For those who are inconvenient to move, they need a means of transportation, that is, the wheelchair we have seen, but what about the stairs? Because of the development of technology, there are manual climbing stairs, I think everyone may be like this. The wheelchair is still not well understood, so let's introduce it to the small series of the decoration home network. What are the principles and characteristics of the manual climbing wheelchair ?
First, the principle of manually climbing stairs
1. Ordinary wheelchairs do not have the function of climbing stairs and crossing roadblocks, which greatly limits the range of activities of paraplegic patients with lower limbs and elderly and infirm who use wheelchairs as a means of transportation. In order to solve this problem, and considering the current affordability of most wheelchair users in our country, the crawling device should not be excessively complicated. The Rehabilitation Research Center of the Fine Arts Department of Tsinghua University first developed a manual stair climbing wheelchair.
2. It is made up of a set of stair climbing actuators and drive system on the ordinary wheelchair, that is, it can be driven on the ground, and the wheelchair can be used to climb the stairs and down the stairs only by the strength of the user's arms. The structural diagram of the stair climbing wheelchair is shown in Fig. 1. The main feature is that a stair climbing actuator composed of a parallelogram mechanism is added on both sides of the ordinary wheelchair. The two equal length connecting rods (cranks 3, 8) in each set are fixed to a gear (4, 10) of the same number of teeth and driven by the chain 7. The four cranks on both sides are installed in the same phase, and the connecting rods (ie, the climbing stair bar 9) have a "leg" at each end, and the four "legs" form two sets of supporting systems with the original four wheels of the wheelchair.
3. When the handlebar 1 is shaken and passed through a set of transmission mechanisms so that the four cranks rotate synchronously, the two sets of support systems take turns to ground and the other set of support systems are lifted up to the upper (or lower) step until boarding Finish a flight of stairs. The seat and backrest of the wheelchair can be adjusted in such a way that the seat is always in a horizontal position when climbing the stairs. In order to reduce the height of the center of gravity of the wheelchair during the stair climbing process and increase the stability and safety, whether it is going up or down the stairs, the method of “downstairs†is adopted, that is, the backing mode is adopted when going up the stairs.
Second, the characteristics of manual stair climbing wheelchair
1. There are two sets of wheels at the bottom of the wheelchair. Each set of wheels has a pair of large wheels and a pair of small wheels. The front two sets of larger wheels have bearings on the surface of the wheel. The bearing wheels are followed by a pair of small wheels. On the wheels, there are no bearings; above the wheels, there are multiple sets of seemingly complex drive shaft sets, some of which are connected to the two sets of wheels underneath, and some are connected to the top chair; in wheelchair chairs In front, there are two joysticks similar to the car's transmission.
2. The wheelchair can move freely on any stairs by leaning on the joystick in front of the chair and the two sets of switches on the drive shaft. By adjusting the switches of the two drive shafts on the wheelchair, the wheel sets of the wheelchair can be widened and widened to accommodate different types of stairs. By controlling the joystick in front of the wheelchair, the wheels can be angled and tightly engaged with the stairs. The wheelchair descended from the stairs above.
Wheelchairs can be seen in our lives, but the types of wheelchairs are not so well understood, so what are the principles and characteristics of manual climbing stairs, I think you have read the introduction of Xiaobian now. If you still want to know more about decoration information, please continue to pay attention to the decoration home Internet cafe.
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