Lower lock pressing pump

Abstract

A down lock pressing pump includes a fixed portion and a movable portion, and further includes an elastic reset mechanism formed as an elastic extension spring, where the elastic reset mechanism is disposed between the fixed portion and the movable portion. The lower lock head pressing pump further comprises a lock head switching mechanism which is arranged on the movable part, connected with the elastic reset mechanism and capable of moving between a first position and a second position relative to the movable part, in the first position, the lock head switching mechanism sets the elastic reset mechanism in a non-stretching state or a slight stretching state, and in the second position, the lock head switching mechanism sets the elastic reset mechanism in a pre-stretching state. According to the structure of the lower lock head pressing pump, the lower lock head is achieved, and the problem that the elasticity of the extension spring is attenuated due to the fact that the extension spring is in a loading state for a long time can be reduced or even avoided.

Description

Technical Field

[0001] This application relates to the field of product dispensing devices, and more specifically to a lower-position lock-type push pump that is installed on a container containing product for pumping the product out of the container for consumer use. Background Technology

[0002] Press pumps are widely used in industries such as daily chemicals, food, and pharmaceuticals, dispensing liquid or semi-liquid products from containers for use. Most press pumps on the market today include a metal spring to bias the pump into its ready-to-use position. Furthermore, press pumps also have a locking position for use during product transportation, storage, and sales. In this locking position, the pump head is locked to prevent accidental downward pressing and misoperation.

[0003] Recently, to meet increasingly stringent environmental protection requirements and facilitate the recycling and reuse of push pumps, the industry has begun to use springs made of plastic materials to replace metal springs. Currently, most of the plastic springs used are plastic push springs. However, in application, these plastic push springs used in push pumps have exhibited some problems.

[0004] For example, in the case of the lower lock cylinder's push pump, the plastic push spring is compressed when the push pump is in the lower lock cylinder position. After prolonged compression, due to its material properties, the plastic push spring will yield and deform, thus its elastic force will gradually decrease until it completely fails.

[0005] In addition, during use, a large pressing force is required to deform the plastic pressing spring. Therefore, the user's pressing feels heavy, but the elasticity of the compressed plastic pressing spring is relatively small. As a result, after several presses, it may fail to return to the top dead center of the press head's stroke.

[0006] Therefore, for push pumps using plastic springs, there is a need to improve their structure in order to solve at least one of the problems mentioned above in the prior art, such as spring force attenuation, heavy pressing feel, and incomplete rebound of plastic springs used in push pumps. Utility Model Content

[0007] This application is made to address the problems existing in the prior art described above. The purpose of this application is to provide a lower-position lock cylinder press pump with an improved structure, which effectively reduces the degree of spring force attenuation in its plastic spring. Furthermore, the plastic spring of this lower-position lock cylinder press pump can generate better spring force, reducing or eliminating the issues of heavy pressing feel and incomplete rebound.

[0008] The lower-position lock cylinder pressing pump of this application includes a fixed part and a movable part. Furthermore, the lower-position lock cylinder pressing pump also includes an elastic reset mechanism, which is formed as an elastic tension spring and is disposed between the fixed part and the movable part. The lower-position lock cylinder pressing pump also includes a lock cylinder switching mechanism, which is disposed on the movable part and connected to the elastic reset mechanism. This switching mechanism is movable relative to the movable part between a first position and a second position. In the first position, the lock cylinder switching mechanism sets the elastic reset mechanism to a non-tensioned or slightly tensioned state; in the second position, the lock cylinder switching mechanism sets the elastic reset mechanism to a pre-tensioned state.

[0009] With the lower lock head pressing pump of this structure, when the lower lock head pressing pump is in the lower lock head position, the elastic tension spring can be in a state of no stretching or only slight stretching. This can achieve the lower lock head and effectively reduce or even avoid the problem of tension spring attenuation due to long-term loading.

[0010] In one specific exemplary structure, the movable part includes a pressure head and a piston rod disposed below the pressure head, the fixed part includes a toothed sleeve and a cylinder assembly fixedly connected to the toothed sleeve, and the lock head switching mechanism is sleeved on the piston rod, wherein one end of the elastic reset mechanism is fixedly engaged with the cylinder assembly, and the other end of the elastic reset mechanism is engaged with the lock head switching mechanism.

