Club head for a golfing putter

Abstract

A golf club head ( 21 ) for a putter, in which the club head ( 21 ) is provided with a toe wing ( 31 ) projecting from a toe portion ( 23 ), and a heel wing ( 31 ″) projecting from a heel portion ( 25 ), each of the wings ( 31, 31 ″) being provided with an outward side surface ( 37 ) diverging in a direction away from a striking face ( 27 ), the toe wing ( 31 ) and the heel wing ( 31 ′) being connected to one or more bracing means ( 65, 71, 71′, 73 ).

1 . A golf cub head ( 21 ) for a putter club, in which the club head ( 21 ) is provided with a toe wing ( 31 ) projecting from a toe portion ( 23 ), and a heel wing ( 31 ′) projecting from a heel portion ( 25 ), the wings ( 31 ,  31 ′) being each provided with an outward side surface ( 37 ), the side surfaces ( 37 ) diverging relative to each other in a direction away from a striking face ( 27 ), characterized in that 
 a substantial portion of the moment of inertia of the toe wing ( 31 ) and the heel wing ( 31 ′) around a vertical axis coinciding with the clubs head centre of mass, is obtained by the mass of the rear end portion ( 45 ) of the wing ( 31 ,  31 ′), 
 the mass per length unit of the end portion of each wing ( 31 ,  31 ′) being substantially larger than the mass per length unit of adjacent mid portions of the wings ( 31 ,  31 ′);  
   and that at least one bracing means ( 65 ,  71 ,  71 ′) is secured to the rear end portion ( 45 ) of either wing ( 31 ,  31 ′)    
   
   
       2 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that to a mid portion ( 29 ′,  75 ) of the golf club head ( 21 ) there is secured at least one bracing means ( 65 ,  73 ).  
   
   
       3 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the golf club head ( 21 ) includes an intermediate plate ( 65 ) filling the space between the lower portions ( 35 ) of the wings ( 31 ,  31 ′).  
   
   
       4 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that cross stays ( 71 ,  71 ′) connect the rear end portions ( 45 ) of the wings ( 31 ,  31 ′).  
   
   
       5 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that cross stays ( 71 ,  71 ′), connecting the rear end portions ( 45 ) of the wings ( 31 ,  31 ′), are rigidly connected by a stabilizing stay ( 73 ) to the mid portion ( 75 ) of the golf club head ( 21 ).  
   
   
       6 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that each of the wings ( 31 ,  31 ′) has an inward-facing, rectilinear side edge portion ( 39 ) lying essentially parallel to each other and being, in a horizontal plane, essentially at right angles to the striking face ( 27 ).  
   
   
       7 . A golf club head ( 21 ) in accordance with  claim 5 , characterized in that the rectilinear side edge portion ( 39 ) has an extent of at least 10 mm.  
   
   
       8 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the mass centre of the club head ( 21 ) is positioned lower than the centre of the striking face ( 27 ).  
   
   
       9 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the toe portion ( 23 ) and the heel portion ( 25 ) have an L-shaped cross-section, a lower portion ( 55 ) thereof projecting essentially horizontally in a direction away from the striking face ( 27 ).  
   
   
       10 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that a middle portion of each of the wings ( 31 ,  31 ′) has an L-shaped cross-section, a bottom portion ( 35 ) thereof projecting essentially horizontally in a direction away from the outer side surface ( 37 ).  
   
   
       11 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the rear portions ( 45 ) of the club head ( 21 ) are formed essentially by a material of a specific gravity of more than 3.5 kg/dm 3  and the front portions ( 23 ,  25 ,  27 ) of the club head ( 21 ) are formed essentially by a material of a specific gravity of less than 3.5 kg/dm 3 .  
   
   
       12 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the lower portions ( 29 ′,  35 ,  55 ) of the club head ( 21 ) are formed essentially by a material having a specific gravity of more than 3.5 kg/dm 3  and the upper portions ( 29 ,  47 ) of the club head ( 21 ) are formed essentially by a material of a specific gravity of less than 3.5 kg/dm 3 .  
   
   
       13 . A golf club head ( 21 ) in accordance with  claim 1 , characterized in that the rear and outer portions ( 45 ) of the club head ( 21 ) are formed essentially by a material of a specific gravity larger than 3.5 kg/dm 3  and the middle portions ( 29 ,  29 ′,  75 ) of the club head ( 21 ) are formed essentially by a material of a specific gravity of less than 3.5 kg/dm 3 .