US1983226A - Ski tie - Google Patents

Description

V. GRETSCH Dec. 4, i934.

SKI TIE Filed March 17, 1933 Patented Dec. 4, 1934 SKI TIE Viktor Gretsch, Feuerbach. Germany; Adolf Hofer, executor of said Viktor Gretsch, de-

assignor to Gretsch-Unitas G. m. b. H., Stuttgart-Feuerbach, Germany, a limited company o1' Germany Application March 17, 1933, Serial No. 661,321 In Germany March 21, 1932 2 Claims.

This invention relates to a fastening means for skis with adjustable toe irons for obtaining a good, tight fitting support of the boot between the irons and at the same time a permanent iirm hold of the irons after adjustment.

To enable the very accurate adjustment of the irons for fitting, adjusting screws such as are known for various other purposes, are employed. I'he novelty compared with the known adjustable cheeks consists in that besides the practical adjustability of the irons the individual connecting parts are secured against shifting and becoming loose.

An objection to the employment of screw nuts for the adjusting screws, such as are employed in the known adjusting iron connections, is also that the threads rust so that the nuts bind tightly. This objection is overcome in an effective manner by the application in that on the one hand the connection between the toe irons and the screw no longer consists in a toothed threaded portion on the end edges or inthe employment of male and female screw threads but in the tting of a screw threaded casing surface which surrounds about one quarter of the circumference of the screw thread surface and conforms with a worm drive with bevelled worm wheel. In order at the same time to establish the best possible rigid connection of the individual movable parts after the fitting, such as is an absolute necessity in the case of ski connections, counter pressure screws are arranged outside the adjusting screws and servetogether with a. corresponding shaping of the upper cover plate as counter bearing for the worm wheel engagement and press together the engaging parts with wedgelike connection. Thus, it is easily possible to produce such great frictional pressure between the upper and lower cover plates on the supporting 40 arms of the toe irons and the adjusting screws that an absolute reliable hold is ensured, even under considerable stresses, such as occur in steering skis when travelling at a high speed.

In order to permanently ensure this rigid xing of the toe irons the supporting arms of the toe irons are slightly wider between their two toothed portions than the space between the lateral adjusting screws so that these latter lie slightly hollow and consequently in the case of -the screw thread becoming worn can always be retightened The toothed portion of the edges of the toe iron arms allows these arms to be simultaneously pressed on both sides of the holding irons in a single operation and more accurately than possible by any other means. By

means of the pressure exerted, the material is compressed at these points which presents a particular advantage. Only by these means is it possible to obtain a full and deep screw as is necessary, although this must extend in arcuate shape owing to the curvature of the end edges of the irons and could not be obtained by incisions. It is of great importance, however, that the adjusting screw fits more perfectly and deeper in the screw thread than is attainable in the case of screw threads on the end edges and consequently a really durable and rigid pressing of the toothed portions one in the other is obtained.

An embodiment of the invention is illustrated by way of example in the accompanying drawing in which:-

Fig. l is a longitudinal section through a holding iron taken on line H-II of Fig. 2.

Fig. 2 is a top plan view of the ilxing means with the cover plate removed.

Fig. 3 is a part longitudinal section on a larger scale showing the position of a fixing screw.

A base plate a resting on the wood of the shoe has two transverse grooves for accommodating four adjusting screws b, b. To lock the screws against lateral shifting, incisions f are provided in the transverse grooves, for example for the heads bl and b2 on the ends of the screws. Between the plate a and cover plate d two toe irons c are arranged which are provided on their broad sides c1, c2 with screw threads pressed therein which are constructed in wedge-shape so that they surround a quarter of the circumference of the adjusting screws.

The wedge-shaped screw threaded pressed portions of the toe cheeks c bear at both ends on the adjusting screws b, b without coming into contact with the plate a. The cover plate d is provided at its front and rear ends with recesses d1 in such a manner that the adjusting screws b project partly therein and are covered thereby. The holding screws e are arranged so close to the adjusting screws that their heads engage in the recesses in the cover plate so that this latter bears tightly against the recesses for the adjusting screws and also act during their tightening against the adjusting screws and at the same time serve as a counterbearing therefor. The toe irons are, however, pressed wedge-like against the adjusting screws by the holding screws e1 so that a tight connection is obtained between the cover plate adjusting screws and holding irons, which withstands even the strongest strains. The ad- Justment of the toe irons for tting the ski boots tions having serrated edges engaging said screws, a cover plate, and means for fastening said cover plate to said base plate and ski, and adapted to force said screws into coacting relationship with said serrated edges.

2. A device as set forth in claim 1, in which the cover plate has downwardly inclined flanges and the fastening means consists of screws having countersunk heads which are adapted to press against the flanges to force the adjusting screws against the serrated edges. VIKTOR GRETSCH.

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