CN1246055C

CN1246055C - Golf clubhead

Info

Publication number: CN1246055C
Application number: CNB028126238A
Authority: CN
Inventors: R·J·勒斯根; D·M·本内特
Original assignee: Roger Cleveland Golf Co Inc
Current assignee: Roger Cleveland Golf Co Inc
Priority date: 2001-06-25
Filing date: 2002-06-20
Publication date: 2006-03-22
Anticipated expiration: 2022-06-20
Also published as: FR2826285A1; US20040127300A1; WO2003000352A1; CN1520326A; HK1067082A1; FR2826285B1

Abstract

Golf clubhead (1) made from metal, having a strike face (2) which has a loft angle alpha of greater than 45 DEG, said strike (2) face having has a plurality of parallel grooves (10), characterized in that the strike face (2) has a surface roughness Ra of less than 0.25 micrometre, and in that the Vickers hardness of the strike face (2) is greater than 5 GigaPascal.

Description

A kind of golf club head

Invention field

The present invention relates to golf game, particularly, relate to the metal golf club head that is used for the short distance batting.The golf club of this general type can be called the wedge shape bat.More specifically, the present invention relates to the feature that improves its performance of the scope of attack of this bat.

Background technology

The bat that is called the wedge shape bat generally is used for various short distance batting, or seeks to impact out bell track.For example, comprise that batting makes ball break away from the position of difficulty, particularly, breaks away from barrier.By known methods, the scope of attack of this golf club has the obvious inclination of relative vertical plane, and the inclination of the relative vertical plane of the scope of attack is also referred to as the high strike inclination angle, generally is the wedge shape greater than 45 °.By this bigger high strike angle, the track of ball is made progress again forward simultaneously, make the ball of getting that desirable bell track be arranged.

When using wedge shape bat square stance, it is not the track that is orthogonal to club head that the ball that contacts with the club head scope of attack impacts face, but to tilt near the high strike inclination angle.Generation rubs between the ball and the scope of attack, impacts to have caused ball self to rotatablely move.Self the rotatablely moving generally to be called of ball circled round.

Circumnutation is very useful for accurately impacting, because it makes ball that gyroscopic effect be arranged, can make movement locus stable.This circumnutation can reach the thousands of commentaries on classics of per minute.

Although this circumnutation has reduced the movable length of ball, its advantage is to control the motion track of ball better, and this is very useful to the short distance batting.Circumnutation also has the effect of moving after the restriction ball is run into ground.This is because reduced the resilience of ball.Can also see, if there be enough circling round after ball is run into ground, can stop fully.In some cases, when circling round when stronger, also may see after ball is run into ground motion backward occurring.

Therefore, be appreciated that after batting, wish very much to occur circling round with the wedge shape bat.Main purpose of the present invention increases this circling round exactly.

Past has proposed different solutions to increase this circling round.

United States Patent (USP) 5,804,272 have introduced the possibility that the adhesive tab that covers with the material of great friction coefficient covers the scope of attack of bat.More properly, be to cover with the carborundum that one deck has enough granularities, this material can guarantee to trap the puck when impacting ball.

Circle round in order to increase, BP GB1,062,796 has proposed another solution.Definitely, the scheme of document introduction is included on the scope of attack of bat a kind of material is set, and it has caking property or has great friction coefficient.By increasing the surface roughness of the scope of attack, can increase the quantity that acts on the tangential force on the ball when hitting.

Japan Patent JP2000.254256 has also introduced the scheme that another kind of bat increase with big high strike inclination angle is circled round.This scheme can increase the coefficient of friction of the scope of attack and ball.

On the other hand, although increase big high strike angle lofting mashie circle round very importantly, preferably reduce and circle round being used for the bat at little high strike angle of long distance batting.This is because to this batting, the movable length of ball is crucial, and is just so unimportant to the requirement of accuracy.In other words, circle round the control action that produces just not as important like that at the short distance square stance.Consider this point, Japan Patent 10 216 275 has been introduced a kind of technology of handling the scope of attack of bat, and it polishes the scope of attack, carries out carbonization then and increases its hardness.The combination of these two kinds of processing makes bat limit ball to a greater degree and circles round, and the result has increased hitting distance.

Therefore, the objective of the invention is to propose a kind of new solution, can increase circling round of wedge shape bat biglyyer.

Summary of the invention

Therefore, the present invention relates to a kind of golf club head of metal.This head being provided with has the scope of attack of the inclination of relative vertical plane greater than 45 ° high strike inclination angle.This scope of attack comprises the groove that a plurality of surfaces form; Wherein, the described scope of attack has less than 0.25 micron surface roughness Ra with greater than the surperficial Vickers hardness of 5 gpa, and case hardness is more preferably greater than 12 gpa.

In other words, the present invention carries out very crucial polishing to the scope of attack of wedge shape bat, guarantees that simultaneously it has very high hardness.

Astoundingly, after the wedge shape bat has such characteristic, revolve degree after can increasing very bigly, reduce and revolve after friction level reduces to make significantly between the former expectation ball and the scope of attack.

It should be noted that measurement result that surface roughness reduces to increase with hardness from Japan Patent JP 10 216 275, revolve after its objective is minimizing.Therefore, by using former technology of revolving after being used to reduce to obtain paradoxical effect of the present invention.In fact, revolve effect after having increased.

