the present invention will now be described more fully with reference to the accompanying drawings in which alternate embodiments of the invention are shown and described . it is to be understood that the invention may be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein . rather , these embodiments are provided so that this disclosure may be thorough and complete , and will convey the scope of the invention to those skilled in the art . with reference initially to fig1 , one embodiment of the includes a golf swing training device 10 having an elongate shaft 12 with a proximal end portion 14 for holding the device by a user , an opposing distal end portion 16 , and an intermediate portion 18 therebetween . a grip 20 may be affixed at the proximal end portion 14 . a first coupling 22 is affixed to the shaft 12 generally within the proximal end portion 14 , but may be located as desired along the shaft length . a second coupling 24 is affixed the shaft 12 within the intermediate portion 18 , by way of example for the embodiment herein described . a stop 26 is attached to the shaft 12 at the distal end portion 16 , herein illustrated at an extreme end 28 of the shaft . the shaft 12 carries a first sliding element 30 for movement between the first coupling 22 and the second coupling 24 , and a second sliding element 32 for movement between the second coupling 24 and the stop 26 . the sliding elements 30 , 32 have sufficient weight for responding to centrifugal forces during the swinging of the shaft 12 by a user when holding the grip 20 in simulating a golf swing . with continued reference to fig1 , the first sliding element 30 is initially coupled to the first coupling 22 and the second sliding element 32 is coupled to the second coupling 24 prior to a swinging of the shaft in a training exercise . as will be further detailed later in this section , the first sliding element 30 is released from the first coupling 22 by a first centrifugal force generated by the swinging of the shaft 12 during a first swinging motion ( known in golfing as a backswing ). the first sliding element 30 accelerates toward the second coupling 24 and makes a first distinctive sound upon contact with a back surface 34 of the second coupling . the second sliding element 32 , initially coupled to the second coupling 24 , remains coupled during the backswing and is released during a second swinging motion ( known in golfing as a downswing ) by a second centrifugal force generated during the second swinging motion of the shaft 12 . the second sliding element 32 accelerates toward the stop 26 and makes a second distinctive sound when contacting the stop . for the embodiment of the device 10 , herein described with reference to fig1 , the shaft 12 comprises a circular cross section , and has a constant cross section along lengths of the shaft having the sliding element movements . with reference to fig2 a , and 3 , one embodiment of the grip 20 , herein described by way of example , includes a plurality of protrusions 36 that extend outwardly from a longitudinal axis 38 of the grip and are arranged for receiving multiple finger webs 40 biased against them in guiding a hand 42 of the user 44 , as illustrated with reference to fig4 - 6 , for gripping the shaft 12 proximal end portion 14 , earlier described with reference to fig1 . in one embodiment , the grip 20 may comprise three protrusions 46 for receiving the hand 42 that for a right - handed golfer will be the top hand on the shaft 12 . the three protrusions 46 extend from a first side 48 of the grip 20 for receiving three webs 40 between four fingers of the top hand . with reference again to fig2 a , and 3 , and to fig7 and 7 a , another protrusion 52 for receiving a web 54 between fingers of the bottom hand 56 of the user 44 . in one desired arrangement , and as illustrated with reference to fig8 , the longitudinal axis 38 of the grip 20 ( coincident with the axis of the shaft 12 ) and an a centerline 58 through a palm of the top hand 42 form approximately a forty five degree angle 60 . with reference again to fig2 - 4 , a fourth protrusion 62 extends from a second side 64 radially offset from the first side 48 for receiving a thumb 66 of the top hand 42 , as illustrated with reference again to fig5 , by way of example . further , an indentation 68 is provided on the second side 64 for receiving a thumb of the bottom hand 56 . a second indentation 69 is also provided on the grip second side 64 for use by the thumb of the top hand 52 while the thumb is biased against the protrusion 62 . with reference again to fig1 , the couplings 22 , 24 and the sliding elements 30 , 32 may have various embodiments within teachings of the present invention . by way of example , and with reference to fig9 - 11 , the couplings 22 , 24 and the sliding elements 30 , 32 may be magnetically coupled with both being magnetized , one having a magnet and the other metallic , or the like . for the embodiment herein described by way of example , the sliding element comprises a plastic body 70 with a metallic ring 72 on a coupling side of the element . the sliding elements 30 , 32 may be modified in weight by adding ballast material to the plastic body , by way of example , or by selecting a desired weighted element . the couplings 22 , 24 are magnetized for the embodiment herein described . alternatively , and as will come to those of skill in the art now having the benefit of the teachings of the present invention , friction or latching connections 25 may be used , such as an adhesive or velcro , illustrated with reference again to fig1 . by way of example for the embodiment herein described for the gold training device 10 , a first coupling force between the first coupling 22 and the first sliding element 30 is less than a second coupling force between the second coupling 24 and the second sliding element 32 , thus less centrifugal force is required for releasing the first sliding element than for releasing the second sliding element . with continued reference to fig9 - 11 , for the embodiment herein described , the first and second sliding elements 30 , 32 comprise the body 70 having a bore 74 extending therethrough and dimensioned for sliding along the shaft 12 . it may be desirable to modify the friction between the first and second sliding elements 30 , 32 and the shaft 12 . one embodiment for modifying the frictional force may include having each sliding element 30 , 32 formed from two parts 70 a , 70 b and having the shaft 12 slidably received therebetween . by compressing the shaft 12 between the two parts 70 a , 70 b using connecting screws 76 , a desired sliding friction between the sliding elements and the shaft is achieved . as a result and by way of example when simulating a golfing swing , the releasing of the sliding elements and the sliding along the shaft may be