FR2617944A1 - IMPROVEMENT ON THE BRIDGES - Google Patents

Abstract

Easel characterized in that it is equipped with two double-compasses which, under the effect of a simple pressure, make it possible to obtain automatically and simultaneously the deployment and the blocking of the feet, while conferring great stability. According to another arrangement, the easel can be assembled in pairs, by means of a spring and a pin. A gripping handle is provided so as to facilitate the transport of this pair of trestles thus coupled.

Description

There are different models of easels to support a plan

  of work, or an object to be worked on.

  These easels consist of a crossbar with fixed feet folded

  foldable or removable, in order to facilitate transport in a vehicle. Several embodiments of this type of material are known and are the subject of the patents referred to below:

  French Patent No. 1,246,304 describing a metal trestle with concave feet

  tables and automatic opening under the action of a spring.

  French Patent No. 2.487722 describing a folding trestle composed of two

  bent tubes, articulated around an axis and blocking between them-

with the opening.

  French Patent No. 2.291329 describing a trestle consisting of a vertical frame on which are articulated struts acting as a

  feet, maintained in spacing by rods themselves hinged.

  French Patent No. 2,220,661 describes a trestle whose feet are foldable

  externally along the transom.

  French Patent No. 2,441,8062 describing a dismountable trestle in separate elements. French Patent No. 2,395,112, describing a non-collapsible trestle equipped

  of casters and can receive a tray.

  Patent No. 2.404722, addition to the patent No. 73.09643 describing a trestle whose feet are removable and can be nested in boxes

integral with the cross.

  French Patent No. 1.504664 discloses a telescopic claw trestle.

  Brevez Francais nc 2.454877 describes a trestle with articulated feet

come stuck a cross.

  U.S. Patent No. 84/03347, discloses a work easel whose feet are

  Removable and held by straps during transport.

  French Patent No. 2,389,351, describes a folding easel made of frames

tubular articulated between them.

  French Patent No. 2,515,242 describes a trestle hinge constituted

two articulated frames.

  French Patent No. 2,478,782 discloses a removable metal trestle.

  French Patent No. 2,443,931 describes a trestle whose feet are folded

ble.

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  French Patent No. 2,222,333 describes a safety hinge for folding trestle. The present invention aims to provide improvements to these different models of easels, so as to facilitate their storage and transport, to simplify their deployment during implementation

  for use and to increase their rigidity and stability in this posi-

working conditions.

  The first improvement obtained is that the feet are

  bend inside the U-shaped crossbar and, consequently,

  facent completely thus achieving a compact product.

  This improvement is obtained thanks to articulated feet on an axis and

  connected to a cross by the conjugation of two compasses arranged in Té.

  The feet are folded side by side on the inside of the U-shaped crosspiece, operation facilitated by the axial position of the compasses relative to

  to the travere and by the design of their mode of folding.

  The second improvement concerns the deployment of the feet whose execution is simple and fast thanks to the conjugated compasses. Indeed, a locking action exerted on the part of the compass acting as a strut ensures simultaneously the transverse spacing and the locking in

position of articulated feet.

  Another improvement relates to the increase of rigidity and stability of the feet in the deployed position, this thanks to an axis acting as a stop, thus limiting the opening of the feet and opposing the thrust exerted

  by the part of the compass acting as a leg of force.

  The transport and the storage are facilitated by a fourth improvement which makes it possible to join the pair of trestles face to face, solidarisation

  obtained by means of a spring which engages, because of its elasticity

tee, around a pin.

  The pair of easels thus paired can be stored easily, all taking the form of a tube of rectangular section. Manual transport is then very easy thanks to a handle attached to a wing

  profile U forming the cross of one of the easels.

  The invention is described below in more detail with the aid of illustrated drawings.

  feeling only one mode of execution.

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  FIG. 1 shows, in perspective, an unfolded easel in use position, composed of a cross-piece 1 on which are articulated around

of an axis 4, feet 2 and 6.

  The spacing and the rigidity of the feet are obtained by means of a double compass of which we distinguish the two parts 3 and 8 acting of

blocking knee pads.

  2 shows, in perspective, the bridge in the folded position

  with the feet 2 and 6 completely retracted inside the profile U con-

tilting the crossbar 1.

  FIG. 3 represents, in perspective, a pair of trestles paired by clipping, the assembly then constituting a tubular product.

  whose handling is facilitated by the handle 15.

  FIG. 4 and FIG. 5 represent the assembly of the feet 6 of the

  crossbar 1 and double compass 3 and 8.

  One end is articulated on the crosspiece 1 about an axis 16. This point

  articulation is located in the axis of symmetry of the crossbar 1.

  The other end of the same part 8 of the compass is articulated on an axis 17 carried by a bracket 7, itself hinged on the part 3 of the compass

around axis 18.

  According to FIGS. 4 and 6, the part 3 of the compass articulated in its middle about the axis 18, is also at each of its ends, on the foot 6 around

  of the axis 19 on the foot 2 around the axis 20.

  The blocking and the separation of the feet 2 and 6 are obtained by exerting a manual pressure, from top to bottom, in the zone of the axis 21 of the part

8 of the compass (Figure 4).

  This thrust causes the deployment of the part 3 of the compass (Figures 4 and 6) which, by its action, through the axes 19 and 20, makes

spread feet 2 and 6.

  The vertical manual pushing action on axis 21 of part 8 of the

  not causes the deployment of said compass, simultaneously causing a reaction force of the axis 16, forcing the feet 2 and 6 to rotate around

  of the axis 4 to abut on an axis 5 limiting the pivoting.

  The portion 8 of the compass is then bent around its axis 21 cooperating with a stop 9, to obtain a blocking conferring a high rigidity

  and easel stability in working position.

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_ 4 _

  FIG. 6 represents the feet 2 and 6 hinged about the solid axis 4.

re of the crossbar 1.

  The feet 2 and 6 deployed take an oblique position thanks to oblong holes made in the longitudinal direction dahs said feet crossed

by the axis 4 (Figure 6 A).

  According to FIG. 7, when the feet 2 and 6 are deployed, the spring 13

  mounted on the axis 4 is in the rest position.

  According to FIG. 8, when the feet 2 and 6 of a pair of trestles are folded and housed in their respective U-shaped transoms 1, this same

  spring 13, equipping one of the two trestles comes to engage automatically-

  on a pin 14 on the other bridge. The pair of trestles then forms a single block equipped with a handle 15 (see FIG.

his grip and his transport.

  1. A bridge comprising a cross member and locking feet, characterized in that the upper end of the portion 8 of the double-compass, arranged in a tee, is articulated at a point situated in the symmetrical axis of FIG. the inner face of the cross, while its other lower end is articulated on a bracket 7, itself secured to the other part 3 of the double compass, itself articulated at each of its two ends

on feet 2 and 6.

  This design and arrangement of the double compass makes it possible

  simultaneously hold on a single pressure exerted on the part 8 of the double compass (acting as a strut), the deployment

and the blockage of the feet.

  2. Easel according to claim 1, characterized in that it comprises an axis 5 in lieu of abutment, intended to limit the opening of the feet

  while forming a reaction to the thrust exerted on Part 8 of the

  compass acting as a strut. This peculiarity confers

  to the whole a greater rigidity.

  3. Easel according to claim 1, characterized in that it can be secured in pairs through the combined action of a spring 13 and a

pin 14.

  4. Easel according to claim 3, characterized in that the pair of

  easels thus assembled is equipped with a handle 15.