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.

The disclosed head-mounted device may include a frame, a temple, at least one cable communicatively coupled to the temple and the frame, and a hinge assembly coupling the temple to the frame. The hinge assembly may include (1) a stationary member coupled to the frame, (2) a rotary member coupled to the temple and rotatable with respect to the stationary member about a rotational axis, (3) a wiring passage defined within the stationary member and the rotary member, the wiring passage surrounding and extending along the rotational axis and configured to accommodate at least one cable passing therethrough, and (4) a biasing member positioned to apply a biasing force to hold the rotary member in one of a plurality of selected orientations relative to the stationary member. Various other devices, assemblies, systems, and methods are also disclosed.

One object is to provide a magnetic fluid sealing device in which a magnetic fluid retained between a polar plate and a drive portion can be effectively prevented from spilling, so as to retain waterproofness for a long period. A magnetic fluid sealing device of the present invention includes a ring-shaped polar plate encircling a drive portion and retaining a magnet; and a magnetic fluid retained in a gap between the drive portion and the polar plate by a magnetic force of the magnet. The polar plate has a spill preventing portion provided thereon, the spill preventing portion having a projecting wall that is disposed distant from an end surface of the polar plate retaining the magnetic fluid, so as to prevent spill of the magnetic fluid.

One object is to provide a magnetic fluid sealing device in which a magnetic fluid retained between a polar plate and a drive portion can be effectively prevented from spilling, so as to retain waterproofness for a long period. A magnetic fluid sealing device of the present invention includes a ring-shaped polar plate encircling a drive portion and retaining a magnet and a magnetic fluid retained in a gap between the drive portion and the polar plate by a magnetic force of the magnet. The polar plate has a spill preventing portion provided thereon, the spill preventing portion having a projecting wall that is disposed distant from an end surface of the polar plate retaining the magnetic fluid, so as to prevent spill of the magnetic fluid.

A multi-axis manipulator in the form of a robotic arm includes a safety disc (41) and safety collar (42) at one or more of the pivoting joints (14, 17, 19, 21, 23) thereof. The disc and collar define a small running clearance in normal use, but make contact in the event of excessive wear or failure of the rotary bearing at the respective joint. An inspection window (48) permits the running clearance to be checked, and the collar may comprise a caliper brake.

A structure generally comprising a support structure with a rotating form is disclosed. The support structure may be an upright tube or other shape, and the rotating form may be a ring or other shape configured with the tube. Holes may be in the outer circumference of the tube and in the inner circumference of the opening of the ring. Pressurized air may pass into the tube and out its holes, and then into the ring. In this way, the air may apply a lift to the ring and may minimize friction between the tube and the ring, thus allowing it to rotate freely.

A pivot device for exercise equipment. The pivot device has a first hub for a first movable member of the exercise equipment, and a second hub for a second movable member of the exercise equipment. The first hub and the second hub are pivotable relative to each other about a pivot axis through a pivot range. A dampener is configured to dampen said pivoting movement, wherein the dampener has a resilient bumper having an annular shape which is compressed at the first end of said pivot range.

The present invention relates to a medical aid or sports aid (100), comprising a Bowden cable (10, 40), wherein the Bowden cable (10, 40) comprises a core (11, 41), wherein the core (11, 41) runs at least in a partial region in a casing (12, 42), wherein the casing (12, 42) is stretchable at least in a partial region, and the use of a Bowden cable (10, 40), having a core (11, 41) for tensioning a medical aid or a sports aid (100), wherein the core (11, 41) runs at least partially displaceably in a casing (12, 42) and the casing (12, 42) is stretchable.

A rotating assembly and a movable puzzle platform using the same are disclosed in present invention. The movable puzzle platform includes a board assembly having a puzzle board, a kickstand pivotally coupled at the board assembly and the rotating assembly attached on the kickstand and having a first moving member, a second moving member rotatably coupled to the first moving member for forming a holding space and a plurality of ball bearings rotatably received in the holding space for allowing the second moving member rotating with respect to the first moving member. One end of the kickstand is pivotally coupled at the board assembly while a free end of the kickstand is adapted to pivotally fold from the board assembly.

The present invention is directed to devices for protection of the bottom center portion of skateboard platforms when used obliquely on upstanding structural edges, as when grinding. A roller assembly of the present invention may have an elongated bearing shaft rotatably positioned at each end in spaced apart bearings that are attached to the bottom surface of a skateboard platform. Optional variations and surface treatments of the bearing shaft are also disclosed.