as shown in the drawings , a bowling ball 20 , conventionally made of a hard material , defines a spherical outer surface 21 . a plurality of apertures 22 , 23 , 24 are conventionally drilled in the bowling ball 20 for receiving respectively the thumb 25 and two middle fingers 26 , 27 of the bowler &# 39 ; s hand 28 . the index finger 29 , little finger 30 , and the bowler &# 39 ; s palm 31 normally rest on and grip the outer surface 21 of the bowling ball 20 when the bowling ball is held by the bowler . the preferred embodiment of a bowling aid 35 embodying the present invention , as shown in fig1 - 8 , is a rigid sheath for application to the index finger 29 of the bowler &# 39 ; s hand 28 and is formed as a tubular main body 36 defining a bore 38 extending continuously therethrough from a first end finger receiving opening 39 to a second end opening 40 . the tip of the index finger of the bowler is inserted through the first opening 39 into the bore 38 , and is snugly held therein by a resilient insert sleeve 41 . a resilient cushion 42 is provided in the tubular sheath 36 for padding the upper portion of the bowler &# 39 ; s finger to provide a snug fit and prevent injury thereto . the insert 41 may be removable from the bowling aid . to this end , the insert 41 fits in a cavity 44 defined within the outer shell 36 , and dimensioned to receive the insert 41 . the insert 41 is held in the recess by an inwardly extending flange 45 spaced from the opening formed at the second end of the main body , and an internal shoulder 46 adjacent the outer end of the shell 36 . the insert 41 is positioned within the recess by compressing and inserting the insert through the aperture 40 formed in the end of the main body , and releasing the insert so that it expands to its normal dimensions and is securely held within the recess 44 . the insert can likewise be removed in the same manner . alternatively , the entire length of the sheath 36 can have resilient cushion 42 extending inside the sheath 36 from the first end finger receiving opening 39 to the second end opening 40 , as shown in fig6 a . the tip of the index finger of the bowler is inserted through the first opening 39 into the bore 38 , and is snugly held therein along its length by the resilient foam 42 , without the insert 41 being necessary . the resilient cushion 42 is provided in the tubular sheath 36 for padding the upper portion of the bowler &# 39 ; s finger along its entire length , and to provide a snug fit and prevent injury thereto . a bottom surface 49 of the sheath body 36 engages the surface 21 of the bowling ball 20 . in addition , an enlarged plate or paddle 48 can be integrally formed on the sheath body 36 to extend laterally outwardly from the sides and longitudinally outwardly the forward end of the sheath 36 . the plate or paddle 48 is formed with a bottom surface integral with bottom surface 49 of the sheath body 36 having a concave spherical curvature identical to the curvature of the outer surface 21 of the bowling ball 20 . the bottom surface 49 is preferably covered with a gripping material 50 , such as an elastomer or latex layer , to provide a frictional gripping engagement with the surface 21 of the ball 20 . the paddle 48 is integrally formed with and extends outwardly from the main body sheath 36 as an extension thereof . like the main body sheath 36 , the paddle is relatively rigid . the paddle preferably extends past the forward end of the sheath body 36 to an extent up to about 50 % of the length of the sheath body , and is generally square in shape . the shape of the paddle can be modified as desired by the bowler . a modified embodiment of the bowling aid of the present invention is shown in fig9 - 14 . in describing this embodiment , like elements to those described above will be indicated by similar reference numerals with the distinguishing suffix &# 34 ; a .&# 34 ; the alternative embodiment of the bowling aid ( fig9 - 14 ) includes a main rigid sheath body 36a for receiving the bowler &# 39 ; s index finger 29 and a second sheath 51 for receiving the little finger 30 . the two main sheaths 36a , 51 are attached together by a rigid bridge 52 extending between the index finger main body 36a and the little finger main body 51 adjacent the first ends thereof . the main body 36a for the index finger is made identically to the main body as described above , and includes a plate or paddle 48a and ball contact surface 49a . the main body 51 for receiving the little finger is constructed identically to the main body 36a for receiving the index finger , with necessary modifications made in light of the differences in size of the two fingers . the main body sheath 51 for receiving the little finger may or may not include a paddle , but does define a spherical concave ball contact surface 54 along its length and width . the bridge 52 connecting the index finger main body 36a and the little finger main body 51 is integrally formed with each of the main body sheaths , and defines a spherical contact surface ball 55 coextensive with the contact surfaces of the two main bodies , as shown in fig1 . the bridge 52 is formed by a thin , rigid plate defining a front edge 56 and a rear edge 58 . the front edge 56 lies between the finger sheaths 36a , 51 and forwardly of the finger receiving ends thereof . the rear edge 58 of the bridge 52 extends rearwardly from the sheaths to be under the palm 31 of the bowler &# 39 ; s hand . the ball contact surfaces 49a , 54 of the sheaths and bridge surface 55 coextensively engage the outer surface 21a of a bowling ball 20a when in use , as shown in fig1 . the bridge 52 also defines an upper surface 59 on which a thin cushion material 60 ( fig1 ) may be affixed to help ensure contact with the bowler &# 39 ; s hand during use . the cushion layer 60 can be made of a closed - cell foam which adapts to the individual shape of the bowler &# 39 ; s hand , yet has adequate firmness to maximize the bowler &# 39 ; s feel and control of the bowling ball . a further modified embodiment of the bridge is shown in fig1 . in describing this modification , reference characters similar to those used above will be employed with the distinguishing suffix &# 34 ; b .&# 34 ; in this modification , the bridge 52b is narrow and extends between the first ends of the index finger sheath 36b and the little finger sheath 51b . the palm of the bowler thus does not cover the bridge 52b . the bridge 52b essentially underlies the base of the knuckles of the bowler . this smaller bridge 52b also has a contact surface ( not shown ) having the same spherical curvature as the larger bridge member to ensure complete contact with the bowling ball during use . the contact surface of the bridge member as well as the index finger sheath 36b , paddle 48b , and little finger sheath 51b all have a gripping or frictional material applied thereto ( not shown ), to provide enhanced gripping characteristics . another modified embodiment of the bowling aid of the present invention is shown in fig1 . in describing this embodiment , like elements to those described above will be indicated by similar reference numerals with the distinguishing suffix &# 34 ; c .&# 34 ; this alternative embodiment of a bowling aid 35c embodying the present invention , as shown in fig1 , includes a sheath 36c which is identical to the sheath 36 described above , except that the sheath is sized and dimensioned to be worn on a bowler &# 39 ; s little finger . this version of the a rigid sheath 36c for application to the little finger can have a paddle 48c as desired . in use , the bowling aid of the present invention increases the ball contact surface area of the bowler &# 39 ; s finger , which in turn enhances the bowler &# 39 ; s ability to generate the lift , turn , axis rotation and axis tilt upon release of the bowling ball . the bowling aid , when used , allows the fingers of the bowler to stay on the ball longer , but creates earlier thumb exit , and in combination with the increased surface area and frictional contact between the bowling aid and the bowling ball , assists the bowler in generating lift and turn with natural wrist action through the release , and thus increasing ball revolutions and helping to obtain proper axis rotation and axis tilt , thereby helping to improve the bowler &# 39 ; s score . given the fact that the middle finger substantially controls the turn performance , and the ring finger substantially controls the lift performance , the bowling aid can be worn only on the index finger to improve a bowler &# 39 ; s turn performance , and can be worn only on the little finger to improve the bowler &# 39 ; s lift ( revolution ) performance . the combination index and little finger bowling aids 35 , with the rigid bridge connecting the two , as described above , can be used to improve both lift and turn performance simultaneously . generally , the bowling aid of the present invention works in a number of ways to strengthen any of a variety of weaknesses from which a bowler may suffer . the bowling aid can stabilize the bowling ball in the user &# 39 ; s hand , provide a feel for a better overall swing , and assist in proper release for improved lift , turn , axis rotation and axis tilt . although the present invention has been described with a certain degree of particularity , it is understood that the present disclosure has been made by way of example , and changes in detail or structure may be made without departing from the spirit of the invention , as defined in the appended claims .
a bowling aid adapted to be mounted on either the bowler &# 39 ; s index or little finger . the aid is a rigid sheath into which the bowler &# 39 ; s finger is inserted . appropriate padding is provided in the sheath for gripping and protecting the finger . on the outer end of the sheath there is provided a plate which extends outwardly from the sheath and is provided with a concave surface with a frictional coating thereon for assisting the bowler in gripping the bowling ball . the concave surface and friction coating extend along the length and width of the sheath . the bowler presses the plate and the length and width of the sheath against the surface of the ball during bowling to generate enhanced grip .