Pump-type dispensing vessel

Abstract

To provide an airless pump-type dispensing container that can suppress the rise in pressure inside the container body and prevent the contents from spraying out of the discharge port during use, even when containing and holding contents that include volatile components. [Solution] The container comprises a container body 1 having a filling space for filling contents, a pressing head 2 attached to the neck portion 12 of the container body 1 and which operates a pump mechanism 22 suspended and held within the neck portion 12 by repeatedly pressing the head body 23 to discharge the contents filled in the filling space M through a nozzle 26, and a middle tray 3 slidably positioned in the filling space M of the container body 1 and which slides to reduce the filling space M as the contents filled in the filling space M are discharged, wherein the middle tray 3 is held in place by its main body portion so as to be movable up and down and has a piston 4 that lowers the pressure in the filling space M by the amount of the lowering as the pressure in the filling space M rises.

Description

Technical Field

[0001] The present invention relates to an airless type pump discharge container that includes an inner dish disposed in the filling space of a container body, and enables the discharge of contents without performing air replacement when the inner dish rises.

[0002] As disclosed in Patent Document 1, when a pump attached to the mouth-neck part of a container body is driven to discharge the contents in the container body, the inside of the container body is depressurized due to the discharge of the contents, and an inner dish provided in the container body rises by the volume of the discharged contents, thereby preventing air from flowing into the container body when the contents are discharged. An airless type discharge container is known. Such an airless type discharge container has advantages such as preventing quality deterioration due to contamination or oxidation of the contents because air replacement is not performed inside the container body when the contents are discharged. In recent years, it has been widely used as a container for high-grade cosmetics.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the airless type discharge container as described above, since the inside of the container body is sealed, if the contents contain volatile components such as alcohol, the components gradually volatilize and the pressure inside the container body increases. When trying to discharge the contents, there is room for improvement in that the contents spurt out from the discharge port.

[0005] Therefore, the present invention aims to provide an airless pump-type dispensing container that can suppress the rise in pressure inside the container body and prevent the contents from being ejected from the discharge port during use, even when the container holds contents containing volatile components. [Means for solving the problem]

[0006] The pump-type dispensing container of the present invention, developed to achieve the above objective, comprises: a container body having a filling space for filling contents; a pressing head attached to the neck of the container body, which activates a pump mechanism suspended and held within the neck by repeatedly pressing the head body to discharge the contents filled in the filling space through a nozzle; and a middle tray slidably positioned within the filling space of the container body, which slides to reduce the filling space as the contents filled in the filling space are discharged, wherein the middle tray is held in place by its main body so as to be movable up and down, and has a piston that lowers the pressure in the filling space by the amount of the lowering as the pressure in the filling space rises.

[0007] In the pump-type discharge container of the present invention, the inner tray comprises an outer cylinder that is slidable along the inner circumferential surface of the container body, a top wall that has an opening that is open toward the suction portion of the pump mechanism and is connected to the upper end of the outer cylinder, and an inner cylinder that is suspended and held along the opening of the top wall and holds the piston inside so that it can move up and down, and it is preferable that the inner cylinder has an insertion space into which at least the suction portion of the pump mechanism can be inserted inside through the opening of the top wall when the piston is in a lowered position.

[0008] Furthermore, in the pump-type discharge container of the present invention, it is preferable that a gap-forming means is provided on at least one of the upper surface of the piston and the suction portion of the pump mechanism, which forms a gap between the tip of the suction portion and the upper surface of the piston.

[0009] Furthermore, in the pump-type discharge container of the present invention, it is preferable that the inner tray has an outer cylindrical portion that can slide along the inner circumferential surface of the container body and an inner cylindrical portion connected to the outer cylindrical portion, and the piston is held in place by the inner cylindrical portion so as to be movable up and down, and is a cylindrical body into which at least the suction portion of the pump mechanism can be inserted into its inner space through an opening that is open toward the pump mechanism.

