Modular, adjustable force, all-polymer helical biasing member and pump dispenser comprising same

Abstract

The invention relates to a dispenser pump having a modular biasing unit made entirely of plastic. The modular units in the biasing member can be arranged in a nested configuration, an abutting configuration or a hybrid configuration in order to allow for different amounts of spring force, suction force and / or dose size to be delivered by the pump, depending on the configuration of the modular units. The invention also relates to a method for fine-tuning and manufacturing dispenser pumps for these purposes.

Description

Technical Field

[0001] This application generally relates to pump dispensers, and more specifically, to polymer pump dispensers that are free of metal parts and comprise a plurality of stacked helical bellows arranged to allow for adjustment of axial height and corresponding spring forces applied by the resulting biasing member. Background Technology

[0002] Containers for everyday household fluid products (such as soap, detergents, oils, consumable liquids, etc.) can be equipped with dispensing pumps to improve consumers' ability to access and use fluids. This type of dispensing pump typically relies on a reciprocating pump driven by a compressible metal biasing member.

[0003] These products tend to be single-use, raising concerns about sustainability. Regulators are increasingly requiring consumer goods manufacturers to use product packaging and designs that are easily recyclable. For businesses that rely on pump dispensers, designing products made entirely of polymeric materials is becoming increasingly important. In this way, such “all-polymer” pumps can be recycled without the need to disassemble and / or separate metal parts and components made of materials that are difficult to recycle (e.g., metal or foil parts, thermosetting resins, specialized elastomers, and other materials that cannot be recycled or require temperatures and conditions incompatible with those used in other parts of the design for recycling).

[0004] When it comes to creating designs for all-polymer reciprocating pumps, or more preferably single-polymer reciprocating pumps, a second more problematic component is the anti-drip nozzle and the biasing member. The anti-drip nozzle is sometimes made of an elastomer, but because this is an optional feature, the design can simply eliminate this function or rely on solutions proposed, for example, in U.S. Patents 8,960,507, 10,252,841, 10,350,620, 10,717,565, and 10,723,528 (all of which are incorporated herein by reference). The biasing member is often more difficult to work with because a metal spring provides a cost-effective and reliable means of generating the necessary biasing force inherent in the operation of a reciprocating pump.

[0005] One well-known method relies on "bellows" type components, such as those disclosed in Patent Cooperation Treaty Publication WO1994 / 020221A1 and U.S. Patents 5,819,990 and 5,924,603 (which are incorporated herein by reference). Accordion-shaped or spiral bellows serve as the pump rod or are positioned around the pump rod and offset the pump head away from the closure cap. In some respects, prominent reinforcing ribs and convex sidewalls provide sufficient elasticity to improve the reliability and repeatability of reciprocating forces.

[0006] It is worth noting that a separate type of bellows-like structure is known, similar to the structure shown in U.S. Patent Publication 2006 / 0115213A1. However, these "dust jackets" differ significantly in structure and function because they are designed to confine grease or other viscous substances around moving parts in an automobile. While these bellows can provide flexibility, they cannot be used as biasing members and are unsuitable for use in reciprocating pumps.

[0007] Other suggested solutions for non-metallic springs can be found in Japanese Patent Publication 2005024100A, Patent Cooperation Treaty Publication WO 2001 / 087494A1, 2018 / 126397A1 and WO The following patents are found: 2020 / 156935A1, French Patent FR2969241B1, Korean Patent KR102174715B1, US Patent Publications 2009 / 0102106A1, 2012 / 0325861A1, 2015 / 0090741A1, 2017 / 0157631A1, 2019 / 0368567A1 and 2020 / 0032870, and US Patents 5,819,990, 6,068,250, 6,113,082, 6,223,954, 6,983,924, 10,741,740 and 10,773,269. Generally, these publications envision arrangements in which accordion-shaped or wire-like plastic strands are provided and arranged to serve as an alternative to conventional metal coil compression springs. However, these arrangements may require either compression or extension configurations, which cannot be used as a direct replacement for the metal coil compression springs currently used in many reciprocating pump designs. Furthermore, some of these configurations may require consideration of manufacturing and lifespan.

[0008] Another challenge with all these previously known solutions (whether polymeric or metallic) is that the spring construction is not well-suited for fine adjustments. That is, the spring force of a wound metal spring of a specific diameter and / or the spring force of a bellows or deformable-wall polymer spring can be difficult to adjust without completely changing the spring's dimensions. In the case of polymer springs, such adjustments would require changes to thickness and / or other dimensions, necessitating entirely new molds / manufacturing processes. It is worth noting that adjusting the spring force is crucial for fine-tuning the dispenser's functionality and pumping characteristics. This fine-tuning is important when intending to dispense fluids of different viscosities (higher viscosity fluids require different spring forces to generate suction compared to lower viscosity fluids).

