An instructional device for an instructor to use with a student for downhill skiing is disclosed. In use, the instructor skis to the side and behind the student skier. A curved extension member is provided at the end of a shaft and is placed against the student skier's midsection to provide stability and balance for the student. Two student handles can be attached to the extension member. The student handles serve two purposes. The device can be easily converted for use either from the student's right side or left side, depending on the instructor's preference. Second, the student handles can be added as the student progresses to help correctly position the student's hands and develop good posture for the eventual use of ski poles. An instructor handle is located along the shaft. The instructor handle may be adjustable along the length of the shaft.

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.

A ski pole including a sleeve and a snow basket, wherein the upper end of the sleeve is provided with a hook, the snow basket is provided with a sleeve mounting groove, the upper end of the sleeve mounting groove is provided with an engagement groove and a press section, the diameter of the press section is slightly larger than the diameter of the sleeve, the press section drives the engagement groove to deform elastically, the sleeve is installed on the snow basket by inserting the sleeve mounting groove, and the hook is engaged on the engagement groove. The present invention has the following advantageous effects: the installation and disassembly of snow bracket and sleeve do not require professional tools to operate, a user can complete the disassembly and installation of snow bracket with their bare hands, the installation is convenient and quick and it saves time and costs.

The invention is directed to a ski pole comprising a longitudinal shaft. The shaft includes a cross-section that comprises: a first part including a curved first portion arranged symmetric about a cross-sectional centerline (CL) of the shaft, and a second part including a second portion arranged symmetric about the cross-sectional centerline.

Wherein the first part is connected to the second part by side parts including side portions, each side part comprises a first end connected to an end of the first part and a second end connected to an end of the second par, each connection between the side parts and the first and second parts forms a corner, such that there are total four corners in the cross-section of the shaft.

The present disclosure relates to a shaft for athletic activities comprising, along at least a part of the length of the shaft: an internal wall (31) made of a first fiber-reinforced composite; and an external wall (30), fixed to the internal wall, and made of a second fiber-reinforced composite, wherein one or more cavities (32A, 32B, 32C) are present between the internal wall and the external wall.

An apparatus for training a student to ski is a ski pole that, used in a pair and held laterally, converts to guiding harness. The apparatus is configured as a pair arranged around the student and held by both student and instructor. The apparatus converts to typical-use ski poles when training is complete. The apparatus is configured like a typical-use ski pole, but articulated with a ratchet joint that enables arrangement around the student.

A hollow wall composite tube for improving performance in sports shafts and lightweight structural members is disclosed that includes: a constituent tube, for forming the wall, that comprises: a flexible core component, for providing an adjustable shape on which to wind or braid filaments or fabric; and an adjustable shape hollow structure, for reducing weight, providing a path for the core to be evacuated, tightly conformed to the core, and tow, braid filaments or fabric, for providing a reinforcing fiber matrix for saturation with epoxy, spirally wrapped, applied or braided on the constituent tube. Methods of producing contemplated composite tubes are also disclosed.

A detachable snowboard and snowboard pole with a collapsible shaft divided into segments, a basket tip, and a handle. In exemplary embodiments, the pole affixes to a planar top surface of the snowboard using a mounting system comprising a plurality of clamps at staggered attachment points, each clamp adapted to form a friction fit with segments of the snowboard pole, each clamp oriented in parallel with one another.

The invention relates to a hand-retaining device (70) for securing to a pole handle (1), comprising an insert opening (71) for the hand, a first exit opening (72) for the hack of the hand, and a second exit opening (73) for the thumb. The hand-retaining device according to the invention further has a first elastic strip (74) which is led between the thumb and the other fingers and on which a coupling element (79) is provided that can be secured in or on the pole handle in a removable mechanism in a self-latching manner. The invention further relates to a pole handle to which the handle loop according to the invention can be optimally secured.

A leg assembly, and a shock absorption mechanism for a pole are provided. The shock absorption mechanism comprises a pole body and a leg assembly, wherein the leg assembly comprises a support leg, a tray surrounding the support leg, and a connecting sleeve for connecting the pole body inserting from the top of the support leg. When a bottom of the pole body is inserted into the connecting sleeve and tightly resists against the elastic limiting clamps, the elastic limiting clamps will be pushed outward and limited in the guiding slots of the support leg, so that the connecting sleeve with the pole body can move upward and downward relative to the support leg. There is a mounting space for the shock absorption spring between the support leg and the connecting sleeve, and the support leg has a trend of moving downward due to resistance from the shock absorption spring.