Product dispenser

Abstract

A product dispenser, comprising a press head, a thread insert and an air cylinder, the thread insert being fixedly connected to the air cylinder, a piston rod being connected to the lower portion of the press head, and the piston rod extending into the air cylinder. The product dispenser further comprises an elastic pre-pressurizing mechanism. The elastic pre-pressurizing mechanism comprises a piston and a piston head which are arranged on the piston rod, the piston being movable relative to the piston head so as to be sealingly fitted to or disengaged from the piston head. The elastic pre-pressurizing mechanism further comprises an elastic portion, the upper end of the elastic portion being connected to the piston rod and the lower end thereof abutting against the piston. The elastic portion applies a biasing force onto the piston, so as to bias the piston to a position where the piston is fitted to the piston head. The structure of the product dispenser ensures that a product can be sprayed out from the product dispenser at a preset pressure, thereby achieving a required atomization effect without the need of providing a metal spring.

Description

A product dispenser Technical Field

[0001] The present application relates to the field of liquid and semi-liquid product packaging, and in particular to a product dispenser arranged on a container containing the product. Background Art

[0002] Product dispensers are widely used in daily chemical, pharmaceutical, food and other industries. They are mainly set on containers containing liquid and semi-liquid products to dispense products from the containers for consumers to use.

[0003] In order to produce a good spray effect, product dispensers such as spray pumps require a good pre-pressure before the liquid or semi-liquid product is sprayed out. To this end, these product dispensers are equipped with a pre-pressure valve. This pre-pressure valve allows the product in the container to accumulate to a predetermined pressure before it is dispensed, thereby ensuring that the product dispensed from the container has the desired pressure and speed, or that the product leaving the container has a certain atomization effect.

[0004] Traditional preload valves primarily work by pressing a small metal spring against a piston. However, metal springs present several issues with their grip. First, metal springs are susceptible to corrosion and rust from contact with the product, potentially contaminating the product. Furthermore, recycling the dispenser requires separating the metal spring from the rest of the dispenser, which is primarily made of plastic. This complicates recycling. Furthermore, with increasing environmental protection requirements, there is a demand for fully plasticized dispensers, making the traditional metal spring unsuitable for use in dispensers like spray pumps.

[0005] Therefore, there is a need for further improvement of the structure of the product dispenser to overcome the above technical problems existing in the prior art.

[0006] Summary of the Invention

[0007] The present invention is designed to address the technical problems existing in the prior art as described above. The purpose of the present invention is to provide an improved product dispenser that eliminates the metal components typically found in existing product dispensers while still being able to pre-pressurize the product in the container, thereby facilitating the recovery and recycling of the product dispenser.

[0008] The product dispenser of the present invention includes a pressure head, a socket and a cylinder, wherein the socket is fixedly connected to the cylinder, a piston rod is connected below the pressure head, and the piston rod extends into the cylinder. The product dispenser of the present application also includes an elastic pre-stressing mechanism, which includes: a piston, which is sleeved on the piston rod and can move relative to the piston rod along the longitudinal axis of the product dispenser; a piston head, which is fixedly connected to the piston rod and located below the piston, and can move relative to the piston head to seal with or disengage the seal with the piston head; and an elastic part, which is made of a non-metallic material, one end of the elastic part is connected or provided on one of the piston rod and the piston, and the other end of the elastic part is a free end and can abut on the other of the piston rod and the piston, wherein the elastic part applies a biasing force on the piston to bias the piston to a position that matches the piston head.

[0009] In this product dispenser, the elastic portion of the elastic preload mechanism applies a downward biasing force to the piston, ensuring a sealed fit between the piston and the piston head when the pressure in the cylinder is below a predetermined threshold. Only when the pressure head is pressed, causing the pressure in the cylinder to rise above a predetermined pressure, can the piston overcome the biasing force of the elastic portion and move upward, releasing the seal. This ensures that the product is dispensed from the product dispenser at a predetermined pressure without the need for a metal spring, achieving the desired atomization effect.

[0010] Specifically, the piston includes: an outer ring, which has an interference fit with the inner wall of the cylinder; and an inner ring, the lower end of which is in a shape that gradually shrinks from top to bottom; and the upper part of the piston head is in a shape that gradually expands from bottom to top and outward. When the lower end of the inner ring is matched with the upper part of the piston head, a seal is formed between the piston and the piston head.

