Right angular cross-over switch for conveyor track system

Claim 1

A transfer mechanism for a trolley conveyor system comprising a relatively stationary support member and relatively stationary track sections forming parts of the system fixed to the support member in a common plane and on intersecting paths, a movable track section adapted for selective alignment with individual ones of said relatively stationary track sections whereby a trolley may pass freely from one stationary track section to another in the system by passing over the movable track section while the latter is in one stabilized position, plural stop means to arrest the movement of the movable track section in either of two stabilized positions, a pivoted striker element in the path of movement of the trolley approaching the transfer mechanism on any of said stationary track sections, and over-dead-center linkage having a connection with the relatively stationary support member and with the pivoted striker element and being operable upon engagement of the striker element by a moving trolley to move the movable tracK section from one stabilized position to the second stabilized position thereof, said intersecting paths of the relatively stationary track sections being at right angles and said relatively stationary track sections being interrupted at the central area of the transfer mechanism to form a gap, said movable track section comprising a rigid track section turnable to either stabilized position to bridge the gap between pairs of interrupted stationary track sections, and a pivoted member carrying the movable track section and having connection with said linkage and being pivoted to the stationary support member, said pivoted member carrying the movable track section including a plate portion disposed in the plane of said plural stop means and having edge portions engageable with the stop means to arrest turning of the pivoted member at two right angular positions.