This application relates to golf shoe outsoles and other athletic shoe outsoles subject to dynamic loading and weight shift during athletic activities, especially on grass covered ground surfaces.
A golf shoe, and especially the outsole of a golf shoe, plays an important role during a golfer's swing because it serves as the golfer's sole contact surface with the ground and acts as a platform to support the golfer during the golf swing. The golfer's footwork is important to the execution of a proper and effective golf swing.
The golfer's footwork during the swing is nuanced and differs from left foot to right foot. In general, for most golf shots the golfer's weight is initially distributed 50/50 on each foot and the weight is centered in the middle of each foot. During the backswing, the golfer's weight should shift to the outside (lateral side) of the golfer's back foot while the front foot maintains some weight for balance. The backswing applies forces tending to spin or pivot the back forefoot outwardly and the back heel inwardly, which must be resisted by the back foot's contact with the ground to maintain stability. During the downswing of the club, the golfer's weight begins to shift and by the time the golf ball is struck, the golfer's weight is evenly balanced on the rear foot and front foot or has started to shift more to the front foot. At the finish position of the swing, most of the golfer's weight is on the front foot with more weight on the outside (lateral side) of the front foot than the inside (medial side), and the golfer's heel and shoe outsole are elevated above the ground and facing rearwardly. In a proper swing, only the toe of the golfer's rear foot remains in contact with the ground at the finish. In the finish position the heel and most of the outsole of the golfer's rear shoe are off of the ground, with only the toe contacting the ground for balance.
With the foregoing footwork, the golfer's weight on any local area of the outsole constantly changes and shifts throughout the golf swing.
Improvements in the golf shoe outsole that provide the golfer with greater traction, better stability, improved overall balance, and greater power and consistency during the golf swing are most desirable.
In a first embodiment, a golf shoe outsole has a low profile outsole member with a heel end, opposite toe end, lateral side and opposed medial side. The outsole member defines first, second, third and fourth quarter sections extending from the heel to the toe end, with the second and third quarter sections having a boundary therebetween defining a lateral mid-line through the outsole. The outsole member also defines a heel region proximate the heel end, forefoot region proximate to the toe end, and arch region therebetween. The outsole member defines a heel centerline that substantially bisects the heel region and extends from the heel end to the toe end. At least one dynamic traction element is attached to the outsole member and located within the second quarter section at least partially on the heel centerline.
In other specific implementations, the outsole includes at least two dynamic traction elements attached to the outsole member, which are located within the second quarter section and at least partially on the heel centerline. The dynamic traction element may be removably attached to the outsole member.
In other specific implementations, the dynamic traction elements are spike cleats having a plurality of flexible legs.
In other embodiments, the outsole member includes at least one zonal traction region and at least one dynamic traction element attached to each zonal traction region. In still other embodiments, each zonal traction region is made from a material having a rigidity greater than the rigidity of an adjacent outsole region.
In other embodiments, the outsole member includes at least two independent zonal traction regions, and at least one dynamic traction element attached to each zonal traction region. In specific implementations, the outsole may include a plurality of directional static traction elements attached to each zonal traction region, each having a longitudinal axis that is substantially radially aligned with a center point of the dynamic traction element.
In another embodiment, an outsole member includes a heel end, opposite toe end, heel area without a raised heel, forefoot area and arch area. The outsole member defines a heel centerline that substantially bisects the heel area and extends from the heel end to the toe end, passing through the arch area and forefoot area. First and second zonal traction regions embedded in the outsole are substantially bisected by the heel centerline. The first zonal traction region may have one end in the arch area and another end in the heel area. The second zonal traction region may have one end in the arch area and another end in the forefoot area. At least one dynamic traction element is attached to each zonal traction region.
In another implementation, the outsole may include at least one static traction element attached to each zonal traction region.
In yet another embodiment, the first and second zonal traction regions have ends that are proximate to one another and are separated by a recessed channel.
In an alternative embodiment, the first and second zonal traction regions are integral extensions of one another.
In yet another embodiment, the first and second zonal traction regions each are substantially symmetrical relative to the heel centerline and have leg portions separated by a recessed area therebetween.
In another implementation, the first and second zonal traction regions each have a substantially “V” shaped configuration, and have plural dynamic traction elements and plural static traction elements coupled or affixed thereto.
In another embodiment, the dynamic traction elements are detachable spike cleats and the static traction elements are non-detachable lug cleats.
