Balanced set of iron type golf clubs

Abstract

A a method of making set of a plurality of at least a combination of three golf clubs of progressive lofts that are matched to provide identical swing characteristics; each of the golf clubs including a club head, a shaft and a grip at the upper end of said shaft; each club of the combination characterized by having an essentially identically located, computer designed center of gravity; each club being further defined by the shaft having an equal length, having an identical swing weight, identical grip weight and an identical club head weight.

1 . A method of making a set of matched golf clubs in combinations of at least three matched golf clubs; each club having a club head, a shaft and grip to provide identical swing characteristics; said club head having a means for connection to a shaft, a frontal ball striking face, a top surface, bottom surface, heel, toe and rear surface defining a rear weight and cavity formed therein, comprising the steps of:
 a. locating the center of gravity of each of the club heads of a given combination of club heads of the set in the same relative position in three axes in each club head defined by the intersection of the horizontal X-axis, the vertical Y-axis and the posterior Z-axis;   b. matching the weight of each of said club heads whereby the weight of each club head is the same;   c. matching the length of the shaft of each club whereby the length of each shaft is the same;   d. and, attaching said shaft with a grip to said club head whereby each club has an identical length, identical weight, identical swing weight and identical center of gravity location.   
     
     
         2 . The method of  claim 1  wherein the location of said center of gravity and said club head weight are adjusted by precisely adjusting the weight and size of said club head. 
     
     
         3 . The method of  claim 2  further defined by adjusting the X-axis, and the Y-axis of the location of said center of gravity in sequential steps. 
     
     
         4 . The method of  claim 3  further including the step of adjustably positioning the X-axis of said center of gravity in a heel to toe direction by angularly varying the thickness of said rear weight of said club head in a heel to toe direction such that an increase of the angle of thickness locates the X-axis closer toward said toe and a decrease of the angle of thickness locates the X-axis closer toward said heel of said club head. 
     
     
         5 . The method of  claim 4  further including the step of adjustably positioning the Y-axis of said center of gravity in a top to bottom direction by adjusting the height of said rear weight between said top surface and said bottom surface such that an increase in height of said rear weight locates the Y-axis closer toward said top surface and a decrease in height of said rear weight locates the Y-axis closer toward said bottom of said club head. 
     
     
         6 . The method of  claim 5  wherein the location of the Z-axis of said center of gravity is a result of the position of the X-axis and Y-axis. 
     
     
         7 . The method of  claim 2  wherein the weight of the club head is adjusted by varying the size of the cavity of each club in a combination. 
     
     
         8 . The method of  claim 7  wherein the step of adjusting the weigh is further defined by increasing the size of the cavity to decrease the club head weight and decreasing the size of the cavity to increase the club head weight. 
     
     
         9 . The method of  claim 8  wherein the step of adjusting the weigh is further defined by altering the height of the toe and or the height of the heel of each club in a combination; whereby increasing the height of the heel and or toe increases the club head weight and decreasing the height of the toe or heel decreases the club head weight. 
     
     
         10 . The method of  claim 6  further including a step of repeating the steps of  claim 6  until optimum values of the parameters of the club head are found. 
     
     
         11 . A method of making a set of matched golf clubs in combinations of at least three matched golf clubs; each club having a club head, a shaft and grip to provide identical swing characteristics; said club head having a means for connection to a shaft, a frontal ball striking face, a top surface, bottom surface, heel, toe and rear surface defining a rear weight and cavity formed therein, comprising the steps of:
 a. locating the center of gravity of each of the club heads of a given combination of club heads of the set in the same relative position to and equidistant from the frontal ball striking face in three axes in each club head, the axes defined by the intersection of the horizontal X-axis, the vertical Y-axis and the posterior Z-axis,   b. matching the weight of each of said club heads whereby the weight of each club head is the same;   c. matching the length of the shaft of each club in the combination whereby the length of each club is the same;   d. and, attaching said shaft to said club head whereby each club has an identical length, identical weight, identical swing weight and identical center of gravity location.   
     
     
         12 . The method of  claim 11  wherein the location of said center of gravity and said club head weight are adjusted by precisely adjusting the weight and size of the club head. 
     
     
         13 . The method of  claim 12  further defined by adjusting the X-axis, and the Y-axis of the location of said center of gravity in sequential steps. 
     
     
         14 . The method of  claim 13  further including the step of adjustably positioning the X-axis of said center of gravity in a heel to toe direction by angularly varying the thickness of said rear weight of said club head in a heel to toe direction such that an increase of the angle of thickness locates the X-axis closer toward said toe and a decrease of the angle of thickness locates the X-axis closer toward said heel of said club head. 
     
     
         15 . The method of  claim 14  further including the step of adjustably positioning the Y-axis of said center of gravity in a top to bottom direction by adjusting the height of said rear weight between said top surface and said bottom surface such that an increase in height of said rear weight locates the Y-axis closer toward said top surface and a decrease in height of said rear weight locates the Y-axis closer toward said bottom of said club head. 
     
     
         16 . The method of  claim 15  wherein the location of the Z-axis of said center of gravity is a result of the position of the X-axis and Y-axis. 
     
     
         17 . The method of  claim 12  wherein the weight of the club head is adjusted by varying the size of the cavity of each club in a combination. 
     
     
         18 . The method of  claim 17  wherein the step of adjusting the weigh is further defined by increasing the size of the cavity decreases the club head weight and decreasing the size of the cavity increases the club head weight. 
     
     
         19 . The method of  claim 18  wherein the step of adjusting the weigh is further defined by altering the height of the toe and or the height of the heel of each club in a combination; whereby increasing the height of the heel and or toe increases the club head weight and decreasing the height of the toe or heel decreases the club head weight. 
     
     
         20 . The method of  claim 16  further including a step of repeating the steps of  claim 16  until optimum values of the parameters of the club head are found. 
     
     
         21 . A method of making a set of matched golf clubs in combinations of at least three matched golf clubs; each club having a club head, a shaft and grip to provide identical swing characteristics; said club head having a means for connection to a shaft, a frontal ball striking face, a top surface, bottom surface, heel, toe and rear surface defining a rear weight and cavity formed therein, comprising the steps of:
 a. locating the center of gravity of each of the club heads of a given combination of club heads of the set using a computer aided design program in the same relative position to and equidistant from the frontal ball striking face in three axes in each club head, the axes defined by the intersection of the horizontal X-axis, the vertical Y-axis and the posterior Z-axis,   b. matching the weight of each of said club heads whereby the weight of each club head is the same;   c. matching the length of the shaft of each club in the combination whereby the length of each club is the same;   d. and, attaching said shaft with a grip to said club head whereby each club has an identical length, identical weight, identical swing weight and identical center of gravity location.   
     
     
         22 . The method of  claim 21  wherein the location of said center of gravity and said club head weight are adjusted by precisely adjusting the weight of said club head in accordance with parameters determined by said computer aided design. 
     
     
         23 . The method of  claim 22  further defined by adjusting the X-axis, and the Y-axis of the location of said center of gravity in sequential steps. 
     
     
         24 . The method of  claim 23  further including the step of adjustably positioning the X-axis of said center of gravity in a heel to toe direction by angularly varying the thickness of said rear weight of said club head in a heel to toe direction such that an increase of the angle of thickness locates the X-axis closer toward said toe and a decrease of the angle of thickness locates the X-axis closer toward said heel of said club head. 
     
     
         25 . The method of  claim 24  further including the step of adjustably positioning the Y-axis of said center of gravity in a top to bottom direction by adjusting the height of said rear weight between said top surface and said bottom surface such that an increase in height of said rear weight locates the Y-axis closer toward said top surface and a decrease in height of said rear weight locates the Y-axis closer toward said bottom of said club head. 
     
     
         26 . The method of  claim 25  wherein the location of the Z-axis of said center of gravity is a result of the position of the X-axis and Y-axis. 
     
     
         27 . The method of  claim 21  wherein the weight of the club head is adjusted by varying the size of the cavity of each club in a combination. 
     
     
         28 . The method of  claim 27  wherein the step of adjusting the weight is further defined by increasing the size of the cavity to decrease the club head weight and decreasing the size of the cavity to increase the club head weight. 
     
     
         29 . The method of  claim 28  wherein the step of adjusting the weigh is further defined by altering the height of the toe and or the height of the heel of each club in a combination; whereby increasing the height of the heel and or toe increases the club head weight and decreasing the height of the toe or heel decreases the club head weight. 
     
     
         30 . The method of  claim 26  further including a step of repeating the steps of  claim 26  until optimum values of the parameters of the club head are found. 
     
     
         31 . The method of  claim 21  wherein the step of using a computer aided design includes determining the shape, weight, size and the X, Y, and Z axes of the club head. 
     
     
         32 . The method of  claim 21  further including the steps of entering the height of the toe and the height of the heel into the computer aided design program; calculating the weight of the club head based of the heel and toe height parameters; entering the back angle of the club head formed by the rear surface of the club head between the heel and toe into the computer aided design program; determining a starting X-axis using the parameters of the back angle; entering the back height of the club head into the computer aided design program; determining the Y-axis from the back height parameters; entering the size of the back cavity into the computer aided design program; and, determining the final weight of the club head from the computer aided design program. 
     
     
         33 . The method of  claim 26  further including a step of repeating the steps of  claim 26  until optimum values of the parameters of the club head are found.