Abstract:
A method for forming a fiber-reinforced composite structure comprising the steps of: a) providing at least one preform (10) comprising at least one first ply (14) and at least one subsequent ply (12) wherein each of said plies (12, 14) comprises a thermoset and/or thermoplastic resin matrix and fibers and wherein the direction of the fibers in said first ply (14) is different from the direction of the fibers in said subsequent ply (12); b) helically winding said preform (10) around a mandrel (20) from a first end region (21) of the mandrel to a second end region (23) of the mandrel and/or from said second end region (23) to said first end region (21), such that the direction of the fibers in the first ply (14) is orientated relative to an axial direction (X) defined by the mandrel (20) so as to improve a certain performance; c) as an alternative to step b), helically winding at least two preforms (10a, 10b) around the mandrel (20) from said first end region of the mandrel to said second end region of the mandrel, one (10b) of said preforms being wound clockwise and the other (10a) of said preforms being wound counterclockwise, such that the direction of the fibers in a ply of at least one of said preforms is orientated relative to the axial direction (X) defined by the mandrel (20) so as to improve a certain performance; d) repeating steps b) or c) until the successive windings of the preform (10) define a specific three-dimensional structure; e) compacting with pressure said specific three-dimensional structure; f) consolidating said specific three-dimensional structure through the application of a heating cycle as required by the resin systems.
Abstract:
A component comprises a hollow component having a plurality of prepreg layers, where each prepreg layer includes a graphene-resin mixture comprising a resin and a graphene preparation evenly disposed throughout the resin. The component further includes a fiber cloth impregnated with the graphene-resin mixture. The plurality of prepreg layers are applied and pressed together in alternate layers of graphene-resin mixture and fiber cloth to form the hollow component.
Abstract:
The golf teaching set in the form of a subconscious habit based on established experience contains a special golf training club no. 0, a swing trainer for learning the position of the striking area at the moment of impact and training golf balls. Training golf club no. 0 has zero loft and the plane of the striking area is reflected in the club's grip. The swing trainer serves to develop the ability to perceive the position of the striking area at the moment of impact. It is used together with training club no. 0, where a pupil tries to achieve clean contact, i.e. under an angle of 0°, between the striking area and the area of the flexible panel.
Abstract:
Provided are tubular carbon fiber reinforced composite material and having excellent cylindrical bending strength and a golf club shaft using the same. This tubular carbon fiber reinforced composite material is formed by laminating and curing a straight layer and a bias layer. The straight layer comprises carbon fibers S coated with a sizing agent S and arranged in parallel in a direction of -20° to +20° with respect to the axis of the tubular body, and contains a thermosetting resin S. The bias layer comprises carbon fibers B coated with a sizing agent B and arranged in parallel in a direction of +25° to +65° with respect to the axis of the tubular body, and contains a thermosetting resin B. The carbon fiber reinforced composite material constituting the bias layer has an interlaminar shear strength of not less than 110 MPa. A cured product of the thermosetting resin S has an elastic modulus of not less than 4.0 GPa.
Abstract:
The present invention relates to a racket, comprising a head region, a striking region, a throat region, a shaft region, a handle region, and a shear thickening material in the striking region, the shear thickening material being configured to exhibit shear thickening behavior when an impact occurs between the racket and an object.
Abstract:
A golf club shaft which satisfies strength and is lightweight is provided by the present invention. This golf club shaft comprises one or more fiber-reinforced resin layers, and is characterized by satisfying the following relationship (1), wherein x [mm] is the displacement in a cantilever bending test, M [g] is the mass of the golf club shaft, and L [mm] is the length thereof, and by satisfying the following strength standard values [1]-[4]: M×(L/1168) -0.0015x (relationship 1); [1] the three-point bending strength at T-90 (the position 90 mm apart from the smaller-diameter end) is 800 N or higher; [2] the three-point bending strength at T-175 (the position 175 mm apart from the smaller-diameter end) is 400 N or higher; [3] the three-point bending strength at T-525 (the position 525 mm apart from the smaller-diameter end) is 400 N or higher; and [4] the three-point bending strength at B-175 (the position 175 mm apart from the larger-diameter end) is 400 N or higher.
Abstract:
A golf club with a golf club head having one or more adjustable weights is presented. The club head may include a club head body having a recessed formed therein. In some arrangements, the recess may be formed in a sole portion of the club head body. The golf club head further includes an adjustable weight that may be rotated from a first position to a second position to adjust the weight characteristics, and thus the performance characteristics of the golf club. In some arrangements, the adjustable weight and/or any hardware, fasteners, etc. associated with the adjustable weight may be constantly connected to the golf club head such that adjustment of the weight does not include removal of the weight and/or any hardware, fasteners, etc.
Abstract:
A temporary shaft-component connection for assembling a selected golf club shaft with a club head and/or hand grip segment, to facilitate custom club design and fitting to suit the needs and preferences of an individual golfer. The temporary shaft-component connection is particularly designed for use with nonmetallic club shafts formed from a graphite-based composite material or the like having a range of different lengths and stiffness (whip) characteristics. In a shaft-head connection, a metal adapter insert is mounted onto a lower end of the club shaft and includes one or more flat surfaces for reception into a matingly shaped socket in the hosel of a selected club head to prevent relative rotation between the club shaft and head. A compression nut carried on the shaft is threaded onto the hosel to axially engage and retain a thrust flange on the shaft or adapter or adapter insert, to prevent axial separation of the club head and shaft.
Abstract:
A precise impact and increased ball drive distance may be achieved due to an increase of elastic force and restoring force of a golf club shaft, when the golf club shaft includes: a first shell portion interiorly disposed in the golf club shaft; at least one elastic member disposed in a length direction on an exterior circumference of the first shell portion; and a second shell portion including carbon and enclosing the first shell portion and the at least one member.
Abstract:
A hand-operated stick device (10) includes a gripping portion (14), a working member (16) and an elongated shaft (12) with opposite ends connecting the gripping portion (14) and the working member (16). The shaft (12) has a wall thickness (T) and at least three ribs (13) projected from an inner side (12c) of the shaft (12). The ribs (13) extend from an end of the shaft (12) adjacent to the gripping portion (14) to the other end adjacent to the working member (16). The ribs (13) have a width (W) and a height (H) both of which are greater than or equal to the wall thickness (T). Therefore, it may increase the strength of structure and provide a safe use.