JPH07289669A - Golf club and its manufacture - Google Patents

Abstract

PURPOSE:To increase the stability of a golf beginner's feeling about a distance and reduce production cost by fitting the second member of such a material as having higher specific gravity than the first member to the toe and heel sections of a golf club head formed out of the first member of such a material as having low specific gravity. CONSTITUTION:A golf club has a club head formed out of the first member of such a material as having low specific gravity, and the second member 20 of such a material as having higher specific gravity than the first low specific gravity material member at a toe section 1 and a heel section 2, respectively. Namely, the head body 3 of the golf club is made of a material having low specific gravity, and a material having higher specific gravity is fixed to the toe section 1 and the heel section 2 thereof. The golf club is thus made to have a high center of gravity, and the shape, size and weight are approximated to an ordinary golf club. According to this construction, a golf club of precious titanium can be made inexpensive via a metal injection molding process. Furthermore, the total weight of the golf club can be arbitrarily made variable and the center of gravity can be easily made variable, due to the material of the sections 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club composed of different metals having different specific gravities and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, golf clubs have been commercialized in various types due to their new shapes and new materials. Under these circumstances, the popularity of wide spot, low specific gravity clubs is particularly prominent. In patterns, large head clubs made of lightweight materials such as pin type, iron for cavity back type, wood for Ti are widely used by professionals to amateurs. It is used. Iron
Japanese Unexamined Patent Publication No. 63-290590 discloses an integrally joined composite material manufactured by a forging method.
The No. 86 hollow head body is made of Ti or a Ti alloy, and a back weight is fixed to the inside of the rear part of the body to produce a product. Pin type and its deformation pattern
Most of the heads are made of a single material. The total weight adjustment is
The mainstream is to stick a Pb alloy with a double-sided adhesive on the rear part, and there is an actual example of an iron that is mounted by a coin on the rear part.

FIG. 4 shows a pin type putter head which is a conventional golf putter made of titanium (hereinafter referred to as Ti). FIG. 4A is an upper plan view (cross-sectional view) seen from above, and FIG. 4B is a side view thereof. In the figure, 1 is a front end portion, 2 is a rear end portion, 3
Is a golf club putter body, 4 is a golf ball, 10 is a ball striking surface, 11 is a putter upper surface, 12 is a side egre portion, and 13 is a rear egre portion. In the figure, the unit of the numerical value is mm, and 9.74 mm indicates the difference between the relative center positions of the golf balls 4 and the putter body 3 when viewed on the projection surface. is there.
CL is the center line of the putter body 3.

[0004]

However, the above-mentioned products have a problem that the range of the wide spot is restricted in a pin type pattern, for example. Further, as the center of gravity is lowered, as shown in FIG. 4, the hitting point becomes large in deviation between the center of the ball and the center of gravity of the club, so that there is a problem that a high level of proficiency is required for the feeling of putting distance.

Further, even if a low specific gravity material is used, the weight of the pattern head is usually 325 g in total, so that the head becomes a temporarily used large head. In addition, there is almost no practical example of a pattern for a Ti alloy that has become popular in iron and wood in recent years. Therefore, it is difficult to meet the demands of golfers who want to use Ti alloy for all golf clubs. Iron (Japanese Patent Laid-Open No. 63-290
590) and Wood (JP-A-63-154186).
Is the fixation of the back weight to the rear part, and limits the range of wide spotting as described above.

Further, Ti and Ti alloys are active metals, and casting is performed in a high vacuum. In addition to difficult cutting and ignition, it is necessary to pay attention to cutting, and the golf head has a drawback that it becomes expensive. ing. Furthermore, in a golf club having a commonly used shape, size and weight, if the club body is made of a material having a low specific gravity, it becomes a peculiar club like the above-mentioned large head and loses portability.

[0007]

According to the present invention, there is provided a golf club and a method for manufacturing the same, wherein a club head formed of a first member made of a material having a low specific gravity, and a front end portion and a rear end portion of the club head, respectively. It is characterized in that it has a second member made of a material having a higher specific gravity than that of the first member made of a material having a low specific gravity.

The first member made of a material having a low specific gravity is
It is characterized by being composed of any one of Al, Al alloy, Ti, Ti alloy, synthetic resin and ceramic.

Further, it is characterized in that the specific gravity ratio of the first member made of a material having a low specific gravity and the second member made of a material having a high specific gravity is set to 3 times or more.

That is, in order to solve the above problems, it is intended to widen the spot and to enhance the portability,
The golf club head body is made of low specific gravity material,
By fixing a material having a higher specific gravity to the rear end portion, a high center of gravity was obtained, and the shape, dimension, and weight were approximated to those of an ordinary golf club. In addition, an expensive Ti golf club is made inexpensive by metal injection molding (hereinafter referred to as MIM method), and the total weight can be arbitrarily changed and the material of the front end and the rear end (specific gravity of super-heavy metal). However, it is easy to change the position of the center of gravity, and so on.

