Refillable dispenser for stick products

Abstract

A refillable dispenser for stick products according to the present invention comprises a holder cup, an A-shaped shell and an inner base. Preferably, the dispenser further comprises an outer base and a closure. The holder cup and the A-shaped shell form a cartridge sub-assembly for stick products, which can be bottom filled and removed and replaced as needed. The dispenser does not require lubricants.

Description

Technical Field

[0001] This invention relates to dispensers for stick-shaped products such as lipsticks. More specifically, this invention relates to a refillable dispenser utilizing a replaceable cartridge for stick-shaped products. Background Technology

[0002] Prior art containers for rod-shaped products may include a cylinder with a rotatable member disposed at the bottom end of the cylinder. The rod-shaped product is received into a retainer cup, which is disposed within the cylinder. Rotation of the rotatable member relative to the cylinder causes a mechanism inside the cylinder to longitudinally advance the rod-shaped product away from the rotatable member, such that a portion of the rod-shaped product is exposed above the cylinder. In this way, the exposed portion of the product is available for application. One type of design uses a threaded follower mounted on a threaded shaft. US2020 / 0154852A1 and GB1281886A belong to this type. Neither of these discloses a refillable dispenser and a bottom-fillable replacement cartridge. Moreover, in use, surfaces sliding on each other, whether rotating or translating, experience a considerable degree of friction. For this reason, lubricant is typically applied to those surfaces moving on each other. Eliminating the need for lubricant would make manufacturing and assembly easier and less costly.

[0003] Purpose of the invention

[0004] The main objective of this invention is to provide a dispenser for rod-shaped products that utilizes reusable components and replaceable cartridges for rod-shaped products.

[0005] Another object of the present invention is to provide a replaceable feed cylinder for bottom filling of rod-shaped products.

[0006] Another object of the present invention is to provide a dispenser for rod-shaped products that does not use lubricant. Summary of the Invention

[0007] The refillable dispenser for rod-shaped products according to the invention includes a retainer cup, an A-shaped shell, and an inner base. The retainer cup and the A-shaped shell form a cartridge assembly for rod-shaped products, which can be removed and replaced as needed. The retainer cup and the A-shaped shell cannot move relative to each other before the cartridge is assembled to the inner base. After the cartridge is assembled to the inner base, the retainer cup can translate within the A-shaped shell but cannot rotate relative to the A-shaped shell. Preferably, the dispenser also includes an outer base and a closure. Attached Figure Description

[0008] Figure 1 An embodiment of a retainer cup for rod-shaped products is shown.

[0009] Figure 2 yes Figure 1 A cross-sectional view of the retainer cup.

[0010] Figure 3 yes Figure 1 A close-up of the lower step of the retainer cup.

[0011] Figure 4 yes Figure 1 A top view of the retainer cup.

[0012] Figure 5 An embodiment of the A-shaped shell is shown.

[0013] Figure 6 It is the barrel assembly (located in) Figure 5 Inside the A-shaped shell Figure 1 A cross-sectional view of the retainer cup.

[0014] Figure 7 yes Figure 5 A-shaped shell cross-sectional view

[0015] Figure 8 yes Figure 6 Bottom perspective view of the barrel assembly.

[0016] Figure 9 One embodiment of the internal base is shown.

[0017] Figure 10 yes Figure 9 A cross-sectional view of the internal base.

[0018] Figure 11 This is a front view of one embodiment of a refillable dispenser, where the internal base is not fully assembled.

[0019] Figure 12 yes Figure 11 A cross-sectional view of the distributor, showing the internal base fully assembled.

[0020] Figure 13 An embodiment of the external base is shown.

[0021] Figure 14 yes Figure 13 A cross-sectional view of the external base.

[0022] Figure 15 It is a cross-sectional view of one embodiment of a refillable dispenser having an assembled external base and closure.

[0023] Figure 16 This is a bottom perspective view of a second embodiment of the barrel assembly.

[0024] Figure 17 This is another implementation of a retainer cup for rod-shaped products.

[0025] Figure 18 yes Figure 17 A cross-sectional view of the retainer cup.

[0026] Figure 19 Another embodiment of the A-shaped shell is shown.

