WO1990013395A1

WO1990013395A1 - Ski edge grinder

Info

Publication number: WO1990013395A1
Application number: PCT/EP1990/000709
Authority: WO
Inventors: Matthias Heinhaus
Original assignee: Matthias Heinhaus
Priority date: 1989-05-06
Filing date: 1990-05-03
Publication date: 1990-11-15
Also published as: DE3914977A1

Abstract

The results given by prior art grinders give deteriorating results even if a new grinding component is used and even after a very short time. To make an improvement here, the invention provides for the rotating grinding components to be arranged at an angle of attack inclined at between 0 and 90°. The grinding component may thus be set with both its front and its rotating peripheral surface on the ski edge (5) to be ground. The grinder is suitable for sharpening the edges of skis.

Description

Grinder for reworking ski edges

The invention relates to a grinding device for reworking ski edges according to the preamble of claim 1.

Ski edge grinding devices are known for example from DE 27 58 531 AI, DE 30 26 776 AI, DE 31 13 492 C2 and DE 33 44 092 AI.

While in the first two publications a cylindrical grinding wheel with an end cutout can be placed on the ski edge that is aligned and sharpened transversely to the tread of the ski, DE 31 13 492 C2 uses a guide angle by means of a drill hole machine and a disc-shaped friction disc that can be clamped in the drill chuck, the steel edge to be sharpened is ground on the peripheral surface of the friction disc. In the last-mentioned DE 33 44 092 AI, a grinding belt guided parallel to the grinding edge is used. In practice, however, it has been shown that all previously known grinding devices for reworking ski edges have so far shown only very unsatisfactory grinding results. Even with new grinding wheels, the grinding result dropped significantly after a very short time.

It is therefore an object of the present invention to provide a grinding device for reworking ski edges, which is of simple construction and which has a grinding result which is significantly improved compared to the prior art. In a preferred embodiment of the invention, the grinding angle should also be adjustable at least in certain angular ranges.

The object is achieved according to the features specified in the characterizing part of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

With the present invention, a ski edge grinding device is created in an amazingly simple manner, which has an equally good, never-before-seen grinding quality over the entire service life of the grinding head. According to the invention, this is achieved in an astonishing way solely by aligning the grinding head at an angle of attack to the grinding edge which is greater than 0 ° and less than 90 °. The angular orientation of the grinding head alone ensures that the steel edge cannot “engrave” consistently on one and the same point on the grinding head, with the result that an uneven overstressing of the

Grinding head the grinding head is worn too much. In contrast, in the grinding device according to the invention, a permanently optimal grinding is guaranteed until the grinding head is completely worked up. The grinding head is automatically sharpened during use and always has the same quality properties as at the beginning. In a preferred embodiment of the invention, the edge grinding is carried out with a grinding head which is placed on the end face at an angular angle of attack on the ski edge to be ground. A pot friction disc is preferably used.

In addition to the angular angle of attack, it is also possible with relatively large grinding wheels or. Cup grinding wheel not only in a plan view of the running surface of the ski, but also in a right-angled sectional view transverse to the longitudinal direction of the ski, the cup-shaped grinding wheel inclined at a further angle to the running surface. This also ensures a vertical tangent grinding perpendicular to the running surface of the ski, although the ski edge to be ground on the grinding head lies in a plane offset from the drive axis of the grinding wheel.

By further selecting this angle of attack, the ski edge can be pre-selectively ground, for example, at an angle of 87 ° to, for example, 92 °.

In an alternative advantageous embodiment of the invention, the grinding device can also work with a grinding wheel effective on the peripheral surface. Here, too, an angular pitch is generally provided between 0 ° and 90 °, in a preferred embodiment the lower angle depending on the thickness of the grinding wheel and the thickness of the steel edge can be selected so that the steel edge is seen in a side view transverse to the drive axis fully cuts and covers the circumferential jacket.

If, in this embodiment too, the edge grinding is to be preset, for example, between 87 ° and 92 ° to the running surface, the grinding wheel only has to be raised or lowered relative to the starting point of the ski edge to be ground, with the result that the running surface of the grinding wheel has the Ski edge no longer on the parallel to the tread of the ski Diameter level, but deviates accordingly from above or below.

