FR2522544A1 - MACON SIEVES - Google Patents

Abstract

1. Masons's screen comprising a transverse sifting gauze held in a cylindrical peripheral mount provided with an annular groove (12) in which is housed the edge (2, 3) of the sifting gauze, said mount being constituted by two identical half-shells (5, 6) each wound in a semi-circle, characterized in that the two half-shells (5, 6) are identical and assembled together by means of closure devices (7) ensuring connection of the opposite transverse edges of the two halfshells.

Description

The present invention relates to a mason's screen.

  The currently known masonry sieves are made in one piece. They have a circular metal screen cloth which is stretched and nailed in a wooden cylinder. Therefore, each mesh size of the canvas corresponds to a different sieve. These traditional mason sieves have a number of disadvantages First, they involve a very high transport cost because of their large size, this

  congestion proving equally troublesome for

  because of the very large volume that is necessary for their storage. Moreover, because these sieves are transported without being packaged, they undergo

  very often damage during transport.

  The present invention aims to remedy essentially

  these drawbacks by providing a mason sieve of particularly simple design that can be stored

under a small volume.

  For this purpose, this mason sieve with a canvas

  transverse sieving held in a circumferential mount

  Riquecylindrique, is characterized in that it comprises at least one piece of rectangular flexible plastic strip having a longitudinal groove and intended

  to form, by winding on itself, the cylindrical mount

  dries the sieve now, into his then annular throat,

  the edge of the sieving cloth, and iron

  provided on the two transverse edges of the piece of tape and cooperating with one another to ensure the maintenance of the

cylindrical mount.

  The mason sieve according to the invention offers several

  advantages First, it is possible

  to use, with one and the same strip of plastic material

  tick intended to constitute the cylindrical mount

  sieving sieves with different mesh sizes The sieving screen allows a quick change of the sieving wire and saves

  sensitive because each frame can be delivered with several

  Sieving sieves with different dimensions of

my illes at the choice of the user.

  Furthermore, the removable screen according to the invention can be packaged flat, which reduces the volume necessary for its storage of about 83%. This reduced packaging, as well as the small footprint, make it possible to make shipments long and even very long distances, in good conditions of cost and safety Indeed, the various elements constituting the sieve (frame and wire mesh) can be packaged in flat packs

  cardboard protecting them against any damage.

  As will be described below, by way of nonlimiting example,

  FIG. 1 is a partially cut-away plan view of an embodiment of a mason's sieve, the frame of which is shown in FIG. consisting of two half-shells of flexible plastic material; Figure 2 is a half elevational view and half in axial section of the screen of Figure 1;

  FIG. 3 is a partial diametrical sectional view

  the in the joint plane of the two half-shells

  FIG. 4 is a partial diametrical sectional view

  illustrating an alternative embodiment;

  FIG. 5 is a cross sectional view of

  on a larger scale, a device for closing the two half-shafts; Figure 6 is an elevational view of a reinforcement gusset;

  FIG. 7 is a longitudinal sectional view of

  along the line V II I-VII of Figure 6.

  The mason sieve according to the invention which is

  felt on the drawing, includes a sieving cloth metal-

  circular ring 1 whose edge is stretched on a peripheral circle The peripheral ring may consist in fact of two concentric circles of flat iron 2 and 3 between

  which is pinched the edge of the fabric 1, as it is represented

  felt in Figure 3 or still by a single circle 4

  (Figure 4) wire of a section of 4 mm, for example

  In the latter case, the blocking of the sieving cloth on the circle is ensured by a strap crimped on the wire mesh 1 itself wound on the circle 4. This metal sieving cloth 1 is maintained

  in a cylindrical peripheral mount which, according to the

  vention, consists of at least one strip of plastic material

  soft tick wrapping around the sieve 1.

  In the nonlimiting example illustrated in the drawing, this frame consists in fact of two half-shells

  identical 5,6 each wound in a semicircle.

  Each of the half-shells 5, 6 is constituted by a

  piece of plastic tape injected flat.

