CA1106864A - Ski and its manufacture - Google Patents
Ski and its manufactureInfo
- Publication number
- CA1106864A CA1106864A CA334,021A CA334021A CA1106864A CA 1106864 A CA1106864 A CA 1106864A CA 334021 A CA334021 A CA 334021A CA 1106864 A CA1106864 A CA 1106864A
- Authority
- CA
- Canada
- Prior art keywords
- ski
- rear end
- continuous belt
- belt
- core material
- 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
Links
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- Laminated Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout sub-stantially the entire length of the ski, the improvement com-prising a continuous belt of fiber-glass reinforced laminate bonded to a polyethylene surface layer, which belt forms both the upper and lower surfacing material and which is bent around the core material so that the polyethylene layer forms the bottom running surface as well as the upper surface, the belt further forming an integral guard around the core material of the rear end of the ski.
An improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout sub-stantially the entire length of the ski, the improvement com-prising a continuous belt of fiber-glass reinforced laminate bonded to a polyethylene surface layer, which belt forms both the upper and lower surfacing material and which is bent around the core material so that the polyethylene layer forms the bottom running surface as well as the upper surface, the belt further forming an integral guard around the core material of the rear end of the ski.
Description
BACKGROUND OF THE INYENTION
At the present time sk;s are primarily manufactured by one of two manufacturing methods: the injection method or the sandwich method. In both these methods the finished product is a ski having an upper belt and a lower belt which are separated ¦~
by, and affixed to, a core material throughout substantially the !
entire length of the ski. The belts are usually polymeric lam;nates, often with fiber-glass reinforcement and preferably have an outer layer of hard cover material, such as polyethylene, which become the top and bottom surfaces of the finished ski.
The core material may be wood or a suitable synthetic foam.
In the injection method the upper and lower belts are placed into a mold, and the hollow space remaining between the~
is filled-in with foam of a suitable synthetic material which adheres to the belts. This method is shown schematically in cross-section in Fig. 1.
In the sandwich method the upper and lower belts are glued under pressure to a cone made of wood or pre-hardened foam, sometimes also providing for air chambers. This mode of construction is shownschematically ;n cross-section in Fig. 2.
Skis manufactured under either method described above necessarily have the disadvantage of the core material between the upper and lower belts being exposed unprotected in the open at the rear ends of the ski. Since the core materials are sof:er in case of foams and more brittle in the case of wooden cores mechanical damage often occures at this juncture and particula~ly' when the skis are positioned upright on the ground. These pro~-lems coupled with inert deficiencies of bonded surfaces often results in spliting at the rear end of the ski.
.1 ~ ' ., --2--.
~ - .
i To correct this considerable sl,or-:coming in use, special rear end protectors have been employed u r until now; they are either placed into the mold before the filling-in with foam or they are glued or screwed on to the rear end of the ski after proper preparation of the rear end of the ski such as milling-out. In any case, however, such rear end protectors require a separate assembly procedure with either the injection or sandwich methods. By the use of such rear end protectors the !
problem of durable protection is handled unsatisfactorily, as only a purely mechanical connection exists between the core and the rear end protectors, so that the rear ends of the ski may still be split or wedged apart by bumping or through high stress.
SUMMARY OF THE INVENTION
Our invention relates to an improved snow ski and the methods of producing such an improved ski. In particular, our invention concerns the manufacture of skis having integrated rear end guards not requiring an additional assembly step9 where-by the ski may have an upper surface layer and a bottom running surface layer, formed from one continuous belt of material.
We have discovered that a single coherent piece of belting¦
material may be used to surround the core material and form a "U" around the rear end of the ski. The upper- and lower belts thus do not represent two independent building parts, but become ; each other at the transition spot located at the U-bend. Accord-ing to the invention a ski with integrated rear end guard is produced, the rear end of which is protected from core damage ¦ and spliting.
i The methods we disclose herein are technically -simple, efficient, and economical; the standard equipment used in either I the injection or sandwich methods of constructing skis may be employed without additional assembly steps. At the same time ~I 3 !
6i4 uncler our improved method less belting material is wasted.
In accordance with a particular embodiment of the invention, there is provided an improved ski, having an upper surfacing material and a lower surfacing material the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire length of the ski, the improvement comprising a continuous belt material which forms the upper and lower surfaces and which is formed around the core material at the rear of the ski to form an integral rear end guard.
