Which is the best way to learn the hydraulic lever and the crank lever?!
What is the cause of this injury? Desktop tilt! We all feel that for so many years with wooden furniture, there is no problem, but once in the need to continue lifting table, because the characteristics of a soft expansion coefficient, and it is easy to cause the left and right ends of the desktop is highly uneven desktop tilt (even if only 5 degrees is very terrible, the quality inspection the standard is three years time does not exceed 0.3 degrees tilt allowed as children's products sales).
The gear structure is also the culprit of the desktop tilt:Two simple lifting gear with a bar on the support of the entire desktop, believe in junior high school physics knowledge of the people is not difficult to analyze, end and end force transmission arm large deviation (3.5 times /m), long-term use is easy to damage will not say, resulting in table hurt the baby thing is can not endure the!