[0027] Figure 20 yes Figure 19 A cross-sectional view of the A-shaped shell.

[0028] Figure 21 It is the barrel assembly (located in) Figure 19 Inside the A-shaped shell Figure 17 Top plan view of the retainer cup.

[0029] Figure 22 The image shows a retainer cup and a rod-shaped product with a non-circular cross-section.

[0030] Figure 23 The A-shaped shell and the molded cap are shown.

[0031] Figure 24 A bottom-filled refillable dispenser is shown. Detailed Implementation

[0032] The term "including" means that the listed elements are not limited to those explicitly listed.

[0033] The refillable dispenser (10) for rod-shaped products (9) according to the invention includes a replaceable cartridge assembly (8). The cartridge assembly includes an A-shaped shell (2) and a retainer cup (1) fully inserted into the A-shaped shell such that the retainer cup and the A-shaped shell cannot rotate or translate freely relative to each other. The refillable dispenser also includes an inner base (3) that cooperates with the cartridge assembly to allow the retainer cup to translate vertically within the A-shaped shell, but not to rotate freely. Preferably, the dispenser also includes an outer base (4) and a closure (5).

[0034] Replaceable barrel assembly

[0035] Holder cup

[0036] See Figures 1 to 4 The retainer cup (1) is formed as a hollow stepped tube. The upper step (1a) includes a wall (1b). The lower step (1c) includes a wall (1d). The lower step is larger in its lateral dimension than the upper step, such that a shoulder (1e) exists at the transition from the lower step to the upper step of the retainer cup. The retainer cup has a proximal end (1f) corresponding to the free end of the lower step and a distal end (1g) corresponding to the free end of the upper step.

[0037] The interior of the distal end (1g) of the retainer cup (1) is shaped into a cup (1h). The cup is defined by a portion of the cylindrical wall (1b) of the upper step and a bottom (1i) extending radially inward from the inner surface of the cylindrical wall. Preferably, the bottom of the cup has an opening (1j) for product filling (see below). The cup is capable of supporting one end of the rod-shaped product (9) and retaining the rod-shaped product during normal intended use. To ensure retention, a number of vertical splines (1k) may be provided on the inner surface and bottom of the cup, as is commonly done in the art. Below the horizontal plane of the cup (1h), the inner surface of the cylindrical wall (1b) of the upper step (1a) of the retainer cup (1) is formed as a threaded shaft (1l) extending downward into the lower step (1c), but may not extend all the way to the proximal end (1f) of the retainer cup.

[0038] The wall (1d) of the lower step (1c) is provided with at least one notch (1m). Preferably, there are two notches positioned opposite each other. Positioned in at least one notch are radially outwardly projecting tabs (1n). Each tab is connected to the wall of the lower step by a flexible strut (1o), which allows the tab to move radially inward when pressure is applied to it, and then causes the tab to return to its original position when the pressure is removed. As will be shown, preferably, the edges (1p) of the tabs are rounded. Preferably, the radius of curvature of the rounded edges is equal to or greater than the thickness of the wall (2b) of the upper step (2a) of the A-shaped shell (2) (see below).

[0039] A-shaped shell

[0040] See Figures 5 to 8 The A-shaped shell (2) is also formed as a hollow stepped tube. The upper step (2a) of the A-shaped shell includes a wall (2b). The lower step (2c) of the A-shaped shell includes a wall (2d). The lower step is larger in its lateral dimension than the upper step, such that a shoulder (2e) exists at the transition from the lower step to the upper step of the A-shaped shell. The A-shaped shell has a proximal end (2f) corresponding to the free end of the lower step and a distal end (2g) corresponding to the free end of the upper step. The wall of the lower step is provided with at least one hole (2m). Preferably, there are two holes positioned opposite each other.

