FR2480833A1 - ARTICULATED HEAD FIXTURE FOR ATTIC LADDERS AND ATTIC STAIRS - Google Patents

Abstract

ARTICULATED HEAD BRACKET FOR LADDER AND ATTIC STAIRCASES WITH TWO SUPPORTING ARMS 1 ARTICULATED AT THEIR TWO ENDS; ON THE ONE HAND ON TWO FIXED BRACKETS 2 JOINT TO THE JOIST AND ON THE OTHER HAND, ON TWO SLIDERS 7 ACTING IN PLACE OF A SLIDING RAMP ON THE LADDER OR AT THE SLIDING ATTIC STAIR. ON THE OTHER HAND, ONE OF THE TWO CARRIER ARMS 1 IS IN PLACE OF A STOPPER AUTOMATICALLY RELEASING THE LOCKING RATCHET 10 TO ALLOW THE SLIDING OF THE LADDER OR THE RETRACTABLE ATTIC STAIRS. FINALLY, ONE OF THE TWO SUPPORTING ARMS 1 CAN BE EQUIPPED WITH A HANDLE FOR FOLDING THE LADDER FROM THE UPPER FLOOR.

Description

ARTICULATED HEADREST, FOR LADDERS AND STAIRS

ATTIC ROOMS

  The present invention relates to an articulated head fitting for ladders or attic stairs retractable, articulated on the one hand on the top of the hatch, and on the other hand on a slide on which slides a ladder or a retractable attic staircase. The state of the art proposes - either scales consisting of an upper section hinged to the lower edge of the hatch (bottom of the slab or box) and on which slides or folds one or more lower and / or intermediate sections of 'an equal dimension

  or lower than the upper section.

  This type of ladders or stairs that retracts either in the volume of the hatch or directly on it, has the main disadvantage of requiring a hatch whose length is at

  minimum of the longest run of the ladder.

  - or ladders consisting of an upper section hinged to the upper edge of the hatch (top of the slab or

  box) and on which one or more sections

  longer than the upper section.

  Once retracted, these ladders or stairs rest for part on the floor of the upper floor and for another part above the hatch. The latter type of ladders or retractable stairs has two other major drawbacks: on the one hand, it is common that the radius of clearance required for folding is not available and this because of the configuration of the attic, to the upper floor, with respect to the hatch (near a wall, a beam or the roof) on the other hand, these me scales which are supported on the upper part of the hatch always clutter a part

  of the latter in an unfolded position because of their inclination

necessary.

  In short, it is impossible to equip a hole of 500 m / m x 400 m / m with this type of ladder while leaving the passage

necessary to a man.

  The object of the present invention relates to a head fitting

  articulated for a ladder or attic ladder staircase

  table consisting of two articulated support arms at their end

  upper bracket on two brackets fixed on the upper part of the trapdoor and at their lower end on two slides on which slides the upper section of the ladder

  or the retractable attic staircase.

  The advantages achieved by this invention are - to considerably reduce the size of the ladder or

  the staircase in the hatch, when it is in unfolded position.

  - to allow to fold at will the ladder or the attic staircase retractable on one side or the other of the hatch according to the configuration of the upper floor (wall, roof,

beam, etc ...).

  - to allow the use of all types of ladders or stairs of retractable lofts in a hatch with the smallest dimensions, up to the simple manhole

(400 m / m x 500 m / m).

  In what follows, the invention is explained in more detail in

  using drawings representing a mode of execution.

  - Figure 1 shows, in perspective, an articulated head fitting for ladder or retractable attic staircase with representation of the ladder and the access door

on the upper floor.

  - Figure 2 shows, in side view, the hinged instrument for ladder or retractable attic ladder

mounted on its hatch.

  - Figure 3 shows an articulated half-fitting for ladder or retractable attic staircase and the slide on which slides the upper section of the ladder

or the stairs.

  - Figure 4 shows the process and the possibility of folding the ladder or retractable attic staircase

on one side of the hatch.

  - Figure 5 shows the ladder or the attic staircase

  retractable folded without any overtaking above the ou-

opening of the hatch.

  - Figure 6 shows the process and the possibility of folding the ladder or retractable attic staircase

on the other side of the hatch.

  According to FIGS. 1, 2 and 3, the articulated head fitting for ladder or retractable attic staircase is composed of two support arms (1). These two support arms are articulated around an axis (3) threaded at both ends and resting on two stirrups (2) secured to the joist of the hatch by means of lag bolts (16). The free assembly in rotation of the two support arms (1) of the axis (3) and the two stirrups (2) is

  obtained by means of two nuts (4) and two washers

  fate (5) screwed on the two threaded ends of said axis (3) This last arrangement provides a rotation friction providing the possibility of mantenir the carrier arms (1) in the desired position during the manipulation of the scale

  or the retractable attic staircase.

