Embodiments of a co-molded putter-type golf club head comprising a high-density chassis made of a first material and a low-density putter-type body made of a second material. The first material can be a high density metal (i.e., steel or tungsten, but not limited to). The second material can be a low density thermoplastic composite (i.e., polyphenylene sulfide (PPS), polyamide (PA), but not limited to). The chassis comprises a flow aperture, and one or more interlocking features. The putter-type body portion encases the entirety of the at least one interlocking feature. Further, the putter-type body encapsulates the chassis such that the body extends through, and completely fills the flow aperture, to interlock the body and chassis, and thus form the club head. Other embodiments may be described and claimed.

The present invention relates to a ball game racket frame with a head portion and a handle portion, wherein the ball game racket frame comprises a fiber composite with at least one multi-fiber roving that is at least partially twisted.

A golf club includes a face coupled to a body. A composite axis extends from a heel to a toe of the club and parallel to ground. The face is formed of a fiber composite material including at least first and second sets of ply arrangements. Each of the ply arrangements includes a pair of plies having first and second pluralities of fibers defining first and second angles with respect to the composite axis, respectively. The face has a ball contact surface, an rear surface, and a mid-zone positioned equidistant between the contact and rear surfaces. A majority of the first and second pluralities of fibers of the ply arrangements between the mid-zone and the contact surface are formed of glass fibers, and a majority of the first and second pluralities of ply arrangements between the mid-zone and the rear surface are formed of carbon fibers.

Embodiments of a co-molded putter-type golf club head comprising a high-density chassis made of a first material and a low-density putter-type body made of a second material. The first material can be a high density metal (i.e., steel or tungsten, but not limited to). The second material can be a low density thermoplastic composite (i.e., polyphenylene sulfide (PPS), polyamide (PA), but not limited to). The chassis comprises a flow aperture, and one or more interlocking features. The putter-type body portion encases the entirety of the at least one interlocking feature. Further, the putter-type body encapsulates the chassis such that the body extends through, and completely fills the flow aperture, to interlock the body and chassis, and thus form the club head. Other embodiments may be described and claimed.

Embodiments of a co-molded putter-type golf club head comprising a high-density chassis made of a first material and a low-density putter-type body made of a second material. The first material can be a high density metal (i.e., steel or tungsten, but not limited to). The second material can be a low density thermoplastic composite (i.e., polyphenylene sulfide (PPS), polyamide (PA), but not limited to). The chassis comprises a flow aperture, and one or more interlocking features. The putter-type body portion encases the entirety of the at least one interlocking feature. Further, the putter-type body encapsulates the chassis such that the body extends through, and completely fills the flow aperture, to interlock the body and chassis, and thus form the club head. Other embodiments may be described and claimed.

A trampoline has a side frame supported by support legs, multiple fiberglass guardrail poles joined to the side frame or the support legs, and a guardrail netting held open by the guardrail poles. Each guardrail pole includes two fiberglass rods joined together by a connector that includes two nested securing tubes, where two respective ends of the two fiberglass rods are inserted in the internal securing tube. The external securing tube is secured outside of the internal securing tube. The guardrail netting has multiple securing fabric sleeves stitched to its top end. Each sleeve has a first part with a sealed top and a width matching that of a wider top section of the fiberglass guardrail pole, and a second part connected to the first part with a width matching that of the fiberglass guardrail pole, where the second part has a gap in the middle.

The present invention relates to a ball game racket frame with a head portion and a handle portion, wherein the ball game racket frame comprises a fiber composite with at least one multi-fiber roving that is at least partially twisted.

A trampoline has a side frame supported by support legs, multiple fiberglass guardrail poles joined to the side frame or the support legs, and a guardrail netting held open by the guardrail poles. Each guardrail pole includes two fiberglass rods joined together by a connector that includes two nested securing tubes, where two respective ends of the two fiberglass rods are inserted in the internal securing tube. The external securing tube is secured outside of the internal securing tube. The guardrail netting has multiple securing fabric sleeves stitched to its top end. Each sleeve has a first part with a sealed top and a width matching that of a wider top section of the fiberglass guardrail pole, and a second part connected to the first part with a width matching that of the fiberglass guardrail pole, where the second part has a gap in the middle.

Embodiments of a co-molded putter-type golf club head comprising a high-density chassis made of a first material and a low-density putter-type body made of a second material. The first material can be a high density metal (i.e., steel or tungsten, but not limited to). The second material can be a low density thermoplastic composite (i.e., polyphenylene sulfide (PPS), polyamide (PA), but not limited to). The chassis comprises a flow aperture, and one or more interlocking features. The putter-type body portion encases the entirety of the at least one interlocking feature. Further, the putter-type body encapsulates the chassis such that the body extends through, and completely fills the flow aperture, to interlock the body and chassis, and thus form the club head. Other embodiments may be described and claimed.

One object is to provide a golf club equipped with a shaft made of FRP, the golf club being excellent in swing feeling and ball-hitting feeling and capable of stabilizing directional accuracy in ball hitting. The golf club according to the present invention is characterized in that it includes a shaft made of a fiber-reinforced resin mounted to a head, and the shaft is formed so that a variation of a ratio between torsional rigidity and bending rigidity (GIp/EI) is 0.2 or less over an entire length thereof.