with reference now to the drawings , and in particular to fig1 through 11 thereof , a new golf swing improvement device embodying the principles and concepts of the present invention and generally designated by the reference numeral 10 will be described . more specifically , it will be noted that the golf swing improvement device 10 comprises a cylindrical sleeve member 20 having a circular bore 20c therethrough adapted to receive a shaft 3 of a golf club 2 , and a shaft contact means 40 provided within the circular bore 20c for contacting and hugging the shaft 3 of the golf club 2 , whereby the cylindrical sleeve member 20 is free to slidably travel along the length of the shaft 3 of the golf club 2 during a swing thereof . as best illustrated in fig1 it can be shown that the golf swing improvement device 10 is intended for use on a golf club 2 having a straight or tapered shaft 3 with a handle 4 at one end of the shaft 3 and a head 5 at an opposite end . as best illustrated in fig2 through 4 , it can be shown that the cylindrical sleeve member 20 has a top surface 20a , a bottom surface 20b , and a circular bore therebetween 20c . the cylindrical sleeve member 20 is preferably formed of aluminum . the cylindrical sleeve member 20 comprises a pair of semi - cylindrical members 21 each having a planar surface 22 , a convex surface 23 , a semi - circular top surface 24 , and a semi - circular bottom surface 25 . the planar surface 22 has a semi - circular groove 26 therein extending from the semi - circular top surface 24 to the semi - circular bottom surface 25 . the semi - circular groove 26 has a pair of axially aligned cavities 27 therein . the semi - circular top surface 24 and the semi - circular bottom surface 25 each have a semi - annular groove 26 therein . the semi - annular groove 26 is undercut to form a semi - annular lip 29 . the pair of semi - cylindrical members 21 are mateably joined to form a cylindrical sleeve member 20 having a circular bore 20c therethrough and form an annular groove 20d with an annular lip 20e in each of the top surface 20a and the bottom surface 20b . a fastening means 30 is provided for joining the pair of semi - cylindrical members 21 to form the cylindrical sleeve member 20 . the fastening means 30 joins the pair of semi - cylindrical members 21 around the shaft 3 of the golf club 2 whereby the cylindrical sleeve member 20 is slidably mounted on the shaft 3 of the golf club 2 . the fastening means 30 comprises a snap ring 32 fitted within the annular groove 20d and under the annular lip 20e of each of the top surface 20a and the bottom surface 20b of the cylindrical sleeve member 20 . the shaft contact means 40 comprises a ball bearing 41 protruding from each of the pair of axially aligned cavities 27 into the circular bore 20c of the cylindrical sleeve member 20 . the ball bearing 41 may be formed of either steel or nylon . a projection spring 42 is located within each of the pair of axially aligned cavities 27 and is positioned behind the ball bearing 41 whereby the projection spring 42 presses the ball bearing 41 against the shaft 3 of the golf club 2 . as such , the cylindrical sleeve member 20 is free to slidably travel along the length of the shaft 3 of the golf club 2 during a swing thereof . a ball bearing retention means 50 is provided for retaining the ball bearing 41 within each of the pair of axially aligned cavities 27 while joining the pair of semi - cylindrical members 21 around the shaft 3 of the golf club 2 . the ball bearing retention means 50 comprises a pin ( not shown ) inserted through a pin hole 52 provided in each of the pair of semi - cylindrical members 21 , whereby the pin compresses the ball bearing 41 into each of the pair of axially aligned cavities 27 . the pin hole 52 extends from the semi - circular top surface 24 of each of the pair of semi - cylindrical members 21 to the semi - circular bottom surface 25 , is provided adjacent the semi - circular groove 26 provided in each of the pair of semi - cylindrical members 21 , and is axially aligned and contiguous with the pair of axially aligned cavities 27 . a second embodiment of the present invention is illustrated in fig5 through 8 . the second embodiment is similar to the first embodiment in that the second embodiment comprises a cylindrical sleeve member 120 having a circular bore 120c therethrough adapted to receive a shaft 3 of a golf club 2 , and a shaft contact means 140 provided within the circular bore 120c for contacting and hugging the shaft 3 of the golf club 2 , whereby the cylindrical sleeve member 120 is free to slidably travel along the length of the shaft 3 of the golf club 2 during a swing thereof . the cylindrical sleeve member 120 has a top surface 120a , a bottom surface 120b , and a circular bore 120c therebetween . the cylindrical sleeve member 120 comprises a pair of semi - cylindrical members 121 each having a planar surface 122 , a convex surface 123 , a semi - circular top surface 124 , and a semi - circular bottom surface 125 . the planar surface 122 has a semi - circular groove 126 therein extending from the semi - circular top surface 124 to the semi - circular bottom surface 125 . the semi - circular groove 126 has a pair of axially aligned cavities therein 127 . a first of the pair of semi - cylindrical members 121 has a plurality of holes 128 therethrough extending from the convex surface 123 to the planar surface 122 . a second of the pair of semi - cylindrical members 121 has a plurality of threaded holes 129 therethrough extending from the planar surface 122 to the convex surface 123 . the pair of semi - cylindrical members 121 are mateably joined to form a cylindrical sleeve member 120 having a circular bore 120c therethrough such that one each of the plurality of holes 128 is aligned with one each of the plurality of threaded holes 129 . a fastening means 130 is provided for joining the pair of semi - cylindrical members 121 to form the cylindrical sleeve member 120 . the fastening means 130 joins the pair of semi - cylindrical members 121 around the shaft 3 of the golf club 2 whereby the cylindrical sleeve member 120 is