines a dispersion of the product that the user wants to direct, which is therefore dispersed further, requiring further passes with the blower in order to redirect it toward the desired area, and therefore more time to carry out the work.

These lateral dispersions of the air flows further entail an expenditure of energy, thus entailing a higher consumption of fuel.

Furthermore such conventional blowers have a high purchase cost.

Such conventional blowers are further particularly heavy and must be firmly gripped and supported with one hand only by way of the handle, and therefore it is not very easy to orientate them.

In such conventional blowers there is, on the box-like main body, a lateral air intake, meaning that if the user holds the blower with the hand that directs such hole toward himself, he must take care to hold it away from his body because, in the event of contact or close approach, there is the risk of occluding the air intake for example with his trousers.

Furthermore conventional engine-driven blowers have a frontal muffler, meaning that it is possible, during use, that when the user orientates the blower he directs the muffler toward himself, with the attendant risk of burns.

Finally, conventional blowers are expensive to produce.

The aim of the present application is therefore to resolve the above mentioned technical problems, eliminating the drawbacks in the cited known art and hence devising a blower structure that makes it possible to optimally blow for example leaves in a chosen direction without dispersing them further and therefore reducing the time to complete the job.

Within this aim, another object of the invention is to devise a blower that can be used more easily by gripping it with two hands.

Another object is to devise a blower that is low cost to make and which therefore has a lower purchase cost for the user.

Another object is to devise a blower that is structurally simple and can be used by the user while keeping it at a greater distance from his body easily and with little effort.

This aim and these and other objects which will become better apparent hereinafter are achieved by a blower structure, characterized in that it is constituted by a rotating head composed of a protective annular band which is provided with a blunt circumferential outer flap and is connected, by way of two or more vanes, to a support which is constituted by a flat base from which a propeller cuff protrudes below, it being possible to key said flat base onto a motorized head of a brush cutter, each one of said blades having a shape structure that is adapted to obtain an air flow oriented toward an axis of such flat base in a direction of such propeller cuff

In the embodiments illustrated, individual characteristics shown in relation to specific examples may in reality be interchanged with other, different characteristics, existing in other embodiments.

With reference to the figures, the reference numeral1generally designates a blower structure which is constituted by a rotating head2composed of a protective annular band3which is provided with a lower end4, an upper perimetric edge5and an inner lateral surface6.

A circumferential outer flap7protrudes externally from the lower end4of the protective annular band3; it is blunt, substantially U-shaped in cross-section, and can be associated with or welded to laterally or below the lower end4of the protective annular band3.

The protective annular band3is connected, in the specific embodiment shown, by way of three blades8a,8b,8cto a support9constituted by a flat base10from which a propeller cuff11protrudes below.

The height of the support9is substantially equal to that of the protective annular band3and is therefore substantially contained within it.

The flat base10is provided axially and centrally with a hole12, conveniently contoured, in order to allow the keying or positioning thereto of a pin13which protrudes from the motorized head14awhich is present at the end tip of a frame14, usually tubular and provided with two grips15a,15b, of a brush cutter16which comprises an engine assembly17, electric or gasoline, for the transmission of motion to the motorized head14a.

The coupling of the flat base10to the motorized head14ain fact makes it possible to rotate the rotating head2, usually anticlockwise.

In fact the motorized head14acan be accommodated within a cavity14bwhich is provided on the flat base10concentrically to the hole12, while the pin13is externally threaded for connection to a complementarily threaded nut14cwhich can be accommodated within a complementarily shaped seat14dwhich is provided on the propeller cuff11coaxially to the hole12.

Each blade8a,8b,8chas a curved shape, with the concavity facing away from the propeller cuff11.

Each blade8a,8b,8chas a first, upper point of attachment18a,18b,18carranged proximate to or at an outer perimetric edge19of the flat base10or at a lateral surface20of the propeller cuff11; subsequently each blade has an extension that brings it to rise upwardly, higher than the plane of arrangement of the flat base10, and therefore also of the upper perimetric edge5of the protective annular band3, in order to then descend downwardly in the direction of the inner lateral surface6, until it connects at or proximate to the upper perimetric edge5of the protective annular band3.

Each blade8a,8b,8chas a second, lower point of attachment21a,21b,21carranged proximate to or at the outer perimetric edge19of the flat base10or at the lateral surface20of the propeller cuff11; subsequently each blade has a shape structure that brings it to descend downwardly in the direction of the inner lateral surface6, until it connects proximate to or at the lower end4of the protective annular band3.

Each one of the blades8a,8b,8c, once the blower structure1is put into operation, generates a flow that is oriented substantially toward the axis of the flat base10in the direction of the propeller cuff11, thanks to their particular shape structure.

It follows from this that the overall flow of air generated by the three blades8a,8b,8cof the rotating head2is arranged substantially according to a cylindrical canalization.

Thus it has been found that the invention fully achieves the intended aim and objects, a blower structure1being obtained which concentrates the determination of the flow of air in a narrow area that is central to the rotating head, thus eliminating the lateral dispersion of air flows, all thanks to the shape structure of the blades8a,8b,8cwhich drive the air toward the center.

The air flow that is obtained therefore makes it possible to optimally blow for example leaves in a chosen direction without dispersing them further and therefore reducing the time to complete the job.

The blower can also be used by the user while keeping it at a greater distance from his body easily and with little effort.

The blower further requires a lower expenditure of energy, for the same work, thus requiring further less time to carry out the work.

The purchase costs of the blower structure1are lower than those of conventional blowers, since the user can also use a brush cutter which is already in his possession, simply by adding the rotating head2and connecting it thereto.

Furthermore, by using the coupling of the blower structure1with the brush cutter16, the problem of conventional blowers of gripping it with one hand only is eliminated, since there are two grips15a,15bin it which enable the user to hold and use the blower with two hands, making the work simpler and less tiring.

The presence of the double grip15a,15bof the blower according to the invention further makes it possible to use a blower under conditions of utmost safety given that the blower structure1connected to the brush cutter16can be held at a greater distance from the body of the user, thus reducing considerably the risk of burns.

The invention is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims. Obviously the materials used as well as the dimensions of the individual components of the invention may be more relevant according to specific requirements. The characteristics indicated above as advantageous, convenient or the like, may also be missing or be substituted by equivalent characteristics.

The disclosures in Italian Utility Model Application No. MI2015U000093 (202015902346964) from which this application claims priority are incorporated herein by reference.