[0041] The dimensions of the A-shell (2) are set to allow the retainer cup (1) to be fully inserted into the A-shell (see...). Figure 6For example, the total length of the A-shaped shell from the proximal end (2f) to the distal end (2g) is greater than the total length of the retainer cup. Furthermore, the upper step (2a) of the A-shaped shell is large enough to accommodate the upper step (1a) of the retainer cup, and the lower step (2c) of the A-shaped shell is large enough to accommodate the lower step (1c) of the retainer cup. Therefore, when the distal end (1g) of the retainer cup is inserted through the proximal end (2f) of the A-shaped shell, the upper step (1a) of the retainer cup fits into the upper step (2a) of the A-shaped shell, and the lower step (1c) of the retainer cup fits into the lower step (2c) of the A-shaped shell. However, in the resting position of the tab (1n) of the retainer cup (1), the tab will prevent the retainer cup from being fully inserted into the A-shaped shell (2). Therefore, in order to fully assemble the retainer cup into the A-shaped shell, the tab must be radially inwardly displaced. As described above, preferably, the edge (1p) of the tab is rounded, with a radius of curvature equal to or greater than the thickness of the lower cylindrical wall (2d) of the lower step (2c) of the A-shaped shell. This makes it easier for the tab (1n) to enter the proximal end (2f) of the A-shaped shell. When the retainer cup is fully assembled into the A-shaped shell, the tab of the retainer cup aligns with the hole (2m) of the A-shaped shell. This allows the tab to return to its rest position and protrude through the hole of the A-shaped shell. The sub-assemblies of the A-shaped shell and the retainer cup form a replaceable barrel (8). The proximal and distal ends of the barrel coincide with the proximal end (2f) and distal end (2g) of the A-shaped shell. Furthermore, in Figure 6 and Figure 8 In the arrangement shown, the retainer cup (1) and the A-shell (2) are locked so that they cannot move relative to each other (except for some negligible amount); neither rotation nor translation. However, in use, in order for the rod-shaped product (9) to extend, it will be necessary to allow the retainer cup to translate relative to the A-shell, but still not rotate. As we will see, translation will be achieved by pressing down the tab (1n) of the retainer cup, therefore, a device must be provided to prevent rotation between the retainer cup and the A-shell. The phrase “prevent rotation” means that only negligible rotation may occur due to a small amount of clearance in the components.

[0042] Anti-rotation device - first embodiment

[0043] An example of preventing rotation between the retainer cup (1) and the A-shaped shell (2) requires that the lower step (1c) of the retainer cup and the lower step (2c) of the A-shaped shell have different cross-sectional shapes, such that the lower step of the retainer cup can be fitted into the lower step of the A-shaped shell in at least one relative orientation and cannot be fitted into the lower step of the A-shaped shell in at least one other relative orientation. For example, the lower step of the retainer cup may have a non-circular cross-section, such as an ellipse with a major axis (M) and a minor axis (m). Figures 1 to 4As shown), and the two tabs (1n) are located at either vertex of the elliptical wall along the major axis (M). Meanwhile, the lower step (2c) of the A-shaped shell allows the lower step of the retainer cup to be fitted therein, but only if the tabs of the retainer cup are aligned with the holes in the A-shaped shell. For example, if the lower step of the A-shaped shell is cylindrical, the inner surface of the lower step of the A-shaped shell may have at least one, preferably at least two, longitudinal splines (2q), which effectively reduce the internal dimensions of the lower step of the A-shaped shell to be smaller than the major axis (M) of the lower step of the retainer cup. This can be achieved... Figure 8 This is best observed in the center. In this arrangement, the elliptical lower step of the retainer cup cannot rotate within the lower step of the A-shaped shell. Furthermore, during translation relative to the A-shaped shell, the longitudinal spline stabilizes the retainer cup.

[0044] Anti-rotation device - second embodiment

[0045] Figures 16 to 21 A second embodiment of the retainer cup (1') and A-shaped shell (2') is shown. This embodiment illustrates another means to prevent rotation between the retainer cup and the A-shaped shell. The upper step (1a') of the retainer cup (1') includes a wall (1b') with a non-circular cross-section. Similarly, the upper step (2a') of the A-shaped shell (2') includes a wall (2b') with the same cross-section, only slightly larger, so that the upper step of the retainer cup can be fitted therein. In this embodiment, even though the lower steps (1c', 2c') of the retainer cup and the A-shaped shell include concentric cylindrical walls (1d', 2d'), the non-circular cross-sectional shape of the upper steps of the retainer cup and the A-shaped shell will prevent relative rotation between these components. Generally, there is considerable freedom in choosing the cross-sectional shapes of the retainer cup (1') and the A-shaped shell (2'), which determines the shape of the rod-shaped product (9) and allows for virtually unlimited design choices in terms of the shape of the rod-shaped product (9).

