The present invention relates to a cart device primarily comprised of a body, at least one wheel, and at least one axle. In one embodiment, the device can be manually pulled using a handle. In another embodiment, the device has a motor that is powered by a battery and can be controlled by a remote such that the device can propel itself. In various embodiments, the wheel of the device can be optimized for various terrain such as sand, wherein said embodiment features a smooth and inflatable wheel. Further, the device is comprised of an umbrella holder that receives an umbrella and allows the device to act as a base for the umbrella. The device is also comprised of a tow hitch and a tow bar that allows the device to be pulled by a secondary vehicle such as, but not limited to, a golf cart.

The disclosure relates to a road noise reducing system including a wheel rim having a barrel, a first layer of acoustic metamaterial with a first plurality of open cells mounted on the barrel, and, optionally, a second layer of acoustic metamaterial with a second plurality of open cells in contact with the first layer of acoustic metamaterial. The system optionally includes a pneumatic tire with a hollow, wherein the tire is mounted on the wheel rim such that the hollow forms a closed cavity and can incorporate additional elements including an elastomeric membrane, a noise-absorbing foam, and/or a resonator. The system has a sound transmission loss of at least 20-35 dB at frequencies of 50 Hz to 2,000 Hz and can reduce tire-road interaction noise by at least 50-70%. Also disclosed are methods of making road noise reducing wheel and tire assemblies, automobiles incorporating the same, and methods for reducing tire-road interaction noise.

A method for controlling the discharge of fluids during a process for vulcanization and moulding of a green tire includes the steps of: building at least one portion of a radially internal surface of a green tire by winding of a continuous elongated element of elastomeric material into a plurality of coils confining circumferential grooves along the rolling direction of the tire; disposing the circumferential grooves into fluid communication with discharge channels present in the radially external surface of a pressing bladder disposed in a radially internal cavity bounded by the green tire.

A method for controlling the discharge of fluids during a process for vulcanization and moulding of a green tire includes the steps of: building at least one portion of a radially internal surface of a green tire by winding of a continuous elongated element of elastomeric material into a plurality of coils confining circumferential grooves along the rolling direction of the tire; disposing the circumferential grooves into fluid communication with discharge channels present in the radially external surface of a pressing bladder disposed in a radially internal cavity bounded by the green tire.

A fuel solution introducing method introduces a fuel solution into a tire. The tire includes a transmitter configured to transmit data that includes a detection result detected by a sensor to a receiver. The transmitter is operated with, as a power source, an organic power generation element configured to generate power through a chemical reaction with organic matter contained in the fuel solution. The fuel solution introducing method includes introducing the fuel solution and gas into the tire from a tire valve arranged on a wheel to which the tire is attached.

A pneumatic tire includes: a tire main body; and at least one sound damper. The sound damper is made of a foam material having a plate shape, a size of one surface of the foam material in a longitudinal direction being smaller than that of the other surface. The sound damper is formed by affixing the foam material to a tire inner cavity surface to form a ring shape, with the other surface of the foam material being toward an outer circumference, and end faces of the foam material in the longitudinal direction abut each other and are bonded.

A pneumatic tire includes: a tire main body; and at least one sound damper. The sound damper is made of a foam material having a plate shape, a size of one surface of the foam material in a longitudinal direction being smaller than that of the other surface. The sound damper is formed by affixing the foam material to a tire inner cavity surface to form a ring shape, with the other surface of the foam material being toward an outer circumference, and end faces of the foam material in the longitudinal direction abut each other and are bonded.

Provided is a pneumatic tire. A sipe includes, on each of a leading side edge and a trailing side edge, a chamfered portion and a non-chamfered region including no other chamfered portion. The maximum depth of the chamfered portion is shallower than the maximum depth of the sipe, and the sipe width is substantially constant. In a cross-sectional view, at least one chamfered portion includes a profile line that is convex inward in a tire radial direction with respect to a chamfer reference line connecting both ends of the chamfered portion; and a cross-sectional area of a chamfered region that is surrounded by the profile line, the sipe, and a tread contact surface of a tread portion is equal to or greater than a cross-sectional area of a reference region, the reference region being surrounded by the chamfer reference line, the sipe, and the tread contact surface.

Provided is a pneumatic tire. A sipe includes, on each of a leading side edge and a trailing side edge, a chamfered portion and a non-chamfered region including no other chamfered portion. The maximum depth of the chamfered portion is shallower than the maximum depth of the sipe, and the sipe width is substantially constant. In a cross-sectional view, at least one chamfered portion includes a profile line that is convex inward in a tire radial direction with respect to a chamfer reference line connecting both ends of the chamfered portion; and a cross-sectional area of a chamfered region that is surrounded by the profile line, the sipe, and a tread contact surface of a tread portion is equal to or greater than a cross-sectional area of a reference region, the reference region being surrounded by the chamfer reference line, the sipe, and the tread contact surface.

A replacement exercise bike tire that will emulate the ride characteristics and effort of a conventional bike tire that is partially deflated. The increased roll resistance imparted by the exercise tire will enhance the bike rider's workout by imparting greater pedal effort required to ride. Multiple interconnected compartments within the tire body are filled with a high viscosity material that will displace under load as the tire rotates during use emulating a flat tire.