[0010] Furthermore, in the pump-type discharge container of the present invention, it is preferable that at least one of the bottom wall portion of the cylindrical body and the suction portion of the pump mechanism is provided with a gap-forming means that forms a gap between the tip portion of the suction portion and the bottom wall portion of the cylindrical body. [Effects of the Invention]

[0011] According to the pump-type discharge container of the present invention, as the internal pressure of the container body increases, a piston provided in the inner tray descends, and the increase in internal volume due to this descent can reduce the internal pressure of the container body. Therefore, even if the contents contain volatile components such as alcohol, the increase in pressure inside the container body can be suppressed, and when the contents are discharged, the contents cannot be prevented from spraying out of the discharge port. [Brief explanation of the drawing]

[0012] [Figure 1] This figure schematically shows an embodiment of a pump-type discharge container according to the present invention, where (a) is a plan view, (b) is a cross-sectional view of (a) AA, and (c) is a cross-sectional view of (b) BB. [Figure 2] In the pump-type dispensing container shown in Figure 1, (a) schematically illustrates the state during flow and when the contents are being dispensed, and (b) schematically illustrates the state when the internal pressure of the container body increases. [Figure 3] In the pump-type dispensing container shown in Figure 1, (a) schematically represents a state where the contents are almost completely gone, and (b) schematically represents a state where the contents have been used up. [Figure 4]This figure schematically shows another embodiment of a pump-type dispensing container according to the present invention, where (a) shows the state during flow and when the contents are being dispensed, and (b) shows the state when the internal pressure of the container body increases. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described based on the drawings. Figure 1 is a schematic diagram showing an embodiment of a pump-type dispensing container according to the present invention, where (a) is a plan view, (b) is a cross-sectional view AA of (a), and (c) is a cross-sectional view BB of (b). Figure 2 shows the pump-type dispensing container of Figure 1, where (a) is a schematic diagram showing the state during flow and when the contents are being dispensed, and (b) is a schematic diagram showing the state when the internal pressure of the container body has increased. Figure 3 shows the pump-type dispensing container of Figure 1, where (a) is a schematic diagram showing the state when the contents in the container body have almost been used up, and (b) is a schematic diagram showing the state when the contents have been used up.

[0014] In Figures 1(a) and (b), reference numeral 1 denotes a cylindrical container body having a filling space M for filling contents inside. Reference numeral 2 denotes a pressing head detachably attached to the neck portion 12 of the container body 1. Reference numeral 3 denotes an inner tray slidably positioned within the filling space M of the container body 1, which slides upward to reduce the filling space M as the contents filled in the filling space M are discharged. Reference numeral 4 denotes a piston positioned inside the inner tray 3 and slidably provided along the inner circumferential surface 33a of the inner cylindrical portion 33 of the inner tray 3. Reference numeral 5 denotes a skirt member provided at the lower part of the body portion 11 of the container body 1, which holds the pump-type discharge container in an upright position.

[0015] The container body 1 has a cylindrical body portion 11 and a cylindrical neck portion 12 provided at the upper end of the body portion 11. In this embodiment, the body portion 11 is shown as an example of being cylindrical, but it is not limited to this, and the shape of the body portion 11 can be changed as appropriate. In this embodiment, the neck portion 12 has a male screw 12a on its outer surface, and the base cap 21 of the pressing head 2, which will be described later, is screwed onto the male screw 12a so that the pressing head 2 can be attached detachably. Note that the pressing head 2 may be attached to the neck portion 12 using other fixing means, such as undercut fitting instead of screwing.

[0016] The pressing head 2 has a base cap 21 with a female thread 21a on its inner circumference and a cover 27 that surrounds the base cap 21 and engages with the base cap 21 in a way that prevents rotation. The pressing head 2 can be detachably attached to the container body 1 by screwing the female thread 21a of the base cap 21 onto a male thread 12a provided on the outer circumference of the neck portion 12 of the container body 1. In addition, the pressing head 2 may be attached to the container body 1 using other fixing means, such as undercut fitting, instead of screwing.

[0017] The pressing head 2 is equipped with a pump mechanism 22 that is suspended and held inside the mouth neck 12. The head body 23 is attached to the pump mechanism 22, and when the head body 23 is repeatedly pressed, a piston 24 located inside the pump mechanism 22 is driven via a hollow stem, and the contents filled in the filling space M of the container body 1 are sucked in from the suction part 25, pressurized and compressed in the cylinder, and can be discharged from the nozzle 26 (discharge hole) of the head body 23.

