发明名称 Ladder leg extender apparatus with improved vertical adjustment means
摘要 A ladder leg extender apparatus for attachment to the leg of a ladder to lengthen the leg as required to support the ladder on an uneven support surface. The apparatus comprises a sleeve secured to a shortened leg of the ladder which slidably carries an extendible support leg therein for movement inwardly and outwardly of the sleeve to adjust the length of the leg. Infinitely variable vertical adjustment of the support leg is achieved by (1) loosening two turn bolts which secure the support leg between the bolts on one side and a coarse file on the other side thereof within the sleeve and then (2) tightening the bolts when the support leg is properly slidably adjusted with the associated ladder is in an upright and level orientation.
申请公布号 US5064024(A) 申请公布日期 1991.11.12
申请号 US19910674615 申请日期 1991.03.25
申请人 BARHAM, LEONARD J. 发明人 BARHAM, LEONARD J.
分类号 E06C7/44 主分类号 E06C7/44
代理机构 代理人
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