[0011] In an exemplary structure, the piston rod includes a main body portion and a piston head connecting rod connected to the lower part of the main body portion, the lower end of the piston head connecting rod is connected to or integrally formed with the piston head, wherein an elastic portion is connected to or integrally formed at the lower end of the main body portion.

[0012] Preferably, the piston further comprises a connecting web connecting the inner ring and the outer ring, and the lower end of the elastic portion abuts against the connecting web.

[0013] Preferably, the elastic portion includes a plurality of thin-sheet elements, which are in a tapered shape, wherein the wider end of the thin-sheet element is connected to the lower end of the piston rod, and the smaller end of the thin-sheet element is a free end capable of abutting against the piston.

[0014] Preferably, the height of the thin element when unloaded is H1. When the thin element abuts the piston, the narrower end of the thin element deforms, causing the height of the thin element to become H2, where H1 is greater than H2. Thus, after installation, the thin element of the elastic portion applies preload to the piston, thereby biasing the piston to a position that mates with the piston head.

[0015] Preferably, the free end of the resilient portion is in sliding engagement with one of the piston rod and the piston. For example, if the resilient portion comprises a thin element, the thin end of the thin element with the narrowest width is in sliding contact with the piston. In this way, when the ram is rotated to open or close the product dispenser, the resilient portion (e.g., the thin element) is not damaged by the torque generated by the ram's rotation. Furthermore, the sliding contact between the resilient portion and the piston rod or piston prevents the resilient portion from obstructing the ram's rotation.

[0016] In another exemplary structure, a supporting protrusion is formed on the outer peripheral surface of the piston rod, and the upper end of the elastic portion abuts against the supporting protrusion.

[0017] Preferably, the inner surface of the piston's inner ring is formed to taper downward from top to bottom, and the outer surface of the piston rod's mating portion is also formed to taper downward from top to bottom. This tapered structure gradually increases the interference fit between the piston and rod when the piston is forced upward relative to the rod, enhancing the seal between the two. Furthermore, this increases the force required to move the piston upward relative to the rod, thereby increasing preload and, in turn, improving the atomization effect.

[0018] Preferably, the elastic portion is cylindrical, and in order to help the elastic portion bend, a bending promoting structure is formed on the side wall of the cylindrical elastic portion.

[0019] The bending facilitating structure may be at least one of the following structures: a bent portion, a hollow portion, and a thin-walled portion formed on the side wall of the elastic portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings illustrate non-limiting preferred embodiments of the present invention, and the features and advantages of the present invention will become more apparent when combined with the accompanying drawings.

[0021] FIG1 shows a cross-sectional view of a product dispenser according to a first embodiment of the present application.

[0022] FIG. 2 is a cross-sectional view of the elastic pre-compression mechanism of the product dispenser in FIG. 1 in an assembled state.

[0023] FIG3 is an exploded cross-sectional view of the elastic preload mechanism of FIG2 .

[0024] FIG. 4 is an exploded perspective view of the elastic preload mechanism of FIG. 2 .

[0025] 5a to 5f show other alternative embodiments of the elastic portion.

[0026] FIG6 shows a cross-sectional view of a product dispenser according to a second embodiment of the present application.

[0027] FIG. 7 is an exploded perspective view of the elastic pre-compression mechanism in the product dispenser in FIG. 6 .

[0028] FIG. 8 is a perspective view showing the elastic portion of the elastic pre-compression mechanism of FIG. 7 .

[0029] 9a to 9d show other alternative embodiments of the elastic portion.

[0030] (Explanation of Reference Symbols) 100 Product dispenser 110 Press head 111 Inner sleeve 120 Socket 130 Cylinder 140 Piston rod 141 Piston head 142 Outer skirt 143 Piston head connecting rod 144 Flow channel groove 150 Piston 151 Inner ring 152 Outer ring 153 Connecting web 160 Elastic portion 200 Product dispenser 210 Press head 240 Piston rod 241 Piston head 242 Piston head mounting portion 243 Support protrusion 244 Inclined portion 250 Piston 251 Inner ring 260 Elastic portion DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the drawings illustrate only preferred embodiments of the present invention and do not limit the scope of the present invention. Those skilled in the art may make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings. Furthermore, the technical features of the different embodiments described below may be arbitrarily combined with each other, provided that no contradiction exists. All of these combinations fall within the scope of protection of the present invention.

