US2006009305A1PendingUtilityA1

Putter heads

Individually held — no corporate assignee on recordPriority: Oct 21, 2002Filed: Oct 21, 2003Published: Jan 12, 2006

Est. expiryOct 21, 2022(expired)· nominal 20-yr term from priority

Inventors:Norman Matheson Lindsay

A63B 60/00A63B 53/0487A63B 53/007A63B 53/0441A63B 53/0408A63B 53/023

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References

Claims

Abstract

A putter-head ( 1 ) giving positive ball-topspin (S) for impact-heights (h i ) above 5 mm from its sole ( 6 ), has its center of mass ( 9 ) located p mm behind its impact face ( 8 ) at height h c mm above the sole ( 6 ), a mass M kgm and a radius of gyration K mm about the heel-toe axis ( 4 - 5 ) through the center of mass ( 9 ). The loft (α) of the impact face ( 8 ) increases monotonically with height from 5 to 15 mm above the sole ( 6 ), where (K 2 /p) is greater than 5 mm and S=S G +S L where S G and S L are percentage spin rates based on: S G =(250× h )/[(3.2+70× M )×( K 2 /p )+ p] S L =(−0.76×α i )/[1+0.04×( p/K) 2 ] for which: h=h i −h c −p ×sin( a i ) and α i degrees is impact-face loft at height h i . From the sole ( 6 ) upwards, the impact face curves ( 16 ) from negative- to positive-loft and merges into an upper flat-portion ( 15 ) of positive loft. Alternatively, it has upper and lower flat-portions ( 21, 22 ) of positive- and negative-loft respectively. A hosel ( 30, 31 ) gives high compliance at impact for head-rotation relative to the shaft ( 33 ) about the heel-toe axis ( 4 - 5 ), and allows choice of lie in shaft-attachment.

Claims

exact text as granted — not AI-modified

1 - 20 . (canceled)  
     
     
         21 . A putter-head for imparting a positive rate (S) of topspin on a golf ball for impacts with the ball throughout a range of impact height (h i ) extending above 5 millimeter from the bottom of the putter-head, wherein the head has a center of mass located at a distance p millimeter behind its impact face and a height h c  millimeter above the bottom of the head, a mass M kilogram and a radius of gyration K millimeter about the heel-toe axis through the center of mass, and the loft (α) of the impact face increases monotonically with height from 5 to 15 millimeter above the bottom of the putter-head, and wherein:  
           K   2   /p&gt; 5   (a)  and    S=S   G   +S   L    (b)  where the spin rates S G  and S L  expressed as percentages, are as follows:        S   G =(250 ×h )/[(3.2+70 ×m )×( K   2   /p )+ p]     S   L =(−0.76×α i )/[1+0.04×( p/K ) 2 ] for which:    h=h   i   −h   c   −p ×sin(α i )    and 
 α i  degrees is the impact-face loft at height h i  millimeter.  
   
     
     
         22 . The putter-head according to  claim 21 , wherein the loft (α 15 ) at 15 millimeter above the bottom of the head is at least 3 degrees larger than the loft (α 5 ) at 5 millimeter above the bottom of the head.  
     
     
         23 . The putter-head according to  claim 22 , wherein α 15  is at least 5 degrees larger than α 5 .  
     
     
         24 . The putter-head according to  claim 23 , wherein α 15  is at least 7 degrees larger than α 5 .  
     
     
         25 . The putter-head according to  claim 21 , wherein S is at least +2.5%.  
     
     
         26 . The putter-head according to  claim 25 , wherein S is at least +5.0%.  
     
     
         27 . The putter-head according to  claim 21 , wherein the head also imparts a positive rate (S) of topspin of at least 5.0% for impacts with the ball throughout a range of impact height (h i ) extending above 2.5 millimeter from the bottom of the putter-head.  
     
     
         28 . The putter-head according to  claim 21 , wherein h c  is less than 10 millimeter.  
     
     
         29 . The putter-head according to  claim 28 , wherein h c  is not more than 7 millimeter.  
     
     
         30 . The putter-head according to  claim 21 , wherein the ratio K 2 /p is more than 5 millimeter.  
     
     
         31 . The putter-head according to  claim 30 , wherein the ratio K 2 /p is not less than 8 millimeter.  
     
     
         32 . The putter-head according to  claim 31 , wherein p is at least 10 millimeter.  
     
     
         33 . The putter-head according to  claim 32 , wherein p is less than 35 millimeter.  
     
     
         34 . The putter-head according to  claim 33 , wherein p is less than 30 millimeter.  
     
     
         35 . The putter-head according to  claim 21 , including shaft-attachment means and wherein a putter-shaft is attached to the head via the shaft-attachment means and the horizontal offset of the axis of the shaft from the heel-toe axis is less than the radius of the shaft at the shaft-attachment means.  
     
     
         36 . The putter-head according to  claim 35 , wherein the shaft-attachment means has zero horizontal offset from the heel-toe axis.  
     
     
         37 . The putter-head according to  claim 35 , wherein the horizontal displacement of the shaft-attachment means from the center of mass is less than the radius of gyration K.  
     
     
         38 . The putter-head according to  claim 21 , wherein the impact face includes an upper, flat portion having positive loft.  
     
     
         39 . The putter-head according to  claim 21 , wherein the impact face includes a lower portion which is curved and has loft that increases from a negative value to a positive value upwardly from the bottom of the head.  
     
     
         40 . The putter-head according to  claim 21 , wherein the impact face includes a lower, flat portion having negative loft.

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