JP5182979B2 - Golf club having an iron-type head - Google Patents

Description

  The present invention relates to a golf club having an iron-type head.

When a golf club having an iron-type head is hit with a fairway, the lower portion of the head is the hit position. Further, in order to improve the hit feeling, it is necessary to increase the thickness of the hitting position. However, if the thickness of the entire face portion is increased, the head becomes heavier than necessary. Therefore, the present inventor made the invention disclosed in Patent Document 1 below, and provided a golf club having an iron-type head that is easy to hit by preventing a sudden change in hit feeling without increasing the weight excessively and improving hit feeling. .
JP 2007-289639 A

However, the structure of Patent Document 1 is not the best and there is room for further improvement.
Therefore, the problem to be solved by the present invention is that, even if the weight is not increased, the center of gravity is lowered to obtain a higher trajectory ball, and it is easier to detect that the ball has been hit with the core, thereby improving the hit feeling. It is an object of the present invention to provide a golf club having an iron-type head that is easy to hit.

In the first aspect of the invention, the rear side of the face portion covers the periphery of the head with a thick edge portion, and the lower side of the edge portion of the top portion is a thin wall portion thinner than the edge portion, lower thin portion, back to the rate of increase in the thickness increases as the downward Ri consists curved, a thickness increasing portion which is stepped continuously without connection to the lower end of the thin portion, the meat thickness increasing portion In the central region in the toe-heel direction excluding the head-toe-toe region and the heel-side region, a thicker part thicker than the increased thickness part is provided. The upper end of the thick part is higher than the center of gravity of the head, and the thickness is increased stepwise, and the lower region of the thick part is formed thicker than the upper end. The lower end portion of the flesh portion is connected to the edge portion on the sole portion side, and the toe portion close region and the heel portion close region adjacent to the thick wall portion are 70% or less of the height to the position where the perpendicular passing through the center of gravity of the head intersects with the top line of the head viewed from the front in the state where the thickness is increased and the head is in a standard mounting state with a predetermined lie angle. A golf club having an iron-type head is provided in which the upper end portion of the thick-walled portion is located at a height position of the iron-type head.
The rate of increase in the thickness of the wall thickness increasing portion becomes larger as the lower relates to the fact that, somewhere on the rear side of the face portion, when the count number that is usually stamped, engraved or patterns such as trade names exist, The invention configuration is judged as not having these.
The upper end portion of the thick portion is at a position higher than the center of gravity of the head, and the thick portion includes a sweet spot.
70% or less is preferably 65% or less. Including the lower limit, it is 45% to 70%, and in a narrower range, it is 50% to 65%.

The second invention is configured such that the center of gravity of the first invention is located inside the thick portion.
In the third invention, the sweet spot according to the first or second invention is such that a perpendicular passing through the center of gravity of the head intersects with the top line of the head as viewed from the front in a state where the head is in a standard mounting state with a predetermined lie angle. It is configured so that it is at a height position that is ½ or less of the height to the position where it is to be.

  In 4th invention, the said gravity center of 1st-3rd invention is comprised so that it may be located above the intermediate position of the vertical direction width | variety of the said thick part cut off by the said perpendicular in front view.

In the fifth aspect of the invention, the upper end line of the thick part of the first to fourth aspects is substantially straight, and the directing direction is horizontal when the head is in the standard placement state with a predetermined lie angle. As 0 degree, it is comprised so that it may exist in the range of +20 degree which a toe side rises from 0 degree.
In a sixth aspect of the present invention, when viewed from the front when the heads of the first to fifth aspects of the present invention are in the standard placement state with a predetermined lie angle, a horizontal line passing through the middle position of the upper end line of the thick part is the outer circumference of the head. The length of the upper end portion along the horizontal line is 30% or less with respect to the distance between the intersecting heel side point and toe side point.

  In the first aspect of the invention, the lower part of the edge is a thin part, and the lower part is a thickened part in which the back surface is curved and the thickness increase rate is increased downward. More mass (weight) can be removed from the upper side than when formed, and it can be distributed to the lower side and the periphery, and it is possible to effectively lower the center of gravity and increase the moment of inertia. In addition, since the center of gravity is located at the thick part in front view, the thick part can be hit in an area where a good and good hit feeling can be maintained. When the hit points of the ball vary, the thick part is thickened in steps, so that the hit at the thick part is clearer than the case where the surrounding thin wall area becomes the hit point. Has a different feel. For this reason, it is possible to clearly detect whether the player has hit or missed as intended, and a sharp feel in this sense can be obtained. In addition, the upper end of the thick part is positioned 30% or more below the top of the head, and the thin part of the thin part and the increased thickness part exists above this. The center of gravity is reduced as much as possible, and the thin area (face part) can be deformed at the time of hitting to improve the resilience.

