US3924865A - Steel edge - Google Patents

Steel edge Download PDF

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Publication number
US3924865A
US3924865A US312129A US31212972A US3924865A US 3924865 A US3924865 A US 3924865A US 312129 A US312129 A US 312129A US 31212972 A US31212972 A US 31212972A US 3924865 A US3924865 A US 3924865A
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United States
Prior art keywords
groove
edge
leg portion
extensions
ski
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Expired - Lifetime
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US312129A
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English (en)
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Wolfgang Benner
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Individual
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Individual
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/048—Structure of the surface thereof of the edges

Definitions

  • This invention relates to a steel edge, particularly for plastic skis, consisting of a profiled strip fixedly connected with the body of the ski, which strip essentially corresponds to the length of the ski edge, is flat along its underside, and is flush with the sole of the ski.
  • edges of the running surface of a ski are ordinarily reinforced by a profiled strip, called steel edge, in order to impart better tracking properties to the ski on icy or packed ground and in order to prevent premature wear and tear on the relatively soft body of the ski.
  • a flat-strip profile is extensively employed, composed of shorter longitudinal sections; this profile is attached to the body of the ski by means of screws at regular spacings. The process of connecting the sections to be joined by screws is extremely time-consuming.
  • angle edges are known which are received in cutouts in the body of the ski and are attached flush by means of screws with their horizontal profiled legs.
  • a thickened, vertical leg extends downwardly and forms the actual, visible steel edge.
  • the downwardly projecting length of this vertical leg corresponds to the thickness of a tread coating to be glued onto the underside of the ski body, this coating covering the horizontal legs of the angle edges and being enclosed between the vertical legs.
  • the horizontal leg of the angle edge consists essentially of individual horizontal ears disposed at longitudinal intervals, which contain the screw holes, while the vertical leg is interrupted by slots extending in a transverse or oblique direction at shorter spacings, so that a certain flexibility of the edge profile is achieved and a continuous edge profile can be employed.
  • the invention is based on the objective of providing a steel edge, particularly for all plastic skis, which, in the form of a continuous profiled strip, can rapidly be mounted permanently to the body of the ski, avoiding additional preparatory working steps.
  • substantially vertical extensions project from the profiled strip which are disposed at a spacing from its outer edge; these extensions are mounted, by the use of pressure and/or heat, in preformed, but more narrowly dimensioned recesses in the underside of the ski body.
  • the required recesses can be initially provided, in a plastic ski, within the injection mold, so that an additional machining of the ski body is eliminated.
  • the steel edge is thus no longer attached by screws, but rather joined, via the extensions, in a form-fitting and pressure connection with the ma terial of the ski body; consequently, the screw bores in the profiled strip are eliminated, which otherwise, to accommodate screws having sufficient holding force, exhibit a not inconsiderable diameter and therefore also require a relatively large width of the profiled strip.
  • the profiled strip can be made substantially narrower and also thinner, so that a flexibility is obtained which is sufficient for most purposes and an impairment of the elasticity of the ski body need not be feared. Of course, this factor also results in a reduced weight of the ski.
  • the extensions at the profiled strip can be tongueshaped extensions; they can be disposed within the same plane and can be bent out'of this plane at least partially. In this way, a good anchorage in the ski body is attained with the aid of a simple profile shape.
  • the tongues can be vertically slit, and the thus-formed sections can be bent alternatingly in opposite directions out of their common plane.
  • the tongues can have corrugations formed by longitudinal slots which extend away from the plane of the tongues.
  • the extensions can correspond, with respect to their height, approximately to the width of the profiled strip and can originate from the side opposite to the outer edge of the profiled strip or from the proximity thereof. In this way, a simple angular profile or an approximated T-profile is produced which is either drawn or manufactured by bending flat stock into a sharp edge.
  • the extensions can be produced by punching out the profiled web, and they can also be wider along their topsides than on their base. Thus, the flexibility of the steel edge is ensured by the cutouts or punched-out portions in the vertical profiled web, not considering the total dimensions which are considerably reduced as compared to conventional steel edges.
  • the steel edge is accommodated in the body of the ski in a continuous slot, the width of which corresponds approximately to the maximum width of the vertical projection of the tongues, whereas the depth of the slot is shallower than the height of the extensions.
  • the slot can be wider than if the extensions are disposed in one plane.
