FLUID DISCHARGE MECHANISM

Abstract: A fluid discharge mechanism comprises a fixed plate with a hollow cylindrical piston which has a closed valve on the upper wall. A pressure plate is provided with a hollow cylinder which has a closed valve on the upper wall, and fitted slidably around the piston. A storage chamber is secured to the lower side of the fixed plate, storing a fluid and composed of a soft material. The pressure plate is urged upward by a resilient member between the pressure plate and fixed plate, in such a manner that the pressure plate can be pressed down. The pressure plate is pressed down, and then released from the pressing force to cause the fluid in the storage chamber to be discharged to the outside of the upper surface of the pressure plate.

Description: TECHNICAL FIELD OF THE INVENTION This invention relates to a fluid discharge device which permits various kinds of viscous fluids to be held in a storage chamber formed of a soft material and discharged efficiently to the outside, and more particularly to a fluid discharge device capable of discharging fluid reliably from a storage chamber to the outside, a suitable quantity at a time, by a simple pressing operation and being made without requiring any complicated construction, with a high productivity and at a low cost and with containers of various shapes. The fluid discharge device according to the present invention is suitable for, especially, cosmetics, such as foundation, lip color, cream and cosmetic liquids, and can also be used for to various kinds of viscous fluids, such as paste, paint, and mustard. BACKGROUND OF THE INVENTION Japanese Utility Model Publication No. 42-13648 published in 1967 discloses a fluid discharge device of the type described above. The fluid discharge device disclosed in this publication has a quantitative suction chamber at an opening of a flexible container, in which fluid is held, a check valve provided between the passage and the quantitative suction chamber and adapted to be opened only toward the quantitative suction chamber, a ball which is provided in an extraction port formed on a side wall of the quantitative suction chamber, and which is adapted to be urged toward the quantitative suction chamber by a spring, and a piston provided at a corner of the quantitative suction chamber and adapted to be spring-biased by a spring. When the piston is pressed against the resilient force of the spring, the valve is closed by a fluid held in the quantitative suction chamber, and the ball is pressed at the same time, so that the fluid can be discharged from an outlet port. When the piston is returned by the resilient force of the spring, the valve is opened by a negative pressure with the outlet port kept closed by the ball, to enable fluid to be introduced again into the quantitative suction chamber while contracting the flexible container. Therefore, according to the conventional liquid discharge device, the fluid can be sucked from the flexible container and discharged to the outside by reciprocating movement of the piston. This enables the fluid in the flexible container to be used up most efficiently. A similar known fluid discharge device is disclosed in JP-A-59,80261. The device has a piston which moves against the action of a spring in a cylindrical portion, which extends from the storage chamber and defines the suction chamber. However, in the above-mentioned conventional construction, the operating valve used to suck and discharge the fluid, and the piston means including the ball have a complicated structure, and this causes the productivity of the device to decrease and the price thereof to increase. Since the piston mechanism having a complicated construction as mentioned above is joined to the opening of the flexible container, the length and volume of the fluid discharge device as a whole increase, and the shape of the device is limited in flexibility. Therefore, this fluid discharge device cannot apply to containers of various shapes including a minaturized container and a flat the container. Document EP-A-0 073 918 discloses a fluid discharge device for rigid containers comprising a suction chamber defined by a piston and cylinder arrangement wherby the one-way values are substantially flat movable flaps. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a fluid discharge device which is free from the drawbacks encountered in the prior art fluid discharge device. Another object of the present invention is to provide a fluid discharge device capable of discharging fluid from a fluid storage chamber to the outside a suitable quantity at a time in a reliable manner by a simple pressing operation. Still another object of the present invention is to provide a fluid discharge device which can be made without requiring any complicated construction, with a relatively high productivity and at a relatively low cost and housed in containers of various shapes. According to the present invention there is provided a fluid discharging device comprising: a storage chamber comprising soft material for containing fluid; a fixed member including a lower portion to which said storage chamber is secured; a hollow cylindrical piston having a first one-way valve openable in a direction away from said storage chamber; a press member disposed opposite said storage chamber with respect to said lower portion and movable in the device relative to said fixed member, and having a second one-way valve openable in a direction away from the storage chamber; and a resilient spring between said fixed member and said press member, said resilient spring biasing said press member away from said fixed member (as disclosed in JP-A-59 80261), the device being characterised