US3907314A - Edge members for ski - Google Patents

Edge members for ski Download PDF

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Publication number
US3907314A
US3907314A US443115A US44311574A US3907314A US 3907314 A US3907314 A US 3907314A US 443115 A US443115 A US 443115A US 44311574 A US44311574 A US 44311574A US 3907314 A US3907314 A US 3907314A
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Prior art keywords
elongated slot
pair
grooves
edge
straight portion
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Expired - Lifetime
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US443115A
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English (en)
Inventor
Ryoji Tanahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Gakki Co Ltd
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Nippon Gakki Co Ltd
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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

  • ABSTRACT A ski edge member with: a straight portion divided into a plural number of sections by longitudinally forwardly inclined slit-like cracks. and a web integral with the straight portion and extending horizontally from one side of said straight portion. the web having. in each region corresponding to a crack, a pair of grooves eachhaving one end extending close to the straight portion and the other end being open so as to position the crack midway between the one ends of said pair of grooves.
  • the web further has a connecting member for connecting adjacent ones of said sections flanked, via the pair of grooves, by reinforcing lugs and having an inner cutout at a site substantially on the extension of the crack and having an elongated slot surrounding the inner cutout.
  • the crack is open into the elongated slot
  • the connecting member further has a pair of resilient projections defined by the pair of grooves and the elongated slot and also a resilient flap. portion defined by said elongated slot and said inner cutout and further having connecting portions connecting said resilient projections with said flap portion.
  • the present invention pertains to edge members for skis, and more particularly it relates to edge members for skis such that they do not impair the flexibility of ski bodies.
  • a ski is generally comprised of a ski body and a shoefastening means attached to the ski body.
  • the ski body is provided, longitudinally of the ski body, with edge members made in general of steel for the purpose of protecting the sole surface and for the purpose of easily causing the lower lateral edge portion of the sole to bite into the snow surface, which is the so-called edging performance, when it is intended to reduce the speed during gliding.
  • edge members made in general of steel for the purpose of protecting the sole surface and for the purpose of easily causing the lower lateral edge portion of the sole to bite into the snow surface, which is the so-called edging performance, when it is intended to reduce the speed during gliding.
  • the ski body per se is not rigid but resilient, rich in flexibility. In order to maintain this resiliency. there have been many efforts in the arrangement and design of the ski body.
  • edge members made of rigid steel are fixed to thesole surface of a ski body, the initial resiliency of the ski body is impaired, and the ski body equipped with such rigid edge members will itself have an additional rigidity. Thus, the desired characteristics of the resulting complete ski which has been produced with great designing skill will be lost.
  • edge members which will not reduce the resiliency of the ski body.
  • edge members called cracked edge members" each having a plurality of spaced slits in thestraight running portion to provide a plural number of straight sections.
  • the cracked edge members are constructed so as not to substantially impair the flexibility of the ski body.
  • cracked edge members which are either available now or known at present, there may be given the following two types, one of which is the cracked edge member described in Japanese Pat. Publication No. 45-6341 and the other is the cracked edge member disclosed in West German Utility Model No. 6905035 representing an improvement of the former.
  • the former however, has the problem that the edge member is susceptible to breakage as the bending stress applied to the edge member is concentrated in the portions having cracks.
  • the cracks have no advantage other than that they do not impair the flexibility of the ski body. It may be said that the cracks themselves even contribute to making the edge member break more easily whenever a substantial tensile stress is applied to the cracked portions. Therefore, efforts have been made to will be subjected to a marked pulling force.
  • edge members are unable to adapt themselves to this stress applied, they will eventually break.
  • this easily breakable portion of the edge member is reinforcedwith a rigid element, then the edge member having such a reinforced portion will no doubt possess an excessively great strength against the tensile stress applied, contributing to an increase in the rigidity of the edge member.
  • the flexibility or resiliency of the ski body will be reduced greatly.