  • the cross section of the slot is dimensioned so that the synthetic resin displaced while the tongues are impressed therein escapes at least partially into adjoining zones of the slot cross section and can be received therein.
  • the extensions consist of pins of any desired cross section arranged at longitudinal spacings along the profiled strip, these pins being provided with peripheral ribs. These pins can be passed, as rivets, through openings in the profiled strip and riveted in place.
  • the extensions provided at the profiled strip are suitably rolled or pressed into the ski body with the aid of Ultrasonics.
  • a. roller welding machine can be employed, equipped with an ultrasonic head.
  • the melting process of the synthetic resin material in the body of the ski is initiated only by frictional heat at the external zones of the extensions, while the edge profile proper and the ski remain cold.
  • the thusoccurring welding temperature for example in case of polystyrene hard foam, is maintained within ranges wherein the synthetic resin, though being deformable and sometimes somewhat plastic, does not yet become brittle.
  • the tongue-type extensions can be mounted in the slot by the introduction of a deformable auxiliary substance, the bottom of the slot being widened at least in the zone of the extensions.
  • the auxiliary substance can consist of an adhesive retaining its resiliency within limits, so that in any event a certain relative longitudinal movability of the steel edge is obtained and the application of the steel edge is not limited to plastic skis.
  • the auxiliary substance can also consist of an elastic profiled strip which is pressed into the slot together with the extensions and is partially displaced during this step into recesses within and/or between the extensions. If the slot has a greater width in its bottom zones than at its entrance, the desired form-fitting connection is produced between the spread-apart extensions and the elastic profiled strip, on the one hand, and the special cross section of the slot, on the other hand.
  • FIG. 1 shows a ski body consisting of hard foam material, with a steel edge according to this invention
  • FIGS. 2-8 are schematic views and partial crosssectional views of various examples
  • FIGS. 9 and 9a show a cross section through other embodiments.
  • FIG. 10 is a modification of the steel edge of this invention.
  • the ski body shown in cross section, consists of a hard synthetic resin foam and has been manufactured in one working step in an injection mold. During this manufacturing step, the central running groove 10 and lateral groves 11 as well as adjoining lateral recessed faces 12 have been molded into the ski body.
  • the width of the profiled strip 15 is about 4 mm. and the vertical height of the extensions 16 of the profiled strip is likewise about 4 mm.
  • the thickness of the material of the steel edge 14, which latter is preferably produced as an angular profile, ranges between about 0.4 mm. and 1.0 mm.
  • the width of the groove 11 is approximately 1.5 mm. to 2 mm. and the depth thereof is about 2.5 mm. to 3 mm., but on the side of the face 12, only about 1.5 mm., so that the anchored steel edge 14 is flush with the running surface.
  • the recess 12 can be omitted if a running surface tread is glued onto the ski between two steel edges, for example when the steel edge is used in other types of skis made of wood or also combinations of wood and plastic.
  • a continuous, deeper groove can be provided which is filled with an adhesive or into which is pressed an elastic profiled strip, for example together with the tongue-shaped extensions according to one of FIGS. 2 through 8.
  • This profiled strip enters the recesses within or between the tongues or is expanded into these recesses, and retains the tongues by virtue of the fact that the groove near its bottom, has a greater width than at its entrance (FIG. 9).
  • This profiled strip can consist, for example, of a rubbery material which is first flattened upon being pressed into the slot and is then expanded again at a greater depth in the slot and thus provides a locking connection.
  • Another way of mounting the steel edge of this invention in a ski made entirely of a synthetic resin is effected with the use of pressure and ultrasonics.
  • a so-called roller welding machine provided with an ultrasonic head is employed, by means of which the steel edge is rolled under pressure and simultaneous transmission of ultrasound into the plastic material.
  • the temperature occurring in this process can be controlled so that it remains in the range between and C., wherein the synthetic resin material is just barely deformable, optionally slightly plastic.
  • the extensions 16 are produced by punching out circular holes at regular intervals in the vertical profiled web.
  • the starting material can be an angular profile or also a profile shaped like a T wherein the vertical web from the center of the flat strip is offset toward the inside in order to obtain improved support and pressure introduction during rollin g.
  • the extensions have been produced by triangular punched-out portions.
  • the tips of the extensions 16 can be rounded-off at point 17 in order to obtain an easier penetration during welding and to prevent hairline cracks in the hard foam.
  • FIG. 4 shows T-shaped extensions 16 preferably suitable for mounting the steel edge with the use of an auxiliary material (elastic adhesive or profiled strip).
  • the tongues can be bent out of the original profile plane alternatingly toward opposite sides, or they can be slightly twisted out of this plane.