modified to accommodate a desired circumstance or user characteristic . the coupling forces between the first coupling and the first sliding element and between the second coupling and the second sliding element may be preset for a desired swinging movement . yet further with regard to training a swing , and with reference again to fig1 , an alignment element 78 may be carried by the shaft 12 , which element may have a shape of a golf club head for the golf training device 10 herein described by way of example . in addition , a rod 80 may be carried within the shaft and longitudinally extendable from the proximal end portion 14 for viewing by the user during a swinging movement for identifying a swing plane therefor , desirable in one training exercise for a golf swing . by way of example , one method of use may include the training of a full golf swing . with reference now to fig1 and 13 , during one desired swing , two impact or percussion sounds will be heard . with reference to fig1 and to swing locations points a - f , the first sound is heard during the backswing at point e in the backswing as the first sliding element 30 contacts the second coupling 24 . in order for the user to hear the noise associated with the backswing ( the first sound ), the user will need to “ set ” the club properly . for the example herein described , the first sliding element 30 will begin to leave the first coupling 22 near swing point d . this may require a cocking of the wrists and a slight increase in tempo during the backswing , illustrated by way of example with reference to angles α and β for swing points d and e , respectively . with reference again to fig1 , the second impact sound is desirably heard at point j . this is created when a desired tempo is used . by way of example , imagine a cracking of a whip . this allows the second sliding element 32 to be released from the second coupling 24 , as illustrated at about point i , to slide down the shaft 12 and hit the stop 26 . typically , an un - cocking of the wrists as illustrated with angles β to α in the downswing will cause a desired release of the second sliding element 32 . the desired setting of the club going back and the desired releasing , or un - cocking , on the downswing provides a desirable maximum club head acceleration . as earlier described with reference to fig9 - 11 , not every golfer swings with the same speed or force . with this in mind , the first and second slidable elements 30 , 32 will be adjustable so that the beginner , as well as the seasoned professional will be allowed to train using the device 10 . by way of example for one embodiment herein describe , the first sliding element 30 may require less centrifugal force to allow it to break free from its starting position . the second sliding element 32 may be set to require significantly more centrifugal force to be applied during the downswing to allow it to break free and contact the stop 26 at the end of the shaft 12 . as illustrated with reference to fig1 , an alternate embodiment of the device 10 , identified as device 11 may include a tapered golf shaft 12 and the two sliding elements 30 , 32 to move freely after they have been released from their respective starting positions 82 , 84 . as above described with reference to fig1 , the stop 26 is carried at the shaft distal end 14 opposite the grip 20 . the stop 26 prevents the first and second sliding elements 30 , 32 from coming loose from the shaft 12 and provides a distinct sound at the time of the second impact portion of the swing creating the sound made during the downswing . the second sliding element 32 stops the first sliding element 30 when the user makes the desired backswing . the first sound is made when the first element 30 hits the second element 32 during the backswing . a release mechanism 86 ( a friction barrier by way of example ) described with reference to fig1 - 17 holds the first sliding element 30 in place during the completion of the backswing and releases both the first and second slidable elements for moving toward the stop 26 when sufficient force is applied during the downswing . as illustrated by way of example with reference to fig1 , one embodiment may include the sliding element 30 , 32 having the bore 74 forced into a taper of the tapered shaft 12 varying the frictional contact by pushing the element to a first , second , third indicator mark 88 made on the shaft . as illustrated with reference to fig1 , notches 90 and tabs 92 may be carried by the shaft 12 , whether tapered or not , and by the surface of the bore 74 , with a degree of releasing force countering a centrifugal force based on the number of notches engaged . yet further , a friction sleeve 94 may be employed for establishing a preset frictional contact 95 between the element 30 , 32 and the shaft 12 , as illustrated by way of example with reference to fig1 . as above described , during a desired swing , two impact or percussion sounds are heard . with reference to fig1 and 18 , the first sound is heard during the backswing at point e . as above described , in order for the user to hear the noise associated with the backswing ( the first sound ), the user will need to “ set ” the club properly . this may require a cocking of the wrists and a slight increase in tempo during the backswing , by way of example . the second impact sound is heard at point j as illustrated with reference to fig . 19 . the sliding elements 30 , 32 slide down the shaft 12 together and hit the stop 26 . this will be when the wrists un - cock in the downswing . the desired setting of the club going back and the desired releasing , or un - cocking , on the downswing permits achieving maximum club head acceleration . as above described , not every golfer swings with the same speed or force . therefore , frictional contact of the first and second sliding elements 30 , 32 with the shaft 12 may be adjustable so that the beginner , as well as the seasoned professional will be allowed to practice with this device . many modifications and other embodiments of the invention will come to the mind of one skilled in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings . therefore , it is to be understood that the invention is not to be limited to the specific embodiments disclosed , and that modifications and alternate embodiments are intended to be included within the scope of the appended claims .
a golf swing training aid includes a shaft having two sliding elements which are moved from initially coupled positions on the shaft to impact positions during the backswing and downswing make distinctive sounds at impact positions to aid in setting the club and hinging the shaft when executing the backswing and lagging of the club during the downswing . grip protrusions are biased against webs of the fingers for enhance power generated during the swing .