[0018] The pump mechanism 22 can be any configuration as long as it prevents air from being drawn in from the outside when the contents are discharged by the pressing action of the head body 23, creates negative pressure inside the container body 1 when the contents are discharged, and the inner tray 3 provided inside the container body 1 is sucked in and slides upward inside the container body 1, and is not limited to the illustrated example.

[0019] The middle plate 3 is pressed against the inner peripheral surface of the body portion 11 of the container body 1 and functions as a partition wall that divides the inside of the container body 1 into a filling space M (upper side) for the contents and a region below the middle plate 3 (lower side). The middle plate 3 includes an outer cylinder portion 31 that is slidable while being in close contact with the inner peripheral surface of the body portion 11 of the container body 1, an annular top wall portion 32 that is connected to the upper end of the outer cylinder portion 31 and has an opening 32a at the center, and an inner cylinder portion 33 that is suspended and held from the opening 32a. Note that the middle plate 3 is preferably manufactured using a material such as a flexible synthetic resin so that it can be slidably pressed against the inner peripheral surface of the body portion 11 of the container body 1.

[0020] The outer cylinder portion 31 is configured to be in close contact with the inner peripheral surface of the body portion 11 by an upper edge portion 31a and a lower edge portion 31b. The inner cylinder portion 33 has a bottom wall portion 34 at the lower end, and a piston 4 described later is provided inside the inner cylinder portion 33 so as to be slidable along the inner peripheral surface 33a. At least one opening 35 (two in the figure) that communicates the space between the bottom wall portion 34 and the piston 4 with the outside is provided in the bottom wall portion 34, and by allowing air to enter and exit through the opening 35, it is possible to enable the piston 4 to slide along the inner peripheral surface 33a of the inner cylinder portion 33.

[0021] In addition, as described above, when the middle plate 3 slides and rises inside the container body 1 as the contents are discharged and reaches the upper end portion of the container body 1, the inner cylinder portion 33 has an insertion space S into which at least the suction portion 25 of the pump mechanism 22 can be inserted through the opening 32a. Therefore, the inner diameter of the inner cylinder portion 33 is larger than the outer diameter of the piston 24 so that at least the suction portion 25 of the pump mechanism 22 can be inserted into the insertion space S.

[0022] The middle dish 3 is configured such that at the upper end position within the container body 1, the upper edge portion 31a of the outer cylinder portion 31 abuts against the inner wall surface of the shoulder portion 15 that connects the body portion 11 and the mouth-neck portion 12 of the container body 1, and the protruding portion 43 of the piston 4 described later abuts against the lower end portion of the suction portion 25. Further, at the lower position of the body portion 11 of the container body 1, the lower end portion (bottom wall portion 34) of the inner cylinder portion 33 of the middle dish 3 abuts against the upper end of the inner cylinder portion 52 of the skirt member 5 described later, thereby restricting downward movement.

[0023] The piston 4 is configured to press against the inner peripheral surface 33a of the inner cylinder portion 33 of the middle dish 3 and slide along the inner peripheral surface 33a according to the internal pressure within the container body 1. The piston 4 includes an outer cylinder portion 41 that can slide closely along the inner peripheral surface 33a of the inner cylinder portion 33 of the middle dish 3, a disk-shaped partition wall portion 42 that extends in a direction orthogonal to the container axis L and is connected to a substantially central position of the outer cylinder portion 41 in the direction of the container axis L, and a protruding portion 43 that stands upright from the upper surface of the partition wall portion 42. It is preferable that the piston 4 is manufactured using a material such as a synthetic resin having flexibility so that it can press against and slide along the inner peripheral surface 33a of the inner cylinder portion 33 of the middle dish 3.

[0024] The outer cylinder portion 41 is configured to closely contact the inner peripheral surface 33a of the inner cylinder portion 33 by the upper edge portion 41a and the lower edge portion 41b. The upward movement of the piston 4 is restricted by the engagement of the upper edge portion 41a of the outer cylinder portion 41 with a stepped portion (such as an undercut) 33b provided at the upper end of the inner peripheral surface 33a of the inner cylinder portion 33. As a result, the piston 4 is retained in the inner cylinder portion 33 without coming off.