[0009] Given the above, pump-type dispensers made of easily recyclable polymeric materials would be welcome. In addition to a pump design that eliminates the need to disassemble parts and separate them into individual circulating flows, a biasing member that allows adjustment of the applied spring force is also required. Attached Figure Description

[0010] The accompanying drawings form part of this specification, and any information in the drawings / figures is both literally included (i.e., actual specified values) and relatively included (e.g., ratios of corresponding dimensions of parts). In the same manner, the relative positions and relationships of the components shown in these drawings, as well as their function, shape, size, and appearance, can further inform certain aspects of the invention, as if completely rewritten herein. Unless otherwise stated, all dimensions in the drawings are referenced to inches, and any typographical information in the drawings / figures forms part of this written disclosure.

[0011] All of these are incorporated in the accompanying drawings and attachments as part of this disclosure:

[0012] Figure 1 This is a three-dimensional perspective view of a biasing component suitable for use in a reciprocating pump, based on certain aspects disclosed herein.

[0013] Figure 2A It is a perspective line drawing. Figure 2B Both are side views of a line graph. Figure 1 The biasing member shown.

[0014] Figure 3A yes Figure 1 Perspective side view of the offset component. Figure 3B It is along Figure 3A The perspective cross-sectional view of the bias member shown is taken from the diameter. Figure 3C yes Figure 3A The supplementary perspective side view of the biasing member shown after rotating it 45 degrees about its central axis. Figure 3D It is along Figure 3C The perspective cross-sectional view of the bias member shown is taken from the diameter.

[0015] Figure 4 Is Figure 1 The three-dimensional perspective cross-section shown is taken near the midpoint of the central axis of the offset member, thus highlighting the axial channel with a reduced wall thickness compared to other wall sections in the same plane.

[0016] Figure 5A It is a top-down plan. Figure 5B Both are bottom-view plan views. Figure 1 The biasing member shown.

[0017] Figure 6A It includes Figure 1 A three-dimensional perspective view of the reciprocating pump with biasing components shown. Figure 6B It is a partial quarter-section view (but retains the complete non-cross-section view of the offset member and valve stem). Figure 6CIt is its full quarter-section view (so that the biasing member and valve stem are shown in quarter-section).

[0018] Figure 7A It is a cross-sectional perspective view. Figure 7B Both are cross-sectional side views. Figure 6A The pump shown.

[0019] Figure 8A This is a three-dimensional perspective view of a truncated biasing member suitable for use in a reciprocating pump according to certain aspects of the invention. Figure 8B yes Figure 8A The front perspective view of the offset member, which is axially bisected (i.e., the half in the background has been removed), highlights the variable shape of the holes and elongated openings.

[0020] Figure 9A It is a side view plan. Figure 9B These are cross-sectional views, both of which are "double" stacks of modular units. These figures are drawn to scale to show the differences in axial height that can be achieved by the order in which the modular units are stacked.

[0021] Figure 10 This is a cross-sectional side view of a "triple" stack of modular units. As mentioned above, the figure is drawn to scale to show the differences in axial height that can be achieved by the order in which the modular units are stacked. Detailed Implementation

[0022] The operation of the invention will be better understood below with reference to the accompanying drawings, detailed description, drawings, claims, and abstract, all of which form part of this written disclosure. While specific aspects and embodiments are contemplated, it should be understood that those skilled in the art will be able to adapt and / or substitute certain teachings without departing from the basic invention. Therefore, this disclosure should not be construed as unduly limiting the invention.

[0023] As used herein, the terms “example” and “exemplary” refer to instances or illustrations. The terms “example” or “exemplary” do not indicate key or preferred aspects or embodiments. Unless the context otherwise requires, the word “or” is intended to be inclusive rather than exclusive. For example, the phrase “A uses B or C” includes any inclusive permutation and combination (e.g., A uses B; A uses C; or A uses both B and C). On the other hand, unless the context otherwise requires, the articles “a” and “one” are generally intended to mean “one or more”.

[0024] U.S. Patent 10,549,299 and U.S. Patent Publication 2018 / 0318861, as well as Patent Cooperation Treaty Applications Nos. PCT / EP2020 / 070871 and PCT / EP2020 / 070878, disclose various designs and components of dispenser pumps that can be constructed entirely from polymers and recyclable materials. These disclosures are incorporated herein by reference as if fully reproduced herein, thereby notifying and supplementing this disclosure in terms of material selection, construction, process, and various other aspects of this disclosure, as well as any claims based thereon.

[0025] One difference between these designs lies in the spring mechanism. Specifically, these designs all rely on the repetition of cylindrical walls with a segmented top plate that is elastically deformable. When axial forces are applied and released along this top plate, fluid may be drawn into the internal void defined by the column / plate combination. While this arrangement works well, its geometry dictates a relatively flat, elongated disc shape that is difficult to incorporate into commonly used reciprocating pumps, in which a metal coil compresses the spring and positions it around the reciprocating rod (see, for example, U.S. Patent 8,827,121). When using these springs, the diameter of the coil can be reduced without sacrificing spring force and suction power. In turn, the reduced diameter makes the spring and pump combination suitable for use in narrow-neck containers (i.e., neck diameters of 28 mm, 33 mm, and 38 mm), which are most common and preferred in the consumer market.

