1936results about "Stringed rackets" patented technology

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.

This invention is directed to tissue engineered prostheses made from processed tissue matrices derived from native tissues that are biocompatible with the patient or host in which they are implanted. When implanted into a mammalian host, these prostheses can serve as a functioning repair, augmentation, or replacement body part or tissue structure.

A hollow golf club head comprises a face portion whose front face defines a club face for striking a golf ball, a sole portion intersecting the club face at the lower edge thereof, at least one groove being provided on an outer surface of the sole portion, the groove extending in a v-shaped formation whose corner portion is smoothly bended and protrudes toward a leading edge of the head, the groove having a ratio (W/L) of a length w in its front-rear direction to a length L in its toe-heel direction being from 0.20 to 1.50 at least partially, and a distance between the leading edge and the corner of the groove being in the range. of from 5 to 30 mm in the front-rear direction.

A golf club head includes a face portion disposed on a front face of a golf club head for hitting a golf ball and a sole portion formed on a lower portion of the golf club head. The sole portion includes a recessed deformation portion. The deformation portion includes a deformation-starting section, a deformation-ending section, and a maximum deformation section between the deformation-starting section and the deformation-ending section. A thickness of the deformation-starting section and a thickness of the deformation-ending section decrease toward the maximum deformation section so that the maximum deformation section has the smallest thickness allowing elastic deformation, thereby increasing elastic deforming capability of the sole portion.

A golf club head (20) having optimized ball speed robustness is disclosed. The golf club head (20) preferably has one or more channels (100, 110, 120) disposed proximate to a striking face (40), and in some embodiments the one or more channels (100, 110, 120) substantially encircle the striking face (40).

A hollow golf club incorporating a stress reducing feature including an aperture located on the crown or sole of the club head. The location and size of the stress reducing feature and aperture, and their relationship to one another, play a significant role in selectively increasing deflection of the face.