Wheel mounting device, particularly for skates

Abstract: A device for mounting wheels and for compensating plays, particularly usable in skates including a shoe associated with a supporting frame for one or more possibly mutually aligned wheels composed of a central hub (5) with which an annular element (7), acting as tire, is associated. The device is constituted by a pivot (9) which is associatable with the hub and the frame and has, at its ends, an engagement-disengagement lever (13) and a play compensation member.

Description: The present invention relates to a wheel mounting device in a skate, and also for compensating clearances. Conventional roller skates are usually constituted by a shoe having a sole associated with a substantially U-shaped frame; one or more possibly mutually aligned wheels are pivoted between the wings of the frame by means of an adapted pivot. A problem that arises in these conventional skates is the fact that rapid wear of the wheels entails their frequent replacement. Such replacement is not always easy because it requires particular tools such as for example screwdrivers or wrenches. As a solution to this drawback, devices have been designed which allow the quick disengagement and reengagement of the wheels without requiring the user to use particular tools. However, due to frequent replacements, as well as to the presence of possible machining tolerances, in conventional skates there is always a certain play or clearance between the hub of the wheel, the frame and the pivot, and this increases the wear of the various parts due to the consequent friction, which also limits the maximum speed attainable with the skate. EP-A-503 877 discloses a wheel mounting device in a skate as defined in the preamble of the appended claim 1. The aim of the present invention is to eliminate the described technical problems, solving the drawbacks described above in conventional skates by providing a device which allows rapid and optimum compensation of clearances between the wheels and the components of the skate. Within the scope of the above aim, an important object is to provide a device which allows to compensate clearances even when the wear of the various components varies. Another important object is to provide a device in which clearances can be compensated rapidly and easily by the user. Another important object is to provide a device which is structurally simple and easy to industrialize. Another object is to provide a device which associates with the preceding characteristics that of being reliable and safe in use and has low manufacturing costs. This aim, these objects and others which will become apparent hereinafter are achieved by a wheel mounting device in a skate as defined in the appended claims. Further characteristics and advantages of the invention will become apparent from the detailed description of a particular but not exclusive embodiment, illustrated only by way of non-limitative example in the accompanying drawings, wherein: figure 1 is a cross section view of the device, taken at the supporting frame of a skate with aligned wheels; figure 2 is a partially cutout perspective view of the clearance compensating means of the device; figure 3 is a partially sectional view of the pivot of the device; figure 4 is a side view of one end of the pivot of figure 3; figure 5 is a perspective bottom view of the end of the pivot shown in figure 4; figure 6 is a sectional view of a different embodiment of the means which allow to select a given angular position. DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the above figures, the reference numeral 1 designates the frame of a skate which has a substantially U-shaped cross-section in which the wings 2a and 2b are directed toward the ground 3. The reference numeral 4 designates a wheel which comprises a central hub 5 provided with bearings 6 and with which a substantially annular element 7, acting as tire, is associated. The device, generally designated by the reference numeral 8, comprises a pivot 9 which is axially associated with the central hub 5 and at adapted holes 10a and 10b formed on the wings 2a and 2b of the frame 1. Advantageously, an adapted pair of spacers, designated by the reference numerals 11a and 11b, is located between the central hub 5 and the wings 2a and 2b. The spacers can be independent components or can be obtained monolithically from the hub or can be a combination of the two. At a first end 12, the pivot 9 has means for temporary locking to the frame 1. This means is constituted, for example, by a lever 13 which is pivoted transversely to the pivot 9 and has a lateral surface 14. Adapted cams, arranged approximately at 90° to each other, are formed on the surface 14. The cams interact with the end of a cylinder 15 which can slide axially within an adapted seat 16 formed in said pivot 9 in contrast with an elastically deformable element such as a spring 17. The rotation of the lever 13 thus allows it to arrange itself in two distinct and stable positions: one transversely to said pivot and one axially to it, with the consequent possibility of quick extraction from the hub 5; the described means thus allow quick engagement and disengagement of the wheel 4. As an alternative, it is possible to provide a conventional solution with a temporary locking bolt. The pivot 9 has a second substantially T-shaped end 18 on the head 19 whereof there are a seat 20 for an actuation element, for example an Allen wrench, and, at the surface which faces the wings of the frame, a first inclined plane 21 forming a helical surface. A guiding slot 22 for a lug 23 is formed at said first inclined plane 21. The lug protrudes from a second inclined plane 24 which forms a helical surface which is complementary to the first inclined plane 21 and is formed on the lateral surface of one of the wings 2a and 2b coaxially to the holes 10a and 10b. Placement of the lug 23 within the slot 22 allows to guide and provides a stroke limit for the rotation of the head 19 of the pivot 9 in one direction or the other with respect to the wings of the frame through approximately 360°. This rotation entails an axial movement of the pivot once the lever 13 has been rotated until it is arranged transversely to the pivot 9 and the wheel has thus been associated with the frame 1, with consequent clearance compensation. The device also comprises a means suitable to allow to select the angular position of the head 19 with respect to the second inclined plane 24. This means is constituted by at least one protrusion 25 which protrudes from the second inclined plane 24 and fits selectively within one of a plurality of second complementarily shaped seats 26 formed on the lateral surface of the first inclined plane 21. This accordingly allows to keep the head of the pivot in the optimum position, so as to keep the set clearance constant. As an alternative, the means that allows to select the angular position of the head is constituted by a protrusion or ball 25 which is accommodated in an adapted seat formed on the second inclined plane 24 and slightly protrudes from it in contrast with an elastically deformable means 27. It has thus been observed that the device according to the invention has achieved the above mentioned aim and objects, a device particularly for roller skates having been obtained which allows rapid and optimum compensation of plays between the wheels and the components of the skate. The device furthermore allows to compensate clearances even as the wear of the various components varies. Clearance compensation furthermore occurs very rapidly, easily and comfortably for the user. The device is naturally susceptible to numerous modifications and variations, all of which are within the scope of the same inventive concept. The materials and the dimensions which constitute the individual components of the device may naturally be the most pertinent according to the specific requirements.