In yet another embodiment, a golf shoe outsole includes a low profile outsole member having a toe end, heel end, lateral side edge and opposed medial side edge. The outsole member defines a heel area, forefoot area and arch area therebetween. First and second channels may be formed in the forefoot area of the outsole, with the first and second channels extending substantially from the lateral side edge to the medial side edge and being substantially parallel to one another. A third channel extending diagonally from the first channel to the second channel may be provided to create laterally opposed, raised outsole pod areas on each side of the third channel.
In another implementation, the outsole may include at least one dynamic traction element coupled to each outsole pad area.
In another embodiment, the outsole may include at least one static traction element coupled to each outsole pod area.
In another implementation, an athletic shoe outsole includes a substantially flat base surface extending from a heel end to a toe end of the outsole. The flat base surface may define first, second, third and fourth quarter sections moving from the heel end to the toe end. A first zonal traction region may be located at least partially within the second quarter section, and a second zonal traction region may be located at least partially within the second quarter region. The first and second zonal traction regions may each support at least one dynamic traction element that is at least partially located in an arch area of the flat base surface. At least one traction element in each zonal traction region may be substantially centered between the lateral and medial edges of the outsole, and bisected by a heel centerline extending from the heel end to the toe end.
The foregoing and other objects, features, and advantages of the invention will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures.
The following description is exemplary in nature and is not intended to limit the scope, applicability, or configuration of the disclosed embodiments in any way. Various changes to the described embodiment may be made in the function and arrangement of the elements described herein without departing from the scope of the disclosure.
As used in this application and in the claims, the singular forms “a” and “the” include the plural forms unless the context clearly dictates otherwise. Additionally, the term “includes” means “comprises.”
Moreover, for the sake of simplicity, the attached figures may not show the various ways (readily discernible to one of ordinary skill in the art) in which the disclosed apparatus can be used in combination with other systems, methods and apparatuses.
A low profile golf shoe outsole 10 is shown and described in various embodiments herein. As shown in
Outsole 10 has a heel end 12, opposite toe end 14, lateral side edge 16 and medial side edge 18, as shown in
The outsole also generally can be divided into three areas or regions, a heel region 30 proximate to the heel end, forefoot region 32 proximate to the toe end, and arch region 34 therebetween. Heel region 30 generally corresponds to the portion of the outsole underlying the golfer's heel. Arch region 34 generally corresponds to the portion of the outsole underlying the golfer's arch. Forefoot region 32 generally corresponds to the portion of the outsole beneath the golfer's forefoot. It will be appreciated that the boundaries between these regions are not precise, but are understood to generally correspond to the anatomy of the golfer's foot.
As shown in
As shown in
Dynamic traction elements 36 preferably are detachable spike cleats that are omni-directional and may be detached and replaced when they wear out. Spike cleats 36 preferably each have resilient legs spaced radially around the center of the cleat, which dynamically (or actively) flex depending on the amount of weight or loading to which the spike cleat is subject. Each spike cleat 36 has a threaded end and is attached to a corresponding threaded receptacle 40 (see
The primary dynamic traction elements preferably include two spike cleats 36a, 36b which are located at least partially within arch section 34 and are substantially aligned longitudinally with heel centerline 12-12. Spike cleats 36a, 36b provide traction under the arch portion of the golfer's foot in an area normally separated from the ground surface in a conventional golf shoe having a raised heel. Spike cleats 36a, 36b preferably are located substantially within, and most preferably completely within, second quarter section 22, and on the heel side of midline 28. While heel centerline 12-12 preferably substantially bisects spike cleats 36a, 36b, the spike cleats generally may be substantially centered between lateral and medial side edges 16, 18, with heel centerline 12-12 passing through at least a portion of both spike cleats 36a, 36b.
While two spike cleats are shown affixed to the outsole within second quarter section 22 and at least partially within arch region 34, it will be appreciated that more than two cleats or just one large cleat may be used in place of cleats 36a, 36b to provide traction in the central area between the heel and forefoot areas of the outsole.
Secondary static traction elements 38 preferably are lug style cleats formed as integral extensions of the outsole surface to which they are attached, and are formed as part of the outsole molding process. The lug cleats are dispersed throughout the outsole in the heel region, along the lateral and medial edges, in the toe area and between adjacent pairs of spike cleats, to provide additional static traction. Lug cleats 38 do not have flex elements like dynamic traction elements and therefore are much less flexible than spike cleats 36. While the lug cleats may elastically deform, they do not have dynamic flex elements comparable to the legs of spike cleats 36.