In accordance with a further embodiment of the invention, there is provided an improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire léngth of the ski, the improvement comprising a continuous belt material of fiber-glass reinforced laminate bonded to a polyethylene surface layer, which belt material forms both the upper and lower sur-facing material and which is bent around the core material at the rear end of the ski, so that the polyethylene layer forms the bottom running surface, as well as the upper surface, the belt material further forming an integral guard around the core material at the rear end of the ski.
From a different aspect, and in accordance with the invention, the method of constructing an improved ski using - an injection type, ski fabricating, mold, comprises the follow-ing steps: a) placing a U-shaped continuous belt into the mold, b) sealing the mold with the exception of an air vent and an injection port' c) injecting through said injection port and between the upper and lower portions of the U-shaped continuous belt, a suitable, synthetic, self adhesive, foam material, ' d) hardening said self-adhesive foam material whereby it ad-heres to the U-shaped continuous belt to form an improved ski having an integral rear end guard.
In accordance with a further embodiment of the invention, in accordance with the second aspect, the method of constructing an improved ski using a sandwich press and adhesive, comprises: a) securing a suitable core material to a U-shaped continuous belt with a layer of adhesive separating the core material from the belt to form a sandwich, b) placing the sandwich of core, adhesive and belting materials into a sandwich press and applying pressure, and c) removing from the press after the adhesive has set a rough formed ski having an integral rear end guard.
Our invention will be described and illustrated in connection with certain preferred embodiments although it is recognized that various modifications may be made without de-parting from the spirit and scope of our invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an illustrative cross-sectional view of the prior art ski manufacturing method known as the injection method.
Fig. 2 is an illustrative cross-sectional view of the prior art ski manufacturing method known as the sandwich method.
Fig. 3 is a ski according to our invention in long-itudinal section.
Fig. 4a-c are longitudinal sections of alternate embodiments of the unitary belting material.
Fig. 5 is a detailed longitudinal sectional view of the belting material at the rear end of the ski.
DESCRIPTIO~ OF THE EMBODIMENTS
Figs. 1 and 2 illustrate the two standard methods of manufacturing skis at present. In the injection method, which - 4a -,~; ,~,.
~S~ 6~
is shown in Fig. 1, a mold 4 is used to fabricate a ski. The upper belt 1 and lower belt 2 are placed in the mold and the mold is closed. An injection port (not shown) injects a suit-able synthetic foam material 3 between the two belts until the mold is filled. The foam 3 includes an adhesive which, upon drying, caused the two belts to be firmly affixed to the foam CorQ. Once the foam has solidified, the mold 4 is opened and the ski removed. One advantage of the injection method is that the mold can impart to the ski a finished contour, including a curled tip and central camber, without the need for additional cutting or bending. As mentioned previously, however, the - 4b -`
6~
Ii I
¦ traditional ski manufactured by the injection method still suffers from the defect of having the core exposed at the rear end, the additional step of attaching a rear end guard is required. I
In the sandwich method, shown in Fig. 2, the upper belt 1 ¦
and the lower belt 2 are bonded to a core 3 made from wood or pre-hardened foam. The layers are bonded together by any suit-able adhesive 5 under pressure. In some instances air chambers are provided to make the ski lighter or more flexible. The ski produced in this manner is typically rectangular and subsequent cutting and bending are necessary to arrive at the final ski form. Once again the ski suffers from the defect of having an exposed core at the rear end. Typically the rear end of the ski is milled after the ski has been pressed, trimed and shaped.
Once the end has been milled, a properly sized guard piece is glued or screwed onto the rear end of the ski.
In Fig. 3 a version of the ski according to the invention is shown in longitudinal section with exaggerated heights; a single, continuous strip of belting material forms an upper belt portion 1 and a lower belt portion 2 surrounding the core 3. Any additional layer that may be present is not shown in the sche-matic picture. The inner distance between upper belt 1 and lower belt 2 in a typical ski is in area A 1 to 2 mm, in area B 1.0 to 1.5 mm, in area C approximately 25 mm and in area D appr. 2 mm.
Fig. 4 shows the preferred construction of the belting ¦ material. In the preferred embodiment the belting material com-l prises a bonded to a hard synthetic layer, which serves as the ¦l ~external layer. In the finish product this external layer forms ~¦ the bottom running surface as well as the upper surface and rear ¦¦ end guard. Durability is a prime consideration in selecting the I external layer; for this reason materials such as polyethylene I!
