Often on the market can see two rounds and four rounds of PC Trolley Case, then the difference is mainly the structure of the difference. The simple structure of the two wheels, wheel orientation, usually half buried in the box, and the entire box connected tightly. In the case of quality clearance is almost impossible problems. The use of four caster PC Trolley Case, are fixed at the bottom of the box, the wheels are small, the connection at the fine, relative to the two round of the box, under the same volume it is much higher. Relatively speaking, the four wheels in terms of quantity or quality, the probability of a problem is much greater. In addition, the general material of the universal wheel box is plastic or metal, because it is symmetrical around the force, the requirements become higher, unlike the directional wheel box, with the rod that side do sturdy, the back of the use of textile fabrics on the line. Due to the different structures, the most intuitive place is the price, good quality 22-inch directional 2 rounds generally in 350 +, and universal 4-inch 22-inch fly in 550 +. Tractor side: 1. Leveling the ground: Directional wheel box oblique pull, more difficult, especially heavy things heavier burden. The universal wheel box is four-wheel translation, very labor-saving. 2. Ramp: Both boxes should be inclined, directional wheel box wheel axis generally coincides with the box lever, a little more effortless than the caster box PC. However, there is a detail, the steering wheel box can be directly pulled up, and if the universal wheel to lift over the hurdle to use two wheels to pull, it is likely that the wheel is sliding on the ground rather than rolling friction, it is annoying. 3. uneven ground: directional wheel box pull extremely bumpy, universal wheel box because there is no inclination but more difficult. Dumping aspects: 4. General casters than the directional wheel box heavy, very difficult to raise. 5. General casters than the directional wheel box high, the need for space position. 6. In public transportation: The caster case of the caster must be tipped over, otherwise the vehicle may bump, brake, and accelerate (the caster case with brakes is more expensive). Directional wheel box certainly comes with brakes.
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