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This application is a continuation of U.S. patent application Ser. No. 10/229,875, filed Aug. 28, 2002 and entitled ‘System For Adapting A Sports Implement’, the entire disclosure of which is incorporated by reference herein as if being set forth in its entirety.
The present invention pertains to adjusting the weight of a sports implement, and more particularly to adjusting the weight of the barrel end of a baseball bat to allow the weight to be tailored to an individual batter.
The size, weight, and shape of a baseball bat effects the kinematics of the swing of the baseball bat by a batter. The weight of the barrel end affects the ability of the batter to swing the bat rapidly enough to meet a pitched ball. A heavier barrel end requires greater strength to achieve the same barrel speed as a lighter barrel end. A heavier barrel end, however, carries greater momentum when a pitched baseball is struck. In addition to the weight of the barrel end of the bat, the length of the bat also affects the ability of a batter to both control the swing, as well as generate an effective barrel velocity at impact with a pitched ball.
Typical baseball bats are formed from a substantially homogenous material, such as wood or aluminum. Some bats are formed from multiple materials, such as using a fiberglass handle with an aluminum head. Notwithstanding, these bats are formed with a fixed weight of the barrel end, fixed length, and fixed grip size.
In addition to affecting the swing of the bat at a pitched ball, it is typical for a batter to desire a heavier barrel end of the bat for practice swings, to both build up and stretch the muscles used for swinging the bat. To this end, doughnuts may be provided. Doughnuts are toroidal shaped weights that may be placed around the barrel end of the bat to add weight to the barrel. The use of a doughnut precludes the ability of the batter to actually hit a ball when the doughnut is on the bat, since the doughnut does not provide a uniform hitting surface.
The present invention is a sports implement for hitting a pitched ball or the like. The contact end of the sports implement is adapted to allow the selective engagement of varying weights or contact extensions, hereinafter further referred to collectively as attachments, to the sports implement, allowing weight and/or length parameters of the sports implement to be varied as desired for individual users of the sports implement, or as desired at various times by an individual user.
The barrel end of the sports implement may be provided with a system for allowing weights in the barrel end of a baseball bat to be easily substituted to allow varying the barrel weight of a bat, without varying the hitting surface of the bat. Such a system may include weights having a smaller diameter than the contact surface of the sports implement, such that the weights nested within the end of the sports implement.
The attachment could also have an outer size and shape consistent with the sports implement, allowing the attachment to form a portion of the contact surface of the sports implement.
The attachment may be engaged to the sports implement by any method however the use of a threaded joint as a bayonet joint allows rapid engagement and removal of an attachment from the sports implement.
Biasing means may be provided to ensure that an attachment engaged to a sports implement remains engaged until such time as a user decides to remove the attachment. The biasing means may include an elastic element urging portion of the attachment and the sports implement into contact, or creating a friction or other retaining force to maintain engagement of the attachment to the sports implement.
Understanding of the present invention will be facilitated by consideration of the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings, in which like numerals refer to like parts:
FIG. 1 illustrates a sports implement having a female socket receptacle for engaging a weight to the end of a sports implement;
FIG. 2 illustrates a weight for a sports implement where the weight nests in the end of the sports implement without forming a portion of the contact surface of the sports implement:
FIG. 3 illustrates a sports implement having a female socket formed within a weight for engaging a post on the end of a sports implement;
FIG. 4 illustrates a sports implement having a male post with retention pins nested within an end of a sports implement;
FIG. 5 illustrates a sports implement having a threaded socket on the end of the sports implement for receiving a male threaded post formed on a weight;
FIG. 6 illustrates the use of a pair of friction rings on the joint surfaces between an attachment and a sports implement, with the sports implement shown in cross section and the attachment shown in profile;
FIG. 7 illustrates the use of serrated surface features on the engagement faces between a weight and a sports implement; and
FIG. 8 illustrates an intermediate engagement device formed to allow the engagement features to be added to an attachment or sports implement rather than formed integrally with the attachment or sports implement.
It is to be understood that the figures and descriptions of the present invention have been simplified to illustrate elements that are relevant for a clear understanding of the present invention, while eliminating, for the purpose of clarity, many other elements found in sporting implement systems and devices. Those of ordinary skill in the art may recognize that other elements and/or steps are desirable and/or required in implementing the present invention. However, because such elements and steps are well known in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements and steps is not provided herein. The disclosure herein is directed to all such variations and modifications to such elements and methods known to those skilled in the art.
In FIG. 1, wherein like numbers represent like elements, there is shown a sports implement 2 in the form of a baseball bat 4. The sports implement may have a grip end 6 and a contact end 8. A weight 10 or other attachment may be provided with a method for engaging the weight to the contact end of the sports implement. In the configuration shown in FIG. 1, the method for engaging comprises a receptacle 12 formed in the tip end 14 of the sports implement. The receptacle may be a bore 16 drilled into the end of the sports implement, allowing a cylindrical portion 18 of the weight 10 to be engaged within the bore 16. A retention pin 20 or pins may be provided on the sidewall 22 of the cylindrical portion 18. A retention channel 24 may be provided on a sidewall 26 of the bore 16. The retention channel 24 may have a first leg 28 and a second leg 30, and a portion 32 connecting the first leg 28 and the second leg 30. The first leg may extend to an opening 34 in the end of the bore 16, allowing a retention pin 20 to slide into the retention channel 24 when the cylindrical portion of the weight is engaged into the bore. An elastic element 38 such as a spring may be provided at the bottom of the bore to resist engagement of the cylindrical portion of the weight into the bore. The second leg 30 of the retention channel may be parallel to the first leg 28, without extending to the opening 34, such that the cylindrical portion of the weight and the retention pin may be forced into the bore, and then twisted to move the retention pin 20 into the second leg 30. Alternatively, the second leg 30 may be orthogonal to the long axis of the sports implement, such that when the retention pins are in the second leg, such that the engagement faces (26, 28) remain in tight contact. The elastic element may then force the retention pin against the end of the second leg. As shown in FIG. 2, the weight may be formed such that it does not form a contact surface on the sports implement.
