FR2543111A1 - BOX - Google Patents

Abstract

ON A TUBULAR BOX BODY 6 PROJECTS, AROUND THE MOUTH, LOCKING MEANS 12 WITH WHICH A HURLET DIRECTS INTO THE INSIDE 11 OF THE COVER 5 COOPERATES TO RETAIN THE COVER 5 ON THE BODY 6. THE BODY 6 IS ROUND AND THE HURLET 11 IS AN ELLIPTICAL FRET SO THAT WHEN A PINCH FORCE IS APPLIED FOLLOWING THE LARGE AXIS OF THE ELLIPTICAL FRET, THE SMALL SHAFT EXTENDS TO UNLOCK THE BODY COVER. THE PRINCIPLE IS ALSO APPLICABLE TO OTHER BODY SHAPES SUCH AS ELLIPTICAL, OVAL AND RECTANGULAR WITH CURVED SIDES.

Description

25431 11

  The invention relates to boxes with removable and restable covers and more particularly, but not exclusively

  to metal boxes with metal lids.

  Containers or metal boxes with a "sliding" cover are well known in which the tubular wall of the

  body defines the mouth of the container and the metal lid

  The sliding frame includes a cover panel which extends

  stretches across the mouth of the container and a skirt which, from the periphery of the cover panel, surrounds

  the side wall of the body so that the forces of rubbing

  due to this "sliding" contact retain the cost

  circle on the box Such a tin container was used

  read for powdered milk and, to retain the lid to

  rubbing reliably, the skirt was very long.

  Such covers were difficult to remove for two reasons.

  sounds: first, the cover skirt had a rough edge that was difficult to grip, and second, the contact

  rubbing was considerable despite the adjustment of the tolerance

cover adjustment rancid.

  We know stamped tin cans for shoe polish

  in which the side wall of the body has a mouthpiece

  chure defined by an hem rolled inwards supported by a peripheral barrel part which ends in a bead directed towards the outside The shallow sliding cover has a cylindrical skirt which bears against the

  barrel part of the body by close fitting contact.

  The fitting contact must be close to avoid

  loss of solvents from shoe polish so that it is covered

  rant to provide on these shoe polish boxes some means to facilitate the removal of the cover placed on the body In a known shoe polish box, a double lever is pivoted

  end, said opening butterfly, to apply pressure

  sion to a hem provided on the skirt of the lid in order to open the box by leverage The making of such levers

  is costly in time and material.

  Patent GB 191,489 describes a box with a sliding cover.

  shallow being in which the marginal annular part of the

  body, against which the hoop of the cover skirt bears

  key, is hollowed out so that the cover can be pressed by diametrical application of pinching forces at the recesses to cause the hoop of the cover skirt to release its friction grip on the annular edge of the body

  so that you can lift the cover off the body.

  However, it is clear that the recesses in the annular edge show gaps in the seal

  between the cover skirt and the body.

  Round tin cans are known in which the shallow sliding cover comprises a closure panel having a peripheral gutter in which is placed a seal in composition

  of inner lining The peripheral skirt of such covers

  keys are hemmed so that its edge is not sharp and

  carries beads directed inwardly to snap under a cooperating bead of the side wall of the box body The primary seal of such a box is

  obtained by vacuum packaging so that the pressure

  pick prevailing in the box attracts the interior coating composition in leaktight contact with a hem provided at the top of the side wall defining the mouth of the container.

  reclosing is ensured by abruptly fitting the fillers

  lets cooperating and for this reclosing to be reliable, the adjustment tolerance must be tightly adjusted, which it can

  however, it is quite difficult to triumph because the cost

  shallow circle offers very little grip and has very little

  elasticity to facilitate abrupt nesting.

  GB patent 1,511,664 describes a box comprising a

  tubular body and a flexible plastic cover.

  The cover has a closure panel extending in

  across the body and a skirt surrounding the entire tubular body

  re Two lugs protrude radially inwards from the skirt under the body To open the box, the skirt is clamped on a diameter perpendicular to the diameter on which the lugs are located, so that when the force of

  pinching locally displaces the skirt towards the body, er-

  gots emerge from the body to allow the cover to be removed

  key along the tubular coros Although such a cover is advantageously molded in plastic material, its design is not economical for sheet metal production because the skirt of the cover would require an unnecessary length of metal to

  laborious packaging and workmanship.