[0026] Previous attempts to incorporate conventional bellows springs into these narrow-neck designs have not been entirely successful. The arrangements disclosed above fail to generate sufficient, reliable spring force / suction within the coverage area required by many existing and preferred pump and container neck dimensions. Most of these arrangements also require "reinforcing ribs" and fully formed convex walls, all of which require additional material and can lead to undesirable performance characteristics (in terms of maintaining sufficient spring force / suction over extended periods). From an aesthetic standpoint, bellows have proven difficult to integrate into the housing, as this concealed spring design is used in many pump designs that rely on metal coil springs.

[0027] The inventors have now discovered that by reconfiguring the shape and relative wall thickness of the bellows-type element, a plastic biasing member can be manufactured for use in narrow-neck pumps and / or conventional reciprocating pumps, wherein the biasing member is assembled around a telescopic rod. This arrangement avoids the need to rely on the walls of the bellows as part of the flow channel.

[0028] The design itself requires a truncated conical cylindrical body, in which imaginary, offset, concentric helical traces serve as characterizing features. Specifically, the outer helical trace is offset from the inner helical trace by approximately 180 degrees. Compared to the bottom, both traces have smaller diameters at the top of the shape, and the spacing between each trace is complementary to maintain a consistent shape along the entire axis (note that "axis" refers to an imaginary line running vertically through the cone / cylinder). Notably, no reinforcing ribs are formed; instead, each trace is interrupted regularly and periodically by perforations or formed adjacent to perforations, as described below.

[0029] Wall sections are provided along these external and internal spiral tracks and between these sections. However, a perforated pattern is provided so that the walls do not serve as fluid barriers and cannot serve as fluid barriers (i.e., the biasing member is not a conduit for fluid, as can be found in some conventional all-plastic designs described above).

[0030] Furthermore, the thickness of the walls forming these sections decreases regularly and intentionally along selected surfaces. For example, assuming the holes and openings below are not yet formed in the column / cone, one or more channels (preferably two or four opposite each other) are provided in the wall sections in which the holes and / or openings are formed (see below). These channels extend vertically downward along the surfaces on which they are provided, and the inner surfaces are preferably flush (i.e., so that the channels are visible from the outside). In addition, the channels are preferably regularly and / or equally spaced, and a portion of the thin section overlaps with one or two sets of axially aligned perforations.

[0031] Specifically, a series of axially aligned, curved, circular, or elliptical holes are formed, preferably along 2, 3, 4, 5, 6, 7, or 8 equidistant arc segments of a cylinder / cone. A set of individual polygonal holes (e.g., trapezoidal, square, triangular, rectangular, curved equivalents, etc.) are scattered / positioned among these holes, preferably along the same number of arc segments. This arrangement ensures that both the outer and inner spiral traces are interrupted by the holes or orifices, although the inner spiral traces may be located near the edge of each hole. Similarly, when present, thin channels will bisect the holes and / or orifices, with the inner spiral traces passing through the solid portion of the channel. In summary, these holes and orifices can be referred to as separate axially aligned perforation groups.

[0032] Each group of axially aligned perforations gradually increases in size from the top of the cylinder / cone downwards. That is, at least one of the length, width, radius, and / or diameter of the selected shape (hole or aperture) gradually increases. Therefore, in the selected group set within the arc segment, the total surface area of ​​the perforation (hole or aperture) closest to the top will be the smallest, and this area will increase to the maximum in the perforation closest to the bottom. However, in some respects, the holes can maintain the same surface area and / or the apertures can remain unchanged.

[0033] In this way, a continuous perforated wall surface is formed from the top to the bottom of the column / cone. However, only a selected number of arc segments on the column / cone include vertically aligned wall sections that extend continuously from top to bottom. Similarly, only those sections vertically positioned between the holes define horizontal support members, while the corresponding sections positioned between the holes define inclined, skewed, or diagonal support members. Notably, the continuous vertically aligned sections have a diameter corresponding to either the outer spiral track (as shown) or the inner spiral track, such that the inclined support member corresponds to the other track (e.g., the inner spiral track, as shown).

[0034] This configuration of the helical traces and wall sections provides a “corrugated but perforated” arrangement for the surface of the offset member. Notably, this arrangement causes both the outer and inner helical traces to be interrupted by perforations (i.e., not just solid walls as they spiral along the cylinder / cone). Furthermore, both the outer and inner helicals will have increased radii (as measured from the center point / central axis of the cylinder / cone). However, in a preferred embodiment, the minimum radius of the outer helical trace is equal to or greater than the maximum radius of the inner helical trace. Additionally, inclined support members are radially distributed above and below the horizontal supports, while a defined number of vertical supports (twice the number of hole groups, e.g., 8 vertical supports for 4 hole groups) connect these inclined and vertical supports, while defining the holes and the edges of the openings.

[0035] Finally, individual flanges provide flat interfaces at the top and bottom of the column / cone. These interfaces may include recessed shapes separated / defined by radial ribs and inner and outer circular walls at the top. The bottom may include axially extending flanges or sidewalls with notches or connecting structures on the outer and / or inner radial faces, the notches being vertically aligned with the central axis of the column / cone. These top and bottom flanges, and any other shapes or features therein, can secure springs within a wider pump, as described below.