Observe in practice, when the surface roughness Ra of the scope of attack less than 0.15 micron, after revolve further increase.Surface roughness can be determined in standardized mode by standard ISO 4287.The surface roughness curve that obtains according to described standard is got arithmetic average deviation, can determine surface roughness Ra more accurately.

Surface roughness is to measure in the district that impacts of the scope of attack.For this reason, the scope of attack is provided with a plurality of grooves from the teeth outwards, and these grooves have specific shape.In fact, behind the groove that given shape is set, the influence that can find groove shape is not very sensitive, especially when relating to low surface roughness and stiffness characteristics.

In addition, hit very hard of surface, so just limited and occur distortion when oppressing or knocking, and because good wear-resisting wiping and polishing machine are arranged, make to have very that the surface of low surface roughness can keep its pattern.

In fact, had enough Vickers hardness coefficients by adopting Maraging steel to form the scope of attack.Therefore can expect that Maraging steel is to carry out tempering at martensitic state, contain considerably less carbon, then by reheating or tempering is hardened.

Can also use other materials to obtain such surface state, ceramic composite especially, such as carborundum, boron carbide, titanium carbide, zirconium dioxide, the composition of aluminium oxide and these materials.

In fact, surface roughness preferably can change on the whole height of the scope of attack, therefore, has the roughness of some greatly by making scope of attack bottom, and is littler in the roughness on top, can obtain the more best performance of circling round and increasing.

Description of drawings

By below with reference to the introduction of accompanying drawing to embodiment, will clearer understanding be arranged to realizing the advantage that mode of the present invention and the present invention are had, in the accompanying drawing:

Fig. 1 is the side view according to golf club head of the present invention;

Fig. 2 is the front view of the head of Fig. 1.

The specific embodiment

As has already been mentioned above, the present invention relates to a kind of wedge shape golf club head.

As shown in Figure 1, head 1 is provided with the scope of attack 2 of batting, and is called the part 3 and the rear surface 4 of bottom.This head 1 laterally continues by neck 5, and neck can hold the bar of bat.

For the wedge shape bat, the inclination of the scope of attack 2 relative vertical planes (being the high strike inclination alpha) can be 70 ° at most greater than 45 °.

In form shown in Figure 2, the scope of attack 2 has a plurality of parallel slots 10, apart from one another by opening several millimeters.

As has already been mentioned above, bat can use ceramic composite manufacturing, to form the scope of attack.Use carborundum to obtain good result.The surface is polished, and the value that makes surface roughness Ra is less than 0.25 micron.The Vickers hardness of the scope of attack is in the magnitude of 21 gpa.

Thereby, carried out many actual tests for the bat of introducing above, with the increase of determining to circle round.Two bats have been compared in these tests, and two other aspects of bat are all identical except polishing characteristic difference.For the bat that polishes, its surperficial roughness Ra adopts specific ball at 1 to 3 micron, and what observe circles round corresponding to below per minute rotation 4000 commentaries on classics.

At the identical bat below 0.25 micron, it is batted under the same conditions corresponding to bat of the present invention for surface roughness Ra, and the rotation of ball (promptly circling round) can increase more than 60%.

The present invention also tests the quantization influence that ball is run into the track behind the ground.Used two kinds of bats introducing above, surface roughness is not being polished bat and surface roughness at the polishing bat below 0.25 micron more than 1 micron.

Therefore, in first round batting, used and do not polished bat, it is 46 centimetres that ball surpasses the make impact with the ground average distance of a motion of ball.With the identical bat that carries out polishing according to the present invention, take turns in the batting same, made impact with the ground back ball resilience 90 centimetres at ball.

Take turns in the batting at another, to unpolished bat, ball still very near with the rum point on ground.Use the bat of polishing, take turns in the batting, in ball 1.5 meters the distance that made impact with the ground back ball resilience same.

From top test obviously as can be seen, golf club of the present invention has great advantage, can increase the effect of circling round very bigly, has improved the control of wedge shape bat to batting.

Making the scope of attack have quite high hardness can increase circling round of ball, and has limited the deterioration of the surface state of the bat length of life scope of attack.

Claims

1. the golf club head of a metal, be provided with and have the scope of attack (2) of relative vertical plane inclination greater than 45 ° high strike inclination angle (α), the described scope of attack (2) has a plurality of parallel slots (10), it is characterized in that, the described scope of attack (2) has less than 0.25 micron surface roughness Ra with greater than the surperficial Vickers hardness of 5 gpa.

2. golf club head according to claim 1 is characterized in that, the surface roughness Ra of the described scope of attack (2) is less than 0.15 micron.

3. golf club head according to claim 1 is characterized in that, the described scope of attack (2) is to make with Maraging steel.

4. golf club head according to claim 1 is characterized in that, the described scope of attack (2) is to make with ceramic composite.

5. golf club head according to claim 4 is characterized in that, described ceramic composite is from by carborundum, boron carbide, and titanium carbide, zirconia is selected in one group of material that aluminium oxide and above-mentioned material composition are formed.

6. golf club head according to claim 1 is characterized in that, the Vickers hardness of the described scope of attack (2) is greater than 12 gpa.

7. golf club head according to claim 1 is characterized in that, the surface roughness Ra of the described scope of attack reduces highly gradually along the described scope of attack (2).