The lug cleats optionally have a frusto-pyramidal shape and are directionally oriented to provide increased traction and resistance in certain directions, depending on their location on the outsole. For example, the lug cleats surrounding spike cleats 36a, 36b preferably form a starburst pattern on all sides in which the longitudinal axis of each lug cleat is substantially radially aligned with the center of spike cleat 36a, center of spike cleat 36b or a point on heel centerline 12-12 therebetween. In other words, spike cleats 36a and 36b generally form an oval “center of gravity” area with which the adjacent and surrounding lug cleats are substantially radially aligned. Together, the spike cleats 36a, 36b and adjacent directional lug cleats 38 provide omni-directional traction in the arch region and beneath a soft tissue area of the golfer's foot.
The spike cleats typically have a height of about 6.5 mm. The lug cleats preferably have a height less than the height of the spike cleats, as for example about 4.5 mm. The difference in height (about 2 mm) generally causes the spike cleats to serve as a primary traction mechanism and the lug cleats to serve as a secondary traction mechanism depending on the hardness of the ground and magnitude of the load or force applied in the local area of the particular lug cleat. For example, in particularly soft ground in which the spike cleats are more deeply embedded in the ground surface, the lug cleats likewise will engage the ground to provide additional traction. In harder ground and especially with a lighter golfer, many of the lug cleats may not engage the ground surface when the golfer's weight is evenly balanced on both shoes or may bear a lighter share of the load.
A height difference of about 2 mm is generally preferred. Thus, if the spike cleats have a height of 7.5 mm, as measured from the base of the outsole, the lug cleats preferably have a height of 5.5 mm.
The orientation and pattern of the spike cleats and lug cleats shown in
Referring again to
Zonal traction regions 42, 44 preferably are separated by a gap area 46 that is recessed, thinner or formed from a more flexible material than zonal traction regions 42, 44 to facilitate independent flexing therebetween. Gap area 46 behaves much like a crease or hinge between regions 42, 44. In this way, each zonal traction region is influenced very little by forces applied to the other zonal traction region, and is more responsive to forces applied directly thereto. Besides providing a foundation for dynamic and static traction elements, the zonal traction regions provide some additional torsional rigidity to heel and arch regions 30, 34, while still maintaining a considerable measure of flexibility in this area of the outsole. The zonal traction regions also may serve as a design element and may be formed from a colored material that contrasts with the rest of the outsole.
Gap 46 preferably is about 4 to 8 mm wide and about 0 to 3 mm deep. When the gap or channel between zonal traction regions 42, 44 is 0 mm, the two regions are connected or “closed,” and effectively are continuous extensions of one another.
A balance between flexibility and support is further promoted in the embodiment shown in
In one exemplary embodiment, zonal traction regions 42, 44 generally are symmetric about a longitudinal center axis, and have a similar “V” shaped configuration to provide reinforcing support as well as flexibility in heel section 30 and arch section 34. In other alternative embodiments, zonal traction regions 42, 44 may be asymmetric relative to the longitudinal center axis or heel centerline 12-12, may have a configuration other than a “V,” and may have different configurations from each other. In yet another alternative embodiment, zonal traction regions 42, 44 may be merged into one continuous integrated zonal traction region having a generally singular “X” shaped configuration, with no discernible transition or gap area 46 therebetween, as when a more torsionally rigid outsole is desired. Alternatively, the zonal traction regions also may be made from the same material as the outsole to provide a more flexible and compliant outsole.
Referring again to
In one exemplary embodiment, channels 52, 54 have a width of about 2 to 15 mm, preferably about 7 to 12 mm, and a depth of about 1 to 3 mm. Channel 54 preferably has a depth and width that is comparable to or less than the width of channels 52, 54.
The outsole may be formed in any one of a number of conventional methods, including one or more injection molding steps and compression molding. In one exemplary method, the zonal traction regions are formed in a first injection molding step and then the rest of the outsole is injection molded over the zonal traction regions in one or more additional steps. Once formed, midsole 57 may be formed of a complementary shape and attached to the heel and arch region of the outsole by gluing or otherwise. The resulting outsole and midsole construction then may be attached to an upper in a conventional manner.
