LIQUID SOAP DISPENSER

Abstract: A dispenser (10) for liquid soap containing grit includes a cylindrical, flexible, resilient nipple (31) mountable on a soap container (12) in communication with the outlet opening (16) thereof, and clamping therebetween a check valve assembly (40) including a slitted flexible membrane (45). The nipple has a duckbill-shaped tip (38) with a discharge slit (39) therein. Soap (20) fills the nipple. For dispensing soap, an actuator (50) laterally compresses the nipple in directions perpendicular to its longitudinal axis and to the discharge slit. The increased pressure in the nipple holds the check valve closed and ejects soap from the discharge slit. When the actuator is released the nipple expands to its normal position, closing the discharge slit and opening the check valve to draw a new charge of soap into the nipple.

Description: Field of the Invention The present invention relates to a liquid soap dispenser. In use, the dispenser normally dispenses soap in discrete quantities. The invention has particular application to the dispensing of liquid soap containing grit for scouring purposes. Background of the Invention One type of soap dispenser is disclosed in my U.S. Patent No. 4,018,363 and includes a flexible pump bowl which receives soap from a container through a diaphragm-type check valve. When the bowl is compressed it closes the check valve and forces the soap in the bowl out through a passageway to a discharge outlet. This structure is relatively complex and is not well suited to the dispensing of soap containing grit, since the grit tends to clog the passageways in the device. A similar type of dispenser using a compressible pump bowl or nipple is disclosed in U.S. Patent No. 1,326,880, the dispenser ejecting soap directly from a slit in the pump nipple. This dispenser utilizes a custom-made check valve stopper in the soap container outlet, and depends on distortion of the slit in the nipple for dispensing of soap therefrom. Thus, the nipple is compressed in the direction of the slit. This has the disadvantage that the slit can be opened permitting soap to drip therefrom before pressure in the nipple has been raised sufficiently to close the check valve. FR-A-1 206 034 discloses a discharge assembly for a liquid soap dispenser including a liquid soap container having an outlet opening, the discharge assembly including an elongate flexible resilient outer nipple having a normal expanded condition defining a discharge chamber for accommodating a charge of liquid soap and having a longitudinal axis, the nipple having an inlet opening at one end thereof and being provided at the other end thereof with a normally closed discharge slit extending generally perpendicular to the longitudinal axis of the nipple. A clip member mounts the nipple on the container with the inlet opening disposed in registry with the container outlet opening. A check valve, in the form of a bell-shaped nipple which extends within the elongate outer nipple, is disposed between the inlet opening and the container outlet opening. The outer nipple is laterally compressible, in a direction substantially perpendicular to the axis of the nipple and to the discharge slit, to a compressed condition. Movement of the nipple to the compressed condition thereof raises the pressure in the discharge chamber closing the check valve and ejecting liquid soap fro the discharge slit. Movement of the nipple back to the expanded condition thereof lowers the pressure in the discharge chamber closing the discharge slit and opening the check valve to draw a new charge of liquid soap into the discharge chamber. FR-A-1 399 098 discloses a discharge assembly for a liquid soap dispenser which includes bans defining a discharge chamber having an inlet opening with a resilient check valve member, in the form of a bell-shaped nipple, mounted therein and having an outlet opening with a duck bill-shaped valve mounted therein and communicating with the inlet opening through the discharge chamber. A plunger is operable to discharge liquid soap contained in the discharge chamber through the duck-billed valve, and upon restoring, the plunger draws liquid soap into the discharge chamber through the check valve. Summary of the Invention It is a general object of the invention to provide a liquid soap dispenser including improved discharge assembly which avoids the disadvantages of prior devices while affording additional structural and operating advantages. An important object of the invention is the provision of a liquid soap dispenser including a discharge assembly which is suitable for dispensing liquid soap containing grit. Another object of the invention is the provision of a liquid soap dispenser including a discharge assembly of the type set forth, which is of simple and economical construction, and is characterized by ease of assembly. Still another object of the invention is the provision of a liquid soap dispenser including a discharge assembly of the type set forth, which is dependent upon an increase in pressure within a discharge nipple for operation of the discharge assembly. In accordance with the present invention there is provided a liquid soap dispenser including: a liquid soap container having an outlet opening; an elongate flexible resilient nipple having a normal expanded condition defining a discharge chamber for accommodating a charge of liquid soap and having a longitudinal axis, said nipple being generally cylindrical in shape and having aproximal end and a distal end with a cylindrical side wall at its proximal end and an annular flange integral with the side wall and extending radially outwardly therefrom, an inlet opening being defined at the proximal end of the nipple and the distal end of said nipple including sloping wall portions which converge to a flat rectangular tip with a normally closed discharge slit formed in said tip and extending diametrically of said nipple and generally perpendicular to said longitudinal axis, means mounting