Abstract: A twisted tennis racket frame includes a handle, two supporting arms having outside surfaces facing reverse directions, and an annular-shaped head provided on an imaginary plane with large and small arc portions. The large arc portion has an external arc surface, which composes a continuous curved surface with the outside surfaces of the two supporting arms. The continuous curved surface has at least one twisted section having a starting end located at the large arc portion and faces toward a first facing direction that is situated on the imaginary plane, and a terminal end connected with the handle and faces toward a second facing direction. The included angle between the first and second facing directions is larger than 0 degree and not larger than 180 degrees. As a result, the racket performs well in controlling the ball and enables the user to turn the hitting surface quickly.

Abstract: A shock-absorbing seat post for a bicycle includes a connecting mount, a rod member, a shock-absorbing member and a fastening unit. The connecting mount has two connecting lugs each having a first through hole, and a receiving space defined between the two connecting lugs. The rod member has a connecting insert received in the receiving space and provided with a second through hole aligned with the two first through holes. The shock-absorbing member has two lateral walls, a tube portion located between the two lateral walls and provided with an axial hole aligned with the two first though holes. The fastening unit is inserted in the two first through holes, the second through hole and the axial hole for combining the connecting mount, the rod member and the shock-absorbing member together.

Abstract: A shock-absorbing seat post for a bicycle includes a connecting mount, a rod member, a shock-absorbing member and a fastening unit. The connecting mount has two connecting lugs each having a first through hole, and a receiving space defined between the two connecting lugs. The rod member has a connecting insert received in the receiving space and provided with a second through hole aligned with the two first through holes: The shock-absorbing member has two lateral walls, a tube portion located between the two lateral walls and provided with an axial hole aligned with the two first though holes. The fastening unit is inserted in the two first through holes, the second through hole and the axial hole for combining the connecting mount, the rod member and the shock-absorbing member together.

Abstract: A shock-absorbing seat stay for a bicycle includes a seat tube coupler having two branches each having a first joint portion, two extended parts each having a second joint portion corresponding to one of the first joint portions, two shock-absorption members made of elastic materials and each held between the corresponsive first and second joint portions, and at least two fastener units. Each of the first joint portions has at least one first through hole. Each of the second joint portions has at least one second through hole. Each of the shock-absorption members includes at least one third through hole. Each of the at least two fastener units is mounted to one set of the at least one first, second, and third through holes to further interconnect the corresponsive first joint portion, second joint portion, and shock-absorption member.

Abstract: A shock-absorbing seat stay for a bicycle includes a seat tube connecting mount having a first coupling portion with a first through hole, an extension member, a shock-absorbing member and a fastening unit. The extension member has a second coupling portion with two connecting lugs each having a second through hole in alignment with the first through hole. The shock-absorbing member is made of elastic material and clamped between the first and second coupling portions. The shock-absorbing member is a U-shaped member having two arms each having a third through hole. The fastening unit is inserted in the first through hole, the second though holes and the third through holes to connect the first coupling portion, the second coupling portion and the shock-absorbing member together. The seat stay is light weight and has a proper shock-absorbing function.

Abstract: A shock-absorbing seat stay for a bicycle includes a seat tube connecting mount having a first coupling portion with a first through hole, an extension member, a shock-absorbing member and a fastening unit. The extension member has a second coupling portion with two connecting lugs each having a second through hole in alignment with the first through hole. The shock-absorbing member is made of elastic material and clamped between the first and second coupling portions. The shock-absorbing member is a U-shaped member having two arms each having a third through hole. The fastening unit is inserted in the first through hole, the second though holes and the third through holes to connect the first coupling portion, the second coupling portion and the shock-absorbing member together. The seat stay is light weight and has a proper shock-absorbing function.

Abstract: A weighting device for use with a racket includes at least one frame strip, at least one weight, and at least one screw. The frame strip is adapted for being mounted on an outer circumference of a racket frame and has a dovetail groove extending along a longitudinal direction thereof, and a plurality of through holes provided at a bottom wall of the dovetail groove. The weight has a threaded through hole and is slidably engaged in the dovetail groove. The screw is threadedly engaged with the threaded through hole of the weight and provided with an end stoppable against the bottom wall of the dovetail groove for holding the weight stationarily. Therefore, the weight can be firmly positioned and the balance of a racket using the weighting device can be quickly adjusted by adjusting the position of the weight.

Abstract: A shock-absorbable bicycle frame includes a tubular member formed of an internal tube and an external tube sleeved onto at least one part of the internal tube. None of any gap is formed between the internal and external tubes. The internal tube is made of fiber reinforced thermosetting plastic. The external tube is made of fiber reinforced thermoplastic plastic. The method of manufacturing the shock-absorbable bicycle frame includes the steps of putting a fiber fabric impregnated with thermoplastic resin into a mold and heating it up to 230-250° C. to form an external tube, and inserting a fiber fabric impregnated with thermosetting resin into the external tube and heating it up to 140-160° C. to form an internal tube inside the external tube. In light of this, the bicycle frame is not only lightweight and preferably shock-absorbable but simple in fabrication with high yield rate.