Further advantages, details and features of the invention result below from the exemplary embodiments illustrated with the aid of drawings. The individual shows:

Figure 1 is a schematic cross-sectional view transverse to

Longitudinal direction through a ski with the ski edges to be ground and a cup grinding wheel attached according to the invention;

FIG. 2: a top view of the illustration according to FIG. 1;

Figure 3: a section along the line A-B in Figure 2;

Figure 4: a second embodiment with one on the

Peripheral surface of the ski edge to be sharpened, in a cross-sectional representation running to the longitudinal direction of the ski to be ground;

Figure 5 is a side view transverse to Figure 4;

Figure 6 is a plan view of the underside of the ski in the embodiment shown in Figures 4 and 5.

In FIG. 1, a ski 1 with ski edges 5 to be sharpened on the lower tread 3 is shown in schematic cross section transverse to its longitudinal direction. To the

A rotating grinding body 7 is used for grinding, which is designed in the form of a cup wheel as shown in FIGS. 1 to 3. As not shown in more detail, the cup wheel can be attached on its side remote from the ski edge 5 to be ground on the cup base on a drive axis of rotation, not shown, via its central central opening by means of a screw fastening. The central or drive axis 11 of the cup-shaped grinding body 7 is at an angle of attack Oi. aligned by more than 0 ° and less than 90 °. This ensures that the annular end face 13 does not abut the ski edge 5 to be sharpened, which is oriented essentially perpendicular to the tread 3, at the front and rear, but rather only defines in the leading or trailing area of the annular end face 13, during the respective opposite section of the annular end face 13 is lifted off at the level of the ski edge 5 by the existing setting angle. This results in a slightly conical grinding of the annular end face 13, as is shown in particular in FIG. 2. From this illustration it can also be seen that the ski edge 5 to be ground should cut the end face 13, which is ground in a slightly conical shape in a side view, parallel to the running surface 3 of the ski 1 in such a way that the circle formed by the inner wall of the cup-shaped grinding body 7 is at least tangential touched, preferably cut in the manner of a secant.

Since the cup-shaped grinding body 7 generally has a diameter which is many times greater than the material thickness of the ski, the cup-shaped grinding body 7 must be arranged in the relative position to the ski 1 shown in the drawings 1 to 3. A lower position, in which, for example, the central or drive axis 11 would lie in the plane of the tread 3, is of little use, since then the cup-shaped grinding body 7 with the ski stoppers, ski binding parts protruding on the ski side, as a rule. would collide.

In the case of the relative position of the grinding wheel 7 shown in the drawings, the central and drive axis 11 must also be aligned at a further angle of attack ß with respect to the tread 3 in the cross-sectional illustration shown in FIGS. 1 and 3, transversely to the longitudinal direction of the ski 1 that the tangent to the cup-shaped

Grinding body 7 at cutting height on the annular end face 13 corresponds exactly to the cutting angle ", which is usually exactly 90 ° to the tread 3. By correspondingly enlarging or reducing the cutting angle ~, the cutting edge can then, for example, as desired, for example to 87 °, 88 °, 89 °, 90 °, 91 ° or for example 92 ° with respect to the tread, and it is also possible in the case of the device (not shown) with the integrated cup-shaped grinding body 7 to adjust the ski at a slight angle as shown in the illustration according to the angle O relative to the central and drive axis 11. len that the cutting angle is set as desired.

In the embodiment according to FIG. 2, a disc-shaped grinding body 7 is used which, with its cylindrical peripheral surface 15, can be fed onto the ski edge 5 for grinding it. In this case too, the central and drive axis 11 is rotated at an angle of attack ot with respect to the running surface or plane 3, which in principle can likewise differ between 0 ° and 90 °. However, it is preferred to select the lower limit of the angle of attack O such that the entire surface of the grinding surface 15 of the grinding body 7 covers the cutting edge 5 to be sharpened in side view, that is, cuts transversely thereto (FIG. 2).

As can be seen from the drawings, the central or drive axle 11 is in spite of the towards the ^"tread 3 i to the angle of attack. Out tilted Central and drive axle 11 oriented parallel to the longitudinal direction of the ski 1. If the intersection angle ζ exactly 90 ° to the tread 3, the plane of the ski edge intersects, ie in principle the tread 3 at least approximately the central and drive axis 11 in the center of the disk-shaped grinding body 7. If the cutting angle "" is to be enlarged or reduced (for example to 88 ° or 91 °), the disk-shaped grinding body 7, as shown in the arrow illustration 17 in FIG. 5, only has to be adjusted in its position relative to the ski edge 5 in order to produce the overcut or undercut. For the sake of completeness, it should also be mentioned that in the embodiment according to FIG. 4 ff. the peripheral surface 15 of the disc-shaped grinding body 7 takes the form of a single-shell hyperboloid during the grinding process.

