CA1194255A - Sport shoe sole - Google Patents
Sport shoe soleInfo
- Publication number
- CA1194255A CA1194255A CA000452316A CA452316A CA1194255A CA 1194255 A CA1194255 A CA 1194255A CA 000452316 A CA000452316 A CA 000452316A CA 452316 A CA452316 A CA 452316A CA 1194255 A CA1194255 A CA 1194255A
- Authority
- CA
- Canada
- Prior art keywords
- wear
- heel
- resistant
- article
- sole
- 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
Landscapes
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
CONSTRUCTION FOR AN ATHLETIC SHOE AND PROCESS OF MAKING
ABSTRACT OF THE DISCLOSURE
A process and configuration for constructing the lower part of a spikeless type athletic shoe having molded studs on its undersurface to improve its wear-resistance is disclosed wherein portions of the sole and heel are premolded of an extra-durable material, such as high carbon content rubber, and then disposed partly cured in the shoe master mold at selected locations for molding and curing with the remainder of the sole and heel to produce a lower construction of conventional rubber molded with underface portions of extra-durability at the selected areas of greatest wear.
ABSTRACT OF THE DISCLOSURE
A process and configuration for constructing the lower part of a spikeless type athletic shoe having molded studs on its undersurface to improve its wear-resistance is disclosed wherein portions of the sole and heel are premolded of an extra-durable material, such as high carbon content rubber, and then disposed partly cured in the shoe master mold at selected locations for molding and curing with the remainder of the sole and heel to produce a lower construction of conventional rubber molded with underface portions of extra-durability at the selected areas of greatest wear.
Description
9~
BACKGROUND OF THE l~v~lION
The present invention relates to an improved construction and method o making the lowers of m~ded ootwe~r and more particularly to an integrally molded sole and heel construction having portions of extra durability disposed ~n the undersurface at the areas of greatest stress and wear.
Various processes and constructionsare known involving the injection of plas~ics and/~r the molding and curing of rubber to produce molded footwear. In most of these processes, the uppers and lowers of the sho~s are generally constructed to simulate parts previously made of leather. Of late, athletic shoes oE the type with cleats or spikes attached to the undersurface, such as baseball, football, or golf shoes, have had the spike elements simulated by studs molded integrally with the sole and heel portions. Such shoes, as all shoes, are subjected to localized stresses, abrasion and wear during use which cause certain areas to wear out much more rapidly than others, shortening the useable life of indi~idual shoes~and of pairs of such shoes~that are otherwise in good condition. In the past,different means have been added to the undersurfaces of shoes, typically metal tabs or rubber plugs, to act to reinforce the areas of extreme wear. However, such added means have not been found to be suitable or economical for use with molded shoes and particularly those of the spikeless type as the studs on the soles and heels are exposed to extreme stresses.
BACKGROUND OF THE l~v~lION
The present invention relates to an improved construction and method o making the lowers of m~ded ootwe~r and more particularly to an integrally molded sole and heel construction having portions of extra durability disposed ~n the undersurface at the areas of greatest stress and wear.
Various processes and constructionsare known involving the injection of plas~ics and/~r the molding and curing of rubber to produce molded footwear. In most of these processes, the uppers and lowers of the sho~s are generally constructed to simulate parts previously made of leather. Of late, athletic shoes oE the type with cleats or spikes attached to the undersurface, such as baseball, football, or golf shoes, have had the spike elements simulated by studs molded integrally with the sole and heel portions. Such shoes, as all shoes, are subjected to localized stresses, abrasion and wear during use which cause certain areas to wear out much more rapidly than others, shortening the useable life of indi~idual shoes~and of pairs of such shoes~that are otherwise in good condition. In the past,different means have been added to the undersurfaces of shoes, typically metal tabs or rubber plugs, to act to reinforce the areas of extreme wear. However, such added means have not been found to be suitable or economical for use with molded shoes and particularly those of the spikeless type as the studs on the soles and heels are exposed to extreme stresses.
-2-z~
SUMM~RY OF THE ~NV~:N'l'ION
The lower part oE a molded shoe is constructed in accordance with the'present invention by first formin~ one or m~re portions of the sole and/or heel oE a material ~ith extra durability such as high carbon content rubber. Thes'e portions, partly cured, are disposed in the master mold o~ the shoe at locatiDns on the sole and/or heeI that are normally subjected to the ~reatest amount of stress, abrasion and wear. The entire lower part of the sho~ is then molded and cured wi~h the wear-resistant portions bPcoming integral with the r~m~; ni ng portions which may be of les,s expensiye rubber or plastic. This process results in a construction that provides longer shoe liEe while m; n;m; 2ing the extra cost oE materials, in its manufacture. The construction is particularly suitable in shoes having studded undersurfaces as the studs are quite vulnerable to shearing stresses and abrasion so that the extra durability is important.