[0036] This corrugated yet perforated arrangement provides sufficient elasticity and biasing force while reducing weight and material usage. Without being constrained by operational theory, the biasing member of this invention contains no material that allows the user to more easily compress the spring, unlike conventional solid bellows where the volume of solid material is more difficult (if not impossible) to fully compress. Notably, the specific arrangement of the vertical, inclined, and horizontal members ensures that the biasing member will return to its original shape without rotating or twisting to the extent that the biasing member itself is damaged in some way (fractured member, displacement from its original position, etc.).

[0037] The aforementioned biasing component can be injection molded from a single polymeric material, similar to or the same as the other components. Polypropylene, polyethylene, and other compatible and / or similar recyclable polymeric resins are particularly useful.

[0038] Regarding the helical nature of the bias member, the description of a particular chiral configuration is not intended to be restrictive. Therefore, both left-handed and right-handed helices are possible, as long as the inner and outer helical traces remain complementary (i.e., both extend in the left-handed or right-handed direction).

[0039] Turn now Figure 1-5B The offset member 100 has a generally cylindrical shape, and the sidewall section 200 approximately conforms to a truncated conical surface. A flange 300, including a top 310 and a bottom 320, defines the top and bottom edges of the member 100. The column itself includes a central axis CC.

[0040] Flange 310 may include radial ribs 312, as well as inner radial walls 314 and outer radial walls 316. Together, these features define different and possibly repeating shapes 318 (e.g., a curved trapezoid, as shown in the figure) within the horizontal surface of flange 310.

[0041] Flange 320 may include an axially extending wall 322. At least one face (inner or outer face) of wall 322 is formed with spaced-apart channels or recesses 324.

[0042] Although features 312, 314, 316, and 318 are associated with flange 310, it should be understood that these features can also be provided on flange 320. Similarly, features 322 and 324 can be incorporated into flange 310. In some respects, wall 324 can coincide with radial wall 318, such that all the aforementioned features are provided to one or both flanges 310 and 320.

[0043] As described above, the thin-walled segment 210 extends along the axial length of segment 200. The outer helical trace 220 spirals around segment 200 at a spacing complementary to that of the inner helical trace 230 (i.e., the angle of the trace relative to the imaginary horizontal plane of segment 200). Holes 240 and 250 are arranged in axially aligned groups (four in each group, as shown) to interrupt the helix 220, while the helix 230 passes along the edge of the hole 250. Holes 240 have an elliptical shape, while holes 250 are arranged in a trapezoidal shape, although these may be collectively referred to as "perforations".

[0044] The continuous wall formed within section 200 includes horizontal members 260, inclined members 270, and vertical members 280. Generally, vertical member 280 will comprise a straight line of continuous solid material aligned along lines 282-282. The positioning of members 260, 270, and 280 also serves to define perforations 240 and 250.

[0045] Channel 210 in Figure 4 The best illustration is found here. The thick-walled sections 202 found in components 260, 270, and 280 contrast with the thin-walled sections 204. As shown, these thin sections 204 are aligned with the holes 240, although they can also form channels 210 aligned with the holes 250.

[0046] Figure 4 The diagram also depicts how groups of holes 240 and groups of holes 250 alternate along the surface of segment 200. In this arrangement, each group is provided on a corresponding arcuate segment 242, 252 of wall 200. Preferably, an equal number of groups of holes 240 and groups of holes 250 are provided, although the arrangement may provide combinations in which one more or one less group of holes 240 is provided relative to the number of groups of holes 250. It is noteworthy that each arcuate segment 242, 252 is discrete and substantially non-overlapping in order to support and define members 260, 270, 280. However, in some embodiments, these groups may be provided along a slightly spiraling path passing through axis CC.

[0047] It is worth noting that the biasing member 100 includes a bore 311, the inner diameter of which will mate with the pump rod described below. The inner diameter cut along line 326-326 at the bottom of member 100 will be larger than the inner diameter of bore 311. In some respects, the inner diameter along 326-326 will also be larger than the outer diameter of flange 310 itself.

[0048] Figure 8A and 8BAn alternative arrangement of the biasing member is shown. Here, the outer helical trace 220 and the inner helical trace 230 remain on the biasing member 100A. However, the thinned channel is not required. Instead, the hole 250A extends the length of the wall section 200. Furthermore, several holes 240A, 240B, and 240C of different shapes are provided. These holes can have different shapes and sizes. Figure 8A and 8B The three holes shown are merely exemplary and not limiting. Furthermore, the holes and openings may have all the same features as described above with respect to the bias member 100.

[0049] It is worth noting that the offset member 100A retains the inclined member 270 and the vertical member 280, as described above. However, flanges 310 and 320 can provide vertical support to define the bore 250A. Furthermore, the holes 240A, 240B, and 240C are aligned along a common axis or spiral track within the wall section 200; however, their different dimensions mean they may not be as... Figures 1 to 5B The biasing members 100 are arranged uniformly as shown.