Claims: Wheel mounting device in a skate which comprises a shoe associated with a supporting frame (1) for a plurality of wheels composed of a central hub (5) with which a substantially annular element (7) is associated, said annular element acting as tire the device comprising a pivot (9) which is associatable with said hub and said frame with the interposition of at least one spacer (11a,11b), said pivot being provided with means (13) for the temporary locking of said pivot to said frame and means (21,24) for compensating clearances, characterised in that said means (13) for temporary locking are provided at a first end (12) of the pivot (9) and said means (21,24) for compensating clearances are provided at a second end (18) of the pivot (9). Device according to claim 1, characterized in that said pivot has a second essentially T-shaped end (18) on the head (19) whereof there are a seat (20) for an actuation element such as an Allen wrench and, at the surface which faces said wings of said frame, a first inclined plane (21) which forms a helical surface. Device according to claim 2, characterized in that a guiding slot (22) for a lug (23) is formed at said first inclined plane (21), said lug protruding from a second inclined plane (24) which forms a helical surface which is complementary to said first inclined plane, said second inclined plane being formed on the lateral surface of at least one of the wings (2a,2b) coaxially to said holes. Device according to claim 3, characterized in that the position of said lug (23) within said slot (22) allows to guide and provide a stroke limit for the rotation, through approximately 360°, in one direction or the other, of said head of said pivot with respect to said wings of said frame. Device according to claim 4, characterized in that said rotation entails, once said temporary locking means have been activated, an axial movement of said pivot with consequent clearance compensation. Device according to claim 4, characterized in that it comprises means which allow to select the angular position of said head with respect to said second inclined plane, said means being constituted by at least one protrusion (25) protruding from said second inclined plane (24), said protrusion arranging itself selectively within one of a plurality of second complementarily shaped seats (26) formed on the lateral surface of said first inclined plane. Device according to claim 1, comprising a frame having a substantially U-shaped cross-section having wings (2a,2b) directed toward the ground, characterized in that said pivot (9), which is axially associable with said central hub at adapted holes (10a,10b) formed on the wings of said frame and with the interposition of at least one adapted spacer (11a,11b), has, at a first end, means (13) for temporary locking to said frame which can be activated in contrast with an elastically deformable element (17). Device according to one or more of the preceding claims, characterized in that said means which allow to select the angular position of said head is constituted by a protrusion or ball (25) which is accommodated in an adapted seat and protrudes slightly from it in contrast with an elastically deformable member (27).

Inventors: POZZOBON ALESSANDRO, POZZOBON, ALESSANDRO
Applicants: NORDICA SPA, NORDICA S.P.A.
Application year: 1993
Main classification: A63C17
IPC codes: A63C17