in that said cylindrical piston extends from said lower portion in a direction away from said storage chamber and has first end open to said storage chamber and a second end defining an upper surface; that the first one-way valve is disposed at the upper surface of said cylindrical piston and normally closes the second end of said piston; that said press member includes a cylindrical portion having a first end disposed around and slidable along said cylindrical piston at the exterior of said storage chamber and a second end defining an upper surface spaced from the upper surface defined by the second end of said piston, the cylindrical portion of said press member and the upper surface of said piston defining a suction chamber; that the second one-way valve is disposed at the upper surface of said cylindrical portion and normally closes said suction chamber to the exterior of the device, said second one-way valve comprising a substantially flat flap which is movable in a direction away from said suction chamber to open said suction chamber to the exterior of said device, and that said resilient spring is disposed around said piston and said cylindrical portion outside of said storage chamber. BRIEF DESCRIPTION OF THE DRAWING Fig. 1 is a sectional view of a first embodiment of the fluid discharge device according to the present invention; Figs. 2 and 3 illustrate an operation of the embodiment of Fig. 1; Fig. 4 is a sectional view of a second embodiment of the present invention; Fig. 5 is a sectional view of a third embodiment of the present invention; Fig. 6 is a sectional view of a fourth embodiment of the present invention; and Fig. 7 is a sectional view of a fifth embodiment of the present invention. PREFERRED EMBODIMENT OF THE INVENTION In Fig. 1, a fixed member 1 has a hole 2 which is provided with a hollow, cylindrical piston 4 which has a normally-closed check valve 3 on its upper wall, and which is formed integrally with or separately from the hole 2. A press member 6 is provided with an integrally formed hollow cylinder 8 which has a normally-closed check valve 7 on its upper wall, and which is fitted slidably around the piston 4, and an outward protection 5 is formed on the outer surface of the upper portion of the piston 4 in the fixed member 1. An inward protection 9 is formed on the inner surface of the lower end portion of the cylinder 8 and adapted to be engaged with the outward protection 5 and thereby prevent the press member 6 from coming off in the upward direction. As illustrated, a stepped portion is formed on the inner surface of the fixed member 1, so that the outer circumferential portion of the press member 6 is engaged with the stepped portion. A resilient member 10 such as a helical spring is provided between the press member 6 and the fixed member 1, so that the press member 6 is urged upward by the spring 10 so that the press member 6 can be pressed down against a resilient force of the spring 10. A storage chamber 11 holds a predetermined viscous fluids such as a cosmetic fluid and a writing fluid. The storage chamber 11 is formed of a soft material, such as a synthetic resin film and a metal film, which can be contracted as the fluid held therein is consumed, and the storage chamber 11 communicates with the piston 4 in the fixed member 1. In order to secure the storage chamber 11 to the fixed member 1, thermal fusion or a clamping method using a ring can be used when the walls of the storage chamber 11 are thin, and a direct screwing method or a press-fitting method can be used when the walls of the storage chamber 11 are thick as in the case of a blow container. The storage chamber 11 may also be secured to the opening at the lower end of the piston 4 in the fixed member 1 instead of the fixed member 1 itself. A fluid discharging operation of the above-described embodiment will now be described with reference to Figs. 2 and 3. In order to discharge the fluid held in the storage chamber 11 to the upper surface of the press member 6, the press member 6 in the position shown in Fig. 1 is pressed down against the resilient force of the spring 10. Consequently, the cylinder 8 of the press member 6 is also displaced downward with respect to the piston 4. During this time, the valve 3 in the piston 4 is closed. Accordingly, if the fluid is held in the cylinder 8, the fluid is pressurized due to the downward movement of the cylinder 8 to cause the valve 7 in the cylinder 8 to be pressed and opened, so that the fluid is discharged to the upper surface of the press member 6 as shown by an arrow in Fig. 2. When the pressing force is then released from the press member 6, the press member 6 and cylinder 8 are retracted by the resilient force of the spring 10 to the position shown in Fig. 3. During this step, the pressure in the interior of the cylinder 8 becomes negative due to the upward movement of the cylinder 8. Accordingly, the valve 7, which is opened in the above-mentioned pressing step, in the cylinder 8 is closed, while the valve 3, which is closed in the above-mentioned step, in the piston 4 is pressed and opened by the fluid flowing from the storage chamber 11 to the interior of the piston 4. Consequently, the cylinder 8 is filled with the fluid again as shown by an arrow in Fig. 3. Since the storage chamber 11 contracts as the fluid held therein is consumed, the fluid can be used to the last without waste. Thus, when the press member 6 is pressed down, the fluid held in the cylinder 8 can be discharged to the upper surface of the press member 6, and, when the pressing force is released from the press member 6, the cylinder 8 can be filled with the fluid again. Therefore, the fluid held in the storage chamber 11 can be discharged