Golf club
First Claim
1. A golf club comprising:
- a grip;
a shaft having a hollow portion therein, said shaft being attached to said grip;
a head having a front surface, a sweet spot on the front surface, and a hollow passage formed inside the head and communicating with said hollow portion of said shaft, said hollow passage extending behind the sweet spot and having an enlarged portion behind the sweet spot, which is greater in size than other portions of the hollow passage; and
movable material means movable in said hollow passage and hollow portion and being contained therein so that when said golf club is swung, said movable material means is moved in said hollow passage and hollow portion for changing the location of the center of gravity of the golf club, and when the head comes to a point of impact, the movable material means is located in the hollow passage including the enlarged portion behind the sweet spot.
1 Assignment
0 Petitions
Accused Products
Abstract
A golf club of the invention is basically formed of a head, grip and shaft for connecting the head and grip. The head of the golf club has a sweet spot on a face surface thereof. A hollow passage extending through the grip, shaft and head is formed in the golf club, and reaches a location behind the sweet spot at the face surface of the head. Weighted materials, such as iron beads are contained in the hollow passage. When the golf club is swung to a top of back swing, the iron beads are positioned adjacent the forward end of the grip, i.e., such as the lowest end of the golf club. However, when the golf club is swung to a point of impact, the iron beads, or other materials reach the sweet spot at a high speed in receipt of a centrifugal force of the golf club to thereby increase a driving force to be applied to a ball. Thus, a flying distance of the ball can be greatly increased without changing the exterior shape or material of the face surface of the head.
76 Citations
8 Claims
-
1. A golf club comprising:
-
a grip; a shaft having a hollow portion therein, said shaft being attached to said grip; a head having a front surface, a sweet spot on the front surface, and a hollow passage formed inside the head and communicating with said hollow portion of said shaft, said hollow passage extending behind the sweet spot and having an enlarged portion behind the sweet spot, which is greater in size than other portions of the hollow passage; and movable material means movable in said hollow passage and hollow portion and being contained therein so that when said golf club is swung, said movable material means is moved in said hollow passage and hollow portion for changing the location of the center of gravity of the golf club, and when the head comes to a point of impact, the movable material means is located in the hollow passage including the enlarged portion behind the sweet spot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification