26 and is shown in fig5 as being mounted to a left side parallel bar 26 it is to be understood that either mounting arrangement is permissible and the invention also contemplates the use of a pair of handrails 40 one mounted to each side of the frame section 22 reference should be made to fig6 for an understanding of the engagement of the second embodiment of the invention into a use position fig6 is a view taken along the lines 6 6 of fig4 showing the engagement of latch 54 against inclined plate 49 in the use position in this position pin 52 engages through the topmost end of slot 50 in each of the parallel bars 26 likewise handrail 40 is shown in the use position in fig6 wherein pin 60 is engaged near the topmost edge of slot 62 and handrail 40 is held against one of the parallel bars 26 as shown it is to be understood that latch 54 may take other forms different from the precise form shown in fig6 for example latch 54 may take the form of a welded angle bracket which has a lower end spaced away from the surface of parallel bars 66 so as.