The present invention provides a stud and tool to remove the same.

A removable stud, tool for inserting and removing the stud and kits comprising the studs and tool are provided. The removable stud comprises a hexagonal head portion connected to a threaded pointed shank portion. The hexagonal head portion includes a notched flange portion that has two diametrically opposed notches that are each centered on a vertex of the hexagonal head. The tool includes a wrench head comprising a neck with two substantially diametrically opposed walls extended therefrom. Each wall has an interior face configured to receive a vertex of the hexagonal head of the stud and a tip portion configured for the notch of the stud.

The present invention provides a stud and tool to remove the same.

A stud unit (3) and a device (1) for a studded tire. The stud unit comprises a housing (5) with a chamber (7) enclosing a medium, a stud (20) arranged at least partly inserted into the chamber so that it is affected by the medium. The stud is adapted to be moved depending on a change of the pressure of the medium in the chamber between a first position for a first pressure and a second position, where the second pressure is higher than the first pressure. In the second position a part of the stud protrudes further from the chamber than in the first position, The stud unit also contains a heating element (22) adapted to heat the medium so that the pressure in the chamber is adjusted between the first pressure and the second pressure.

The present invention provides a tire with retractable studs. A stud retraction control mechanism can manipulate the protraction or retraction state of a tire stud within the tire. The stud retraction control mechanism may be accessed and controlled by a vehicle user who may decide to retract or protract studs within the tire to suit vehicle use conditions.

The present invention provides a stud and tool to remove the same.

A steel-cleated, all terrain tire has cleats that dynamically engage with changing road conditions, across slick ice and bridges, and while turning, breaking and accelerating on steep terrain. The tire design can provide stability and an enormous safety benefit in dangerous conditions, on demand, without the driver's intervention. The tire design can be used for military vehicles and aircraft, commercial jets, turboprop aircraft, heavy equipment, commercial diesel trucks, helicopters, law enforcement vehicles, fire and rescue vehicles, school buses, government vehicles, sport cars, and the like. The tire design include spring loaded cleats that can are spaced about and extend outward from the tire's surface. The spring load may be strong enough to permit the cleat to penetrate ice and the like, while not damaging asphalt or concrete roadways.

A robot cleaner is disclosed. The robot cleaner according to an embodiment of the present disclosure comprises: a body; a wheel cover; a drive module; and a wheel, wherein the wheel comprises: a wheel body coupled to the drive module and forming the appearance of the wheel; a plurality of tread portions arranged along the circumferential surface of the wheel body and spaced apart from each other; cutout portions formed between the tread portions at the circumferential surface of the wheel body; and a rib member comprising a ring portion received in the wheel body and rib portions protruding radially outward of the wheel from the ring portion through the cutout portions, wherein the rib member comprises an elastic material and is thus provided such that the rib portions are retracted inside the wheel body when a force is applied radially inward of the wheel.