Classifications

• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06C—LADDERS
  • E06C1/00—Ladders in general
  • E06C1/02—Ladders in general with rigid longitudinal member or members
  • E06C1/14—Ladders capable of standing by themselves
  • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06C—LADDERS
  • E06C1/00—Ladders in general
  • E06C1/02—Ladders in general with rigid longitudinal member or members
  • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
  • E06C1/381—Ladders with rungs or treads attached only to one rigid longitudinal member
• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06C—LADDERS
  • E06C1/00—Ladders in general
  • E06C1/02—Ladders in general with rigid longitudinal member or members
  • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
  • E06C1/39—Ladders having platforms; Ladders changeable into platforms
• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06C—LADDERS
  • E06C1/00—Ladders in general
  • E06C1/52—Ladders in general with non-rigid longitudinal members
  • E06C1/54—Ladders in general with non-rigid longitudinal members of the lazy-tongs type

Definitions

• the present invention relates to an expandable ladder, folding with a single central amount.
• telescopic or extendable ladders designed to be collapsible so that they are compact in order to facilitate their transport in vehicles or so that they can be stored in small spaces.
• One of the well known principles is that based on the structure of several segments arranged in series of parallelograms, allowing to develop in an expandable geometry. It is for example on this principle that base patents No. 3265155, No. 3004624, No. 2798653: the two amounts consist of a set of segments articulated together to form a series of parallelograms that can be deployed. In some cases each amount is itself made up of two adjacent structures with very many parts.
• the essence of the present invention is to simplify very significantly the concept of scale by building the kinematics in parallelograms around a single central upright, offering many advantages: having a very pure kinematics so without risk of jamming, having the minimum of parts to limit the cost of implementation, have a deployed configuration as rigid as possible, and finally have a folded configuration as compact as possible.
• Scale object of the present invention is generally consisting of a single main amount located in its plane of symmetry, a set of bars, support pads at both ends, a safety lock.
• the Fig.l front view, Fig.2 side view, Fig.3 side view with bars equipped with steps, show the ladder in fully deployed position, most commonly used configuration.
• Fig.4 shows the scale in fully folded position in storage configuration.
• Fig.5 shows a detail of the first rung and the last rung of the ladder with its telescopic system to remove the supports.
• FIGS. 6 and 7 show details of the different cases of articulation between the segments of the uprights: the hinge situated in the front part having a simultaneous pivot and bar function, the hinge located in the rear part having a simple pivot function.
• Fig.8 shows the possible use of the expandable ladder to achieve a height adjustable table leg.
• Fig. 9, Fig. 10 and Fig. 11 show the possible use of the expandable ladder to make a complete table with adjustable height.
• Fig. 11 shows a possible transformation of the expandable ladder into an expandable ladder.
• the amount Rep.1 is made from metal profiles of light alloy or possibly any other lightweight material such as composites or plastics. It consists of a set of segments Rep.2 and adjacent segments Rep.3 of the same length. Each segment and its corresponding adjacent segment are articulated together in their middle. Two consecutive segments are articulated at their end. The distances between two successive joints are all identical.
• the bars Rep.4 of the scale can be made from cylindrical tubes. They are situated either at the level of the median articulation of two segments facing each other, or at each articulation of two successive segments located on the front face of the scale as shown in FIG. The joints between two successive segments located at the rear of the scale do not have a bar as shown in Fig.7.
• Each bar Rep.4 is fixed in the middle in the segment Rep2 by gluing, welding or any other fastening means. It is articulated in the adjacent segment Rep.3 having a rotating guide spacer Rep.
• a retaining ring Rep.6 ensures the transversal retention of the assembly.
• the last lower bar is connected to a support element while the last upper bar is connected to a wall support element to ensure the stability of the ladder.
• these elements can be made simply by two axes Rep.7 provided at the ends of a bearing pad Rep.8. These axes can slide inside the bar in order to be deployed for the use phase of scale or retractable in order to reduce congestion during the storage phase.
• each of the bars could be equipped with a rep.12 step with a flat surface as shown in Fig.3.
• the implementation of the scale is simple: the parallelograms are deployed manually, until the maximum extension is reached, that is to say until each of the consecutive segments bears on their field.
• the retractable hook Rep.l 1 is folded down on the bar to lock the assembly.
• the support pads Rep.8 are deployed laterally and then locked in position by tightening the pressure screws Rep.10.
• the implementation is carried out in the reverse sequence.
• the scale can be partially deployed as shown in Fig.8 to achieve a height-adjustable table leg. In this case the locking hooks Rep.l 1 are locked on the bars in an intermediate position provided for this purpose.
• Fig. 1 2 the invention can be simply declined in an extensible step ladder that can be made from an extensible scale which would remove one of the articulated links located in the middle of the scale and the stability of which would be ensured by means of two Retr.11 retractable hooks and a stabilizer bar Rep.13.

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• Ladders (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=35478935

Family Applications (1)

Country Status (4)

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Citations (2)

Family Cites Families (4)

• 2005
  • 2005-05-13 FR FR0504809A patent/FR2885642B1/fr not_active Expired - Fee Related
• 2006
  • 2006-04-21 WO PCT/FR2006/000884 patent/WO2006123027A1/fr not_active Ceased
  • 2006-04-21 US US11/914,265 patent/US20080190698A1/en not_active Abandoned
  • 2006-04-21 EP EP06755437A patent/EP1880074A1/de not_active Withdrawn

Patent Citations (2)

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