US1901562A - Golf club - Google Patents

Description

N. S. MAIN GOLF CLUB March 14, 1933.

Filed Dec. 2", 1928 FIG. I.

Patented Mar. 14, 1933 UNITED STATES NORMAN s'rnwnm' MAIN, or nmmrneowsoornnnn GOLF CLUB,

Application filed December 2c, 1928, Serial No. meant-a Great Britain December 30,1927.

This invention relates to the heads of golf clubs. I have found that if'a ball is centre of the club face and swerves while travellingthrough the air, while a ball hit off the heel of the club head-diverges to the other side, and that this efiect is due to the twisting of the club head on impact.

In my invention I minimize or eliminate this divergence by the combination of two features of construction eachof which by itself has been previously adopted in a golf club, viz

(l) by constructing the club head of a light material and forming it with a heavier heel and toe with the object of giving it the maximum moment of inertia about its vertical axis of rotation under impact, that is, about a vertical axis which passes through or close to the centre of gravity of the club head, and (2) by making the striking face slightly cylindrical, the curvature being approximately a small segment of a large cylinder 5 with a vertical axis.

produced by the separation of the added,

The heel and toe of the club head may be loaded by the known method of inserting weights away from the central portion of the striking face. As much effect as possible is weights and the curvature of the face is kept as slight as possible. On account of the weight of the shaft of the club the loading at the toe is made greater than at the heel.

My invention is applicable to either putters or drivers or other similar clubs. In the case of a driver, the heel and toe may be made heavier by the known method of inserting a plug of lighter material in the central portion of the club head, for example, by boring a recess in the central portion of the club head and filling said recess with a lighter material. 7

The accompanying drawing illustrates two examples of golf club heads constructed according to my invention.

Fig. 1 is a plan view and Fig. 2 a face view of a putter. Fig. 3 is a plan view of a driver.

Referring to Figs. 1 and 2, it will be seen part of the face.

that the" club headhas its striking face A large diameter; The heel and toe of the club headare loaded by weights B inserted in recesses extending upwards from the sole of the club, the recesses being closed by metal plates C secured'to-the sole of the club head which is recessed so that the metal plates C are flush on the surface with the sole ,of the club head. 1

In the driver shown in Fig. 3, the striking face is a convex surface A which-forms part of the surface of a vertical cylinder of large diameter and the club head is loaded at the heel and toe by weights B inserted in V recesses closed by metal sole plates C' similar to those described -with reference to Figs.

l and 2.

The curvature required varies with the shape and weight of the'club head and may be found'by mounting-astraight faced club loaded-as above specified on an axis which is fixed at right angles to the grip and in the same plane as the club face. The club is rotated on the said axis by mechanical means and the extent of the diver 'ence of the flight of a ball struck successively with different parts of the face is noted. From this, the curvature necessary to correct the divergence may be approximately calculated and 'aclub with this curvature can then be c I tested and corrections made on the curvature until the best curve isfound to procure an approximately straight shot from any In the case of a club which does not raise the ball from the ground, the curvature required is a concave one, in the case of a club whichelevates the ball into the air, the desired curvatureis found to be a convex one. o

The curvature required to give perfect correction is not truly cylindrical, but apparticularly at the heel.

I claim. i

proximates more towards a parabolic curve,

1. A golf club head comprising a heavier heel and toe portion than central portion to;

increase'the moment of inertia'of the club' head aboutits vertical axis of rotation under PA ENT" opnc v struck. from said face.

8. A golf club head comprising a heavier heel and toe portion than central portion to p 7 increase the mom'entof inertia of the'club I head about its vertical axis of rotation under 7 impact, in combination with a striking' face curved about a vertical axis;,the,curvature being such as to"impar't an approximately straight motion to a ball struck from any part of the fa-ce.

4.115; golf club head comprising a heavier heel and toe portion than central portion to increase the moment of inertia of the club head abouta verticalaxis' passing approxi mately through the centre of gravity of. the club head, in combination With a striking face Whose surface, forms part of a vertical cylinder of large diameter. l

5. A golf club head as, claimed in claim 4 having a concave striking face I A golf club head comprising a heeland v V toe portion loaded to obtain the maximum momentof inertia of the club head about a vertical axis passing approximately through the centre of gravity of the club head, in

combination With a striking face Whose surface forms part of a vertical cylinder of large diameter. I .v

The foregoing specification signed at Glasgow this 11th day of December, 1928.; v NORMAN STEWVART MAIN.

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