EP0004713A2 - Zwillingski - Google Patents

Zwillingski Download PDF

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Publication number
EP0004713A2
EP0004713A2 EP79300381A EP79300381A EP0004713A2 EP 0004713 A2 EP0004713 A2 EP 0004713A2 EP 79300381 A EP79300381 A EP 79300381A EP 79300381 A EP79300381 A EP 79300381A EP 0004713 A2 EP0004713 A2 EP 0004713A2
Authority
EP
European Patent Office
Prior art keywords
twinski
tail
secured
section
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP79300381A
Other languages
English (en)
French (fr)
Other versions
EP0004713A3 (en
Inventor
Alec Pedersen
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.)
Pedersen Industries Ltd
Original Assignee
Pedersen Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pedersen Industries Ltd filed Critical Pedersen Industries Ltd
Publication of EP0004713A2 publication Critical patent/EP0004713A2/de
Publication of EP0004713A3 publication Critical patent/EP0004713A3/xx
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • A63C5/06—Skis or snowboards with special devices thereon, e.g. steering devices
    • 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
    • A63C5/052—Structure of the surface thereof of the tips or rear ends
    • 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
    • A63C5/16—Devices enabling skis to be used whilst held in a particular configuration with respect to each other, e.g. for training purposes

Definitions

  • This invention relates to a twinski having a nose section and a pair of tail sections separated by a longitudinal slot, the tail sections being at least five times as long as the nose section, the nose section including an upwardly curved forward tip region, the tail sections each including a central segment and a terminal tail segment, the twinski having its greatest thickness at the central waist portion, and being reduced in thickness both towards the tail portion and the forward tip, the minimum thickness being adjacent to the forward tip region and a bridge means connecting the ends of the tail segments.
  • the present inyention proposes a solution to the problem of providing an improved monoski which includes a wider stance for balance, is adaptable to virtually all snow conditions, is lighter in overall weight and is easy to use and to control during many skiing manoeuvers.
  • the bridge means is a connector plate secured to the end of each of the tail portions and a single continuous curved connecting rod secured at its ends to a respective one of the connector plates.
  • each end of the connecting rod is pivotally connected to its respective connector plate.
  • the bridge section is a connector plate provided with an upstanding post secured to the end of the tail portions, and a connector bar interconnecting the upper ends of the upstanding posts.
  • connection between the connector bar and the upper end of each upstanding post is a universal joint to provide pivotal movement.
  • the connecting bar or rod is formed of tension steel.
  • the connector bar or rod is adjustable in length to provide controlled spacing between the ends of tail portions.
  • the bridge means is secured to the tail section by a bottom plate, substituting a portion of the lower skin of the twinski.
  • the upper plate is secured to the lower plate by a bolt, passing through the upper plate, the ski core and tapped h J les in the lower plate.
  • the upper plate is provided with a pair of spaced-apart ears, having aligned apertures, a connecting bar disposed between the ears, the connecting bar having an aperture therethrough at the lower end; and a pin extending through all the apertures to provide hinged connections.
  • the lower plate is provided with a pair of upstanding, spaced-apart ears, which project through the ski and the upper plate, the ears having aligned apertures, a connecting bar disposed between the ears, the connecting bar having an aperture therethrough at the lower end; and a pin extending through all the apertures to provide hinged connections.
  • connection bar is provided with a protective wrapper.
  • the twinski includes a groove in the base of each of the tail sections.
  • the total width of the tail i.e. the width of the two tail segments and the width of the slot
  • the width of the tip at the mononose section may be the same, or wider than the width of the tip at the mononose section.
  • the width of the longitudinal slot is the same as the width of each of the tail sections.
  • each bifurcated tail section may be widor than the slot, at the tail.
  • the slot converges from the tail to the integral mononose, and especially where the slot converges more sharply into the integral mononose.
  • the integral mononose section is formed of exceptionally strong material to resist twisting moments of the tail segments.
