Abstract
The invention regards a process for manufacturing a bicycle saddle, which provides a central through channel as well as a hull with a through hole (4′); a polyurethane layer and a liner.
By means of this process it is possible to make sure that, unlike the saddles of the state of the art, said central through channel is completely devoid of the edge present around the aforementioned, with significant advantages from both an aesthetic and functional point of view for the user.
Claims
1-8. (canceled)
9. PROCESS FOR MANUFACTURING A BICYCLE SADDLE, which provides a central through channel and which has: a hull with a through hole at the central through channel of the saddle; a polyurethane layer as a padding element; a liner adapted to cover the polyurethane layer, said process providing for the following steps: arranging the liner on the hollow surface of a mould; creating a vacuum between the liner and said hollow surface to allow a perfect adhesion between the aforesaid ones; pouring polyurethane into said hollow surface, previously covered by the liner; positioning the hull on the surface of a counter mould; mutual approaching and closing of the mould and counter mould and consequent positioning of the counter mould at the hollow surface of the mould; expansion of the polyurethane, which completely fills the space between the liner and the hull; mutual moving away of mould and counter mould; extraction of the set of hull, polyurethane and liner of the mould, wherein said liner is subjected to a previous processing step so as to present a cap-like structure at the region in which the channel of the saddle will be present once formed and in that the step of arranging the liner presenting the cap-like structure on the mould takes place taking care to arrange said cap-like structure on a projection, specifically provided in said mould, adapted to engage with a concavity specifically provided for in said counter-mould; said process wherein, at the end of all the previous steps, the portion of the cap-like structure which covered the projection and which protrudes above the edges of the hole of the hull is mechanically removed and said liner is made by the following steps: creating a hole on a semi-finished liner, at the region where the channel of the saddle will be present, once formed; welding of a cap-like structure to the semi-finished liner at the hole, so that the open edges of the cap-like structure coincide substantially with the edges of the aforesaid hole.
10. PROCESS, according to claim 9, wherein said cap-like structure is obtained by means of a previous step of mutual welding of two elements, of a length substantially similar to that of the hole.
11. PROCESS, according to claim 10, wherein it provides for: inserting the cap-like structure into a through hole present in an electrode, substantially shaped like the hole present on the liner; inserting the elements within the electrode and folding a portion of the open base of the cap-like structure and placing the aforesaid one against the external walls of the electrode; arranging the assembly of electrode and the cap-like structure on the edges of the hole present in the semi-finished liner; realizing a welding to cause the adhesion by mutual fusion between the portion of the cap-like structure in contact with the semi-finished liner and the same liner; removing the electrode; cutting the portion of the cap-like structure which was placed against the external surface of the electrode, so as to facilitate the removal of the portion of the cap-like structure which was placed against the external surface of the electrode.
12. PROCESS, according to claim 11, wherein a high frequency welding is realized by means of the electrode to cause the adhesion by mutual fusion between the portion of the cap-like structure in contact with the semi-finished liner and the same liner.
13. PROCESS, according to claim 11, wherein it provides a welding with cladding to cause the adhesion by mutual fusion between the portion of the cap-like structure in contact with the semi-finished liner and the same liner.
14. PROCESS, according to claim 11, wherein the two elements adapted to form the cap-like structure are subjected to a micro-drilling step along the edge of the area intended to be folded on the external wall of the electrode.
15. BICYCLE SADDLE, according to claim 11, wherein the liner is positioned on a work surface, so as to completely stretch it, as well as blocked by a locking surface having a hole in the region corresponding to the hole of the semi-finished liner.
16. BICYCLE SADDLE, wherein it is made by means of the process according to claim 9.
Description
[0030] These and other feature of the invention will now be described herein in detail, in some particular embodiments thereof, with reference to the accompanying drawings, wherein:
[0031] FIGS. 1 and 2 show, respectively, a plan view from above and a perspective view of a saddle manufactured according to the process referred to in the invention;
[0032] FIG. 3 shows a cross-sectional view of said saddle, carried out according to line III-III of FIG. 1;
[0033] FIG. 4 shows, in a cross-sectional view the mould and the counter mould used during the process referred to in the invention, as well as other elements making up the saddle and also the liner and the hull, which will be further elements of the saddle referred to in the invention;
[0034] FIGS. 5, 6 and 7 show a cross-sectional view of the mould used in the process referred to in the invention, in three different steps, in which the liner used for manufacturing the saddle referred to in the invention is also shown;
[0035] FIG. 8 shows a cross-sectional view of the mould used in the process referred to in the invention in the step when the hull is placed on said mould;
[0036] FIGS. 9, 10 and 11 show three different steps of the process referred to in the invention, in which the mould, the counter mould, the hull, the liner and the polyurethane present in the saddle referred to in the invention are shown;
[0037] FIG. 12 shows a cross-sectional view of the saddle obtained by means of the process referred to in the invention, in which the step of cutting various portions to be eliminated for the complete finishing of the saddle is schematically shown;
[0038] FIG. 13 shows a perspective view of a saddle with a central channel belonging to the state of the are;
[0039] FIG. 14 shows a cross-sectional view of the aforesaid one, carried out according to line XIV-XIV of FIG. 13;
[0040] FIG. 15 shows an overall perspective view of the semi-finished liner used in the process referred to in the invention for manufacturing the saddle referred to in the invention, in one of its interim steps;
[0041] FIG. 16 shows two elements that will constitute the cap that will be used for the completion of the saddle referred to in the invention;
[0042] FIGS. 17 and 18 show, respectively, an overall perspective view and a frontal view of said cap;
[0043] FIG. 19 shows an overall perspective view of an electrode used in the process referred to in the invention;
[0044] FIG. 20 shows an overall perspective view of said electrode in the step of folding a portion of the open base of the cap-like structure;
[0045] FIG. 21 shows an overall perspective view of how said electrode is applied to weld said cap to the liner inside a saddle referred to in the invention;
[0046] FIG. 22 shows a cross-sectional view of what is shown in FIG. 20, carried out according to lines XXI-XXI of said figure;
[0047] FIG. 23 shows an overall perspective view of the set made up of the liner and cap already welded thereto;
[0048] FIG. 24 shows a cross-sectional view of said set, carried out according to line XXIV-XXIV of FIG. 23, in which the excesses to be eliminated and that are formed during the process referred to in the invention are shown;
[0049] FIG. 25 shows an overall perspective view of a liner used to manufacture a saddle with a central channel according to the state of the art;
[0050] FIGS. 26 to 34 show views of various elements involved in the process for manufacturing a saddle with a central channel according to the state of the art, which correspond, respectively, to the views in FIGS. 4 to 12, relative to the process referred to in the invention.
[0051] As can be seen in FIGS. 13 and 14, the state-of-the-art bicycle saddles 101 with a central through channel 102 are substantially composed of a hull 104 provided with a through hole 120 (fig, 26) at the region that will be occupied by the central channel 102, by a polyurethane layer 105 having a padding function and by a liner 103 covering said layer. The liner 103 is usually made of synthetic material but can also be made of animal-derived materials such as leather or fabric.
[0052] The hull 104 is usually made of plastic material, but may also be made of metal, as well as carbon or in any case a material that provides adequate strength and solidity to the saddle.
[0053] Said saddle 101 is usually assembled by a process (FIGS. 26-34) comprising the steps of: [0054] arranging the liner 103 on the hollow surface 108 of a mould 106 (FIG. 27); [0055] creating a vacuum between said liner 103 and said hollow surface 108 (FIG. 28) by suitable means, such as vacuum pumps 109, with pipes 110 connecting them to said hollow surface 108. to allow a perfect adhesion between the aforesaid ones. By vacuum the person skilled in the art means a pressure substantially lower than atmospheric pressure, but still sufficient to allow said perfect adhesion; [0056] pouring polyurethane 105 into the hollow surface 108, previously covered by the liner 103 (FIG. 29); [0057] positioning the hull 104 on the surface of a counter mould 107 (FIG. 30); [0058] mutual approaching and closing of the mould 106 and counter mould 107 and consequent positioning of the counter mould 107 at the hollow surface 108 of the mould 106 (FIG. 31); [0059] expansion of the polyurethane 105, which completely fills the space between the liner 103 and the hull 104 (FIG. 32). As is well known, polyurethane is a very versatile polymer which, in order to be used in the present invention, before being poured into the mould 106 above the liner 103, should be stored in liquid form inside containers, together with a propellant which at this pressure will also be in liquid form. When the mixture leaves the mixing container under pressure, the propellant will change to gaseous form, generating bubbles that will lead to the perceptible expansion of the polyurethane.
[0060] Once the aforementioned steps have been carried out, it will be sufficient to move the mould 106 away from the counter mould 107 to extract the substantially finished saddle (FIG. 3) in which, however, the central through channel is not yet present, since at this step there is still a part of the liner occupying the region intended for the central channel 102. It will therefore be necessary to cut this portion along the edges of the central channel 102 (FIG. 34) and it is precisely this cutting operation that inevitably leads to the creation of a bead 200 along the edge at which the union between the litter and the polyurethane takes place, which therefore remains visible in state-of-the-art saddles.
[0061] This bead 200 does not affect the technical performance of the saddle, but it is an aesthetic imperfection and is unpleasant to the touch, especially considering the fact that, as mentioned above, usually the saddles with, this central channel 102 are sold at a considerable price, being of particularly high quality.
[0062] Moreover, since said bead 200 is at the central channel 102, it might irritate or cause pain is to the sensitive parts of the perineal area of the user, which, due to the configuration of the saddle, are likely to be located in the channel 102 during use.
[0063] Said steps for manufacturing the saddle according to the invention can also be carried out with the mould 106 heated to a temperature of about 50° C.-60° C. by means of known type, schematically indicated with a resistor 117 (FIG. 32), so as to facilitate the perfect adhesions of the liner 103 to the hollow surface 108 of said mould 106.
