Patent ID: 11951364
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 0:
1. An iron-type golf club head comprising:
a face having a striking surface and a back surface opposite to the striking surface, and having a face thickness defined between the striking surface and the back surface, wherein
the back surface is provided with a cavity-forming portion dented toward the striking surface,
the cavity-forming portion is provided with a protuberance in which the face thickness is partially increased,
the protuberance extends in a top-bottom direction of the head, and
the protuberance has a ridge and a pair of inclined surfaces, wherein, in a cross section of the face orthogonal to the striking surface and parallel to a toe-heel direction of the head,
the face thickness measured at the ridge is largest in the protuberance,
one of the inclined surfaces extends toward a toe of the head from the ridge while decreasing the face thickness, and
the other of the inclined surfaces extends toward a heel of the head from the ridge while decreasing the face thickness,
wherein
the back surface is provided with a frame portion surrounding the cavity-forming portion,
the frame portion includes a top side frame portion, a sole side frame portion, and an expansion portion extending toward a center of the face from the sole side frame portion,
the face thickness measured at the expansion portion is larger than the face thickness measured at the protuberance,
the protuberance has a top-side end connected to the top side frame portion and a sole-side end connected to the expansion portion,
the protuberance has a toe-side edge and a heel-side edge, and has a width measured in the head toe-heel direction from the heel-side edge to the toe-side edge,
the expansion portion has a width in the head toe-heel direction which is larger than the width of the protuberance, and the expansion portion extends further towards the toe than the toe-side edge of the protuberance and further towards the heel than the heel-side edge of the protuberance, and
the one of the inclined surfaces and the other of the inclined surfaces intersect so as to form a single ridge line defining the ridge, and the ridge line extends from the top side frame portion to the expansion portion.