Source: http://www.google.com/patents/US6783466?dq=6,970,917
Timestamp: 2014-11-26 08:19:10
Document Index: 642896543

Matched Legal Cases: ['art 1', 'art 10', 'art 1', 'art 10', 'art 1', 'art 10', 'art 1', 'art 10', 'art 1', 'art 10', 'art 1']

Patent US6783466 - Golf club head - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThis golf club head is constituted by a front part 1 including a face portion 2 and a crown main portion 3, and a back part 10 forming the remaining portion of the golf club head. A metal material forming the front part 1 has lower Young's modulus than that of a metal material forming the back part 10....http://www.google.com/patents/US6783466?utm_source=gb-gplus-sharePatent US6783466 - Golf club headAdvanced Patent SearchPublication numberUS6783466 B2Publication typeGrantApplication numberUS 09/981,731Publication dateAug 31, 2004Filing dateOct 19, 2001Priority dateOct 19, 2000Fee statusPaidAlso published asUS20020091015Publication number09981731, 981731, US 6783466 B2, US 6783466B2, US-B2-6783466, US6783466 B2, US6783466B2InventorsTeruaki Seki, Masaomi Hiruta, Hideo MatsunagaOriginal AssigneeBridgestone Sports Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (35), Classifications (9), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetGolf club headUS 6783466 B2Abstract This golf club head is constituted by a front part 1 including a face portion 2 and a crown main portion 3, and a back part 10 forming the remaining portion of the golf club head. A metal material forming the front part 1 has lower Young's modulus than that of a metal material forming the back part 10. The front part 1 and the back part 10 are welded. The thickness of the center of the face portion 2 is larger than the thickness of the periphery thereof. The thickness of the vicinity of a highest point 3A of the crown is small.
SUMMARY OF THE INVENTION According to the invention, there is provided a hollow golf club head made of metal comprising a front part having a face portion and a crown portion and made of a homogeneous material and a back part having a sole potion, a side portion, and hosel portion, wherein the front part and the back part are welded.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a golf club head according to an embodiment 1.
FIG. 2 is an exploded sectional view taken on line II�II in FIG. 1.
FIG. 3 is a sectional view taken on line II�II in FIG. 1 when the golf club head is jointed.
FIG. 5 is a sectional view taken on line III�III in FIG. 4.
FIG. 12 is a sectional view taken on line II�II in FIG. 11.
An embodiment 1 will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a golf club head according to the embodiment 1. FIG. 2 is an exploded sectional view taken on line II�II in FIG. 1. FIG. 3 is a sectional view taken on line II�II in FIG. 1 when the golf club head is jointed. FIG. 3 is a side view from the heel side of FIG. 1. FIG. 4 is a back view of a face portion 2. FIG. 5 is a sectional view taken on line III�III in FIG. 4. FIG. 6 is an exploded side view from a heal side of the golf according to the embodiment 1. FIG. 7 is a plan view of the golf club head according to the embodiment 1. FIG. 8 is a side view from the heal side of the golf club head according to the embodiment 1.
Incidentally, definitions of �the highest point� and �the center peak� will be described with reference to FIG. 10 which is a front view of the golf club head viewed from the face surface side in a state where the face portion has been detached. As shown in FIG. 10, the golf club head is set in a measuring instrument so that gaps dT and dH at toe-side and heel-side opposite ends of the sole are equal to each other. An angle θ at this time is a lie angle. Next, a contact point P between the sole portion 11 and the ground line (G.L) is set as a face center position L in a left/right direction, and the slice angle is set to 0 degree. At this time, in the crown portion 3, the highest position is the head highest point 3A, and the highest position in the face center position L is the center peak 3B.
FIG. 11 is a perspective view showing a golf club head according to the embodiment 2. FIG. 12 is a sectional view taken on line II�II in FIG. 11. FIG. 13 is an exploded perspective view showing the golf club head according to the embodiment 2. In FIG. 11, the dotted line designates a front part including a face portion 2 and a crown portion.
EXAMPLE The present invention will be described below more specifically together with an example and a comparative example.
Examples 1 and 2 Golf club heads in Examples 1 and 2 had a configuration described in the embodiment 1. In Example 1, a Ti-6Al-4V alloy was used for the front part 1 formed by integrally casting the face portion and the crown portion. On the other hand, in Example 2, a Ti-6Al-7Nb alloy was used. The thickness of the center portion of the face portion was set to 3 mm, and the thinnest portion of the peripheral portion of the face was set to 2.5 mm. The average thickness of the crown portion was set to about 1.2 mm, and the thickness of the vicinity of the crown highest portion was set to about 0.9 mm. The head body portion including the sole portion and the hosel portion was produced by casting with a Ti-6Al-4V alloy in each of Examples 1 and 2. The thickness of the sole portion and the side portion was 1.2 mm.
Example 3 A golf club head of the example 3 has a structure described in the embodiment 2. A round bar of a Ti-4.5Al-3V-2Mo-2Fe alloy (SP700) produced by a forging machine was used to manufacture a golf club head according to the present invention shown in FIG. 11. First, this round bar was heated to about 800� C., and a face portion and a crown portion were molded integrally by hot forging. This molding was performed through three times of hot forging stages of rough forging, main forging and finish forging.
Comparative Example 1 For comparison, a golf club head was manufactured integrally by a casting method. In this Comparative Example 1, the crown portion was set to 1.2 mm thick uniformly. The other configuration was the same as that in Example 3, as shown in Table 3.
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