[0064] In order to eliminate said bead, it is necessary, according to the present invention, to use a liner 3 provided with a cap-like structure 14 (FIG. 23) positioned in the region which will be destined to be occupied by the through channel 2 (FIG. 1). The liner 3 comprising the cap-like structure 14 (FIG. 23) is obtained by the union a semi-finished liner (FIG. 15) in which a hole 12 has been previously created in the region that will be placed at the central channel 2 (FIG. 1). Moreover, also the mould 6 and the counter mould 7 (FIGS. 5-11) will necessarily have respectively a projection 18 and a concavity 28 adapted to engage each other. In particular, the projection 18 and the concavity 28 have dimensions and shapes such as t allow the engagement of the projection 18 within the concavity 28, substantially to size.
[0065] As can be seen from FIGS. 5 to 12, the process according to the invention comprises the steps of [0066] arranging the set of the liner 3, comprising the cap-like structure 14, on the hollow surface 8 of the mould 6, taking care to arrange said cap-like structure 14 on the projection 18 (FIG. 5); [0067] creating a vacuum between the liner 3 and the hollow surface S to allow a perfect adhesion between the aforesaid ones and the consequent perfect adhesion of the cap-like structure 14 to the projection 18, by using, for example, vacuum pumps 9, connected to the hollow surface 8 of the mould 6 by means of ducts 10 (FIG. 6); [0068] pouring polyurethane 5 into the hollow surface 8 previously covered by the liner 3 (FIG. 7); [0069] positioning the hull 4 on the surface of the counter mould 7, taking care to arrange the through hole 4′ of said hull 4 at the concavity 28 of the counter mould 7 (FIG. 8); [0070] mutual approaching and closing of the mould 6 and the counter mould 7 and consequent positioning the counter mould 7 at the hollow surface 8 of the mould 6 (FIG. 9) and reciprocal engagement of said projection 18 covered by the cap-like structure 14 with the concavity 28 of the counter mould 7, so that the cap-like structure 14 covering the projection 18 extends through the through hole 4 (FIGS. 8 and 12) of the hull 4 within said concavity 28 of the counter mould 7. It is implied that the dimensions of the projection 18 are such that they allow that, when the mould is dosed, the cap-like structure extends above the hull 4 (FIG. 5); [0071] expansion of the polyurethane 5 (FIG. 10) until the space between the liner 3 and the hull 4 is completely filled; [0072] mutual moving away of mould 6 and counter mould 7 at the end of the expansion of said polyurethane 5, after waiting for the necessary curing/polymerization time of said polyurethane and extraction of the set of hull 4, polyurethane 5 and liner 3 from mould 6 (FIG. 11); [0073] mechanical removal of the portion 19 of the cap-like structure that covered the is projection 18 and that protrudes with respect to the edges of hole 4′ of hull 4 (FIG. 12). A removal of the lateral excesses 30 of the portions of liner 3 which, located at the interface between mould and counter mould, did not occupy the hollow surface 8 of said mould 6 may also be provided.
[0074] The state of the art does not give any indication on how to industrially manufacture said is liner 3 provided with the cap-like structure 14.
[0075] Advantageously, according to the invention, it can be manufactured by a process comprising the following steps: [0076] creating a hole 12 on a semi-finished liner 3′, at the region where the channel 2 of the saddle 1 will be present, once formed (FIG. 15); [0077] reciprocal welding of two elements 13′, 13″ of substantially similar length to that of the hole 12, so as to form a cap-like structure 14 (FIGS. 16, 17 and 18); [0078] micro-drilling 31 of the elements 13′, 13″ (FIGS. 16 and 17) along the edge of the area which will be intended to be folded over the external wall 16′ of an electrode 16 (FIG. 19); [0079] inserting the elements 13 ′, 13″ within the electrode and folding a portion of the wen base of the cap-like structure 14 and placing the aforesaid one against the external walls of the electrode 16 (FIG. 20); [0080] arranging the assembly of electrode 16 and the cap-like structure 14 on the edges of the hole 12 (visible in FIG. 15) present in the liner; [0081] actuating the electrode 16 which, by means of high frequency currents, will allow is a local fusion that will cause the adhesion between the portion of the cap-like structure 14 in contact with the liner and the same semi-finished liner 3′ (FIGS. 21 and 22); [0082] removing the electrode 16 (FIG. 23); [0083] cutting the portion 15 of the cap-like structure 14 which was placed against the is external surface of the electrode 16 (FIG. 24).
[0084] The adhesion step between the cap-like structure 14 and the semi-finished liner 3′ may also be carried out by performing a welding with cladding.
[0085] This process can be advantageously carried out by using a work surface 40 (FIGS. 21 and 22) on which the semi-finished liner 3′ presenting the hole 12 (visible in FIG. 15) is to be placed, so as to stretch it completely and keep it in a perfectly flat position, and a locking surface 41 (FIG. 21) presenting a hole 41′ (FIG. 21) in the region corresponding to the hole 12 (visible in FIG. 15) of the liner. The electrode 16 in which the cap-like structure 14 has been applied will be inserted in said hole 41′. The locking surface 41 causes the immobilization of the semi-finished liner Y during the welding step of the cap, so as to avoid movements that might compromise the structural quality of the final assembly.
