Source: https://patents.google.com/patent/US4336895
Timestamp: 2018-02-23 16:56:51
Document Index: 516052518

Matched Legal Cases: ['art 18', 'art 51', 'arts 53', 'art 53', 'art 54', 'art 51', 'art 54', 'art 51', 'art 51', 'art 54', 'art 51', 'art 54', 'art 219', 'art 219', 'art 219']

US4336895A - Finger actuated pump assembly - Google Patents
US4336895A
US4336895A US06125083 US12508380A US4336895A US 4336895 A US4336895 A US 4336895A US 06125083 US06125083 US 06125083 US 12508380 A US12508380 A US 12508380A US 4336895 A US4336895 A US 4336895A
US06125083
Hans P. Aleff
Aleff Hans P
This is a continuation-in-part of copending application Ser. No. 819,880 filed July 28, 1977 now U.S. Pat. No. 4,201,317 issued May 6, 1980.
Manually operated dispensing pumps for liquid containers have been proposed in the past, and one having wide commercial application is disclosed in U.S. Pat. No. 3,749,290 issued to Micallef on July 31, 1973. This patent disclosed a variable volume pump chamber formed by a flexible tubular member, the volume of the chamber being varied by the trigger distorting the tube. Another dispensing pump is disclosed in U.S. Pat. No. 3,973,700 issued to Schmidt, et al on Aug. 10, 1976. This patent shows the use of a resilient bellows as the variable volume pump chamber, with all the valving molded integrally with the bellows structure.
The use of a tubular member as shown by Micallef calls for a very flexible and resilient material such as rubber which may not be chemically resistant to many of the liquids intended to be dispensed. The use of a bellows overcomes this problem of freedom of material selection, however valving flaps in a bellows structure such as disclosed by Schmidt, et al provides for only minimal pressure to be exerted on the sealing surfaces of the flaps, thereby making it difficult to achieve a liquid tight seal.
In both pump types preferred to above, it is possible for vapors to be generated by the liquid in the container, i.e. under conditions of exposure to heat, such action can force liquid from the bottle into the pump chamber and through the discharge valve out into the open. This is in part due to the fact that the discharge valves are resilient and yield even to small pressures. For the same reason, both pump types referred to have the drawback that the spray pattern and liquid dispersion depends on the speed with which the trigger is pressed; a slow trigger movement resulting in a wet spray with large droplets or a stream, even when a fine, evenly dispersed spray pattern may be desired. Furthermore, these types of pumps are expensive, requiring parts of complex structure which are relatively costly to both manufacture and assemble.
Attempts to more evenly regulate product flow by regulation of the amount of container available for collapse, i.e. reduced volume, have included the use of bellows for such purpose as indicated by U.S. Pat. No. 3,255,933 to Martin. U.S. Pat. No. 3,409,184 to Stengle, Jr. additionally utilized an axially collapsible bellows to receive product prior to dispensing such by its collapsing action.
Other prior patents known to the applicant includes U.S. Pat. Nos. 3,061,202; 3,451,597, 3,486,663; 3,715,060; 3,726,442, 3,905,520, 3,986,644 and 3,955,774.
The above indicated patents are those which applicant is aware of and their citation herein and discussion where believed appropriate constitutes applicant's Prior Art Statement.
More specifically, the present invention relates to a pump with a variable volume pump chamber in the shape of a bellows with a finger operated actuator which may include an integrally molded trigger, a one-piece molded intake check valve between the bottle and the pump chamber, and a discharge valve at the exit from the pump chamber to the surrounding atmosphere. The discharge valve will only open after the bellows has been partially collapsed and a predetermined minimum or threshold amount of pressure has been applied to the non-compressible liquid contained in the bellows. Until the discharge valve opens to free a passage for such liquid under pressure, the energy expended, i.e. finger pressure application by the user, is stored by collapsing the walls of the pump chamber and compressing any air remaining in the pump chamber. This delay and energy storage ensures that the liquid will be forced out of the variable volume pump chamber with a predictable and constant minimum pressure and speed, thereby creating a predictable and constant spray pattern and dispersion of the liquid for each specific discharge, configuration, size, etc. In most conventional pumps, this spray pattern and dispersion of the liquid depends mainly on finger actuation speed; a wet spray or a stream being a result of slow finger motion. It is also possible in most conventional pumps for vapors generated by the liquid in the container under conditions of exposure to heat to force liquid from the bottle into the pump chamber and through the discharge valve out into the open because the discharge valves are resilient and yield even to small pressures. This drawback is avoided in the present invention because the discharge valve will not yield to pressures from the inside of the pump chamber but has to be operated by positive movement of the actuator.
