US3861699A - Ski construction - Google Patents

Ski construction Download PDF

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Publication number
US3861699A
US3861699A US383988A US38398873A US3861699A US 3861699 A US3861699 A US 3861699A US 383988 A US383988 A US 383988A US 38398873 A US38398873 A US 38398873A US 3861699 A US3861699 A US 3861699A
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US
United States
Prior art keywords
ski
core member
tubular elements
longitudinally extending
corrugations
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.)
Expired - Lifetime
Application number
US383988A
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English (en)
Inventor
Arpad A Molnar
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.)
MOLNAR A ART
Original Assignee
Molnar and Co Inc
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 Molnar and Co Inc filed Critical Molnar and Co Inc
Priority to US383988A priority Critical patent/US3861699A/en
Priority to CH936074A priority patent/CH582008A5/xx
Priority to DE2433673A priority patent/DE2433673C3/de
Priority to FR7426328A priority patent/FR2239265A1/fr
Priority to CA205,630A priority patent/CA1014184A/en
Priority to AT616074A priority patent/AT338669B/de
Priority to JP49086833A priority patent/JPS5042931A/ja
Application granted granted Critical
Publication of US3861699A publication Critical patent/US3861699A/en
Assigned to MOLNAR, A. ART reassignment MOLNAR, A. ART ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MOLNAR SKI CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A63C5/12—Making thereof; Selection of particular materials