[0011] Furthermore, the lock switching mechanism is configured to move between a first position and a second position by rotating the pressure head.

[0012] As an example structure, a spiral guide protrusion is provided on the outer circumferential surface of the piston rod, and a guide groove is provided inside the lock switching mechanism, which can cooperate with the guide protrusion. When the guide groove and the guide protrusion are engaged, the lock switching mechanism will move up and down along the axis of the press pump as the piston rod rotates, so as to achieve movement between a first position and a second position.

[0013] Preferably, the cylinder assembly includes a cylinder and a cylinder plug, the cylinder plug being fixedly connected to the dental valve. Multiple circumferentially arranged fixed protrusions are provided on the upper inner surface of the cylinder, and one end of the elastic return mechanism is fixed to one of the fixed protrusions. This arrangement of the elastic return mechanism allows it to generate better tensile force, thus reducing the feeling of pressing the pressure head and further helping to solve the problem of the pressure head not rebounding to the top.

[0014] In one specific structure, the elastic reset mechanism includes at least one elastic strip, an upper ring, and a lower ring, wherein the upper end of the elastic strip is connected to the upper ring, and the lower end of the elastic strip is connected to the lower ring. A gap is formed between two adjacent fixed protrusions; during installation, the upper ring is fixed to the fixed protrusion, and the elastic strip fits into the gap.

[0015] Regarding the specific cooperation between the lock switching mechanism and the elastic reset mechanism, as an example structure, a support protrusion is formed on the outer peripheral surface of the lock switching mechanism, and the other end of the elastic reset mechanism cooperates with the support protrusion. Through cooperation with the support protrusion, the lower ring of the elastic reset mechanism can move closer to or further away from the upper ring as the lock switching mechanism moves between the first and second positions, thereby switching between an unstretched or slightly stretched state and a pre-stretched state.

[0016] Preferably, the resilient reset mechanism is configured to rotate relative to the movable part. This way, when the movable part, such as the piston rod, rotates to change the position of the lock switching mechanism, the resilient reset mechanism will not rotate with it. This prevents the resilient reset mechanism from being twisted or constricted. Attached Figure Description

[0017] The accompanying drawings illustrate a non-limiting preferred embodiment of the present invention. The features and advantages of the present invention become more apparent when viewed in conjunction with the drawings. Specifically:

[0018] Figure 1 A cross-sectional view of an exemplary structure of the press pump of this application is shown.

[0019] Figure 2 Shown Figure 1 A front view of a push-button pump, wherein the push-button pump is partially cut out to show the structure of components such as the elastic reset mechanism and the lock switching mechanism.

[0020] Figure 3 Shown Figure 1 A three-dimensional view of the elastic reset mechanism in a press pump.

[0021] Figure 4 Shown Figure 1 A three-dimensional view of the cylinder and cylinder plug assembled together in a press pump.

[0022] Figure 5 Shown Figure 1 A 3D view of the lock switching mechanism in the press pump.

[0023] Figure 6 An exploded perspective view of the push pump, including the cylinder, the elastic reset mechanism, and the lock switching mechanism, is shown.

[0024] Figure 7A cross-sectional view of the push pump, including the cylinder, the elastic reset mechanism, and the lock switching mechanism, is shown.

[0025] Figure 8 A perspective view shows the piston rod of the press pump, the elastic reset mechanism, and the lock switching mechanism assembled together, with the lower lock position shown.

[0026] Figure 9 Another perspective view shows the piston rod, elastic reset mechanism, and lock switching mechanism of the press pump assembled together, in which the pre-stretched state is shown.

[0027] Figure 10 Another perspective view shows the piston rod, elastic reset mechanism, and lock switching mechanism of the press pump assembled together, showing the state of being pressed down.