In the second invention, since the center of gravity is located inside the thick wall portion, the feeling of hitting at the time of hitting is further clarified. A firm feel.
In the third invention, since the sweet spot is at a position below the intermediate position in the vertical direction, the center of gravity is lowered.

  As a whole of the present application, the center of gravity of the head is lowered to make the ball hit by the sweet spot have a high trajectory, but in this fourth invention, the thick wall portion that becomes the hitting ball area is lowered relative to the center of gravity. The center of gravity is positioned above the middle of the thick portion in the vertical direction. In other words, the thick part is an area that can be hit with a (sharp) hit feeling, and when hitting the middle of the upper and lower parts of the thick part, the hit point is below the sweet spot. Position. For this reason, when the sphere leaves the head, the face surface is in a standing state that is nearly vertical, which is the same as hitting with a head having a small loft angle. A head with a small loft angle is a head with a small count, and in that sense, a flight distance can also be obtained.

In the fifth aspect of the invention, this angle range is within the range of increase in the head height due to the upward inclination of the top line from the heel side to the toe side, and within this range, the toe side height of the thick part is healed. The same or higher on the side means that when hitting near the toe part in the thick part range in the toe / heel direction, the vertical width of the hit at that part is wide, and in that sense the hit feeling changes , Variation can be suppressed.
In the sixth aspect of the invention, by narrowing the range of the thick part, it is possible to distribute the weight in the case of widening downward, and to lower the center of gravity.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 shows the vicinity of a golf club head according to the present invention, and is a front view of the golf club head placed on a reference plane at a predetermined lie angle θ and a predetermined loft angle. FIG. 2 is viewed from the rear side of the head. 3 is a cross-sectional view taken along the arrow line CC, FIG. 4 is a cross-sectional view taken along the arrow line DD, FIG. 5 is a cross-sectional view taken along the arrow line EE, and FIG. It is the figure visually recognized. In FIG. 4, for the convenience of explanation, the enlargement ratio is made larger than those in FIGS. 3 and 5, and hatching is omitted. The head 20 is made of metal (made of iron), and integrally has a hosel portion 22 that receives and connects the tip portion of the shaft 10. It has a face portion 20F having a face surface in front of the head, a top portion 20TP, a toe portion 20T, a heel portion 20H, and a sole portion 20S, and is integrally formed except for a weight member WT described later.

  A top view front line (and its extension line) L1 of the top portion has a forwardly inclined shape in which the heel portion side is low and the toe portion side is high. The back side of the head (the rear side of the face part) is covered with edges FTP, FT, FS, and FH with appropriate thickness around the head periphery, and the edges Z1, Z2, and Z3 are surrounded by this edge part. Yes. The top edge is FTP, the toe edge is FT, the sole edge is FS, and the heel edge is FH. Below the edge FTP of the top part is a thin part Z1 thinner than the edge, and in this embodiment example, it is formed substantially along the top line L1. The lower side of the thin wall portion is a thickness increasing portion Z2, which will be described later, and the lower side of the thickness increasing portion, and in the center region in the toe-heel direction, the periphery of the thickness increasing portion is A thick portion Z3 thickened in steps is provided. The additional portion (hatched portion in FIG. 4) with respect to the thickened portion of the thick portion may be formed of a different material and integrated.

  The thicker portion is thicker toward the lower side, and in this example, the back surface of the thicker portion (the surface that is visible in a substantially trapezoidal shape in FIG. 2) is a single plane. A curved surface that is gentler than the back surface of the thickened portion may be used. Further, on the inner peripheral side of the sole portion edge portion FS, a central region FSB in the toe-heel direction of the edge portion is lowered downward with respect to the toe portion side and the heel portion side, and the upper surface is depressed downward. The lower surface (upper wall surface 20SK described later) bulges downward. In addition, the sole portion edge central region FSB is thicker in the sole portion edge portion FS than the heel side region and the toe side region in terms of the average in the longitudinal direction. The lower end portion of the thick portion Z3 is connected and integrated with the central region edge portion FSB. Further, the edge FSB is stepped or steeply thicker than the lower end of the thick part (thickness in the direction toward the face surface as with other thicknesses).