Definitions

  • ABSTRACT A ski construction is characterized by a longitudinally extending fiber-reinforced plastic honeycomb core having hollow tubular members and upperand lower foam-filled corrugations. Plastic sides for the ski are locked into longitudinally extending sockets along the side edges of the honeycomb core and a plastic top covers the honeycomb core. An epoxy or phenolic binder bonds a bottom running surface of the ski to the honeycomb core and the elasticity of the binder determines the dampening characteristics of the ski,
  • PATENTEDJAHZ I975 sum ear 2 SKI CONSTRUCTION
  • the present invention relates generally to board construction for recreational equipment and more particularly to a new and improved snow ski construction.
  • a good snow ski combines a rather delicate balance between rigidity and flexibility, while maintaining other important characteristics such as torsional response and vibration dampening. While originally, wood was the best known material for obtaining the desired characteristics, more recently, it has been found that plastic or fiber reinforced plastic can be used to obtain the desired characteristics and at the same time extend the useful life of the ski.
  • Typical plastic or fiberglass skis have required the use of continuous metal, plastic or fiber reinforced plastic strips along the top and bottom of the core of the ski in addition to the outer covering of the ski to give the desired rigidity and flexibility balance but due to metal fatigue, the life of these skis is also unnecessarily limited.
  • an object of the present invention to provide a new and improved ski construction giving a desirable balance between rigidity and flexibility while maintaining a prolonged life of the ski.
  • the ski construction of the present invention has a honeycomb core defining hollow longitudinally extending tubular passages and upwardly and downwardly opening longitudinally extending corrugations with the corrugations being filled with a foam material, the elasticity of which determines the torsional response of the ski.
  • the honeycomb core is made of a fiber reinforced plastic material and consists of symmetrical corrugated sheets. The sheets are bonded together with an adhesive medium to establish the tubular passages and by varying the thickness of the adhesive medium, the balance between rigidity and flexibility of the ski is controlled.
  • the running base and running edges of the ski are bonded to the core by a bonding medium, the elasticity of which determines the vibration dampening characteristics of the ski.
  • Abrasion-resistant sides are positively locked in longitudinal sockets extending along opposite sides of the honeycomb core and an abrasion resistant top covers the top surface of the core whereby the core of the ski is completely sealed.
  • FIG. 1 is an exploded perspective view of the ski construction of the present invention with parts removed for clarity,
  • FIG. 2 is a side elevation of a ski constructed in accordance with the present invention
  • FIG. 3 is an enlarged vertical section taken along line 33 of FIG. 2,
  • FIG. 4 is an enlarged vertical section taken along line 44 of FIG. 2,
  • FIG. 5 is a vertical section taken along line 5--5 of FIG. 3,
  • FIG. 6 is a transverse vertical section taken through a ski incorporating a second embodiment of the present invention.
  • FIG. 7 is a transverse vertical section taken through a ski incorporating a third embodiment of the present invention.
  • the component parts of the ski construction 10 of the present invention are probably best seen in FIG. 1 to include a honeycomb core 12, an abrasion resistant top 14, side wall elements 16, a bottom running element l8 and running edges 20 which are integrally connected in a manner to be described hereinafter to comprise a ski construction in which the desired balance between rigidity and flexibility, the desired torsional response, and the desired dampening characteristics can be obtained.
  • each component of the'ski is bowed in a longitudinal direction to give the ski the desired camber.
  • each hollow element 22 has a hexagonal transverse cross-sectional configuration.
  • the top and bottom walls 24 and 26 respectively of the tubular elements 22 are preferably thicker than the side walls 27 of the elements so that the hollow passages through the elements are somewhat flattened.
  • the tubular elements 22 are connected together by horizontal planar web elements 28 which are comparable in overall thickness to the top and bottom walls of the tubular elements 22 so that upwardly and downwardly opening trough-shaped corrugations 29 of trapezoidal crosssection are established between the tubular elements.
  • retention sockets 30 are defined by a channel which resembles a half-portion of a tubular element 22 with inturned lips 32 terminating in spaced relationship to each other so that the sockets 30 open outwardly through the side of the core member 12.
  • the core member 12 is thicker at its longitudinal center than at opposite ends so that the top and bottom surfaces of the core member converge in a forward and rearward direction from the approximate longitudinal center of the core member whereby at the extreme leading and trailing ends, 34 and 36 respectively, of the core memher, the tubular elements 22 and corrugations 29 are eliminated.
  • the core member arches upwardly defining the leading tip of the ski.
  • the core 12 is preferably made of a fiber-reinforced plastic with the plastic being a resin such as epoxy, polyester or vinylester and the reinforcement fibers being fibrous glass, boron, sapphire, carbon, graphite, ceramic or combinations of these materials.
  • the honeycomb core 12 is preferably constructed from upper and lower identical corrugated sheets 38a and 38b which are bonded in opposed face-to-face relationship and in a symmetrical manner to establish the honeycomb construction hereinbefore described.
  • Each sheet can be seen to have corrugations on opposite sides so that when the sheets are bonded together, the tubular elements 22 and upwardly and downwardly opening corrugations 29 of the core member 12 are established.
  • the corrugated sheets are bonded along their interface 40 with an epoxy resin or similar bonding medium 41 and by varying the thickness of the bonding medium 41 it has been found that the balance between rigidity and flexibility desired for the ski can be varied. In other words, the greater the thickness of the bonding medium, the more rigid the ski becomes and conversely, the thinner the bonding medium, the more flexible the ski becomes.
  • the corrugations 29 defined between the tubular elements 22 of the core 12 which open both upwardly and downwardly, are filled with an elastic semi-flexible foam material 42 such as a synthetic polyurethane, epoxy, or syntactic foam and the elasticity of the foam will determine the torsional response of the ski.
  • an elastic semi-flexible foam material 42 such as a synthetic polyurethane, epoxy, or syntactic foam and the elasticity of the foam will determine the torsional response of the ski.
  • a high torsional response can be obtained with a high degree of elasticity in the foam material 42 while a lower degree of elasticity in the foam material would lessen the torsional response.