  • each ski In case a tensile load is applied to edge members because a pers'on mounts on skis, the archbend regions of these skiswill be subjected to a bending load. Accordingly, the sole surface of each ski which is located at a position lower than the center of the ski body will have to support the tensile load applied. The ski body as a whole also will undergo an extension to a slight degree. Each edge member which is integrally attached to the ski body will be caused to extend also.
  • edge members employed are cracked edge members
  • such an extension will be manifested as the total of both the extension strain representing the widening apart of the respective slit-like cracks of the edge member andthe extension strain of the straight portions of the edge member which are the portions that unite together the respective sections divided by the cracks.
  • An edge member itself requires only a sufficient rigidity.
  • the edge members which are arranged as integral parts of the ski body adapt themselves so as toex ert an extension in conformity to the extension of the skibody, there will naturally develop staggering of positions between the edge members and the ski body.
  • edge members are made of a material, s uc h as rubber, which can extend in confor mity with the extension of the ski body, there will develop no staggering in position between the edge members and the ski body nor will there arise any impairment of the flexibility of the ski body.
  • edge members are made of a material, s uc h as rubber, which can extend in confor mity with the extension of the ski body, there will develop no staggering in position between the edge members and the ski body nor will there arise any impairment of the flexibility of the ski body.
  • it is impossible to find a material which meets the aforesaid requirements as edge members of a ski it is impossible to find a material which meets the aforesaid requirements as edge members of a ski,
  • edge members having a somewhat lessened rigidity. If the straight portion of a steel edge member is provided with a number. of closely positioned cracks throughout its length, such an edge member would surely possess a great adaptability to the deformations developed by the ski body. However, such a cracked edge member will member will never be suitable for use.
  • Another object of the present invention is to provide a cracked edge member of the type described, which is not too rigid as would decrease the operability in attaching it to a ski body nor so rigid as would hamper the bending deformation of the ski body but can sufficiently cope with the widening of the gaps of the cracks whenever a substantial tensile stress is applied thereto.
  • FIG. 1 is a perspective view of a part of an L-shaped edge member embodying an example of the present invention.
  • FIG. 2 is a bottom plan view of the same part of FIG. 1.
  • FIG. 3 is a perspective view of a part of the same edge member of FIG. 1 but shows the repetition of the patern of the connecting members and reinforcing lugs both of which form a part of the edge member of FIG. 1.
  • FIG. 4 is a bottom plan view similar to FIG. 2, showing a modified example of the essential part of the edge member according to the present invention.
  • FIG. 5 is a similar view, showing still another modified example.
  • FIG. 6 is a cross section ofa ski to show how the edge members of the present invention are attached to the ski.
  • FIG. 7 is a diagrammatic fragmentary side view of a part of the straight portion of an edge member according to the present invention to show an inclined slitlike crack.
  • FIGS. 1 through 3 there is shown a part of a first example of the L-shaped cracked edge member according to the present invention.
  • This edge member shown generally at A is made of steel and is to be provided on a ski body in the longitudinal direction thereof.
  • the straight portion of the edge member A which is indicated generally at l is of a substantially square cross section.
  • a web 2 having its upper surface positioned at the same plane with that of the upper surface of the straight portion 1 and having a thickness which is about one third of the vertical height of the straight portion 1 extends horizontally from a lateral side of the straight portion 1 for the entire length thereof.
  • This straight portion I is provided with slit-like cracks 11 which are disposed at constant intervals.
  • Each of these cracks 11 is inclined in such a way that its upper portion is positioned closer toward the shovel portion of the ski and its bottom portion is positioned closer toward the tail of the ski relative to the running direction X of the ski, as shown in FIG. 7.
  • the intervals between the cracks 11 are in the range of, generally, 2 to 3 cm.
  • the web 2 has a plural number of connecting members indicated generally at 21 and reinforcing lugs generally indicated at 22.
  • This connecting member 21 has an elongated slot 21:: which is of a substantially semicircular arcuatc configuration having its center C located on the extension I- of the slit-like crack 11. The crack 11 is extended toward the center C so that the crack is open into the slot 210.