A further feature of the invention is to provide a pump sprayer having the foregoing characteristics wherein each component may be easily and inexpensively molded. Generally, such components are molded by injection molding with molds of relatively simple construction; however, the bellows in the second embodiment constructed with a finger operated vertically orientated actuator is intended to be formed by blowmolding techniques. All components are also designed to be easily assembled with known high-speed automatic assembly equipment, using only press fits with accordingly no need for more expensive assembly techniques such as gluing or welding, except for the optional gluing of an optional screw cap liner into the screw cap, as is presently done on conventional screw caps for bottles.
A further feature of the invention is to provide a pump sprayer having the foregoing characteristics and having a minimum number of components and including a body incorporating a bellows-structure, a screw cap, a lower check valve, an outer shell in one embodiment and an actuator in the other embodiment, a screw cap liner, a dip tube, a dispensing nozzle, and in the embodiment with the finger operated vertically orientated actuator also a sealing gasket.
Reference will now be made to the several embodiments of the invention illustrated in the drawings.
FIG. 12 is a perspective view of another or second embodiment of the invention showing the pump thereof in the rest position, fitted on the neck of a container for liquid to be dispensed.
FIG. 15 shows the lower check valve in the open position during the return stroke of the actuator and bellows;
FIG. 16 is a perspective view of the lower check valve in the closed position;
FIG. 17 is a perspective view of the lower check valve in the open position;
FIG. 21 is a partial sectional view of an alternate form of that embodiment of the invention shown in FIGS. 12-20 and shows a different manner in which the discharge valve is actuated;
FIG. 22 is a partial sectional view similar to FIG. 21 showing the discharge valve in an open position, it having been shown in the closed position in FIG. 21;
FIG. 23 is a sectional view similar to FIG. 2 but showing an alternate constructional embodiment;
FIG. 24 is a sectional view of the pump construction shown in FIG. 23 but in its actuated or open product discharge position; and
FIG. 25 is a sectional view taken on the line 25--25 of FIG. 23.
Referring to FIGS. 1-11 of the drawings, a manually operated trigger actuated pump 10 is shown on the neck 12 of a container 14 containing the selected liquid to be dispensed. The pump includes an outer shell 15 or housing and a body 16. This body 16 is constructed in such a way that it has a relatively rigid upper flange 17 and a relatively rigid lower part 18. The body also includes a bellows 19 formed by intermediate walls 20 connected to each other and to the rigid parts of the body integrally and hingedly at such angles that these angles can easily be changed by applying pressure against a trigger 21. The modification of such angles changes the volume enclosed by the bellows 19.
During the assembly of body 16 into outer shell 15, a gooseneck 34 of the body 16 which is molded as an integral part thereof and parallel to a vertical front 35 of said body, is elastically bent so that the upper vertical part of the gooseneck 34 contacts the upper part of the vertical front wall 35 of the body 16, and a hook 36 of the gooseneck 34 snaps into an opening 37 in the bottom of the extension 42 of the outer shell 15. The hook 36 has an overall span slightly larger than the opening 37 so that the hook 36 is bent and under tension, and, due to its plastic memory, presses a pad, i.e. a semi-spherical protrusion or pad 38 on the hook 36 tightly into an exit or passage 39 molded through the tubular extension 22 of the outer shell 15, said protrusion 38 thereby sealing the exit slot 39 with strong pressure applied to the sealing surfaces. This cooperation between the exit slot 39 and the pad 38 on the hook 36 forms the construction of the discharge valve 40.
A flat and thin shield 43 above the gooseneck 23 extends over the whole width of the pad 38 on the hook 36, and said shield 43 is elastically bent against the slanted wall 44 above the exit slot 39 in the outer shell 15. The pressure needed to bend this shield is very small so that no significant amount of spring tension of the hook 36 is diverted from the sealing of the discharge valve 40 in order to bend the shield 43. However, the memory of the material from which the shield 43 is molded as an integral part of the body 16 assures that the shield 43 will always be in contact with the wall 44 unless air or liquid coming from internal portions of the bellows 19, i.e. a portion of a pump chamber 19a through the exit slot 39 forces the shield 43 to bend away from the inclined wall 44.
