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The telescopic forks are devices composed by a fixed body and by a variable number of sliders to handle the loads. Such systems are mainly used in automatic warehouses and in industrial automation systems. In the automatic warehouses, the telescopic forks handle loads from the aisle centre to the rack positions and vice versa. In the industrial automation system, this device is used for various applications: for example it can be installed on AGVs with a lifting unit or used in production line change.

Telescopic forks are classified as follows:

• Single Deep forks: have two mobile parts and one fixed body. These forks make a bilateral movement called “single deed”, are therefore able to handled loads stored in a single line shelves.
• Double Deep forks: have three mobile parts and one fixed body. These forks make a bilateral movement called “double deep”, so can handle loads stored in a two lines shelves. The forks with three sliding parts, can reach a higher ratio between the stroke and the fork length if compared to the single deep ones: that means that it is possible to obtain greater strokes that those achievable by single deep forks or, alternatively, it is possible to handle heavy loads by reducing the maximum stroke.
• Triple Deep forks: have four mobile parts and one fixed body. These forks make a bilateral movement called “triple deep”, are therefore able to handle loads stored in a three lines shelves. Usually this kind of forks are used as double deep forks in case a reduced fixed body length is required or a high load shall be handled.

 

The motion is transmitted from the geared motor to the first mobile part; the second sliding part will move at a double speed compared to the first one, thanks to a series of gears, chains or belts bounded to  the fixed body. In case of double (or triple) deep telescopic forks, the motion will be transferred to the third (or fourth) sliding part. Wheels are used to let the sliding part moving, while lateral guided is obtained by using polyzene or bronze shoes.