Abstract: A wheelbarrow includes a load carrying bin, a frame structure, a number of wheels, and a closed loop pivotal handle. The handle is attached near the rear of the wheelbarrow on a pivoting axis so that the user may adjust the height of the handle. The handle may be attached with two threaded pins having knobs at one end so a user may fix the handle at one particular height, may leave the handle entirely adjustable, or may remove the handle entirely for convenient storage of the device. The wheels are placed to provide complete support for the load and may include vertical swivel axes to make moving the wheelbarrow easier.

Abstract: A roller skate provided with a brake mechanism operable when the foot or feet of the skater inside the boots are arctuated to an arch from the normal straight position inorder to effect braking. The braking system allows the skater to perform a single foot or two feet braking at will without changing the skater's postural position at the point of time when the brake was applied. It capitalize on the principle that when the foot or feet inside the boots are arctuated, they behave like structural arches to designed that when subjected to vertical loads, the feet end supports (namely the heels and phalanges ends) exerts reaction forces with inwardly directed components. It is stable and strong. The highest point or its crown, and the point which has the biggest movement, falls somewhere between the tarsus and metatarsus zones of its respective foot. Preferably, it is crown movement that is being used to drive a brake means inorder to create an effective and controllable braking.