  • the side wall elements 16 of the ski are positively retained in the longitudinal sockets 30 along the sides of the core member 12 and are preferably made of a polyurethane, polyethylene, polysulfone, foam and/or a syntactic foam, or acrylonitrile-butadiene-styrene, commonly referred to as ABS. Any of these materials provide an abrasion resistant, water-proof external side sufrace for the ski to assure a long life.
  • the top edges of the side wall elements 16 are flush with the top surface of the honeycomb core 12 and with the foam material 41 in the corrugations 29 of the core whereby the top surface of the core is easily covered by the top element 14 to seal the core member.
  • the top element 14 of the ski is preferably a polyurethane lacquer but could also be a sheet of polyurethane or ABS bonded to the core to provide an abrasion-resistant, waterproof top surface for the ski.
  • the running edges of the ski are conventional and comprise elongated metallic strips of inverted L-shaped cross-section having a longitudinal groove 43 in the undersurface thereof adapted to receive the bottom running element 18 of the ski which fits flush with the running edges 20 to define a smooth bottom surface of the ski.
  • the running edges 20 and bottom running element 18 of the ski are bonded to the foam-filled core by a bonding medium 44 which fills a hollow cavity 45 defined between the bottom element, running edges and the core member.
  • This bonding medium 44 is preferably a phenolic adhesive, a glass-reinforced epoxy or polyurethane, a polyester or polyurethane.
  • the elasticity of the bonding medium 44 determines the dampening characteristics of the ski, or in other words, the ability of the ski to absorb vibration or chatter. Accordingly, the dampening characteristics of the ski are also variable upon construction of the ski.
  • the bottom running element 18 of the ski is preferably made of a high-density polyethylene material such as a material marketed under the name P-tex by lnter Montana Sports in Switzerland.
  • the lower surface of the bottom running element 18 has a longitudinally extending groove 46 which enhances the tracking ability of the ski and the leading end 48 of the bottom running element 18 is curved upwardly to conform with the leading end of the core in defining the leading tip of the ski.
  • a mounting plate 50 preferably of aluminum, FIGS. 2, 4 and 5 is inserted into recessed cavities formed in the opposing faces of the corrugated sheets 38a and 38b defining the honeycomb'core 12.
  • the mounting plate 50 is, of course, held in place by the bonding medium 41 joining the corrugated sheets whereby it is totally integrated into the ski.
  • the mounting plate provides a strong anchoring base for bindings 52, FIG. 2, to be-mounted on the ski whereby metal screws 54 can be used to anchor the bindings to the ski in a positive and reliable manner.
  • the two corrugated sheets 38a and 38b would first be bonded in abutting facing relationship with the appropriate thickness of bonding material 41 to give the balance between rigidityand flexibility desired for the particular ski.
  • the corrugations 29 in the upper-and lower surfaces of the core member 12 would be filled with the foam material 42 having an elasticity dependent upon the torsional response desired for the ski.
  • the sides 16 of the ski would then be molded or injected into the retention sockets 30 along the sides of the core member to take the desired configuration'so that the integrated foam-filled core member with the sides as a part thereof could be placed into a form or jig in which the bottom running element 18 and running edges 20 were prealigned.
  • the bonding medium 44 would have been filled in the cavity between the bottom element and the core so that the core could be clamped against the running edges and bottom element causing the bonding medium 44 to be squeezed outwardly between the running edges and the core to positively secure the running edges as well as the bottom running element.
  • the elasticity of the bonding material 44 between the core and the bottom element determines the dampening characteristics of the ski and this too would be selected for the particular ski being manufactured.
  • the top element 14 of the ski would be incorporated thereonto either by applying the polyurethane lacquer or by bonding the sheet of polyurethane or ABS in a conventional manner.
  • FIG. 6 another embodiment S5 of the invention is illustrated wherein there are four longitudinally extending tubular elements 56 of hexagonal transverse cross-section as opposed to the three elements 22 disclosed in the first described embodiment. Otherwise, the ski disclosed in FIG. 6 would be identical to the previously described ski and it is to be understood that any number of hexagonal tubular elements could be utilized.
  • FIG. 7 still another embodiment 58 of the ski construction of the present invention is shown wherein the tubular elements 60 are generally circular in crosssection with flattened top and bottom surfaces 62.
  • the core element of this embodiment could be manufactured by an extrusion process and in addition to the two-part core illustrated, the core could be extruded in a single piece.
  • a recreational board construction comprising in combination:
  • an elongated core member including hollow tubular elements with connecting web elements retaining the tubular elements in parallel spaced relationship, elongated open corrugations between said tubular elements,
  • a ski comprising in combination:
  • an elongated core member including longitudinally extending hollow tubular elements with connecting web elements retaining the tubular elements in parallel spaced relationship, longitudinally extending open corrugations between the tubular elements,
  • said core member is comprised of a pair of corrugated sheets disposed in opposed facing relationship so as to define the longitudinally extending tubular elements and open corrugations, and further including a layer of bonding material between the corrugated sheets securing the corrugated sheets in facing relationship.
  • said core member further includes open socket portions along opposite sides thereof, and sidewall members retained in said socket portions to extend along the length of the core memher.
  • the ski of claim 8 further including a metal plate between the corrugated sheets extending along a limited portion of the length of the corrugated sheets at the approximate longitudinal center of the corrugated sheets.
  • tubular elements are of substantially circular transverse cross-section.
  • a ski construction comprising in combination:
  • an elongated fiber reinforced semi-rigidplastic core member having a pair of corrugated sheets disposed in opposed facing relationship and defining a plurality of longitudinally extending hollow tubular elements of hexagonal transverse cross-section with integral connecting web elements retaining the tubular elements in parallel spaced relationship and a plurality of longitudinally extending corruga-v tions between the tubular elements, the longitudinal side edges of the core member having continuous longitudinally extending sockets opening through the side of the core member,
  • thermal plastic sidewall members received in said longitudinally extending sockets of the core member

