ladders _ autonopedia

Upload: zacharias-angourakis

Post on 04-Jun-2018

225 views

Category:

Documents


0 download

TRANSCRIPT

  • 8/13/2019 Ladders _ Autonopedia

    1/13

    www.autonopedia.orgAutonopedia> Crafts and Technology> Tools> Tools And How To Use Them > Ladders

    Ladders

    The Old Testament story of Jacob's dream shows that ladders must have been in use in the

    Middle East during the Bronze Age or even earlier, as the Tower of Babel could hardly have

    been built without them. They have changed little since, except for getting lighter, longer,

    safer and extensible.

    Single Ladder

    SIZE: 6 to 26ft.

    MATERIAL: Wooden: Stiles: softwood; Rungs: hardwood Metal: aluminum alloy

    ACCESSORIES: Ladder brackets, ladder stays, safety feetUSE: To provide access to a high worksite

    The wooden single ladder is made of two straight grain uprights called "stiles", which are joinedby "rungs" which act as steps when the ladder is leaned against a wall. The stiles are made of

    a variety of softwoods, while the rungs are made of hardwood. The rungs of the better quality

    ladders are tenoned through the stiles and wedged from the outside to form a strong joint. As

    an extra precaution, metal reinforcing rods are stretched across the underside of the rungs.

    http://autonopedia.org/crafts-and-technology/tools/tools-and-how-to-use-them/http://autonopedia.org/crafts-and-technology/tools/http://autonopedia.org/crafts-and-technology/http://autonopedia.org/
  • 8/13/2019 Ladders _ Autonopedia

    2/13

    A pole ladder has semicircular stiles cut from one straight length of lumber. This type of ladder

    is normally a fixture on a scaffold erection.

    Aluminum ladders are lighter than the equivalent wooden ladders and will not warp or crack.

    The stiles are a hollow box section. The rungs are ribbed to provide grip.

    Pole ladder

    The semi-circular stiles of the pole ladder, cut from one piece of wood, give equal spring on

    both sides of the ladder.

    LADDER STAY

    When working on overhanging guttering or pipework use a ladder stay to hold the top of the

    ladder away from the wall and to bring the work within easy reach. Fit the bar of the stay withnon-slip pads. Never lean backward on a ladder.

    LADDER BRACKETS

    Ladder brackets are used in the construction of a work platform. Stand two ladders at the

    same angle so thai scaffold boards stand evenly. The brackets either hook on the front of the

    ladders or hang underneath them. Simple brackets ate fixed at an angle, while the better

  • 8/13/2019 Ladders _ Autonopedia

    3/13

    versions are adjustable. All brackets are wide enough to take two boards. Use a third ladder to

    get to the platform.

    SAFETY FEET

    Aluminum ladders are normally fitted with rubber or plastic non-slip end caps. You can also buy

    special feet for wooden ladders in use on potentially slippery surfaces. The feet are either

    rubber pads or, where the surface is suitable, textured to grip the ground.

    Extension Ladder

    SIZE: Closed height: 6 to 20ft.; Extended height: 18 to 36ft.

    MATERIAL: Wooden: Stiles: softwood; Rimgs: hardwood; Metal: aluminum alloy

    ACCESSORIES: Ladder brackets, ladder stays, safety feet

    USE: To provide access to a high worksite

  • 8/13/2019 Ladders _ Autonopedia

    4/13

    An extension ladder is a combination of two or three sections sliding one inside the other to

    form a ladder of varying height. Metal brackets hold the sections of ladder together whiie hooks

    on the bottom of one section locate on the rungs of the lower section. They are either

    extended by hand or, after a certain length, are fitted with a rope and pulley system to extend

    the upper sections. The sections are constructed like a single ladder.The rungs of overlapping sections should align to maintain a constant tread height. No section

    should be extended more than three quarters of its actual length.

    Reinforcements

  • 8/13/2019 Ladders _ Autonopedia

    5/13

    The stiles on wooden ladders are reinforced on the underside with a recessed steel cable.