[0050] Other common features between biasing members 100 and 100A include the interruption (through a perforation) along the outer helical trace 220 and the relative diameter / radius characteristics of traces 220 and 230. Although in Figure 8A and 8B As not shown, the biasing member 100A may also include interface structures (e.g., ribs, radial walls, notches, etc.) on flanges 310, 320. Generally, this alternative arrangement provides essentially the same benefits as described above, except that the relative diameter and axial height of the biasing member 100A are less pronounced (or significant) than those of the biasing member 100 (in many distribution pump designs, the biasing member 100 is considered a direct replacement for a metal coil spring).

[0051] Further reference Figures 9A to 10Another aspect of a series of all-polymer biasing components 100B is envisioned. These configurations (including, but not limited to, stacks X, Y, Z) are particularly suitable for use in standardized distributor pump drives, as described below. However, the biasing component itself is configured as multiple modular units M, which are stacked on top of each other in a specific pattern to allow for adjustment of the spring force of the biasing component and the distribution pump, and the resulting distribution capacity. Specifically, the orientation of the modular units M is adapted to adjust the height and compression stroke of the entire biasing component X, Y, Z. These adjustments affect the spring force transmitted by the entire stack, thereby enabling the individual units M to be mass-produced while still remaining flexible to adjust the stack to meet the specific performance requirements of the fluid / distribution pump (as described below). Notably, the variation in axial height is small enough to allow any of the stacks X, Y, Z (or other stacks envisioned herein) to be introduced into the distribution pump below without further changes to the pump design or the modular units themselves.

[0052] Modular unit M has a truncated conical shape and a helix, as described above for offset members 100, 100A. To form modular offset member 100B, multiple units M are stacked and connected to each other by means of connection features provided on flanges 310 and 320.

[0053] Each modular unit M in the stack is adjacent to other modular units in a nested relationship (stack Z), an adjacency relationship (stack X), or a hybrid relationship (stack Y). In a nested relationship, the narrow ends of unit M are aligned along the same direction, while in an adjacency relationship, such nesting is not allowed. A hybrid relationship considers a combination of at least one set of adjacent units and one set of nested units.

[0054] In modular unit M, flange 320 (at the wider end) includes an axially extending wall 322 having an inner diameter larger than the outer diameter of flange 310 (at the narrower end). Notches or other features 324 (e.g., beads and grooves, slots / bayonet, snap-on tabs, etc.) may be configured to mate with corresponding beads or protrusions on flange 310 such that when all modular units M are nested within each other (as described below), these connecting features secure the units together and prevent unwanted rotation or separation. Alternatively, features 324 are provided on the top surface of flange 320 so as to be received by the horizontal surface of flange 310 (e.g., on outer wall 316, within repeating shape 318, etc.).

[0055] Wall 322 may include bosses or stop structures to prevent adjacent / nested units from advancing too far into the stack. It is worth noting that because the modular units are identical, the inner diameter of the defining hole 311 remains constant to allow the bias member 100B to be incorporated into the pump design, just like members 100 and 100A.

[0056] In the adjacency relationship, the interface is formed between flanges 310 or 320. Therefore, any of the additional features 324 and / or features 312, 314, 316 can be designed to have a connection arrangement with interfaces along the horizontal plane / adjacent.

[0057] The final results of these different locations are Figure 9A and 9B This is best illustrated in the diagram. Typically, each modular unit has a nominal height H. Adjacent stacks will have an axial height S1 (stack height equal to n × H, where n is the number of units in the stack), while nested stacks will have a smaller axial height S2 (stack height less than n × H). This difference corresponds to a shorter stroke length in nested stacks, meaning nested stacks will generate less spring force and less attraction. Mixed stacks (where n > 3) will generate relatively greater force and attraction, while perfectly adjacent stacks will generate the greatest force and attraction.

[0058] These differences in spring force and suction capacity (which can also translate to larger volumetric dosages) allow dispenser pump manufacturers to fine-tune and improve pump performance without manufacturing additional / different parts. Instead, manufacturers simply need to change the orientation of the modular unit M, or additionally / alternatively, add or remove units as needed / desired.

[0059] Figure 10 This demonstrates how the modular concept can be expanded by increasing the number of units M within the stacks X, Y, and Z. As the number of units M increases, the axial travel lengths XI, Yl, and Z1 (relative to the common baseline B) can be customized more specifically. Further units can be added to further increase the range of spring forces, suction forces, etc.

[0060] Therefore, in addition to the unique structure formed by the biasing member 100B, another aspect of the invention relates to a method of manufacturing a distributor pump. Specifically, the actuator head with a rod and the pump motor are provided separately. A plurality of modular spring units are positioned between the actuator head and the pump motor. The orientation of each modular spring unit is then adjusted to increase or decrease the spring force and pumping characteristics of the distributor pump. In some aspects, one or more modular spring units may be added or removed. All modular spring units are substantially identical and have the physical characteristics described herein.

[0061] As described above, the connection features can be reversed, such that the axial wall becomes part of flange 310 and flange 320 presents a horizontal surface. Alternatively, the stacking of modular units M can be designed solely based on nesting relationships, without requiring additional connection features.

[0062] It is worth noting (and as Figures 9A to 10As shown), modular units do not necessarily require the aforementioned perforations. While the size and shape of the holes provide designers with the freedom to develop all-polymer springs with sufficient flexibility and spring force, a modular approach can complement or replace perforations. A key feature incorporated herein by reference to any polymer spring according to the invention is the formation of internal and external helical traces in a truncated conical shape, as well as upper and lower flanges, including mating engagement features, to enable easy and reliable assembly of the stack of units M.

