WO2015056141A1

WO2015056141A1 - Foot-operated vehicle

Info

Publication number: WO2015056141A1
Application number: PCT/IB2014/065208
Authority: WO
Inventors: Fiorenzo DONETTI
Original assignee: Donetti Fiorenzo
Priority date: 2013-10-16
Filing date: 2014-10-10
Publication date: 2015-04-23
Also published as: ITBO20130564A1

Abstract

A movable seat for push locomotion of persons, formed by a comfortable saddle (S) connected to an essential locomotion frame that can run on the ground with at least two wheels (25, 27) at least one of which is steering, wherein the saddle (S) is provided with lateral and intermediate recesses, adapted to be engaged economically by the inner parts of the user's thighs and which define an intermediate area of the saddle with limited width, on which the user's pubic arch can rest and it has end parts divergent backwards and forwards in plan view, so that the seat of the saddle (S) substantially has the shape of an X in plan view and is produced by elastic or elastic-plastic cords, cables, wires or tapes.

Description

FOOT-OPERATED VEHICLE

DESCRIPTION

The invention relates to an evolution of the movable seat for push locomotion of persons described in the Italian patent no. 1 388 048 filed on 26-6-2008 by the same applicant, consisting of a comfortable saddle that rests on the ground through a minimal frame and with at least two wheels, at least one of which is steering, so as to allow a man or woman to remain comfortably seated and place two feet on the ground alternately or simultaneously, to generate therewith the push required to move forward or to remain stationary in total comfort. The distance between the front and preferably steering wheel and the rear wheel is very short, so that the person using the vehicle in question can move easily and safely even in narrow and crowded spaces, such as town centres, fairs or exhibition events in general, in large factories, during shopping trips, in supermarkets, in shows, in squares and in restricted traffic areas of town centres, and therefore in cities of art, and also on pavements and in general also during leisure outings. A vehicle of this kind is very light, as it is also produced with materials suitable for the purpose and preferably with overall dimensions that can be reduced in order to be transported and stored even in limited spaces, such as in a car, bus, coach, plane, train, elevator and in other places, also public. When folded in the condition of reduced overall dimensions, the vehicle can also be pushed and used as a trolley, as at least one of its wheels is resting on the ground.

The French patent FR 2 818 610 dated 28 June 2002 and the Dutch patent NL 1 028 301 published on 1 7 August 2006 are also cited as prior art. The first of these documents describes a push vehicle with two wheels, which in one of the many embodiments is provided with a seat with a raised front portion sloping forwards and extending upwards for a substantial section, on which the user can rest the chest, while resting one foot on a platform and using the other foot to push the vehicle forward. The other document describes a vehicle similar to the previous one, in which the seat is provided with a raised portion in the shape of a Y, the distal ends of which have padded parts destined for contact with the sides of the user's pelvis or torso, this saddle being mounted on the distal end of an articulated parallelogram structure, the fixed side of which consists of the short steering box, and which is connected with a shock absorber to the section of frame with the rear wheel. Both these solutions have parts fixed to the saddle and destined to come into contact with the chest or with the pelvis of the user, which although on the one hand allows good control of the vehicle when stationary, on the other considerably limits the body movements of the user who must push the vehicle to move forward.

The documents DE 202 09 498 U1 and JP H05 42078 U are also cited as prior art. These documents describe saddles with upward facing concave lateral profile and with a lower surface provided with scarcely marked intermediate recesses and widely joined with the front and rear parts of this saddle, which substantially duplicate the previous documents and are not useful for the purposes in question.