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  • Laminated Bodies (AREA)
US383988A 1973-07-30 1973-07-30 Ski construction Expired - Lifetime US3861699A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US383988A US3861699A (en) 1973-07-30 1973-07-30 Ski construction
CH936074A CH582008A5 (fr) 1973-07-30 1974-07-08
DE2433673A DE2433673C3 (de) 1973-07-30 1974-07-12 Ski
FR7426328A FR2239265A1 (fr) 1973-07-30 1974-07-24
CA205,630A CA1014184A (en) 1973-07-30 1974-07-25 Ski with core of longitudinally extending tubes and webs
AT616074A AT338669B (de) 1973-07-30 1974-07-26 Ski
JP49086833A JPS5042931A (fr) 1973-07-30 1974-07-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US383988A US3861699A (en) 1973-07-30 1973-07-30 Ski construction

Publications (1)

Publication Number Publication Date
US3861699A true US3861699A (en) 1975-01-21

Family

ID=23515575

Family Applications (1)

Application Number Title Priority Date Filing Date
US383988A Expired - Lifetime US3861699A (en) 1973-07-30 1973-07-30 Ski construction

Country Status (7)

Country Link
US (1) US3861699A (fr)
JP (1) JPS5042931A (fr)
AT (1) AT338669B (fr)
CA (1) CA1014184A (fr)
CH (1) CH582008A5 (fr)
DE (1) DE2433673C3 (fr)
FR (1) FR2239265A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118051A (en) * 1976-12-17 1978-10-03 Nissei Plastics Industrial Co., Ltd. Injection molded ski and method for producing the same
US4293142A (en) * 1979-07-16 1981-10-06 K-2 Corporation Vibration damped ski
US4731038A (en) * 1985-05-01 1988-03-15 Kendal Hancock Preformed core and molded product and method of manufacture
US4928989A (en) * 1987-12-09 1990-05-29 Head Sportgeraete Gesellschaft M.B.H. & Co. Ohg Ski having a core comprising angled profiles
US4949996A (en) * 1989-02-28 1990-08-21 Mcnally Mark H Ski equipment including a mirror panel attachment
US5232241A (en) * 1992-02-24 1993-08-03 K-2 Corporation Snow ski with integral binding isolation mounting plate
US20030222420A1 (en) * 2002-06-01 2003-12-04 Hadzicki David Herbert Composit sport board
US20040222609A1 (en) * 2003-05-07 2004-11-11 Schmitt Paul G. Waffled wood core skateboard
WO2005092453A1 (fr) * 2004-03-25 2005-10-06 Kneissl Tirol Gmbh Ski, notamment ski de fond ou ski alpin
US20060142184A1 (en) * 2002-06-20 2006-06-29 Pacific Biolink Pty Limited Protein based oral lubricant
US9456590B2 (en) * 2004-10-22 2016-10-04 Crucible Intellectual Property, Llc Amorphous alloy hooks and methods of making such hooks