    Trestle

    OTHER NAME: Painter's trest le

    SIZE: Height: 3 to 14ft.

    MATERIAL: Softwood

    USE: To support scaffold boards

    Trestles are designed to be used in pairs to support scaffold boards in order to construct a

    work platform to reach the ceiling or high walis.

    The cross bars on one half of the trestle are staggered with those on the other half. This gives

    you a greater choice of platform height while keeping the weight of the trestle down.

  • 8/13/2019 Ladders _ Autonopedia

    6/13

    The top of the stiles are cut at an angle to form a stop when the trestle is fully opened, but

    secondary ropes or stays are sometimes fitted below.

    The trestle should be able to support two boards side by side. Make sure that the boards

    overhang the cross bars by a safe amount.

    Scaffold Board

    OTHER NAME: Scaffold plank

    SIZE: Length: 5 to 14ft.; Width: 6 to 8in.

    MATERIAL: Softwood

    USE: To make work platforms

    Scaffold boards are used with trestles or step ladders to form work platforms above the ground.

    They are cut from straight grained, knot-free softwood. The ends are bound with metal strip toprotect them from damage.

    Always make sure that the boards are secure, and if in doubt, clamp or tie them in position.

    Double up on the boards when bridging a span greater than 5ft.

    Step LadderOTHER NAME: Builder's steps

    SIZE: 5 to 16 treads

    MATERIAL: Softwood, aluminum alloy

    USE: Indoor ladder

    Step ladders, made in wood or metal, are self supporting, having a frame hinged to the back of

    the ladder. Instead of rungs they have wide steps which lie horizontally when the ladder is fully

    opened. The hinged sections are fitted with ropes or folding stays to prevent them sliding open

    further than the optimum position. A platform at the top of the ladder carries tools or paint

    cans.

    Safety factors

    Inspect step ladders before use paying particular attention to the condition of the steps, stays

    and hinges. Make sure that the steps are fully opened and on even ground before climbing on

    them.

    Do not lean or stretch too far out on the step ladder, as it can easily fall sideways.

    If you must erect a step ladder in front of a door, either lock it or give plenty of warning to

    other members of the household.

  • 8/13/2019 Ladders _ Autonopedia

    7/13

    Wood ladder construction

    Hinges are screwed to the ladder back while the heads are housed in the wood and further

    secured by gluing and nailing.

    Multi-Purpose Ladder

    SIZE: Closed height: 4ft. 6in. 6ft. 3in.; Maximum extended height: 14ft. to 21ft. 6in.

    MATERIAL: Tubular steel, aluminum alloy

    USE: To do the jobs of an extension ladder, step ladder and trestle

    There are now several multipurpose ladders on the market, which combine the functions of

    different types of ladder and are adjustable to stand on a flight of stairs.

  • 8/13/2019 Ladders _ Autonopedia

    8/13

    They will perform as a pair of step ladders, which in some cases are adjustable in height. They

    can be used as a pair of trestles to support a scaffold board. All designs are capable of being

    converted to an extension ladder.

    Each half of the system can be adjusted independently so that the ladder will stand securely

    on a flight of stairs. The addition of scaffold boards allows you to reach the sides of thestairwell without moving the ladder. Whenever you construct a platform over a staircase, make

    sure that it is safe before using it. If necessary, remove the stair carpet and screw wooden

    blocks to the treads to secure the foot of the ladder. Clamp or lash the scaffold board securely

    to the ladder if it does not seem secure.

    Using the ladder

    Position the scaffolding board on the rungs at one end and the stair tread at the other.

    Inspection and maintenance

  • 8/13/2019 Ladders _ Autonopedia

    9/13

    Always inspect a ladder before using it, especially if it has not been used for some time. With

    wooden ladders, look out for cracks in the stiles especially running from a rung. The rungs

    themselves should be damage free. Do not repair them "temporarily" with nails or rope lashings.

    Do not use a ladder with loose joints and especially if there is a rung missing. Check that the

    brackets and hooks of an extending ladder are securely fixed and that any rope or pulley

    system is in good condition.

