Patent Application
20070287561
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The novel design of the instant invention is no way limited regarding basic shaft shapes or materials to be utilized in manufacturing the shaft. The sports stick may possess an external surface, which is cylindrical in shape. Additionally, the sports stick may possess an external surface, which is hexagonal in shape. Further, the sports stick may possess an external surface, which is cylindrical in shape. Thus, the stick can embody any multisided shape to accommodate differing head types.
In one embodiment, there exists a sports stick comprising a handle and a shaft, comprising an internal portion and an external portion. The external portion of the stick may contain a substantially smooth profile and is not restricted to any specific geometry. The external are may also include staggered through slots in the on the side of the external portion for weight and aeration purposes. Further through slots, placed longitudinally where the two pieces intersect upon attachment. These slots are also utilized for weight reduction and airflow purposes.
The internal portion of the stick may include at least one cutaway area for weight reduction and rigidity enhancement. The internal portion may further contain a multiplicity of cutaway areas. The sports stick may further contain a multiplicity of curved cutouts. These curved cutouts may be in the shape of an airfoil and the multiplicity of cutouts can be designed to form a truss structure, which allows internal flexure while maintaining rigidity. Thus, the novel invention enhances structural integrity, especially in the vectorial direction of the force exerted on the object to be moved, while also allowing for flow of air directly through the structure of the stick of a greater volume than the flow along the outer edges of the stick.
Further in regard to structural integrity, upon contact with an obstacle, due the curved, truss-like structure, the shaft will exhibit a tortional or rotational action, instead of the usual buckling effect of a cylindrical member. Also, due to the truss structure, the instant shaft will not buckle upon receiving a dent on the field of play. A further important attribute inherent in the instant invention centers around superior durability and greater longevity of the shaft, due to the rigidity and rotational characteristics of the truss structure. The lack of flexure also assists with the orientation and head alignment toward recovery of ground balls. The torsion affect also assists the user during faceoffs and alignment of head to ground to compensate for the recovery of ground balls. Additionally, the truss structure does allow for flexure in the planes 90 degrees away from the striking direction and receiving direction. Thus, the instant stick will still have the flexure needed for checking, while retaining the stiffness for maximum striking and receiving characteristics.
A major advantage of the truss structure surfaces centers around upon receipt of a pass by the user. Utilization of the truss configuration greatly minimizes the flexure present upon receiving a pass. Thus, the user does not lose position, momentum or control, even when the object received is traveling at a great velocity.
Further the instant stick may include a multiplicity of grooves extending along the entire length of the shaft in order to channel water away from the gripping surfaces. The indentation of the internal cutaways also inherently serves to assist in water removal during inclement weather by providing a roll off area and also less surface for water to accumulate upon. Prior designs attempting to utilize grooves only possess grooves along the handle area and fail to incorporate the cutaway areas. Thus, water is allowed to collect at the end of the gripping area.
Further, the grooved gripping area, along with the shape accomplished with the cutaway areas introduced in the instant invention prevents the shaft from rotating out of the hand of the user since the cutaway areas provide a positive grip not found on basic polygonal shaped shafts. Thus, this positive grip, in combination with the truss structure helps to prevent head and shaft rotation upon receipt of a pass, and thus affords the user far greater control of the shaft. Moreover, the cutaway design and the location of the grips on opposing sides of the shaft serves to consistently indicate the orientation of the striking surface or head of the invention due to the location. Thus, a user never has to glance at the stick in order to know that the head is in proper striking position.
An additional important attribute of the instant invention appears in the minimization of flexure due to the curved surfaces in the form of a truss. Thus, on the wind up and follow through during the delivery of a strike, flexure of the stick is minimized. Thus, the user does not have to compensate for a major backward force upon the backstroke and thus, this lack of flexure in combination with the maximized shaft velocity inherent with the curved cutout design insures that the force upon strike is maximized.
It is an object of the present invention to provide a multi-application sports stick or shaft that exhibits the feel and handling capabilities of a lightweight shaft even at heavier weights, due to the airfoil design. Thus, although the user will gain more power from the heavier shaft, the aerodynamic capabilities of the shaft will create a lighter feel during play and thus tend not to tire the user.
Further, among the utmost facets of the instant invention centers around the inherent ability of the instant shaft to be to be manufactured from dissimilar materials. Due to the properties intrinsic in single shape, cylindrical type shafts, prior shafts are presently unable to be manufactured from dissimilar materials. This capability allows the present invention to utilize the strengths of different materials in both the operational and the aesthetic realm. For example, certain users may favor the feel or other characteristics of a wooden handle. Thus, the instant invention can feature differing raw materials such as wood, polymers, light metals, heavier metals, carbon fibers and composites, all utilized in concert to produce a desired result. For example the raw materials that can be combined to create a shaft are not limited to, but could include, plastic on two sides with wood in between to create a different feel, and still optimize weight and rigidity characteristics.
