WO1998018357A1

WO1998018357A1 - Ski boot

Info

Publication number: WO1998018357A1
Application number: PCT/AT1997/000229
Authority: WO
Inventors: Gerhard Trinkaus; Josef LÖCKER
Original assignee: Atomic Austria Gmbh
Priority date: 1996-10-25
Filing date: 1997-10-27
Publication date: 1998-05-07
Also published as: AT1700U1

Abstract

This invention concerns a ski boot with an injection-molded sole (2) of plastic attached to a shell (1). The sole (2) has at least one cavity (6, 7) sealed off from outside to increase the thickness (H) and thus the surface of the base.

Description

Ski boot

The invention relates to a ski boot with a plastic-molded sole part on a shell part, the sole part having at least one cavity closed to the outside.

In alpine skiing, especially in racing, when using strongly tailored skis and when using the so-called carving technique, there is a desire to provide a skier with a relatively large footprint relative to the top of the ski. This enables larger upturn angles when cornering (for more extreme inclinations of the lower leg) and prevents falls when cornering - triggered by a streak of the ski boots in the snow or on the ice. To increase the footprint, the skis in the binding area were previously provided with a plate or a platform or with intermediate layers between the top of the ski and the binding, but this is only permitted for a limited height.

Another possibility for increasing the footprint, as is the starting point for the invention, would be to thicken the sole (including the heel) of the ski boot. In the case of a simple thickening of the sole, however, problems arise during production using the injection molding process, in particular in the transition regions between the thin shell and the thick sole, since there are cracks at these points during molding or cooling due to the different rates of cooling and hardening can come. In addition, the increased weight of the ski boot due to a thickened, full sole has a very disadvantageous effect.

From EP 413 135 AI a ski boot of the type mentioned is known, the heel of which has cavities which are closed off by a ribbed sole covering and are obviously only intended for the purpose of saving material and weight.

A similar ski boot is known from WO 92/01397, support elements in the form of spacer pins being provided in the cavity of the heel for fastening a base plate by means of screws which are inserted into the spacer pins. are screwed. However, this involves the attachment of a damping elastic element between the base plate and the underside of the shell at the heel, which - like the heel of the ski boot according to EP 413 135 AI - has a conventional height.

It is therefore an object of the invention to provide a ski boot as stated at the beginning, in which, in order to increase the footprint, the sole is higher than in a conventional ski boot, without this resulting in a significant increase in weight, in manufacturing problems or in an impairment of the strength properties of the ski boot comes.

The ski boot according to the invention of the type mentioned at the outset is characterized in that the sole part has a front cavity and a rear cavity and at least one last running in the longitudinal direction of the shoe is provided in between. This design enables an increase in the distance between the top and bottom of the sole part, i.e. an increase in footprint, avoiding manufacturing difficulties (by injection molding) as well as undesirable increases in weight through the cavity or cavities. In addition, a particularly high strength or rigidity is achieved with corresponding stability when held in a ski binding.

It is also advantageous here if an opening is provided between the front and the rear cavity, which opening is covered on the upper side of the sole part, it also being advantageous if the insert part is plate-shaped. The insert part can be used for additional reinforcement of the sole as a whole.

For attaching the insert part to achieve a "composite" sole, it is particularly advantageous if the insert part is inserted and fixed in a recess in the sole part running around the upper edge of the opening. So that the insert part can fulfill its stiffening function well, it is also advantageous if the insert part consists of a hard plastic material, preferably polycarbonate. The rest of the sole and the shoe shell itself (lower Bowl; Shaft), on the other hand, can be produced in a conventional manner, for example from polyurethane material.

For additional stiffening and to facilitate walking with the ski boot, it is also advantageous if the opening is laterally closed by two edge strips of the sole part and delimited by transverse webs of the sole part to the front and rear cavity.

In order to increase the slip resistance of the ski boot when walking in the snow, it is expedient if the edges of the sole part of the sole are at least partially provided with transverse ribs. It is also advantageous here if transverse ribs are provided on at least one of the crosspieces, preferably on the crosspiece that adjoins the front cavity.

Furthermore, it is also advantageous if the transverse web adjoining the rear cavity is designed to extend obliquely upwards; this can prevent snow from sticking to this area.

In order to counteract any inward pressing of the base plate (s), it is also advantageous if the cavities are formed by recesses extending from the underside of the sole part, which are each covered by a base plate on the underside of the sole part, and if in at least one of the Cavities at least one support element for the base plate (s) is arranged. The support element can also be used to fix the base plate if the support element is formed by an integrally formed spacer pin on which the (respective) base plate, e.g. by means of screws. This also enables simple and uncomplicated production of the ski boot, since the demolding presents no difficulties during the injection molding process due to the absence of closed cavities and undercuts.

For the desired increase in footprint, it has proven particularly favorable if the distance between the top and the bottom of the sole part or the sole is greater than 30 mm, in particular at least 35 mm.

The invention is explained in more detail below on the basis of preferred exemplary embodiments with reference to the drawing. Show it: Fig.l the sole area including part of the lower shell of a ski boot in longitudinal section; and

2 shows a bottom view of the sole area according to FIG. 1, the shell part of the ski boot having been omitted.

In Fig. 1, 1 generally denotes a shell part (e.g. a lower shell to which a shaft (not shown) is connected) of a ski boot, and 2 the sole part thereof. The distance H between the upper side 3 and the lower side 4 of the sole part or generally the sole 2 (without an insole 5 or the like which is generally present in the interior of the shoe) is greater than the corresponding distance in a conventional ski shoe, in order thereby to increase the edging to enable in skiing (racing). The sole has a sole part with a front cavity 6 in the toe area and a sole part with a rear cavity 7 in the heel area, these cavities 6, 7 being closed. In between is an area with a recess 8 that is open at the bottom. The front cavity 6 and the rear cavity 7 are each formed by a recess 9, 10 in the sole 2, each of which is covered on the underside of the sole 2 by a base plate 11, 12 is; the depression 8 in the central region of the sole 2 is formed by an opening in the sole 2, which is covered by a plate-shaped insert part, hereinafter referred to as insert plate 13, in the upper part of the sole 2.

To support and fix the base plates 11, 12 to the sole parts defining the cavities 6, 7, support elements 14 in the form of spacer pins 15 with threaded bores 16 are provided in the recesses 9, 10, which are connected to the sole 2 or the respective sole parts in the toe. or heel area are integrally formed and serve to receive fastening screws 17 for the base plates 11, 12. For the base plate 11, which covers the front cavity 6 downwards, for example four spacer pins 15 are provided, whereas the base plate 13, which covers the rear, slightly smaller cavity 7 downwards, e.g. only two spacer pins 15 are provided, cf. Fig. 2.

The insert plate 13, which covers the depression or opening 8 upwards, is in a recess 18 of the sole 2 which runs around the upper edge of the opening 8 inserted and consists of a comparatively hard plastic material, preferably polycarbonate. For the firm connection of the insert plate 13 to the sole 2, for example, the procedure is such that the insert plate 13, together with the sole 2, is inserted into an injection mold provided for this purpose, for example by injection molding from polyurethane, and is integrally injected with it, so that a firm and permanent connection of the sole 2 with the insert plate 13 is obtained.

The central recess 8 is laterally, on the longitudinal edges of the sole, limited by last 19 of the sole 2, which stiffen the sole 2, and which are provided with coarse rounded ribs 20 over part of their length in order to ensure the slip resistance of the ski boot when walking in Increase snow. Crosspieces 21 and 22 of the sole 2 delimit the central cavity 8 from the front cavity 6 and from the rear cavity 7, the front crosspiece 21 also being provided with ribs 23. The transverse web 22 adjoining the rear cavity 7 extends obliquely upwards, as can be seen from FIG. 1, in order to prevent snow from sticking to the ski boot as far as possible. In order to further increase the slip resistance of the ski boot, the base plates 11, 12 are also provided on the outside in whole or in part with serrated ribs 24, which are finer in comparison to the coarse ribs 20 of the lasts 19 in order to also hold on a normal dry surface Going to offer.