[0046] Anti-rotation device - third embodiment

[0047] In some implementations, other means may be provided to ensure that the retainer cup (1') and the A-shaped shell (2') cannot rotate relative to each other. For example, such as Figure 16 , Figure 17 and Figure 20 As shown, the outer surface of the cylindrical wall (1d') of the lower step (1c') of the retainer cup may be provided with one or more longitudinal grooves (1q'), which are designed to accommodate an equal number of longitudinal flanges (2q') on the inner surface of the cylindrical wall (2d') of the lower step (2c') of the A-shaped shell. The retainer cup will be able to translate vertically within the grooves, but will not rotate relative to the A-shaped shell.

[0048] Internal base

[0049] See Figures 9 to 12 The inner base (3) is shaped as a cylindrical wall (3b) that closes at its proximal end (3f). A threaded helix (3l) is generated from the inner surface of the closed end. The threaded helix rises above the cylindrical wall of the inner base and is designed to mate with the threaded shaft (1l) of the retainer cup (1). To assemble the barrel (8) onto the inner base, the threaded helix (3l) of the inner base is inserted into the proximal end (1f) of the retainer cup and then screwed into the threaded shaft (1l) of the retainer cup. This can be achieved by twisting the inner base while keeping the A-shaped shell (2) stable, or vice versa. The threaded helix is ​​shorter than the threaded shaft. Preferably, when fully assembled, the distal end (3g) of the threaded helix (3l) is at least one full threaded turn below the bottom (1i) of the retainer cup (1) (see Figure 12 More preferably, when fully assembled, the distal end of the threaded helix is ​​at least two full threaded turns below the bottom of the retainer cup. As described below, any additional space within the threaded shaft (1l) can be filled with the product.

[0050] The inner diameter of the inner base (3) is set to accommodate the proximal end (2f) of the A-shaped shell (2). When the barrel (8) is screwed onto the inner base (3), the protrusion (1n) of the retainer cup (1) protruding through the hole (2m) of the A-shaped shell (2) will impact the cylindrical wall (3b) of the inner base. However, the rounded edge (1p) of the protrusion will cause the protrusion to deflect inward, thus allowing the cylindrical wall of the inner base to pass over the protrusion. Screw the inner base into the barrel until the A-shaped shell touches the bottom at the closed end of the inner base. When fully assembled, the protrusion (1n) of the retainer cup (1) is located inside the inner base (3) and is biased inward by the cylindrical wall (3b) of the inner base. Through this construction (as Figure 12 As shown), the retainer cup can move up and down within the A-shaped shell (2), but does not rotate. The translation of the retainer cup (1) is achieved by the relative rotation of the A-shaped shell (2) and the inner base (3).

[0051] During the raising and lowering of the retainer cup, the A-shaped shell touches the bottom at the closed proximal end (3f) of the inner base. To reduce friction between the A-shaped shell and the inner base, an annular ridge (3r) is preferably provided on the closed end of the inner base. The A-shaped shell will slide on the annular ridge. Due to the limited contact, friction between the A-shaped shell and the inner base will be significantly reduced. This eliminates the need for any lubricant between the A-shaped shell and the inner base. Optionally, an outer base (4, see below) may be included. If so, the outer surface of the cylindrical wall (3b) of the inner base is provided with a plurality of longitudinal grooves (3s) that mate with the outer base.

