Golf head

Present invention is relative to a golf head. The golf head includes a main part. The main part that is made of metal includes a body portion and a neck portion. A hitting part, which is made of metal that is harder than the main part, has a face portion and a bottom portion. The bottom portion that extrudes from the bottom of the face portion is modeled with the face portion integral whole. The hitting part connects with the body portion of the main part by the rim. The back of the face portion and the top of the bottom portion, which closes to the face portion, suspend in midair. The connective position of the body portion and the rear of the bottom portion crosses the central line of the bottom of the golf head and is partial to rear.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to golf head and more particularly to a golf head structure that uses hard metal to make the main part and models the face and bottom by soft metal integral whole.

2. Description of the Related Art

In prior art, a golf head that is made of soft metal (like soft carbon steel) has the advantage of easy control and it is also easily to adjust the angle of the neck portion. But, the disadvantage is that the grooves on the face damages easily by hitting the ball hardily and the bottom wears down by grinding the ground. It is a practical solution by strengthening the face. For example, using hard metal to make a hitting plate and fixed it on the face. However, this is harmful to the control of the ball. The solution is making the face into a cup shape. The cup shape face has advantages of better bending elasticity and control. The wear-resisting character of the bottom can be improved by using hard metal. But, the face and the bottom are usually made and placed individually in prior art. So, the front bottom of the main part has no protection and damages easily.

SUMMARY OF THE INVENTION

The object of the present invention is providing a golf head, which has both advantages of a main part, which is made of soft metal, and a face and a bottom, which are made of hard metal, at the same time. Meanwhile, the face and the bottom are modeled integral whole to provide a better protection at the front bottom of the golf head.

To achieve the object of the present invention, the golf head of present invention including a main part, which is made of metal, having a body portion and a neck portion. A hitting part, which is made of metal that is harder than the main part, has a face portion and a bottom portion. The bottom portion that extrudes from the bottom of the face portion is modeled with the face portion integral whole. The hitting part connects with the body portion of the main part by the rim. The back of the face portion and the top of the bottom portion, which closes to the face portion, suspend in midair. The connective position of the body portion and the rear bottom portion crosses the central line of the bottom of the golf head and is partial to rear.

DETAILED DESCRIPTION OF THE INVENTION

Referring toFIG. 1toFIG. 4, a golf head in the first embodiment of present invention including:

A main part20is made of metal under 30 in the hardness (HRC). The main part is made of stainless steel 304 in this embodiment and the hardness is 5˜6 (HRC 5˜6). It is quite soft. The main part includes a body portion21and a neck portion22. The body potion21with a hole215at the middle has an up frame211, a down frame212, a toe portion213and a heel portion214. A core portion216extrudes from the upside of the down frame212.

A hitting part30is made of metal over 30 in the hardness (HRC). For example, the metal can be titanium alloy (β 6-4 titanium, HRC 30˜40) or stainless steel 450 (HRC 40˜42) or stainless steel 174 (HRC 30) or maraging steel 465. The hitting part includes a face portion31and a bottom portion32. The up rim of the face portion31connects with the up frame211of the main part and the rear rim of the bottom portion32connects with the down frame212. The core portion216extends forward to the face portion31and maintains a distance between the face portion31and the bottom portion32. That is to say, the hitting part30connects with the body portion21of the main part20by the rim. Meanwhile, the back of the face portion31and the top of the bottom portion32, which closes to the face portion31, suspend in midair. Referring toFIG. 3, the connective position of the body portion21and the rear of the bottom portion32crosses the central line of the bottom of the golf head10and is partial to rear. The connection method can be welding or brazing or them both. The thickness of the face portion31of the hitting part30is better between 1.83˜5 nm to provide a better structurally strength and bending elasticity. The thickness of the bottom portion32is better between 1.0˜2.5 nm to provide a wear-resisting character. A thinner thickness can provide a better elasticity and control.

Referring toFIG. 3andFIG. 4, there are ribs217provided on the bottom of the core portion216that closes to the down frame212in this embodiment. The ribs217touch the top of the rear bottom portion32. This structure helps the assembly and makes sure the distance between the bottom portion32and the core portion216.

Also referring toFIG. 3andFIG. 4, a back part40is placed at the middle of the ringlike body portion21to seal the hole215of the body portion21. This back part40can be made from plastic or fiber reinforced polymer in order to reduce the weight of the golf head. The back part40can also provide a convenience of putting a logo or pattern thereon. So, the manufactures can change the back part easily to satisfy the request of the customers.

Referring toFIG. 5toFIG. 10, these figures show the golf head50of the second embodiment that includes a main part60and a hitting part70.

As theFIG. 9andFIG. 10shown, a top portion73extrudes backward from the top of the face portion71. The end of the top portion73extends downward to form an end portion74. The end portion74provides an engaging pit741thereon. A prominent portion721is provided at the rear of the bottom portion72. The up frame611of the body portion61provides a hook6111to engage with the engaging pit741. The down frame612of the body portion61provides a pit6121. The prominent portion721can engage with the pit6121and combines with the body portion61by brazing. The solder fills up the space of the connective portion. The connective portion rises up as a flange as theFIG. 5toFIG. 9show. The flange will be grinded finally. So, the connective portion will not be able to recognize.

The body portion61has no hole thereon in the second embodiment, so the back part is not needed.

The width of the top portion73is between 5˜6 nm in the second embodiment. Because that the hitting part70has a longer and thinner top portion73and bottom portion72, the hitting part provides a better elastic effect and allows the face portion71having a larger bending range. The deformation quantity of the top portion73and the bottom portion72will absorb the strong hitting stress when hitting a ball. So, the stress, which acts on the connective portion, becomes smaller and the structures of the golf head can become harder and unbreakable.