6~36~
11l 1 I are preferred. Fig. 4a shows a typical configuration of the ¦ bel1;ing material i n schematic longitudinal sec~ion. In this ¦ embt)diment a fiberglass laminate 6 is bonded to a polyethylene ¦ layer 7. Fig. 4b shows one embodiment of the ContinuouS Strip i I of belting material wherein tWo Segments Of the fiberglass la~i-nate have been milled out to permit easy bending in the direction of the arrows. In Fig. 4 c an alternative embodiment is shown wherein two pressed spotS have been formed in the fiberglass la~inate by compression, again to permit easy bending.
With the manufacture of the Ski it is preferable that tne ¦ notched, cut-into, milled-out or compres~-d spots correspond to the later thickness Of the ski Core (Fig 4). It is also pref-erable that when cutting or~ milling (Fig. 4b) only the fiberglass laminate, and not the external surface layer be CUt.
With proper selection of dimensioning and materials it iS
however also possible to bend the bonded material hot, without previous preparation of the planned bending edges. According to the invention bending may be done with the aid of a bending gzge or a simple bending press. When the injection method iS followed ¦ the fact, that the two pieces, constituting the upper- and low~r belts, are connected, additionally facilitates adjustment of tne pieces in the form.
In Fig. 5 the bending of the belting material in area r of Fig. 3 is shown enlarged schematically; with thick laminates ! the shaping of the rear end edges is improved by previous preF-aration of the bending edges (arrows) through one of the proc~-dures mentioned above.
l~ The ski according to the invention features several ¦l advantages in manufacture and uSe when compared with skis of I conventional construction The possibility of prefabricatiny the l; , 1~ 686~ ~
upper- and lower belts in one single piece, including prepared bending edges when necessary, allows savings of material and therefore a more economic and more effic;ent production; furth-r-more, the additional step of installing the rear end guard is eliminated.
The preferred use of a strip of one kind of bonded material to produce the upper- and lower belts leads to the result, that the upper surface of the ski has the same properties as the running surface. Especially with cross country skis, this has the adYantage, that, because of the high apolarity and the excellent gliding properties, no snow or ice accumulates on the upper surface of the ski. At the same time, the upper and the lower surfaces may be printed on in any design desired, and the surface then sealed with a transparent layer, which results in a completely wear-proof design.
The integrated rear end guards produced, according to the inYention, result in a far greater stability and resistance to wear and tear of the rear ends of the skis.
At the present time sk;s are primarily manufactured by one of two manufacturing methods: the injection method or the sandwich method. In both these methods the finished product is a ski having an upper belt and a lower belt which are separated ¦~
by, and affixed to, a core material throughout substantially the !
entire length of the ski. The belts are usually polymeric lam;nates, often with fiber-glass reinforcement and preferably have an outer layer of hard cover material, such as polyethylene, which become the top and bottom surfaces of the finished ski.
The core material may be wood or a suitable synthetic foam.
In the injection method the upper and lower belts are placed into a mold, and the hollow space remaining between the~
is filled-in with foam of a suitable synthetic material which adheres to the belts. This method is shown schematically in cross-section in Fig. 1.
In the sandwich method the upper and lower belts are glued under pressure to a cone made of wood or pre-hardened foam, sometimes also providing for air chambers. This mode of construction is shownschematically ;n cross-section in Fig. 2.
Skis manufactured under either method described above necessarily have the disadvantage of the core material between the upper and lower belts being exposed unprotected in the open at the rear ends of the ski. Since the core materials are sof:er in case of foams and more brittle in the case of wooden cores mechanical damage often occures at this juncture and particula~ly' when the skis are positioned upright on the ground. These pro~-lems coupled with inert deficiencies of bonded surfaces often results in spliting at the rear end of the ski.
.1 ~ ' ., --2--.
~ - .
i To correct this considerable sl,or-:coming in use, special rear end protectors have been employed u r until now; they are either placed into the mold before the filling-in with foam or they are glued or screwed on to the rear end of the ski after proper preparation of the rear end of the ski such as milling-out. In any case, however, such rear end protectors require a separate assembly procedure with either the injection or sandwich methods. By the use of such rear end protectors the !
problem of durable protection is handled unsatisfactorily, as only a purely mechanical connection exists between the core and the rear end protectors, so that the rear ends of the ski may still be split or wedged apart by bumping or through high stress.
