Putter with bi-material shaft

Abstract

A process for manufacturing a putter with a bi-material shaft is disclosed herein. The putter comprises a putter head, the bi-material shaft, a mass member and a grip. The bi-material shaft comprises a body with a tip end and a butt end. The body comprises a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point. The mass member is positioned within an opening at the butt end of the shaft. Mass from the shaft is transferred to the club head and the mass member in the butt end of the shaft.

Claims

1. A shaft comprising: a body with a tip end and a butt end, the body comprising a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point, wherein the metal section is composed of a metal selected from the group consisting of steel, titanium, aluminum, titanium alloy, and aluminum alloy; and a mass member positioned within an opening at the butt end of the shaft; wherein the composite section is from 60 to 80 percent of the length of the shaft and the composite section is less than 50 percent of the mass of the shaft.

2. The shaft according to claim 1 wherein the mass member has a mass ranging from 20 grams to 40 grams.

3. The shaft according to claim 1 wherein the mass member has a mass of 30 grams.

4. A golf club comprising: a club head; and a shaft comprising: a body with a tip end and a butt end, the body comprising a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point, wherein the metal section is composed of a metal selected from the group consisting of steel, titanium, aluminum, titanium alloy, and aluminum alloy, and a mass member positioned within an opening at the butt end of the shaft; wherein mass of the golf club is focused in the club head and the mass member in the butt end of the shaft; wherein the composite section is from 60 to 80 percent of the length of the shaft and the composite section is less than 25 percent of the mass of the shaft.

5. The golf club according to claim 4 wherein the mass member has a mass ranging from 20 grams to 40 grams.

6. The golf club according to claim 4 wherein the mass member has a mass of 30 grams.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 is an illustration of a putter and a comparison of a prior art putter and a putter of the present invention.

(2) FIG. 2 is an illustration of a putter.

(3) FIG. 3 is an illustration of a putter.

(4) FIG. 4 is an image of a bi-material shaft.

(5) FIG. 5 is an image of an intersection of a bi-material shaft.

(6) FIG. 6 is an image of a butt end of a bi-material shaft.

(7) FIG. 7 is an exploded view image of a butt end of bi-material shaft with a mass member.

(8) FIG. 8 is an exploded view image of a bi-material shaft with a mass member.

(9) FIG. 9 is an image of a putter with a bi-material shaft.

(10) FIG. 10 is an image of a putter with a bi-material shaft.

(11) FIG. 11 is an image of a putter with a bi-material shaft.

(12) FIG. 12 is an image of a putter with a bi-material shaft.

DETAILED DESCRIPTION OF THE INVENTION

(13) FIGS. 1-3 is a comparison of a putter with a standard shaft and a putter with a bi-material shaft. As shown in FIG. 4-12, a bi-material shaft 50 for a putter 20 allows for mass optimization to increase a moment of inertia of the putter 20. FIGS. 4 and 5 illustrate an embodiment with a metal section 54 at the butt end 53 and a composite section 56 at a tip end 52 of a body 51 of a shaft 50. FIGS. 5-12 illustrate an embodiment with a metal section 54 at the tip end 52 and a composite section 56 at the butt end 53 of a body 51 of a shaft 50.

(14) The putter 20 comprises a putter-head 30, a mass member 40, a shaft 50 and a grip 60. The putter-head 30 comprises a hosel 32. The shaft 50 comprises a body 51 with a tip end 52 and a butt end 53. The body 51 comprises a metal section 54 extending from the tip end 52 to a connection point 55, and a composite section 56 extending from the butt end 53 to the connection point 55. The mass member 40 is positioned within an opening 57 at the butt end 53 of the shaft 50. Mass that otherwise would be present in the shaft 50 is transferred to the putter-head 30 and the mass member 40 in the butt end 51 of the shaft 50.

(15) The metal section 54 of the bi-material shaft 50 is manufactured from metal such as steel, titanium, aluminum, or alloys thereof. A preferred metal is 4140m alloy steel available from manufacturers such as Worthington Steel of Pennsylvania.

(16) An outer diameter of the butt end 53 of the shaft 50 ranges generally from about 0.550 to about 0.625 inch, desirably from about 0.560 to about 0.615 inch, and preferably from about 0.600 to about 0.610 inch. Alternatively, the butt end 53 is tapered, and has a reduction in outer diameter of less than about 0.010 inch per linear inch of the butt section, along the longitudinal axis of the shaft. The length of the butt section generally ranges from about 4 to about 16 inches, and preferably from about 8 to about 14 inches depending on the shaft stiffness desired.

(17) The outer diameter of a tapered tip end 51 decreases from a location where it connects to the tapered end to a distal end thereof which reduces the outer diameter of the tip end in a range generally from about 0.001 to about 0.020 inch per linear inch of the tip end, desirably from about 0.0050 to about 0.0100 inch per linear inch of the tip section, and preferably is about 0.0075 inch per linear inch of the tip section.

(18) The mass member 40 preferably has a mass ranging from 20 grams to 40 grams, and most preferably 30 grams.

(19) The composite section is preferably from 60 to 80 percent of the length of the shaft and the composite section is preferably less than 50 percent of the mass of the shaft, and most preferably less than 25 percent of the mass of the shaft.

(20) The grip 60 preferably has a mass ranging from 40 grams to 65 grams.

(21) The putter-head 30 preferably has a mass ranging from 300 to 400 grams.

(22) U.S. Pat. No. 9,808,679 for a Golf Club Shaft Connection Assembly is hereby incorporated by reference in its entirety.

(23) U.S. Pat. No. 9,694,262 for a Putter With Adjustable Hosel is hereby incorporated by reference in its entirety.

(24) U.S. Pat. No. 9,216,334 for a Variable Length Golf Club Shaft is hereby incorporated by reference in its entirety.

(25) U.S. Pat. No. 9,155,947 for an Adjustable Golf Club Shaft And Hosel Assembly is hereby incorporated by reference in its entirety.

(26) U.S. Pat. No. 9,017,507 for a Method And System For Manufacturing A Composite Shaft is hereby incorporated by reference in its entirety.

(27) U.S. Pat. No. 6,692,377 for a Graphite Shaft With Foil Modified Torsion is hereby incorporated by reference in its entirety.

(28) U.S. Pat. No. 6,413,232 for a Method For Manufacturing Hybrid Golf Club Shafts is hereby incorporated by reference in its entirety.

(29) U.S. Pat. No. 4,591,157 for a Golf Club Shaft is hereby incorporated by reference in its entirety.

(30) From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.