Based on the exemplary embodiments, only the principle of the grinding device is explained. In practice, a corresponding grinding body will be provided in a handheld device that is as mobile as possible and has a small installation space, with a bearing surface for resting on the running surface of the ski and with a lateral edge guide on which the grinding and machining approach of the rotating grinding wheel protrudes in a suitable manner. For easier handling of such a grinding device, this can be equipped with guide rollers on the contact and support surfaces.

Claims

Expectations :

1. grinding device for reworking ski edges (5) with a rotating grinding body (7), characterized in that the central and drive axis (11) of the grinding body (7) at a front grinding insert atz in plan view of the tread (3rd ) of the ski (1) by an angle of attack (Od) with respect to a vertical lying in the running plane (3) in relation to the longitudinal direction of the ski (1) and, in the case of a circumferential grinding insert, viewed from the side transversely to the running surface (3) of the ski ( 1) is inclined by an angle of attack (ö ** -) with respect to a vertical to the running surface (3) of the ski (1), the angle of attack (W.) in each case being greater than 0 ° and less than 90 °.

2. Grinding device according to claim 1, characterized in that the grinding surface through the annular end face (13) of the pot-shaped grinding body (7) is used.

3. Grinding device according to claim 2, characterized in that the relative position of the ski edge to be ground (5) with respect to the cup-shaped grinding body (7) in side view is such that the ski edge (5) the inner surface of the cup-shaped grinding body (7) and thus touches the inner circle of the annular end face (13) at least tangentially, preferably in the manner of a secant.

4. Grinding device according to one of claims 1 to 3, characterized in that the angle of attack (bC) is at least 0.2 °, preferably at least 0.4 °, 0.6 °, 0.8 ° or at least 1 °.

5. Grinding device according to one of claims 1 to 4, characterized in that the angle of attack (Ot) at most 89 °, preferably at most 80 °, 70 °, 60 °, 50 °, 40 °, 30 °, 20 ° and ins ¬ special is at most 16 °, 14 °, 12 ° or 10 °.

6. Grinding device according to one of claims 1 to 5, characterized in that the central or drive axis (11) of the rotating grinding body (7) is aligned in a cross-sectional view transversely to the longitudinal direction of the ski edges (5) so that the tangent to the grinding body (7) at grinding height corresponds exactly to the preset cutting angle (V ").

7. Grinding device according to one of claims 1 to 6, characterized in that the central or drive axis (11) of the grinding body (7) in a cross-sectional view transverse to the longitudinal axis of the ski (1) in a further angle of attack (/>) relative to the tread (3) so inclined and in the engaged position of the annular end face (13) in relation to the tread (3) is such that the tangent of the grinding body (7) at grinding height on the ski edge (5) exactly the preset cutting angle (V ") corresponds.

8. Grinding device according to claim 6 or 7, characterized in that the further angle of attack (/ ^) corresponds to the angle of attack (° C) _ + 2 °, preferably _ + l °, in particular identical.

9. Grinding device according to claim 2 or 3, characterized in that the secant-shaped ski edge (5) based on the top för- the grinding body (7) the annular end face (13) at a distance from the central or drive axis (11) of 20% to 80%, preferably 50% to 80% of the outer radius of the cup-shaped grinding body (7), from the inner central - or drive axle

05 (11) measured from.

10. Grinding device according to claim 1 or 1 and 4 or 1 and 5, characterized in that the disc-shaped grinding body (7) in principle in the grinding insert has the shape of a single-shell

- ^{1 * *** takes 1} hyperboloids.

11. Grinding device according to claim 1 or 1 and 4, 1 and 5 or 10, characterized in that at a cutting angle (y ^* ') of 90 °, the ski edge to be ground (5) relative to the rotating grinding

15 body (7) in side view is such that the ski edge (5) intersects the central and drive axis (11) in the center of the rotating grinding body (7).

12. Grinding machine according to claim 11, characterized in that

20 when generating a cutting angle ^ ") of above or below 90 ° the rotating grinding body (7) is arranged in a side view of the cutting edge (5) to be ground so that the cutting edge (5) is the central or drive axis (11 ) cuts above or below the center of the grinding body (7).

25

13. Grinding machine according to one of claims 1, 1 and 5 or 10 to 12, characterized in that the lower limit of the angle of attack (Ä.) Is selected such that the ski edge (5) in side view of the ski edge (5) to be ground. the thickness of the rotieren¬

30 cuts and covers the grinding body (7) at the entire height.

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