Golf club shaft and set of golf clubs

• US 4,165,874 A
• Filed: 09/14/1977
• Issued: 08/28/1979
• Est. Priority Date: 10/13/1976
• Status: Expired due to Term

• Current Assignee: Wilson Sporting Goods Company (Anta International Group Holdings Ltd.)
• Original Assignee: PepsiCo Incorporated
• Inventors: Piotrowski, Peter J., Lezatte, Arthur J.
• Primary Examiner(s): Apley, Richard J.
• Application Number:
  US05/833,248
• Time in Patent Office: 713 Days
• Field of Search: 273/77 R, 273/77 A, 273/80 R, 273/80 B, 273/167 F, 273/169, 273/DIG. 23
• US Class Current: 473/291
• CPC Class Codes: A63B 53/00 Golf clubs
• CPC Class Codes: A63B 53/005 Club sets
• CPC Class Codes: A63B 53/12 Metallic shafts
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: A63B 60/14 Coverings specially adapted for handles, e.g. sleeves or ribbons
• CPC Class Codes: E21D 9/003 Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
• CPC Class Codes: E21D 9/04 Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for E21D9/005, E21D9/06 take precedence; soil improvement E21D9/001; provisional protective covers E21D19/04

Abstract

An improved golf club shaft and golf club, the shaft being of stepped configuration, having a uniform outer diameter butt end portion having a uniform wall thickness at least 10 inches (254mm) long, the uniform wall thickness being not greater than 0.012 (0.305mm) and a plurality of cylindrical step portions of progressively smaller outer diameter terminating in a tapered tip end portion having a wall thickness at the tip end of at least 0.024 (0.610)mm). The shaft is characterized by a redistribution of metal which results in a balance point closer toward the tip of the shaft, making it possible to use a lighter head without affecting the swing weight.

Claims

1. A metal golf club shaft of stepped configuration having a uniform outer diameter, uniform wall thickness butt end portion at least 10 inches (254 mm) long, said uniform wall thickness being not greater than 0.012 inch (0.305 mm), said butt end portion terminating in a plurality of cylindrical step portions of progressively smaller outer diameter and progressively increasing wall thickness terminating in an intermediate cylindrical step portion of smaller outer diameter, greater wall thickness and of increased longitudinal extent than the cylindrical steps, said intermediate cylindrical step portion terminating in a plurality of cylindrical step portions of progressively smaller outer diameter and a progressively increasing wall thickness and terminating in a tapered tip end portion having a wall thickness at the tip end of at least 0.024 inch (0.610 mm).

2. A golf club shaft according to claim 1 in which the outer diameter of said butt end portion is at least 0.620 inch (15.75 mm).

3. A golf club shaft according to claim 1 in which said butt end portion is at least partly covered with a flexible grip weighing no more than 1-13/32 ounces (40.00 g).

4. A set of golf irons containing at least the series of irons ranging from the No. 2 iron to the No. 9 iron, said irons each including a metal shaft having a butt end portion terminating in a plurality of cylindrical step portions of progressively smaller outer diameter and progressively increasing wall thickness, said cylindrical step portions terminating in a tapered tip portion, the butt end portion of each iron club being of uniform wall thickness and being at least 10 inches (254 mm) long and having an outer diameter of at least 0.620 inch (15.75 mm), a flexible grip covering at least a portion of the butt end portion of each club, said grip weighing no more than 1-13/32 ounces (40.00 g) and a club head of different loft secured to the tip end of each shaft, the club head for the No. 2 iron weighing not more than 8-5/16 ounces (235.7 g) and the club head for the No. 9 iron weighing not more than 97/8 ounces (280 g) for D2 swingweight.

5. A set of golf irons according to claim 4 in which said tapered tip portion has a wall thickness of at least 0.024 inch (0.61 mm).

6. A set of golf irons according to claim 4 in which the butt end portion of each shaft has a wall thickness not exceeding 0.012 inch (0.305 mm).

7. A set of golf irons containing at least a series of irons from the No. 2 iron to the No. 9 iron, said irons each including a metal shaft having a butt end portion terminating in a plurality of cylindrical step portions of progressively smaller outer diameter and progressively increasing wall thickness, said cylindrical step portions terminating in a tapered tip portion, the butt end portion of each shaft being at least 10 inches (254 mm) long and having a uniform wall thickness not exceeding 0.012 inch (0.305 mm), a flexible grip covering at least a portion of the butt end portion of each club, said grip weighing no more than 1-13/32 ounces (40.00 g), said tapered tip on each shaft having a wall thickness of at least 0.024 inch (0.61 mm) and a club head of different loft secured to the tip end of each shaft, the club head for the No. 2 iron weighing not more than 8-5/16 ounces (235.7 g) and the club for the No. 9 iron weighing not more than 97/8 ounces (280 g) for D2 swingweight, each shaft weighing between 33/4 and 4 ounces (106.1 to 113.2 g).