JPH08229169A - Patter head - Google Patents

Abstract

PURPOSE: To provide a patter head which has no fluctuation of the position of the center of gravity and the wt. balance and gives enough overspin to a hit ball and prevents the rotational force of the ball from being fluctuated caused by a little deviation of the hit point. CONSTITUTION: The whole patter head is cut and formed by applying milling processing to a metal block to avoid fluctuation of the center of gravity. A group of rotation inducing strings 5 are horizontally formed on the face 4. The rotation inducing strings 5 is formed of a circular arc recessed part 5a and a hitting rib part 5b with a micro-curved surface to have a corrugated cross-section. Adjoining pitch P of the hitting rib part 5b is set into a fine value of 0.1-0.9mm and it is accurately formed by side mill processing by one effort.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a putter head which is entirely formed by milling.

[0002]

2. Description of the Related Art Most commercially available putter heads are formed by forging or precision casting, and the face surface is finished by cutting or grinding. It has been proposed to form the face surface with a concavo-convex surface for the purpose of reducing mispatts or facilitating control of hitting balls. In Japanese Patent Laid-Open No. 4-250177, a high-energy laser beam is projected to roughen the entire face surface. In Japanese Utility Model Laid-Open No. 4-90373, saw blade-shaped rib groups are provided in a stepped manner on the face surface. Actual Kaihei 6-
In 19760, a set of lateral grooves is formed on the face surface. Furthermore, a putter head having a face-shaped milling process to form a ripple-like processed mark is commercially available (Trade name: Hiroyuki, Matsumoto).

[0003]

A putter head made of a forged molded product or a cast molded product has variations in shape and size among individual products, although the degree varies.
There is a slight deviation in the position of the center of gravity and the overall weight balance. These slight deviations can be eliminated by repeatedly performing trial hits and careful modification. However, the correction process requires much labor and cost, and in some cases, the entire putter head may be disposed of without being satisfied with the correction result.
For these reasons, most golfers tend to use off-the-shelf putter heads with some doubt.

According to the putter head in which the face surface is provided with a saw-toothed rib group or a group of lateral grooves, it is possible to impart a rotational force (overspin) in the rolling direction to the hit ball to improve the straight running force. However, in the above-described putter head, since the pitch of the ribs and the lateral grooves is coarse, the rotational state of the hit ball greatly changes depending on which part of the face surface in the vertical direction hits the ball surface. In other words, the rolling distance (arrival distance) of the hitting ball changes greatly with a slight deviation of the hitting point, making hitting ball control more difficult than with a putter head whose face surface is finished flat.

On the other hand, in the putter head in which a laser beam is projected on the face surface to form minute unevenness, a slight difference in hitting point can be ignored. On the other hand, it is impossible to give a sufficient overspin to the hit ball. With a putter head that has ripple-shaped processing marks formed on the face surface, when the angle between the put line and the face surface when viewed from above is not in a state of being orthogonal to each other, an oblique rotational force tends to act on the hit ball, which is also difficult to control. Funny

An object of the present invention is to provide a putter head capable of suppressing variations in shape and dimensions to a negligible extent and reproducing the position of the center of gravity and the weight balance without deviation as the designer intended. Another object of the present invention is to provide a putter head which can give a sufficient overspin to a hit ball and can easily control the reaching distance of the hit ball.

[0007]

A putter head according to the present invention comprises a putter head having a face wall 1 which rises upward and a sole wall 2 which projects rearward along a lower edge of the face wall 1. It is formed by milling. A group of rotation-inducing muscles 5 that give overspin to the ball is horizontally formed on the face surface 4 of the face wall 1. The rotation-inducing muscles 5 are arcuate recesses 5 that are recessed toward the inner surface of the face surface 4.
A and a striking rib portion 5b formed of a minute curved surface are formed in a corrugated cross-section that is alternately continuous. Adjacent pitch P of striking rib 5b
Is set to 0.1 to 0.9 mm.

Specifically, the putter head is formed by cutting out using a metal block of any one of copper alloy, steel alloy, titanium, titanium alloy and stainless steel as a raw material. The face surface 4 is slightly bulged along the outline of the face wall 1, and the surface of the bulged portion is subjected to side milling to form a group of rotation-inducing muscles 5.

[0009]

Since the entire putter head is formed by milling, it is possible to reduce variations in the shape and size of the putter head, and to eliminate the fact that the position of the center of gravity and the weight balance are slightly different for each putter head. Arc recess 5a
Since the rotation-inducing streak 5 is formed by the striking rib portion 5b having a minute curved surface and a group of the streak-inducing streak 5 is provided on the face surface 4, sufficient overspin can be given to the hit ball. Moreover,
Since the adjacent pitch P of the striking rib 5b is set to a small value of 0.1 to 0.9 mm, even if the striking position is slightly different, a substantially constant rotational force is applied to the ball, and the reaching distance is large or small. Can be prevented from changing to. Compared to a conventional putter head with a flat face surface, the contact area with the ball is small and the time it takes for the ball to hit the face surface before it is ejected is long, so the ball bites when hit ( Adhesion) is increased and a soft hitting feel is obtained. When the group of rotation-inducing muscles 5 is formed by side milling, the face surface 4 can be formed all at once with high processing accuracy.

[0010]

Since the putter head of the present invention is formed by milling the whole, it is possible to eliminate variations in outer shape and dimensions, and the putter whose center of gravity and weight balance are set as intended by the designer. The head can be reliably provided. Further, since a group of rotation-inducing muscles 5 are precisely formed on the face surface 4 by milling, it is possible to prevent the variation in the reach of the hit ball due to a slight difference in hitting point while giving a sufficient overspin to the hit ball. As a whole, it is possible to obtain a putter head in which the hit ball is easily controlled and there are few miss shots. Since the entire putter head is machined from a metal block by milling, it is possible to eliminate inevitable processing strain and variations in metal structure in the forged or cast putter head.
It is possible to obtain a putter head which is formed of a homogeneous metallographic structure and is capable of exerting uniform physical properties at all times.

