fig1 to 3 show a case 1 according to the invention which includes a lid 2 and a base 3 molded in rigid material connected along a hinge 4 . the closure device of the case 1 consists of two elements , i . e . an element 5 forming a hook which is disposed on the edge of the lid 2 opposite the hinge 4 and an element forming a counter hook 6 which is disposed on the edge of the base 3 opposite the hinge 4 so that it can cooperate with the element forming the hook 5 . the element 5 consists of two parts , i . e . a support 7 which is molded in one piece with the lid 2 and which is consequently made of rigid material and an elastic component 8 which carries a catch 9 of the hook 5 . the support 7 consists of two lugs 10a and 10b connected by a reinforcing rib 11 which is integral with the bottom of the lid 2 . the lugs 10a and 10b have a cross section in the shape of a rectangle except at their free ends where the lugs 10a and 10b carry a projection 12a , 12b having a longitudinal section in the shape of a right - angled triangle , the point of the right angle being opposite the bottom of the lid . the elastic component 8 is a parallelepipedal casing in which a cavity 13 having the shape of the support 7 is formed . the catch 9 is disposed on the front face of the component 8 and it projects towards the exterior . the counter hook 6 consists of the edge of a groove 15 formed in the wall of a recess 14 . when the case 1 is closed ( see fig2 ), the hook 5 is housed in the recess 14 , the catch 9 cooperating with the edge of the groove 15 and being held by the upper edge ( in the position shown in fig2 ) of this groove 15 . when the user wishes to open the case 1 , he exerts a force on the closure device tending to separate the lid 2 from the base 3 at the closure . under the action of this force , the elastic catch 9 is deformed until the catch 9 is freed from the groove 15 and , consequently , the hook 5 is freed from the counter hook 6 . when the user closes the case 1 again , the catch 9 of the hook 5 moves aside by deformation and then is housed in the groove 15 . the subsequent figures show variants of closure systems according to the invention . in these figures , the same arrangements or components carry the same reference numerals increased by multiples of 100 . fig4 is an exploded perspective view of a hook 105 consisting of a support 107 and an elastic component 108 carrying a catch 109 . the support 107 has the same shape as the support 7 shown in fig1 to 3 , except that the reinforcing rib 111 is not integral with the lid 102 . the component 108 is a parallelepipedal casing open on its upper face ( in the position shown ). a cavity 113 is formed in the casing 108 and is also parallelepipedal in its entirety , except that beading 116a , 116b is provided to hold the projections 112a and 112b of the lugs 110a , 110b molded in one piece with the lid 102 . fig5 shows a variant of the hook 105 of fig4 . according to this figure , a hook 205 consists of a support 207 similar to the one shown in fig1 to 3 , except that the projections 212a and 212b of the lugs 210a and 210b have a longitudinal section in the shape of a right - angled trapezium , the small side of the trapezium having a length slightly greater than the thickness of the wall of the elastic component 208 . the elastic component 208 , like the component 108 of fig4 consists of a hollow casing including a parallelepipedal cavity 213 . two openings 217 for the passage of the projections 212a and 212b of the rigid support 207 are formed in the lateral walls 208a , 208b of the casing , just above the wall forming the base . a rectangular tongue 218 carrying the catch 209 is provided in the front wall 208c of the casing . this gives greater flexibility of the catch of the hook 209 , thereby facilitating opening and closure of the case . fig6 is an exploded view , partly in section and partly in a front view , of a hook 305 the support 307 of which consists of two lugs 310a and 310b provided with two projections 312a and 312b facing one another . the elastic component 308 is of generally parallelepipedal shape and carries a catch 309 . two passages 313a and 313b having a shape complementary to that of the lugs 310a and 310b , except for the necessary clearance , and bordered by the lateral walls 308a and 308b are formed in the component 308 . fig7 is an exploded view of a hook 405 which consists of a support 407 including two lugs 410a and 410b connected by a rib 411 integral with the lid 402 shown vertically here . the lugs 410a and 410b are provided at their ends with triangular projections 412a and 412b respectively facing one another . the elastic component 408 consists of a plate 419 on the upper face of which the catch 409 is disposed . two fixing lugs 420a and 420b , each in the form of a right - angled bracket , are disposed on the lower face of the plate 419 , one of the sides of each bracket 420a and 420b being parallel to the plate 419 and the other being perpendicular to the plate 419 . these brackets form two rectangular spaces 421a and 421b , each space 421a , 421b having cross - sectional dimensions equal to the dimensions of the lugs 410a , 410b outside the projections 412a and 412b . these project beyond the component 408 when the latter is mounted on the support 407 . the component 408 is thus fixed to the support 407 with the aid of fixing lugs 420a and 420b and projections 412a and 412b . in this embodiment , the catch 409 is situated over a flexible zone of the