[0032] In addition, the expressions related to directions such as "up" and "down" used in this article are based on the orientation of the product dispenser when in use. Those skilled in the art will know that in some cases, such as during transportation, storage, etc., the orientation of the product dispenser may change.

[0033] <First embodiment>

[0034] 1 to 5e show a product dispenser 100 according to a first embodiment of the present application. The product dispenser 100 is in the form of a press pump.

[0035] The product dispenser 100 includes a ram 110, a threaded sleeve 120, and a cylinder 130. The threaded sleeve 120 and the cylinder 130 are fixedly connected. The inner surface of the outer ring of the threaded sleeve 120 may be formed with a structure, such as an internal thread, which can mate with a structure, such as an external thread, on the mouth of a container, thereby securing the product dispenser 100 to the container. A piston rod 140 is disposed below the ram 110. The ram 120 includes an inner sleeve 111 extending downward, and the piston rod 140 is connected to the lower end of the inner sleeve 111 of the ram 110. For example, the connection between the piston rod 140 and the inner sleeve 111 can be achieved through a convex ring-annular groove structure, as shown in the figure. In addition to the connection method shown in the figure, the piston rod 140 can also be connected to the inner sleeve 111 through other methods known in the art, such as threaded connection, interference fit, etc.

[0036] A piston 150 is provided at the lower portion of the piston rod 140. The piston 150 is interference-fitted with the inner surface of the cylinder 130 so as to be relatively movable. As the piston 150 moves in the cylinder 130 along the longitudinal axis of the product dispenser 100, or in the up-down direction, the pressure in the cylinder 130 increases or decreases, thereby pumping the product in the cylinder 130 out through the product channel in the pressure head 110, and replenishing the interior of the cylinder 130 with product from the container.

[0037] A piston head 141 is formed at one end of the piston rod 140 (the lower end in the figure), and the piston head 141 is located below the piston 150. As the piston 150 moves in the up and down directions relative to the cylinder 130, the piston 150 can engage with or disengage from the piston head 141.

[0038] The product dispenser 100 is provided with an elastic pre-compression mechanism. The structure of the elastic pre-compression mechanism will be described in detail below with reference to Figures 2 to 4. Figure 2 shows a cross-sectional view of the assembled elastic pre-compression mechanism, Figure 3 shows a cross-sectional view of the various components of the elastic pre-compression mechanism, and Figure 4 shows an exploded perspective view of the elastic pre-compression mechanism, from which the components of the elastic pre-compression mechanism can be more clearly seen.

[0039] As shown in the figure, the elastic preload mechanism mainly includes a piston head 141 disposed on a piston rod 140 and a piston 150 that is relatively movably mounted on the piston rod 140. The piston rod 140 can include two interconnected parts, namely, a main body of the piston rod 140 and a piston head connecting rod 143 connected to the main body. The piston head connecting rod 143 is connected to the main body of the piston rod 140 via a convex ring-annular groove structure, as shown in the structure. Alternatively, the piston head connecting rod 143 can be connected to the main body of the piston rod 140 via other connection methods, such as a snap-fit ​​connection or a threaded connection.

[0040] Preferably, as shown in the figure, a flow groove 144 is formed on the outer surface of the piston head connecting rod 143. When the piston head connecting rod 143 is connected to the main part of the piston rod 140, a channel can be formed between the piston head connecting rod 143 and the main part of the piston rod 140 to allow the product to flow through and flow into the product channel in the pressure head 110 to eventually pump out the product.

[0041] The piston head 141 is formed at the lower end of the piston head connecting rod 143 and is connected to the piston rod 140 via the piston head connecting rod 143. Preferably, the piston head 141 can be formed integrally with the piston head connecting rod 143. Alternatively, the piston head 141 can be formed separately and then connected to the piston head connecting rod 143 by a method known in the art.

[0042] The piston 150 is sleeved on the piston rod 140. For example, as shown in FIG2 , the piston 150 can be sleeved on the piston head connecting rod 143. In addition, the piston 150 can cooperate with the piston head 141, and a seal is formed or released between the piston head 141 and the piston 150 as the piston 150 moves relative to the piston rod 140, which will be described in more detail below.

[0043] The piston 150 includes an inner ring 151, an outer ring 152, and a connecting web 153 connecting the inner ring 151 and the outer ring 152. The piston head 141 is formed with an outer peripheral skirt 142 on its outer periphery. The upper portion of the outer peripheral skirt 142 is in a shape that gradually expands outward from bottom to top.