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT397916B (de) * 1992-01-14 1994-08-25 Isosport Verbundbauteile Verfahren zum herstellen eines skibauteils sowie skibauteil und dessen verwendung
AT405023B (de) * 1992-03-23 1999-04-26 Wolfgang Lehner Ski
AT405022B (de) * 1992-03-23 1999-04-26 Wolfgang Lehner Ski
US5848800A (en) * 1993-06-09 1998-12-15 Kastle Aktiengesellschaft Ski
DE4325091A1 (de) * 1993-07-27 1995-02-02 Uwe Emig Aus mehreren Elementen zusammengesetzter Ski
FR2863901A1 (fr) * 2003-12-18 2005-06-24 Skis Dynastar Planche de glisse sur neige a renfort interne et procede de fabrication

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736609A (en) * 1971-04-05 1973-06-05 Compo Tek Corp Laminated water ski

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736609A (en) * 1971-04-05 1973-06-05 Compo Tek Corp Laminated water ski

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118051A (en) * 1976-12-17 1978-10-03 Nissei Plastics Industrial Co., Ltd. Injection molded ski and method for producing the same
US4293142A (en) * 1979-07-16 1981-10-06 K-2 Corporation Vibration damped ski
US4731038A (en) * 1985-05-01 1988-03-15 Kendal Hancock Preformed core and molded product and method of manufacture
US4928989A (en) * 1987-12-09 1990-05-29 Head Sportgeraete Gesellschaft M.B.H. & Co. Ohg Ski having a core comprising angled profiles
US4949996A (en) * 1989-02-28 1990-08-21 Mcnally Mark H Ski equipment including a mirror panel attachment
US5232241A (en) * 1992-02-24 1993-08-03 K-2 Corporation Snow ski with integral binding isolation mounting plate
US20030222420A1 (en) * 2002-06-01 2003-12-04 Hadzicki David Herbert Composit sport board
US20040183269A1 (en) * 2002-06-01 2004-09-23 Hadzicki David Herbert Composite sport board
US20060142184A1 (en) * 2002-06-20 2006-06-29 Pacific Biolink Pty Limited Protein based oral lubricant
US20040222609A1 (en) * 2003-05-07 2004-11-11 Schmitt Paul G. Waffled wood core skateboard
US20050115470A1 (en) * 2003-05-07 2005-06-02 Schmitt Paul G. Waffled wood core skateboard
US20050115471A1 (en) * 2003-05-07 2005-06-02 Schmitt Paul G. Waffled wood core skateboard
US20050109248A1 (en) * 2003-05-07 2005-05-26 Schmitt Paul G. Waffled wood core skateboard
US7736722B2 (en) 2003-05-07 2010-06-15 Schmitt Paul G Waffled wood core skateboard
WO2005092453A1 (fr) * 2004-03-25 2005-10-06 Kneissl Tirol Gmbh Ski, notamment ski de fond ou ski alpin
US9456590B2 (en) * 2004-10-22 2016-10-04 Crucible Intellectual Property, Llc Amorphous alloy hooks and methods of making such hooks

Also Published As

Publication number Publication date
JPS5042931A (fr) 1975-04-18
AT338669B (de) 1977-09-12
FR2239265A1 (fr) 1975-02-28
DE2433673B2 (de) 1979-05-03
CA1014184A (en) 1977-07-19
ATA616074A (de) 1976-12-15
CH582008A5 (fr) 1976-11-30
DE2433673C3 (de) 1980-01-03
DE2433673A1 (de) 1975-02-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MOLNAR, A. ART 145 W. ELM ST., L+OUISVILLE, CO 800

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MOLNAR SKI CORPORATION;REEL/FRAME:004384/0766

Effective date: 19850401