In the production and in trials for the use of these prior art vehicles, the limits that have been encountered mainly derive from the use of a saddle that has proved to be inappropriate for the purposes in question, as intrinsically of unsuitable shape, as it is connected to the frame of the vehicle so that it can swing in both transverse and longitudinal direction or, in the case in which it is fixed, as it is positioned at a great distance from the handlebar and/or as it is such as to limit the user's movements both when moving forwards by pushing and when the vehicle is stationary. The invention intends to overcome these and other limits of the prior art with a movable seat as claimed in the main claim and in the subsequent dependent claims, mainly characterized by the use of a saddle connected adjustably but rigidly to the locomotion frame and substantially having a seat in the shape of an X in plan view and advantageously made with an interweaving of elastic or elastic-plastic ropes, cables, wires or tapes. The saddle is preferably constrained to the steering box, to be at a short distance from the handlebar and to achieve the advantage of reduced overall dimensions and easy control of these handlebars and of the whole vehicle, even without using the hands. The characteristics of the invention and the advantages that derive therefrom will be more apparent from the following description of a preferred embodiment thereof, illustrated purely by way of non-limiting example in the figures of the three accompanying drawings, wherein:

- Fig. 1 is a plan view of the load-bearing structure of the saddle for the vehicle in question;

- Fig. 2 illustrates the saddle according to a front and complete perspective of the seat;

- Fig. 3 illustrates in side elevation the detail relating to the means for adjusting longitudinal tensioning of the seat of the saddle;

- Fig. 4 illustrates the saddle in elevation from the rear side, as indicated by the arrow K of Fig. 2;

- Fig. 5 illustrates one of the bars of the saddle in a horizontal cross section along the line V-V of Fig. 1 ;

- Figs. 6 and 7 illustrate two different details of execution of the bars of the saddle, with the seat, in a cross section along the line VI-VI of Fig. 5;

- Fig. 8 is a rear perspective view of the saddle mounted on a locomotion frame in the using condition;

- Figs. 9 and 10 illustrate the saddle mounted on a locomotion frame in side elevation and in two different operating conditions;

- Fig. 1 1 illustrates the saddle with the related locomotion frame in side elevation and in the condition with reduced overall dimensions.