It is an object of the present invention to increase the stability of the sense of distance, especially for beginner golfers, by enlarging the wide spot, and to contribute to the reduction of the manufacturing cost of golf clubs.

[0012]

According to the present invention, a club head made of a material having a low specific gravity is mounted with a different material having a high specific gravity at the front end portion and the rear end portion thereof. As shown in FIG. 1, it is possible to achieve a wide spot.

In FIG. 1, the horizontal axis represents the distance from the center of the putter head at the dividing point when the putter head is divided into left and right parts and the weight ratio of the left and right parts is measured. The unit is mm. The vertical axis indicates the weight ratio WR / WL between the weight WR of the right side portion and the weight WL of the left side portion. And, 5 shows the conventional putter, and 6 shows the characteristics of the putter according to the embodiment of the present invention. Further, 1 is a front end portion, 2 is a rear end portion, portions where high specific gravity materials are provided respectively, 3 is a putter body, 11 is a putter upper surface, and 13 is a rear egre portion. . As can be seen from the figure, the putter (6) according to the later-described embodiment of the present invention has a more uniform weight balance on the left and right as compared with the conventional putter (5), and as described above, the putter (6) has a high wide spot. is there.

Further, in the head having the same shape, the center of gravity of the head can be made higher, and the center of gravity of the head and the maximum diameter of the ball can be easily brought closer to each other, and the stability of the sense of distance can be improved even in the golfer having the initial stance. This will be described later with reference to FIGS.
More clear.

Next, according to the MIM method of the present invention, it is possible to manufacture a complex-shaped head at low cost. Further, the lower the specific gravity of the head, the higher the center of gravity can be made. Therefore, the maximum diameter of the ball and the center of gravity become closer to each other.

Therefore, the materials of the head body are Al and A
In order to make the total weight of the club to be 325 g, in order to make the total weight of the club to be 325 g, the effect is enhanced by adopting the W alloy at the front end and the rear end. To further explain the present invention, by providing a weight difference between the front end and the rear end,
Makes it easy to change the center of gravity of the head. Further, if the front end portion and the rear end portion are easily attached, for example, according to the screwing method, the degree of freedom in adjusting the total weight is increased.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 2 shows a pure Ti head body prepared by the MIM method according to an embodiment of the present invention, and a W-Ni-Cu (density 17.6) cylinder at the front and rear ends by the powder metallurgy method. Shows a golf club in which is fixed with screws. In FIG. 2, (a) is an upper plan view (cross section) seen from above, (b) is a side view, and 1 is a front end portion, 2 is a rear end portion, 3 is a golf club, for example, a putter main body, 4 is a Golf ball, 10 is a hitting surface, 11 is an upper surface of a putter, 12 is an egre portion of a side portion, 1
3 is the rear egre part, 20 is super-heavy metal, and CL is the center line of the putter body 3. In the present embodiment, the total weight of the head can be adjusted by changing the length of the cylinder of the super heavy metal 20.

In FIG. 2, the unit of the entered numbers is mm, and 4.92 mm means the difference between the relative positions of the weight centers of the golf ball and the putter when viewed on the projection plane. Is shown. From this, it can be seen that the pattern of this embodiment has a high center of gravity.

The flow of manufacturing the putter head body 3 made of pure Ti by the MIM method and the manufacturing conditions thereof are shown below.

[0021]

[Table 1]

(2) Main manufacturing conditions Metal powder-Pure Ti gas atomized powder-Particle size 45 micron or less-Composition carbon content 0.3% or less Oxygen content 0.3% or less Inevitable impurity element binder-composition thermoplastic resin , Wax as a main component, and if necessary, a plasticizer, a lubricant, and a degreasing accelerator.

-PBMA (polybutyl methacrylate) -EVA (ethylene vinyl acetate copolymer) -wax-DBP (dibutyl phthalate) compound 110 ° C under pressure kneader 1 hour
Kneading Degreasing under reduced pressure 400 ° C × 1Hr Sintered Ar ₂ atmosphere 1250 ° C × 3Hr Secondary processing Mechanical processing such as polishing of ball striking surface (3) Characteristics Katasa: Hv 250 Super pure gold (W-Ni-Cu specific gravity 17.6) 20 obtained by the powder metallurgy method on the pure Ti head body manufactured under the above conditions.
The front end portion 1 and the rear end portion 2 of the above were fixed by screwing 135 g of each cylinder, and a golf putter head having a total weight of 320 g was manufactured.

The fixing of the super heavy metal 20 to the putter body 3 is
Besides screwing, it is possible to use welding, adhesion, etc.
The point is that it should be fixed.