  In general, the directional line at the upper end of the trapezoidal thick portion Z3 is in the direction of an angle β with respect to the horizontal line, and in this example, it is about 10 degrees. The angle β is preferably in the range of 0 degrees to +20 degrees. The center of gravity G of the head is in the range of expansion of the thick portion Z3 in FIG. 2, and the point where the perpendicular L2 passing through the center of gravity G of FIG. 2 intersects the top line of the head of FIG. The height position H2 is at a position lower than ½ of the height H0 of this point P1. In addition, a position CP that is ½ of the vertical width L of the thick portion Z3 measured along the perpendicular L2 is below the center of gravity G. Furthermore, the height H1 up to the upper end of the thick portion where the perpendicular line L2 intersects in FIG. 2 is 70% or less of the height H0 and 45% or more. More narrowly, it is 50% to 65% of H0. Between the thick wall portion and the top edge portion FTP, the wall thickness is thin, and the face portion is easily deformed at the time of hitting.

  Further, the horizontal line passing through the middle position in the toe / heel direction of the upper end of the thick wall portion corresponds to the distance between the heel side point and the toe side point intersecting the outer periphery of the head in FIG. The length of the upper end of the thick part along the horizontal line passing through the intermediate position is 30% or less with respect to the distance between the intersecting heel side point and toe side point. Preferably, it is 18 to 25%. Further, the middle position in the toe / heel direction of the upper end portion of the thick portion is located closer to the toe by δ than the position of the center of gravity G (or the sweet spot SS). That is, the thick portion is somewhat closer to the toe at the position in the toe-heel direction. δ is in the range of 0 mm to 5 mm. This can improve the hit feeling.

As can be seen with reference to FIG. 4, the center of gravity G of the head is located within the thickness range of the thick portion Z3 in FIG. 4 as well. Become.
Although it is a matter regarding the fourth invention, the center position CP in the vertical direction of the thick part is below the center of gravity G, and the thick part as a hitting area is lowered relative to the head center of gravity G. ing. In other words, the thick portion is an area that can be struck with a (sharp) hit feeling, and when hitting the center of the thick portion consciously, that is, not the head sweet spot SS When the ball is hit at a slightly lower position SS ′, when the ball leaves the head, the face surface stands somewhat vertical, which is the same as hitting with a head having a small loft angle. A head with a small loft angle is a head with a small count, and in that sense, a flight distance can also be obtained.

  The thin portion Z1 has a constant thickness t0 (for example, 2.7 mm for a 7 iron), and the width from the lower end of the edge FTP at the top portion is 6 to 12 mm, preferably 7 to 10 mm. However, the wall thickness is not limited to a certain thickness as long as it is thinner than the edge FTP. The thickened portion Z2 is continuously connected to the lower end of the thin portion without a step. However, if there is a stamp or pattern such as a number number or product name that is normally stamped in this connection area, the determination is made by ignoring these. In this example, the surface (back surface) of the thickness increasing portion is formed in an arc shape having a radius R that is perpendicular to the face surface of the face portion 20F and has a center above a reference line passing through the lower end of the thin portion, Convex on the face side. Therefore, the rate of increase of the thickness t increases as the thickness increases in the downward direction. For this reason, the mass (weight) above the head can be effectively transferred and distributed downward, and the center of gravity G of the head can be lowered. Therefore, it does not necessarily need to be a circular arc, may be an ellipse, may be formed as a parabola, and may be any curve as long as the rate of increase in wall thickness increases downward.

The R is, for example, 100 mm and may be 50 mm to 150 mm.
The thicknesses t1, t2, t3, and t4 in FIG. 4 are 3.3 mm, 4.8 mm, 5.8 mm, and 10.5 mm, for example, by taking the 7th iron. The wall thickness t3 is for a line indicated by a one-dot chain line in which the rear surface of the wall thickness increasing portion is virtually extended into the wall thickness portion when the radius R is 100 mm. The wall thickness t4 is 150 to 230%, preferably 170 to 210%, and about twice that of t3. The wall thickness t2 is 120 to 200%, preferably 140 to 180%, and about 1.5 times t1. In this way, since the lower wall thickness is made relatively thicker, the hit feeling can be improved and the center of gravity can be lowered, and in particular, the thick wall portion can be set low and the hitting ball position can be set at the lower part of the head. Even if the hit point is shifted to the toe side or the heel side, the difference from the hit feeling at the thick portion can be reduced.

  In FIG. 3, as the thickness change portion Z2, a region Z2A corresponding between the thin portion Z1 and the thick portion Z3 and a heel portion close region Z2C adjacent to the thick portion appear. In FIG. 5, as the thickness change portion Z2, a region Z2A corresponding between the thin portion Z1 and the thick portion Z3, and a toe portion close region Z2B adjacent to the thick portion appear. The thin-walled portion Z1 has a constant thickness t0, and these thick-walled increased portions Z2 are arc-shaped curved back surfaces with a radius R in which the thickness t increases from the top portion side toward the sole portion side. Because of the upwardly inclined shape, the thickness t in the heel portion region is thinner than the thickness t in the toe region region when compared at the same height position in FIG. The top line has an upwardly inclined shape, and the region near the toe portion of the face portion has a large vertical dimension, and the region near the heel portion has a small size. For this reason, if the wall thickness t is the same between the heel portion and the toe portion, the heel portion region becomes difficult to bend at the time of hitting, and the resilience of the heel portion region is reduced. Is made thinner, so that the difference in flexibility with the toe portion-side region is reduced.

