What is the upper surface of the starfish called? what is the lower surface of the starfish called.
Contents
- Rails.
- Rungs.
- Base Section.
- Fly Section.
- Rung Locks.
- Rope and Pulley.
- Stop.
The telescopic sections of an Extension Ladder, also known as Fly Sections, are held into their adjusted position by extension locking devices known as Rung Locks.
- STEPS. We’re starting with the steps because they are the most common, and obvious piece of the puzzle when building a ladder. …
- RAILS. The rails are the vertical pieces in which the steps are attached. …
- SHELF. …
- EXTENSION LOCKS. …
- RUNGS. …
- FLY SECTION. …
- ROPE AND PULLEY. …
- ANTI-SLIP SHOES.
Bottom section of an extension ladder. Heel; Lowest end of the ladder.
The base of the ladder should be placed so that it is one foot away from the building for every four feet of hight to where the ladder rests against the building. This is known as the 4 to 1 rule.
An extension or straight ladder used to access an elevated surface must extend at least 3 feet above the point of support (see diagram). A ladder extended to a height of 48-ft or longer requires a 6-ft extension beyond the eave.
Because extension ladders are not self-supporting they require a stable structure that can withstand the intended load. PLAN Ahead to Get the Job Done Safely.
A ladder is a piece of equipment that has a series of steps (also called rungs) between two upright lengths of wood or metal.
TIP – The uppermost end of the ladder (opposite the butt). TORMENTOR POLES – The poles attached to the upper bed section of a 40′ or larger extension ladder. They are used to assist in raising, lowering, pivoting, and stabilizing of the ladder. Ladders are designed with solid or trussed beams.
- Stepladders. A stepladder is one of the most common ladder types with nearly universal application. …
- Straight Ladders. Also known as single ladders, straight ladders look like one half of a stepladder. …
- Platform Ladders. …
- Extension Ladders. …
- Trestle Ladders. …
- Multi-Way Ladders.
- Wells must completely encircle the ladder.
- Inside widths of wells must be at least 30 inches (76 cm).
- Inside faces of wells on the climbing side of the ladder must extend between 27 inches (68 cm) and 30 inches (76 cm) from the centerline of the step or rung.
Place the ladder feet so that the horizontal distance between the feet and the top support is 1/4 of the working length of the ladder. The ladder will be leaning at a 75 degree angle from the ground.
: a piece of wood or metal that is placed between the legs of a chair for support. : one of the pieces of wood or metal that is used as a step on a ladder. : a position or level within a group, organization, etc., that is higher or lower than others.