as used herein , a chain - link fence ( also referred to as wire netting , wire - mesh fence , chain - wire fence , cyclone fence , hurricane fence , or diamond - mesh fence ) is a type of woven fence usually made from galvanized or lldpe - coated steel wire . the wires run vertically and are bent into a zigzag pattern so that each “ zig ” hooks with the wire immediately on one side and each “ zag ” with the wire immediately on the other . this forms the characteristic diamond pattern seen in this type of fence . as used herein , the term ball is defined as a round or roundish body , of various sizes and materials , either hollow or solid , for use in games . the term baseball is used to mean any type of ball which would assist a batter in developing hitting skills . this includes balls that do not meet major league baseball &# 39 ; s specifications for size , shape , weight , or material . it may be advantageous to practice for example with a smaller or a larger ball , or using a major league baseball . the major league baseball must be made with 108 stitches , must weigh about 5 ounces , and is generally about 9 inches in circumference . as used herein , the term karabiner or carabiner includes a shaped ring with or without a spring catch on one side , used for fastening stabilizing members to a fence or other suitable structure . the carabiner may include a spring or screw type mechanism for closing the ring to prevent accidental disengagement and allow for purposeful engagement and disengagement . the carabiner is defined herein as any releasable ring for connecting a stabilizing member to a fence . fig1 - 4 depict one non - limiting embodiment of baseball training device 10 as it is mounted to a cyclone fence 12 . the training device 10 is designed to easily attach and detach from an existing fence , as will be found in many schoolyards , homes , and other places where baseball is commonly practiced or played without the use of tools . in this embodiment , the training device is portable and ergonomically designed for human factors . such factors allow a user to control the height and location of the device to allow users of differing heights and abilities to mount the unit in a location which will present the user with a ball to hit at virtually any vertical position . as shown in fig1 - 4 , one non - limiting embodiment of the training device 10 includes post 16 . post 16 can have a cylindrical body . non - cylindrical posts are contemplated to be within the scope of the instant invention . the post 16 includes apertures 18 such that stabilizers 56 can be secured to the post 16 through the apertures 18 , for example by stabilizer loop 60 and also to fence 12 by connectors 52 . in this embodiment , there are two apertures , each aperture creating a through - hole in the post for attachment of the three stabilizers . referring to fig1 , for example , two stabilizers are looped through one aperture on post 16 and a third stabilizer is looped through the second aperture in the post . connectors 52 can be carabiners , for example , metal loops having gates used to quickly and reversibly connect components in safety critical systems . the gates can be spring loaded . further , configurations which include other known attachment means can be used to secure the stabilizers 56 to the inside or outside of post 16 and the connectors 52 to the stabilizers 56 or the fence 12 . post 16 includes foot 20 for engaging fence 12 . in this embodiment , foot 20 is configured in a u shape . the foot 12 engages the fence and prevents the post from becoming dislodged during use by engaging the supporting structure of the fence , such as the metal wires in a chain - link fence . other foot configurations for engaging the fence , such as , for example , three , four , or more prong configurations are contemplated to be within the scope of the present invention . a rotator such as wheel 24 is mounted to the opposite end of post 16 from the foot 20 . the wheel can include at least one aperture 28 and a mounting fastener 32 . the wheel assembly is mounted to the post 16 so that it can freely rotate in a plane substantially perpendicular to the post and parallel with the fence 12 . an axle or bearings , such as ball bearings , needle bearings and the like ( not shown ) can be used to mount the wheel 24 to the post 16 . any known means for rotatably mounting a wheel on a post are contemplated to be within the scope of the invention . cord 40 can include first terminal knot 36 and can be threaded through aperture 28 in order to secure one end of cord 40 to wheel 24 such that cord 40 exits wheel 24 at or near the centerline of the wheel . that is , cord 40 traces a substantially 90 degree path within aperture 28 through the wheel 24 such that cord 40 is substantially perpendicular to post 16 and parallel to fence 12 when it exits the wheel . the opposite end of cord 40 can be threaded through aperture or through - hole 44 in a ball 48 and secured by a knot 52 . other known conventional mechanical means to secure one end of the cord to the wheel and the other end to the ball are contemplated to be within the scope of the invention . the cord is positioned to present a batter 76 with a ball in an optimum hitting position for practice . the length of the cord , and the height of the device when mounted to a fence , can be adjusted to accommodate a wide range of batter needs . the cord can be fashioned from any flexible or semi - rigid material such as rope , fiberglass , aramid fiber , carbon fiber , braided metal and the like . the cord can be elastic or rigid . it will be known to those in the art that the cord material will have sufficient tensile strength and durability for proper operation of the device and for long term durability . in some embodiments , the cord can include a protective sheath , covering all or part of the cord for abrasion resistance , safety and durability . the protective sheath can comprise a polymeric material . in use , the training device can be assembled and disassembled in the field , or wherever a suitable fence is available . in this non - limiting embodiment , no tools are required . the user engages foot with the fence . while supporting the post , the user can attach each of the stabilizers to the fence in a roughly triangular pattern , that is , about 120 degrees apart . any pattern of stabilizers that maintains a stable structure may be utilized . ideally , the top stabilizer is connected first to remove the gravitational load off the post . the other stabilizers can be fastened to the fence in any order . in this way , the stabilizers act on the post to form a stable tripod structure which maintains the post substantially perpendicular to the fence or other suitable mounting surface . once attached , one or more stabilizers can be easily repositioned to optimize the tension in the stabilizers . such optimization may be desirable in order to maintain the device in a stable , optimal position for use . as shown in fig4 , when the stabilizers 56 and foot 20 are securely attached to the fence using connectors 52 , the device is self - supporting and ready for batter 76 to hit ball 48 with bat 72 . striking the ball with a bat causes the ball , the cord and the wheel to rotate in a 360 circular path 52 as shown in fig3 , until the energy is dissipated and the wheel stops or the batter strikes again . the ball can be hit repeatedly to develop the batter &# 39 ; s skills or to warm up before a game . when at rest , the ball will hang in a stable downward hitting position due to gravitational forces acting on the device . when the device is no longer required , it can be easily disconnected by disengaging the stabilizers and the foot from the fence . all structural components of the device can be molded or fabricated from any suitable durable structural materials , for example , a metal or polymeric material . suitable materials and manufacturing methods will be well known to those skilled in the art of structural , mechanical or materials engineering . a plurality of post geometries , stabilizer means , and attachment means are contemplated within the scope of the present invention . such post geometries , stabilizer means and attachment means will be well known to those of skill in the mechanical arts . although the invention herein has been described with reference to particular embodiments , it is to be understood that these embodiments are merely illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the disclosure herein .
a portable training apparatus for assisting a user in developing ball batting skills is provided for use by either right or left handed batters . the apparatus releasably attaches to an existing structure , such as a chain - link fence . a post has a foot and a plurality of stabilizing members for attaching the post to a fence . a rotational means supplies the user a ball to hit .