With reference firstly to Figs. 1 to 4 it can be seen that the saddle S according to the invention comprises a front cross bar 1 slightly arcuate in shape, with the concave part oriented both forwards and downwards and with an extension L1 of around 20-22 cm (see below) and comprises a rear cross bar 2, for example with an extension L2 of around 30-32 cm (see below), also slightly curved and oriented with the concave part facing backwards and downwards and the two bars 1 , 2 are fixed at the bottom and symmetrically at the end of the forked and downward sloping branches of respective pairs of supports 3 and 4, which have the shape of a Y in plan view from above and which with their stems are disposed horizontally, are mutually abutting and are designed to be fixed to one another or to the proximal section of a flat arm 5 placed underneath and along the midline of the structure 1 , 2, 3, 4, which projects for a sufficiently long section from the front bar 1 and which will be used for connecting the saddle in question to a locomotion frame, as specified below. From Figs. 4 and 6 it can be seen that the forked ends of the supports 3 and 4 are connected to bars 1 and 2 with respective appendages 103, 104 oriented upwards to ensure sufficient distancing of these bars from the whole of the previously described cradle structure underneath, as these bars 1 and 2 are entrusted with the task of supporting the seat of the saddle S. Good results have been obtained, for example, by providing a spacing D between the intermediate parts of the bars 1 and 2 in the order of around 35 cm (see below). As illustrated in the detail of Fig. 5, the bars 1 and 2 can be section bars with a cross section of paraelliptical type and at least on the outer side are provided with a plurality of recesses or grooves 6 suitably distanced from one another, which give these bars a comb-like structure and have dimensions and orientation suitable to perform the functions specified below. The grooves 6 are such as to partly involve also the lower and upper sides of the bars 1 and 2, which they reach with progressive reduction of their depth, as shown by way of example in Fig. 5, from which it can be seen that at least on the ends of the bars 1 and 2 there are axially open holes 7 of sufficient depth (see also Fig. 2), which are in communication with the first of the grooves 6 of the corresponding ends of the bars, with a radial hole 8 that leads into the groove 6 with a suitably flared and rounded edge, so as to facilitate insertion in this hole 8, from outside, of the end of an elastic or elastic-plastic rope or cord 9, with diameter correlated to that of the grooves 6, which is inserted into the hole 7 and is then extracted from this hole and knotted to form an end thickening or knot 109, and which is then pulled from the outside of the hole 8 so that this knot 109 enters the hole 7 and remains concealed, protected and firmly fastened therein. Good results have been obtained with the use of an elastic cord 9 of the type used to tighten tarpaulins for covering trucks or for fastening goods on vehicle roof-racks, cords with a diameter of around 5-6 mm, for which the dimensions and shape of the grooves 6 and of the various holes indicated above are suitably correlated. It is understood that in place of the elastic cords I other equivalent materials can be used, also with elastic-plastic properties and even if in the description below reference is made, purely for ease of presentation only to elastic cords 9. After having fastened the end of the elastic cord 9 to the end of one of the bars, for example to the right end of the rear bar 2 shown in Figs. 1 and 2, the cord is taken first outwards and then upwards and is then stretched towards the other bar 1 , as indicated by the arrow F, so that this cord engages the first of the grooves 6 of the group 6' of grooves of the bar 2 and is guided with the right tension, from the top downwards as indicated by the arrow F', into the innermost end groove of those of the group 6" of grooves of the front bar 1 , after which the cord is taken under the rear bar 2, is guided into the second of its grooves 6' and then stretched and guided into the second and innermost of the grooves 6" of the front bar 1 and this sequence continues until the cord 9 involves the innermost of the grooves 6' of the rear bar 2 and the end groove of the group of grooves 6" of the front bar 1 , so as to form the first oblique part 9' of the seat of the saddle S (Fig. 2). The tail end of the cord 9 with which said part 9' of seat is formed can be fastened to the left end of the front bar 1 , with the same solution described with reference to Fig. 5 for the head end of the cord, or this cord 9 can be guided in tension, from the bottom upwards, into the innermost groove of the left group of grooves 6"' of the rear bar 2 (Figs. 1 , 2) and from here guided from the bottom upwards, always in tension, as indicated by the arrow F", onto the outermost of the right group of grooves 6"" of the front bar 1 to then continue to be guided on the remaining grooves 6"' and 6"" until the tail end is fastened in the left end hole 7 of the rear bar 2, as explained