Collapsible catwalk

A collapsible catwalk comprising, in combination:

• a support frame having a base and a top section;
• trolley means mounted on the frame top section adapted to suspend the support frame for lateral linear travel on at least one horizontal support rail, at least one guide wheel extending rearwardly from the support frame for maintaining the support frame vertical and for facilitating and guiding the support frame during lateral linear travel, a platform pivotally mounted on the support frame at the base thereof for pivotal movement from a substantially vertical retracted position to a substantially horizontal extended forward position, collapsible safety rails surrounding the platform pivotally mounted on the platform for collapse upon retraction of the platform and for erection upon extension of the platform and brake means extending rearwardly from the platform for stopping the lateral movement of the catwalk when the platform is extended to its horizontal position and wherein said brake means are disengaged when the platform is in its vertical retracted position.