  • That portion of the connecting member 21 containing the center C is provided in the from of a substantially Ushaped inner cutout 2112 of a substantial width in the radial direction of the aforesaid arcuate slot 21a and having substantially parallel legs of U-shape and having a rounded closed bottom of said U-shape so that the end edge of the connecting member 21 in the portion which is away from the straight portion 1 is open.
  • a reinforcing lug 22 there is provided a groove 23 which is arcuate in configuration concentric with the semi-circular elongated slot 21a.
  • This arcuate groove 23 extends at its one end toward the inner side of the straight portion 1 in such a way that this one end terminates as a closed end with a small interval from said inner side of the straight portion 1.
  • this closed end of the arcuate groove 23 which is located on the straight portion 1 side is positioned closer to the slit-like crack 11 which is formed in the straight portion 1.
  • the reinforcing lug 22 is formed between two arcu ate grooves 23 and 23. This reinforcing lug 22 is provided. at a central portion. with an opening 221! for the purpose of enhancing the adhcrency of the edge member A to the component members of the ski body by allowing an adhesive to be applied in this opening 221! to be filled therein.
  • This reinforcing lug 22 has flexibility because of its opening 22a.
  • each pitch between the adjacent slit-like cracks l1 and 11 is disposed one connecting member 21 and one reinforcing lug 22, respectively.
  • the connecting member 21 is such that it is locally cut away at the semicircular elongated slot 21a and at the inner cutout 2112.
  • This inner cutout 21/ has a closed end edge 21']; which is round in configuration and concentric with the semi-circular elongated slot 21a.
  • the ends of this round closed end edge 21 '12 have extensions 21") and 21"]; which are rectilinear and form parallel legs of U-shape having an open other end.
  • the connecting member 21 corresponding to a crack 1 l is rendered as a continuous member longitudinally of the edge member A by a solid part or flap 21A which is semi-circular and flexible and located on the proximal center side of the semi-circular elongated slot 21a.
  • This semi-circular flap 21A is not of a wave-like shape.
  • the proximal edge is shaped to have a round edge by the aforesaid inner cutout 21b having a considerable depth.
  • this semi-circular flap 21A gives a basis for the general contour of the connecting member 21.
  • the outer peripheral solid portion or projection 21B of the semi-circular elongated slot 21a has a breadth similar to that of the semi-circular flap 21A and an arcuate shape which is substantially concentric with this semi-circular flap 21A.
  • this portion 218 is provided as a flexible element.
  • One end of the outer peripheral solid portion or projection 21B joins the straight portion 1 of the edge member A.
  • the arcuate groove 23 in this example is not perpendicular to the length of the edge member 1 nor is it of a wave-like shape as will be clear from the foregoing statement.
  • This arcuate groove 23 is provided so as to extend, in
  • each ski retains its initial so-called arch-bend," i.e. the form of the central part of the ski which is warped in an archlike bent form.
  • this arch-bend becomes depressed or sunken a little, causing a tensile stress to develop at the surface of sole.
  • the edge members of the ski also will be subjected to a tensile load.
  • the degree of extension which can be exerted by the connecting member 21 is extremely great as compared with that exerted by the straight portion 1 of the edge member. Even in case the gap of the crack is widened substantially, the connecting member 21 is able to develop a lengthwise extension to sufficiently cope with this widening of the crack.
  • this absorption of extension by the connecting member 21 is materialized by the fact that this connecting member 21 which connects those divided sections of the straight portion 1 of the edge member A which are rendered to severed state by the provision of cracks is of such a configuration as giving a great allowance for an extension by the cooperation of the semi-circular elongated slot 21a surrounding the semi-circular flap 21A and the inner cutout 2112 provided in a radial direction of the elongated slot 210.
  • the connecting member 21 which faces the crack 1 l is of a configuration whose solid regions each has a small breadth.
  • thearcuategrooves 23 and 23 which are provided on the outer sides of the connecting member 21 are each of such an arcuate configuration extending at one ends toward the slit-like crack 11. Accordingly. when compared with known cracked edge members. it is possible to expect markedly great elasticity from the edge members of this example of the present invention.
  • FIG. 4 shows another embodiment which shows a modification of especially the configurations of the connecting member 221 and of its surrounding grooves 223.
  • the connecting member 221 generally has a somewhat rectangular configuration. More specifically, the connecting member 221 has an elongated slot 221a which is of a substantially U-shaped configuration in which both legs of U-shape are substantially symmetrical relative to the extension of the slit-like crack 11. That portion of the connecting member 221 corresponding to the inner cutout 21b of FIG. 2 is provided as an inner cutout 2211) having a substantially U-shaped configuration but having a rather flat closed bottom 221'! of U-shape. Therefore, the solid part 221A is ofa generally U-shaped configuration having a rather flat bottom of U-shape.