The length of the gooseneck 34 is such that it is slightly bent after the assembly of the body 16 into the outer shell 15. If pressure is exerted on the trigger 21, the lower end of the bellows 19 formed by the hingedly connected walls 20 of the body 16 collapses, and the lower part of the vertical front wall 35 of the body rotates around an imaginary axis located in a thin material portion 45 of the front wall 35 of the body 16, said area 45 being thin and relatively flexible compared with the upper and lower ends of the front wall 35 of the body 16, and this area 45 thus forms a hinge connecting the upper and lower ends of the front wall 35 of the body 16. The gooseneck 34 is connected to the lower end of the front wall 35 of the body 16 by a rigid base 46 which projects from the lower part of the front wall 35 of the body 16. The area 47 where the rigid base 46 merges into the flexible part of the gooseneck 34 rotates also around such imaginary axis in the thin area 45 thereby increasing the distance between the merging area 47 and the exit slot 39.
Reference will now be made to FIGS. 2 and 3 in particular conjunction with FIGS. 16 and 17 wherein a check valve 50 formed of plastic material is assembled by friction fit into the lower part of the body 16. The check valve includes a tubular part 51 and a hingedly connected cover 52 having first and second parts 53 and 54 respectively. The cover is molded in one piece with an open first hinge 55 but closed for assembly into the lower part of the body 16. The sidewalls 56 of the lower part of the body 16 contact the first part 53 of the cover 52 which is nearest to the hinge 55 and thus prevents the check valve from returning to an open first hinge position. A second hinge 57 molded into the cover 52 and intermediate the first and second parts thereof allows the second part 54 to rotate around the hinge 57, thereby opening a passage 58 through the tubular part 51.
In the rest position, the memory of the hinge 57 molded into the cover 52 causes the second part 54 of the cover 52 to press against the upper surface of the tubular part 51 and closes the opening 58 therethrough. If pressure is generated above the check valve 50, for instance by actuating the trigger 21 and collapsing the bellows 19, such pressure will push the cover 52 still tighter against the upper surface of the tubular part 51 and create a still better seal for the duration of such pressure.
If a vacuum is created above the check valve 50, for instance by expanding the bellows 19 and not immediately admitting air into the expanded volume created thereby, the pressure difference above and below the check valve 50 will cause the second part 54 of the cover to rotate upwards around the hinge 57 as shown in FIGS. 15 and 17 thereby opening passage 58 and enabling liquid to flow from the container 14 generally through a dip tube 60 positioned in the lower part of the body 16, through the passage 58 and enter the interior of the pump chamber 19a. As best shown in FIG. 4, an air hole 61 having a lead-in funnel 62 extends through the screw cap 27. The lower part of the air hole terminates in a groove 63 on the inner surface of the screw cap 27 which allows airflow from the outside atmosphere through the air hole 61 into the container 14. In those cases where a cap liner 64 is utilized, such groove 63 extends therethrough as shown.
In the rest position of the pump, the air hole 61 is closed by a post 64 extending downward from a bottom ridge 66 of one of the walls 20 of the bellows 19, said post 65 being pressed firmly into the air hole 61 by the memory of such wall 20, but not of a force sufficient to dislodge the friction fit between the body 16 and the screw cap 27.
The dip tube 60 is press fitted into an extension 67 at the lower end of the body 16 and serves to direct the liquid from the interior of the container 14 into the pump chamber 19a which includes that volume enclosed by the assembly of body 16 including bellows 19, outer shell 15 and the check valve 50. The extension 67 terminates in a step 68 with a small orifice 69 leading to the passage 52 in the tubular part 51 of the check valve 50, such step 68 preventing the dip tube 60 from being positioned too far into the body 16 and thereby dislodgeing the check valve 50 from its seat in the lower part of the body 16.