[0025] In this embodiment, as shown in Figure 1(c), the projection 43 has a C-shape in plan view, but it is not limited to this, and the shape and number of projections 43 can be changed as appropriate. The projection 43 is a gap-forming means that, as will be described later, forms a gap between the tip of the suction part 25 and the partition wall 42 of the piston 4 when the contents decrease and the inner tray 3 rises until it contacts the suction part 25, thereby preventing the suction part 25 from being sealed by the piston 4. In addition to the projection 43, any means that can form a gap between the tip of the suction part 25 and the partition wall 42 of the piston 4 is acceptable, such as forming a recess or groove in the partition wall 42, forming a groove in the suction part 25 of the piston 4, or bringing a stepped portion formed on the suction part 25 into contact with the edge of the opening 32a of the inner tray 3.

[0026] The skirt member 5 comprises an outer cylinder portion 51, a cylindrical inner cylinder portion 52, and a bottom wall portion 53 connected to the lower end of the outer cylinder portion 51 and the lower end of the inner cylinder portion 52. The skirt member 5 is attached by undercutting an annular rib 51a provided on the inner wall surface of the outer cylinder portion 51 into an annular recess 11a provided on the lower part of the container body 11.

[0027] The bottom wall portion 53 is provided horizontally so that it can be placed in contact with the floor or the like to hold the container body 1 in an upright position. The bottom wall portion 53 has an opening 53a that connects the space between the bottom wall portion 53 and the inner tray 3 to the outside and allows outside air to be supplied to the lower part of the inner tray 3, thereby enabling the inner tray 3 to slide within the filling space M.

[0028] Furthermore, reference numeral 6 denotes an overcap that covers the pressing head 2, and is composed of a cylindrical peripheral wall portion 61 and a top wall portion 62 connected to the upper end of the peripheral wall portion 61, and is detachably attached by undercut fitting the inner circumferential surface of the peripheral wall portion 61 to the pressing head 2.

[0029] The usage state of the pump-type discharge container of this embodiment will be described below. In the pump-type discharge container with the above configuration, when the contents are discharged, the head body 23 of the pressing head 2 is pushed in, causing the contents to be discharged from the nozzle 26 (discharge hole) of the head body 23. This creates negative pressure inside the container body 1, causing the inner tray 3 to rise accordingly.

[0030] During operation, as shown in Figure 2(a), the piston 4 is located at the upper end of the inner cylinder portion 33 of the inner plate 3, and its upper edge portion 41a engages with a stepped portion 33b provided on the inner circumferential surface 33a, thereby restricting its upward movement and holding it in place.

[0031] If the contents contain volatile components such as alcohol, the contents will evaporate if stored unused for a long period of time, causing the internal pressure of the container body 1 to rise. As the internal pressure of the container body 1 rises, the piston 4, which has a smaller inner diameter than the inner tray 3 and low frictional resistance, slides downward along the inner circumferential surface 33a of the inner cylinder portion 33, as shown in Figure 2(b). This increases the internal volume of the container body 1 (filling space M), thereby lowering the internal pressure of the container body 1.

[0032] This prevents the contents from being ejected from the nozzle 26 when the head body 23 of the pressing head 2 is pressed to discharge the contents. When the head body 23 is pressed to discharge the contents, the contents are sucked in by the suction part 25, causing the piston 4 to slide upward ahead of the inner tray 3, and as shown in Figure 2(a), it is positioned at the upper end of the inner cylinder 33. In this state, the inner tray 3 rises due to the negative pressure inside the container body 1, so even if the pump-type discharge container is left unused, the piston 4, which is positioned above, slides downward, suppressing the rise in internal pressure of the container body 1.

[0033] As shown in Figure 3(a), when the contents decrease and the inner tray 3 reaches the upper position inside the container body 1 (filling space M), the tip of the projection 43 of the piston 4 comes into contact with the lower end of the suction part 25. Furthermore, as the contents are discharged, as shown in Figure 3(b), the suction part 25 is inserted into the insertion space S of the inner cylinder part 33, and the suction part 25 pushes down the lower edge 41b of the outer cylinder part 41 of the piston 4 until it comes into contact with the bottom wall 34 of the inner cylinder part 33, ending the discharge.

[0034] Figure 4 schematically shows another embodiment of the pump-type dispensing container according to the present invention, where (a) shows the state during flow and when the contents are being dispensed, and (b) shows the state when the internal pressure of the container body increases. The same parts as in the previous embodiment will be omitted from the following explanation.