above for the head end of the cord 9. With this last winding of elastic cord 9 the second oblique part 9" of seat is formed, which will be crossed over and placed above and below the intermediate part of the first part of seat 9', to form as a whole a seat substantially in the shape of an X in plan view, having a width L in the intermediate and narrower section, for example of around 1 1 -12 cm (see below). It is also understood that the above is a preferred but non-exclusive embodiment of the seat with the use of elastic cords crossed over in an X, which can be modified, for example, by guiding the cords alternately over and under the bars 1 and 2, to form a seat that, in the intermediate crossover area, is at a lower level than the portion fastened to the bars 1 , 2. Modifications can also be made to the bars 1 and 2, for example to eliminate sliding friction between these bars and the elastic cords each time the weight of the user is loaded thereon and discharged therefrom and for this purpose the bars could also be produced with a sturdy steel core, with a round cross-section, onto which rotating rings can be inserted side by side and each provided with an annular groove 6 into which to guide an elastic cord 9. With this solution, not illustrated as it can be understood from the description above, the cords will work with rolling friction with the respective grooved end rings, while the sliding friction ins transferred between the rings and the underlying steel core and can be limited by producing at least the internal part of the rings with an appropriate plastic material. To prevent the elastic cords 9 from accidentally exiting from the related grooves 6 of the bars 1 , 2 or of said rollers of the aforesaid variant, small casings 100, 200 can be removably fixed to the bars 1 , 2, with the ends and, if necessary, also with the intermediate part; these casings, indicated with a dashed line in Figs. 1 , 6 and 7, are preferably positioned outside said bars 1 and 2, in a position in which they close the grooves 6 and do not interfere with the user's body. Alternatively to this solution, the grooves 6 can be replaced by or combined with holes through which the cords 9 pass. The saddle S with the seat formed by elastic cords 9 stretched between the bars 1 and 2 and crossed over one another in the shape of an X, can usefully be provided with means for adjusting the tension of the elastic cords, to adapt it to values optimal for the user. For this purpose, the horizontal sections 203 of the front support 3 can, for example, be firmly fixed on the arm 5 with transverse bolts 10, while the horizontal portions 204 of the rear support 4 are provided with longitudinal slots 1 1 through which there pass bolts 12 that involve the intermediate arm 5 to allow the support 4 to slide guided longitudinally on the arm 5, to be able to perform thereon a movement correlated to the dimension of said slots 1 1 . The horizontal sections 204 of the support 5 are interconnected by a bridge 13, for example welded, that carries a lead screw 14 aligned with the longitudinal axis of the saddle and into which there can be screwed the stem of a screw 15 that passes through a hole 16 of a plate 17 welded with upward extension on the proximal end of the arm 5 and against which the head 1 15 of said screw 15 rests. By exerting on the screw 15 a tightening action, which consequently draws the bridge 13 towards the reaction plate 17, the support 4 is moved away from the support 3, and it is consequently possible to tighten the X- shaped seat formed by the elastic cords 9, to the desired values, easily controllable with a torque wrench. From Figs. 1 , 2, 8 and 9, it can be seen that the flat longitudinal arm 5 projects from the front bar 1 of the saddle S with a short section, for example around 1 1 -12 cm (see below), having a slightly upward sloping intermediate structure and a distal section substantially parallel to the proximal section, placed at a slightly lower height to that of the seat 9', 9" of the saddle S and which terminates with a rounded upper angle area 18 and with a flat section 1 18 orthogonal to a longitudinal slot 19 of the arm 5, on the front end of which the centre of curvature of said angle area 18 lies. When the saddle S is in the position of use as shown in Figs. 8 and 9, the front end of the slot 19 cooperates with the fulcrum pin 20 of the fork part 121 of a clamp 21 , for example of elastic type, fixed adjustably in height on the vertical steering box 22 of the frame of the vehicle in question, while the front side 1 18 of the arm 5 rests on the vertical bottom of said fork 121 , so that the arm 5 remains stably aligned with the fork 121 and with an arrangement cantilevered therefrom. It is understood that, if necessary, the arm 5 can be produced in telescoping form and can be provided with rear or intermediate means for adjusting the length and for consequent adaptation to the user's needs, all in a manner readily understood by those skilled in the art. The steering box 22 has a height, for example, of around 30- 40 cm (see below) and will have high bending strength and resistance to mechanical deformations in general (see below), as there is mounted rotating therein the steering column 23, to which there is fixed at the top the adjustable handlebar 24 (see below) and integral with the lower end of which is the front fork 123, which in the arrangement of Fig. 9 is slightly sloping forwards and rotatably supports the hub of the front wheel and tyre 25 for example of 24 inches (see below), the rotation axis of which is advanced from the steering axis by around 2-2.5 cm (see below). The lower end of the steering box 22 is preferably strengthened and is welded laterally to the front end of a tubular strut 26 that has a initial section 126 curving downwards and which terminates with the rear fork 226 that rotatably supports the hub of the rear wheel and tyre 27, for example of 20 inches (see below). The strut 26 has a hinge 28 in the intermediate part, for example of the type used in fold-up bicycles, by means of which the vehicle in question can be taken from the using position, as shown in Figs. 8-10, with the strut 26 extended, to the idle and fold-up position as shown in Fig. 1 1 , with the rear fork 226 and the rear wheel 27 placed laterally and at a short distance from the front wheel 25. From Fig. 1 1 it can be appreciated how it is possible to further reduce the dimensions of the vehicle in the idle condition, by rotating the saddle S upwards so as to cause it to rotate through approximately 90° about the fulcrum pin 20, to orient the slot 19 vertically. In these conditions, the saddle S can be pushed downwards and the slot 19 can be taken to cooperate with the pin 20 with the end thereof closest to the saddle, so that the rounded end 18 of the arm 5 touches with eccentric arrangement the bottom of the fork 121 and remains vertically blocked therein, also due to the weight of the saddle S. The clamp 21 can be made to slide downwards and moved towards the tube 26, so as to further reduce the idle dimensions of the saddle S. The handlebar 24 can be used as handgrip to move the vehicle in the manner of a trolley, with rotation only of the wheel 25, and if necessary can also be rotated downwards as shown by the arrow F'" and taken to a condition of reduced overall dimensions. The wheels 25 and 27 can be partly protected by casings 29, 29', both for aesthetic and for obvious safety reasons. Figs. 8 and 9 show that in the condition of use of the vehicle, the user adjusts the height of the saddle S to his or her needs, loosening and sliding the clamp 21 on the box 22 and then tightening it in the desired position, so that when the user sits on the saddle S, the whole of the sole of the feet can rest on the ground. To facilitate adjustment of the height of the clamp 21 , it can be replaced in the part destined to cooperate with the box 22 with a sliding bushing adjustable in height with simple screw and lead screw adjustment means. Alternatively, the bushing replacing the clamp 21 can have an internal section with a radial enlargement that slides on a bead fixed longitudinally on the box 22 and provided along the whole extension thereof with transverse through holes or with teeth in which or between which there can be inserted a bolt that passes through the corresponding transverse holes from said bushing part of the clamp 21 . With this variant it is possible to make adjusting the height of the saddle faster and, with said bead, to strengthen the steering box 22 against flexural-torsional stresses. When the vehicle is in the condition of Fig. 9, with the axis of the front wheel 25 positioned in front of the steering axis, the wheelbase C1 between the wheels 25 and 27 is around 600 mm (see below) and the use of a handlebar 24 is provided for, for example, of the type currently used in exercise bikes, articulated and placed in front of the steering axis, oriented upwards and forwards so that the user can ambulate remaining comfortably seated on the saddle S and can bend the torso forward slightly, to be able to safely control the handlebar 24 and even travel for long distances, both uphill and downhill, with minimum effort. From Figs. 8 and 9 it can be appreciated how, in the condition of use of the vehicle, it is possible to exploit the flexibility and elasticity deriving from direct connection of the saddle to the steering box 22 and from having produced a very flexible and elastic frame 22, 26, to make ambulation of the user on the vehicle in question fluid both on smooth and rough surfaces. In a future development of the vehicle, to allow it to be adapted to people of different weight and/or to allow greater adaptation of the vehicle to the different needs of users, the steering box 2 could be connected below the strut 26 with the interposition of a transverse swing hinge, parallel to the axis of the rear wheel 27, provided with a limit stop that prevents the angular distance between the parts 22 and 26 from exceeding a predetermined maximum value, for example of approximately 90° as shown in Fig. 9, but which allows the parts 22 and 26 to swing towards each other opposing the elastic and adjustable action of at least one shock absorber of any type, even simplified and of limited weight, such as those that use elastomeric inserts.

