11/5/2023 0 Comments Ladder jack scaffold safety![]() Frame 8 consists of two elongated rods 16 disposed in closely spaced side-by-side relation and connected rigidly at spaced apart points of their lengths by spacers 18, and adapted to lie against the rungs 6 of the ladder, longitudinally of said ladder. 1-9 consists generally of a frame 8 carrying a slide 10, a beam 12, and a link 14. The ladder jack forming the subject matter of the present invention, in the form thereof shown in FIGS. In most ladders the spacing of the rungs is generally standardized at one foot, but is subject to some manufacturing variation, and also to variation by bowing or warping of the rungs themselves. Like reference numerals apply to similar parts throughout the several views, and the numeral 2 applies generally to a ladder including a pair of side rails 4 (one shown) connected at longitudinally spaced apart points by rungs 6 extending at right angles thereto. Hamilton ABSTRACT A ladderjack consisting of a beam having a hook at one end engageable over a ladder rung and adapted to support a scaffold plank thereon, a link pivoted at one end to the opposite end of the beam, a hook at the opposite end of said link engageable over a relatively higher rung of the ladder, the link being adjustable in length to level the beam in various positions of use, and a connection joining the hook ends of the beam and link to permit limited free relative movement therebetween. E04G5/065- Consoles Brackets specially adapted for attachment to laddersÄ¥2 us.E04G5/00- Component parts or accessories for scaffolds.E04G1/28- Scaffolds primarily resting on the ground designed to provide support only at a low height.E04G1/00- Scaffolds primarily resting on the ground.E04G- SCAFFOLDING FORMS SHUTTERING BUILDING IMPLEMENTS OR AIDS, OR THEIR USE HANDLING BUILDING MATERIALS ON THE SITE REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS.E06C7/16- Platforms on, or for use on, ladders, e.g.E06C7/00- Component parts, supporting parts, or accessories.E06- DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US16456371A external-priority Application filed by Individual filed Critical Individual Application granted granted Critical Publication of US3759474A publication Critical patent/US3759474A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee Individual Priority date (The priority date is an assumption and is not a legal conclusion. ![]() Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US00164563A Inventor W Narkie Current Assignee (The listed assignees may be inaccurate. ![]() Google Patents US3759474A - Ladder jackÄownload PDF Info Publication number US3759474A US3759474A US00164563A US3759474DA US3759474A US 3759474 A US3759474 A US 3759474A US 00164563 A US00164563 A US 00164563A US 3759474D A US3759474D A US 3759474DA US 3759474 A US3759474 A US 3759474A Authority US United States Prior art keywords ladder link jack pin slide Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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