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  2. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    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.

  3. Telescoping (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Telescoping_(mechanics)

    Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...

  4. Jaipur foot - Wikipedia

    en.wikipedia.org/wiki/Jaipur_foot

    The Jaipur foot is composed of a wooden ankle and a rubber heel and forefoot section, all surrounded by a thin outer layer of tire cord, a rubber composite. [ 3 ] It is a modification of the Solid Ankle Cushioned Heel (SACH) foot, with the wooden ankle of the SACH foot replaced with a more flexible block of rubber, which allows the user to ...

  5. Step stool - Wikipedia

    en.wikipedia.org/wiki/Step_stool

    Step stool with 3 steps. Step stools have a wide range of uses, being an important aid for working at home. The ones with a wide platform, they are very practical for wall painters, who can even walk on the platform without having to go up&down every time they need to change their work area a few inches.

  6. Rubberwood - Wikipedia

    en.wikipedia.org/wiki/Rubberwood

    Rubberwood is a light-colored medium-density tropical hardwood obtained from the Pará rubber tree (Hevea brasiliensis), usually from trees grown in rubber plantations. [1] Rubberwood is commonly advertised as an " environmentally friendly " wood, as it makes use of plantation trees that have already served a useful function.

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