slidably mounted on the shaft 3 of the golf club 2 . the fastening means 130 comprises a threaded fastener 132 extending through one of the plurality of holes 128 and threadingly mating with one of the plurality of threaded holes 129 . the shaft contact means 140 comprises a button 141 protruding from each of the pair of axially aligned cavities 127 into the circular bore 120c of the cylindrical sleeve member 120 . the button 141 has a concave contact surface 141a . a projection spring 142 is located within each of the pair of axially aligned cavities 127 and is positioned behind the button 141 whereby the projection spring 142 forces the concave contact surface 141a of the button 141 against the shaft 3 of the golf club 2 . as such , the cylindrical sleeve member 120 is free to slidably travel along the length of the shaft 3 of the golf club 2 during a swing thereof . a button retention means 150 is provided for retaining the button 141 within each of the pair of axially aligned cavities 127 while joining the pair of semi - cylindrical members 121 around the shaft 3 of the golf club 2 . the button retention means 150 comprises a pin ( not shown ) inserted through a pin hole 152 provided in each of the pair of semi - cylindrical members 121 and along a groove 141b provided in the concave contact surface 141a of the button 141 , whereby the pin compresses the button 141 into each of the pair of axially aligned cavities 127 . the pin hole 152 extends from the semi - circular top surface 124 of each of the pair of semi - cylindrical members 121 to the semi - circular bottom surface 125 , is provided adjacent the semi - circular groove 126 provided in each of the pair of semi - cylindrical members 121 , and is axially aligned and contiguous with the pair of axially aligned cavities 127 . as best illustrated in fig1 and fig9 through 11 , it can be shown that an impact member 60 is provided around the shaft 3 of the golf club 2 adjacent the head 5 of the golf club 2 . the impact member 60 is positioned intermediate the head 5 of the golf club 2 and the cylindrical sleeve member 20 so as to protect the head 5 of the golf club 2 from impact by the cylindrical sleeve member 20 as the cylindrical sleeve member 20 slidably travels along the length of the shaft 3 of the golf club 2 during a swing thereof . the impact member 60 has an impact surface 60a which receives the impact of the cylindrical sleeve member 20 . the impact member 60 comprises a pair of semi - cylindrical impact members 62 each having a semi - circular groove 63 therein . the pair of semi - cylindrical impact members 62 are mateably joined to form a cylindrical impact member 61 having a circular bore 61a therethrough adapted to receive the shaft 3 of the golf club 2 . the cylindrical impact member 61 is t - shaped wherein the cylindrical impact member 61 has a shoulder 61b adjacent the impact surface 60a . a joining means 64 is provided for joining the pair of semi - cylindrical impact members 62 around the shaft 3 of the golf club 2 . an elastomer ring 70 is provided which may be placed around the shaft 3 of the golf club 2 adjacent the impact surface 60a of the impact member 60 so as to reduce the noise generated when the cylindrical sleeve member 20 contacts the impact surface 60a of the impact member 60 . in use , the pair of semi - cylindrical members 21 are mateably joined around the shaft 3 of the golf club 2 by the fastening means 30 to form the cylindrical sleeve member 20 . the pin ( not shown ) is removed from the pin hole 52 such that the shaft contact means 40 is pressed against the shaft 3 of the golf club 2 by the projection spring 42 . as such , the cylindrical sleeve member 20 is free to slidably travel along the length of the shaft 3 of the golf club 2 . before a user thereof swings the golf club 2 , the golf swing improvement device 10 is slidably positioned adjacent the handle 4 . while swinging the golf club 2 , the cylindrical sleeve member 20 slidably travels down the shaft 3 and contacts the impact member 60 . as such , a golfer can establish the &# 34 ; impact / power point &# 34 ; of his or her swing whereby during a correct swing of the golf club 2 , the cylindrical sleeve member 20 will contact the impact member 60 at precisely the same time that the head 5 of the golf club 2 contacts a golf ball ( not shown ). as to a further discussion of the manner of usage and operation of the present invention , the same should be apparent from the above description . accordingly , no further discussion relating to the manner of usage and operation will be provided . with respect to the above description then , it is to be realized that the optimum dimensional relationships for the parts of the invention , to include variations in size , materials , shape , form , function and manner of operation , assembly and use , are deemed readily apparent and obvious to one skilled in the art , and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention . therefore , the foregoing is considered as illustrative only of the principles of the invention . further , since numerous modifications and changes will readily occur to those skilled in the art , it is not desired to limit the invention to the exact construction and operation shown and described , and accordingly , all suitable modifications and equivalents may be resorted to , falling within the scope of the invention .
a new golf swing improvement device for helping a golfer determine the impact point of his or her golf swing . the inventive device includes a cylindrical sleeve member having a circular bore therethrough adapted to receive a shaft of a golf club , and a plurality of spring - biased shaft contact members provided within the circular bore for contacting and hugging the shaft of the golf club , whereby the cylindrical sleeve member is free to slidably travel along the length of the shaft of the golf club during a swing thereof . the shaft contact members compensate for the taper in the shaft of the golf club and allow the cylindrical sleeve member to slidably travel concentrically along the shaft of the golf club between the handle and the head .