    Painting a ladder may obscure faults, but a coat of clear matt lacquer will preserve it.

    Carrying a ladder

    Carry the ladder held upright, one hand hooked under a rung and the other hooked over

    another. Alternatively, carry it on your shoulder with your hand passing through the ladder and

    gripping a rung. Support the ladder with the other hand.

    Erecting a ladder

    At the site, support the foot of the ladder against the wall and gradually raise it to the vertical

    by walking towards the wall.

    Move the foot out from the wall for a distance the quarter of the length of the ladder. Make

    sure the ladder is upright and not resting against guttering or window glass.

    Pulling out the foot

    The foot should be extended one quarter of the ladder's length.

    Extending ladders

  • 8/13/2019 Ladders _ Autonopedia

    10/13

    You will need help to erect an extending ladder. Support the ladder from behind and hold it

    away from the wall while each section is extended. Avoid rubbing the ladder against the wall

    which will damage both the surface and the ladder. If the ladder extends beyond a staging, it

    should project at least 36in. above the level.

    Securing the ladder

    Secure the base of the ladder to prevent it slipping. If it is on soft or loose ground, rest it on a

    board to spread the load and screw a wood piece to the board to support the ladder's foot.

    Even on firm ground, it is advisable to fix safetv feet, especially if the surface is slippery, and

    guy ropes should still be used if necessary. As a last resort support the foot of the ladder with

    bags of sand.

    Preventing movement

    Tie the ladder back to a firm fixing on the wall or to tent pegs driver, into the ground to

    prevent it slipping sideways.

    Safety factors

    Wear well-fitting shoes, not rubber boots, and check that there is no grease, mud or sand on

    the soles before ascending the ladder. Face the wall when going up or down the ladder.

    Never stand higher than the fourth rung from the top so you can always hold on with at least

    one hand. Resist the temptation to overstretch, keeping the main weight of your body squarely

    on the ladder.

    Roof Ladder

    OTHER NAME: Cat ladder

    SIZE: 10 to 22ft.

    MATERIAL: Softwood, aluminum alloy

    USE: To gain access to a sloping roof

    A roof ladder provides access and spreads the load over fragile materials.

  • 8/13/2019 Ladders _ Autonopedia

    11/13

    Stow your tools between the rungs of the ladder to prevent them slipping off the roof.

    Using the roof ladder

    Turn the ladder on its back and run it up the roof on its wheels. At the top, turn it over and

    place the hook over the ridge.

    Scaffolding System

    SIZE: 6 to 40ft.

    MATERIAL: Galvanized steel, aluminum alloy

    USE: To construct a working tower

  • 8/13/2019 Ladders _ Autonopedia

    12/13

    The easiest system of scaffolding for a home user incorporates prefabricated tubular metal

    frames. They plug together in rectangular frames and are braced diagonally to form a rigid

    structure. The system can be used to build structures from a simple mobile platform to paint a

    ceiling, to a tower which will reach the roof of a large house.

    The base can be fitted with metal base plates. Place wooden boards under the base plates on

    soft ground. Alternatively, locking castors can be plugged into the frame so that the tower can

    be moved from one location to another without dismantling. Do not, however, move the

    platform if someone is standing on it.

    The work platform is made from boards supplied with the system, which have locating boards

    on the underside to fit inside the frame. "Toe" boards fit all around the platform to prevent

    tools being accidentally kicked off.

    Interlocking frames

  • 8/13/2019 Ladders _ Autonopedia

    13/13

    A joint system which fits the top of the frame over the lower prevent rain water collecting in

    the joint.

    Retrieved from the CD3WDproject.

    Rebuilt and re-compiled to be useable by Autonopedia

    Autonopedia> Crafts and Technology> Tools> Tools And How To Use Them > Ladders

    http://autonopedia.org/crafts-and-technology/tools/tools-and-how-to-use-them/http://autonopedia.org/crafts-and-technology/tools/http://autonopedia.org/crafts-and-technology/http://autonopedia.org/http://www.cd3wd.com/CD3WD/index.htm