[0028] (Symbol Explanation)

[0029] 1. Press pump

[0030] 10 pressure heads

[0031] 20 braces

[0032] 31 cylinders

[0033] 32 cylinder piston

[0034] 33 fixed protrusions

[0035] 34 gap

[0036] 40-rod piston

[0037] 41 Guide convex strip

[0038] 50 elastic reset mechanism

[0039] 51 elastic strip

[0040] 52 upper circle

[0041] 53 Lower Circle

[0042] 60 lock switching mechanism

[0043] 61 Supporting protrusion

[0044] 62 guide slots Detailed Implementation

[0045] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are merely preferred embodiments of this utility model and do not constitute a limitation on the scope of this utility model. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to this utility model based on the embodiments shown in the drawings. Furthermore, without contradiction, the technical features in the different embodiments described below can be arbitrarily combined with each other, all of which fall within the protection scope of this utility model.

[0046] Figure 1 A cross-sectional view of the press pump 1 of this application is shown. Figure 2 This shows a partial cross-sectional view of the press pump 1. Figure 1 and 2 The push pump 1 shown is specifically an all-plastic push pump for the lower lock head.

[0047] The press pump 1 includes a fixed part and a movable part, the movable part being capable of reciprocating vertically relative to the fixed part. Specifically, the movable part may include a press head 10, and the fixed part may include a toothed sleeve 20 and a cylinder 31, the toothed sleeve 20 and the cylinder 31 being fixedly connected together. In some specific configurations, a cylinder plug 32 is mounted on the cylinder 31, such as... Figure 7 As shown, the cylinder plug 32 is connected to the dental sleeve 20, so the cylinder 31 is fixedly connected to the dental sleeve 20 through the cylinder plug 32.

[0048] A piston rod 40 is formed or connected to the lower part of the pressure head 10. A piston is provided at the lower end of the piston rod 40 and extends into the cylinder 31. The piston is in a sealing fit with the inner surface of the cylinder 31. In this way, the reciprocating motion of the piston rod 40 and the piston on it relative to the cylinder 31 driven by the pressure head 10 can draw the product into the cylinder 31 and pump the product out.

[0049] The press pump 1 of this application also includes an elastic reset mechanism 50, which is specifically a plastic tension spring, and in the installed state, the elastic reset mechanism 50 is sleeved on the piston rod 40. Figure 3 A perspective view of an exemplary structure of the elastic reset mechanism 50 is shown. The elastic reset mechanism 50 includes at least one elastic strip 51, and also includes an upper ring 52 and a lower ring 53. The upper end of the elastic strip 51 is connected to the upper ring 52, and the lower end of the elastic strip 51 is connected to the lower ring 53.

[0050] In the exemplary structure shown in the figure, the elastic reset mechanism 50 includes four elastic strips 51 arranged at equal intervals along the circumference, and these elastic strips 51 are linear in structure. In addition, depending on the needs of the actual application, the elastic reset mechanism 50 may also include other numbers of elastic strips 51. The elastic strips 51 can be arranged at equal intervals, but unequal intervals are also within the scope of this application. Furthermore, besides the linear shape shown in the figure, the elastic strips 51 can also take other shapes, such as arcuate shapes, etc.

[0051] Figure 4 A perspective view of cylinder 31 is shown. Several circumferentially arranged fixed protrusions 33 are provided at the upper end of cylinder 31. In the installed state, the upper ring 52 of the elastic reset mechanism 50 is fixed to the fixed protrusions 33. A gap 34 is formed between two adjacent fixed protrusions 33, allowing the elastic strip 51 of the elastic reset mechanism 50 to pass through.

[0052] The press pump 1 also includes a lock-switching mechanism 60, which is cylindrical and fitted onto the outer periphery of the piston rod 40. The lock-switching mechanism 60 can switch positions longitudinally relative to the piston rod 40. In the illustrated exemplary structure, a spiral guide protrusion 41 is formed on the outer peripheral surface of the piston rod 40, and a guide groove 62 matching the shape of the guide protrusion 41 is formed inside the lock-switching mechanism 60. When the lock-switching mechanism 60 is fitted onto the piston rod 40, the guide protrusion 41 and the guide groove 62 engage. When the press head 10 is rotated, the piston rod 40 rotates accordingly. Thus, through the engagement between the spiral guide protrusion 41 and the guide groove 62, the rotation of the piston rod 40 causes the lock-switching mechanism 60 to move vertically relative to the piston rod 40.