SUMMARY OF THE INVENTION
Our invention relates to an improved snow ski and the methods of producing such an improved ski. In particular, our invention concerns the manufacture of skis having integrated rear end guards not requiring an additional assembly step9 where-by the ski may have an upper surface layer and a bottom running surface layer, formed from one continuous belt of material.
We have discovered that a single coherent piece of belting¦
material may be used to surround the core material and form a "U" around the rear end of the ski. The upper- and lower belts thus do not represent two independent building parts, but become ; each other at the transition spot located at the U-bend. Accord-ing to the invention a ski with integrated rear end guard is produced, the rear end of which is protected from core damage ¦ and spliting.
i The methods we disclose herein are technically -simple, efficient, and economical; the standard equipment used in either I the injection or sandwich methods of constructing skis may be employed without additional assembly steps. At the same time ~I 3 !
6i4 uncler our improved method less belting material is wasted.
In accordance with a particular embodiment of the invention, there is provided an improved ski, having an upper surfacing material and a lower surfacing material the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire length of the ski, the improvement comprising a continuous belt material which forms the upper and lower surfaces and which is formed around the core material at the rear of the ski to form an integral rear end guard.
In accordance with a further embodiment of the invention, there is provided an improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire léngth of the ski, the improvement comprising a continuous belt material of fiber-glass reinforced laminate bonded to a polyethylene surface layer, which belt material forms both the upper and lower sur-facing material and which is bent around the core material at the rear end of the ski, so that the polyethylene layer forms the bottom running surface, as well as the upper surface, the belt material further forming an integral guard around the core material at the rear end of the ski.
From a different aspect, and in accordance with the invention, the method of constructing an improved ski using - an injection type, ski fabricating, mold, comprises the follow-ing steps: a) placing a U-shaped continuous belt into the mold, b) sealing the mold with the exception of an air vent and an injection port' c) injecting through said injection port and between the upper and lower portions of the U-shaped continuous belt, a suitable, synthetic, self adhesive, foam material, ' d) hardening said self-adhesive foam material whereby it ad-heres to the U-shaped continuous belt to form an improved ski having an integral rear end guard.
In accordance with a further embodiment of the invention, in accordance with the second aspect, the method of constructing an improved ski using a sandwich press and adhesive, comprises: a) securing a suitable core material to a U-shaped continuous belt with a layer of adhesive separating the core material from the belt to form a sandwich, b) placing the sandwich of core, adhesive and belting materials into a sandwich press and applying pressure, and c) removing from the press after the adhesive has set a rough formed ski having an integral rear end guard.
Our invention will be described and illustrated in connection with certain preferred embodiments although it is recognized that various modifications may be made without de-parting from the spirit and scope of our invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an illustrative cross-sectional view of the prior art ski manufacturing method known as the injection method.
Fig. 2 is an illustrative cross-sectional view of the prior art ski manufacturing method known as the sandwich method.
Fig. 3 is a ski according to our invention in long-itudinal section.
Fig. 4a-c are longitudinal sections of alternate embodiments of the unitary belting material.
Fig. 5 is a detailed longitudinal sectional view of the belting material at the rear end of the ski.
DESCRIPTIO~ OF THE EMBODIMENTS
Figs. 1 and 2 illustrate the two standard methods of manufacturing skis at present. In the injection method, which - 4a -,~; ,~,.
~S~ 6~
is shown in Fig. 1, a mold 4 is used to fabricate a ski. The upper belt 1 and lower belt 2 are placed in the mold and the mold is closed. An injection port (not shown) injects a suit-able synthetic foam material 3 between the two belts until the mold is filled. The foam 3 includes an adhesive which, upon drying, caused the two belts to be firmly affixed to the foam CorQ. Once the foam has solidified, the mold 4 is opened and the ski removed. One advantage of the injection method is that the mold can impart to the ski a finished contour, including a curled tip and central camber, without the need for additional cutting or bending. As mentioned previously, however, the - 4b -`
6~
Ii I
¦ traditional ski manufactured by the injection method still suffers from the defect of having the core exposed at the rear end, the additional step of attaching a rear end guard is required. I
In the sandwich method, shown in Fig. 2, the upper belt 1 ¦
and the lower belt 2 are bonded to a core 3 made from wood or pre-hardened foam. The layers are bonded together by any suit-able adhesive 5 under pressure. In some instances air chambers are provided to make the ski lighter or more flexible. The ski produced in this manner is typically rectangular and subsequent cutting and bending are necessary to arrive at the final ski form. Once again the ski suffers from the defect of having an exposed core at the rear end. Typically the rear end of the ski is milled after the ski has been pressed, trimed and shaped.
