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The safest angle for a ladder is 75.5°; if it is too shallow, the bottom of the ladder is at risk of sliding, and if it is too steep, the ladder may fall backwards. This angle is achieved by following the 4 to 1 rule for a ladder placed on a vertical wall: for every four feet of vertical height, the ladder foot should move one foot from the wall.
This type consists of a rod with wide screw blades on the end and an eyelet on the other for the guy wire. It is screwed deep into the ground, at the same angle as the guy, by a truck-mounted drill machine. These are commonly used as guy anchors for utility poles since they are quick to install with a truck mounted hydraulic powered auger drive.
It incorporated a device providing automatic compensation for road camber and gradient and an automatic cut-out when the escape reached the safety limit of extension at a given angle of elevation. The hydraulic escape ladder reached full height in 18–20 seconds. In an emergency, the ladder could be operated manually.
This page was last edited on 13 January 2006, at 22:29 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Extension ladder A 20–60-foot ... Prying tool with a claw at one end and a spike or point at a right angle to a wedge at the other end. It is used in combination ...
Based on U.S. Patent Office records, H.M. Quackenbush and his company were responsible for inventing, or significantly contributing to the development of, numerous early 20th century inventions, including: bicycles; a foot-powered wood lathe; the scroll saw; darts; stair rails; the extension ladder; a bathroom shelf; the nut cracker and picks ...
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