[0044] The outer ring 152 of the piston 150 is interference-fitted with the interior of the cylinder 130, thereby forming a seal between the piston 150 and the cylinder 130. The lower end of the inner ring 151 of the piston 150 is formed with an inclined surface, which can cooperate with the outer peripheral skirt 142 of the piston head 141, thereby forming a seal between the piston 150 and the piston head 141 when the piston 150 and the piston head 141 are fitted together.

[0045] Furthermore, the elastic preload mechanism also includes an elastic portion 160 formed on the piston rod 140 , one end of which is connected to the piston rod 140 , for example, to the lower end of the main body of the piston rod 140 , and the other end abuts against the piston 150 in the installed state.

[0046] The lower end of the elastic portion 160 can be supported on the connecting web 153 connected between the inner ring 151 and the outer ring 152. Of course, if necessary, the elastic portion 160 can also be supported on other parts of the piston 150, for example, on the top of the inner ring 151 of the piston 150, etc.

[0047] In the exemplary structure shown in Figures 2-4, the elastic portion 160 includes multiple thin-film elements, such as the four thin-film elements shown in the figures, evenly spaced (i.e., spaced 90 degrees apart) along the circumference of the lower end of the piston rod 140. The thin-film elements have a tapering shape from top to bottom, with the upper end of the thin-film element having a greater width than the lower end and connected to the lower end of the piston rod 140. The lower end of the thin-film element has a relatively smaller width. Furthermore, preferably, the lower end of the thin-film element is pointed, or in other words, the thin-film element has a roughly triangular shape. Of course, the thin-film elements may also adopt other shapes that are wider at the top and narrower at the bottom.

[0048] The thin-film element of the elastic portion 160 is made of an elastic material, such as plastic, rubber, etc. In the installed state shown in FIG2 , the narrower lower end of the thin-film element abuts against the piston 150, for example, against the upper surface of the connecting web 153, and is slightly deformed, thereby reducing the height of the thin-film element. Specifically, as schematically shown in the figure, in the unstressed state, the height of the thin-film element is H1. When the thin-film element abuts against the piston 150, its narrower lower end portion is deformed, thereby reducing the height of the thin-film element to H2. It can be seen that H2 is smaller than H1. In this way, the elastic portion 160 applies a preload to the piston 150, thereby biasing the piston 150 into a position where it is sealed and fitted with the piston head 141.

[0049] Furthermore, the thin-film element is arranged so that its lower end is in slidable contact with the piston 150. In this way, when the ram 110 is rotated to open and close the product dispenser 100, the thin-film element of the elastic portion 160 can be prevented from being damaged by the torsional force. On the other hand, the elastic portion 160 can be prevented from obstructing the rotation of the ram 110, thereby preventing the product dispenser 100 from being opened or closed.

[0050] The elastic portion 160 may be made of a non-metallic material, for example, the same material as the piston rod 140 and other components of the product dispenser 100 , that is, a plastic material, or may be made of other non-metallic elastic materials, such as rubber.

[0051] Preferably, the inner surface of the inner ring 151 of the piston 150 is formed into a shape that tapers from top to bottom, and the outer surface of the portion of the piston rod 140 that mates with the piston 150 is also formed into a shape that tapers from top to bottom. Here, the portion of the piston rod 140 that mates with the piston 150 refers to the portion of the piston rod 140 (including the main body and the piston head connecting rod 143) that is within the range of the piston 150's upward movement, or in other words, the portion of the piston rod 140 that will contact the piston 150 during the pressing and resetting process of pumping the product. This tapered shape allows the interference fit between the piston 150 and the piston rod 140 to gradually increase as the piston 150 moves upward relative to the piston rod 140 during the process of pressing the ram 110 to pump the product outward, thereby strengthening the seal and increasing the preload. The increase in preload can increase the flow rate of the fluid, thereby improving the atomization performance.