In regard to manufacturing attributes, the novel stick may be manufactured from any material, including but not limited to aluminum, titanium, composite graphite and carbon fiber. Additionally, the stick may be produced of tubular shaped raw, even dissimilar materials or components in the shape of squares, rectangles, rounds, or hexagons. Due to the novel, non tubular design of the instant invention, in regard to methods of production, the shaft may be manufactured from dissimilar materials and shapes of material, joined together by methods, including but not limited to welding, bonding, brazing, screwing and mechanical fastening subsequent to dovetailing. Thus the instant invention is not limited the use of one type, or especially one shape, of raw material and is thus not limited by the design and production restrictions inherent with those shapes or materials.
Investigating the features that contribute to the superior operational capabilities of the novel shaft, analysis of the invention in consideration of the laws of physics reveals why this invention provides a faster and more accurate strike. Considering the force generated and imparted upon an object to be projected, force is a vector quantity, having both magnitude and direction. The basic equation for force is as follows: F=mass×acceleration=m(a) in units of kg×m/sec2. Thus, if the acceleration could be held constant, the force applied to the ball from the shaft would naturally be greater when a heavier shaft is utilized, since the mass component will be greater than that of a lighter shaft.
In prior designs, due to the constraints inherent with a human user, a loss of acceleration would naturally occur due to the greater shaft mass, since the user can only achieve a maximum moment based on the weight of the shaft. However, the instant design solves this problem through utilization of aerodynamic principles. Due to the airfoil shaped cutout design, as evinced in basic aerodynamic terms, the velocity achieved would be greater as the airfoil exhibits the greatest possible airflow over an object. Prior shafts were designed with cylindrical, hexagonal or some form of polygonal profile. Where the instant invention offers adaptation of similar external profiles, the additional integration of a series of internal airfoil and circular shaped ports channeled through the material creates a far superior flow path. Simply put, the flow directly through a series of smooth airfoils and cylinders is significantly less turbulent than the flow over a solid cylindrical member, as there will be less breakage in the laminar boundary.
Thus the overall airflow around and through the instant invention is dramatically enhanced when compared to the flow over a solid cylindrical member. Thus, these flow advantages clearly translate into greater shaft velocity and acceleration.
Thus, even when a metallic material is chosen from which to manufacture the shaft, the greater acceleration and velocity from the aerodynamic advantage will more than compensate for the slight additional weight. Thus, with a heavy shaft, the force delivered to move an object will be maximized. Conversely, when lighter materials are used, the advantage of the instant design can only greatens as the far greater acceleration drastically surpasses the lighter weight in the equation of force generated.
Further investigating momentum considerations, in mechanics, momentum is the quantity of motion of a body, specifically the product of the mass of the body and its velocity, (mass×velocity=kg×m/sec). Momentum is a vector quantity and thus possesses both a magnitude and a direction, the direction being the same as that of the velocity vector. When an external force acts upon a body or a system of bodies in motion, it causes a change in the momentum of the body. The impulse of a force, acting on a body, is the product of the force and the duration of time in which it acts and is equal to the change in momentum of the body. Clearly, following the above analysis, the momentum obtained by the ball should thus be increased by the novel design.
Further and of great import regarding any sports stick are rigidity considerations. Regarding rigidity and the novel truss like design of the instant shaft, engineering principles have long evinced the strength of truss structures, especially where weight considerations are significant. Thus, the instant invention creates a light-weight stick, without sacrificing strength. Additionally, as important as strength considerations are to a sports stick, rigidity as opposed to flexure considerations, run hand in hand and often dictate the performance level of a sports stick. Prior art solid shafts exhibit a great amount of flexure due material considerations exhibited by solid materials. However, truss structures evince minimal flexure due the interplay of the materials expansion in to areas where cavities exist.
Further, the sports stick can be a lacrosse stick comprising a shaft wherein the shaft includes at least one internal portion containing an area for mounting a striking surface at least one cutaway area and an external surface and a striking surface. Additionally, the sports stick can be a hockey stick comprising a shaft wherein the shaft includes at least one internal portion containing an area for mounting a striking surface at least one cutaway area and an external surface and a striking surface.
The lack of flexure innate with a truss design serves to minimize the natural loss of energy occurring on the back or windup stroke during normal usage of the shaft. As such, the user progresses into the throwing stroke without the need to compensate for or overcome a huge loss of energy due to flexure. Thus, the lack of flexure allows the user more time and accuracy since the shaft will not flex during a shot and therefore the ball is more likely to arrive at its intended target.
Moreover, due to the ridged curved truss design, the instant invention is extremely durable and thus, unlike other tubular shaped handles, this design will not buckle and bend when dented under normal playing conditions. The truss system also allows for a slight twisting or rotation of the handle to allow the head to adjust to the playing surface when retrieving a ground ball or striking an object and colliding with any surface.
Therefore, the internal truss design, in conjunction with the external skin, provides bi-directional maximum strength with out exposure to injury to the user. Finally, there are no limitations to the internal truss shape or design as the truss can be configured to provide the maximum strength and ideal weight.