[0011]

1 to 5 show an embodiment of a putter head according to the present invention. In FIG. 4, the putter head is formed in an L-shaped cross section with a face wall 1 that rises upward and a sole wall 2 that projects to the back side along the lower edge of the face wall 1, and is placed toward the heel side of the face wall 1. It consists of a machined product in which the boss 3 is integrally provided. Specifically, a putter head can be obtained by performing various milling processes with a numerical control (NC) milling machine using a metal block such as a copper alloy such as adjacent bronze, a steel alloy, titanium, a titanium alloy, and stainless steel. Form. Reference numeral 9 is a shaft.

As shown in FIG. 1, the face wall 1 is formed in a submarine-like outer shape, and the face surface 4 is slightly bulged along the outline of the submarine so that the ball is overspun over the entire bulging surface. A group of rotation-inducing muscles 5 for giving is formed horizontally. The rotation-inducing muscles 5 are formed by using a side mill in a corrugated sectional shape in which arcuate concave portions 5a that are recessed toward the inner surface of the face surface 4 and striking rib portions 5b that are minute arcuate surfaces are alternately continuous.

The radius R1 and the recess depth D of the arc recess 5a are R1 = 0.75 to 1.5 mm and D = 0.02, respectively.
It can be selected in the range of 0.12 mm, preferably R1 = 0.8 to 1.
25 mm and D = 0.05 to 0.09 mm. The adjacent pitch P of the adjacent striking rib portions 5b is set as small as possible in order to prevent the variation of the rotational force due to the slight difference in the hitting points. Specifically, it can be selected within the range of P = 0.1 to 0.9 mm, and more preferably 0.3 to 0.8 mm. Adjacent pitch P is 0.
If it is less than 1 mm, a sufficient torque cannot be applied. On the other hand, if it exceeds 0.9 mm, a slight difference in the hitting point causes a non-negligible variation in the rotational force that can be applied. Striking rib 5b
After forming the circular arc concave portion 5a, buffing is performed to form a minute curved surface. The inclination θ of the face surface 4 can be selected in the range of 1 to 4 degrees, and is 3 degrees in this embodiment.

In FIG. 2, a sole surface 6 including a main sole surface 6a, a front sole surface 6b, and a rear sole surface 6c is provided on the lower surface of the sole wall 2. The main sole surface 6a is provided horizontally at the front-rear center of the sole surface 6, and front and rear sole surfaces 6b and 6c are provided which incline upward from the main sole surface 6a toward the toe side and the heel side, respectively. The upper surface wall 1a on the toe side of the boss 3 of the face wall 2 is formed by a horizontal plane parallel to the main sole surface 6a and the rotation inducing muscles 5. On this top wall 1a,
It is possible to provide a mark or an index for displaying the hit center. The dimensions of each part in the illustrated embodiment are
P = 0.75 mm, D = 0.07 mm and R1 = 1 mm.

As shown in FIGS. 2 and 3, on the back surface of the face wall 1, a laterally long depression 7 is formed corresponding to the sweet spot on the face surface 4. Further, a recess 8 for adjusting the weight balance is formed at the heel-side base end of the boss 3. The recess 7 and the recess 8 are formed by cutting with a ball end mill. This is to avoid a shift in the center of gravity and a variation in gravity balance.

As described above, when the group of rotation-inducing muscles 5 is formed on the face surface 4, the upward movement component at the moment when the face surface 4 separates from the peripheral surface of the ball can give an overspin to the ball. At this time, the striking rib portion 5
Since the adjacent pitch P of b is set to a small value of 0.1 to 0.9 mm, it is possible to prevent the rotational force that can be imparted from greatly fluctuating due to a slight difference in the hitting point, as long as the moment when hitting is constant. , The reach of the hit ball can be made almost constant. Since the rotation-inducing muscles 5 are formed horizontally, when the angle between the face surface 4 when viewed from the plane and the putt line of the ball are not orthogonal, it is possible to prevent an oblique rotational force from being generated in the hit ball, and The hit ball can be controlled more easily than a putter head having a ripple-shaped processing mark.

[Brief description of drawings]

FIG. 1 is a front view of a putter head.

FIG. 2 is a rear view of a putter head.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a perspective view of a putter head.

FIG. 5 is a plan view of a putter head.

[Explanation of symbols]

 1 Face Wall 2 Sole Wall 4 Face Surface 5 Rotation Inducing Muscle 5a Arc Concave 5b Hitting Rib

Claims (2)

[Claims] 1. The entire putter head having a face wall 1 that rises upward and a sole wall 2 that projects to the back side along the lower edge of the face wall 1 is formed by milling. A group of rotation-inducing muscles 5 that give overspin to the ball is formed horizontally on the face surface 4. The rotation-inducing muscles 5 include arcuate recesses 5a that are recessed toward the inner surface side of the face surface 4, and striking rib portions that are formed of minute curved surfaces. A putter head in which 5b and 5b are formed alternately in a corrugated cross-section, and the adjacent pitch P of the striking ribs 5b is set to 0.1 to 0.9 mm. 2. The putter head is formed by carving out a metal block of any one of copper alloy, steel alloy, titanium, titanium alloy, and stainless steel as a raw material, and the face surface 4 is formed as an outline of the face wall 1. 2. The putter head according to claim 1, wherein the putter head is formed so as to be slightly bulged along the side surface, and the surface of the bulged portion is subjected to side milling to form a group of rotation-inducing muscles 5.