  • the vertical web of the steel edge profile is only slit, the individual extensions produced by the slits being bent or twisted alternatingly toward opposite directions. These measures also provide an enlarged surface area contributing toward an improved mounting of the tongues within the plastic material. Additionally, transverse bores or protuberances 13 can be provided in any desired form of the extensions 16.
  • the extensions 16 are provided with projections 18 similar to barbs and have an over-all form which is slightly tapered conically in the upward direction.
  • This configuration can be employed in tongue-like extensions produced by punching out sections from an angular profile or also in pin-shaped extensions which then have the projections 18 along their periphery. The pins are passed through corresponding openings in the flat strip and riveted thereon.
  • the extensions 16 contain several vertical cuts linked to one another by means of a transverse bottom cut.
  • the thus-produced tongues 19 are bent out of the plane of the extension toward one side or toward both sides, resulting, in view of the small thickness of the material, in a certain elasticity of the tongues 19. This improves the anchoring in the plastic material, since the tongues spread elastically after being pressed or welded into the material.
  • FIG. 9 shows, in a schematic cross section, two different groove shapes in the ski body, making it possible to hold the steel edge in a form-fitting connection and simultaneously providing the relative longitudinal movability of the steel edge with respect to the ski body.
  • the steel edge can be provided, on the one hand, similar to FIG. 7, with elastic tongues 19 which spread similarly to a straddling dowel after pressing the steel edge into the groove.
  • an elastic adhesive or an elastic profiled strip can be employed in order to improve the form-locking connection between the steel edge and the ski.
  • an expansion or widened portion is provided at the bottom of the groove, wherein the extensions 16, fashioned in principle similarly to FIG.
  • the subdivision of a one-piece steel edge into segments according to FIG. can be necessary and practicable in case thicker steel edges must be used for heavy-duty and/or more wear-resistant skis, which edges then have no longer inherently the required flexibility.
  • the segments 22 are joined by means of bridging strips 23 to a prefabricated segmental strip, there being an expansion joint 24 of about 1 mm. between the respective individual segments.
  • the elastic bridging strip consists, for example, of rubber vulcanized to the edge, or also of a very thin metallic band.
  • the prefabricated segmental strip of FIG. 10 can either be initially in serted in the injection mold, as way all the other embodiments, and can be retained therein, for example,
  • the strip is likewise suitable for being subsequently welded into a semifinished groove by means of ultrasonic methods, wherein the elastic bridging strip 23 is expanded by the use of pressure downwardly into the expansion joint and fills the latter.
  • a ski having a body fabricated of wearable, flexible material, a wearing edge construction on at least the two bottom edges of the ski body comprising, for each edge;
  • a longitudinal anchoring groove having its cross-sectional profile defined by two opposing groove flanks and a groove bottom, said groove extending vertically from the ski bottom spaced from an adjacent bottom edge and extending substantially parallel to the bottom edge and having a cross-sec- 6 tional depth which is greater than its cross-sectional width;
  • a wear resistant metallic edge profile of generally L- shaped cross section, having a horizontal leg portion covering at least that portion of the bottom surface of the ski which is included between said groove and the bottom edge of the ski, and a substantially vertical leg portion received between said groove flanks;
  • bonding means arranged in said groove for retaining the vertical leg portion of the edge profile within the groove flanks, said bonding means having resilience sufficient to retain said vertical extensions in said groove while permitting longitudinal movement of said extensions within said groove.
  • the gaps associated with the cuts in the vertical leg portion are longitudinal in direction and are constituted by missing length increments of the vertical leg portion.
  • the gaps associated with the: cuts in the vertical leg portion are transverse in direction and constituted by transversely alternating offsets of said tongueshaped extensions from a common alignment plane.
  • At least a portion of said vertical leg portion of the edge profile is displaced from the plane of said leg portion for engagement with the groove flanks, said portion being elastic by virtue of a thin material guage providing flexibility of said leg portion.
  • flanks of the anchoring groove diverge in the direction of groove depth, thereby defining a groove profile with a comparatively small width at its entry and a comparatively larger width deeper inside the groove, whereby a snap-fit engagement is achieved between said groove flanks and said leg portions.
  • the tongue-shaped vertical extensions formed from the vertical leg portion, include laterally protruding auxilliary anchoring means.
  • each of the tongue-shaped vertical extensions, formed from the vertical leg portion is alternatingly transversely offset from a common alignment plane so as to define a side set as in a saw.
  • tongue-shaped vertical extensions include a vertically oriented generally double-U-shaped transverse cut therethrough defining two adjacent smaller anchoring tongues, the latter being resiliently connected to said tongue-shaped extensions near their upper ends and alternatingly