[0063] Finally, this modular approach allows pump designers to consider all polymer pump designs, where the number of modular units M (more specifically, the cumulative height of all these units) allows the bias member 100B to replace the metal coil spring in virtually any reciprocating pump design. Furthermore, the need for greater or lesser spring forces allows designers to select and fine-tune the number of perforations in members 100, 100A to allow for a wider range of designs. Perforated and non-perforated bias members can also be mixed and matched, provided they have the same coverage area / size.

[0064] Given the above, the reciprocating pump dispenser can be made entirely of recyclable materials (such as polymers) without requiring metal components. The pump body is coupled to a container, while an all-polymer biasing member positioned between the body and the actuator generates sufficient suction (during actuation) to dispense fluid from the container. The biasing member is shaped like a hollow cylinder with two offset and congruent helical boundaries defining the member's profile. A portion of this profile is defined by solid surfaces of varying thicknesses, forming regular, discontinuous elliptical orifices along the axes. In some embodiments, these axes define a truncated conical shape.

[0065] As described above, the biasing member has an outer spiral trajectory and an inner spiral trajectory that rotate more than 360°, more preferably more than 540° or 720° (i.e., one full turn, one and a half turns or two full turns) around the surface of the cylinder / cone.

[0066] A biasing member (as a single unit or a stack of modular units) is positioned between the actuator head and the pump body. The actuator head includes a dispensing nozzle, which is typically perpendicular to the axis of reciprocating motion of the pump motor. The nozzle connects to a dispensing tube or rod that extends coaxially into the pump body itself. The actuator also includes a mating attachment along its bottom surface that engages the top surface of the biasing member.

[0067] The pump body includes a cap, an insert, and a body column rotatably attached to a container. The insert and / or the body column may be attached to the cap such that the entire pump body remains stationary relative to the reciprocating movement of the actuator head (caused by the biasing member). The insert may include a mating attachment on its top inner surface to receive the bottom end of the biasing member. The insert is also partially and coaxially received within the body column.

[0068] Conversely, the main body column defines the pump chamber. A movable piston forms a sliding seal with the internal walls of the hollow main body column. Separately, a plug element is attached to the rod, and this plug element also moves within the pump chamber in response to the reciprocating motion of the actuator head and the rod, thereby changing the volume of the pump chamber. Because the plug element moves in unison with the rod, and the piston creates sufficient space during its downward stroke to temporarily open the orifice in the plug element to allow fluid to pass through, the plug element acts as an outlet valve for the pump chamber.

[0069] It is worth noting that the pump motor is designed to include a locked position. Therefore, when the pump is fully extended, the sealing interface is engaged, including a radial force applied by the plug element against the piston to seal the piston to the inner wall of the body column. A chamfer and / or a set of bevels on the top surface of the insert or cap engages a structure on the actuator head to ensure the actuator remains locked in the upward position. Other arrangements for locking are also possible.

[0070] The locked position ensures that the bias member is not subjected to unnecessary stress associated with prolonged retention in the compressed position. It is believed that prolonged compressive stress can degrade the performance of the all-plastic bias member described herein.

[0071] The remaining features of the pump relate to its basic function. For example, the suction pipe ensures that fluid can be drawn from the internal volume of the container. An inlet valve (such as a ball valve) controls the flow rate of fluid into the pump chamber. The container is configured to be typically threaded to the pump body, such that the pump engages a corresponding set of features at or near the container opening. The container itself must retain the fluid to be dispensed and have sufficient rigidity and / or venting capacity to withstand the pumping motion and the accompanying pressure differentials generated by the structure disclosed herein.

[0072] While a conventional fluid distribution pump is depicted, the biasing member envisioned herein is also suitable for use in foam pumps and other dispensers. As an example, the shortened biasing member 100A has appropriate dimensions for use in trigger-type sprayers. This will also allow a greater number of modular units M to be incorporated into the biasing member 100B, thereby providing a wider range of possible spring forces (i.e., the maximum value of B-Y1 and the minimum value of B-Z1, as shown) within a fixed axial height range. Figure 10 (As shown).

[0073] All components of the pump dispenser should be made of materials with sufficient flexibility, structural integrity, and chemical inertness. Certain grades of polypropylene and polyethylene are particularly advantageous, especially considering the absence of any thermosetting resins and / or blends of different elastic polymers. Materials should also be selected based on processability, cost, and weight. Common polymers suitable for injection molding, extrusion, or other common molding processes should have special properties.

[0074] refer to Figures 6A-7B The dispensing pump 500 includes an actuator 600 and a pump body 700. A sealing cap 800 is fixed to the cap 700, thereby holding these components securely to a container (not shown) connected to the pump 500. It should be noted that... Figure 7A and Figure 7B It is particularly suitable for single bias members or stacks of bias members, as envisioned and described herein.

