Abstract A set of golf club irons with heads having graduated loft angles, the striking faces being of the same size and elliptical shape so that the club head is balanced both vertically and horizontally about the center of the elliptical driving face, with a downwardly curved lower front edge to minimize the divot, and a recess in the rear face creates a sweet spot at the center of the striking face and a uniform distance from the lower front edge throughout the set of irons, the minimum thickness of metal at the sweet spot being also uniform throughout the set of irons since the recess is a spherical segment, above the sole of the head, having a constant radius with a center on a line through the center of the driving face and normal to the plane of the driving face. The psychological advantage in locating the sweet spot identically in identical driving faces is obvious since the user can more easily learn to use all the clubs of the set with heightened efficiency.
A set of golf irons, comprising: a plurality of irons, each iron having a head with a different loft angle wherein said loft angle progressively increases from the lowest numbered iron to the highest numbered iron and each head having a front striking face, a rear face and a lower front leading edge; the striking faces of the different irons being the same size and shape; and the rear face of each iron in said set having therein a recess in the shape of a spherical segment providing a Minimum head thickness uniform throughout said set and a sweet spot at a uniform distance from the lower front edge throughout the set.
Claim 2
Dependent Claim
112 words
A set of golf irons, comprising: a plurality of irons, each iron having a head with a different loft angle wherein said loft angle progressively increases from the lowest numbered iron to the highest numbered iron and each head having a front striking face, a rear face and a lower front leading edge; the striking faces of the different irons being the same size and shape; and the rear face of each iron in said set having therein a recess in the shape of a spherical segment providing a Minimum head thickness uniform throughout said set and a sweet spot at a uniform distance from the lower front edge throughout the set.
Claim 3
Dependent Claim
59 words
A set of golf irons according to claim 1 wherein said striking faces are elliptical so that each lower front edge is downwardly curved to minimize the divot taken by the club in use with the sweet spot at the center of the ellipse so that the striking face is symmetrical both vertically and horizontally about said sweet spot.
Claim 4
Dependent Claim
24 words
A set of golf irons according to claim 1 wherein said distance from the lower front edge is on the order of 1.12 inches.
Claim 5
Dependent Claim
63 words
A set of golf irons according to claim 1 wherein each of said heads has a sole and said recess is above said sole and each sphere of which said recess is a segment has a radius constant thoughout the set, the center of which sphere is on a line perpendicular to said striking face through the sweet spot of said striking face.
Claim 6
Dependent Claim
34 words
A set of golf irons according to claim 4 wherein said radius is on the order of 1.00 inch and the head thickness at said sweet spot is on the order of 0.18 inches.
Claim 7
Dependent Claim
61 words
A set of golf irons according to claim 1 wherein each iron has a sole, the rearward portion of said sole beneath said recess is, in the irons of the set having high loft angles, a plate on the order of 0.125 inch thick curved in conformity with the corresponding portion of the elliptical lower front edge of the striking face.