[0052] In addition to the thin-sheet elements shown in the exemplary embodiments of Figures 2-4, the elastic portion 160 may also take other forms. For example, in the structure shown in Figure 5a, the elastic portion 160 comprises two generally elliptical elastic elements. In Figure 5b, the elastic portion 160 comprises two generally semicircular elastic rings. In Figure 5c, the elastic portion 160 comprises a lower support ring and several generally U-shaped elastic strips, the upper ends of which are connected to the piston rod 140 and the lower ends to the lower support ring. For another example, in Figure 5d, the elastic portion 160 comprises two semicircular elastic rings with notches formed at their lower ends. In the structure shown in Figure 5e, the elastic portion 160 comprises a lower support ring and several obliquely extending elastic strips connected between the lower support ring and the piston rod 140. Figure 5f shows that the elastic portion 160 comprises several arcuate elastic strips, one end of which is connected to the piston rod 140 and the other end is free and supported by the piston 150. Other conventional alternative elastic portion structures shown in the drawings and readily apparent to those skilled in the art are within the scope of the present application.

[0053] The operating principle of the product dispenser 100 will be described in detail below:

[0054] When the ram 110 is in the upper standby state, the elastic portion 160 is in its initial shape and biases the piston 150 to the lower position where it cooperates with the piston head 141. At this time, the inclined surface at the lower end of the inner ring 151 of the piston 150 cooperates with the gradually expanding portion at the upper end of the outer skirt 142 of the piston head 141, forming a seal between the piston 150 and the piston head 141, thereby preventing the product in the cylinder 130 from flowing toward the ram 110.

[0055] As the user presses down on the pressure head 110, the piston rod 140 and the piston 150 connected to it also move downward. During this process, the volume of the cylinder 130 decreases, causing the pressure within the cylinder 130 to increase. This pressure acts on the piston 150, causing it to overcome the biasing force of the elastic portion 160 and move upward relative to the piston rod 140 and the piston head 141, breaking the engagement with the piston head 141 and thereby releasing the seal between the piston 150 and the piston head 141. During this process, the elastic portion 160 is compressed and deformed, accumulating elastic force within the elastic portion 160.

[0056] After the pressure applied to the pressure head 110 is removed, the pressure head 110 moves upward, carrying the piston rod 140 with it. The piston head 141 and piston 150 on the piston rod 140 also initially move upward. During this process, the volume within the cylinder 130 increases, causing the pressure therein to drop. Consequently, the piston 150, under the elastic force of the elastic portion 160, moves relative to the piston head 141 and eventually re-engages with the piston head 141, re-forming a seal between the piston head 141 and the piston 150. Subsequently, or simultaneously, the product in the container is replenished into the space within the cylinder 130, ready for the next pumping.

[0057] In the structure described above with reference to the accompanying drawings, the upper end of the elastic portion 160 is connected to the piston rod 140, and the lower end is a free end that abuts against the piston 150. Those skilled in the art will appreciate that the elastic portion 160 may also be formed with the lower end connected to the piston 150 and the upper end being a free end that abuts against the piston rod 140, and such obvious replacements are also within the scope of the present application.

[0058] <Second embodiment>

[0059] Figures 6 to 9d show a product dispenser 200 according to a second embodiment of the present invention. Unless otherwise specified or conflicting, the specific structures described above with respect to the first embodiment also apply to the second embodiment. The following describes in detail the structures of the second embodiment that differ from the first embodiment.

[0060] In the second embodiment, the product dispenser 200 includes a pressing head 210 and a piston rod 240 connected to the lower portion of the pressing head 210. The product dispenser 200 also includes an elastic pre-pressing mechanism.

[0061] Figure 7 shows an exploded perspective view of the elastic preload mechanism. Similar to the first embodiment, the elastic preload mechanism includes a piston head 241 and a piston 250, which are mounted on a piston rod 240. Unlike the first embodiment, the piston head 241 is a cup-shaped component with an inclined portion 244 formed on its upper end. This inclined portion 244 is gradually expanding from bottom to top and mates with the inclined lower end of the inner ring 251 of the piston 250 to form a seal between the piston head 241 and the piston 250. Accordingly, a piston head mounting portion 242 is formed at the lower end of the piston rod 240, with which the piston head 241 can mate, thereby being mounted on the piston rod 240.

[0062] In the product dispenser 200 of the second embodiment, the elastic portion 260 of the elastic pre-compression mechanism is a separately formed component, the lower end of which is supported on the piston 250, and the upper end is supported on a supporting protrusion 241 formed on the outer circumferential surface of the piston rod 240. The supporting protrusion 241 can be in the form of a continuous raised ring, or can also be a plurality of discontinuous protrusions arranged along the circumference of the piston rod 240.