  • ski bindings are mounted on the tail section of the ski adjacent the central wait portion for holding the feet of a skier in close side-by-side relation
  • the bindings include a pair of toe members mounted parallel to one another on individual base. plates, each such base plate secured directly onto a respective tail section of the ski, and a pair of heel members mounted parallel to one another on individual base plates, each such base plate being secured directly onto a respective tail section of the ski.
  • the twinski is formed of a foam core, with stiffening members of wood, and laminated to a glass fiber sheet, and a synthetic plastics material on the bottom, running surface.
  • the twinski is formed of a laminate of hickory, ash, and glass fiber, with an upper laminated surface of airplane aluminium, and a bottom running surface of a synthetic plastics material.
  • the twinski is formed of a honeycomb core, either of a plastics material, or a metal, e.g. aluminium, laminated to a glass fiber sheet or to a sheet of airplane aluminium and a running surface of a synthetic plastics material.
  • the twinski includes four steel running edges along the edges of the tail portions of the twinski.
  • the dimensions of the twinski are as follows:
  • the twinski has a wider stance to improve balance, is adaptable to virtually all snow conditions, and is easy to use and to control during many skiing manoeuvers.
  • the twinski 10 comprises an elongated body having an integral mononose 11 and a bifurcated pair of tail sections 12, 13 separated by a slot 9.
  • the twinski 10 includes an upwardly curved forward tip region 14 and a pair of central waist segments 15, 16 and a pair of tail segments 17, 18 optionally providing an outwardly flared tail portion.
  • the tail segments 17, 18 are tied together, in a "floating" manner to be described herein after, by tail bridge structure 19.
  • Each of the four side edges may be provided with a conventional steel wear-resistant edge 20.
  • the underside of the twinski has a running surface 21 of polyethylene, or a similar plastics material, desirably having a longitudinal groove 22 extending from adjacent the forward tip 11 along substantially the full length of the body of each tail section 12, 13. Grooves 22 allow the twinski to unstick from the snow more readily and to reduce friction in running.
  • the tail segments 17, 18 of the twinski are slightly upwardly tapered and preferably the tail segments 17, 18 may be protected by a reinforcing strip 23 of metal or the like.
  • the feet of the skier are held in side-by-side position on the central waist segments 15, 16 of the twinski 10 by any suitable bindings or boot retainers, represented as toe grips 24 mounted on binding plates 25 and heel clamps 26 mounted on binding plates 27.
  • Any suitable bindings or boot retainers represented as toe grips 24 mounted on binding plates 25 and heel clamps 26 mounted on binding plates 27.
  • Many different bindings and quick-release fittings are available, and since they do not form part of this invention, need not be discussed further.
  • Suitable securing means can be incorporated on the twinski 10 where needed.
  • the tail bridge structure 19 comprises a curved tensile steel bar 40 disposed between two retaining members 41.
  • Each retaining member includes a generally rectangular base plate 42 having a support base pedestal 43 thereon. Upstanding from pedestal 43 are a pair of spaced-apart lugs 44 provided with aligned apertures 45.
  • the end plugs 46 of bar 40 are also provided with apertures 47.
  • a hinge pin 48 is mounted through apertures 47, 45 to provide a hinged connection between the base 42 and the bar 40, to allow "floating" interconnection.
  • Base plates 42 are provided with fastening apertures 49 to permit securement of the base plate 42 to the tail segments 17, 18 of the twinski.
  • a second variant of a tail oridge structure 19 includes a horizontal bar structure 60 and a pair of vertical pedestal structures 61.
  • Each pedestal structure includes a plate 62 with an upstanding cylindrical column 63 orocided with an internally tapped bore 64.
  • a threaded post 65 is threadedly secured to bore 64 and to an internally tapped bore 66 in a universal 90 degree connection 67.
  • the effective height of post 65 i.e. the vertical distance between the bottom of plate 62 and the top of connector 67 is controllably adjusted by nut 68.
  • 90 degree universal connector 67 is provided with a spheroidal cup 69 in which a ball joint 70 of a hollow connecting rod 71 is disposed.
  • Rod 71 is provided with an internally tapped bore 72.
  • Universal connectors 67 , connecting rods 71 and a threaded bar 73 constitute the horizontal bar structure 60. The span between the ends of connectors 67 is adjustably controlled by threading bar 73 into tapped bores 72.