The screw cap liner 64 is an optional component and can be replaced, depending on the surface of the container 14 to be sealed, by one or more annular sealing lips as will hereinafter be apparent in the explanation in connection with FIGS. 12-22. Such lips are integral with the inside bottom of the screw cap. The seal is obtained upon screwing the screw cap 27 completely on the neck 12 of the container 14, thereby compressing either the screw cap linear 64 or the annular sealing lips.
As previously indicated, the outer shell 15 is provided with a molded hollow extension 42. This extension includes a internal passage 70 connecting the exit slot 39 and the opening 37 closed by the hook 36 with the discharge orifice 71 of the extension 42 of the outer shell 15. The passage 70 includes a discharge orifice 71 which may be provided with any one of series of known configuration dispensing nozzles 48 for purposes of providing the desired spray pattern of the contained liquid to be dispensed.
The body 16 and the check valve 50 may be made of any one of several available moldable materials with good resistance to flexural fatigue at the bellows ridges, good resistance to flexural creep under continuous load for maintaining the spring tension on several of the contructional components including tension of the gooseneck hook 36 and the check valve hinge 57 and good chemical resistance to the general types of liquids to be dispensed. Materials meeting these requirements are certain polyolefins and acetal resins, but many others may be suitable. The screw cap 27 and the outer shell 15 allow still wider freedom in the material selection including the wide range of materials that meet the chemical resistance requirements. They can also be molded of any one of many available materials, such as most polyolefins, and the choice of material would be mainly governed by economic consideration.
Operation of the pump 10 is as follows: with reference to FIG. 2, the check valve 50, the discharge valve 40 and the airhole 61 are closed. When it is desired to actuate the pump, the trigger 21 is manually pressed causing the bellows 19 to at least partially collapse. The air inside the pump chamber 19a is compressed and escapes through the discharge valve 40, past the thin shield 43 which is bent away from the proximal portion 44 of passage 70 by the pressure of the escaping air as soon as the discharge valve 40 opens. Opening of the discharge valve 40 is delayed until the movement of the trigger 21 and collapsing bellows 19 has sufficiently straightened out the bent gooseneck 34 and then moved the pad 38 on the hook 36.
This delay in opening the discharge valve 40 until the trigger 21 has traveled a certain distance aand the bellows 19 is partially collapsed assures that the liquid in the pump chamber 19a is under pressure before the dispensing starts. This pressure distends slightly the walls 20 of the body 16 and to the outer shell 15 and compresses any air or other gas remaining in the pump chamber 19a and thereby stores the energy applied by the finger pressing the trigger. Once the discharge valve 40 opens, this stored pressure forces the liquid through the passage 70 to the dispensing nozzle 48 thus enabling a good dispersion and fine spray pattern of the liquid to be dispensed.
The pressing of the trigger also opens the airhole 61 but no air movement through it is likely to occur at the initial trigger pressing because pressure equlibrium between the surrounding atmosphere and the inside of the container 14 is likely to exist. The check valve 50 is closed still tighter than normal due to the increased air pressure in the pump chamber 19a above it.
The disposition of the various components with the trigger pressed inwards is shown in FIG. 3. Upon releasing the trigger 21, the thin shield 43 snaps back against the wall 44 to prevent a rush of air from the outside into the pump chamber 19a through the exit slot 39 before said exit slot 39 is closed by the pad 38. The pad by reason of its vertical movement with respect to the exit slot 39 is capable of completely blocking such off or permitting flow of either liquid or air therethrough. The downward force on the gooseneck by reason of the bellows collapse produces this vertical movement and thus enables the pad to slide with respect to the exit slot 39 to open and close such for liquid flow, inward air flow being prevented by the normally closed position of the shield 43.
The bellows 65 thereafter expands due to the memory of the hinges connecting its wall 20, thus creating a partial vacuum inside the pump chamber 19a. The pressure inside the container 14 is now greater than in the pump chamber 19a. This pressure is sufficient to open the check valve 50 by rotation of the second cover part 54 about the second hinge 57 and draws liquid from the container 14 through the dip tube 67, through the passage 58 and into the pump chamber 19a. During the initial part of this return movement of the trigger 21 and bellows 19, the airhole 61 is still open, and the volume of the liquid that is drawn up into the pump chamber 19a is replaced by air until the post 65 closes the air hole 61. If this closing of the airhole 61 occurs before the full amount of liquid is drawn up into the pump chamber 19a, a very slight vacuum will exist in the headspace of the container 14, but such generally is insignificant when compared with the partial vacuum inside the pump chamber 19a.