[0035] In this embodiment, the pump-type discharge container consists of an inner tray 3 comprising an outer cylindrical portion 310 that slides in close contact with the inner circumferential surface of the body portion 11 of the container body 1, and an inner cylindrical portion 312 connected to the outer cylindrical portion 310 via a flange portion 311. The outer cylindrical portion 310 is configured to be in close contact with the inner circumferential surface of the body portion 11 of the container body 1 by its upper edge portion 310a and lower edge portion 310b. The inner tray 3's downward movement is restricted by the lower edge portion 310b of the outer cylindrical portion 310 contacting the inner cylindrical portion 511 of the skirt member 5, which will be described later.

[0036] The piston 4 is made up of a cylindrical body and consists of a first member 410 comprising a peripheral wall portion 411, a bottom wall portion 412 connected to the lower end edge of the peripheral wall portion 411, and a leg portion 413 suspended and held from the edge of the bottom wall portion 412, and a second member 420 comprising a peripheral wall portion 421, a top wall portion 422 connected to the upper end edge of the peripheral wall portion 421, and a flange portion 423 connected to the lower end of the peripheral wall portion 421.

[0037] The first member 410 and the second member 420 are integrated by undercut fitting the inner circumferential surface of the leg portion 413 and the outer circumferential surface of the peripheral wall portion 421. Furthermore, in the fitted state, the lower surface of the bottom wall 412 and the upper surface of the top wall portion 422 are in contact with each other.

[0038] The piston 4 has a stepped portion 410a at the upper end of the outer peripheral surface of the peripheral wall portion 411 of the first member 410. The upper edge portion 312a of the inner cylinder portion 312 of the middle plate 3 engages with the stepped portion 410a, restricting downward movement. At the same time, the lower edge portion 312b of the inner cylinder portion 312 of the middle plate 3 abuts against the upper surface of the flange portion 423 of the second member 420, restricting upward movement. Thus, the piston 4 is held in place by the inner cylinder portion 33. In this example, the case in which the piston 4 is composed of two members 410 and 420 is shown, but it can also be composed of a single member if there are no particular problems in terms of molding.

[0039] The skirt member 5 comprises an outer cylindrical portion 510, an inner cylindrical portion 511, and a bottom wall 512 connecting the lower end of the outer cylindrical portion 510 and the lower end of the inner cylindrical portion 511. The skirt member 5 is attached by undercutting an annular rib 510a provided on the inner wall surface of the outer cylindrical portion 510 into an annular recess 11a provided on the lower part of the body portion 11 of the container body 1. The inner cylindrical portion 511 is provided so as to follow the inner circumferential surface of the body portion 11 of the container body 1 when the skirt member 5 is attached to the container body 1.

[0040] The bottom wall 512 is provided horizontally so that it can be placed in contact with the floor or the like to hold the container body 1 in an upright position. The bottom wall 512 has an opening 512a that connects the space between the bottom wall 512 and the inner tray 3 to the outside and allows outside air to be supplied into the filling space M, thereby enabling the inner tray 3 to slide within the filling space M.

[0041] During operation, as shown in Figure 4(a), the piston 4 is positioned upward, and the flange portion 423 of the second member 420 engages with the lower edge portion 312a of the inner cylinder portion 312, thereby restricting upward movement and preventing it from coming loose. If the contents contain volatile components, and these components volatilize, causing the internal pressure of the filling space M in the container body 1 to rise, the piston 4 will descend to suppress the rise in internal pressure of the filling space M, as shown in Figure 4(b). This prevents the contents from being ejected from the nozzle 26 when the contents are discharged. Furthermore, when the head body 23 is pushed in to dispense the contents, the suction unit 25 sucks in the contents, causing the piston 4 to slide upward ahead of the inner tray 3. As shown in Figure 4(a), the flange 423 moves until it contacts the lower edge 312b of the inner cylinder 312. In this state, the negative pressure inside the container body 1 causes the inner tray 3 to rise. Therefore, even if the pump-type dispensing container is left unused, the piston 4, which is positioned above, slides downward, suppressing the rise in internal pressure inside the container body 1.