[Embodiment 2] FIG. 3 shows another embodiment of the present invention, which is a putter body 3 which is a putter head body made of pure Ti by the MIM method, a front end portion 1 and a rear end portion of the superheavy metal 20. 2 shows a golf club manufactured as 2 and fixed with silver solder. 3, (a) is an upper plan view (cross section) seen from above, (b) is a side view, and (c) is a cross-sectional view taken along the line AA of (a).

In the figure, 1 is a front end portion, 2 is a rear end portion, 3
Is a golf club, for example, a putter body, 4 is a golf ball, 10 is a hitting surface, 11 is a putter upper surface, 12 is a side egre part, 13 is a rear egre part, 20 is super-heavy metal, CL
Indicate the center lines of the putter main body 3, respectively.

In FIG. 3, the unit of the entered numbers is mm, and 7.57 mm means the difference between the relative center positions of the golf balls and putters when viewed on the projection plane. Is shown.

(1) Main manufacturing conditions Pure Ti head body Same as in Example 1 Super-polymerized gold 1) Metal powder W Average particle size 4 micron mm 95.8% by weight Ni reduced powder 2.5% by weight Cu electrolytic powder 1. 3% by weight 2) Binder composition and compound Same as in Example 1 3) Degreasing under reduced pressure 400 ° C. × 1 Hr sintering Ar ₂ atmosphere 1400 ° C. × 3 Hr 4) Characteristic specific gravity 17.8 silver brazing and brazing conditions silver brazing JISZ-3261 BAg -8 Composition Ag 71 to 73% by weight Cu 27 to 29% by weight Brazing temperature 790 ° C. Under the above conditions, the weight of super-polymerized gold is 190 g, golf pattern.
A total head weight of 325 g was produced.

Further, although the above embodiment shows an example in which the present invention is applied to a putter, the present invention is not necessarily limited to a putter, and the present invention can be applied to other irons, woods and the like.

[0030]

As described above, according to the present invention, the shape, size, and weight of the golf club are normally used by mounting different materials having a larger specific gravity than the main body of the club on the front end and the rear end of the golf club. The pattern is similar to the golf club described above, and the pattern contributes to stabilizing the sense of distance for beginner golfers by widening the spot and increasing the center of gravity. In addition, the total weight of the club can be easily changed, and the appearance of the conventional weight sticking is impaired, and the disadvantage that the weight cannot be reduced can be eliminated.

Further, the position of the center of gravity can be arbitrarily adjusted by the golfer himself by changing the weights of the front end portion and the rear end portion. In addition, iron and wood also have the effect of expanding the wide spot, which matches the trends of golf clubs in recent years. As a new material,
Regarding Ti material, which is drawing attention in golf clubs, patterns, irons, woods and all golf clubs can be procured at low cost.

[Brief description of drawings]

FIG. 1 is a correlation diagram of a deviation amount from a center of gravity and a weight ratio of right and left portions of a head.

FIG. 2 is a cross-sectional view of a golf club (pattern head) in which a front end portion and a rear end portion are cylindrical according to an embodiment of the present invention.

FIG. 3 is a sectional view of a golf club (pattern head) according to an example of the present invention by the MIM method.

FIG. 4 is a sectional view of a conventional pin type golf putter head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tip part 2 ... Rear end part 3 ... Golf club (putter) main body 4 ... Golf ball 5 ... Characteristics of putter according to prior art 6 ... Characteristics of putter according to the present invention 10 ・ ・ Striking surface 11 ・ ・ Patter upper surface 12 ・ ・ Eggle part on side 13 ・ ・ Eggle part on rear 20 ・ ・ Super heavy metal

Claims (6)

[Claims] 1. A club head composed of a first member made of a material having a low specific gravity, and a first member made of a material having a low specific gravity provided at each of a front end portion and a rear end portion of the club head. Also has a second member made of a material having a high specific gravity. 2. The first member made of a material having a low specific gravity is A
The golf club according to claim 1, wherein the golf club is made of any one of l, Al alloy, Ti, Ti alloy, synthetic resin, and ceramic. 3. The method for manufacturing a golf club according to claim 1, wherein the first member made of a material having a low specific gravity and the second member made of a material having a high specific gravity are manufactured by a metal injection molding method. 4. The golf club according to claim 1, wherein the specific gravity ratio of the first member made of the material having the low specific gravity and the second member made of the material having the high specific gravity is set to 3 times or more. club. 5. The golf club according to claim 1, wherein the material of the second member made of the material having the high specific gravity that forms the front end portion and the rear end portion is different from each other. 6. The club head, wherein the materials of the second member made of the material having the high specific gravity forming the front end portion and the rear end portion are different or the same kind of metal, and the metal forming the second member is the club head. A golf club characterized by being attachable to and detachable from.