Turning now to FIGS. 23, 24 and 25, a still further constructional embodiment of the present invention is depicted. The finger actuated pump 210 therein shown essentially operates in the manner as previously described in connection with the embodiment shown in FIGS. 1 through 11. In this regard, the pump 210 is shown disposed on the neck 212 of a container 214 containing the selected liquid to be dispensed. The pump includes a housing 213 which in turn includes a shell 215, a product discharge assembly 216 and a cover or cap 217 each formed separately and then interconnected as a unit so as to provide the necessary rigidity to the housing 213. The housing in turn is adapted to receive a bellows assembly 219 which includes rigid opposite upper and lower ends 219a and 219b. The lower end 219b serves to house a check valve 250 assembled as by frictional fit thereinto. The rigid lower part 219b of the bellows 219 is further provided with a bore in which a check valve assembly 250 is disposed as by frictional fit. The bore also receives a hollow dip tube 218 so as to conventionally communicate with the liquid within the container 214. A threaded screw cap 227 is positioned over the similarly threaded neck 212 of the container 214 and is further provided with an open center opening 228 through which an upwardly directed extension 229 is positioned. The extension 229 is further provided with an internal circular bore adapted to receive the preferably circular outer surface of the lower bellows part 219b. Such parts may be positioned with respect to each other by known means such as frictional fit. The top surface of the screw cap 27 forces sealing flange portions 230 of the extension 229 into contact with the upper circular edge of the neck 212 so as to provide an effective liquid seal therebetween.
The upper rigid end 219a of the bellows 219 is also preferably circular for ease in orientation and is provided with an inwardly extending bead 223 which is adapted for snap engagement into a groove 224 provided within a tubular extension 222 downwardly extending from the product discharge assembly 216. In this way then, the component parts of the pump 210 may be assembled in sealing relationship with respect to each other by known relatively straightforward assembly techniques.
The bellows 219 is depicted as including intermediate walls 200 including a front wall 235. The front wall 225 is of relatively rigid construction such that a trigger 221 may be rigidly integrally attached thereto along vertical, that is, longitudinally orientated surface portions thereof. The front wall 235 is generally vertically, that is, longitudinally disposed in its non-compressed rest position. In this regard, it should be pointed out that the bellows 219 although depicted as being formed of hingedly connected wall sections 220 may be formed of a more conventional bladder type construction so long as such bladder does not exhibit balloon type expansion upon its compressive collapse by the trigger action that will hereinafter be described. The bellows 219 whether formed of pleated construction or the aforementioned bladder type construction also necessarily exhibits a front wall which is relatively rigid at least over that portion thereof to which the trigger is attached. The bellows 219 as illustrated is preferably formed of polypropylene by injection molding. Accordingly as used hereinafter and as set forth in the claims, the term bellows may refer to either of the aforementioned constructions or their equivalent.
An essentially flexible thin wall portion 245 of the bellows 219 serves to connect the upper portion 219a thereof to the rigid front wall 235. In this regard, such connection essentially forms a pivot area which is above the trigger and which is easily deformed so that little or no force from the trigger during its actuation movement is transmitted to the sealed area at the upper end of the bladder 219 where the inwardly directly bead 223 is frictionally snap engaged within the extension 222. It may also be apparent that the thinned hinge area 245 is also inwardly downwardly directed, i.e. curved, such that the entire force albeit a reduced force transmitted thereto by the trigger movement is not completely made up of a straight down force component but more of a bending action such that very little downward force is applied to the aforementioned upper sealed area between the bellows and the housing 213.
The check valve 250 includes a generally partially spherical sealing surface 251 which is normally positioned in engagement with a valve seat 252 formed in the lower part 219b of the bellows 219 by a spring member 253 attached at its upper end to the body 254 of the valve. The spring member is generally under some compression such that the sealing portion 251 must be upwardly forced against the spring member 253 so as to permit fluid to move into the chamber within the bellows 219 upon its expansion after actuation of the trigger 221 in the manner previously described in relationship to the FIG. 1 through 11 embodiment.
