A vehicle can include a base assembly, a rack assembly, and a processing system. The base assembly can include a platform, a plurality of wheels and a motor for driving at least one of the plurality of wheels. The rack assembly can include a storage shelf connected to the base assembly through a coupling, which includes a bearing assembly enabling the storage shelf to rotate with respect to the platform. The processing system can be configured to communicatively couple with the rack assembly and include one or more processors configured to: determine a location of a target good; cause the storage shelf to move based on the determined location.

A castor structure includes a wheel support unit, an operation unit, a locking member, a directional member, a directional brake member, a bent elastic bar, and two resting members. The operation unit includes a drive shank formed with an annular groove which has an upper tapered face and a lower tapered face. The locking member includes a plurality of locking teeth. The directional brake member includes a plurality of directional toothed grooves. The elastic bar extends through the directional member and the annular groove. Thus, the elastic bar is stretched outward by the annular groove of the drive shank when the drive shank is moved downward, to provide a micro-adjustment effect, such that the directional toothed grooves of the directional brake member align with and exactly engage the locking teeth of the locking member.

A wheel that deforms to absorb force is provided. The wheel includes one or more deformable spokes that extend from a central portion of the wheel to an outer portion of the wheel. The spokes are configured to interface against neighboring spokes after a spoke is sufficiently deformed. The neighboring spoke provides some support to the deformed spoke, thereby requiring an increased marginal force to further deform the first spoke. In one embodiment the wheel includes a plurality of pairs of spokes that are configured to interface against each other.

A walk-behind working tool having a frame, a power source, and a handle attached to the frame is provided. The working tool includes at least one axle operatively connected to the frame and a pair of wheel assemblies connected to the axle. The wheel assemblies include a hub, a rim, a tire, and a flexible vibration dampening assembly that operatively connects the hub and rim, wherein the dampening assembly is configured to reduce the vibration transferred between the rim and hub and through the handle to the operator. The dampening assembly includes a plurality of elastic elements having a spring constant for smoothing out movement of the frame when the working tool is guided over rough or uneven ground.

A collapsible stroller includes a stroller frame, at least one hinge mechanism, a wheel, and a swivel mechanism. The stroller frame is moveable between a deployed position and a collapsed position. The hinge mechanism allows for movement of the stroller frame between the collapsed position and the deployed position. The swivel mechanism connects the wheel to the stroller frame. The swivel mechanism includes a vertical axle, a cam follower, and a cam. The vertical axle connects with the wheel and is rotatable with respect to the stroller frame about a vertical axis. The cam follower is fixed to the vertical axle. The cam includes a sloped cam surface at least partially surrounding the vertical axle. The sloped cam surface contacts the cam follower to move the cam follower along the sloped cam surface, which results in rotation of the vertical axle about the vertical axis.

A collapsible stroller includes a stroller frame, at least one hinge mechanism, a wheel, and a swivel mechanism. The stroller frame is moveable between a deployed position and a collapsed position. The hinge mechanism allows for movement of the stroller frame between the collapsed position and the deployed position. The swivel mechanism connects the wheel to the stroller frame. The swivel mechanism includes a vertical axle, a cam follower, and a cam. The vertical axle connects with the wheel and is rotatable with respect to the stroller frame about a vertical axis. The cam follower is fixed to the vertical axle. The cam includes a sloped cam surface at least partially surrounding the vertical axle. The sloped cam surface contacts the cam follower to move the cam follower along the sloped cam surface, which results in rotation of the vertical axle about the vertical axis.