What is the automatic telescopic function of an automatic umbrella?
When the intermediate slider is moved upwards, the switch is moved upward to prevent the spring 2 from compressing the spring at the lower dead point position and the elasticity does not reach the maximum value. Only when the switch force is slightly greater than the maximum value of spring 2 elasticity, the convex switch is retracted, and the middle slider begins to move up.B. when the middle slider moves down, the upper half of the convex switch is smaller, so that the spring 1 has sufficient elasticity to make the middle slide switch locked by the convex point switch. And 2, 3 is not enough to cause the umbrella middle slider has been declining.
Working process and principle analysisA. the long handled umbrella is in a tight position, that is, the middle slide is at the lower dead point1. the elasticity of the spring 1 at the moment reaches its minimum value and is greater than 0.The 2. middle slider is at the lower dead center and is locked by the bump switch 1.On the 3 of the 3. rib buckle at the fulcrum of the slider 2, a spring 2 stretch for 0.The B. long handle umbrella is at the beginning of the opening, i.e., the middle slider begins to move up
The most important thing about the design of a fully automatic long handled umbrella is the choice of the elastic potential energy device between the upper and lower springs. The traditional semi automatic long handle umbrella pushes the slide block upwards through the pretightening force between the springs between the two sliders so as to realize the opening of the long handle umbrella. Therefore, it is proved by experiments that if a spring is added to the slider, and whether the slider can move downward similarly, the experiment shows that the umbrella can be closed. Then, the following work is how to determine the size difference and working state of the two spring preload.
