A safety walker having a frame with a set of spherical caster wheels connected to the lower portion of the frame to provide omnidirectional movement with reduced force. A braking system is provided, where when a weight exceeding a threshold weight is applied to the frame, the brake is engaged to inhibit movement of the walker on the ground. The brake may use a mechanism in which each spherical caster wheel is retractably mounted within a lower end of a corresponding leg of the frame. Each spherical wheel is spring-loaded to urge the spherical wheel downward from the lower end of the corresponding leg. As weight is applied to the frame, the spherical caster wheel is pushed into the lower end of the leg, allowing the lower end of the leg to contact the ground surface and maintain stationary contact between the leg and the ground surface.

An omnidirectional moving device is provided with a vehicle chassis, a vehicle body, a universal coupling, and an attitude stabilizing system. In the vehicle chassis, a plurality of wheels that are capable of moving omnidirectionally are provided. The vehicle body is mounted on the vehicle chassis. The universal coupling connects the vehicle chassis to the vehicle body, and the attitude of the vehicle body relative to the vehicle chassis can be changed via this universal coupling. The attitude stabilizing system causes the vehicle chassis to move in a direction that corresponds to a change in the attitude of the vehicle body, and maintains the attitude stability of the vehicle body.

The utility model discloses a wheel nut, including a nut body which the outside surface comprises of multiple identical arc surfaces. The arc surface is protruding outward, and the radius of the arc surface is larger than the circumscribed radius of the outside surface of the nut body. The utility model designs the existing square surface of the outer hexagon feature of the wheel nut as an arc surface, which the contact area between the wheel nut and the sleeve and the loading area of the wheel nut can be increased, and then the deformation and looseness of the wheel nut can be avoided effectively, and therefore the service life of the wheel nut can be improved.

A bicycle wheel sensor is provided and includes a housing configured to be at least partially disposed within a tire of a bicycle wheel. The sensor may be mounted opposite a valve stem location to help balance the bicycle wheel. The bicycle wheel sensor has one or more sensors exposed to the inside of the tire and is configured to provide data obtained from within the tire. The sensor includes an electronic control unit that receives the data from the sensors and transmits the data to a user device via a transceiver.

An omnidirectional moving device is provided with a vehicle chassis, a vehicle body, a universal coupling, and an attitude stabilizing system. In the vehicle chassis, a plurality of wheels that are capable of moving omnidirectionally are provided. The vehicle body is mounted on the vehicle chassis. The universal coupling connects the vehicle chassis to the vehicle body, and the attitude of the vehicle body relative to the vehicle chassis can be changed via this universal coupling. The attitude stabilizing system causes the vehicle chassis to move in a direction that corresponds to a change in the attitude of the vehicle body, and maintains the attitude stability of the vehicle body.

A handle-hidden quick-release structure has: an outer shaft lever having a shaft lever external thread on an outer circumferential surface of one end thereof, at least one clamping slot on the other end face thereof and an axially extending receiving hole, wherein a wall of the receiving hole has a step surface; an internally hidden rotating handle having a first rod body and a second rod body, wherein the first rod body is disposed in the receiving hole of the outer shaft lever, a stop portion radially protrudes outwards from the first rod body, the second rod body has a rod body and a rod head, the rod body is disposed in the receiving hole, one end of the rod body is pivoted to the first rod body, the other end of the rod body is connected with the rod head.

In one aspect, a wheel end monitoring apparatus comprising a wheel hub configured to receive a wheel rim and be clamped therewith. The wheel end monitoring apparatus further includes a power source, at least one sensor, and communication circuitry that are rotatable with the wheel hub. The at least one sensor is configured to detect at least one property of the clamped wheel hub and the wheel rim. The at least one property is indicative of the clamping of the clamped wheel hub and the wheel rim. The communication circuitry is configured to wirelessly communicate data associated with the at least one property to an external device.

A hub cap assembly includes a disc having a top surface and a bottom surface. A rim extends from the bottom surface. The hub cap assembly also includes at least one tire stem port disposed on the disc. Moreover, the rim comprises a cavity that receives balance media. In some embodiments, the hub cap assembly further comprises cooling fins, e.g., disposed about a circumference of the top surface. The cooling fins can direct cooling air to a corresponding tire, e.g., to cool a bead of the tire.

A fastener retainer includes at least one fastener cap and a hub. Each fastener cap can include a stop channel that encircles a bottom portion of a housing of the fastener cap, a base with cog members that encircle the housing, or a combination thereof. The hub has at least one port therein, where each port is associated with a corresponding fastener cap. At least one locking member is positioned on the hub. For instance, a locking member can be provided adjacent to each port. In use, each locking member constrains radial movement of a corresponding fastener cap inserted into the associated port, by disposing a projecting member into a space between adjacent cog members on the base of the corresponding fastener cap.

An axle assembly having a fill-check assembly. A fill-check assembly is disposed on the axle housing and may include a fitting, a guard, and a sight glass in fluid communication with a lubricant reservoir via the fitting. The sight glass permits visual inspection of the lubricant in the sight glass.