[0075] Actuator 600 includes a head 610 with an outlet nozzle 630 for dispensing fluid. The fluid is delivered from a container and pump body 700 via a hollow tubular rod 620. A skirt 612 extends downward from the head 610, and engaging features 622 are disposed in the skirt 612 and / or in the outer surface of the upper portion of the rod 620. Feature 622 is coupled to flange 310 such that biasing member 100 (or 100A or 100B) pushes actuator 600 into an extended position (i.e., away from the stationary body 700 and closure 800).

[0076] The pump body 700 includes a column 730 defining a pump chamber 732. The volume of the chamber 732 is changed by an actuation applied to the head 610 (i.e., a downward axial force), and the biasing member 100 provides sufficient force to return the actuator 600 to its extended position. In doing so, the valve 740 is temporarily displaced, and fluid is drawn into the chamber 732. Upon subsequent actuation, the fluid already in the chamber 732 is forced through the valve 742, upward through the central clearance of the rod 620, and out of the nozzle 630. The valves 740 and 742 can be temporarily displaceable ball valves, disc valves, diaphragms, or other known structures.

[0077] The bottom flange 320 of the biasing member 100 is located on a radial boss 752 formed on the chaplet connector 750. The connector 750 secures the body 700 to the closure 800. The connector 750 (or the interface between the body 700 and the closure 800) is configured to allow free passage of vents and / or make-up air to avoid pressure differentials between the sealed container and the surrounding environment.

[0078] The boss 752 also serves as an upper stop for the piston element 720. The piston 720 slides axially within the cylinder 730 to change the volume of the chamber 732 (this requires the piston 720 to sealably engage the inner surface of the cylinder 730). The lower edge of the rod 620 is coupled to or abuts the piston 720 such that both move downwards upon actuation, while the elasticity of the biasing member 100 ensures that the actuator 600 returns to the extended position, thereby pulling the piston 720 upwards along with it. In this way (and as described above), fluid is drawn through the suction tube 710 and ultimately dispensed from the nozzle 630.

[0079] The closure cap 800 may include seals for venting and fluid containment, as well as connection features (e.g., threads) for attachment to the neck of the container. It is noteworthy that arrangements where the biasing member is expected to have a specific utility are those where the pump 500 is designed to be coupled to a conventional narrow-neck container. In such containers, the diameter of the neck (and the maximum permissible diameter of the biasing member 100) is smaller than the expected axial travel length of the actuator 600. In other words, this means that the biasing member 100 must be axially compressible and remain elastic along a length exceeding the maximum outer diameter of the member 100 itself. In some arrangements, the axial travel may be one, two, or three times larger than this diameter.

[0080] References to connections in this disclosure should be understood to include any conventional means used in the field. While threaded connections, beaded and grooved connections, and slotted and bossed assemblies can be used, snap-fit ​​or forced-fit assemblies of components can also be employed. Adhesives and fasteners can also be used, but these components must be carefully selected to maintain the recyclability of the components.

[0081] Similarly, a union can include a connection or an adjacency relationship. These terms, as well as any implicit or explicit references to unions, should be considered in the context of their use, and any perceived ambiguity can be resolved by referring to the accompanying drawings.

[0082] Various aspects and embodiments for biasing components and pumps include any combination of one or more of the following features:

[0083] • Actuators with levers;

[0084] • The pump body is configured as a receiving rod;

[0085] • A biasing member positioned between the actuator and the pump body to push the actuator away from the pump body, the biasing member comprising multiple modular units arranged in a stacked manner and each modular unit having a central hole sized to receive a coaxial rod.

[0086] • Each modular unit includes an upper radial flange, a lower radial flange, a wall section, a central hole, and an outer helical track that is radially offset from the inner helical track. Both the outer and inner helical tracks spiral around the central axis of the offset member from the bottom edge to the top edge, so that the wall section has a corrugated surface.

[0087] • In this configuration, the upper radial flange of each modular unit is configured to be received in the lower radial flange of an adjacent unit in the stack or to be adjacent to the upper radial flange of an adjacent unit in the stack.

[0088] • Wherein, if measured in the horizontal plane of the bias member, the minimum radius of the outer spiral trace is greater than the maximum radius of the inner spiral trace in any horizontal plane of the bias member.

[0089] • The outer spiral trajectory is kept offset from the inner spiral trajectory by a substantially constant axial distance;

[0090] • In this case, multiple perforations regularly interrupt one or both of the outer and inner spiral traces;

[0091] The connection structure is formed on the horizontal surface of the upper radial flange and / or lower radial flange of each modular unit;

[0092] • The connecting structure includes at least one of radially aligned ribs, an inner circular wall, and an outer circular wall; • The connecting structure is formed on the vertical surface of a wall extending axially from the upper radial flange and / or lower radial flange of each modular unit.

[0093] • The connecting structure includes at least one of an axially extending sidewall, a connecting structure formed in the outer surface of the axially extending wall, and a connecting structure formed in the inner surface of the axially extending wall.

[0094] • In this modular unit, a mating connection structure is provided on the upper flange and the lower flange, and the mating connection structure is configured such that the lower flange from the first unit is nested in or adjacent to the upper flange of the second unit.