The product discharge assembly 216 includes a discharge tube 236 in which a discharge valve 237 constructed similar to the check valve 250 is positioned. The valve seat is formed by a reduced diameter bore 238 formed within the exit tube 236. The bore is however of a pronounced elongated extent. The forward end of the valve 237 is provided with an elongated member 239 adapted to be slidably received within the bore 238, it being clear that there is sufficient longitudinal contact between member 239 and the bore 238 to enable some rearwardly, that is, compression motion to be imparted to the valve spring 240 prior to the opening thereof. This action enables a threshold pressure to be built up within the bellows chamber prior to the opening of the product discharge valve 237.
An air hole 261 extends through the extension 229 of the screw cap 227 so that air from the outside atmosphere may flow therethrough into the container 214. In the rest position of the pump 210, as shown in FIG. 23, the air hole 261 is closed by a post 265 extending dowardly from the bottom of the front wall 235 of the bellows or one of the pleated walls 220 thereof. The post 265 in this closed position is pressed firmly into the air hole 261 by the plastic mold memory thereof. As in the previously described embodiment, when the trigger has been actuated a sufficient degree and as herein illustrated in the transition between FIGS. 23 and 24, the resultant collapse of the bellows 219 enables the post 265 to rock upwardly to a slightly open position so as to admit air to the inside of the container 214 and thus equalize the pressures therebetween.
The product discharge assembly 216 further includes energy absorbing means in the form of a first generally tubular member 277 downwardly extending into the chamber of bellows 219 in such a position that interior portions of one of the pleated wall sections 220 contacts one side of the tubular member 277 at least when the trigger is actuated. Member 277 further includes longitudinally oriented pleats 279. The member 277 is of closed wall configuration such that product within the bellows chamber is not forced thereinto and serves a twofold purpose. Initially, the member 277 reduces the volume inside the bellows chamber so as to reduce the amount of liquid or semi-liquid product that need be present therein to provide the necessary discharge capacity. In addition, the tubular member 277 by reason of its hollow construction and additionally by reason of its pleats 279 partially collapses under the pressure applied thereto by its coaction with the pleated wall 220 and/or by the liquid pressure applied thereon. In this manner, the member 277 in effect stores energy such that when the trigger 221 is released after being actuated, i.e. released from the FIG. 24 position, the outward movement of the member 277 to its normal uncollapsed position tends to maintain a pressure upon the liquid within the bellows chamber so as to extend or even-out the discharge cycle thereof. A secondary tubular member 280 may also be provided; however, such secondary tubular member is not contacted by the pleated wall 220 but is compressed solely by reason of the force applied thereto by the non-compressible liquid within the bellows chamber. In this manner, the primary tubular member 227 will collapse initially and the secondary tubular member 280 thereafter so as to provide somewhat sequential sources of stored energy. In this regard, the tubular members 277 and 280 tend to act as springs or shock absorbers to even-out the compression cycle formed by actuation of the trigger 221.
In another alternative constructional embodiment disclosed in FIGS. 12-22, a finger actuated pump 10a is shown on the neck 12 of a container 14 containing the selected liquid to be dispensed. The pump 10a includes a body 80 with rigid upper and lower apertures defined by rims 81 and 82 and having between these apertures a plurality of conical walls 83 interconnected with each other, and forming a bellows 84. The walls of the bellows are integrally and hingedly interconnected in a fluid-tight manner and disposed at angles which can easily be decreased by applying along the longitudinal axis thereof so as to at least partially collapse the bellows 84. The lower aperture 82 of the body 80 is closed by the check valve 50 assembled by friction fit into the lower part thereof and operative in the same manner as with pump device 10.
