referring now to the drawings , wherein like reference numerals designate identical or corresponding parts throughout the several views , fig1 shows a make - up case with a general reference numeral 1 , which has an elliptical shape in cross - section along line 1 - 1 &# 39 ;. the case 1 has a lid 2 pivotally mounted on the body 5 by means of a securing film hinge 6 . the body 5 and the lid 2 are made of a rigid plastic material . a clasp 2c ensures the closure of the lid 2 on the body 5 of the case 1 . in fig2 the body 5 comprises at its center a cylindrical opening 3 , traversing the thickness of the body 5 from side to side . the opening 3 is closed by a flexible bottom 4 comprising a corrugated membrane 4a made of a flexible and resilient material such as a silicone sheet . the flexible bottom 4 and the internal sides of the body 5 ( or sides of the opening ) define a variable volume compartment . the membrane 4a is secured to the lower surface 5a of the body 5 by means of an annular ring 4c . on the flexible membrane 4a , there is mounted a piston 4b movable in translation ( along arrows f1 and f2 ) comprising a central finger 4d wedged in the central valley of the membrane 4a using the press - stud principle . the membrane 4a is resilient , allowing it to return to its initial position after having been displaced towards a screen 9 . an annular bead 5c situated in the vicinity of the screen 9 limits the travel of the piston 4b . the piston 4b supports a polyurethane foam slab 7 , with open cells having a pore diameter of approximately 0 . 5 mm , in contact with the powdery product 8 . with a view toward facilitating the use of the case 1 , the lower surface 5a of the body 5 is at a level at least equal to that of the flexible bottom 4 . on its internal side 2a the lid 2 may comprise a mirror 2b . the screen 9 , optionally comprising a flock coating , is fixed at the upper portion and at the periphery of the opening 3 of the body 5 by means of a folded back edge 10 of a fixing frame 11 . the edge 10 constitutes a sealing means between the body 5 and the product compartment . the screen 9 is situated at a level slightly lower than that of the upper surface 5b of the body 5 of the case 1 and at a distance from the upper surface of the powder 8 . the frame 11 is rigid and constituted by the same material as the body 5 ; it is fixed by means of a bead - and - groove catch engagement system 19 to the circumference of the upper surface 5b of the body 5 . the frame 11 participates at the same time in holding the screen 9 and in sealing the case 1 , and in particular the lid 2 , with respect to the powder 8 . the frame 11 has an opening 11c which allows access to the product 8 . a puff 12 comprising a flock coating 12a rests on the frame 11 . the puff 12 permits the take - up of the powder 8 and completes the seal of the case with respect to the powder 8 in the closed condition of the case 1 . an internal edge 11a of the frame 11 allows the puff 12 to be raised , so as to avoid contact of the puff 12 with the screen 9 in the closed position , and to ensure the seal of the case 1 . an annular depression 11b formed in the frame 11 makes it possible to receive a peripheral bead 12b of the puff 12 , having a shape complementary to that of the depression 11b . to take up a quantity of the powder 8 , the user holds the case in one hand and presses ( arrow f2 ) by means of her fingers on the flexible bottom 4 and more particularly on the membrane 4a . with the other hand , she exerts pressure ( arrow f1 ) on the powder 8 by means of the puff 12 . she thus exerts two opposing pressures f1 and f2 on either side of the case respectively directed towards the bottom and towards the top of the case . the force f2 is communicated to the screen 9 , via the movable piston 4b and the foam 7 . thus these two pressures are exerted on either side of the screen 9 while the screen remains fixed relative to the side walls of the body 5 . the upward pressure f2 permits moreover the ventilation of the powder and its delivery to the screen 9 . the downward pressure f1 exerted by means of the puff 12 , allows powder to be taken up on the puff 12 . once the powder has been taken up , the user again closes the case 1 . the foam slab 7 , the piston 4b , and the flexible membrane 4a reassume their initial position . moreover , the seal of the case is again ensured until a subsequent use . the seal is ensured , inter alia , by the position of the puff 12 which surmounts the screen 9 , without however coming into contact with the screen 9 . the case of fig3 differs from that of fig2 in that it has a receptacle or refill 13 for the product , constituting a product refill accommodated in the opening 3 of the body 5 and having a shape complementary to that of the opening 3 . the refill 13 is represented in greater detail in fig4 . the refill 13 has a flexible bottom 4 formed by a flexible membrane 4a made of a thermoplastic elastomer in a twin injection molding process , joined to a rigid cylindrical skirt 14 having an upper peripheral flange 15 . the flange 15 has a folded back edge 15a allowing it to be fixed on the case 1 by means of a corresponding annular groove 10a on the upper surface 5b of the case . a detachable cover 16 protects the product before the first use of the refill and between successive uses . optionally , the membrane 4a may comprise a central reinforcing element 4f , which is more rigid than the peripheral zone of the membrane 4a , serving for the gripping of the case . in this embodiment , the flexible bottom 4 and the internal sides of the skirt 14 of the refill 13 define the variable volume compartment . the refill 13 contains the piston 4b supporting the foam slab 7 , as well as the powder 8 and the screen 9 . the piston 4b is joined to the membrane 4a by a central finger 4d in a press - stud system . as in fig2 the fixing frame 11 of the case comprises an internal edge 11a allowing the puff 12 to be raised up relative to the screen 9 . the frame 11 completes the fixing of the refill 13 by accommodating the flange 15 of the refill 13 sandwiched between the upper 5b of the case and the frame 11 . in fig5 the body 5 has a movable bottom 4e constituted by a rigid material such as a plastic material . the bottom 4e is slidably mounted in an annular compartment 20 formed at the lower surface 5a of the circumference of the body 5 . an annular shoulder - and - stop system 21 allows the movable bottom 4e to be held in position in the body 5 . if required , the bottom 4e may be covered by a non - slip material . a refill 13 is accommodated in the opening 3 of the body 5 . the refill 13 has a membrane 4a which is in contact with the movable bottom 4e and which is elastically deformable so as to constitute means for restoring the bottom 4e . the membrane 4a cooperates with the piston 4b and the foam slab 7 so as to displace the powder 8 towards the screen 9 when the product is taken up . a wooden frame 11 supporting a puff 12 is fixed to the upper surface 5b of the body 5 . obviously , numerous modifications and variations of the present invention are possible in light of the above teachings . it is therefore to be understood that within the scope of the appended claims , the invention may be practiced otherwise than as specifically described herein .
a case for a product in a powdery or semi - fluid form includes a rigid body , and a flexible bottom . the rigid body and the flexible bottom define a variable volume compartment for containing the product . the case also includes a fixed screen which is capable of allowing the product to pass during simultaneous pressures on the flexible bottom and on the screen . the product can be a make - up or skin care powder . the flexible bottom can be formed by a flexible membrane , by a piston and / or a foam slab .