As shown in FIG. 3, the bore 32 may be formed into the attachment, shown as a barrel extension 34, with a cylindrical post section 36 extending from the sports implement 2. An elastic element 38 may be provided around the periphery of the engagement end of the sports implement to both provide a biasing function for engagement of the retention pin 40 into the retention channel 42, as well as to provide a smooth exterior contact surface 44.
As shown in FIG. 4, the attachment may be selected so as to have an outer diameter greater than the diameter of a pocket 402 on the end of the sports implement 2. A post having retention pins 406 may be located in the pocket 402, such that engagement of an attachment within the pocket 402 allows the attachment to nest within the end of the sports implement 2. Alternately, the post 404 may be formed with male threads (not shown) on the exterior of the post, allowing an attachment having female threads to be threadedly engaged to the post 404. A retention feature, such as a friction ring elastic element, or other device as described in this specification may be provided to ensure retention of the attachment onto the end of the sports implement.
As shown in FIG. 5, the attachment 500 may be joined to the sports implement using a threaded connection 502. The attachment 500 may form a portion of the contact surface 504 of the sports implement 2, such that varying the length of the attachment 500 allows variation of the length of the sports implement 2, as well as variation of the area of the contact surface 504 of the sports implement. A bore 506 may be drilled and tapped with female threads 508 in the end of the sports implement 2. A retention ring 510, such as a rubber gasket, may be provided adjacent to the periphery of a contact face to provide sufficient friction between the attachment 500 and the sports implement 2 to prevent the attachment 500 from rotating and loosening the threaded connection in an undesired fashion. The attachment 500 may be provided with surface features 512 such as grooves or knurling (not shown) to allow a stronger grip on the attachment when attaching or detaching the attachment 500 from the sports implement 2.
As shown in FIG. 6, when a bayonet fitting (retention pin and retention channel) is used for the connection between the attachment 600 and the sports implement 2, care must be shown with regard to the design of the retention channel 602. The retention pins 604 will exert a force against the retention channel 602 in an amount related to the mass of the weight and the speed and acceleration of the attachment 600. Thus, the retention pins 604 must be of sufficient size and strength to prevent failure of the pins 604, which could result in an undesired separation of the attachment 600 from the sports implement 2.
Furthermore, the design of the retention channel 602 must address the force generated by the acceleration of the weight on the end of the bat, which may tend to force the attachment 600 away from the sports implement 2, creating a gap between the attachment 600 and the sports implement 2 where the attachment 600 is used to form a portion of the contact surface 606 of the sports implement 2. The use of an L-shaped retention channel 608 allows the attachment to be snugly mounted against the sports implement 2, but may not provide a positive detent to ensure retention of the attachment 600 to the sports implement 2. A friction ring 610, such as a thin rubber washer or a pair of rubber washers may be added to the end surfaces 612, 614 of the attachment 600 and/or sports implement 2 to improve the retention of the attachment 600 to the sports implement 2. Alternately, serrated surface features 700, such as shown in FIG. 7, may be implemented to provide a positive detent where the retention channel 702 is not shaped to provide such a detent. A serrated surface feature 704, 706 formed from an elastic material, such as a spring steel, rubber, or other elastomer, may be provided on contact faces on the attachment 700 and sports implement 2. Engagement of the serrated surface features may require the two serrated surfaces to deform to allow rotation of the retention pins into the lateral legs of the retention channel, such that the contact between the serrated surfaces provides an anti-rotation force when the attached 700 is engaged to sports implement 2. Proper design of the serrated surface features allows a tight joint to be accomplished, allowing the weight to form a portion of the contact surface without an undesirable gap being present between the attachment and the sports implement 2. The serrations may be saw tooth or wave shaped.
Although the engagement means has heretofore been illustrated as integral to the sports implement or to the attachment, the engagement means may be also formed through fabrication of an intermediary engagement device formed to be joined to the sports implement or to an attachment. As shown in FIG. 8, a male engagement device 802 may be provided with male threads 804 at one end and retention pins 806 at an opposite end. An attachment 800 may thus be formed with a bore 808 which is internally threaded 810 to receive the male engagement device 802. This allows simpler forming tasks to be required to adapt the end of the sports implement 2 for engagement to an attachment 800. Also, a female engagement device 810 may be formed having external threads 812, and a central bore 814 having a retention through 816 and biasing element 818, such as a spring. A sports implement 2 may thus be adapted for receiving the female engagement device 810 by drilling and threading 820 a bore in the engagement face 822 of the sports implement. The use of intermediate engagement devices 802, 810 may allow the implementation of attachments according to the present invention to sports implements which were previously manufactured, by allowing basic machining (drilling and threading) to be used to adapt the sports implement and/or attachment for implementation of attachments according to the present invention.
As is apparent from the above description, the benefits of the present invention are not limited to baseball bats, but extend to other sports implements used to impact thrown or flying objects, such as, but not limited to, softball bats or cricket bats.
Those of ordinary skill in the art may recognize that many modifications and variations of the present invention may be implemented without departing from the spirit or scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.