[0052] External base

[0053] Optionally, an external base (4) may be included. The external base streamlines the appearance of the dispenser (10) and provides a surface for attaching the closure (5). See also Figures 13 to 15 Typically, the outer base is formed as another hollow stepped tube, comprising an upper step (4a) and a lower step (4c), with a shoulder (4e) located between the upper and lower steps. The upper step of the outer base comprises an upper cylindrical wall (4b) having an outer diameter. The lower step of the outer base comprises a lower cylindrical wall (4d) having an outer diameter. The lower step of the outer base is higher than the lower step (2c) of the A-shaped shell (2). The outer base opens at its proximal end (4f) and distal end (4g). The proximal end is designed to slide on the distal end (2g) of the A-shaped shell and slide downward until the outer base covers the lower step (2c) of the A-shaped shell and the inner base (3). The length of the upper step (4a) of the outer base is less than the length of the upper step (2) of the A-shaped shell, such that the distal end of the A-shaped shell protrudes beyond the distal end of the outer base. This is necessary for the operation of the dispenser, as the A-shaped shell and outer base must be gripped by the user.

[0054] When fully assembled, the inner surface of the shoulder (4e) of the outer base (4) is in contact with the shoulder (2e) of the A-shaped shell (2). During the raising and lowering of the retainer cup (1), the relative rotation between these surfaces will cause undesirable friction. To reduce friction between the A-shaped shell and the outer base, one or more arcuate ridges (4r) are preferably provided on the inner surface of the shoulder of the outer base. This will significantly reduce contact and thus reduce friction between the A-shaped shell and the outer base. This eliminates the need for any lubricant between the A-shaped shell and the outer base.

[0055] The inner surface of the cylindrical wall (4b) of the lower step (4c) of the outer base (4) includes a plurality of longitudinal protrusions (4s). These protrusions are designed to engage with a plurality of longitudinal grooves (3s) on the outer surface of the cylindrical wall (3b) of the inner base (3). For example, when the outer base slides onto the inner base, the longitudinal protrusions of the outer base rest in the longitudinal grooves of the inner base. Once the inner and outer bases are engaged in this manner, the rotation of the inner base is achieved by rotating the outer base relative to the A-shaped shell. Moreover, the engagement between the inner and outer bases should be tight enough to generate friction that will hold the components together during normal operation of the dispenser. This engagement can be achieved by providing sufficient interference between the outer and inner bases near the proximal end (4f) of the outer base. However, this engagement should not be so tight that the user cannot separate the outer base from the inner base, which is necessary for replacing the barrel (8). Optionally, a circular retaining ring (4t) may be provided at the proximal end of the outer base to prevent the inner base and the barrel from accidentally retracting from the outer base.

[0056] Closure

[0057] See Figure 15 When the rod-shaped product (9) is not in use, the distal end of the dispenser (10) shall be fitted with a closure (5). The closure includes a sidewall (5b) that opens at its proximal end (5f) and closes at its distal end (5g). If provided, the closure is fitted onto the upper step (2a) of the A-shaped housing (2) and onto the upper step (4a) of the outer base (4). The sidewall (5b) of the closure is capable of engaging with the cylindrical wall (2b) of the upper step (2a) of the A-shaped housing and / or with the cylindrical wall (4b) of the upper step (4a) of the outer base. The closure may be held in place by any suitable means, including friction, snap-fit ​​fittings, latching, and threaded engagement. For example, the closure may form an interference fit only on the upper step (2a) of the A-shaped housing (2). Alternatively, the inner surface of the sidewall (5b) of the closure may be provided with an annular groove (5u), in which the retaining tip (4u) of the outer base rests when the closure is fully seated on the outer base. Alternatively, the closure and the outer base may be provided with mating threads. Ideally, the closure and the outer base will be able to form an airtight seal.

[0058] In a preferred embodiment, the refillable dispenser (10) includes both an outer base (4) and a closure (5) attached to the outer base. When the closure is positioned on the outer base, the A-shaped shell (2) is inaccessible, and unintentional elevation of the retainer cup (1) is impossible.

[0059] rod-shaped products

[0060] The cup-shaped part (1h) of the retainer cup (1) can support the rod-shaped product (9; see Figure 22 The refillable dispenser (10) according to the invention is applicable to all types of stick products (9) that are applied by dragging the product across a surface. These stick products include lipsticks, lip balms, deodorant sticks, antiperspirant sticks, gel sticks, etc. For the purposes of this invention, a stick product is a solid or semi-solid product that is an elongated block that can support its own weight without breaking when the elongated block is suspended at one end.

