Golf club with polyurethane insert

• US 3,937,474 A
• Filed: 02/25/1974
• Issued: 02/10/1976
• Est. Priority Date: 03/10/1971
• Status: Expired due to Term

• Current Assignee: Acushnet Company (FILA Holdings Corp.)
• Original Assignee: Acushnet Company (FILA Holdings Corp.)
• Inventors: Jepson, John W., Allen, Earle F. Jr.
• Primary Examiner(s): Apley, Richard J.
• Application Number:
  US05/445,462
• Time in Patent Office: 715 Days
• Field of Search: 273/78, 273/167-175, 273/218, 273/235, 273/DIG. 8, 260/22, 260/75, 260/77.5
• US Class Current: 473/342
• CPC Class Codes: A63B 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/042 the face insert consisting of a material different from that of the head
• 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
• CPC Class Codes: Y10S 273/08 Urethane

Abstract

Golf clubs are provided with polyurethane inserts on the striking face. These golf clubs have been found to have advantage over standard golf clubs in that a golf ball hit with these clubs travels a greater distance, all other conditions being equal.

Claims

1. In a golf club comprising a shaft and a club head, the improvement which comprises a polyurethane striking plate of about 1/4 inch thickness and a hardness of from about 40 to about 75 on the Shore Durometer D Scale according to ASTM Standard D 2240 affixed to the striking face of the club head, said polyurethane being a cured reaction product of components consisting essentially of a prepolymer consisting essentially of a polytetramethylene ether glycol combined with toluene diisocyanate and having about 9.5% free isocyanate, and a curing agent for the prepolymer selected from the group consisting of tetrafunctional polyols and 4,4'"'"'-methylene-bis-2-chloroaniline, and wherein the prepolymer and the curing agent are in an equivalent weight ratio of about 1:

1 for the tetrafunctional polyols and about 1.2;

1 for the 4,4'"'"'-methylene-bis-2-chloroaniline.