Change gear transmission in group construction, especially for land vehicles and vehicles for the building industry

A geared transmission comprising:

• a first transmission group having a first input shaft and a first output shaft, a main second transmission group following the first transmission group and having a second input shaft and a second output shaft, a main output shaft driven by said second output shaft and connected to a load, said first transmission group having first clutch means engageable to provide a first forward drive stage between the said first input shaft and said first output shaft and a second drive stage between the said first input shaft and said first output shaft, providing an alternative drive between the said first input shaft and said first output shaft upon disengagement of said first clutch means, said second drive stage including a selectively engageable friction clutch having a common primary driving part which is continuously connected through the said input shaft of said first group with the output side of a prime mover, and secondary driven parts interposed between said primary part and said first output shaft, one of said secondary parts being connected to said first output shaft for forward drive and the other of said secondary parts being connected to said first output shaft for driving in the opposite direction for reverse drive, so that with said first clutch means disengaged, said primary driving part may selectively engage either of said secondary parts for either forward or reverse drive.