Golf club

• US 4,523,759 A
• Filed: 05/11/1983
• Issued: 06/18/1985
• Est. Priority Date: 05/11/1983
• Status: Expired due to Fees

• Current Assignee: Lawrence Y. Igarashi
• Original Assignee: Lawrence Y. Igarashi
• Inventors: Igarashi, Lawrence Y.
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US06/493,732
• Time in Patent Office: 769 Days
• Field of Search: 273/167 H, 273/169, 273/171, 273/77 A, 273/186 R
• US Class Current: 473/346
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0441 with visual indicators for aligning the golf club
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/42 Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
• CPC Class Codes: A63B 60/46 Measurement devices associated with golf clubs, bats, rackets or the like for measuring physical parameters relating to sporting activity, e.g. baseball bats with impact indicators or bracelets for measuring the golf swing

Abstract

A perimeter weighted hollow golfing iron having a foam core with an effective hitting area concentrated toward the center of moments is disclosed. The weight of the club is concentrated at the perimeter to provide for the center of moments and proximate effective hitting area over the core. The club is formed from an investment casting having a cavity and is made from a method whereby the club is originally cast with a tapered core which is later withdrawn. Thereafter, an end plate is implaced over the cavity and welded thereto with an opening for insertion of the foam with an epoxy plug filling the opening of the plate. An effective hitting area is established by means of a club holder having a transducer so that impacts through an impact device against the club face can be sensed by the transducer to provide signals to an output such as a CRT, digital or analog readout or oscilloscope.

Claims

1. A metal iron type golf club designed for minimizing offsets from the center of moments and torque when the club strikes a ball comprising:

a golf club having a heel and toe wherein the heel has a hosel extending therefrom adapted to receive a shaft therein;

a cavity within said club surrounded by at least a portion of the metal weight of said club established within a perimeter region outside of said cavity and wherein said perimeter region and said cavity extend from said toe toward said heel in a diminishing manner as to its overall cross sectional size and said cavity is closed from communication with said hosel;

means for closing said cavity formed as a plate welded to said club and overlying said cavity formed with an opening therethrough passing into said cavity;

means in said cavity for displacing a portion of said cavity and formed of a mass of plastic foam larger in size than the opening in said plate and having properties which enable said foam to be implaced through the opening of said plate; and

,

means in said opening in said plate for sealing said foam within said cavity.

2. The golf club as claimed in claim 1 wherein:

said foam is a urethane foam.

3. The golf club as claimed in claim 1 wherein:

said club cavity has indented seating means for receiving the welded closure thereagainst.

4. The golf club as claimed in claim 1 wherein:

said center of moments on the face of said club is established in an area overlying said cavity and is appropriately marked to provide an effective hitting area to avoid torque from offsetting said club when said club strikes a ball.

5. The golf club as claimed in claim 4 wherein:

said center of moments is established in a manner so that there is a substantially greater amount of weight toward the base of said club below said cavity so as to move the center of moments downwardly with respect to the face of said club while still being retained in overlying relationship to said cavity.