Emerson Electric Company

Green Bull, Inc.

Thomas J Schmitt

Claude R Wallick, Jr

Paul R Swiderski

David L Pringle

John L Krebs

Bruce E Bogart

William H Frank

A structural step including relatively moveable parts wherein pressure step contact therebetween generates an impact audible mechanical sound alarm in a selected decibel range.

Step signal

A wear protection device for disposition between two relatively moveable members and particularly adapted for use for protecting rungs of extension ladders, the protection device being mountable on a ladder rung, the device including a fastener guide to enhance fixing and firmly gripping the device in place on the ladder rung.

Ladder wear protection device

A ladder wall stand-off accessory for mounting on a ladder rung between the spaced side rails of a ladder section including arm stand-off means with wall surface pad means extending therefrom and having rung gripping means pivotally mounted thereon to engage with the ladder rung to be fastened thereto in clamping relation therewith, a novel rung adapter bar being provided to mask the ladder rung if required.

Ladder stand-off accessory and rung adapter therefor

A rung lock assembly for selectively and releasably locking a pair of adjacent rungs of relatively slidable fly ladder and base ladder sections of an extensible ladder including a rung lock frame pivotally mounted within the fly ladder section to be normally urged into engagement with adjacent rungs of the ladder sections and a pulley and cable system cooperative with the rung lock frame to release and move the same away from such engagement for relative slidable movement of the ladder sections.

Rung lock assembly for an extension ladder

A method of making foldable ladder structure wherein plastic material is injected and expanded in molds to form several parts of a foldable ladder which includes front and rear ladder sections that can be pivotally hinged at their upper portions, a collapsible shelf and spreader linkage to allow the sections to be relatively pivoted from collapsed face-to-face relation to erected position.

Method of manfacturing a foldable ladder structure

A method and apparatus for treating preselected areas of metallic ladder rungs wherein such metallic spaced rungs are moved in a path substantially normal to the longitudinal axes of the rungs with preselected areas of the spaced rungs passing through a controlled longitudinally extending heating zone to heat such preselected areas to a desired annealing temperature.

Method and apparatus for treating ladder rungs for forming assembly with

Foldable ladder structure and method of making the same wherein plastic material is injected and expanded in molds to form several parts of a foldable ladder which includes front and rear ladder sections that can be pivotally hinged at their upper portions, a collapsible shelf and spreader linkage to allow the sections to be relatively pivoted from collapsed face-to-face relation to erected position.

Foldable ladder structure and method of manufacturing the same

Step ladder

Step ladder back section

Molded step ladder top

An improved shoe for a structural support and an improved method of forming the same wherein rigid angular parts have the base members positioned in cooperative reinforcing relation and joined together with the side members extending in opposed faced and spaced relation to each other to form the structural shoe.

Growing community of inventors

Jefferson County, KY, United States of America

Thomas J Schmitt