  Although different from the scope of the present invention, the regions Z2A, Z2B, and Z2C may be regions that are indistinguishable from the thin-walled portion Z1, for example, the same thickness t0, and the back surface is not a curved surface but a plane. It is also possible to use a curved surface and a plane together.

  In the head of this embodiment, as shown in FIGS. 2 and 6, the back side angle portion of the sole portion 20S is long in the toe-heel direction and contains tungsten or the like, and has a higher specific gravity than the main body. A weight member WT is provided, thereby further reducing the center of gravity and increasing the depth of the center of gravity. The lower surface (sole surface) and the back surface of the member WT are exposed to the outside. Further, the weight is distributed in the toe / heel direction by reducing the central portion and distributing the weight more to the toe portion side and the heel portion side, thereby increasing the moment of inertia. Further, as shown in FIG. 2, the weight member has an arcuate shape that is long in the toe-heel direction, and the heel side end portion and the toe side end portion of the member WT are respectively the lower end portions of the thick portion Z3. It ends at a position higher than the position.

  Further, the upper surface (ceiling surface) 20SK forming the head side recess for receiving the weight member is oriented in a direction orthogonal to the face surface of the face portion. The other surface, the front surface 20SL, is substantially parallel to the face surface. However, in the present application, these forms are not limited to this example.

  The present invention can be used as a golf club having an iron-type head.

FIG. 1 is a view of the vicinity of a head of a golf club according to the present invention, and is a front view of a standard placement. FIG. 2 is a diagram viewed from the rear side of the head. FIG. 3 is a cross-sectional view taken along the line of sight CC. FIG. 4 is a cross-sectional view taken along the line of sight DD. FIG. 5 is a cross-sectional view taken along the line of sight EE. FIG. 6 is a diagram viewed from below F in FIG.

Explanation of symbols

FTP Top edge G Head center of gravity Z1 Thin part Z2 Thickness increase part Z3 Thick part

Claims (6)

The rear side of the face part
The head periphery is covered with a thick edge,
The lower side of the edge part of the top part is a thin part thinner than the edge part,
Lower said thin section, rear so that the rate of increase in the thickness increases as the downward Ri consists curved, a thickness increasing portion which is stepped continuously without connection to the lower end of the thin portion,
A thicker part thicker than the thickened part is provided below the thickened part in a central region in the toe-heel direction excluding the toe part and the heel part of the head. The upper end portion of the thick portion is higher than the center of gravity of the head, and the thickness is increased stepwise, and the lower region of the thick portion is formed thicker than the upper end portion. And the lower end of the thick part is connected to the edge part on the sole part side,
The toe portion and the heel portion adjacent to the thick portion are regions of the thickness increasing portion,
In the state where the head is in the standard mounting state with a predetermined lie angle, the thick wall is at a height position of 70% or less of the height to the position where the perpendicular passing through the center of gravity of the head intersects the top line of the head viewed from the front. A golf club having an iron-type head, wherein an upper end portion of the portion is positioned.   The golf club having an iron-type head according to claim 1, wherein the center of gravity is located inside the thick portion.   The sweet spot is a height of 1/2 or less of the height to the position where the perpendicular passing through the center of gravity of the head intersects with the top line of the head viewed from the front in a state where the head is in a standard mounting state with a predetermined lie angle. A golf club having an iron-type head according to claim 1 or 2 in position.   4. The iron-type golf club head according to claim 1, wherein the center of gravity is located above an intermediate position of a vertical width of the thick portion cut by the perpendicular in a front view. 5. Golf club.   The upper end line of the thick part is substantially straight, and the directing direction is a range of +20 degrees where the horizontal is 0 degrees and the toe side is raised from 0 degrees with the head placed in a standard mounting state with a predetermined lie angle. A golf club having the iron-type head according to claim 1.   In front view with the head placed in a standard lie angle state with a predetermined lie angle, the horizontal line passing through the middle position of the upper end line of the thick wall portion corresponds to the distance between the heel side point and the toe side point where the head outer periphery intersects. The golf club having an iron-type head according to claim 1, wherein a length of the upper end portion along the horizontal line is 30% or less.