INLINE SKATE HAVING A FRAME AND METHOD FOR THE PRODUCTION THEREOF

Abstract: An in-line roller skate provided with several wheels in a line one after the other. The roller skate has a shoe and a frame for fixing of the wheels, which frame comprises an extruded section, which extends in the longitudinal direction on the bottom side of the shoe and has two substantially parallel side rails, between which the wheels are fixed. Each side rail of the frame has one or more internal chambers, formed during the extrusion of the section and extending substantially along the length of the side rail. Each side rail, in the case of at least one internal chamber thereof, preferably forms a closed peripheral wall around the chamber along the entire length of that chamber, which produces great stiffness of the frame.

Description: Inline skate having a frame and method for the production thereof . The present invention relates to an in-line roller skate according to the preamble of claim 1, and also to a method for manufacturing an in-line roller skate according to the preamble of claim 5. Such an in-line roller skate and such a method are known from NL-A-9000384. In the case of this known in-line roller skate the frame is manufactured starting from an extruded aluminium section having three transverse members between the side rails. In this case the top transverse member forms the support for the heel of the shoe, the middle transverse member forms the support for the toe of the shoe, and the bottom transverse member forms connecting bridges extending between the wheels. For the manufacture of the final frame, which is preferably made as light and as rigid as possible, a large part of each of the transverse members is removed, for example by milling or other operations. In the case of the known in-line roller skate the stiffness of the frame is not yet ideal. Furthermore, a very large amount of the material of the transverse members must be removed in order to obtain the final frame. This makes the production costs undesirably high. The present invention aims to solve the abovementioned problem. A further object of the present invention is to provide an in-line roller skate that is light and rigid, in particular that has a considerable torsional and/or bending stiffness. In addition, the invention aims to provide a suitable production method. The present invention provides an in-line roller skate according to the preamble of claim 1, which is characterized in that each side rail of the frame has one or more internal chambers, formed during the extrusion of the section and extending substantially along the length of the side rail. Tne invention therefore proposes not making the side rails with a solid cross section, as in the case of the known roller skate, but with internal chambers, so that a double- walled or multiple-walled construction of each side rail is obtained. During the extrusion of the section, preferably from light metal, by means of a suitable extrusion die, one or more of such axial chambers can be formed in a relatively simple manner into a side rail. Each side rail, in the case of at least one internal chamber thereof, preferably forms a closed peripheral wall around the chamber along the entire length of that chamber. The side rail then comprises, as it were, a tube extending along the length thereof and free from openings in the periphery. Such a tube has a great stiffness and is light. In a possible embodiment, each side rail is provided with one or more holes m a bottom edge strip thereof, for wheel shafts belonging to the wheels, the side rail being of a solid construction in the region of the bottom edge strip. In an advantageous embodiment, the side rails are connected only by transverse elements obtained by working two transverse members formed between the side rails during the extrusion. In this case the top transverse member is then preferably subjected to a finishing operation, in order to form the heel support for the shoe, and the bottom transverse member is subjected to a finishing operation, in order to form the support for the toe of the shoe. The presence of one or more chambers extending in the longitudinal direction m each side rail means that the stiffness thereof increases to such an extent that, compared with the known in-line roller skate mentioned earlier, it is possible to omit a third transverse member during the extrusion. This produces a considerable saving in the finishing operation of the extruded section. The present invention also provides a frame for an in ¬ line roller skate according to the invention, and also a method for manufacturing such a frame. The invention will be explained in greater detail below with reference to the drawing, in which: Fig. 1 shows a view in perspective of a frame for an inline roller skate according to the invention; Fig. 2 shows the frame of Figure 1 in front view; Fig. 3 shows the frame of Figure 1 in side view; and Fig. 4 shows the frame of Figure 1 m top view. Figures 1-4 show a frame 1 of an in-line roller skate, which is not shown in any further detail. The frame 1 is equipped for fixing wheels - in this example five - in a line one after the other. The roller skate further comprises a shoe (not shown) , the frame 1 being mounted in the longitudinal direction under the shoe, possibly by means of a hinged connection. The frame 1 is manufactured by first extruding an elongated section, for example made of aluminium, an aluminium alloy or another suitable material. The basic shape of the extruded section can be seen in Figure 2. The section has two substantially parallel side rails 3, 4 situated at a distance from each other, and also a top transverse member 5 and a bottom transverse member 6. The side rails 3, 4 project under the bottom transverse member 6. The extruded section is subjected to one or more material-removing finishing operations, in order to obtain the frame 1 shown in Figures 1-4. In these operations a support 7 for the heel of the shoe is made from the top transverse member 5, the part of the bottom transverse member 6 situated below it forming an additional transverse member 8 in said heel support 7. In addition, a support 9 for the toe of the shoe is formed from the bottom transverse member 6. In particular in Figure 2, it can be seen clearly that the side rails 3, 4 are not made with a solid cross section, but are each provided with an internal chamber 10, 11 extending substantially along the entire length of the side rail 3, 4. The chambers 10, 11 form a cavity in the side rail with a greater height than the width of the cavity. The chambers 10, 11 provide, as it were, a double-walled construction of the side rails 3, 4. For the stiffness of the frame 1, in particular the torsional stiffness, it is very advantageous for each side rail 3, 4 to form a closed peripheral wall in that chamber 10, 11 along the entire length thereof. A tubular part with closed peripheral wall that has great stiffness and is low in weight can thus be seen in each side rail 3, 4. Apart from the axial chambers 10, 11, several transverse openings, for example openings 13, 14, are also formed in the side rails 3, 4, at the position of the heel support and the toe support. Said transverse openings 13, 14 are not in communication with the chambers 10, 11, in order to ensure in this way that the peripheral wall around said chambers 10, 11 are left intact. Each side rail 3, 4 is further provided with one or more holes 17, 18 in a bottom edge strip 15, 16 thereof, for wheel shafts belonging to the wheels. The side rails 3, 4 are made of a solid construction in the region of the appropriate bottom edge strip 17, 18, so that a stable base is provided for fixing the wheel shafts thereon. In a variant, one or both axial ends of the chambers 10, 11 are sealed off. The seals can be loose stops that prevent dirt and the like from entering the chambers. On the other hand, ends of the chambers can also be sealed off by a stop immovably connected to the side rail 3, 4, for example, a welded stop, so that the shut-off stop contributes to the stability of the side rail 3, 4. It will be clear that, instead of a single chamber 10, 11 in each side rail 3, 4, several chambers can also be formed, for example, several chambers one above the other, separated by transverse walls. Owing to the great stiffness of the side rails 3, 4, it is in principle not necessary to go on to fit transverse connections between the side rails at a level below the toe support, which considerably reduces production costs compared with the known frames, which are made from an extruded (metal) section. Of course, the idea of the invention can also be applied in the case of frames with three tiers of transverse members between the side rails or a transverse connection designed in a totally different way between the side rails.

Claims: C L A I M S 1. In-line roller skate provided with several wheels in a line one after the other, which roller skate has a shoe and also a frame (1) for fixing of the wheels, which frame comprises an extruded section, which extends in the longitudinal direction on the bottom side of the shoe and has two substantially parallel side rails (3, 4), between which the wheels are fixed, characterized in that each side rail (3, 4) of the frame has one or more internal chambers (10, 11) formed during extrusion of the section and extending substantially along the length of the side rail. 2. In-line roller skate according to claim 1, in which each side rail (3, 4) in the case of at least one internal chamber (10, 11) thereof forms a closed peripheral wall around the chamber along the entire length of that chamber. 3. In-line roller skate according to claim 1 or 2, in which each side rail (3, 4) is provided with one or more holes (17, 18) in a bottom edge strip (15, 16) thereof, for wheel shafts belonging to the wheels, and in which the side rail is made of a solid construction in the region of the bottom edge strip. 4. Frame (1) for an in-line roller skate, which frame comprises an elongated extruded section with two substantially parallel side rails (3, 4) , and one or more transverse members between the side rails, which frame has a top side that is equipped for the fitting of a shoe, the side rails (3, 4) being equipped to fix several wheels in a line one after the other between the side rails, characterized in that each side rail (3, 4) of the frame has one or more internal chambers (10, 11) formed during the extrusion of the section and extending substantially along the length of the side rail. 5. Method for manufacturing a frame (1) for fixing the wheels of an in-line roller skate having several wheels, in which method an elongated section is extruded, which section has two parallel side rails (3, 4) and one or more transverse members (5, 6), which connect the side rails to each other, which section is subsequently subjected to one or more machining finishing operations, characterized in that during the extrusion of the metal section one or more internal chambers (10, 11) extending along the length of the metal section aie formed in each side rail (3, 4) . 6. Method according to claim 5, in which during the machining finishing operation of the extruded metal section the peripheral wall formed by the metal of the side rail (3, 4) remains closed around at least one of the internal chambers (10, 11) in each side rail. 7. Method according to claim 5 or 6, in which during the extrusion of the metal section a bottom edge strip (15, 16) on each side rail is made of a solid construction, in which edge strip the holes for the wheel shafts of the wheels are subsequently fitted.

Inventors: HOL DIEDERIK HENDRIK ALEWIJN, HOL, DIEDERIK, HENDRIK, ALEWIJN
Applicants: HOL DIEDERIK HENDRIK ALEWIJN, SPORTS INLINE INTERNAT B V, HOL, DIEDERIK, HENDRIK, ALEWIJN, SPORTS INLINE INTERNATIONAL B.V.
Application year: 2000
Main classification: A63C17
IPC codes: A63C17