Foldable And Extendable Ladders
A foldable ladder is disclosed having a central and two outer parallel support members
or "stiles" and a plurality of steps connected between the central and the outer stiles. Each step is arranged to fold between an erected position, in which it extends generally at right angles to the longitudinal direction of the stile to which it is connected, and a storage position in which the step lies generally parallel to the central stile with the outer stile to which it is connected extending parallel to and in close juxtaposition with the central stile. Engaging means are provided adjacent the upper end of the central stile for holding cooperating engaging means of a supporting member such as another
Household ladder section (forming an extension ladder) or a prop extending to ground (forming a step ladder).
A good-quality ladder is an essential tool for household maintenance, whether it's used for painting, cleaning gutters, or for a variety of other sundry chores. Positioning your ladder properly is the first step in using it safely.Be sure you have the proper ladder for the job. Ladder ratings are based on their weight-bearing capacity.When examining the area where you'll be positioning the ladder, check the surface the bottom of the ladder will be on. Proper locations will be firm, flat, and stable.When placing the ladder, position it using a 1 to 4 ratio. In other words, the ladder should be 1 foot away from the wall for every 4 feet it rises.Prevent movement of tall ladders by tying it securely to a solid object.
A foldable and extendable ladder having at least two ladder sections, each section comprising:
a central elongate support member and two outer elongate members arranged one on each side of, and substantially parallel to, the central member; a series of rungs disposed at spaced intervals on each side of the central member and foldably connected to the central member and one of the outer members, each rung being arranged to fold between an operative position, in which it extends generally at right angles to the longitudinal direction of each member to which it is connected, and a storage position in which the rung lies substantially parallel to the central member with the outer member to which it is connected extending parallel to and in close juxtaposition with the central member;wherein the
Ladder Manufacturer each have a front face and a rear face and are adapted to be moved relatively to one another between an aligned position one behind the other and a number of extended, partially overlapping parallel positions, the central support members having slidably cooperating parts to provide captive location of one central support member behind the other during their relative movement,whereby the rungs of each ladder section are capable of being in either the operative or storage positions in the relatively aligned and extended positions of the central support members.
Ladders are bulky, cumbersome and annoying but also often necessary. They can also break things, including your head, if you move them around without thinking. You can move ladders safely, serenely and without any shattered skulls if you use the following steps.Make sure the ladder is clear of anything hanging off it, propped against it or stuck on one of the steps or that platform that tells you "This is not a step."Clear the area surrounding the ladder and to which you wish to move the area of any debris. Also clear the pathway in between those two points.Check the height of the ladder versus whats above it to ensure you do not crash it into any ceiling fans, garage overhangs or smoke detectors.If its not folded up already, fold the ladder shut.Grasp each side of the ladder firmly and slowly walk to your destination with the
household step ladders held in front of you or slightly to your side.
The present invention relates generally to the art of ladders and, in particular, to ladders which may be folded to facilitate portability and storage.
As can well be imagined, the design and construction of ladders, in one form or another, may be included among man's oldest technological arts. Notwithstanding centuries of experimentation in this field, however, man has failed to arrive at the "ultimate" ladder: a ladder which may be extended by any number of available sections to reach any desired height; a ladder which may be opened into the "step- ladder" configuration; a ladder which may be stood securely on irregular surfaces or be leaned against an upright surface of any shape without deleterious effect on its stability; a ladder which may be folded to form a single pole which may be easily carried or stored; a ladder which provides non-slip surfaces and human-engineered handrails for safety and convenience of use; and, finally, a ladder which may be manufactured and sold in identical modular sections that can be assembled together to fulfill all of the user's needs, including needs that have never been met before.
It is an object of the present invention to provide a ladder capable of meeting all of the requirements listed above.
This object, as well as other objects which will become apparent in the discussion that follows, are achieved, according to the present invention, by providing a foldable
Aluminum step ladder having at least one section comprising a central elongate member and two outer elongate members arranged one on each side of, and substantially parallel to, the central member; a series of steps each foldably connected to the central member and one of the outer members, each step being arranged to fold between an erected position, in which it extends generally at right angles to the longitudinal direction of each member to which it is connected, and a storage position in which the step lies generally parallel to the central member with the outer member to which it is connected extending parallel to and in close juxtaposition with the central member; and engaging means, disposed on the central member adjacent its upper end, for holding cooperating engaging means of a supporting member. The central and the two outer elongate members thus constitute the three "stiles" of the ladder.
The above construction of the ladder, according to the present invention, permits the central stile to be spaced from a supporting surface by the support member when the ladder section is in a substantially upright, working configuration. For example, the supporting member may be a second ladder section either identical or different from the first, but having also a central stile which may be held adjacent and substantially parallel to the central stile of the first ladder section at a number of extended, partially overlapping positions. The supporting member may also constitute a prop which is pivoted outward from the central stile of the
Aluminum step ladder section to form a generally inverted V-shaped ladder configuration.
source:
townhall|aluminum step ladder by: wenjun
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