A golf club head, including a metallic body, a composite panel affixed to the metallic body, the composite panel having a substantially constant thickness, and a composite stiffening member affixed to the composite panel, the composite stiffening member extending into the interior cavity, wherein the composite stiffening member height is at least twice the composite stiffening member width and wherein the composite stiffening member length is at least five times the composite stiffening member height, wherein the composite panel comprises a thermoplastic composite.

A paddle racket, including: a frame body, including a frame wall and a handle connected with the frame wall, the frame wall defining a receiving space; a three-dimensional web core, disposed in the receiving space and circumferentially connected to the frame wall, including a plurality of channels disposed through the three-dimensional web core in a thickness direction of the three-dimensional web core; and two striking surface portions, disposed on two opposing sides of the three-dimensional web core and connected to the frame wall, each of the two striking surface portions including a plurality of through holes, the plurality of through holes corresponding to and being in communication with the plurality of channels.

Methods of applying a polymeric coating to a rear face surface of golf club heads with variable face thickness are disclosed herein. The coating, which preferably comprises polyurea, improves the durability of the face and reduces the hits to failure ratio of the golf club head. The coating improves the performance of the golf club head because it allows for reduction in overall face thickness and easy post-process manipulation to allow for fine-tuning of mass properties after production. The reduction in thickness leads to overall weight reduction, because the polymer is roughly a quarter of the density of titanium or stainless steel, and also reinforces the face, thereby increasing the lifespan of the club.

A grommet of a racket includes a tubular part. The tubular part includes a through hole through which a string is passed. The through hole includes a base opening, a side wall, and a non-circular tip opening. Assuming an imaginary dividing plane that is perpendicular to a face of the racket and that divides the non-circular tip opening into a first opening portion and a second opening portion shorter than the first opening portion in a direction parallel to the face, an inside dimension of the first opening portion in the direction perpendicular to the face increases gradually from one end of the non-circular tip opening in the direction parallel to the face to the dividing plane. In the tubular part, the string passes through the first opening portion and is in contact with the side wall from the base opening to the tip opening.

In one embodiment the golf club head includes three main components, a frame component, a rear cap component, and a striking plate. In another embodiment the club head may also comprise a front component, which is manufactured as a single unitary piece, and a rear cap component. The front component may also be overmolded by a thermoplastic polymeric outer portion which may or may not cover the striking face and which provides additional reinforcement at the load bearing sections of the club head and allows a more facile connection to the rear cap component. In another embodiment, a club head having a main body, crown insert, sole insert and metal face plate frame is formed by forming the sole insert and crown insert from a polymeric material using a thermoforming or thermosetting process and then injection molding the main body over the sole insert, crown insert and metal face plate frame.

The present invention generally relates to golf bags having a lightweight and durable top frame can be made of a lightweight metal and can have different structures. For example, the top frame can have sidewall, open loop, closed loop, or other configurations. The lightweight top frame assembly can have handle and leg sub-assemblies. Three-dimensional printing methods can be used to form structures in the top frame having various shapes and geometric patterns, for example lattice having a top frame (cuff) with club dividers. The walls of the top cuff can be made of a lightweight metal and can have a sidewall, open loop, closed loop, or other structure. The top cuff includes club dividers for storing and organizing the clubs in different compartments. The club dividers can be made of a cord material. The golf bag of this invention is durable, lightweight, comfortable to carry, and easy to use. The golf bag is durable enough to carry clubs, balls, and accessories, and yet, at the same time, the bag is lightweight and flexible. The golfer is able to balance this lightweight bag and distribute the weight of the bag evenly on their shoulders.

Described herein are embodiments of golf club heads having a balance of the following parameters: a low and back club head center of gravity position, a high moment of inertia, a large Ixy product of inertia, and low aerodynamic drag. Methods of manufacturing the embodiments of golf club heads having a balance of club head center of gravity position, moment of inertia, product of inertia, and aerodynamic drag are also described herein.

Disclosed herein is an iron-type golf club head that comprises a body, made of a first material having a first density. The iron-type golf club head also comprises a weight located within the internal cavity. The iron-type golf club head further comprises a filler material that has a density no less than 0.21 g/cc. The filler material has a mass no less than 2.5 grams and no more than 8 grams. The internal cavity has an internal cavity volume ranging between 5 cc to 20 cc. A ratio of the internal cavity volume to external club head volume ranges between 0.14 and 0.385. The internal cavity has a minimum front-to-back depth above a midplane of the golf club head of no less than 1.4 mm and a maximum front-to-back depth of the internal cavity above the midplane of the golf club head is no more than 13 mm.

The present invention generally relates to golf bags having a lightweight and durable top frame can be made of a lightweight metal and can have different structures. The lightweight top frame assembly can have handle and leg sub-assemblies. Three-dimensional printing methods can be used to form structures in the top frame having various shapes and geometric patterns, for example, a lattice having a top frame (cuff) with club dividers. The walls of the top cuff can be made of a lightweight metal and can have a sidewall, open loop, closed loop, or other structure. The top cuff includes club dividers for storing and organizing clubs in different compartments. The club dividers can be made of a cord material.

The present disclosure discloses a fiber structure, including a plurality of fiber layers. The plurality of the fiber layers are stacked and arranged in a surrounding manner and are impregnated and cured in sequence. The fiber structure of the present disclosure is high in structural strength and low in mass. The present disclosure further provides a gymnastic apparatus force bearing frame, including the above-mentioned fiber structure, which is beneficial to reducing the weight of the gymnastic apparatus force bearing frame, facilitating the movement, transportation, disassembling, and assembling of the apparatus, and reducing the labor burden of an operator.