Rack and pinion type expansion fork: the use of three or four sections (or three sections, four sections, can also be understood as single deep, double deep), of which the single deep fork is a complete fork expansion mechanism composed of the front fork, middle fork, fixed fork and guiding roller components (double deep fork is composed of the front fork, upper middle fork, lower middle fork, fixed fork and guiding roller)! The fixed fork is installed on the loading platform, the lower middle fork is driven by the gear and rack, and moves outward about half of its own length, the upper middle fork extends outward from the middle point of the lower middle fork plate, and the front fork extends outward from the middle point of the upper middle fork to a slightly shorter length than itself!

Chain type telescopic fork: it is composed of front fork, upper middle fork, lower middle fork, fixed fork and guide wheel, etc., fixed fork installed on the loading platform, fixed fork and upper, middle fork are all connected by sprocket and chain! Yihong company's fork series products include V-type fork single extension fork, fiber tray special fork