  • Base plates 62 are provided with fastening apertures 74 to permit securement of the base plate C2 to the tail segments 17, 18 of the twinski 10.
  • the bridge section includes a pair of.top plates 131, to each of which a pair of spaced-apart ears 132 are integrally provided, e.g. by welding 133.
  • the bridge comprises a circular rod 134, bent into a semi-hoope-like shape, the ends 135 of which are each provided with an aperture 136.
  • the ears are provided with aligned apertures 137.
  • a pin 133 passes through apertures 137, 136 to secure the bridge means 134 to the ears 132.
  • the pin 138 is held in place with a washer/cotter pin arrangement 139.
  • the bridge means 134 is covered with a protective rubber wrapping 140.
  • the tail segment 141 of the twinski is provided with top plate 131, secured to the ski core 142, where a section of the upper skin 143 of the ski has been removed (see Figure 10).
  • a section of the lower skin 144 has also been removed to provide means for insertion of a bottom plate 145.
  • a bolt 146 securing the top plate 131 to the bottom plate 145 passes through the ski core 142 and engages - in tapped holes 147 in the bottom plate.
  • the upper plate is provided with welded-on nuts 148.
  • a screw 149 passes through countersunk holes in the bottom plate 145 to be secured into the nuts 148.
  • FIG. 12 A further variation is shown in Figures 12 and 13.
  • the bottom plate is provided with a pair of ears 152 provided with aligned apertures 156 in the same manner as ears 132.
  • Theears 152 pass through apertures 153 in the upper plate 131.
  • the lower end of bridge means 134 is secured to ears 152 by means of pin 158.
  • the upper plate 131 is provided with suitable locknuts 148, made of fiber material, or any other suitable crown nut.
  • twinski 10 The materials out of which the twinski may be made and typical transverse cross-sections of the tail sections 12, 13 of embodiments of this invention are shown in Figures 1 4 and 15.
  • the core of twinski 10 includes a laminate of edge-glued hickory strips 110, glass fiber sheet 111 and edge-glued strip 112 enveloped with a shett of airplane aluminium 113.
  • the running surface 30 is formed of polytetrafluoroethylene or any other suitable plastics material, having a single groove 22 therein.
  • the lower side edges are provided with steel edges 20.
  • FIG 15 there is shown a hard foam core 121 with a stiffening layer of edge-glued sheet 122, a lower layer of edge-glued ash sheet 123 and lateral ash strips 124 with an envelope of a sheet of fibreglass 125.
  • the running surface 30 is formed of polytetrafluoroethylene or any other suitable plastics material, having a groove 22 (as disclosed in Figure 2) therein.
  • the lower side edges are provided with steel edges 20.
  • the core may be made of aluminium, which is laminated to a facing sheet, e.g. of glass fiber, or of a metal, e.g. airplane aluminium, and then provided with a lower running surface of a plastics material, e.g. polytetrafluoroethylene.
  • each bifurcated tail section may be about 12 mm - 14 mm.
  • the integral mononose tip and the tip region have a uniform thickness of about 80 mm; the thickness may vary to provide a degree of "softness" which can vary for weight variations of skiers.
  • the tip may taper in thickness to provide a softer tip for a 68 kg skier or it may be thicker than about 80 mm, ie.e. it may be greater than 80 mm thick to provide a stiffer tip for a 114 kg skier.
  • the twinski may be from about 180 cm to about 212 cm long.
  • the grooves may be from about 1 mm to 2mm wide and may be about 1 mm deep. They may extend from about 28 cm from the tip of the twinski to the tail edge.
  • the ratio of the length of the integral mononose portion of the bifurcated tail portion generally is 1:5 to 1:6:5, although other proportions are permissible according to this invention.
  • the width of the slot generally varies between about 1/4 and 3/4 of the total average width of the twinski 10. Thus the slot may be wider, the same width or narrower than the width of each of the bifurcated tail sections.
  • the twinski is shorter than a conventional ski and is, on the average, approximately three to four times the width. While the exact dimensions may vary to suit the rider and the required performance characteristics, the basic proportions of a tested efficient ski are given below as typical.
  • the width of the forward tip region is about 12 mm, the width at the central waist are (including tail . sections and slot) is about 21 mm and the width at the tail area (including tail section and slot) is at least about 16.8 cm.
  • the bindings are located about 4.8 cm rearward of the center part of the longitudinal axis. They are set to extend from about 6mm to about 12mm over the lateral edges of the twinski.