said nipple on said container with said nipple inlet opening disposed in registry with said container outlet opening; check valve means disposed between said inlet opening and said container outlet opening; and actuating means engageable with said nipple for effecting lateral compression thereof, in a direction substantially perpendicular to said axis and to said slit, to a compressed condition, movement of said nipple to the compressed condition thereof raising the pressure in said discharge chamber for closing said check valve and ejecting liquid soap from said discharge slit, movement of said nipple back to the expanded condition thereof lowering the pressure in said discharge chamber for closing said discharge slit and opening said check valve to draw a new charge of liquid soap into said discharge chamber; characterized by: said check valve means including a flat circular diaphragm having a valve slit formed therein centrally thereof, and a flat backing disk having an opening therein centrally thereof, said nipple having an upstanding cylindrical wall portion integral with its annular flange adjacent the outer periphery thereof defining a recessed upper end portion of the nipple, said check valve means being seated on said annular flange with said diaphragm extending across said inlet opening and said backing disk overlying said diaphragm with its opening in registry with said valve slit, and said nipple wall portion defining retaining means cooperating with said backing disk and said diaphragm near the edges thereof for retaining said check valve means in said recessed upper end portion of the nipple. Further features of the invention are defined in claims 2 to 8. Brief Description of the Drawings For the purpose of facilitating an understanding of the invention, there is illustrated in the accompanying drawings a preferred embodiment thereof, from an inspection of which, when considered in connection with the following description, the invention, its construction and operation, and many of its advantages should be readily understood and appreciated. FIG. 1 is a fragmentary, sectional view of a liquid soap dispenser in accordance with and embodying the features of the present invention; FIG. 2 is a perspective view of the discharge assembly of the dispenser of FIG. 1; FIG. 3 is an exploded perspective view of the discharge assembly of FIG. 2, rotated 180 degrees; FIG. 4 is an enlarged sectional view of the discharge assembly of FIG. 2, taken along the line 4-4 therein; FIG. 5 is an enlarged fragmentary view in vertical section taken along the line 5-5 in FIG. 1, and illustrating the discharge assembly in its normal rest position; FIG. 6 is a view similar to FIG. 5, illustrating the discharge assembly in its compressed discharge position; FIG. 7 is a view similar to FIGS. 5 and 6, illustrating the discharge assembly in its recharging condition; FIG. 8 is an enlarged bottom plan view of the discharge assembly in FIG. 5; and FIG. 9 is a view similar to FIG. 8, illustrating the discharge assembly in its compressed condition of FIG. 6. Description of the Preferred Embodiment Referring to FIGS. 1 and 5, there is illustrated a liquid soap dispenser, generally designated by the numeral 10, including a discharge assembly 30. The dispenser 10 includes a housing 11, which may be mounted by suitable means (not shown) on a wall or other support surface, and in which is disposed a container 12 of liquid soap. The container 12 may be in the form of a bottle or the like which is replaceably mounted in the housing 11, so that when it is empty it can be replaced with a full container. The container 12 has a cylindrical neck 13 at its lower end provided with an annular flange 14 extending radially outwardly therefrom around the circumference thereof. The neck 13 has a flat annular end surface 15 at its distal end and defines a cylindrical outlet opening 16 of the container 12. The housing 11 includes a generally cylindrical retainer 17 which is disposed for substantially enclosing the neck 13 and the associated discharge assembly 30, the retainer 17 having an opening 18 in the side thereof for a purpose to be explained more fully below. The container 12 contains liquid soap 20, which is preferably of the type containing particles 21 of grit suspended therein, the grit particles 21 being of a suitable material for providing an abrasive or scouring function, in a known manner. Referring now also to FIGS. 2 to 4 of the drawings, the discharge assembly 30 includes an elongated, generally circularly cylindrical nipple 31 formed of a suitable flexible, resilient material, such as rubber. The nipple 31 has a cylindrical side wall 32 provided at one end thereof with a radially outwardly extending annular flange 33, integral at the outer periphery thereof with an upstanding cylindrical wall 34 which defines an inlet opening into the nipple 31. The cylindrical wall 34 has an annular groove 35 formed on the inner surface thereof adjacent to the flange 33, the wall 34 also being provided with two diametrically opposed and axially extending part-cylindrical notches 35a communicating with the groove 35. The nipple 31 defines a discharge chamber 36 therein, and is provided at its distal end with a pair of radially inwardly sloping concave walls 37 which cooperate to form a flat, narrow duckbill-shaped tip 38 at the distal end of the nipple 31 closing the discharge chamber 36. Formed in the tip 38 and extending longitudinally thereof, substantially diametrically of the nipple 31, is an elongated discharge slit 39, which is normally held closed by the resilient bias of the nipple 31. Seated in the upper end of the nipple 31 is a valve assembly 40, which includes a circular backing disk 41 which is disposed in the groove 35 and has a circular opening 42 formed therethrough centrally thereof. Also disposed in the groove 35 and seated on the annular flange 33 beneath the backing disk 41 is a circular membrane 45 formed of a suitable flexible resilient material impermeable to