  The difficulties can be summarized as follows:

  sliding long-skirted locks are difficult to open due to the size of the rubbing contact area and cause additional metal expenditure; and short skirted sliding covers require holding means which

  force tight tolerances during manufacturing

  catiôn and can impose additional manufacturing operations

  A lever may be necessary to remove from

  such sealed container lids vacuum packed.

  The present invention provides a box comprising a

  tubular body closed at one end by a cover

  carrying a closure panel and a skirt extending downward from the periphery of the closure panel to surround a

  marginal part adjacent to said end of the tubular body

  re, the cover and the body being held together by cooperating means of the side wall of the body and the skirt

  of the cover arranged so that pinching forces op-

  applied to the skirt separate the cooperating means to allow the cover to be removed from the body, characterized in that the cover is made of sheet metal and in that the skirt ends in a hem directed inwards which can flex under the effect of opposite gripping forces so that, during the application of gripping forces opposite to the cover skirt, the internal circumference of the hem directed inwards is greater than the circumference of the means

  body lock to allow the cover to open

key.

  The cover may be made of any metal of elastic sheets.

  that, a preferred metal being tinplate having undergone a double

  section reduction, said in tinplate loom DR.

  The cooperating locking means of the body can be an annular bead or an interrupted directed bead

  outwards As a variant, the locking means co-

  body operants can be an annular groove in the-

  which can penetrate opposite parts of the hem of the cover. In one embodiment of the box, the hem directed towards the inside of the cover is a locking means in the form of an elliptical hoop capable of cooperating with a

  annular bead directed towards the outside of the wall la-

  tubular teral, said elliptical hoop having a minor axis less than the maximum diameter of the body bead and a major axis greater than the bead of the body by more than double

  the radial height of the bead of the body.

  In another embodiment of the box, the directed hem

  towards the inside of the cover has locking means

  lage in the form of two opposite arcuate locking sections which, in the closed state, embrace the underside of

  a bead directed towards the outside of the body, and two sections

  opposite arching unlocking lessons held outside

  of the bead of the body by connecting sections.

  It is desirable that, when the lid is closed,

  the junction sections maintain each section of junction

  locking outside the bead of the body at a dis-

  minimum radial tance equal to the height of the bead, measured

  radially relative to the body, plus 0.0004 mm.

  We will now describe as examples various

  alizations with reference to the accompanying drawings, in which Figures la and lb schematically illustrate the principle of retention of the cover; Figure 2 illustrates in perspective a first mode of implementation of this principle;

  Figure 3 is a bottom view of a second re-

  alization; Figure 4 is a side elevational view in section along line A-A 'of Figure 3; Figure 5 is a side elevational view in section along line B-B 'of Figure 3; Figure 6 is a perspective view with section and cutaway of a third embodiment; Figure 7 is a side view in diametral section of a fourth embodiment; and Figure 8 is a perspective view of a fifth embodiment in the closed state; Figure 9 is a perspective view of the fifth embodiment in the open state; and Figure 10 is a perspective view of a sixth embodiment in which the cover is shown with

partial removal.

  In FIG. 1a, an ellipse 1 represents a regular set of means for locking a box element, suitable for cooperating with the means for locking another box element represented in the form of a circle. 3 encroachment makes it impossible to do

  cross circle 2 at ellipse 1 by lifting.

  In FIG. 1b, diametrically opposite pinching forces have been applied to the ellipse 1 along its long axis.

  to give it the shape of a circle 1 'of sufficient circumference

  so that we can lift the cereal

  key to the initially elliptical shape so that it can

adorn the box elements.

  In Figure 2 a high box includes a body 4 iron-

  mé at the top by a sliding cover 5 The body has a tubular side wall 6 having a side seam

  (not shown) and a bottom fixed to the tubular side wall

  re 6 by a seam 7 The upper end of the side wall

  line 6 is in the form of an inward-facing hem

  8 which delimits the mouth of the container.

  The cover 5 comprises a closure panel 9, a

  annular gutter part 10 surrounding the iron panel

  meture, and a skirt 13 starting down the periphery of the

  gutter part The skirt 13 has a cylindrical part

  that 14 which fits with play on the body and extends from the gutter part 10 to an annular part flared outwards 15 which ends in a hem directed towards

inside 11.