The gasket 86 is prevented from slipping off the conical section 92 and onto the stem extension 91 by reason of the upper rim 81 of the body 80 pressing against the area surrounding the central hole 89 thereof. Such pressure causes a liquid-tight seal between the rim 81 and the sealing gasket 86. The pressure for this sealing action is supplied by the plastic memory of the bellow 84. The bellows is in turn enclosed in a space 98 below the gasket 86 and the actuator 87 and between the walls of a screw cap 99 and a cap extension 100. Such cooperative assembly is prevented from upward movement by the inner surface of the top 101 of the extension 100 retaining an annular rim 102 at the base of the outer wall of the actuator, said rim 102 being too large to pass through an upper aperture 103 in the cap extension 100. The cap 99 is adapted to receive a liner 104, said liner having a tubular extension 105 pressfitted into the cylindrical cap extension 100. The liner further includes an inwardly directed portion 106 terminating in an opening 107 into which the lower rim 82 of the bellows is adapted to fit. The portion 106 contacts the rim 82 in such a manner to axially precompress bellows 84. The space 98 accordingly has an internal height less than the original height of the bellows 84 prior to its assembly into the cap extension. The bellows is thus compressed to a degree sufficient for the generation of aforesaid pressure for the sealing action between said upper body aperture formed by the rim 81 and the sealing gasket 86 and for additionally maintaining the sealing gasket in its deformed conical shape pressed against the concial section 92. Such pre-compression of the gasket also provides the sealing action between the outer periphery of the gasket and a circular sealing lip 108 downwardly extending from inside the top wall 109 of the cap extension 100.
The periphery of the sealing gasket is pressed in the rest position of the pump 10a upwardly against the circular sealing lip 108 inside the top wall 109 of the cap extension 100. Such cooperation between the periphery of the sealing gasket and the circular sealing lip 108 forms a liquid tight seal for an air passage 112 formed as best shown in FIG. 14 between the actuator and the cap extension. The pressure for said sealing action is also supplied by the memory of the bellows pressing continually urging the sealing gasket upwards.
When the assembly including the sealing gasket and the actuator is moved downward relative to the screwcap, the seal for the air passage 112 opens for admission of air into the space 98 and from there into the container 14 through an open vertically orientated airhole 113 in the plugliner portion 106. In order not to interfere with the bottom of the conical walls 83 of the bellows 84, such air hole 113 may include a lateral portion 114. The airhole in the plugliner may, in an alternate construction shown in FIG. 20, be sealed in the rest position of the pump by a post 115 extending downward from the lowermost wall of the bellows 84 through an airhole passage 116, the post 115 fitting tightly into the passage 116 in the closed sealing position shown.
When the bellows is collapsed, the post 115 is pushed downward, and a longitudinally orientated groove 117 in the post 115 slides from its rest position above the airhole passage 116 into the passage 116 with its lower end extending through the plugliner into the container 14 while the upper end of said groove 117 is still in the space 98 above the plug liner so as to connect the airspaces above and below the plug liner. It should be clear that the groove 117 is longer than the width of the liner 104 so as to span air passage 116 therethrough.
The diameters and heights of the individual sections of the bellows 84 do not have to be identical. It may be desirable, however, for ease of manufacturing to keep the wall thickness of all bellows sections constant. It is also possible to influence the sequence in which the individual sections of the bellows collapse by varying the outer diameters of such individual sections, i.e. sections with larger outer diameters collapsing before sections with smaller outer diameters. It is also possible to vary the heights of such individual sections, sections with lesser height collapsing before sections with greater height but of essentially equal outer diameter. Such sequential collapsing of the individual sections of the bellows can be used to influence the order in which the various functions of the bellows are performed, such as moving the post 115 through the airhole 116, or pushing the upper section of the bellows against the lower surface of the gasket 86 to further deform said sealing gasket and open up its central hole (increase its cone angle).
The lower flat surface of the plug liner 104 may have one or more annular sealing lips 120 integral therewith so that a seal is obtained upon screwing the screw cap 99 completely on the neck 12 of the container 14, thereby pressing the liner 104 against the upper surface of the neck 12 and compressing the annular sealing lips 120.
The dip tube 60 is pressfitted into an extension 67 at the lower end of the body 80 and serves to direct the liquid from the interior of the container 14 into the pump chamber 121 defined as the volume enclosed by the body bellows 84, the lower check valve 50 and the discharge valve assembly comprising the sealing gasket 86 and the actuator 87.
The sealing gasket 86 may be molded or stamped out of any one of many available materials with good resistance to flexural creep under continuous load for maintaining its memory of its orginal shape, sufficient softness for effective sealing against the harder surfaces of the actuator and the screw cap, and good chemical resistance to the general types of liquids to be dispensed. Among the materials meeting these requirements are certain polyolefins and some of the harder polyurethane elastomers, but many others may be suitable.
The screw cap 99, the liner 104, and the actuator 87 allow still wider freedom in the material selection among the wide range of materials that meet the chemical resistance requirements. They can be molded by any of many available materials such as most polyolefins, and the choice of material would be mainly governed by economic considerations.