Landscapes

  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US312129A 1971-12-03 1972-12-04 Steel edge Expired - Lifetime US3924865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2159993A DE2159993A1 (de) 1971-12-03 1971-12-03 Stahlkante, insbesondere fuer kunststoffski

Publications (1)

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US3924865A true US3924865A (en) 1975-12-09

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US312129A Expired - Lifetime US3924865A (en) 1971-12-03 1972-12-04 Steel edge

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US (1) US3924865A (https=)
AT (1) AT327072B (https=)
DE (1) DE2159993A1 (https=)
FR (1) FR2162224B1 (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050104329A1 (en) * 2003-11-13 2005-05-19 Ellison Matthew W. Replaceable, interchangeable edge and grind plate systems for skis and snowboards
US20070164522A1 (en) * 2003-11-13 2007-07-19 Ellison Matthew W Glinding boards and methods of modifying gliding boards
WO2007101257A3 (en) * 2006-02-28 2008-09-18 Matthew Wade Ellison Ski and snowboard equipment system
US20130307232A1 (en) * 2012-04-11 2013-11-21 Neil Pryde Limited Board for water sport or snow sport and a method of manufacturing thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548094A (en) * 1943-01-21 1951-04-10 Bonna Narve Wearing edge for skis
US2549534A (en) * 1949-09-28 1951-04-17 Shultz Arthur Wright Ski edging
US3151873A (en) * 1962-06-20 1964-10-06 Riha Hans Metal ski
US3401949A (en) * 1966-09-16 1968-09-17 Fouillet Bernard Metallic edge members for skis
US3580596A (en) * 1968-02-27 1971-05-25 Voelkl Ohg Franz Ski construction

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH402696A (de) * 1963-10-07 1965-11-15 Attenhofer Ag A Metallkante an Ski
FR1430047A (fr) * 1964-04-24 1966-02-25 Graves Corp Carre métallique pour skis
FR1448596A (fr) * 1964-10-09 1966-08-05 Brueder Riha K G Ski constitué par plusieurs parties individuelles assemblées
FR1546136A (fr) * 1966-11-30 1968-11-15 Fritzmeier Kg Georg Ski en matière plastique et procédé pour sa fabrication
US3503621A (en) * 1968-05-08 1970-03-31 Kimball Schmidt Inc Fiber glass ski with channel construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548094A (en) * 1943-01-21 1951-04-10 Bonna Narve Wearing edge for skis
US2549534A (en) * 1949-09-28 1951-04-17 Shultz Arthur Wright Ski edging
US3151873A (en) * 1962-06-20 1964-10-06 Riha Hans Metal ski
US3401949A (en) * 1966-09-16 1968-09-17 Fouillet Bernard Metallic edge members for skis
US3580596A (en) * 1968-02-27 1971-05-25 Voelkl Ohg Franz Ski construction

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050104329A1 (en) * 2003-11-13 2005-05-19 Ellison Matthew W. Replaceable, interchangeable edge and grind plate systems for skis and snowboards
US20070164522A1 (en) * 2003-11-13 2007-07-19 Ellison Matthew W Glinding boards and methods of modifying gliding boards
US8251395B2 (en) * 2003-11-13 2012-08-28 Matthew Wade Ellison Gliding boards and methods of modifying gliding boards
WO2007101257A3 (en) * 2006-02-28 2008-09-18 Matthew Wade Ellison Ski and snowboard equipment system
US7641215B2 (en) * 2006-02-28 2010-01-05 Matthew Wade Ellison Ski and snowboard equipment system
US8075003B2 (en) 2006-02-28 2011-12-13 Matthew Wade Ellison Boot for use with a gliding board
US20130307232A1 (en) * 2012-04-11 2013-11-21 Neil Pryde Limited Board for water sport or snow sport and a method of manufacturing thereof

Also Published As

Publication number Publication date
DE2159993A1 (de) 1973-06-14
FR2162224A1 (https=) 1973-07-13
FR2162224B1 (https=) 1978-02-10
ATA996772A (de) 1975-03-15
AT327072B (de) 1976-01-12

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