[0061] Method of filling the cylinder

[0062] The replaceable cartridge assembly (8) according to the invention can be bottom-filled or top-filled. Preferably, the cartridge is bottom-filled. See also Figure 24 Bottom filling should be performed with the retainer cup (1) fully retracted within the A-shaped shell (2). The molded cap (20) is placed on the distal end (2g) of the A-shaped shell (2). Preferably, the molded cap has a shape complementary to the distal end of the A-shaped shell (see...). Figure 23 With the barrel in the inverted position, the product filling nozzle (21) is inserted through the proximal end (1f) of the retainer cup. Softened product (9') flows into the barrel. The volume in the barrel between the molded cap and the cup-shaped part of the retainer cup is filled with product. Preferably, product filling continues until some product has reached the threaded shaft (1l) of the retainer cup, but such that the threaded helix (3l) of the inner base (3) does not extend into the product. Preferably, at least one threaded ring of the threaded shaft is filled with product. More preferably, at least two threaded rings of the threaded shaft are filled with product. This will give the final rod-shaped product excellent retention force. Once the filled product has cooled, the barrel can be flipped up to face up. The molded cap (20) can be removed from the A-shell or can be retained to protect the rod-shaped product during dispensing. The filled barrel (8) is ready to be assembled into the inner base (3) and the outer base (4) and closed with the closure (5). Bottom filling of the barrel is preferred when the rod-shaped product is relatively soft and can benefit from the support provided by the cylindrical wall (2b) of the A-shaped shell.

[0063] Alternatively, the replaceable barrel (8) according to the invention can be top-filled. With the retainer cup (1) in the fully raised position, the previously prepared rod-shaped product (9) can be inserted into the retainer cup up to the bottom (1i) of the retainer cup. When the retainer cup retracts into the A-shell (2), the sides of the rod-shaped product do not contact the wall of the A-shell. When the retainer is fully retracted, the molded cap (20) can be placed on the distal end of the A-shell to protect the rod-shaped product during dispensing. The filled barrel (8) is ready to be assembled into the inner base (3) and the outer base (4) and closed with the closure (5). This top-filling method is practical for relatively rigid rod-shaped products (9) that do not require the support of the A-shell (2).

[0064] Distributor operation

[0065] To operate the refillable dispenser (10), the closure (5) is removed from the A-shell (2) and the outer base (4). If there is a molded cap (20) on the distal end (2g) of the A-shell, it is also removed. In the fully retracted configuration of the refillable dispenser, the tab (1n) of the retainer cup (1) is located in the hole (2m) of the A-shell; however, translation between the retainer cup and the A-shell is possible due to the rounded edge (1p) of the tab. This is because the radius of curvature of the rounded edge is equal to or greater than the thickness of the lower cylindrical wall (2d) of the A-shell. Therefore, when opposing torsional forces are applied to the A-shell and the inner base (or optionally the outer base), rotation of the retainer cup is prevented by means provided for the corresponding purpose (e.g., the elliptical wall (1d) of the lower step (1c) of the retainer cup (1) impacts the longitudinal spline (2q) of the A-shell). Therefore, the retainer cup will be pushed upward within the A-shell. When the tab (1n) strikes the top of the hole (2m), the tab will shift radially inward, thereby forcing the tab out of the hole of the A-shell. With additional torsion between the A-shell and the outer base, the retainer cup will continue to rise freely within the A-shell until the shoulder (1e) of the retainer cup strikes the shoulder (2e) of the A-shell. At this point, the retainer cup is fully extended. When the torsional force reverses, the retainer cup retracts until the tab of the retainer cup returns to the hole of the A-shell, at which point the retainer cup is fully retracted again. The closure (5) can be replaced on the A-shell and the outer base.

[0066] Methods for replacing the barrel

[0067] When the user wishes to replace the cartridge, the closure (5) is removed from the refillable dispenser (10). Then, if the outer base (4) is provided, the outer base is separated from the inner base (3) by pushing down the distal end of the A-shaped shell (2) while pulling the outer base upward to overcome friction between the outer and inner bases. Next, the cartridge (8) is separated from the inner base by keeping the A-shaped shell stable while unscrewing the inner base from the retainer cup (1). The inner base, outer base, and closure can be repeatedly used with new cartridges of new rod products (9). The new cartridge is assembled to the inner base by keeping the A-shaped shell stable while screwing the inner base into the retainer cup until the A-shaped shell touches the closed end (3f) of the inner base. The proximal end (4f) of the outer base (4) slides on the distal end (2g) of the A-shaped shell (2) and slides downward until the shoulder (4e) of the outer base contacts the shoulder (2e) of the A-shaped shell. The closure (5) is fitted onto the distal end (2g) of the refillable dispenser (10).

