Wood-type golf clubhead
First Claim
1. A wood-type golf club head having a volume of not less than 300 cc, which comprises a main body and a face member disposed at the front of the main body to form a clubface, said face member formed by (i) forging an alpha-beta-type titanium alloy at a temperature which is less than the transformation temperature to the beta phase of the alloy, said temperature being not more than 100°
- C. less than said transformation temperature, and (ii) subsequent slow air cooling made without a blower within a temperature range of from 0 to 100°
C., wherein,the face member is welded to the main body to form a junction therebetween, at least a part of said junction shifted backwards from the edge of the clubface by at least 5 mm, and the total length of the edge of the clubface where the extension is at least 5 mm is not less than 40% of the entire length of the edge, wherein the clubface F has a Vickers hardness in a range of from 300 to 380 Hv when measured according to Japanese Industrial Standard JIS-Z2244 with a load of 50 gf and a load duration time of ten seconds.
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Accused Products
Abstract
A wood-type golf club head containing a volume which is not less than 300 cc, including a main body and a face member disposed on the front of the main body to form a clubface. The face member is formed by (i) forging an alpha-beta-type titanium alloy at a temperature which is less than the transformation temperature to the beta phase of the alloy, and of which difference from the transformation temperature to the beta phase is not more than 100 deg.C., and (ii) subsequent cooling within a temperature range of from 0 to 100 deg.C. The face member is welded to the main body to form a junction therebetween, wherein the junction is partially or wholly shifted backwards from the edge of the clubface by at least 5 mm, and the total length of the edge of the clubface where the shift is at least 5 mm, is not less than 40% of the whole length of the edge.
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Citations
14 Claims
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1. A wood-type golf club head having a volume of not less than 300 cc, which comprises a main body and a face member disposed at the front of the main body to form a clubface, said face member formed by (i) forging an alpha-beta-type titanium alloy at a temperature which is less than the transformation temperature to the beta phase of the alloy, said temperature being not more than 100°
- C. less than said transformation temperature, and (ii) subsequent slow air cooling made without a blower within a temperature range of from 0 to 100°
C., wherein,the face member is welded to the main body to form a junction therebetween, at least a part of said junction shifted backwards from the edge of the clubface by at least 5 mm, and the total length of the edge of the clubface where the extension is at least 5 mm is not less than 40% of the entire length of the edge, wherein the clubface F has a Vickers hardness in a range of from 300 to 380 Hv when measured according to Japanese Industrial Standard JIS-Z2244 with a load of 50 gf and a load duration time of ten seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- C. less than said transformation temperature, and (ii) subsequent slow air cooling made without a blower within a temperature range of from 0 to 100°
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14. A wood-type golf club head which comprises
a main body; - and
a face member disposed at the front of the main body to form a clubface, said face member being formed from an alpha-beta-type titanium alloy and attached to the main body to form a junction therebetween, at least a part of said junction shifted backwards from the edge of the clubface by at least 5 mm, and the total length of the edge of the clubface where the extension is at least 5 mm is not less than 40% of the entire length of the edge and said clubface having a Vickers hardness in a range of from 300 to 380 Hv when measured according to Japanese Industrial Standard JIS-Z2244 with a load of 50 gf and a load duration time of ten seconds.
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Specification