A conveyor comprises two helical conveying tracks and a bridging track which connects the two helical conveying tracks to each other such that products can be transported upwardly via one helical conveying track, then via the bridging track to the other helical conveying track and subsequently downwardly via the other helical conveying track. The conveyor is provided with a driveable endless conveyor belt which follows at least one of the helical conveying tracks, at least a part of the bridging track and a return track. The return track at the one helical conveying track has a vertically oriented portion and a horizontally oriented portion. The horizontally oriented portion is disposed below the bridging track and extends beyond the vertically oriented portion with respect to the center line of the one helical conveying track.