[0053] Besides the mating structure between the lock switching mechanism 60 and the piston rod 40 shown in the figure, other structures can also be used to achieve the vertical movement of the lock switching mechanism 60 relative to the piston rod 40. For example, a spiral groove can be formed on the outer circumferential surface of the piston rod 40, and a protrusion that can mate with the spiral groove can be formed inside the lock switching mechanism 60. Alternatively, a raised rib can be formed on the outer circumferential surface of the piston rod 40, and a groove can be formed inside the guide groove 62. When the raised rib and the groove are aligned, the lock switching mechanism 60 is allowed to move vertically relative to the piston rod 40; when the raised rib and the groove are misaligned, the vertical position of the lock switching mechanism 60 relative to the piston rod 40 is locked.

[0054] Supporting protrusions 61 are provided on the outer peripheral surface of the lock switching mechanism 60. For example, in the exemplary structure shown in the figure, two supporting protrusions 61 are provided that are opposite each other (or spaced 180° apart) along the diameter direction of the cross-section of the lock switching mechanism 60. The lower ring 53 of the elastic reset mechanism 50 cooperates with the supporting protrusions 61. As the lock switching mechanism 60 moves up and down relative to the piston rod 40, it will drive the lower ring 53 of the elastic reset mechanism 50 to move up and down, thereby realizing the pre-stretching and relaxation operation of the elastic strip 51.

[0055] In a preferred embodiment, the resilient reset mechanism 50 is configured to rotate relative to the pressure head 10 and the piston rod 40. This prevents the resilient reset mechanism 50 from rotating along with the pressure head 10 and the connected piston rod 40. This arrangement prevents the resilient reset mechanism 50 from twisting during the rotation of the pressure head 10 to switch the position of the lock switch mechanism 60.

[0056] Figures 8-10 Perspective views are shown of the piston rod 40, elastic reset mechanism 50, and lock switching mechanism 60 of the press pump 1 of this application in different states when they are assembled together. Figure 8 In the shown state, the lock switching mechanism 60 is located above the piston rod 40, and the lower ring 53 of the elastic reset mechanism 50 is in a position with a small distance between it and the upper ring 52. At this time, the elastic strip 51 of the elastic reset mechanism 50 is in an unstretched or slightly stretched state, that is, the elastic strip 51 of the elastic reset mechanism 50 is relatively relaxed. And at this time, the pressure head 10 can be set at the lower lock position.

[0057] When the pump 1 is turned on, the pressure head 10 moves upward and rotates in the first direction (e.g., counterclockwise), causing the lock switching mechanism 60 to move downward relative to the piston rod 40. As the lock switching mechanism 60 moves downward, the lower ring 53 of the elastic reset mechanism 50 also moves downward under the action of the support protrusion 61, increasing the distance between the lower ring 53 and the upper ring 52. This stretches the elastic strip 51 of the elastic reset mechanism 50, switching the elastic reset mechanism 50 to a preloaded state. Figure 9 As shown.

[0058] During use, pressing down on the pressure head 10 causes the piston rod 40 and the locking head switching mechanism 60 to move downwards together, further stretching the elastic strip 51 of the elastic reset mechanism 50. When the pressure head 10 is pressed to its lower limit of travel, the elastic strip 51 is stretched to its longest state, such as... Figure 10 As shown. When the pressing force applied to the pressure head 10 is removed, the tension in the stretched elastic strip 51 will cause the piston rod 40 and the pressure head 10 to return to their top dead center position.

[0059] When it is necessary to set the pressure head 10 to the lower lock position, press the pressure head 10 down while rotating it in a second direction opposite to the first direction (e.g., clockwise), causing the piston rod 40 to rotate together. This rotation of the piston rod 40 in the second direction causes the lock switching mechanism 60 to move upward relative to the piston rod 40. During this process, the distance between the upper coil 52 and the lower coil 53 of the elastic reset mechanism 50 shortens, causing the elastic bar 51 of the elastic reset mechanism 50 to relax.

