A SET OF A WHEEL AND A FRAME PART FOR A BICYCLE, AND A BICYCLE COMPRISING

SUCH SET

FIELD OF THE INVENTION

The present invention is enclosed in the area of bicycles, in particular bicycles with hubless wheels.

PRIOR ART

Common bicycle wheels have a hub or centred axle to which a rim and a tyre are connected by means of spokes. However, such solution typically leads to a reduction of safety for the cyclist, which may get hurt when touching a rotating wheel, in particular by being hit by the spokes of such wheel.

Other solutions exist in the art, such as the case of patent application US6050584, which discloses a bicycle with a hubless wheel. Although not having the referred safety issue present in wheels with hub, it maintains the complex structure of the common wheels.

The present solution innovatively overcomes such issues.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention a set of a wheel and a frame part, both suitable for a bicycle, wherein the frame part comprises a first longitudinal part and a second longitudinal part, and the at least one wheel comprises: - a central ring in turn comprising a plurality of bearings,

- a rim, arranged around and rotatable in relation to said central ring, being rotatable by means of said plurality of bearings, and

- a bicycle tyre, which is connectable to and rotates jointly with the rim,

wherein the first longitudinal part is suitable to be coupled to a first side of the central ring of the wheel and the second longitudinal part is suitable to be coupled to a second side of the central ring of the wheel, the first and second sides being opposite to one another. Such consists of a simple and effective solution to provide a hubless wheel structure, which requires only two longitudinal parts of the frame part coupling to the central ring. The central ring comprises bearings and thereby provides for the rotation of the rim and tyre ensemble in relation to the central ring and to the frame part.

In an advantageous solution which better substantiates the simple and effective construction of the set of the present invention, each of the first and second longitudinal parts comprises an elongated portion and a wheel coupling portion - which are depicted in the examples of Figures 1-5 -, wherein i) the wheel coupling portion provides for the coupling to the side of the central ring and ii) an opening is provided between the elongated portion and the coupling portion, the wheel passing and rotating through such opening. Advantageously, and reinforcing such simple construction, the first longitudinal portion consists of a single piece, and the second longitudinal portion consists of a single piece.

It is also an object of the present invention a bicycle comprising the set of the present invention, as of any of the described embodiments of the set. Such consists of a safe and yet simple construction bicycle. Preferably, the bicycle comprises two sets according to the present invention, the two sets being coupled to each other and rotatable with regard to one another, and wherein a steering wheel is coupled to the elongated portion of one of the sets which consists of a first set. In addition, the bicycle may further comprise a seat, the seat being provided in the elongated portion of a second set which does not comprise said steering wheel.

DESCRIPTION OF FIGURES

Figure 1 - representation of an embodiment of the set of a wheel and a frame part (1) (both suitable for a bicycle) of the present invention (partial representation), in which the frame part (1) is highlighted, as well as the elements of the wheel, including the tyre

(4), the central ring in turn comprising a plurality of bearings (3) and the rim (2) in between. The rim (2), by being rigid, provides for the non-deformation of the ensemble tyre (4) and rim (2). The rim (2) and tyre (4) thereby rotate in relation to the central ring and the frame part (1). The frame part (1) is coupled to the central ring, therefore being fixed to each other. In Figure 1, only a longitudinal part is represented. The representation of Fig. 1 may therefore correspond to the first embodiment as described below, comprising no pedals or pedal axle (5).

Figure 2 - representation of the same embodiment as of Figure 1, in the present case both longitudinal parts coupling to the central ring. The elongated portion (6) and the wheel coupling portion (7) of the frame part (1) are represented.

Figure 3 - representation of another embodiment of the set of a wheel and a frame part (1) (both suitable for a bicycle) of the present invention (partial representation). This representation of Fig. 3 may therefore correspond to the second embodiment as described below, comprising pedals and a pedal axle (5), as well as a tyre (4) which consists of a timing belt. The timing belt envelops both the rim (2) and the pedal axle

(5), thereby providing for the movement of the wheel and rim (2) in relation to the central ring and frame part (1). The rotation imposed by the pedal axle (5), by means of the pedals (not represented) is transmitted to the tyre (4) which rotates in relation to the central ring by means of the bearings (3), and thereby provides for the movement of the tyre (4) over the ground. Figure 4 - representation of the same embodiment as of Figure 3, in the present case both longitudinal parts coupling to the central ring. The elongated portion (6) and the wheel coupling portion (7) of the frame part (1) are represented.

Figure 5 - perspective view of representation of an embodiment of a bicycle (100) comprising two sets according to the present invention. The elongated and wheel coupling portions (6, 7) of the two sets are represented, as well as a seat (8) and a steering wheel (11). The seat (8) is coupled to one of the sets, and the steering wheel (11) is coupled to the other set. The set to which the seat (8) is coupled comprises a core portion (13). The seat (8) also comprises an elongated coupling portion (9) and the core portion (13) has an opening (partially shown) suitable for coupling to the elongated coupling portion (9).

Figure 6 - side view of representation of the embodiment of a bicycle (100) of Figure 5. The elongated coupling portion (9) of the seat (8) is connected to the core portion (13) by means of the opening (shown) suitable for coupling to the elongated coupling portion (9). The seat (8) may therefore be fixed at different distances from the elongated portion (6).