, BRI'~F DESCRIPTION-:OF T'.IE DRAWI~GS
Fig. 1 is an illustrative view of the sole and heel of a golf shoe showing a construction of the present invention.
Fig. 2 is a side sectional view o:E a part of the sole shown in Fig. 1.
DETAILED D~SCRIPTION ~F TFIE INyENTI~N
The studded sole and heel of an athleti,c ~hoe, ,s~peci,fically a yolf shoe formed in the manner of the present invention, is, shown in Fig~ 1. This lower part 1 of the shoe is, of molded c~nstruction with circular studs 2a and connected studs 2b all formed integrally with'the body of the s.ole and heeI. The'~verall cons,truction may be of rubber, typically a mixture of natural and synthetic rubber, or of a plastic, such as polyurethane, which'is shaped in a heated mold to the form of the shoe.' The upper: and 12wer of the shoe may be separateIy constructed and subsequently adhes~ively atta.ched to each other or they may be'integrally formed in a ma$~ter ,mQld. The form of constructi.on of the shoe upper may be any that is found to be compatible with that o~ the lower construction in accordance with the present invention.
It is well known that certain areas of the unders.urface of a shoe lower are subjected during use to greater and more frequent stress, abrasion and wear than other areas. It has been found, for example, in the case of spikeless or studded golE shoes.
that the center area of the sole and the outer edge and rear of the heel tend to experience greater stress and abras.ion than the other areas of the undersurface, so that the studs in these areas~ may break off or wear down most rapidly. It is therefore desirable that the material of the undersurface in the eEected areas be made more wear-resistant to extend the usuable life of the shoe.
This added resistance to ~ear is accompli,shed with the present invention by constructing the'relevant part~s~ of the. sh,oe lower of a material or materials. with greater durabi.lity and reSistance to abrasion and ~ear than the conventional mate~ials while continuing to use the latter ~aterials for the r~ain~er Df the construction. Accordingly, portions of the lower are premolded, in the forms shown at A and B in Figure 1, of improved strength material such as high carbon content rubber or an equivalent plastic or the like. For the purpose~ of the present invention a rubber having a carbon ratio of a much greater percentage than that of the co~ventional rubber used in molded shoes has been found to be quit~
suitable providing as much as a 50% increase in durability. A carbon fiber reinforced rubber may be used in applications requiring extreme durability. The wear-resistant ruhber is partly cured, preferably about 70% cured, during the premolding and when properly formed is ready for incorporation into the remainder of the lower in the master mold. The premolding may be carried out in the master mold or it may be accomplished in a smaller mold and the premolded, partly cured portions then transferred to the master mold, as will be found suitable. In either event, the premolded portions are disposed in the master mold at the areas of the lower expected to experience the greatest wear, such as the areas of the sole and heel A and B shown in Fig. 1. The remainder of the material making up the lower, which material may be a conventional rubber or compatible plastic or even a less expensive material of lesser durability, is then placed in the mold and the entire lower is formed and cured by the application of appropriate heat. Typically the thickness of the preformed portions will have a thickness of about 1.5mm ~hile the thickness of the entire lower will be about 3.5mm so that the preformed portions will be incorporated as insets into the low~er and inte~rated into the body thereof upon completion ~f the curi~g as sho~n in Fig. 2. The resulting lower is an integrally formed sole and heel of a conventional material with areas of its undersurface including portion~ of increased dura~ility at the points of greatest stress and wear. Cons:equently, shoes incorpor-ating this improved lower will have an increased wear life with a minimt1m, if any, increase in the cost o~ manufacturs as the use of less expensive material can offset the increased cost of the more durable material.
To insure secure incorporation of the wear-resistant portions into the remainder of the sole and heel material, these portions may be specially formed during premolding with tabs, flanges or other interlocking means which will become embedded in the surrounding material during subsequent molding and curing.
For example t the upper peripheral edges of these portions may be extended such that their upper surfaces are greater in area than their lower surfaces as indicated in dotted lines in Fig. 2.
It will therefore be seen fr.om the foregoing description thab an improved construction for the lowers of molded shoes is disclosed which will permit longer shoe life by strengthening the undersurfaces and studs thereon to resist stresses, abrasion and wear. The materials of construction that will be found suitable for use with the present invention are withi.n the purview of those skilled in the art- Also it will be understood that the invention may be applied with non-studded molded athletic shoes such as for tennis, basketball, and jogging, and with many other forms of footwear.