by a suitable quantity at a time. Fig. 4 shows a second embodiment of the present invention, which is different from the first embodiment in that one end portion of a fixed member 1 and the corresponding portion of a press member 6 are joined together pivotably with a pin 12 to thereby render the press member 6 capable of being pressed down around a fulcrum consisting of the pivotable joint portion. In the embodiment of Fig. 4, the operation of the press member 6 can be stably carried out. This enables the discharging of a suitable quantity of the fluid to be done more reliably. Fig. 5 shows a third embodiment of the present invention, which is different from the first embodiment in that a dome-like hood 14 having a guide outlet 13 is provided over a valve 7 in a cylinder 8 formed on the inner surface of a press member 6. In the embodiment of Fig. 5, the upper surface of the hood 14 can be pressed, so that the central portion of the press member 6 which is just above the cylinder 8 can be pressed down. Accordingly, a suitable quantity of the fluid can be discharged more stably. In the embodiment of Fig. 5, the fluid passes through the valve 7, and is then discharged to the upper surface of the press member 6 via the guide outlet 13 of the hood 14. Fig. 6 shows a fourth embodiment of the present invention, which is different from the first embodiment in that a press member 6 and a fixed member 1 are miniaturized with a collapsible storage chamber 11 which can be flattened. Fig. 7 shows a fifth embodiment of the present invention, which is different from the first embodiment in that a fixed member 1, to which a storage chamber 11 is secured, is fitted fixedly in a container 15. Referring to the drawing, reference numeral 16 denotes a locking projection provided so that a cap or cover (not shown) can be engaged therewith. According to the present invention, a fluid discharge device can be manufactured with a simple construction at a low cost, and is applicable to containers of various shapes and capable of discharging the fluid, which is held in a storage chamber, a suitable quantity at a time with a very simple operation. The above-described fluid discharge devices are the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments. For example, a guide groove which is used when the press member 6 is pressed down may be provided is the inner surface of the fixed member 1. The present invention can apply not only to the container in the embodiment of Fig. 7 but also to the containers of various other shapes. It may be understood that the present invention can be changed partially and modified in various manner within the scope of the claims.

Claims: 1. A fluid discharging device comprising: a storage chamber (11) comprising soft material for containing fluid; a fixed member (1) including a lower portion to which said storage chamber is secured; a hollow cylindrical piston (4) having a first one-way valve (3) openable in a direction away from said storage chamber; a press member (6) disposed opposite said storage chamber with respect to said lower portion and movable in the device relative to said fixed member, and having a second one-way valve (7) openable in a direction away from the storage chamber; and a resilient spring (10) between said fixed member and said press member, said resilient spring biasing said press member away from said fixed member, the device being characterised in that said cylindrical piston (4) extends from said lower portion in a direction away from said storage chamber and has first end open to said storage chamber and a second end defining an upper surface; that the first one-way valve (3) is disposed at the upper surface of said cylindrical piston (4) and normally closes the second end of said piston; that said press member includes a cylindrical portion (8) having a first end disposed around and slidable along said cylindrical piston (4) at the exterior of said storage chamber and a second end defining an upper surface spaced from the upper surface defined by the second end of said piston, the cylindrical portion of said press member and the upper surface of said piston defining a suction chamber; that the second one-way valve (7) is disposed at the upper surface of said cylindrical portion (8) and normally closes said suction chamber to the exterior of the device, said second one-way valve comprising a substantially flat flap which is movable in a direction away from said suction chamber to open said suction chamber to the exterior of said device, and that said resilient spring (10) is disposed around said piston and said cylindrical portion outside of said storage chamber. 2. A fluid discharging devices as claimed in claim 1, wherein said first one-way valve comprises a flap integral with said cylindrical piston (4), and said flap of said second one-way valve is integral with said cylindrical portion (8). 3. A fluid discharging device as claimed in claim 1 wherein said press member (6) is pivotably mounted to said fixed member. 4. A fluid discharging device as claimed in claim 1 and further comprising a hood (14) extending over the upper surface of said cylindrical portion and covering said second one-way valve, said hood having an outlet through which fluid passing through said second one-way valve is dischargeable. 5. A fluid discharging device as claimed in claim 1 wherein said storage chamber (11) is collapsible. 6. A fluid discharging device as claimed in claim 1 and further comprising a container, said storage chamber being mounted to said container and disposed therein.

Inventors: NOGUCHI, KAZUMA, SEKIGUCHI, TOMOZO
Applicants: PENTEL KABUSHIKI KAISHA
Application year: 1987
Main classification: B65D83
IPC codes: B05B11