Once the end has been milled, a properly sized guard piece is glued or screwed onto the rear end of the ski.
In Fig. 3 a version of the ski according to the invention is shown in longitudinal section with exaggerated heights; a single, continuous strip of belting material forms an upper belt portion 1 and a lower belt portion 2 surrounding the core 3. Any additional layer that may be present is not shown in the sche-matic picture. The inner distance between upper belt 1 and lower belt 2 in a typical ski is in area A 1 to 2 mm, in area B 1.0 to 1.5 mm, in area C approximately 25 mm and in area D appr. 2 mm.
Fig. 4 shows the preferred construction of the belting ¦ material. In the preferred embodiment the belting material com-l prises a bonded to a hard synthetic layer, which serves as the ¦l ~external layer. In the finish product this external layer forms ~¦ the bottom running surface as well as the upper surface and rear ¦¦ end guard. Durability is a prime consideration in selecting the I external layer; for this reason materials such as polyethylene I!
6~36~
11l 1 I are preferred. Fig. 4a shows a typical configuration of the ¦ bel1;ing material i n schematic longitudinal sec~ion. In this ¦ embt)diment a fiberglass laminate 6 is bonded to a polyethylene ¦ layer 7. Fig. 4b shows one embodiment of the ContinuouS Strip i I of belting material wherein tWo Segments Of the fiberglass la~i-nate have been milled out to permit easy bending in the direction of the arrows. In Fig. 4 c an alternative embodiment is shown wherein two pressed spotS have been formed in the fiberglass la~inate by compression, again to permit easy bending.
With the manufacture of the Ski it is preferable that tne ¦ notched, cut-into, milled-out or compres~-d spots correspond to the later thickness Of the ski Core (Fig 4). It is also pref-erable that when cutting or~ milling (Fig. 4b) only the fiberglass laminate, and not the external surface layer be CUt.
With proper selection of dimensioning and materials it iS
however also possible to bend the bonded material hot, without previous preparation of the planned bending edges. According to the invention bending may be done with the aid of a bending gzge or a simple bending press. When the injection method iS followed ¦ the fact, that the two pieces, constituting the upper- and low~r belts, are connected, additionally facilitates adjustment of tne pieces in the form.
In Fig. 5 the bending of the belting material in area r of Fig. 3 is shown enlarged schematically; with thick laminates ! the shaping of the rear end edges is improved by previous preF-aration of the bending edges (arrows) through one of the proc~-dures mentioned above.
l~ The ski according to the invention features several ¦l advantages in manufacture and uSe when compared with skis of I conventional construction The possibility of prefabricatiny the l; , 1~ 686~ ~
upper- and lower belts in one single piece, including prepared bending edges when necessary, allows savings of material and therefore a more economic and more effic;ent production; furth-r-more, the additional step of installing the rear end guard is eliminated.
The preferred use of a strip of one kind of bonded material to produce the upper- and lower belts leads to the result, that the upper surface of the ski has the same properties as the running surface. Especially with cross country skis, this has the adYantage, that, because of the high apolarity and the excellent gliding properties, no snow or ice accumulates on the upper surface of the ski. At the same time, the upper and the lower surfaces may be printed on in any design desired, and the surface then sealed with a transparent layer, which results in a completely wear-proof design.
The integrated rear end guards produced, according to the inYention, result in a far greater stability and resistance to wear and tear of the rear ends of the skis.
Claims (16)
1. An improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire length of the ski, the improvement comprising a continuous belt material which forms the upper and lower surfaces and which is formed around the core material at the rear of the ski to form an integral rear end guard.
2. The improved ski of claim 1 wherein the continuous belt material is a fiber glass re-inforced laminate bonded to a layer of polyethylene, which layer of polyethylene forms the external upper and lower surface of the ski and the external surface of the integral rear end guard after the continuous belt material is formed around the core material.