The cushioning element may be formed from a variety of materials known in the art including ethyl vinyl acetate (EPA) or blown thermoplastic polyurethane (TPU), or blown thermoplastic polyurea (TPUA). Other suitable materials include both natural and synthetic rubbers, such as cis-1,4-polybutadiene, trans-1,4-polybutadiene, 1,2-polybutadiene, cis-polyisoprene, trans-polyisoprene, polychloroprene, polybutylene, the styrenic block copolymers such as styrene-butadiene-styrene (SBS), styrene-ethylene-butylene-styrene, (SEBS) and styrene-ethylenepropylene-styrene (SEPS), (commercial examples include SEPTON marketed by Kuraray Company of Kurashiki, Japan; TOPRENE by Kumho Petrochemical Co., Ltd and KRATON marketed by Kraton Polymers).
The outsole and zonal traction regions may be made from a variety of materials known in the art including polyurethane (PU), polyurea (PUA) (especially thermoplastic polyurethane (TPU) and thermoplastic polyurea (TPUA)), ethyl vinyl acetate (EVA) nylon, carbon fiber, glass fiber, polyaramid (generally designated in the art as an aromatic polycarbonamide) which include those commercially available under the tradenames Kevlar® (E.I. du Pont de Nemours and Company), Twaron® (Akzo Nobel), Technora (Teijin), Nomex® and Nomex Z200 (Ed. du Pont de Nemours and Company), Teijinconex (Teij in), and Apial (Unitika). Other suitable materials include both natural and synthetic rubbers, such as cis-1,4-polybutadiene, trans-1,4-polybutadiene, 1,2-polybutadiene, cis-polyisoprene, trans-polyisoprene, polychloroprene, polybutylene, the styrenic block copolymers such as styrene-butadiene-styrene (SBS), styrene-ethylene-butylene-styrene, (SEBS) and styrene-ethylenepropylene-styrene (SEPS), (commercial examples include SEPTON marketed by Kuraray Company of Kurashiki, Japan; TOPRENE by Kumho Petrochemical Co., Ltd and KRATON marketed by Kraton Polymers). Other suitable materials include the amide block copolymers and ester block copolyethers. The amide block copolymers (PEBA) are well known under the trademark PEBAX® commercialized by ATOCHEM. The ester block polyethers (PEBE), include products that have a rigid phase of the terephtalate polybutadiene type (PBT). These are known under the trademark HYTREL® (E.I. du Pont de Nemours and Company) or ARNITEL® (AKZO).
Despite conventional wisdom, it is believed that a golfer's footwork can be best served to promote a proper swing by giving both feet greater freedom to move and flex during the swing and by providing traction elements under the soft tissue of both feet.
The low flat profile of the present outsole/shoe moves the golfer's center of gravity closer to the ground and distributes the golfer's weight over a wider surface area in contact with the ground. In addition, the present outsole provides substantial traction under the soft tissue and arch of each foot, as well as traction elements that can flex and respond independently to dynamic loading and weight shift, thereby allowing local areas of the outsole advantageously to remain in contact with the ground as long as possible. For example, during the swing follow-through after impact, the medial forefoot spike cleats on the rear outsole can remain engaged with the ground for an interval of time after the lateral forefoot spike cleats lose contact as the heel lifts.
These features provide the golfer with greater traction, better stability, improved overall balance, and a foundation for greater power and consistency during the golf swing. The flexibility of the outsole makes it easier for the golfer to shift weight in the proper manner during the golf swing.
This approach contrasts with many golf shoes that provide relatively rigid platforms, raised heels that elevate the golfer's center of gravity, and traction elements focused primarily in the heel and forefoot regions of the shoe.
It will be appreciated that the principles and embodiments disclosed herein have application to other types of athletic shoes/outsoles that are subject to dynamic loading and weight shift and require outstanding traction, especially athletic shoes used on grass surfaces.
In view of the many possible embodiments to which the principles of the disclosed invention may be applied, it should be recognized that the illustrated embodiments are only preferred examples of the invention and should not be taken as limiting the scope of the invention. Rather, the scope of the invention is defined by the following claims. We therefore claim as our invention all that comes within the scope and spirit of these claims.
This application claims the benefit of U.S. Provisional Application No. 61/658,207, which was filed on Jun. 11, 2012, and is incorporated herein by reference in its entirety.
Number | Date | Country | |
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61658207 | Jun 2012 | US |