liquid soap. The membrane 45 has a straight-line slit 46 formed therein extending substantially diametrically thereof in registry with the opening 42 in the backing disk 41. It will be appreciated that the notches 35a in the nipple wall 34 facilitate flexure thereof to permit insertion of the backing disk 41 and the membrane 45 in the groove 35. In use, when the discharge assembly 30 has been assembled as described above, it is mounted on the container 12. More specifically, the cylindrical wall 34 is fitted over the distal end of the neck 13 in surrounding relationship therewith, until the wall 34 abuts the flange 14, and the end surface 15 of the neck 13 engages the upper surface of the backing disk 41, as illustrated in FIG. 5. In this mounted configuration, the check valve assembly 40 is disposed for controlling the flow of liquid soap between the outlet opening of the container 12 and the inlet opening of the nipple 31. A generally cylindrical retaining clip 47 is then applied to hold the discharge assembly 30 in place on the neck 13, the clip 47 having parallel, spaced-apart, annular upper and lower flanges 48 and 49, respectively engaging the outer surfaces of the flanges 14 and 33, securely to clamp the cylindrical wall 34 of the nipple 31 against the flange 14 of the neck 13. Preferably, the retainer 17 is detachable from the housing 11 to facilitate mounting of the discharge assembly 30. There is also provided an actuator 50 which is carried by the housing 11 by suitable means (not shown). The actuator 50 projecting through the opening 18 in the retainer 17 for engagement with the outer surface of the nipple 31, as indicated in FIGS. 1 and 5. Referring now also to FIGS. 6-9, the operation of the dispenser 10 and the discharge assembly 30 will be explained. Preferably, the discharge assembly 30 is assembled on the container 12 when the neck 13 is disposed upwardly. Then, after assembly, the container 12 is inverted and mounted in the housing 11, as indicated in FIG. 1, with the nipple 31 projecting downwardly through and from the bottom of the retainer 17. The nipple 31 is oriented so that the discharge slit 39 is substantially parallel to the opening 18 in the retainer 17, so that the actuator 50 engages the nipple 31 toward one side of the slit 39, rather than at an end thereof. The container 12 may be vented, so that atmospheric pressure plus the weight of the liquid soap 20 on the membrane 45 will force the slit 46 open, allowing liquid soap to flow through the opening 42 in the backing disk 41 and through the slit 46 into the discharge chamber 36 in the nipple 31. This flow will continue until the discharge chamber 36 is filled, at which point the pressure on the opposite sides of the membrane 45 will be equalized, thereby allowing the slit 46 to close in an equilibrium condition, illustrated in FIG. 5. The nipple 31 is so constructed that in this nomal equilibrium condition, the natural resilient bias of the nipple 31 will hold the discharge slit 39 closed against the weight of the charge of liquid soap 20 contained in the discharge chamber 36. When it is desired to dispense a charge of liquid soap, a user operates the actuator 50 for compressing the side of the nipple 31 in the direction of the arrows in FIGS. 6, 8 and 9. This compression of the cylindrical wall 32 of the nipple 31 raises the pressure in the discharge chamber 36, so that it holds the slit 46 of the valve assembly 40 closed, and forces the ejection of a charge 55 of liquid soap from the discharge slit 39, as illustrated in FIGS. 6 and 9. When the actuator 50 is released, it will return to its normal rest position under the urging of suitable bias means (not shown), and the compressed wall of the nipple 31 will tend to return to its normal expanded condition, illustrated in FIG. 7, as a result of the natural resilience of the nipple 31. This reexpansion of the nipple 31 will lower the pressure therein to a pressure below that in the container 12, so as to allow the discharge slit 39 to reclose and to open the valve assembly slit 46 and draw in a new charge of liquid soap from the neck 13, as indicated in FIG. 7. When the discharge chamber 36 is filled, the discharge assembly 30 returns to its equilibrium position, illustrated in FIGS. 5 and 8. It will be appreciated that, because the actuator 50 engages the nipple 31 in a direction perpendicular to the longitudinal axis thereof and perpendicular to the direction of the slit 39, the initial compression of the nipple 31 will not cause the discharge slit 39 to be directly distorted into an open condition, as would be the case if the nipple 31 were to be compressed from an end of the slit 39. Thus, liquid soap cannot be discharged from the discharge slit 39 until the pressure within the discharge chamber 36 has been raised sufficiently to force the ejection of liquid soap through the discharge slit 39, at which pressure the valve slit 46 will be held closed. Because the liquid soap 20 is discharged directly from the nipple 31, there are no narrow passages to be clogged by the grit particles 21. Furthermore, the pumping action of the nipple 31 during the discharge operation serves to flush accumulated grit particles 21 from the discharge chamber 36 during each dispensing operation. In a model of the present invention, the nipple 31 is of unitary, one-piece construction, and may be formed by molding. The container 12 may be formed of a suitable plastic, and the housing 11, the retainer 17 and the actuator 50 may be formed of plastic or metal. It will be appreciated that the discharge assembly 30 can readily be assembled and mounted on the container 12 without the use of tools. From the foregoing it can be seen that there has been provided an improved liquid soap dispenser having a discharge assembly which is of simple and economical construction, and is uniquely suited for the discharge of liquid soap containing grit particles without clogging, and without leakage of soap until the check valve thereof has been closed.