The strut 26 of the frame has been sized so that if the user has to remain stationary or travel short distances on the flat and requires to have both hands free, he or she can have maximum control of the vehicle by disposing it rapidly in the arrangement of Fig. 10, i.e. rotating the handlebar 25 through 180° about the steering axis, to rest the handlebar 24 against the chest and prevent rotation thereof, thereby obtaining the freedom to use both hands for other purposes. In these conditions, the front wheel 25 is disposed from the rear wheel 27 with a wheelbase C2 of only 500- 520 mm (see below), facilitating control of the vehicle by the user both while stationary and during small movements on the flat, with the possibility of moving or remaining stationary easily and in safety even in limited spaces. The advantages deriving from the movable seat described can thus be summarised.

It is evident that the most innovative part of the invention consists of the saddle

S with the elastic and X-shaped structure of its seat, which is comfortable when the person is seated, stationary and with feet resting on the ground and the shape of which changes and adapts to the movements of the legs when these swing to move the vehicle forward by pushing the feet on the ground, while allowing constant control of the vehicle, both in the presence of relative forward and backward movements, due to the shape of the seat of the saddle S divergent both forwards and backwards. The thighs of the legs are positioned in the intermediate and most discharged part of the seat of the saddle S, so that they are in the position of minimum interference therewith both when idle and when swinging backwards and forwards to push the vehicle. During this swinging, the thighs of the legs touch the outer lateral parts of the seat, which are formed of only a few elastic cords and are therefore extremely pliable and adapt with limited resistance to swinging of the legs. The thighs of the legs also have to cooperate with these lateral parts of the seat while controlling the forward and backward lateral and longitudinal pushes of the vehicle, without the limits imposed by prior art saddles. Due to the X-shape and to the elasticity of its seat with crossed over bands 9', 9" and due to the arcuate shape, to the orientation and to the different dimensions of the bars 1 , 2, the saddle as described is able to ensure a wide and strong support, great adaptability to the person's anatomy, without in any way limiting the movements of this person, both when the vehicle is moving and when it is stationary. The seat produced with elastic ropes forms a reticular and breathable surface, with consequent advantages of preventing perspiration of the user's body parts that come into contact with the seat. If required, the saddle can be provided with an elastic saddle cover, of reticular type, breathable and suitable for the purpose.

The possibility of reducing the overall dimensions of the vehicle has already been mentioned above. The vehicle described is also suitable to be made of light metal alloys, of carbon fibre and/or of composite materials that combine properties of high mechanical strength and very low weight, and in this case a microchip could be embedded in the frame for identification of the vehicle in case of theft. The dimensions cited in the present description are purely indicative and can be varied as a function of the weight and height of the person for which the vehicle in question is destined. The vehicle described can be provided with accessory parts for holding bags, computers or the like, can be provided with optical and acoustic signalling means and with at least one brake on the front and/or rear wheel, also of the energy recovery and release type. It would also be possible to use flywheels for the storage and release of kinetic energy. If necessary, the vehicle can be provided with a wheel with motorized hub and a related electric battery, of rechargeable type. Particularly in this last case, the vehicle could be provided with small retractable platforms on which to rest the feet. Therefore, it is understood that the description refers to a preferred embodiment of the invention, to which numerous variants and modifications can be made, without departing from the guiding principle of the invention, as described, illustrated and as claimed below. In the claims, the references indicated in brackets are purely indicative and do not limit the scope of protection of the claims.

Claims

1 . Movable seat for push locomotion of persons, formed by a comfortable saddle (S) connected to an essential locomotion frame that can run on the ground with at least two wheels (25, 27) at least one of which is steering, characterised in that the saddle (S) is provided with lateral and intermediate recesses, adapted to be engaged ergonomically by the inner parts of the user's thighs and which define an intermediate area of the saddle with limited width (L), on which the user's pubic arch can rest and in that it has end parts divergent backwards and forwards in plan view, all to form a comfortable seat which allows the user to control, only with the legs and with extreme ease, without effort and without substantial limitations of movements, both the relative lateral and longitudinal movements forwards and backwards of the movable seat in question, both when it is moving and when it is stationary, said seat of the saddle (S) being made of any sufficiently elastic or elastic-plastic material, to have suitable bearing properties and be simultaneously very adaptable to the anatomy and to the movements of the user, for this purpose the seat of the saddle (S) substantially having the shape of an X in plan view and being produced by crossed over elastic or elastic-plastic cords, cables, wires or tapes so as to be comfortable when the person is seated, stationary and with feet resting on the ground and the shape of which changes and adapts to the movements of the legs when these swing to move the vehicle forward by pushing the feet on the ground, while allowing constant control of the vehicle, both in the presence of relative forward and backward movements, due to the shape of the seat of the saddle (S) divergent both forwards and backwards.

2. Movable seat according to claim 1 ), wherein the seat of the saddle (S) is formed with elastic or elastic-plastic cords (9), cables, wires or tapes, fastened, guided and wound with tension, so as to form at least two warps (9', 9") crossed over one another in an X, between at least one front bar (1 ) and one rear bar (2) that form respective front and rear transverse parts of the frame of the saddle (S), these bars (1 , 2) being characterized by having adequate and preferably different extensions (L1 , L2), by being curved and oriented towards the outside with the concave part, and by being suitably distanced (D) from one another and by being provided with a comb-like structure and, at least on the outer side, with grooves and/or holes (6) to contain and maintain correctly guided and oriented said cords (9), also with the aid of optional casings (100, 200).

