| 摘要 |
A ladder levelling device which is simply operated by person's foot, embodying stile extender (7) either inserted into hollow stile (1) or removably attached to side of solid stiles of ladders or stepladders. Consisting of outer fixed housing, internal telescopic extender (7) and ratched mechanism, with teeth (20) in the extender (7) engaging with teeth (23) attached to an arm (21) which can rock about a pivot (4) in the housing to disengage the opposing teeth (20). A roller (15) or low friction device attached to the arm (21) between the teeth (23) and the pivot (4) disengages the teeth (23) during extending to reduce wear. A cam (12) attached either directly or indirectly to the opposing end of the arm (21) enables retraction and acts as safety device that prevents movement in either direction. A foot (30) is attached to base of expander by a spindle (31b) which allows limited universal movement and is capable of being locked in position.
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