Claims

1. A barrel assembly for rod-shaped products, the barrel assembly comprising: A retainer cup, the retainer cup being formed as a hollow stepped tube, the retainer cup comprising: Upper steps; The lower step has at least one cutout; At least one tab is positioned in each of the at least one incision and connected to the retainer cup by a flexible strut, which allows the tab to move radially inward when pressure is applied to the tab and causes the tab to return when the pressure is removed. The distal end, wherein the distal end is shaped into a cup capable of supporting one end of the rod-shaped product; and A threaded shaft is formed on the inner surface of the retainer cup; An A-shaped shell, wherein the A-shaped shell is formed as a hollow stepped tube, the A-shaped shell comprising: Upper steps; A lower step, the lower step having a proximal end and at least one hole; in: The retainer cup is located within the A-shaped shell, and at least one tab of the retainer cup protrudes through at least one hole in the A-shaped shell, such that the retainer cup and the A-shaped shell cannot move relative to each other.

2. The barrel assembly for rod-shaped products according to claim 1, wherein: The lower step of the retainer cup and the lower step of the A-shaped shell have different cross-sectional shapes, such that: The lower step of the retainer cup can be fitted into the lower step of the A-shaped shell with at least one opposing orientation, and It cannot be assembled into the lower step of the A-shaped shell with at least one other relative orientation.

3. The barrel assembly for rod-shaped products according to claim 1, wherein: The upper step of the retainer cup and the upper step of the A-shaped shell have the same non-circular cross-sectional shape.

4. A refillable dispenser for rod-shaped products, said refillable dispenser include: The feed cylinder assembly according to claim 1; An internal base, the internal base comprising: Cylindrical wall; A closed end, the closed end having an inner surface; and A threaded helix that rises from the inner surface of the closed end and has a distal end away from the closed end; in: The threaded helix of the inner base is screwed into the threaded shaft of the barrel sub-assembly; The at least one tab of the retainer cup is biased inward by the cylindrical wall of the inner base; and The retainer cup is prevented from rotating relative to the A-shaped shell, but the retainer cup can be translated vertically within the A-shaped shell by the relative rotation of the A-shaped shell and the inner base.

5. The refillable dispenser of claim 4, wherein the cup-shaped part of the retainer cup has a bottom having an opening for product filling.

6. The refillable dispenser of claim 5, wherein when the proximal end of the A-shaped shell touches the bottom in the inner base, the distal end of the threaded helix is ​​at least one complete threaded turn below the cup-shaped part of the retainer cup.

7. The refillable dispenser of claim 6, further comprising: An external base, which is formed as a hollow stepped tube, slides on the A-shaped shell and covers the lower step of the A-shaped shell and the internal base.

8. The refillable dispenser of claim 7, further comprising: Multiple longitudinal grooves are located on the outer surface of the cylindrical wall of the inner base; Multiple longitudinal protrusions are located on the inner surface of the cylindrical wall of the lower step of the outer base; The longitudinal protrusion of the outer base rests in the longitudinal groove of the inner base.

9. The refillable dispenser of claim 7, wherein the refillable dispenser does not use a lubricant.

10. A method for assembling a filling cylinder, the method comprising the following steps: Provide the barrel assembly according to claim 1; The retainer cup retracts completely within the A-shaped shell; Place the molded cap on the distal end of the A-shaped shell; Invert the barrel assembly; Insert the product filling nozzle through the proximal end of the retainer cup; as well as The product fills the volume in the barrel located between the molded cap and the bottom of the cup.

11. The method for assembling a filler cylinder according to claim 10, the method further comprising the step of: continuing to fill the product until at least one threaded ring of the threaded shaft is filled with the product.

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