SUMM~RY OF THE ~NV~:N'l'ION
The lower part oE a molded shoe is constructed in accordance with the'present invention by first formin~ one or m~re portions of the sole and/or heel oE a material ~ith extra durability such as high carbon content rubber. Thes'e portions, partly cured, are disposed in the master mold o~ the shoe at locatiDns on the sole and/or heeI that are normally subjected to the ~reatest amount of stress, abrasion and wear. The entire lower part of the sho~ is then molded and cured wi~h the wear-resistant portions bPcoming integral with the r~m~; ni ng portions which may be of les,s expensiye rubber or plastic. This process results in a construction that provides longer shoe liEe while m; n;m; 2ing the extra cost oE materials, in its manufacture. The construction is particularly suitable in shoes having studded undersurfaces as the studs are quite vulnerable to shearing stresses and abrasion so that the extra durability is important.
, BRI'~F DESCRIPTION-:OF T'.IE DRAWI~GS
Fig. 1 is an illustrative view of the sole and heel of a golf shoe showing a construction of the present invention.
Fig. 2 is a side sectional view o:E a part of the sole shown in Fig. 1.
DETAILED D~SCRIPTION ~F TFIE INyENTI~N
The studded sole and heel of an athleti,c ~hoe, ,s~peci,fically a yolf shoe formed in the manner of the present invention, is, shown in Fig~ 1. This lower part 1 of the shoe is, of molded c~nstruction with circular studs 2a and connected studs 2b all formed integrally with'the body of the s.ole and heeI. The'~verall cons,truction may be of rubber, typically a mixture of natural and synthetic rubber, or of a plastic, such as polyurethane, which'is shaped in a heated mold to the form of the shoe.' The upper: and 12wer of the shoe may be separateIy constructed and subsequently adhes~ively atta.ched to each other or they may be'integrally formed in a ma$~ter ,mQld. The form of constructi.on of the shoe upper may be any that is found to be compatible with that o~ the lower construction in accordance with the present invention.
It is well known that certain areas of the unders.urface of a shoe lower are subjected during use to greater and more frequent stress, abrasion and wear than other areas. It has been found, for example, in the case of spikeless or studded golE shoes.
that the center area of the sole and the outer edge and rear of the heel tend to experience greater stress and abras.ion than the other areas of the undersurface, so that the studs in these areas~ may break off or wear down most rapidly. It is therefore desirable that the material of the undersurface in the eEected areas be made more wear-resistant to extend the usuable life of the shoe.
This added resistance to ~ear is accompli,shed with the present invention by constructing the'relevant part~s~ of the. sh,oe lower of a material or materials. with greater durabi.lity and reSistance to abrasion and ~ear than the conventional mate~ials while continuing to use the latter ~aterials for the r~ain~er Df the construction. Accordingly, portions of the lower are premolded, in the forms shown at A and B in Figure 1, of improved strength material such as high carbon content rubber or an equivalent plastic or the like. For the purpose~ of the present invention a rubber having a carbon ratio of a much greater percentage than that of the co~ventional rubber used in molded shoes has been found to be quit~
suitable providing as much as a 50% increase in durability. A carbon fiber reinforced rubber may be used in applications requiring extreme durability. The wear-resistant ruhber is partly cured, preferably about 70% cured, during the premolding and when properly formed is ready for incorporation into the remainder of the lower in the master mold. The premolding may be carried out in the master mold or it may be accomplished in a smaller mold and the premolded, partly cured portions then transferred to the master mold, as will be found suitable. In either event, the premolded portions are disposed in the master mold at the areas of the lower expected to experience the greatest wear, such as the areas of the sole and heel A and B shown in Fig. 1. The remainder of the material making up the lower, which material may be a conventional rubber or compatible plastic or even a less expensive material of lesser durability, is then placed in the mold and the entire lower is formed and cured by the application of appropriate heat. Typically the thickness of the preformed portions will have a thickness of about 1.5mm ~hile the thickness of the entire lower will be about 3.5mm so that the preformed portions will be incorporated as insets into the low~er and inte~rated into the body thereof upon completion ~f the curi~g as sho~n in Fig. 2. The resulting lower is an integrally formed sole and heel of a conventional material with areas of its undersurface including portion~ of increased dura~ility at the points of greatest stress and wear. Cons:equently, shoes incorpor-ating this improved lower will have an increased wear life with a minimt1m, if any, increase in the cost o~ manufacturs as the use of less expensive material can offset the increased cost of the more durable material.
To insure secure incorporation of the wear-resistant portions into the remainder of the sole and heel material, these portions may be specially formed during premolding with tabs, flanges or other interlocking means which will become embedded in the surrounding material during subsequent molding and curing.
