Covering structure for a two-wheeler vehicle

A covering structure for a two-wheeler vehicle, in particular a scooter, said covering structure acting as a shield at least above the driver's place of scooter, and consisting at least of two elements folding up one on the other. According to the invention, said folding elements (7,8) are obtained each one in a monoblock.

DESCRIPTION
 The present invention relates to a covering structure for a two-wheeler
 vehicle, in particular a scooter, said covering structure acting as a
 shield at least above the driver's place of said scooter, and consists at
 least of two elements folding up one on the other.
 From the document EP 0 891 920, whose teaching is fully incorporated
 herein, a two-wheeler vehicle is known, called scooter, i.e. having small
 diameter wheels, a bodywork in plastic material and a tubular frame.
 Additionally, unlike other standard scooters, said scooter described in
 the document EP 0 891 920 is equipped of an enwrapping structure, which
 forms a protecting shield above the driver and a likely passenger, said
 protecting shield being eventually integrated by doors with deflecting
 windows. This protecting shield is adjustable in order to let the user
 have variable protection degrees, as required.
 In particular, this protecting shield has a folding roof, i.e. it can be
 folded up and placed in the scooter luggage compartment without stripping
 it off the bodywork, likewise as it happens for convertible cars.
 However, a similar protecting shield containing bearing elements, which is
 normally obtained by means of a metal frame covered by plastic elements,
 has several drawbacks. In fact, since such a protecting shield is a
 structure rising above the driver, its mass will considerably shift the
 centre of gravity of the vehicle, causing quite dangerous unbalances while
 driving the vehicle. Moreover, the protecting shield, for the presence of
 the frame and of the plastic aesthetic covering plus a large number of
 articulations and hinges for folding up, requires many different parts to
 be fitted together when it is assembled; this entails high production
 costs due to both the number of parts required and assembly operation
 itself.
 Furthermore, having to assemble many parts is to the detriment of the
 precision and quality of the protecting shield and will also reduce design
 flexibility.
 It is the object of the present invention to solve the above drawbacks and
 provide a covering structure for a two-wheeler vehicle having a more
 efficient and improved realization with respect to existing solutions.
 In this frame, it is the main object of the present invention to provide a
 covering structure for a two-wheeler vehicle, whose shield structure has a
 weight such not to jeopardize the vehicle drive.
 A further object of the present invention is to provide a covering
 structure for a two-wheeler vehicle having a protecting shield, which
 requires a reduced number of elements to be assembled.
 A further object of the present invention is to provide a covering
 structure for a two-wheeler vehicle having a protecting shield, which
 allows a higher manufacturing precision and design flexibility at the same
 time.
 A further object of the present invention is to provide a covering
 structure for a two-wheeler vehicle having a protecting shield, which can
 be obtained at a lower cost.
 In order to achieve such aims, it is the object of the present invention to
 provide a covering structure for a two-wheeler vehicle incorporating the
 features of the annexed claims, which form an integral part of the
 description herein.

In FIG. 1 is represented in a partial prospective view the rear side of a
 scooter 1, comprising a rear seat 2, which is contained inside a tail 3
 forming the rear side of the scooter 1. Said tail 3 has aerodynamic
 profiles 4 sideways, whereas its upper section is associated to a folding
 shield 5. Said folding shield 5 consists of an upright element 7 connected
 to a small roof 8. The upright element 7 has substantially a "U" shape,
 with two arms 9 and 10 and a cross-bar 11, which delimit a rear window 25.
 Both arms 9 and 10 are hinged to the tail 3, whereas the cross-bar 11 is
 hinged to the small roof 8. Additionally, the tail 3 has a housing (12 of
 FIG. 2) with a removable lid 13. Said removable lid 13 is hinged to the
 lower section of the tail 3. Moreover, the scooter 1 has two side
 bulkheads 14, which are hinged to a front shield 15 of the scooter 1, and
 are used as a side guard or door for the driver.
 As it can be seen in FIGS. 2 and 3, if the folding shield 5 is not in use,
 it is folded and placed inside the housing 12. In fact, the small roof 8
 can be folded to bring it parallel to the upright element 7, while the
 arms 9 and 10 of said upright element 7 are hinged inside the housing 12,
 in manner that the folded shield 5, can be rotated until it is completely
 inside said housing 12, on which the removable lid 13 is then closed.
 In FIG. 4 is represented a partially sectioned detail of the folding shield
 5. As said above, the folding shield 5 consists subtantially of two parts,
 i.e. the upright element 7 and the small roof 8. Said two parts, i.e. the
 upright element 7 and the small roof 8 are manufactured each one as a
 monoblock, which is obtained by thermoplastic gas injection moulding. Such
 a moulding technique allows the production of plastic parts with cavities,
 which therefore at one time are light and have a high structural rigidity.
 The plastic material used is Zytel.TM.. In FIG. 4 is also showing a
 section 20 of the arms 9 and 10 of the upright element, identifying them
 as hollows. Similarly, FIG. 4 shows how the small roof 8 is obtained in a
 single piece by thermoplastic gas injection moulding, comprising a
 platform 16, which is solid and has peripheral ribs 17, identified by a
 hollow section 21.
 FIG. 5 is represented a further view of the folding shield 5, formed by the
 upright element 7 and the small roof 8. The upright element 7 has slots 27
 on arms ends 8 and 9; these slots are apt to house some pins not shown
 here, which are comprised in the housing 12 for hinging the folding shield
 5 to the scooter 1. Said slots 27 are also obtained as one-piece parts
 during moulding operation of the upright element 7. The upright element 7
 also has further slots 18 in its upper section, which also pertain to the
 monoblock consisting of the upright element 7. Said slots 18 are apt to
 join together with pins 19 pertaining to the monoblock of the small roof
 8, realizing the hinge that allows the folding shield 5 to fold up. FIG. 5
 also shows some hooks 24 for engaging the small roof 8 to the front shield
 15 of the scooter 1.
 In FIG. 6 is represented a detailed view of a side bulkhead 14, also made
 from a monoblock obtained by thermoplastic gas injection moulding. Said
 side bulkheads 14, in fact, comprises an upright 26, which has a hollow
 shape obtained by gas injection, whereas also the ribbings 29 and 28 are
 partially hollow.
 From the above description the features of the present invention as well as
 the relevant advantages thereof are clear.
 The covering structure for a two-wheeler vehicle according to the present
 invention has advantageously a highly reduced mass, being manufactured
 from monoblocks of plastic material, with cavities. Advantageously, this
 drastically decreases the unbalances caused by the covering itself.
 Moreover, the hollow plastic structure maintains the required sturdiness
 properties.
 Moreover, the use of monoblocks for manufacturing of the elements of the
 covering structure according to the invention advantageously hallows to
 reduce the number of parts to be mounted during assembly; as a result, a
 faster assembly and lower manufacturing cost are obtained.
 Moreover, moulding production of the whole covering structure allows a
 higher manufacturing precision and consequent improved quality.
 Furthermore, the hinging system for folding the covering structure is
 advantageously moulded in the same monoblocks used for manufacturing the
 elements that form the covering structure.
 Application of a thermoplastic direct injection moulding technique is
 particularly advantageous with respect to other manufacturing technologies
 for producing hollow elements from plastic material, such as blowing,
 since the elements forming the covering structure are not only hollow
 moulded, but also have variable thickness.
 It is obvious that many changes are possible for the man skilled in the art
 to the covering structure for a two-wheeler vehicle and/or manufacturing
 method of a covering structure described above by way of example, without
 departing from the novelty spirit of the innovative idea, and it is also
 clear that in its practical actuation the components may be different in
 form and size from the ones described and be replaced with technical
 equivalent elements.
 For instance, other plastic materials can be used for manufacturing the
 covering structure, provided they are suitable for thermoplastic moulding
 processes.