3. The improved ski of claim 1 wherein the continuous belt material is tapered to a lesser thickness at two spots along its length to facilitate bending.
4. The improved ski of claim 3 wherein the tapered spots correspond to the upper and lower corners of the rear end of the ski and the distance between the two tapered spots is roughly the thickness of the core material in the region of the rear end of the ski.
5. The improved ski of claim 4 wherein the continuous belt material is tapered of the spots by milling out those portions of the belt.
6. The improved ski of claim 4 wherein the continuous belt material is tapered at the spots by compressing those portions of the belt.
7. The improved ski of claim 1 wherein the continuous belt; material is shaped around the core material at the rear end of the ski in a hot, bendable, state.
8. The method of constructing an improved ski using an injection-type, ski fabricating, mold, which method com-prises the following steps:
a) placing a U-shaped continuous belt into the mold;
b) sealing the mold with the exception of an air vent and an injection port;
c) injecting through said injection port and between the upper and lower portions of the U-shaped continuous belt, a suitable, synthetic, self adhesive, foam material;
d) hardening said self-adhesive foam material where-by it adheres to the U-shaped continuous belt to form an improved ski having an integral rear end guard.
a) placing a U-shaped continuous belt into the mold;
b) sealing the mold with the exception of an air vent and an injection port;
c) injecting through said injection port and between the upper and lower portions of the U-shaped continuous belt, a suitable, synthetic, self adhesive, foam material;
d) hardening said self-adhesive foam material where-by it adheres to the U-shaped continuous belt to form an improved ski having an integral rear end guard.
9. The method of constructing an improved ski using a sandwich press and adhesive, which method comprises:
a) securing a suitable core material to a U-shaped continuous belt with a layer of adhesive sep-arating the core material from the belt to form a sandwich;
b) placing the sandwich of core, adhesive and belt-ing materials into a sandwich press and applying pressure; and c) removing from the press after the adhesive has set a rough formed ski having an integral rear end guard.
a) securing a suitable core material to a U-shaped continuous belt with a layer of adhesive sep-arating the core material from the belt to form a sandwich;
b) placing the sandwich of core, adhesive and belt-ing materials into a sandwich press and applying pressure; and c) removing from the press after the adhesive has set a rough formed ski having an integral rear end guard.
10. The method of claim 8, which method further comprises pre-forming the continuous belt with two tapered spots of lesser thickness, the tapered spots corresponding to upper and lower corners of the rear end of the finished ski and facilitating the bending of the continuous belt into a U-shape.
11. The method of claim 9, which method further comprises pre-forming the continuous belt with two tapered spots of lesser thickness, the tapered spots corresponding to upper and lower corners of the rear end of the finished ski and fac-ilitating the bending of the continuous belt into a U-shape.
12. An improved ski, having an upper surfacing material and a lower surfacing material, the two surfacing materials being separated by, and affixed to, a core material throughout substantially the entire length of the ski, the improvement comprising a continuous belt material of fiber-glass reinforced laminate bonded to a polyethylene surface layer, which belt material forms both the upper and lower surfacing material and which is bent around the core material at the rear end of the ski, so that the polyethylene layer forms the bottom running surface, as well as the upper surface, the belt material further forming an integral guard around the core material at the rear end of the ski.
13. The improved ski of claim 1 wherein the core material is a foam material.
14. The improved ski of claim 1 wherein the bonded material comprises a fiber-glass, reinforced, thermoplastic layer, which forms both the upper surface and the bottom running surface of the ski.
15. The improved ski of claim 1 wherein the continuous belt of bonded material is about the rear end of the ski in a general U shape.
16. The improved ski of claim 12 wherein the core material comprises a prehardened foam material, and wherein the con-tinuous belt of bonded material, at the rear end of the ski, is in the form of a U shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA334,021A CA1106864A (en) | 1979-08-17 | 1979-08-17 | Ski and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA334,021A CA1106864A (en) | 1979-08-17 | 1979-08-17 | Ski and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106864A true CA1106864A (en) | 1981-08-11 |
Family
ID=4114949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA334,021A Expired CA1106864A (en) | 1979-08-17 | 1979-08-17 | Ski and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1106864A (en) |
-
1979
- 1979-08-17 CA CA334,021A patent/CA1106864A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |