in the description like reference numbers appearing in the drawings and description designate corresponding or like elements among the different views . referring to fig1 a and 1b , a golfer is depicted holding a putter 1 . the head 1 c of the putter is positioned behind a golf ball 2 . the putter shaft 1 b is in sliding contact with a surface 12 a of a rod 12 portion of a training device 10 according to an embodiment . the training device 10 includes a laser 50 , first and second legs 14 , 15 that support the rod 12 . an arm 18 is attached to the rod 12 . an alignment device in the form of a laser light , or laser 50 is attached to an end of the arm 18 . a laser that can be used for this purpose is a laser sight , e . g ., fsm - 00qd - 140 , available from laserlyte , 30 n alamos drive , cottonwood , ariz . 86326 . the arm 18 can rotate about the attachment of the leg 14 and rod 12 . the device 10 helps train a golfer to move the head 1 c towards the golf hole , thereby striking the golf ball properly so that the ball moves towards the hole 3 . the device may be used in the following manner . the device is positioned relative to the golf hole so that laser light 50 a points at the golf hole 3 . when the laser light points at the hole 3 a longitudinal axis a of the rod 12 ( see fig2 a ) extends along a line parallel to the laser light 50 a . the ball 2 is positioned so that the laser light 50 a passes over the golf ball . in this orientation the putter 1 swung with the shaft 1 b sliding over the rod 12 through impact with the ball 2 will cause the ball 2 to move towards the hole 3 ( assuming no break in the putt ). additionally , the distance between the light 50 a and rod 12 is adjusted to account for the golfer &# 39 ; s swing and putter type . putters come in different varieties and golfers have a variety of putting styles . some golfers have upright swings ( feet closer to ball ), while others have flatter swings ( feet further away ). additionally , there are blade or tow putters , or central shaft putters . to accommodate different golf swings and / or putter types the device 10 has two features . first , the legs 14 , 15 have an overhang l ( see fig2 b ) that accommodates a central shaft - type putter , which may have a portion of the putter head 1 c to the left of the rod 12 in fig1 a ( a toe putter , by contrast , has the entire head 1 c to the right of the rod 12 in fig1 a . this is the putter type drawn in fig1 a ). second , the arm 18 , which holds the laser 50 , is rotated to accommodate a ball position relative to the rod 12 . for more upright swings the ball 12 is closer to the rod 12 and further away from the rod 12 for flatter swings . thus , by providing a rotating arm 18 and overhang the setup shown in fig1 a ( i . e ., ball 2 and putter head 1 c in line with laser light 50 a and shaft 1 b slides on rod 12 ) can be achieved for different putter types and golf swings . a more detailed description of the device in fig1 a - 1b is now provided with reference to fig2 a - 2b , and fig3 . fig2 a shows the rod 12 supported by first and second legs 14 , 15 . the legs are mirror images of each other , each one having a base 14 b , 15 b and a supporting portion 14 a , 15 a . the rod has a first end 12 a connected to the first leg 14 and a second end 12 b connected to the second leg 15 . the rod 12 and legs 14 , 15 are preferably made from a metal material . a polymer sleeve or sheath 13 may be placed over the putter shaft 1 b so that the metal surface of the rod 12 does not scrape against the putter shaft . an arm 18 has an attachment end 18 a and alignment end 18 b . the arm 18 is attached at its attachment end 18 a to the first leg supporting portion 14 a and rod first end 12 a by a coupling 30 ( a detailed view of the coupling 30 is provided in fig3 ). the coupling 30 enables the arm 18 to rotate about axis a of the rod 12 while restraining all motion in three translational directions and the other two rotational directions ( i . e ., there is one degree of freedom — rotation about axis a — for arm 18 relative to rod 12 ). the rod 12 longitudinal axis a passes through attachment end 18 a . the coupling 30 also connects the first leg 14 to the rod 12 first end 12 a . the alignment end 18 b includes a hole 51 for holding the laser 50 . rotation of the arm ( as indicated in fig2 b ) allows the golfer to position the laser 50 at a variety positions relative to the rod 12 to accommodate putter and / or swing types , as explained earlier . referring to fig3 , according to this particular embodiment , the coupling 30 may include two washers 32 a , 32 b , two flat head nuts 34 a , 34 b , and a threaded bolt 33 ( having a shank and head as shown ). other fastener types are envisioned . the coupling 30 further includes a hole 35 a formed in the attachment end 18 a of the arm 18 , a hole 35 b formed in the supporting portion 14 a of the leg 14 and a bore 31 formed at the first end 12 a of the rod 12 . the assembly order of these pieces is shown in the assembly view of fig3 . the shank of the bolt 33 passes through holes 35 a , 35 b and threads with mating threads formed in the bore 31 of the first end 12 a . washers 32 a and 32 b and nuts 34 a , 34 b provide a frictional engagement during rotation about axis a . with this assembly the arm 18 can rotate about axis a while also providing a modest degree of frictional resistance to rotation so that the arm can be placed at different locations when the device is adjusted to accommodate different golf swings or putter types . fig1 a and 1b show the arm 18 rotated to a position forward of the rod 12 or base 14 b and fig2 b shows the arm 18 rotated to a position rearward of the rod 12 . as mentioned earlier , legs 14 and 15 are mirror images of each other . the following description of leg 14 applies to leg 15 . leg base 14 b is a flat plate with a hole to receive a tee for holding the device 10 in place during use . a supporting portion 14 a extends upwardly from the base 14 b at a 90 degree angle . the flat plate provides support for the ( rod ) supporting portion 14 a in an upstanding manner ( see fig1 a ) sufficient so that when the rod 12 is connected to legs 14 , 15 the device is stable . the supporting portion 14 a is curved so that an upper end of the supporting portion 14 a ( where hole 35 b is formed ) extends at a right angle to the lower end near the base 14 b . the supporting portion 14 a is curved and right - angled and provides the overhang l as indicated in fig2 b . the overhang l ( measured from the forward edge of the plate to the rod 12 outer surface is between 2 and 6 inches ) accommodates different putter heads , including those where the shaft is centrally located . a method for putting a golf ball towards a target includes the steps of using a putter having a shaft , a rod having a rod axis , a laser and an arm connecting the laser to the rod , wherein a coupling between the rod and the arm permits rotation of the laser about the rod axis , adjusting a distance between the golf ball and the rod by rotating the laser about the rod axis , such that a light from the laser passes over the golf ball when the putter is positioned to strike the golf ball and the putter shaft rests on the rod , aligning the laser with the target , and putting the golf ball while the shaft of the putter slides along an outer surface of the rod . the above description of illustrated embodiments of the invention , including what is described in the abstract , is not intended to be exhaustive or to limit the invention to the precise forms disclosed . while specific embodiments of , and examples for , the invention are described herein for illustrative purposes , various modifications are possible within the scope of the invention , as those skilled in the relevant art will recognize . these modifications can be made to the invention in light of the above detailed description . the terms used in claims should not be construed to limit the invention to the specific embodiments disclosed in the specification .
a training device to improve a golfer &# 39 ; s putting ability . the device includes a guide rod supported by legs . an arm rotates about a longitudinal axis of the rod . the arm includes a targeting device , which allows the golfer to align the training device and golf ball with the hole . the golfer establishes club head and ball position relative to the rod suitable to his / her putting stance and putter type . the device is aligned with the hole by moving the rod based on the direction of the light emitted from the laser . when properly aligned movement of the putter along the rod sends the ball towards the hole .