With the disposition of parts shown in FIG. 13, the check valve 50, the discharge valve 85, and the seal for the air passage 112 are closed. When it is desired to prime the pump 10a, the actuator 87 is pressed downwards by the finger, the bellows 84 collapses and the air inside the pump chamber 121 is compressed and escapes through the discharge valve 85 as soon as such discharge valve opens. The discharge valve 85 is opened by urging the outer periphery of the gasket with respect to its center relatively upwards so as to increase the angle of its conical central opening 89 and thus assure that the inner walls defining such opening move away from sealing contact with the conical surface 92. This action is accomplished as best shown by FIGS. 18 and 19 wherein the upper shoulder 93 of the actuator 87 and upper rim 81 of body 80 serve to in effect capture interior central portions of the gasket between them. When the actuator 87 is depressed, it forces the central portion of the gasket down, thus also initiating collapse of the bellows. Inasmuch as it is the central bellows portions which are normally squeezed together, the bellows becomes initially centrally shortened permitting the central portions of the gasket to move downwardly not only in an overall sense but also with respect to the outer periphery thereof.
It is also possible to stop the downward movement of the periphery of the sealing gasket by a cooperating surface of the liner extension 105. Accordingly the upper rim 122 of the tubular extension may be dimensioned so as to form an obstruction in the downward path of the outer periphery of the gasket. Such alternative construction is shown in FIGS. 21 and 22.
This delay in opening the discharge valve 85 until the actuator 87 has traveled a certain distance assures that the liquid in the pump chamber 121 is under pressure before the dispensing starts. This pressure distends slightly the walls of the bellows and compresses any air or other gas remaining in the pump chamber, thereby storing the energy applied by the finger pressing the actuator 87. Once the discharge valve 85 opens, this stored energy forces the liquid to the dispensing nozzle 48 and causes a good dispersion and fine spray pattern as the liquid exits the pump 10a. In such attitude, the check valve 50 is closed still tighter than normal due to the increased pressure in the pump chamber 121 above it. The air passage 112 is open and in the alternate construction shown in FIG. 20, both the air passage 112 and the air passage 116 are open, but no air movement through it is likely to occur upon initial actuation because pressure equilibrium between the surrounding atmosphere and the inside of the container 14 is likely to exist.
The disposition of the parts with the actuator pressed downwards is shown in FIGS. 19, 20, and 22 dependent on the alternate constructional embodiments. Upon releasing of the actuator, the bellows expands due to its memory and the center of the sealing gasket is pushed upwards relative to its outer periphery. This action reseals the discharge valve 85 and prevents a substantial amount of air from entering the pump chamber 121 through the discharge passage 97, the channel 95 and the orifice 96. The expansion of the bellows 84 creates a partial vacuum inside the pump chamber 121. The pressure inside the container 14 is now greater than in the pump chamber 121. This pressure difference opens the check valve 50 so as to draw liquid from the container 14 through the diptube 60 and through the passage 58 in the checkvalve and then into the pump chamber 121. During this return movement of the actuator and the bellows, the air passage 112 is still open, and the volume of the liquid that is drawn up into the pump chamber is thus replaced until the gasket presses against the circular sealing lip 108 and thereby seals the air passage 112.
18. The pump construction of claim 1, said bellows having relatively straight intermediate walls characterized by the absence of major undercut portions projecting therefrom and wherein said bellow is of integral injection molded construction.
19. The pump construction of claim 1, said collapsible bellows having a plurality of integral wall segments.
US06125083 1977-07-28 1980-02-25 Finger actuated pump assembly Expired - Lifetime US4336895A (en)
US05819880 US4201317A (en) 1977-07-28 1977-07-28 Finger actuated pump assembly
US06125083 US4336895A (en) 1977-07-28 1980-02-25 Finger actuated pump assembly
US05819880 Continuation-In-Part US4201317A (en) 1977-07-28 1977-07-28 Finger actuated pump assembly
US4336895A true US4336895A (en) 1982-06-29
ID=26823241
US06125083 Expired - Lifetime US4336895A (en) 1977-07-28 1980-02-25 Finger actuated pump assembly
US (1) US4336895A (en)
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