  • the outer peripheral projection 21B of FIG. 2 is provided, in this example of FIG. 4, in the form of generally a straight projection as shown at 2218.
  • the arcuate groove 23 of FIG. 1 is provided, in this example of FIG. 4, in the form of a generally straight U-shape groove; 223 having a generally flat bottom of U-shape having substantially parallel legs of U-shape. Both of these elements 221A and 2218 are resilient as in the preceding first example.
  • the reinforcing lug 222 having an opening 222a is substantially similar to the flexible reinforcing lug 22 of FIGS. 1 and 2 excepting for the substantially straight edge line adjacent to the groove 223.
  • the flexible outer peripheral projection 2218 and the flap 221A which is contiguous to the projection 221B jointly cooperate in withstanding a deformation stress applied to the edge member A having these elements 221B and 221A.
  • FIG. 5 shows a still another embodiment.
  • the connecting member 321 has a generally one longitudinal half of an oval shape.
  • This connecting member 321 has an elongated slot 321a which is of an oblong configuration defined between two lines each being substantially one half of an oval shape, and this slot 321:! is substantially symmetrical relative to the slit-like crack 11.
  • the inner cutout 21b of FIG. 2 is provided. in this example of FIG. 5, as an inner cutout 321! having a configuration which is a substantially one longitudinal half of an oval shape with its apex which is closer to the straight portion 1 being rounded and with its opening being widened because of the curved extensions 321 b of edges of the leg portions of a wide U-shape inner cutout 3211;.
  • the flexible flap 321A is of a substantially one longitudinal half of an oval shape.
  • the groove 323 is of a configuration as shown in FIG. 5. forming an elongated flexible projection 3218 as shown.
  • the flap 321A is contiguous with the projection 3218 and they cooperatively resist any deformation stress applied to the edge member A
  • the patterns of the connecting member and the adjacent reinforcing lug are to occur repeatedly in the same manner as shown in FIG. 3 which represents the first example.
  • the cracks 11 are open into the elongated slot 221:! or 32141 and are each provided so as to beinclined with its upper end closer to the shovel portion of the ski in the same manner as described in connection with the first example.
  • the edge members A according to the present invention are provided on both sides of the ski body.
  • Reference numeral 24 represents the top surface member of a ski. 25. core members. 26. side members. and 27. the bottom or sole member of the ski.
  • the edge members A of this invention are fixedly secured between the bottom and core members.
  • Top edge members 28 may be provided at the upper parts of the ski.
  • a ski is provided with an appropriate number of slit-like cracks. Because of these cracks. the edge members are not of such a rigidity as would decrease the sound efficiency of attaching them to the ski body or would hamper the bending deformation of the ski body. Besides, the edge member as a whole can sufficiently accomodate the widening of the cracks whenever a tensile load is applied to the edge member. Thus. an ideal edge member is obtained.
  • An edge member for a ski comprising a straight portion and a web extending horizontally from one side of said straight portion.
  • said straight portion being divided into a plural number of sections by slit-like cracks.
  • said web having. in each region corresponding to a crack. a pair of grooves each having one closed end located close to the straight portion and an open other end. said pair of grooves being positioned so that the crack is intermediate the closed ends of said pair of grooves.
  • said web further having. in each said region. a connecting member for connecting adjacent ones of said sections of the straight portion. said connecting member being flanked. via said pair of grooves and. by reinforcing members. said reinforcing members forming the portion of the web between successive pairs of grooves.
  • said connecting member further having. at a site substantially corresponding to the extension of said crack. an inner cutout with one closed end and open other end and an elongated slot surrounding this inner cutout. said crack being open into the elongated slot.
  • said connecting member further having a pair of resilient projections defined by said pair of grooves and said elongated slot; a resilient flap defined by said elongated slot andsaid inner cutout; and connecting portions for connecting said resilient projections with said flap.
  • An edge member according to claim 1. in which said elongated slot is of a configuration substantially one longitudinal half of an oval shape. and said inner cutout is of a configuration substantially one longitudinal half of an oval shape. and said a pair of grooves each has a configuration for defining the curved outer peripheral part or projection of the elongated slot.