Abstract: A shock-absorbing seat stay for a bicycle includes a seat tube coupler having two branches each having a first joint portion, two extended parts each having a second joint portion corresponding to one of the first joint portions, two shock-absorption members made of elastic materials and each held between the corresponsive first and second joint portions, and at least two fastener units. Each of the first joint portions has at least one first through hole. Each of the second joint portions has at least one second through hole. Each of the shock-absorption members includes at least one third through hole. Each of the at least two fastener units is mounted to one set of the at least one first, second, and third through holes to further interconnect the corresponsive first joint portion, second joint portion, and shock-absorption member.

Abstract: A racket capable of being changed in its weight includes handle, a main body, at least one nut embedded in the main body, and at least one bolt threadedly engaged with the nut. The main body has a frame and a connection portion connected between the frame and the handle. Because bolts having different weights can be selectively used to be threaded into the nuts, the user can adjust the overall weight of the racket according to his/her need so as to have a suitable racket.

Abstract: A weighting device for use with a racket includes at least one frame strip, at least one weight, and at least one screw. The frame strip is adapted for being mounted on an outer circumference of a racket frame and has a dovetail groove extending along a longitudinal direction thereof, and a plurality of through holes provided at a bottom wall of the dovetail groove. The weight has a threaded through hole and is slidably engaged in the dovetail groove. The screw is threadedly engaged with the threaded through hole of the weight and provided with an end stoppable against the bottom wall of the dovetail groove for holding the weight stationarily. Therefore, the weight can be firmly positioned and the balance of a racket using the weighting device can be quickly adjusted by adjusting the position of the weight.

Abstract: A racket includes a main body, a replaceable grip sleeve, a nut and a bolt. The main body has a frame, a handle having at least one hole, and a bridge connected between the frame and the handle. The replaceable grip sleeve is sleeved onto the handle and provided with at least one through hole aimed at the hole of the handle. The bolt is inserted through the through hole of the replaceable grip sleeve and screwingly engaged with the nut disposed in the hole of the handle. The user can replace the replaceable grip sleeve of a predetermined size to meet his/her need.

Abstract: A reinforced bicycle frame is made from a fiber-reinforced material. The reinforced bicycle frame includes a head tube, a top tube extending from the head tube, a down tube extending from the head tube beneath the top tube, and at least one rib. The insides of the head, top and down tubes are communicated with each other in a way that the head, top and down tubes combinedly form a frame head having an inner surface defining a chamber. The rib has a connection end connected with the inner surface of the frame head and a free end located in the chamber, thereby enhancing the structural strength of the bicycle frame.

Abstract: A reinforced bicycle frame is made from a fiber-reinforced material. The reinforced bicycle frame includes a bottom bracket shell, a seat tube upwardly extending from the bottom bracket shell, a down tube forwardly extending from the bottom bracket shell, two chain stays backwardly and respectively extending from the bottom bracket shell, and a rib. The bottom bracket shell has a periphery wall defining a chamber and having two opposite lateral sides, each of which is provided with a round tube portion. The rib extends toward the round tube portions from one of a first junction between the seat tube and the down tube and a second junction between the seat tube and the chain stays so as to enhance the structural rigidity of the bottom bracket shell.

Abstract: A racket includes a main body, a replaceable grip sleeve, a nut and a bolt. The main body has a frame, a handle having at least one hole, and a bridge connected between the frame and the handle. The replaceable grip sleeve is sleeved onto the handle and provided with at least one through hole aimed at the hole of the handle. The bolt is inserted through the through hole of the replaceable grip sleeve and screwingly engaged with the nut disposed in the hole of the handle. The user can replace the replaceable grip sleeve of a predetermined size to meet his/her need.

Abstract: A racket capable of being changed in its weight includes handle, a main body, at least one nut embedded in the main body, and at least one bolt threadedly engaged with the nut. The main body has a frame and a connection portion connected between the frame and the handle. Because bolts having different weights can be selectively used to be threaded into the nuts, the user can adjust the overall weight of the racket according to his/her need so as to have a suitable racket.

Abstract: A process of making a base of a shock-absorbing front fork for a bicycle, includes the steps of winding pre-pregs around an upper section of each of two cured straight tubes to form a bridge having a foamed core therein, and placing the two straight tubes and the bridge in a mold and heating the mold for curing the bridge such that the bridge and the straight tubes are connected integrally.

Abstract: A bicycle front fork includes an upright tube and an inverted U-shaped body having a crown and two blades downwardly and respectively extending from two ends of the crown. The crown includes a top wall through which the upright tube penetrates, a bottom wall abuttedly connected with a bottom end of the upright tube, a front wall connected between the top wall and the bottom wall and spaced from the upright tube, and a rear wall connected between the top wall and the bottom wall and spaced from the upright tube. The blades each have a tubular shape with an intermediate rib therein. By this way, the amount of fiber fabric prepreg used at the joint between the upright tube and the inverted U-shaped body for structure reinforcement can be reduced, such that the bicycle front fork is light in weight and strong in structural strength.