  According to another feature (FIGS. 2 and 3), a handle (6) retractable along one of the two support arms (1) free to rotate about the axis 3 by means of a nut (4) and a washer (5) and provided with a stop (15) allows the upward pivoting of the two support arms (1) necessary for gripping the ladder or the retractable attic staircase for its folding

from the upper floor.

  Still according to FIGS. 2 and 3, the other end of the two support arms (1) is articulated on two sliders (7) by means of

two screws (8) and their nut (9).

  These two slides (7) take the place of slide at the section

  upper ladder or retractable attic staircase.

  An abutment (13) fixed on the end of the upper section of the ladder or retractable attic staircase prevents this

  last to leave the slider (7).

  A stop (14) adjustable in height on the upper section of the ladder or the retractable attic staircase comes to limit

  the stroke of the said section during folding.

  Still according to FIG. 2, a pawl (10) makes it possible to immobilize the

  upper section of the ladder or attic staircase

  table on the slider (7). This ratchet (10) free in rotation pivots under the effect of its own weight around an axis (11) and

has a lug (12).

  Folding and unfolding the ladder or attic stairs

  retractable is carried out according to the following procedure.

  - Figure 4 illustrates the process of folding the side of the two stirrups (2) fixed on the upper part of the joist. In position

  At the sections of the ladder or attic staircase

  table are superimposed and blocked between them.

  By lifting the ladder, thanks to the pawl (10) abutting on the slider (7), Figure 2, the articulated head fitting will pivot upwards to move from position A to position B. In position B, pin (12) bears on the support arm (1) and releases the ratchet (10) allowing the sliding of the ladder

the on the slider (7).

  The extension of this sliding, followed by a tilting of the ladder or the retractable attic staircase, makes it possible to pass from the position B to the position C. - Figure 5 shows a possibility of retraction of the ladder or the attic staircase without any overtaking above the hatch. The user has the possibility to move from position C,

  shown in FIG. 4 at position I (FIG.

  slipping accordingly the abutment (14) which limits at will the cour-

sliding.

  FIG. 6 illustrates the process of folding the ladder or retractable attic staircase on the opposite side to the two

stirrups (2).

  By lifting the ladder, gravel ratchet (10) abutting on the slide (7) the articulated head fitting pivots upwards to move from position D to position E. In position E, the ratchet (10) pivots under his own weight and

releases the slide (7).

  The sliding at will then becomes possible to move from the position E to the position F.

  Finally the user has the possibility to fold the ladder or the

  retractable granary attic from the upper floor following the

following procedure.

  - pull the operating handle (6) until the stop (15) comes to rest on one of the two support arms (1) of

the articulated head fitting.

  said head fitting then pivoting upwards allows the user to catch the upper section of the ladder or

from the stairs.

  the user then has the possibility of folding his ladder either in position C (FIG. 4) or in position I (FIG. 5) or in position F (FIG. 6). 1

Claims (5)

R E V E N D I C A T I 0 N S   1. Articulated head fitting for ladders and stairways   with two support arms (1) pivoted   both on an angle of 2700, characterized in that the two   ends of said carrier arms are respectively articulated   on the one hand on the two fixed stirrups (2) secured to the joist and on the other hand on the two slides (7) serving as a sliding ramp at the upper section of the ladder or   from the retractable attic staircase.   2. Hinged head fitting for ladders and attic stairs retractable according to claim 1, characterized in that the length of the support arms (1) is less than the   length of the hatch and greater than the length of the sliders   buckets (7) such that the ladder or the attic staircase   retractable can be folded in the rest position indifferently   on one side or the other of the hatch. This particular arrangement allows to equip a ladder or a retractable attic staircase smaller hatches, to the simple manhole, even if the proximity of an obstacle   (wall, beam, roof, etc ...) prohibits the accommodation of the ladder   the attic staircase or retracted on the crowded side.   This particular arrangement also allows the retraction   complete for all types of ladders or escalators   tables without exceeding the point of articulation   stirrups integral with the joist.   3. Articulated head fitting, for ladders and escutcheons   tables according to claim 1, characterized in that the two support arms (1) are of a length greater than the thickness of the hatch so that the size of the hole of the hatch by the ladder or the retractable staircase unfolded is reduced to a bare minimum so as to leave the maximum of   place for the passage of the user.   4. Articulated head fitting for ladders and stairways   nier retractable according to claim 1, characterized in that one of the two support arms (1) serves as a stop for the pin (12) thus automatically releasing the pawl (10) for sliding the ladder or of   the retractable attic staircase on the slides (7).   Articulated head fitting for retractable ladders and attic stairs according to claim 1, characterized in that one of the two support arms (1) can be equipped with an operating handle (6) allowing the user to bend   the ladder from the upper floor.