  • the grooves commence about 33 cm from the forward tip and continue right through to each of the tail sections.
  • the lateral positioning of the longitudinal grooves is approximately one-half of the width of each tail section and the depth is approximately 18 mm to 28.8 mm.
  • the bottom of the twinski tapers up slightly at the tail portion.
  • the camber of the twinski is greater than that of conventional skis.
  • the length of the longitudinal slot is dependent, to some extent, upon the snow the twinski is adapted to be skied upon.
  • the slot extends a lesser distance into the integral mononose tip than for hard packed snow.
  • some typical dimensions for a twinski particularly adpated to be used in hard packed snow are:
  • the integral mononose section must be made of exceptionally strong material, e.g. a metal, for example, aluminium, in order to withstand the stress build up on the twinski due to the twisting action at the tail segments. Such twisting action is inherent in the "setting" of the edges of the twinski during skiing.
  • the tip be made very strong in order to avoid breakage.
  • the metal integral mononose extend to the bifurcated portion, to a total length of integral mononose of, e.g. 48 cm.
  • the slot converges as it approaches the integral mononose and encroaches a greater distance into the integral mononose.
  • the length of the slot can be varied depending on the material used in the integral mononose region.
  • the slot need not be as long in order to provide a twinski which can twish under skiing conditions to "set" the edges.
  • the slot converges towards the integral mononose section. It will be observed that the slot extends into the mononose section to a lesser extent than for the previously described twinski.
  • the twinski of this invention is capable of being manufactured and therefore being exploited by industy.
  • the twinski is of sufficient width to hold both feet in fairly close side-by-side position in conventional bindings or boot retainers.
  • the twinski has a relatively stiff central waist portion, with a flexible tip region, a flexible, outwardly. flared tail and a maximum bottom camber.
  • the relationship of the width at the tip region, at the waist portion and at the tail portion is important to the performance of the ski.
  • Also essential is the "floating" interconnection of the tail sections. This permits each of the bifurcated tail sections to move vertically independently.
  • the rear spacing of the tail section is adjustable.
  • the turning characteristics of the twinski are altered from that of normal skis. Such characteristics become superior, and it is possible to effect turns uphill more smartly, faster and with greater safety, and to effect turns downhill to the fall line with equally smooth characteristics.
  • the bindings may be set side-by-side or may be moved one slightly ahead of the other. It is preferred, however, that the bindings be set parallel to each other, equidistant from the forward tip and the tail segments.
  • the twinski is simple to ride, and with both feet held fairly close together, there is no tendency for the feet to separate and get out of control in extreme manoeuvers. Very tight pivot turns can be made at substantially any speed without any substantial loss of stability.
  • the turning radius can be as little as one-third of that possible with conventional dual skis.
  • the wide area enables the twinski to plane effectively and to ride high in soft snow, which also facilitates manoeuvering. In a fall, the risk of injury is greatly reduces, since the feet do not fly in different directions, each with a long unwieldy ski attached.
  • bindings are side release bindings of the safety type. They should be set 30 to 40% looser than is the usual practice. In test falls, a skier has been found to come down without discomfort in a sitting position. It is believed that this is due to the characteristics of the twinski in unusual attitudes, and the weight of the skier is essentially towards the rear.
  • advantages of the twinski are extreme manoeuverability, good pivot turnability, controlled turns at all speeds and good support on powder snow and excellent manoeuverability in both packed and corn snow.
  • the four edges provide greater control and the twinski provides a wider stance for balance enabling greater use by a novice.
  • the interconnected tail sections work independently.
  • the twinski is lighter and easier to carry.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Road Paving Structures (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Blinds (AREA)
  • Lasers (AREA)
  • Particle Accelerators (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP79300381A 1978-03-14 1979-03-12 Twinski Withdrawn EP0004713A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA299,045A CA1090385A (en) 1978-03-14 1978-03-14 Twin ski
CA299045 1978-03-14

