It is usually a steel staircase intended for use by firefighters, the location and number of which are determined by the nature of the building, the number of floors and fire protection requirements. There are two types of fire ladders: straight and inclined: the straight type is mostly steel ladder, which is only used in the range of one or two height difference; the inclined type slope is 60°~80°, and the handrail, the fence and the cantilever are required. Rest platform, etc. In order to meet the needs and safety of the high-rise buildings, there are left and right lifts of not less than 600 × 700 mm on the platform. The lowest level of the fire ladder must be 2 to 2.5 meters from the ground to prevent idlers from climbing.
Office chairs are compared to previous times, More attention is paid to human factors such as the flexibility and comfort of the chairs, In order to relax yourself as much as possible in a intense working atmosphere, To improve the enthusiasm and efficiency of work. Human design highlights the people-oriented concept, That is, to emphasize the morphological beauty of the appearance, Also value the inherent comfort, functionality, and environmental protection of the CHAIR itself, It is a human care for psychological and physical people. From a psychological perspective, Now for the office chair design, With a beautiful external form, Its materials in texture and color aspects, Environmental protection is also constantly strengthening, Give people a pleasant psychological feeling. From a physiological point of view, the humanized design ensures the comfort of the chair, especially in the design is more obvious. Comfort is the design based on the human engineering degree, which must be based on the scientific analysis of the size of the human body, and should understand the population and region of the product. Only in this way can we achieve the real humanization.
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