Claims: A liquid soap dispenser (10) including: a liquid soap container (12) having an outlet opening (16); an elongate flexible resilient nipple (31) having a normal expanded condition defining a discharge chamber (36) for accommodating a charge of liquid soap and having a longitudinal axis, said nipple being generally cylindrical in shape and having a proximal end and a distal end with a cylindrical side wall (32) at its proximal end and an annular flange (33) integral with the side wall and extending radially outwardly therefrom, an inlet opening being defined at the proximal end of the nipple and the distal end of said nipple including sloping wall portions (37) which converge to a flat rectangular tip (38) with a normally closed discharge slit (39) formed in said tip and extending diametrically of said nipple and generally perpendicular to said longitudinal axis, means mounting said nipple on said container with said nipple inlet opening disposed in registry with said container outlet opening; check valve means (40) disposed between said inlet opening and said container outlet opening; and actuating means (50) engageable with said nipple for effecting lateral compression thereof, in a direction substantially perpendicular to said axis and to said slit, to a compressed condition, movement of said nipple to the compressed condition thereof raising the pressure in said discharge chamber for closing said check valve and ejecting liquid soap from said discharge slit, movement of said nipple back to the expanded condition thereof lowering the pressure in said discharge chamber for closing said discharge slit and opening said check valve to draw a new charge of liquid soap into said discharge chamber; characterized by: said check valve means (40) including a flat circular diaphragm (45) having a valve slit (46) formed therein centrally thereof, and a flat backing disk (41) having an opening (42) therein centrally thereof, said nipple having an upstanding cylindrical wall portion (34) integral with its annular flange adjacent the outer periphery thereof defining a recessed upper end portion of the nipple, said check valve means being seated on said annular flange with said diaphragm extending across said inlet opening and said backing disk overlying said diaphragm with its opening in registry with said valve slit, and said nipple wall portion defining retaining means (35) cooperating with said backing disk and diaphragm near the edges thereof for retaining said check valve means in said recessed upper end portion of the nipple. The liquid soap dispenser of claim 1, wherein said cylindrical wall portion has an annular groove (35) in the inner surface thereof adjacent to the flange (33), defining said retaining means. The liquid soap dispenser of claim 2, wherein said cylindrical wall portion has two diametrically opposed and axially extending part-cylindrical notches (35a) communicating with said annular groove (35) to facilitate flexure of said cylindrical wall portion to permit insertion of the edges of the backing disk and the diaphragm into the groove. The liquid soap dispenser of any preceding claim, further including a housing (11) accommodating said soap container therein. The liquid soap dispenser of claim 4, wherein said housing includes an outlet portion (17) accommodating said nipple therein. The liquid soap dispenser of claim 5, wherein said outlet portion has an opening (18) therein accommodating said actuating means. The liquid soap dispenser of any preceding claim, wherein said wall portion (34) of said nipple at the proximal end thereof is adapted for coupling to the soap container in surrounding relationship with the outlet opening. The liquid soap dispenser of claim 7, further including attachment means (47) for securing said proximal end of said nipple to the container.

Inventors: CASSIA, ANTONIO MACCHI
Applicants: STEINER COMPANY, INC.
Application year: 1986
Main classification: A47K5
IPC codes: A47K5