Hollow Metal Golf Club Head

This invention relates to a golf club head, and more particularly a golf club head made of such metal as steel and having the same size and configuration as that made of wood.

A hollow metal head has been known. However, such metal head has been shaped to be smaller than that made of wood for the purpose of making it have comparative weight. Such light weight head, however, does not have the same size and configuration as that made of wood. A hollow, thin-wall metal head filled with plastic has been proposed.

In such thin wall metal head, even though it is filled with plastic the face portion of the head is deformed due to repeated shocks caused by impact against golf balls, with the result that the distance and direction of flight of the golf balls would be greatly influenced.

It is an object of this invention to provide an improved golf club head having a light weight but having a sufficient strength and which can be made to have substantially the same size and configuration as a head made of wood.

Another object of this invention is to provide a novel golf club made of metal having a low center of gravity and which can propel a golf ball over a long distrance and in a desired direction.

According to this invention there is provided a golf club head comprising a thin-wall, hollow main body made of metal and provided with a bottom opening, a sole plate made of metal and secured to the main body for closing the bottom opening, and at least one reinforcing rib formed on the inner surface of the sole plate, the reinforcing rib being urged against the inner surface of the face portion of the main body.

FIG. 1 is a longitudinal sectional view showing a golf club head according to this invention;

FIG. 2 is a cross-sectional view of the golf club head shown in FIG. 1;

FIG. 3 is a plan view showing the plan view of the sole plate utilized in the golf club of the invention; and

FIG. 4 is a front view of the sole plate.

As shown in FIGS. 1 and 2, the golf club of this invention comprises a thin wall hollow main body 1 made of metal and having a bottom opening 1a, and a sole plate 2 adapted to close the opening 1a. The main body is made to have substantially the same size and configuration as that made of wood, and it is made of such metal as steel. The main body has a thin wall construction and its face portion 1b has a slightly larger thickness than the outer wall portion 1c as shown in FIG. 2. An outwardly and upwardly inclined shaft connector 1d is integrally provided for one side of the outer wall portion 1c.

As shown in FIGS. 3 and 4, the sole plate 2 is made of such metal as steel. At the periphery of the sole plate 2 is provided a fitting edge adapted to snugly fit the opening 1a of the main body. Furthermore, the sole plate 2 is provided with an upwardly projecting weight container 2b and a plurality of reinforcing ribs 2c adapted to closely engage the rear surface of the face portion 1b of the main body 1. To assemble the sole plate, the weight container 2b and the reinforcing ribs 2c are inserted into the opening 1a to cause the reinforcing ribs to firmly engage the inner surface of the face portion 1b, and then a bolt 3 is inserted into an opening 2d of the sole plate 2 and then threaded into a boss 1e on the inner surface of the outer wall portion 1c.

Then the engaging edge 2a of the sole plate 2 snugly fits with the opening 1a. At this time, it is advantageous to use a bonding agent to completely bond and seal the gap between the edge 2a and the opening 1a, thereby assembling the main body and the sole plate into an integral unit.

It is advantageous to form a boss 2e provided with the opening 2d, and to cause the inner ends of the reinforcing ribs 2c to abut against one side of the boss 2e. As shown in FIG. 3, two reinforcing ribs 2c are provided in a letter V configuration so as to receive the load applied to the face portion 1b by the sole plate 2 through the reinforcing ribs 2c. As shown in FIG. 3, the sole plate 2 is further provided with a rib 2f extending outwardly from the weight container 2b to engage the inner surface of the outer wall portion at a position opposite the face plate portion 1b. Then the load applied to the face portion 1b at the time of shooting a golf ball is received by reinforcing ribs 2c, the sole plate 2 and the outer wall portion 1c of the main body 1. In this case, the rib 2f is provided to extend in the direction of load created at the time of shooting a golf ball.

It should be understood that the number of the reinforcing ribs 2c is not limited to two but may be one, or three, or more. The reinforcing ribs may have peripheral length enough to engage the entire inner surface of the face portion 1b of the main body but the peripheral length of the reinforcing ribs is usually made to correspond to the ball shooting surface of the face portion 1b.

When the golf club head is constructed as above described, the load applied upon the face portion 1 created when it shoots a golf ball is received by the reinforcing ribs 2c of the sole plate 2 which support the inner surface of the face portion 1b so that the face portion 1b is imparted with such sufficiently high strength that it would not be deformed by a number of shocks created at the time of shooting a ball. Moreover, by providing reinforcing ribs 2c for the sole plate 2 it becomes possible to construct the main body 1 to have substantially the same size and configuration as a head made of wood. Moreover, as the main body is a hollow body of thin-wall construction, it is possible to decrease its weight and to design it to have a low center of gravity. Since the head is strong and does not deform, it is not only possible to increase the distance of flight of the ball but also to propel it in the desired direction. Moreover, since the head is made of metal, its durability or life is much longer than the head made of wood.