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An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
This means that if there is a 4" (100 mm) gutter projecting from the side of a building, a fixed ladder would have to have standoff brackets that were at least 11" (7" + 4") (280 mm) in length. Cages: Cages are optional for fixed ladders with a floor to floor elevation of less than 20' (6100 mm). They are often available for ladders with ...
DIN 4420-2 - Working and protection scaffolds – Ladder scaffolds DIN 4420-3 - Service and working scaffolds - Part 3: Selected types of scaffolding constructions and their basic versions [ 2 ] DIN 4420-4 - Working and protection scaffolds – Prefabricated scaffolds – Materials, components, dimensions, loadbearing capacity and safety ...
Aerial ladder A rotating, power-operated (usually hydraulically) ladder mounted on a self-propelled automotive fire apparatus. [1] Aerial ladder platform A hydraulic aerial device which combines an aerial ladder with a personal carrying platform supported at the end of a ladder. [1] Air monitoring meter
An intermediate landing is a small platform that is built as part of stairs between main floor levels and is typically used to allow the stairs to change directions, or to allow the user a rest. A half landing, or half-pace, is where a 180° change in direction is made, and a quarter landing is where a 90° change in direction is made (on an ...
Part of a ladder diagram, including contacts and coils, compares, timers and monostable multivibrators. Ladder logic is widely used to program PLCs, where sequential control of a process or manufacturing operation is required. Ladder logic is useful for simple but critical control systems or for reworking old hardwired relay circuits. As ...
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