[0060] In the press pump 1 with the above structure, when the press pump 1 is in its lower lock position, the elastic reset mechanism 50 in the form of a plastic tension spring can be in an unstretched or slightly stretched state. In this way, during the transportation, storage and sales of the product, the elastic reset mechanism 50 will not experience elasticity attenuation due to long-term stretching, which helps to extend the service life of the elastic reset mechanism 50.

[0061] Furthermore, the elastic return mechanism 50, configured as a spring-type elastic tension spring as described previously, can generate good elastic force, allowing the pressure head 10 to fully return to its top dead center position under the elastic force of the elastic return mechanism 50 after the pressing force applied to it is removed. For example, the upper ring 52 of the elastic return mechanism 50 is fixed to the top of the cylinder 31 by providing a fixing protrusion 33 on the top of the cylinder 31. This fixed position allows for convenient installation of the elastic return mechanism 50 into the cylinder 31, and also allows for sufficient stretching of the elastic bar 51 during operation, accumulating sufficient tension in the elastic bar 51 to ensure that the pressure head 10 returns to its top dead center position.

[0062] The preferred embodiments of this application have been described in detail above. Various obvious modifications, variations, and recombinations of various optional structures made by those skilled in the art based on the disclosed structures are also within the scope of this application.

Claims

1. A lower-position lock head pressing pump, the lower-position lock head pressing pump comprising a fixed part and a movable part, and further comprising an elastic reset mechanism formed as an elastic tension spring, wherein the elastic reset mechanism is disposed between the fixed part and the movable part. It is characterized in that The lower lock cylinder pressing pump also includes a lock cylinder switching mechanism. The lock cylinder switching mechanism is disposed on the movable part and connected to the elastic reset mechanism. It is capable of moving relative to the movable part between a first position and a second position. In the first position, the lock cylinder switching mechanism sets the elastic reset mechanism to an unstretched or slightly stretched state. In the second position, the lock cylinder switching mechanism sets the elastic reset mechanism to a pre-stretched state.

2. The lower-position lock head press pump as described in claim 1, characterized in that, The movable part includes a pressure head and a piston rod disposed below the pressure head. The fixed part includes a toothed sleeve and a cylinder assembly fixedly connected to the toothed sleeve. The lock switch mechanism is sleeved on the piston rod. One end of the elastic reset mechanism is fixedly fitted to the cylinder assembly, and the other end of the elastic reset mechanism is fitted to the lock switch mechanism.

3. The lower-position lock head press pump as described in claim 2, characterized in that, The lock switching mechanism is configured to move between the first position and the second position by rotating the pressure head.

4. The lower-position lock head press pump as described in claim 3, characterized in that, The piston rod has a spiral guide protrusion on its outer circumference, and the lock switching mechanism has a guide groove inside, which can cooperate with the guide protrusion.

5. The lower-position lock head press pump as described in claim 2, characterized in that, The cylinder assembly includes a cylinder and a cylinder plug. The cylinder plug is fixedly connected to the dental brace. A plurality of fixed protrusions are arranged circumferentially on the upper inner surface of the cylinder. One end of the elastic reset mechanism is fixed to the fixed protrusions.

6. The lower-position lock head press pump as described in claim 5, characterized in that, The elastic reset mechanism includes at least one elastic strip, an upper ring, and a lower ring, wherein the upper end of the elastic strip is connected to the upper ring, and the lower end of the elastic strip is connected to the lower ring. A gap is formed between two adjacent fixed protrusions. During installation, the upper ring is fixed to the fixed protrusion, and the elastic strip fits into the gap.

7. The lower-position lock head pressing pump as described in claim 2 or 5, characterized in that, A support protrusion is formed on the outer peripheral surface of the lock switching mechanism, and the other end of the elastic reset mechanism cooperates with the support protrusion.

8. The lower-position lock head press pump as described in claim 1, characterized in that, The elastic reset mechanism is configured to rotate relative to the movable part.

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