[0063] Figure 8 shows a perspective view of the elastic portion 260, which has a generally bulging cylindrical shape. Those skilled in the art will appreciate that this cylindrical structure of the elastic portion 260 can also be applied to the first embodiment. Furthermore, to facilitate deformation of the elastic portion 260, a bending-promoting structure can be provided on the sidewall of the elastic portion 260 to facilitate bending deformation of the elastic portion 260. This bending-promoting structure can be one or a combination of the following: a curved portion, a hollow portion, a thin-walled portion, etc.

[0064] In addition, the elastic portion 260 may also take a variety of other forms. For example, in Figure 9a, the elastic portion 260 is formed to include an upper support ring, a lower support ring, and a plurality of elastic strips connected between the upper and lower support rings. Alternatively, the elastic portion 260 may be in a generally cylindrical shape with notches provided at the upper and lower ends, as shown in Figures 9b and 9c. In Figure 9b, the elastic portion 260 is shown as a cylindrical shape with a central outward bulge, while in Figure 9c, the elastic portion 260 is shown as a cylindrical shape with a central narrowing. For another example, as shown in Figure 9d, the elastic portion 260 may also take the form of a bellows.

Claims

1. A product dispenser, comprising a pressure head, a toothed sleeve and a cylinder, wherein the toothed sleeve is fixedly connected to the cylinder, a piston rod is connected below the pressure head, and the piston rod extends into the cylinder, wherein: The product dispenser further comprises an elastic pre-pressing mechanism, wherein the elastic pre-pressing mechanism comprises: a piston, the piston being sleeved on the piston rod and being movable relative to the piston rod along the longitudinal axis of the product dispenser; a piston head, the piston head being fixedly connected to the piston rod and being located below the piston, and the piston being movable relative to the piston head to seal with or disengage from the piston head; and An elastic part, wherein the elastic part is made of a non-metallic material, one end of the elastic part is connected to or arranged on one of the piston rod and the piston, and the other end of the elastic part is a free end and can abut against the other of the piston rod and the piston, wherein the elastic part applies a biasing force on the piston to bias the piston to a position matching the piston head.

2. The product dispenser according to claim 1, characterized in that The piston comprises: an outer ring, the outer ring is interference-fitted with the inner wall of the cylinder; and an inner ring, the lower end of the inner ring is in a shape that tapers from top to bottom; and The upper part of the piston head is in a shape that gradually expands outward from bottom to top, and when the lower end of the inner ring matches with the upper part of the piston head, a seal is formed between the piston and the piston head.

3. The product dispenser according to claim 1 or 2, characterized in that The piston rod comprises a body part and a piston head connecting rod connected to the lower part of the body part, wherein the lower end of the piston head connecting rod is connected to or integrally formed with the piston head. Wherein, the elastic part is connected to or integrally formed at the lower end of the main body part.

4. The product dispenser according to claim 2, characterized in that The piston further includes a connecting web connecting the inner ring and the outer ring, and the lower end of the elastic portion abuts against the connecting web.

5. The product dispenser of claim 1, wherein: The elastic part includes a plurality of thin-sheet elements, each of which is in a tapered shape. The end of the thin-sheet element with a larger width is connected to the lower end of the piston rod, and the end of the thin-sheet element with a smaller width is a free end and can abut against the piston.

6. The product dispenser according to claim 5, characterized in that The height of the thin-film element when not under force is H1. When the thin-film element abuts against the piston, the end of the thin-film element with a smaller width is deformed, so that the height of the thin-film element becomes H2, wherein H1 is greater than H2.

7. The product dispenser of claim 1, wherein: The free end of the elastic portion is capable of sliding contact with one of the piston rod and the piston.

8. The product dispenser according to claim 1 or 2, characterized in that A supporting protrusion is formed on the outer peripheral surface of the piston rod, and the upper end of the elastic part abuts against the supporting protrusion.

9. The product dispenser of claim 2, wherein: The inner surface of the inner ring of the piston is formed into a shape that tapers from top to bottom, and the outer surface of the portion of the piston rod that matches the piston is also formed into a shape that tapers from top to bottom.

10. The product dispenser of claim 1, wherein: The elastic part is cylindrical, and a bending promoting structure is formed on a side wall of the cylindrical elastic part.

11. The product dispenser of claim 10, wherein: The bending facilitating structure is at least one of the following structures: a bent portion, a hollow portion, and a thin-walled portion formed on a side wall of the elastic portion.

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