For example t the upper peripheral edges of these portions may be extended such that their upper surfaces are greater in area than their lower surfaces as indicated in dotted lines in Fig. 2.
It will therefore be seen fr.om the foregoing description thab an improved construction for the lowers of molded shoes is disclosed which will permit longer shoe life by strengthening the undersurfaces and studs thereon to resist stresses, abrasion and wear. The materials of construction that will be found suitable for use with the present invention are withi.n the purview of those skilled in the art- Also it will be understood that the invention may be applied with non-studded molded athletic shoes such as for tennis, basketball, and jogging, and with many other forms of footwear.
Claims (17)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for producing a lower for footwear, such as a sole for an athletic shoe, comprising the steps of:
premolding and partly curing a portion of the lower of a relatively wear-resistant material;
disposing said premolded partly cured portion in a master mold including a form of the lower at a location with respect to the remaining portions of the lower that is normally subjected to a greater degree of wear;
partly surrounding said premolded portion with a material of less wear resistance in a master mold to form the remaining portion of the lower; and completing curing so as to mold all of the portions into a composite lower of integral construction with an area of its undersurface of at least one relatively wear-resistant portion at a location normally subjected to a greater degree of wear and use.
premolding and partly curing a portion of the lower of a relatively wear-resistant material;
disposing said premolded partly cured portion in a master mold including a form of the lower at a location with respect to the remaining portions of the lower that is normally subjected to a greater degree of wear;
partly surrounding said premolded portion with a material of less wear resistance in a master mold to form the remaining portion of the lower; and completing curing so as to mold all of the portions into a composite lower of integral construction with an area of its undersurface of at least one relatively wear-resistant portion at a location normally subjected to a greater degree of wear and use.
2. A process as in claim 1, wherein said remaining portion and wear-resistant portion are rubber.
3. A process as in claim 2, wherein said wear-resistant portion has a higher carbon content than the remaining portion.
4. A process as in claim 1, wherein the lower comprises a sole and said premolded portion is located substantially in the middle of the sole.
5. A process as in claim 1, wherein the lower comprises a heel and said premolded portion is located along one edge of said heel.
6. A process as in claim 1, wherein the lower comprises a heel and said premolded portion is located along the rear of said heel.
7. A process as in claim 1, wherein said premolded portion comprises a plurality of studs.
8. A process as in claim 1, wherein the lower is formed on its undersurface with a plurality of studs.
9. An article produced by the process of claim 1.
10. An article of footwear comprising:
a lower of integrally molded material;
at least one portion of said material having greater resistance to wear than the adjacent portions; and said wear-resistant portion being disposed in an area of the undersurface of said lower that is normally subjected to a greater amount of stress and abrasion during use;
wherein said portion with greater wear resistance has been partially cured when disposed in contact with the adjacent portions, and cure of both wear-resistant and adjacent portions has been completed with said portions in contact with each other.
a lower of integrally molded material;
at least one portion of said material having greater resistance to wear than the adjacent portions; and said wear-resistant portion being disposed in an area of the undersurface of said lower that is normally subjected to a greater amount of stress and abrasion during use;
wherein said portion with greater wear resistance has been partially cured when disposed in contact with the adjacent portions, and cure of both wear-resistant and adjacent portions has been completed with said portions in contact with each other.
11. An article as in claim 10, wherein said lower comprises a sole and said wear-resistant portion is located substantially in the middle of the sole.
12. An article as in claim 10, wherein said lower comprises a heel and said wear-resistant portion is located along one edge of said heel.
13. An article as in claim 10, wherein said lower comprises a heel and said wear-resistant portion is located along the rear of said heel.
14. An article as in claim 10, wherein said wear-resistant portion comprises a plurality of studs.
15. An article as in claim 10, wherein the undersurface of the lower comprises a plurality of studs.
16. An article as in claim 10, wherein both wear-resistant and adjacent portions are constructed of rubber.
17. An article as in claim 16, wherein said wear-resistant portion is a higher carbon-content rubber than that of the adjacent portions.
9.
9.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/567,075 US4564966A (en) | 1983-12-30 | 1983-12-30 | Construction for an athletic shoe and process of making |
| US567,075 | 1983-12-30 | ||
| US58539884A | 1984-02-27 | 1984-02-27 | |
| US585,398 | 1984-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1194255A true CA1194255A (en) | 1985-10-01 |
Family
ID=27074360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000452316A Expired CA1194255A (en) | 1983-12-30 | 1984-04-18 | Sport shoe sole |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1194255A (en) |
-
1984
- 1984-04-18 CA CA000452316A patent/CA1194255A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |