This invention relates generally to golf equipment and, in particular, to a golf putter head with increased perimeter weighting.
Recent developments in golf equipment have resulted in putters with heads that have higher moments of inertia. For example, U.S. Pat. No. 5,482,281 to D. W. Anderson discloses a putter head sold under the name DANSER. The Anderson putter head has heel and toe weights mounted on a lower plate-like member. The heel and toe weights and the lower plate-like member are preferably made of dense material such as bronze or steel. An upper shell-like member, preferably made of lower density material such as plastic or aluminum, is secured to the lower plate-like material to enclose the heel and toe masses. U.S. Pat. No. 5,842,935 to M. J. Nelson discloses a putter head sold under the name NELLI. The Nelson putter head has a horseshoe shaped body formed of high density material such as steel with thickened heel and toe portions. The horseshoe shaped body includes a cavity which receives an insert formed of low density material such as polyurethane. The insert preferably constitutes about 15 percent of the total mass of the putter head while constituting more than 50 percent of the total volume of the putter head. Further, U.S. Pat. No. 6,960,140 to J. A. Solheim et al discloses a putter head sold under the name CRAZE. The Solheim putter head includes a central member connected to a face member. The central member has a thickened portion located rearward of the face member, and a pair of arms extend rearward from heel and toe ends of the face member.
The present invention provides a golf putter head including a face member arranged for impacting a golf ball, the face member having a heel end and a toe end. A first rear mass is located substantially rearward of the heel end, and a second rear mass is located substantially rearward of the toe end. Upper and lower arms extend rearwardly from the face member connecting the face member to the first rear mass and to the second rear mass. A cavity is defined between the upper and lower arms, and the putter head further includes an opening to the cavity located between the first and second rear masses. In the preferred embodiment, the putter head has two additional openings to the cavity. One of these additional openings is located between the first rear mass and the face member, and the other additional opening is located between second rear mass and the face member. The upper and lower arms are each generally T-shaped or Y-shaped. The upper and lower arms each have a first portion extending between the first and second rear masses, and a second portion extending between the first portion and the face member.
Openings 27, 28, and 29 to the cavity 30 are provided between the upper and lower arms 25. Each opening 27, 28, 29 has a greater horizontal dimension than vertical dimension. Openings 27 and 28 are mirror images of each other. Opening 27 is located between the first rear mass 21 and the face member 14. Opening 28 is located between the second rear mass 22 and the face member 14. Opening 29 is located between the first and second rear masses 21, 22.
A hosel 16 is connected to the face member 14 for attachment to a shaft (not shown). Alternatively, a hole may be formed in face member 14 for receiving the shaft. Hosel 16 may be positioned relative to face member 14 so that the putter head 10 is “face-balanced” as described in U.S. Pat. No. 5,226,654 to K. Solheim.
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In the preferred embodiment, rear masses 21 and 22 are made of the same material as the remainder of body 15. In other embodiments, rear masses 21 and 22 may be made of or include a different material with higher density to further increase the moment of inertial of the putter head 10. For example, rear masses 21 and 22 may be made of metal while the remainder of the body 15 is made of a non-metallic material.
It will be understood that since the masses 21 and 22 are located directly behind the heel and toe ends 11, 12 of the face member 14, they provide the putter head 10 with increased perimeter weighting and an increased moment of inertia.
In an alternative embodiment (not shown), another material may completely or partially fill cavity 30. Such another material will preferably have lower density than the material forming body 15.
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