Stair climbers

Two-wheel hand tracks are very common and diffused also in nonindustrial applications. They can be easily moved by an operator, but the weight of the product to deliver is limited. The loading of a product is obtained by inserting the ledge underneath it and allowing the object to tilt back and rest on the ledge. Some of them are equipped with a stair-climber device in order to go up and down along stairs. 

Two-Wheeled Hand Trucks. Two-wheeled hand trucks (Fig. 4.39) are essentially levers on two wheels. The axle connecting the wheels serves as the fulcrum of the lever and carries up to 80 percent of the total load moved.The two-wheeled cart is normally used for short nonrepet-itive moves of smaller loads over smooth floors. Carts are generally 48 to 64 in (1.2 to 1.6 m) high, and are designed to carry a variety of materials in bags, barrels, bales, boxes, and bins.Typical accessories include height extension, stair climbers, safety brake, spread clamps, and straps. 

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