DETAILED DESCRIPTION

The more general and advantageous configurations of the present invention are described in the Summary of the invention. Such configurations are detailed below in accordance with other advantageous and/or preferred embodiments of implementation of the present invention.

In another inventive aspect of the present invention, the frame part (1) comprises a core portion (13), the core portion (13) coupling the elongated portions (6) of the first and second longitudinal parts, and the core being so arranged that it provides for the opening between the elongated portions (6) and the wheel coupling portions (7), preferably by having a length lesser than the length of the elongated portions (6). This configuration is clearly shown in Figures 1-4. The core portion (13) consists of an additional element which provides for the integrity and robustness of the set (10) of the present invention, while maintaining the safe structure which separates the user from rotating elements.

In another advantageous embodiment of the set (10) of the present invention, combinable with any above described, the wheel coupling portions (7) have substantially a ring shape, having the shape of a ring except in a connection with the elongated portion (6) and, when the wheel coupling portions (7) are coupled to the central ring, a hole is formed within the wheel. Such configuration - which is represented in the figures - provides that the longitudinal portions [in particular their wheel coupling portions (7)] couple robustly to the central ring. In a preferred and advantageous embodiment, each coupling portion has i) an inner radius which is equal or lower than an inner radius of the central ring of the wheel and an ii) an outer radius which is lesser than the radius of the tyre (4), such that the tyre (4) protrudes from the wheel coupling portions (7) and thereby, when in action, contacts the ground. Thus, not only the frame part (1) couples robustly to the wheel as it also couples to no more than the wheel, maintaining the functionality of the structure in a simple construction.

Preferably, the plurality of bearings (3) is equally spaced around the central ring, preferably consisting of six to twelve bearings (3). . Such provides for an even rotation of the rim (2) and tyre (4) with regard to the central ring. For instance, the embodiments represented in Figures 1 and 3 (as well as Figures 2 and 4, even though not shown) contain eight equally spaced bearings (3).

In another preferred embodiment, the rim (2) is rigid, thereby providing for the non-deformation of the ensemble tyre (4) and rim (2). In a first embodiment of the set (10) of the present invention, which is depicted in Figures 1 and 2, the frame part (1) comprises no pedals. A bicycle (100) comprising such set (10) is therefore motioned directly by the feet of the user in contact of the ground.

In a second embodiment of the set (10) of the present invention, which is depicted in Figures 3 and 4, the frame part (1) comprises a pedal axle (5) and pedals coupled to the pedal axle (5), the pedal axle (5) being parallel to the bearings (3), and the tyre (4) consists of a timing belt, the timing belt tyre (4) being arranged such that it envelops the rim (2) and the pedal axle (5), such that the movement of the pedals is transmitted to the timing belt tyre (4). Thus, by consisting of a timing belt and therefore being flexible, the timing belt tyre (4) is able to be arranged around the rim (2) and the pedal axle (5), and thereby provide for a solution which - in a very simple and yet effective way - combines a hubless wheel with a pedal bicycle (100).

In an inventive aspect according of the second embodiment, the frame part (1) may further comprise two routing axles (14), the routing axles (14) being parallel to the pedal axle (5) and being provided between the elongated portions (6) of the first and second longitudinal parts, such that the timing belt tyre (4) is routed from enveloping the rim (2) to enveloping the pedal axle (5). Such provides for an efficient way to embed the timing belt between the rim (2) and the pedal axle (5). In particular, and as of Figures 3 and 4, the elongated portions (6) of the first and second elongated parts cover entirely such section of the timing belt wheel.

It also consists of an invention a hubless wheel comprising a central ring in turn comprising a plurality of bearings (3), a rim (2), arranged around and rotatable in relation to said central ring, being rotatable by means of said plurality of bearings (3), and a bicycle tyre (4), which is connectable to and rotates jointly with the rim (2), wherein the bicycle tyre (4) consists of a timing belt. Such bicycle tyre (4) could be included in the set (10) of the present invention and/or in the bicycle (100) of the present invention, by being combined with the referred frame part (1) which comprises a pedal axle (5) and pedals coupled to the pedal axle (5), the pedal axle (5) being parallel to the bearings (3), in such case the tyre (4) being arranged such that it envelops the rim (2) and the pedal axle (5), such that the movement of the pedals is transmitted to the tyre

In an embodiment of the bicycle (100) of the present invention, the set (10) comprising the steering wheel (11) consists of a front portion of the bicycle (100) and set (10) the comprising the seat (8) consists of a back portion of the bicycle (100) (case of Figures 4 and 5), the front portion of the bicycle (100) consisting of a set (10) which does not comprise a timing belt tyre (4). Preferably, the seat (8) comprises an elongated coupling portion (9) and the core portion (13) has an opening suitable for coupling (12) to the elongated coupling portion (9), the elongated coupling portion (9) and the opening of the core portion (13) being such that the seat (8) is able to be fixed at different distances from the elongated portion (6).

As will be clear to one skilled in the art, the present invention should not be limited to the embodiments described herein, and a number of changes are possible which remain within the scope of the present invention.

Of course, the preferred embodiments shown above are combinable, in the different possible forms, being herein avoided the repetition all such combinations.