Publications (2)

Publication Number Publication Date
EP0004713A2 true EP0004713A2 (de) 1979-10-17
EP0004713A3 EP0004713A3 (en) 1979-10-31

Family

ID=4111006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79300381A Withdrawn EP0004713A3 (en) 1978-03-14 1979-03-12 Twinski

Country Status (7)

Country Link
EP (1) EP0004713A3 (de)
CA (1) CA1090385A (de)
DE (1) DE2953026A1 (de)
FR (1) FR2457109A1 (de)
GB (1) GB2043461B (de)
IT (1) IT1148221B (de)
SE (1) SE8004473L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983003554A1 (en) * 1982-04-06 1983-10-27 Hubert Vuignier Snow ski-surf or mono-ski
WO1995015794A1 (en) * 1993-12-10 1995-06-15 Nordica S.P.A. Ski or snowboard with improved gliding
RU215408U1 (ru) * 2022-04-04 2022-12-12 Дмитрий Владимирович Вихорев Устройство для прыжка с трамплина

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501515A1 (fr) * 1981-03-12 1982-09-17 Grange Ulysse Dispositif permettant de rendre deux skis solidaires en les maintenant reunis cote a cote
FR2521864A1 (fr) * 1982-02-19 1983-08-26 Dayde Thierry Planche a glisser
DE3522373A1 (de) * 1985-06-22 1987-01-02 Rainer Gebert Vorrichtung fuer eine parallele fuehrung von zwei skiern
GB8703801D0 (en) * 1987-02-18 1987-03-25 Sadler S Board

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH484682A (de) * 1969-03-13 1970-01-31 Muggli Robert Vorrichtung zur Parallelführung eines Skipaares
US3549162A (en) * 1968-11-27 1970-12-22 Harold Y Coutts Ski construction
AT340812B (de) * 1976-03-24 1978-01-10 Richard Thurnbichler Schiartiges sportgerat
DE2704858A1 (de) * 1977-02-05 1978-08-10 Martin Hilleprandt Ski, insbesondere zur verwendung fuer tiefschneeabfahrten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549162A (en) * 1968-11-27 1970-12-22 Harold Y Coutts Ski construction
CH484682A (de) * 1969-03-13 1970-01-31 Muggli Robert Vorrichtung zur Parallelführung eines Skipaares
AT340812B (de) * 1976-03-24 1978-01-10 Richard Thurnbichler Schiartiges sportgerat
DE2704858A1 (de) * 1977-02-05 1978-08-10 Martin Hilleprandt Ski, insbesondere zur verwendung fuer tiefschneeabfahrten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983003554A1 (en) * 1982-04-06 1983-10-27 Hubert Vuignier Snow ski-surf or mono-ski
WO1995015794A1 (en) * 1993-12-10 1995-06-15 Nordica S.P.A. Ski or snowboard with improved gliding
RU215408U1 (ru) * 2022-04-04 2022-12-12 Дмитрий Владимирович Вихорев Устройство для прыжка с трамплина

Also Published As

Publication number Publication date
GB2043461A (en) 1980-10-08
FR2457109A1 (fr) 1980-12-19
SE8004473L (sv) 1980-06-17
DE2953026A1 (de) 1981-03-26
IT1148221B (it) 1986-11-26
EP0004713A3 (en) 1979-10-31
CA1090385A (en) 1980-11-25
GB2043461B (en) 1982-12-15
IT8086263A0 (it) 1980-07-11

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Inventor name: PEDERSEN, ALEC