  The hem 11 is an elliptical hoop capable of cooperating with a circular set of pins 12 projecting from the tubular side wall By applying forces to the cover.

  diametrically opposite toe in, as indicated by arrows

  ches, along the major axis of the ellipse, on which there is a gap between the hem 11 and the pins 12, we deform

  the hoop formed by the hem 11 to give it sensitive-

  ment the shape of a circle of sufficient circumference so that it can be lifted by lifting the cover 5

all 12 nipples in the body.

  Various modifications can be made to this first embodiment, for example incorporating into the gutter part

  a sealant in interior coating composition

  laugh and replace the nipples 12 with a continuous bead in the shape of a circular hoop We can also simplify the shape

  of the skirt as described in connection with a second embodiment.

  Figures 2, 3 and 4 show a second embodiment

  tion of the box comprising a stamped sheet metal body such as a tin with a hardness index of 2 or 3, 0.2 mm thick, carrying a coating of tin E 2.8 on both sides. body has a bottom 17 secured to a side wall 18 The side wall starts around the bottom

  and comprises a lower cylindrical section 19 and a padding

  outward circular let 20, a cylindrical section

  upper plate 21 and a hem directed inwards 22.

  Thanks to the shape and the materials chosen, the body feels

so rigidly.

  The cover includes a closure panel 23, a gutter portion 24 surrounding the closure panel in

  containing a seal 25 in coating composition

  inside and a skirt 26 extending down from the gutter part 24 to end with a hem directed towards 1 '

  interior 27 Hem 27 includes two lock sections

  substantially arched beam 28 which embraces the underside of the bulge

  body reel 20, as best seen in FIG. 4, and two substantially arched unlocking sections 29

  kept outside the bead of the body, as shown

  tee in Figure 5, with a clearance greater than the dimension ra-

  diale of the hem, by connecting sections 30 It is indicated that the clearance is equal to the thickness of the bead plus 2 mm, however a greater clearance is sufficient Each unlocking section extends relative to the center of the cover on

  an angular distance of about 70.

  It is important that the cover is flexible and for this purpose it can be made of a material thinner than the

  body, e.g. 0.17 mm thick DR 8 tinplate

  both an E 2.3 tin coating on both sides

  can obtain flexibility by choosing the hardness of the material

  sheet leaf used, tinplate plates DR (as defined in British standard BS 2920: 1973 and in

  Euronorm 145 78; 150 Rli) have qualities of effect of res-

  desirable fate Soft materials may not exert

  cer the elastic return effect desired for reclosure. In one form, the cover 100 mm in diameter and the skirt 14 mm long, these dimensions allowing tightening between the

  thumb and other fingers to open the box.

  In FIG. 6, a boot comprises a deep-drawn body 31 having a mouth defined by an outer hem 32, and a sliding cover 33 comprising a shallow skirt 34 determined by an hem directed inwards 35 of elliptical shape. It will be noted that the skirt height is very low, demonstrating the influence of the skirt length on the lever arm available when applying forces

  pinching in the direction of the arrows.

  We can overcome this difficulty by providing a

  side wall 36 having a bead directed inwardly

  laughter 77 which defines an external groove and a skirted cover

  longer as shown in Figure 7.

  The sliding cover 23 shown in FIG. 7 works in the same way as the sliding cover

  shown in Figures 3, 4 and 5.

  Alternatively, the outer hem of Figure 7 can be replaced with an elongated hem with an outer surface extending

  next to the tubular side wall until you have

  se of a sufficient hem height to be able to provide on the cover a skirt of sufficient length to make opening 1 However, an elongated hem would require a

metal supplement.

  The invention has been described in connection with round boxes, but this without limitation The principle can be applied,

  for example, in elliptical, oval or rectangular boxes

  tangular with curved sides because, in each case, a compress

  direction following can cause a change of

  shape of the cover for unlocking locking means

  lage arranged transversely to the direction of

application of compression.

  Figures 8 and 9 show an oblong box comprising a body 38 and a cover 39 hinged to the body 38 The body has a bottom 40 and, drawn up from

  around the bottom, two straight side walls oppo-

  sées 41, a straight rear wall 42 and a curved front wall 43 On the front wall protrudes near its top

  an elongated locking bead 44 The walls end

  nent by a hem directed inward 45, continuous.

  The cover includes a top panel 46, two sides

  opposite rectilinear tees 47, a back 48 having knuckles 49 engaged in the rear wall 42 of the body, and a curved front 50 The sides 47, the back 48 and the front end

  all by a hem directed inward 51, continuous The hem-

  let directed inward 51 of the cover is separated by a certain play of the rectilinear side walls 41 of the body when

  the inner hem 51 of the front of the cover is fitted elas-

  tick under the locking bead 44 of the body A suitable clearance between the side hems and the side walls of the

  body would be at least equal to the thickness of the hem

circle 51.

  A pinch force applied inwards to the sides 47 of the cover pushes the hem 51 back into the clearance and bends the front of the cover to unlock the cover hem 51 of the elongated locking bead

  44 to allow the opening of the cover.

  In FIG. 10, an oblong box comprises a rectangular body stamped from sheet metal so as to comprise a first pair of opposite curved sides 52 connected by a second pair of curved sides 53 longer than those of the first pair The sides of the body end with a hem-directed inward 54 Each of the large

  sides has an elongated 55 sail- locking bead

lant on the side wall 53.

  The cover comprises a flat central panel 56 surrounded by a gutter part 57 from which a skirt comprising a pair of short sides 58 and a pair of long sides 59 goes down. The sides 58, 59 end with a hem directed towards the interior 60 which, on the long sides, bears against the underside of the locking bead 55 When the cover

  is closed, hem 60 A on the short sides is now

  bare spaced from the first opposite sides 52 of the body by a clearance at least equal to the thickness of the hem, so that when a pinch pressure is applied to the short sides 58 of the cover, the large sides bend towards the outside to release the hem 60 from the locking bead 54. The gutter part 57 may be provided with a seal, such as an interior coating composition, to establish air tightness with the hem 54 of the body, to which

  case the box is suitable for vacuum packaging for protection

  tion of products such as tobacco and confectionery.

  As the technician understands, the various forms of skirt and the various locking means described in connection with each embodiment may be replaced by means

  equivalent effect of other achievements.

  From the geometric representation given in FIGS. 1a and 1b, it appears that the transformation by deformation

  both of ellipse 1 in a circle and of circle 2 in an ellip-

  will be able to unlock the lid box Although in the packaging industry it is more convenient to provide the rigid box body and the flexible lid, it can

  be indicated in other applications to use a cover

  rigid key and a flexible body For example, the body can play the role of cover or protective means vis-à-vis

  of an element requiring mechanical protection.

Claims (7)

  1 Box comprising a tubular body (4, 31) closed at one end Dar a cover (5, 33) comprising a closure panel (9, 33) and a skirt (13, 23) extending from the closure panel to surround a part edge of the body next to said end of the tubular body, the cover and the body being held together by cooperating means of the side wall of the body and of the skirt so that opposite gripping forces applied to the skirt separate the means cooperating to allow the cover to be removed from the body, characterized in that the cover (5, 33) is made of sheet metal and the skirt (13, 23) ends in a hem directed inwards (11, 28, 35) may bend under the effect of   opposing pinch forces so that during application   tion of the gripping forces opposite to the skirt of the cover, the internal circumference of the hem directed inwards is greater than the circumference of the cooperating means of   body locking to allow the lid to open.   2 Box according to claim 1, characterized in that   that the cover is made of DR tinplate.   3 Box according to claim 1 or 2, characterized in that the cooperating locking means of the body are   an outwardly directed bead (20) or an indented bead overwhelmed (12).   4 Box according to claim 1 or 2, characterized in that the cooperating locking means of the body are an annular groove which can penetrate-parts opposite the hem of the cover.   Box according to claim 1 or 2, characterized in that the hem directed towards the inside of the cover is a locking means in the form of an elliptical hoop (11) arranged to cooperate with an annular bead directed towards the outside. of the tubular side wall, said elliptical hoop having a small axis less than the maximum diameter of the bead of the body and a large axis greater than the bead   of the body from a distance greater than double the height radial torment of the bead of the body.   6 Box according to claim 1 or 2, characterized in that the hem directed towards the inside of the cover has 254311 1   locking means in the form of two opposite arcuate locking sections (28) which, in the closed state, embrace the underside of the bead directed towards the outside   (20) of the body, and two sections of arched locking oppo-   sés (29) held outside the bead of the body by junction sections (30).   7 box according to claim 6, characterized in that when the cover is closed, the connecting sections   (30) keep each unlocking section outside   laughter of the bead of the body at a minimum radial distance   equal to the height of the bead, measured radially with respect to worn on the body, plus 0.0004 mm.   8 Box according to any one of the pre- claims   cédentes, characterized in that a joint seal   inner coating position (25) is fixed to the cover   to come into tight contact with the body.