plate 419 facilitating the operation of the catch 409 in cooperation with the corresponding counter hook . fig8 and 9 show an embodiment of a hook 505 consisting of a support 507 molded in one piece with the lid 502 and an elastic component 508 carrying the catch 509 of the hook . the support 507 consists of two lugs 510a and 510b carrying two projections having a triangular longitudinal section 512a , 512b directed towards the exterior . the lugs 510a and 510b are connected to one another by a reinforcing rib 511 integral with the lid 502 . the component 508 is a parallelepipedal casing , the rear face 508d of which ( in the position shown in fig8 and 9 ) is open , this opening extending as far as the front wall 508c by openings 517a , 517b at each of the corners between the lateral walls 508a and 508b and the front wall 508c . the openings 517a , 517b have dimensions such that the projections 512a , 512b can penetrate therein and hold the component 508 by clipping , as shown in fig9 on the edges of the openings 517a , 517b defined by the lateral walls 508a , 508b . a rectangular opening 522 traverses the component 508 at right angles with the catch 509 and gives greater elasticity to the hook 505 at the catch 509 . fig9 shows this elasticity being used to advantage during the operation of the closure device . fig1 shows an elastic component 608 which can be used with the support 507 shown in fig8 . this component 608 is similar to the component 508 shown in fig8 and 9 , except that the flexibility of the hook at the catch 609 is obtained by a tongue 618 cut out of the upper wall 608e of the component 608 and carrying the catch 609 . fig1 shows a hook 705 consisting of a support 707 of rigid material and an elastic component 708 carrying the catch 709 . the support 707 includes two lugs 710a , 710b connected by a rib 711 integral with the lid 702 . the lugs 710a , 710b have a cross section which gradually decreases from the rib 711 towards their free ends . an outer lateral notch 723a , 723b is formed at the reinforcing rib 711 in each of the lugs 710a , 710b . the elastic component 708 is a hollow prismatic casing . the lateral faces 708a and 708b converge slightly towards the front wall 708c . they are provided internally on their edges opposite the lid 702 with beading 724a and 724b . a front cutout 722 of generally rectangular shape is formed on the front wall 708c . the catch 709 is thus disposed on the flexible upper wall limiting the opening 722 of the component 708 . fig1 shows a hook 805 consisting of a rigid support 807 and a flexible component 808 . the rigid support 807 includes two lugs 810a , 810b connected at one of by a reinforcing rib 811 which is integral with the lids 802 . the free ends of the lugs 810a , 810b carry a projection 812a , 812b , the two projections facing one another . the elastic component 808 consists of a plate 819 provided on its lower face with two lugs 820a , 820b in the form of a right - angled bracket forming a space 821a , 821b opening laterally towards the exterior . this space has dimensions such that the lugs 810a , 810b can be introduced therein , the projections 812a and 812b being disposed on the front edge of the lugs 820a and 820b so as to fix the component 808 by clipping to the lugs 810a , 810b . the catch 809 of the hook 805 is disposed on a tongue 818 formed on the front edge of the plate 819 . fig1 and 14 show an embodiment of a variant of the hook 805 of fig1 . in the elastic component 908 , the lugs 920a , 920b each include an angle return , the two returns facing one another , and are disposed on the lower face of the plate 919 . the catch 909 of the hook is fixed to a tongue 918 . the lugs 910a , 910b of the support 907 include lateral projections 912a , 912b facing one another . fig1 shows a hook 1005 consisting of a support 1007 including two cylindroconical lugs 1010a and 1010b molded in one piece with the lid 1002 . on each lug 1010a , 1010b , the diameter of the conical part at its junction with the cylindrical part is greater than the diameter of the cylindrical part so as to form a collar 1024a , 1024b defining around and at the ends of the cylindrical parts a flat bearing surface opposite the lid . the elastic component 1008 consists of a plate 1019 carrying the catch 1009 of the hook . two cylindrical spaces 1025a , 1025b are provided under the face of the plate 1019 at each of the ends of the plate 1019 . the lugs 1010a and 1010b slip into the spaces 1025a , 1025b like into the fingers of a glove , the clipping collars 1024a and 1024b holding the component 1008 relative to the support 1007 by bearing against the flat bearing surfaces of the lugs 1010a , 1010b on the front face of the component 1008 . fig1 shows a hook 1105 consisting of a rigid support 1107 and an elastic component 1108 . the rigid support 1107 consists of two cylindroconical lugs 1110a and 1110b similar to the lugs 1010a , 1010b of fig1 . the component 1108 consists of an endless belt 1119 which can be straddled over the lugs 1110a and 1110b . the belt 1119 carries the catch 109 of the hook on its front edge ( in the position shown in fig1 ).
case including a lid and a base provided with a closure having a hook and a counter hook cooperating to close the case . the hook includes a rigid support on the lid to which an elastic component carrying the catch of the hook is mounted . the elastic component deforms upon opening and closing to engage and disengage , respectively , the catch and counter hook .