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  • Road Paving Structures (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
US443115A 1973-02-20 1974-02-15 Edge members for ski Expired - Lifetime US3907314A (en)

Applications Claiming Priority (1)

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JP48020374A JPS5243414B2 (de) 1973-02-20 1973-02-20

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JP (1) JPS5243414B2 (de)
CA (1) CA997798A (de)
DE (1) DE2408360C3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068861A (en) * 1976-02-26 1978-01-17 Hexcel Corporation Lightweight, flexible ski
US4778710A (en) * 1984-04-16 1988-10-18 Friedrich Deutsch One-piece ski edge with integrated tip and/or end protection
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
US20070200317A1 (en) * 2006-02-28 2007-08-30 Ellison Matthew W Ski and snowboard equipment system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765113B1 (fr) * 1997-06-27 1999-08-20 Rossignol Sa Procede de preparation de carres pour planche de glisse et planche de glisse obtenue avec ces carres
DE10123674B4 (de) * 2001-05-16 2005-11-10 Stahlwerk Ergste Westig Gmbh Gleitkantenprofil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401949A (en) * 1966-09-16 1968-09-17 Fouillet Bernard Metallic edge members for skis
US3700252A (en) * 1971-01-29 1972-10-24 Olin Corp Metal edge members for skis having varied lengthwise stress-strain ratio and skis including such members
US3751054A (en) * 1971-07-09 1973-08-07 F Deutsch Ski edge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH464035A (de) * 1968-03-19 1968-10-15 Franz Dipl Ing Litschauer Gliederkante für Schier
DE2133191C3 (de) * 1970-07-17 1976-01-08 Friedrich Innsbruck Deutsch (Oesterreich) Skikante
JPS5136096Y2 (de) * 1971-04-20 1976-09-04

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401949A (en) * 1966-09-16 1968-09-17 Fouillet Bernard Metallic edge members for skis
US3700252A (en) * 1971-01-29 1972-10-24 Olin Corp Metal edge members for skis having varied lengthwise stress-strain ratio and skis including such members
US3751054A (en) * 1971-07-09 1973-08-07 F Deutsch Ski edge

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068861A (en) * 1976-02-26 1978-01-17 Hexcel Corporation Lightweight, flexible ski
US4778710A (en) * 1984-04-16 1988-10-18 Friedrich Deutsch One-piece ski edge with integrated tip and/or end protection
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
US20070200317A1 (en) * 2006-02-28 2007-08-30 Ellison Matthew W 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

Also Published As

Publication number Publication date
JPS49109138A (de) 1974-10-17
CA997798A (en) 1976-09-28
DE2408360B2 (de) 1980-09-18
DE2408360A1 (de) 1974-08-29
JPS5243414B2 (de) 1977-10-31
DE2408360C3 (de) 1981-06-04

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