turning to fig4 details of the second embodiment are illustrated the apparatus 110 further comprises a lower engagement member 114 adapted to engage ladder rung r 1 and an upper engagement member 116 adapted to engage adjacent rung r 2 the apparatus 110 also comprises a spring 118 biasing the lower engagement member 114 and the upper engagement member 116 against the rungs r 1 r 2 the lower engagement member 114 and upper engagement member 116 preferably comprise hooks 120 adapted to contact the ladder rungs on the opposite sides ro preferably the spring 118 contacts one of the engagement members 114 116 a ram 126 then makes contact with the other engagement member biased by the spring 118 most preferably the ram 126 and spring 118 are enclosed within a guide 122 having a central core 124 with the ram 126 reciprocating within the guide 122 a second guide 126 ram 122 and spring 118 may be employed as shown in fig4 it will be seen that to attach the apparatus 110 to the rungs r it is merely necessary to expand the spring 118 by hooking one of the members 114 under a rung then pulling the upper engagement member 116 away from the lower engagement member 114 the spring tension is released allowing the other member 116 to slide over the adjacent rung to facilitate this operation a handle 128.