[0042] When discharging the contents, the head body 23 of the pressing head 2 is pressed, causing the contents in the filling space M to be discharged from the nozzle 26 (discharge hole) of the head body 23. This creates negative pressure inside the container body 1, causing the inner tray 3 to rise accordingly. By the time the contents are discharged, the inner tray 3 reaches the upper end position inside the container body 1 (filling space M). The first member 410 of the inner tray 3 has an insertion space S at the upper end position of the container body 1, through the upper end opening 411a of the peripheral wall portion 411 of the first member 410, into which at least the suction portion 25 of the pump mechanism 22 can be inserted.

[0043] Furthermore, in order to prevent the suction part 25 from being sealed by surface contact between the bottom wall portion 412 of the first member 410 and the suction part 25 of the pump mechanism 22 when the inner tray 3 reaches the upper end position inside the container body 1, gap-forming means such as protrusions, recesses, or grooves may be provided on at least one of the bottom wall portion 412 and the suction part 25 to form a gap between them. [Industrial applicability]

[0044] A pump-type dispensing container according to the present invention can be suitably used as a container for dispensing the contents of cosmetics, pharmaceuticals, chemicals, etc. [Explanation of Symbols]

[0045] 1. Container body 11 Torso 11a Recess 12. Oral and Neck Region 12a Male screw 15 Shoulder 2 Pressing head 21 Base cap 21a Female thread 22 Pump mechanism 23 Head body 24 pistons 25 Suction part 26 nozzles 27 Cover 3 medium plates 31 Outer cylinder 31a Upper edge 31b Lower edge 32 Top wall section 32a aperture 33 Inner cylinder 33a Inner surface 33b Stepped section 34 Bottom wall section 35 Open hole 4 pistons 41 Outer cylinder 41a Upper edge 41b Lower edge 42 Bulkhead 43. Protrusion 5. Hakama components 51 Outer cylinder 51a Rib 52 Inner cylinder 53 Bottom wall section 53a Open hole 6 Overcap 61 Peripheral wall section 62 Top wall section 310 Outer cylinder part 310a Upper edge 310b Lower edge 311 Flange section 312 Inner cylinder 312a Upper edge 312b Lower edge 410 First Member 410a Stepped section 411 Peripheral wall section 412 Bottom wall section 413 Legs 420 Second Member 421 Peripheral wall section 422 Top wall section 423 Guard section 510 Outer cylinder part 510a Rib 511 Inner cylinder 512 Bottom wall 512a Open hole M filling space S insertion space

Claims

1. A pump-type dispensing container comprising: a container body having a filling space for filling contents; a pressing head attached to the neck of the container body, which activates a pump mechanism suspended and held within the neck by repeatedly pressing the head body, thereby discharging the contents filled in the filling space through a nozzle; and a tray slidably positioned within the filling space of the container body, which slides to reduce the filling space as the contents filled in the filling space are discharged, The aforementioned inner tray is held in place by the main body so as to be movable up and down, and has a piston that lowers the pressure in the filling space by the amount of the downward movement as the pressure in the filling space rises.

2. The inner tray comprises an outer cylindrical portion that slides along the inner circumferential surface of the container body, a top wall portion that has an opening that opens toward the suction portion of the pump mechanism and is connected to the upper end of the outer cylindrical portion, and an inner cylindrical portion that is suspended and held along the opening of the top wall portion and holds the piston inside so that it can move up and down without coming out. The pump-type discharge container according to claim 1, characterized in that the inner cylinder portion has an insertion space that allows at least the suction portion of the pump mechanism to be inserted into the inside through the opening of the top wall portion when the piston is in a downward position.

3. The pump-type discharge container according to claim 2, characterized in that at least one of the upper surface of the piston and the suction portion of the pump mechanism is provided with a gap-forming means that forms a gap between the tip of the suction portion and the upper surface of the piston.

4. The aforementioned inner tray has an outer cylindrical portion that can slide along the inner circumferential surface of the container body, and an inner cylindrical portion connected to the outer cylindrical portion. The pump-type discharge container according to claim 1, characterized in that the piston is held in place by the inner cylinder so as to be movable up and down, and comprises a cylindrical body through an opening that is open toward the pump mechanism, into which at least the suction portion of the pump mechanism can be inserted into its inner space.

5. The pump-type discharge container according to claim 4, characterized in that at least one of the bottom wall portion of the cylindrical body and the suction portion of the pump mechanism is provided with a gap-forming means that forms a gap between the tip portion of the suction portion and the bottom wall portion of the cylindrical body.

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