The ribs 20, 23 and 24 also counteract the adherence of snow and ice.

From Fig.l a front projection 25 and a rear projection 26 on the sole 2 or lower shell 1 can also be seen, these projections 25, 26 are provided at a suitable height for working with conventional bindings, not shown.

In a modification of the embodiment shown, it is also possible to provide more than two cavities distributed over the sole 2. The support elements can also be designed instead of in the form of spacer pins as dividing walls which subdivide the cavities into individual partial chambers and thus result in a particularly rigid structure. It is important that the walls delimiting the cavities, for example 6, 7, and the support elements have a thickness that is not too different, in particular comparable to the thickness of the shell 1, in order to ensure solidification and solidification of the respective plastic material areas as uniformly as possible over time. This enables a sole that is approx. 15 mm or 20 mm thicker than conventional ski boots, ie a corresponding increase in footprint by, for example, 15 mm or 20 mm, without cracking during spraying; in addition, the cavities 6, 7 prevent an increase in weight otherwise associated with the thickening of the sole. The height H of the sole 2 (see FIG. 1) can be, for example, 30 mm, preferably 35 mm.

It is also possible to place the lasts 19 offset to the inside, towards the central plane of the shoe, instead of on the longitudinal edges on the sole 2.

Claims

Claims:

1. Ski boot with a plastic injection molded sole part (2) on a shell part (1), wherein the sole part (2) has at least one cavity (6, 7) closed to the outside, characterized in that the sole part (2) has a front cavity (6) and has a rear cavity (7) and between them at least one last (19) extending in the longitudinal direction of the shoe is provided.

2. Ski boot according to claim 1, characterized in that between the front and the rear cavity (6, 7) an opening (8) is provided, which is covered on the top (3) of the sole part (2) by an insert part (13) is.

3. Ski boot according to claim 2, characterized in that the insert part (13) is plate-shaped.

4. Ski boot according to claim 2, characterized in that the insert part (12) in a around the upper edge of the opening (8) extending recess (18) of the sole part (2) is inserted and fixed.

5. Ski boot according to claim 3 or 4, characterized in that the plate-shaped insert part (13) made of a hard plastic material, e.g. Polycarbonate.

6. Ski boot according to one of claims 2 to 5, characterized in that the opening (8) by two edge strips (19) of the sole part (2) laterally and through crossbars (21, 22) of the sole part (2) to the front and rear cavity (6, 7) is delimited.

7. Ski boot according to claim 6, characterized in that the marginal strips (19) of the sole part (2) are at least partially provided with transverse ribs (20).

8. Ski boot according to claim 6 or 7, characterized in that at least on one of the transverse webs (21, 22), for example on transverse ribs (23) are provided, the transverse web (21) bordering the front cavity.

9. Ski boot according to one of claims 6 to 8, characterized in that the transverse web (22) adjoining the rear cavity (7) is designed to extend obliquely upwards.

10. Ski boot according to one of claims 1 to 9, characterized in that the cavities (5, 7) by recesses (9, 10) extending from the underside (4) of the sole part (2) are formed, which on the underside ( 4) of the sole part (2) are each covered by a base plate (11, 12), and that at least one support element (14) for the base plate (s) (11, 12) is arranged in at least one of the cavities (6, 7) .

11. Ski boot according to claim 10, characterized in that the support element (14) is formed by an integrally formed spacer pin (15) on which the (respective) base plate (11, 12), e.g. by means of screws.

12. Ski boot according to claims 1 to 11, characterized in that the distance (H) between the top (3) and the bottom (4) of the sole part (2) is greater than 30 mm, e.g. is at least 35 mm.