3. Movable seat according to claim 2), wherein, according to a constructional variant, the front (1 ) and rear (2) bars of the frame of the saddle (S) are each formed of a sturdy steel core, with round cross-section, on which core there are mounted side by side rotating rings, each provided with an external annular groove (6) in which the elastic cords (9) that form the seat of the saddle can be guided, these rings being produced at least with the part in contact with said core of the bars (1 , 2) with a self-lubricating material, such as a plastic material with low friction coefficient.

4. Movable seat according to claim 2), wherein said bars (1 , 2) are supported by respective pairs of lower supports (3, 4) in the shape of a Y in plan view, fastened with their stem (203, 204) to the proximal section of a flat arm (5) positioned longitudinally and edge-on under the saddle (S) and which projects frontally therefrom with a section of limited length that is connected in an adjustable manner to the steering box (22) of the locomotion frame, the stem (203) of one of said supports (3) being fixed with bolts (10) to said arm (5), while the stem (204) of the other support (4) is mounted on the arm (5) with the interposition of longitudinal guide means (1 1 -13) and with the interposition of adjustment means (14-17) through which it is possible to adjust the distance between said bars (1 , 2) and the tension of the elastic cords (9) forming the seat of the saddle (S).

5. Movable seat according to claim 4), wherein said longitudinal and lower arm (5) of the saddle (S) is optionally adjustable in length and is connected with its distal end to a support (21 ) arranged to be fixed with the possibility of adjusting the height, to adapt the saddle to the user's physical requirements, on a sturdy and sufficiently high steering box (22) integral at the bottom with at least one strut (26) that extends under the saddle and terminates with a fork (226) that supports the rear wheel (27), there being mounted rotating in the steering box (22) the steering column (23) that carries at the top an adjustable handle bar (24) and at the lower end of which there is fixed the fork (123) that supports the front wheel (25).

6. Movable seat according to claim 5), wherein said support (21 ) can be produced in the form of elastic clamp or as a bushing with a non-round cross-section, sliding on an outer non-round section of the steering box (22) provided with at least one longitudinal reinforcing and guiding rib and adjustment means are provided to adjust the height of said support (21 ).

7. Movable seat according to claim 5), wherein the lower and longitudinal arm (5) of the saddle (S) is connected to the support (21 ) that slides on the steering box (22) with means (18, 1 18, 19, 20, 121 ) that allow the arm (5) to rotate upwards and also to be stabilized in the raised position when it is necessary to reduce the overall dimensions of the locomotion frame with which the saddle (S) is associated.

8. Movable seat according to claim 5), characterised in that according to a variant of embodiment the steering box (22) can be connected below the strut (26) of the locomotion frame, with a transverse swing hinge, parallel to the axis of the rear wheel (27), provided with a limit stop that prevents the angular distance between said steering box and said strut (22, 26) from exceeding a predetermined maximum value, but which allows the steering box and strut (22, 26) to swing towards each other opposing the elastic and adjustable action of at least one shock absorber of any type, even simplified and of limited weight.

9. Movable seat according to claim 5), characterised in that the front fork (123) is sloping with respect to the steering axis and the handlebar (24) can be rotated through 180° about this steering axis, to be able to orient the front fork (123) from the usual position sloping forwards and with a wheelbase (C1 ) between the wheels (25, 27) of approximately 600 mm, useful to travel with the vehicle over long distances, to a position sloping backwards that allows the wheelbase between the wheels (25, 27) to be reduced to approximately 500 mm, with the possibility of positioning the handlebar (24) in contact with the user's chest, to prevent rotation thereof, while the user obtains the freedom to use both hands, and the possibility of safely controlling the movable seat both while stationary and during small movements on the flat and to be able to remain stationary or move in safety, even in limited spaces.

1 0. Movable seat according to claim 5), wherein said tubular strut (26) is provided with a hinge or other intermediate device (28) that allows the section of the strut with the fork (226) and with the rear wheel (27) to be folded or otherwise positioned, laterally and at a short distance from the front wheel (25), to reduce the overall dimensions of the movable seat when it is not used and must be stored in a limited space.