Coupling device (20) for a vertical pole (8) for gym exercises comprising a hemispherical element (3) positioned inside a seat (22), a base (1), a shaft (5) inserted inside the hemispherical element (3) to which the vertical pole (8) for gym exercises is connected, said device (20) being characterized in that the hemispherical element (3) comprises a plurality of blocking elements (10, 33, 45) configured to be coupled to a plurality of corresponding elements (26, 34, 44), made on the inner surface of the seat (22) of the hemispherical element (3) to prevent the rotation of the pole (8) around an axis (X) passing through the centre of the coupling device (20) while leaving free the oscillatory movement of the pole (8) with respect to said axis (X).

A gondola of a Ferris wheel installation is connected to a wheel rim structure of the Ferris wheel by means of a guide structure comprising at least one bearing that is connected to the wheel rim structure by two sliding ball joints which have slide axes that are parallel to one another and spaced apart from one another.

A magnetic levitation device as a toy or a bearing is provided. The magnetic levitation device has an inner component and an outer component. Multiple magnet rings are mounted on the inner component and multiple magnet rings are mounted on the outer component. The magnet rings on the inner component attract the magnet rings on the outer component. Multiple pulley assemblies are mounted on the outer component. An elastic component is connected with a center pulley. The two ropes are wrapped on the center pulley. One end of each one of the ropes is mounted on one of the fixing points that is connected to one of the magnet rings mounted on the outer component and another one end of the rope is mounted on a reactive pulley. With such structure, the outer component may levitate from the inner component and the pulley assemblies can balance the entire device.

Embodiments of the present disclosure are directed to a roller-skate bearing seat truing tool comprising a plurality of spaced teeth, a first handle, and a second handle. The plurality of spaced teeth may be operable to true up a cylindrical surface of a roller-skate bearing seat and a vertical surface of the roller-skate bearing seat. The first handle may comprise a protrusion longitudinally extending from one end. The second handle may comprise a receptacle at one end configured to slidably receive the protrusion. The plurality of spaced teeth may be disposed about an upper rim of the receptacle, on an upper rim of the first handle, about the protrusion, or both.

A wheel bearing having a cup, a cone and a washer. The cone is of a complementary shape to the cup and the washer abuts a surface of the cone. Each of the cup, the cone and the washer are made from a self-lubricating polymer.

A motor driven omnidirectional treadmill that allows users to walk, jog, or run in any direct ion. When the treadmill is coupled with computer-generated immersive environments users can maneuver their way on-foot through 360-degree VR environments of infinite expanse and scope.

Exercise equipment for weight training includes first, second, third, and fourth guide rods respectively fitted into first, second, third and fourth bearing bodies such that the first, second, third, and fourth bearing bodies slide up and down along the first, second, third, and fourth guide rods, respectively, as weights are lifted up. First and second bearings provided at each of the first, second, third, and fourth bearing bodies are arranged to crisscross each other to closely contact and support the outer surfaces of the first, second, third and fourth guide rods concurrently, thereby dispersing the load of the lifted weights, which facilitate various weight training movements by using a weight training rod, a horizontal bar, and equipment for parallel exercises.

A magnetically-controlled damping device has a fixing disk, a rotating disk, a plurality of friction-proof sleeves, a plurality of brake shoes, a plurality of magnets, an elastic element, and an operating element. The rotating disk has a plurality of guiding rods sleeved by the friction-proof sleeves respectively. By adjusting a distance between the magnets and a rotating wheel, a damping value of the magnetically-controlled damping device can be adjusted. Moreover, since the friction-proof sleeves are between the guiding rods and the guiding grooves, the guiding rods do not wear out. The magnetically-controlled damping device can provide a more stable damping value and a longer service life.

A magnetically-controlled damping device has a fixing disk, a rotating disk, a plurality of friction-proof sleeves, a plurality of moving disks, a plurality of magnets, an elastic element, and an operating element. The rotating disk has a plurality of guiding rods sleeved by the friction-proof sleeves respectively. By adjusting a distance between the magnets and a rotating wheel, a damping value of the magnetically-controlled damping device can be adjusted. Moreover, since the friction-proof sleeves are between the guiding rods and the guiding grooves, the guiding rods do not wear out. The magnetically-controlled damping device can provide a more stable damping value and a longer service life.

The present invention relates to a musical instrument support bar disposed between a musical instrument bottom pole and a musical instrument vertical pole. The musical instrument support bar comprises a holder, a ball head bar and an extension bar, wherein the holder comprises a bottom pole clamp for clamping the musical instrument bottom pole, and a ball type clamp. Two ends of the ball head bar are respectively a ball head end clamped by the ball type clamp, and a columnar end. Two ends of the extension bar are respectively a first end engaging the columnar end and a second end engaging the musical instrument vertical pole. Accordingly, as the universal rotation ability is formed by the ball head end clamped by the ball type clamp, the musical instrument support bar is bent freely so that a bending direction and a bending angle thereof can meet the needs in use.