Weight adjustable golf club head

Abstract

A weight adjustable golf club head is provided. The club head has a trough at a lower part of the club head's back and a weight positioned inside the trough. The trough is arranged to follow the curvature of the club head's bottom. The trough has a tapered mouth along the surface of the club head and a base. There is an insertion hole at a position along the trough. The weight could be inserted into the trough through the insertion hole, and then slid along the trough. The weight contains a seat, a bolt, and a loading ring. The seat has a locking rim and the positioning rim which are inside the trough's base and mouth respectively when the weight is slid into the trough. The seat's body and the locking rim have a number of breaks so that the locking rim could be stretched. When the bolt is screwed into or out of the seat, the locking rim would be stretched or retracted, so that the weight could be locked or un-locked in the trough. The loading ring is put around the seat and could be made of various types of material. By adjusting the position of the weight along the trough and changing the loading ring, the club head's center of gravity could be adjusted to suit a golfer's specific stance, habit, and the specific trajectory required.

1 . A weight adjustable golf club head comprising: 
 a trough located at a lower part in the back of said club head; and    a weight positioned inside said trough,    wherein said trough is arranged to follow the curvature of said club head's bottom edge, said trough has an inverted T cross-sectional shape with a tapered trough mouth, a narrow neck, and a trough base having a width larger than said neck, an insertion hole having an aperture larger than the diameter of said weight is at a position on said trough through which said weight could be inserted into said trough, said weight comprises a seat, a bolt, and a loading ring, said seat has a locking rim at one end and a positioning rim around the middle of said seat, said locking rim and said positioning rim are inside said trough base and said trough mouth respectively when said weight is slid into said trough, said seat has its inner surface shrinks to form a tapered bulge at an end where said locking rim is located, said locking rim and said seat's body between said locking rim and said positioning rim have a plurality of breaks so as to allow said locking rim to stretch outward and retract inward, said seat has female threads along the inner surface at another end opposite to said locking rim, said bolt has a circular bolt head at one end and male threads at the other half of the bolt opposite to said bolt head, said bolt is screwed into said seat, said bolt has a pointed end pushing against said bulge and stretching said locking rim outward so as to lock said weight to said trough, said loading rim is put around said seat and is fixed between said positioning rim and said bolt head.    
   
   
       2 . The weight adjustable golf club head according to  claim 1 , wherein said bolt has a length longer than that of said seat so that, when said bolt is screwed into said seat, said bolt's pointed end extends out of said seat and pushes against said trough base's bottom, which locks said weight in said trough.  
   
   
       3 . The weight adjustable golf club head according to  claim 1 , wherein a plurality of weights are inserted in said trough.