Golf club with neckless metal head

• US 5,042,806 A
• Filed: 12/29/1989
• Issued: 08/27/1991
• Est. Priority Date: 12/29/1989
• Status: Expired due to Term

• Current Assignee: Callaway Golf Company
• Original Assignee: Callaway Golf Company
• Inventors: Helmstetter, Richard C.
• Primary Examiner(s): Coven, Edward M.
• Assistant Examiner(s): Passaniti, Sebastiano
• Application Number:
  US07/458,962
• Time in Patent Office: 606 Days
• Field of Search: 273/167-175, 273/80.2-80.9, 273/77 A, 29/428, 29/525
• US Class Current: 473/311
• CPC Class Codes: A63B 53/02 Joint structures between the head and the shaft
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

A golf club, of the "metal wood" type, includes a shaft attached to a head that is formed from a foam-filled metal shell. The shell has a heel portion that includes a substantially continuous hollow internal tube extending from the top surface of the shell to the bottom surface that forms the sole of the club head. The shaft extends through the entire length of the tube, with the end of the shaft lying flush with the sole, thereby eliminating the need for a hosel to connect the shaft to the head. The elimination of the hosel allows substantially all of the mass of the club head to be "effective mass", which contributes to the transfer of energy from the player to the ball, for greater shot distance. The extension of the shaft to the sole provides dramatically increased "head feel" for greater shot control. The hosel-less structure is advantageously combined with a sole that has upwardly-angled flats at the toe end, the heel end, and the trailing edge, with a rounded rail from the trailing edge flat to the face of the club. This sole structure provides improved short control, especially from bad lies.

Claims

1. In a golf club, of the type including a head and a shaft with a first end, a portion of the shaft proximate said first end, being attached to a head, the head comprising a hollow metal shell having a ball striking front wall having a striking surface, a top wall, a bottom wall, a toe portion, and a heel portion furthest from said toe portion, said top wall being continuous from said toe portion to said heel portion and not extending above an uppermost level established by the top wall centrally of and above an uppermost extent of the ball striking front wall, the improvement comprising:

(a) a substantially continuous hollow metallic tube extending within said metal shell at the heel portion from the shell top wall to the shell bottom wall, said tube being integral with and terminating at said metal shell top wall, and having a bore, said heel portion including a heel wall merged with a rearwardmost extent of said tube,

(b) the tube bore receiving a portion of the first end of the shaft throughout the length of the tube, the first end of the shaft being configured to lie substantially proximate the bottom surface of the shell bottom wall,

(c) there being means mechanically and adhesively connecting the shaft periphery to the tube bore, and the tube bore having an upper end terminating proximate the level of said uppermost extent of said ball striking front wall,

(d) and the tube having an uppermost rearward end defining an uppermost extent of said heel wall, proximate said level of the uppermost extent of said ball striking front wall.

2. The golf club of claim 1, wherein the striking surface is on a first shell portion that is substantially thicker than the other portions of the shell.

3. The golf club of claim 2, wherein the first shell portion is approximately four times thicker than the other shell portions.

4. The golf club of claim 1, wherein the tube has a side wall with an orifice communicating with the interior of the shell.

5. The golf club of claim 4, wherein the side wall of the tube has an interior surface that is provided with striation means for improving the adhesive bonding between the shaft and the tube.

6. The golf club of claim 5, wherein the striation means are formed as internal threads.

7. The golf club of claim 1, wherein the shell includes a main portion and a sole plate attached to the main portion, wherein the main portion forms the top wall, a rear surface, and the striking surface, and includes the heel portion and the toe portion, and wherein the sole plate forms the bottom wall.

8. The golf club of claim 7, wherein the sole plate comprises:

a trailing edge adjoining the rear surface of the main shell portion; and

a first flattened portion extending upwardly to the trailing edge from a point approximately mid-way between the center of the sole plate and the trailing edge.

9. The golf club of claim 8, wherein the striking surface has a bottom edge adjoining the sole plate, and wherein the sole plate further comprises:

a rounded rail extending from the lowermost part of the first flattened portion to the bottom edge of the striking surface.

10. The golf club of claim 9, wherein the sole plate further comprises:

a second flattened portion extending upwardly from a first side of the rail to a toe end of the head defined by the toe portion; and

a third flattened portion extending upwardly from a second side of the rail to a heel end of the head defined by the heel portion.

11. A method of attaching a foam-filled metal golf club head to a shaft, comprising the steps of:

(a) providing a foam-filled metal golf club head with a top surface, a bottom surface, a ball striking surface having an uppermost extent, a rear surface, a heel end, a toe end, and a substantially continuous hollow tube from the top surface through the bottom surface near the heel end, said tube being formed to have an upper end terminating proximate the level of said uppermost extent of said striking surface, said tube also being formed to have an uppermost rearward end defining an uppermost extent of said heel end proximate the level of said uppermost extent of said striking surface;

(b) attaching a locator ring to the shaft a predetermined distance from a first end of the shaft,

(c) inserting the first end of the shaft into the tube with an adhesive material applied between the exterior surface of the shaft and the interior wall of the tube, the shaft being inserted so that the locator ring abuts against the top surface of the club head, and so that the first end of the shaft extends through the bottom surface, and

(d) trimming the first end of the shaft so that it is substantially flush with the bottom surface.

12. The method of claim 11, wherein the step of providing the club head is followed by the step of internally threading at least a portion of the tube.

13. The method of claim 11, wherein the predetermined distance at which the locator ring is attached is approximately equal to the length of the tube.

14. In a golf club, of the type including a head and a shaft with a first end, a portion of the shaft proximate said first end being attached to a head, the head comprising a hollow metal shell having a ball striking front wall having a striking surface, a top portion, a bottom portion, a toe portion, and a heel wall furthest from said toe portion, said top portion being continuous from said toe portion to said heel portion and not extending above an uppermost level established by the top portion centrally of and above an uppermost extent of the ball striking front wall the improvement comprising:

(a) a substantially continuous hollow metallic tube extending lengthwise along a shell wall from the shell top portion to the shell bottom portion, said tube being integral with and terminating at said metal shell top portion and having a bore,

(b) the tube bore receiving the shaft throughout the length of the tube, the first end of the shaft being configured to lie substantially proximate the bottom surface of the shell bottom portion,

(c) there being means mechanically and adhesively connecting the shaft periphery to the tube bore, and the tube bore having an upper end terminating proximate the level of said uppermost extent of said ball striking front wall,

(d) and the tube having a lengthwise extending wall integrated along its length with said shell wall so that the shell supports the tube along its length, and whereby metal otherwise required for the tube is used in the shell at locations between the tube and said toe portion.