[0095] • In this case, two or three modular units are set in the stack;

[0096] • All modular units are arranged in a nested or adjacency relationship; and

[0097] • In this process, three modular units are set up in a hybrid relationship within the stack.

[0098] Various embodiments of a method relating to the spring force of adjusting the dosage of the all-polymer bias member of an all-polymer dispenser pump are also envisioned, comprising any combination of one or more of the following:

[0099] • Provides multiple modular spring units, each spring unit having a center hole, an upper radial flange, a lower radial flange, a center hole, and an outer helical track radially offset from the inner helical track. Both the outer and inner helical tracks spiral around the central axis of the biasing member from the bottom edge to the top edge, so as to give the wall section a corrugated surface.

[0100] • Connect modular spring units to form biasing units with specific and different spring forces, depending on whether the modular spring units are arranged in a nested, adjacent, or mixed manner; and

[0101] • Position the bias unit around the rod of the actuator head between the rod of the pump body and the rod of the actuator head so as to push the actuator head away from the pump body with the desired spring force.

[0102] Although this embodiment has been shown in the accompanying drawings and described in the foregoing detailed description, it should be understood that the invention is not limited to the disclosed embodiments, and various rearrangements, modifications, and substitutions are contemplated. Exemplary embodiments have been described with reference to preferred embodiments, but further modifications and variations also include those described in the foregoing detailed description. These modifications and variations also fall within the scope of the appended claims or their equivalents.

Claims

1. A fully polymer reciprocating distributor pump, comprising: An actuator with a lever; A pump body configured to receive the rod; as well as A biasing member located between the actuator and the pump body to push the actuator away from the pump body, the biasing member comprising a plurality of modular units arranged in a stacked manner and each modular unit having a central hole sized to coaxially receive the rod; Each modular unit includes an upper radial flange, a lower radial flange, a wall section, a center hole, and an outer helical track that is radially offset from the inner helical track. Both the outer and inner helical tracks spiral around the central axis of the offset member from the bottom edge to the top edge, so that the wall section has a corrugated surface. The upper radial flange of each modular unit is configured to be received in the lower radial flange of an adjacent unit in the stack or to be adjacent to the upper radial flange of an adjacent unit in the stack; and The wall section is provided with multiple perforations that interrupt the outer and inner spiral tracks. The total surface area of ​​the perforation closest to the upper radial flange is the smallest, while the total surface area of ​​the perforation closest to the lower radial flange is the largest.

2. The distributor pump according to claim 1, wherein, If measured in the horizontal plane of the biasing member, the minimum radius of the outer spiral trace is greater than the maximum radius of the inner spiral trace in any horizontal plane of the biasing member.

3. The distributor pump according to claim 1, wherein, The outer spiral trajectory is kept offset from the inner spiral trajectory by a substantially constant axial distance.

4. The distributor pump according to claim 1, wherein, The plurality of perforations regularly interrupt one or both of the outer spiral trace and the inner spiral trace.

5. The distributor pump according to any one of claims 1, 2, 3 or 4, wherein, The connection structure is formed on the horizontal surface of the upper radial flange and / or lower radial flange of each modular unit.

6. The distributor pump according to claim 5, wherein, The connecting structure includes at least one of radially aligned ribs, an inner circular wall, and an outer circular wall.

7. The distributor pump according to any one of claims 1, 2, 3 or 4, wherein, The connection structure is formed on the vertical surface of the wall extending axially from the upper radial flange and / or lower radial flange of each modular unit.

8. The distributor pump according to claim 7, wherein, The connection structure includes at least one of an axially extending sidewall, a connection structure formed on the outer surface of the axially extending wall, and a connection structure formed on the inner surface of the axially extending wall.

9. The distributor pump according to any one of claims 1, 2, 3 or 4, wherein, Each modular unit has a mating connection structure on its upper and lower flanges, the mating connection structure being configured such that the lower flange from the first unit is nested in or adjacent to the upper flange of the second unit.

10. The distributor pump according to claim 9, wherein, Two or three modular units are arranged in the stack.

11. The distributor pump according to claim 10, wherein, All modular units are set to nested or adjacency relationships.

12. The distributor pump according to claim 9, wherein, Three modular units are arranged in a hybrid relationship in the stack.

13. A method for adjusting the spring force of the all-polymer biasing member of an all-polymer dispenser pump to adjust the dosage, the method comprising: Multiple modular spring units are provided, each spring unit having a wall section, an upper radial flange, a lower radial flange, a center bore, and an outer helical track radially offset from an inner helical track. Both the outer and inner helical tracks spiral around the central axis of the biasing member from the bottom edge to the top edge, so that the wall section has a corrugated surface. The wall section is provided with multiple perforations that interrupt the outer and inner helical tracks, with the total surface area of ​​the perforations closest to the upper radial flange being the smallest and the total surface area of ​​the perforations closest to the lower radial flange being the largest. as well as The modular spring units are connected to form biasing units with specific and different spring forces, depending on whether the modular spring units are arranged in a nested, adjacent, or mixed relationship.

14. The method of claim 13, further comprising positioning the biasing unit around a rod of the actuator head between the pump body and the rod of the actuator head to push the actuator head away from the pump body with a desired spring force.

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