  Each piece of tape has a rectangular shape and has, by

  for example, a length of 628 mm and a width of 120 mm.

  The two dei-shells 5, 6 are assembled together to form the cylindrical mount, by means of closure devices 7 ensuring the connection of the transverse edges opposite the two half-shells 5, 6 Each closure device is advantageously constituted by two male and female elements, respectively provided at the two opposite ends of each half-shell 5, 6, fitting one into the other and remaining interlocked by elastic locking It is seen for example in Figure 5 that the half-shell 5 has, along its transverse edge, a tongue 8 projecting outwards and that the other half-shell 6 has, along its edge

  opposite, a groove 9 formed in a superstructure

  thickness 10 The tongue 8 is engaged in the groove 9 and retained therein by a portion of the excess thickness 10

  forming an elastic hook 11 All elements constituting

  of the locking device come advantageously

  molding with the remainder of the two half-shells 5 and

6.

  To receive the edge of the screen fabric 1,

  each half-shell 5, 6, presents, at an appropriate distance

  from one of its longitudinal edges, a long groove

  dinal 12 rectannular cross section (Figure 3), or 13 semicircular cross section (Figure 4) The shape of this groove is obviously adapted to that of the circle bordering the

sieving cloth 1.

  During the assembly of the sieve according to the invention, the two half-shells 5 and 6 are wound around the sieving cloth 1 so that the circular edge thereof is housed in the groove 12 or 13 of the two half-shells. shells 5 and 6 The assembly is completed by a

  resilient locking of closure devices 7.

  To strengthen the frame, it can be provided on the outer face of the two half-shells 5, 6 at the location of

  grooves 12, 13, longitudinal gussets 14 also coming

molding.

  Although in the embodiment of the invention which has been described above, the frame is made in two half-shells 5 and 6, 1 is self-evident that this frame could also be made from a single piece of strip of plastic material wound on itself: a

  such a solution then requires the provision of a single

  positive closure 7, to ensure the binding of the transverse edges facing the strip after winding of

  this one around the sieving cloth 1.

Claims (7)

  1. Mason sieves with sieving cloth   cross-section maintained in a cylindrical peripheral mount   jig, characterized in that it comprises at least one piece of rectangular flexible plastic strip (5, 6) having a longitudinal groove (12) and intended for   to form, by winding on itself, the cylindrical frame   that sieve now, in its then annular groove (12),   the edge (2, 3) of the sieving cloth (1), and   fasteners (7) provided on the two transverse edges of the piece of tape and cooperating with one another to ensure the maintaining the cylindrical mount.   Mason sieve according to Claim 1, characterized in that the groove (12, 13) of the strip piece   rectangular section (5, 6) has a corresponding cross-section   to that of the circle bordering the circular sieving (1).   Mason sieve according to Claim 2, characterized in that the edge of the circular sieve cloth (1) is stretched and clamped between two concentric circles of flat iron (2, 3) and the groove (12) of the piece of plastic strip has a rectangular cross section. Mason sieve according to Claim 2, characterized in that the edge of the circular sieve cloth (1) is stretched over a single circle (4) of wire and the groove (13) of the piece of material strip.   plastic has a semicircular cross section.   5. Mason's sieve following any of the   preceding claims, characterized in that each   closure device (7) is of the resilient locking type and has two male and female elements (8, 9) respectively provided at opposite ends of the piece of band, fitting one into the other after formation of the cylindrical mount and remaining embossed by elastic locking. Mason's screen according to Claim 5,   characterized in that the strip of plastic material   which, along one of its transverse edges, has a tongue (8) projecting outwards and, along its   another transverse edge, a groove (9) formed in a sur-   thickness (10), the tongue (8) engaging in the groove (9) and being retained therein by a portion of 5   the extra thickness (10) forming an elastic hook (11).   7. Mason's sieves following any of the   preceding claims characterized in that gushes   molded longitudinal sets (14) are provided on the outer face of the piece of elastic band, at the location of the throat (12,13).