JP5781738B2 - Discharge pump - Google Patents

Description

  The present invention relates to a discharge pump.

  Conventionally, for example, as shown in Patent Document 1 below, a cylinder disposed in a container containing contents, a coil spring disposed in the cylinder, and an upward biased state by the coil spring A stem that is allowed to stand above the cylinder, a piston that is linked to the stem and is slidably arranged in the cylinder, and is attached to the upper end of the stem and communicates with the stem 2. Description of the Related Art A discharge pump is known that includes a pressing head on which a nozzle for forming the nozzle is formed.

No. 8-6789

  However, in the conventional discharge pump, when the pressing head rotates about the pump shaft together with the stem with respect to the cylinder, the outer peripheral edge portion of the end surface of the metal wire forming the coil spring sandwiches the coil spring in the vertical direction. There was a risk of biting into the members and scraping these members.

  The present invention has been made in consideration of such circumstances, and provides a discharge pump capable of suppressing the member that sandwiches the coil spring in the vertical direction from being scraped by the metal wire forming the coil spring. For the purpose.

In order to solve the above-described problems and achieve such an object, a discharge pump of the present invention includes a cylinder disposed in a container containing contents, a coil spring disposed in the cylinder, A stem that can be pushed in an upward biased state by the coil spring and stands above the cylinder, a piston that is linked to the stem and is slidable in the vertical direction within the cylinder, and an upper end portion of the stem And a push-down head formed with a nozzle communicating with the inside of the stem, wherein the push-down head and the stem are rotatably arranged around the pump axis with respect to the cylinder And at least one of both end faces of the metal wire forming the coil spring is directed to the center axis of the metal wire so as to face the outside in the pump axis direction. And obliquely, the coil spring is not sandwiched pump axis direction by gripping members, a state where the press head is positioned at the upper end position, and in both of a state where the press head is located at the push-end position, Of the end faces of the metal wire, the outer end edge in the pump axis direction at the outer peripheral edge thereof is disposed on the sandwiching member, and the end face of the metal wire is coiled around the pump axis. gradually toward the outside from the inside of the winding direction of wound, vertical gap between said pinching members characterized that you have increased.

  According to the present invention, at least one of the both end faces of the metal wire is inclined with respect to the central axis of the metal wire so as to face the outside in the pump axis direction. When the pressing head rotates around the pump shaft together with the stem with respect to the cylinder by making the outer end edge in the pump shaft direction located on the sandwiching member that sandwiches the coil spring vertically in the peripheral portion, The outer end edge of the end face of the metal wire can be easily slid on the sandwiching member to make it difficult to bite, and the sandwiching member can be prevented from being scraped.

  Here, the both end surfaces of the metal wire may be inclined with respect to the central axis of the metal wire so as to face the outside in the pump axis direction.

  In this case, since the both end faces of the metal wire are inclined as described above, it is not necessary to align the coil spring in the vertical direction when assembling the discharge pump. Can be prevented.

  A holding member that is screwed to hold the pressing head at a pushing end position; and in a top view of the discharge pump, a loosening direction of the pressing head about the holding shaft with respect to the holding member; The winding direction in which the metal wire is wound around the pump shaft in a coil shape may coincide with the direction from above to below.

  In this case, in the top view of the discharge pump, the loosening direction and the direction from the upper side to the lower side of the winding direction of the metal wire coincide with each other, so the pressing head is held before using the contents. When the pressing head is rotated in the loosening direction with respect to the holding member so as to be screwed off from the member, the pressing head is positioned at the pressing end position, and both end faces of the metal wire are in strong contact with the sandwiching member. In particular, the occurrence of the bite can be surely suppressed even though the above-mentioned bite is likely to occur.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the member which pinches | interposes this coil spring to an up-down direction by the metal wire which forms a coil spring is scraped.

It is a principal part section side view of a discharge pump shown as one embodiment concerning the present invention. FIG. 2 is a cross-sectional side view of a main part showing a state in which a pressing head is screwed to a holding member in the discharge pump of FIG. 1. It is a partial enlarged view of the discharge pump shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the discharge pump 1 according to the present embodiment includes a cylinder 11 disposed in a container that contains contents, a coil spring 12 disposed in the cylinder 11, and a coil spring 12. A stem 13 that can be pushed in an upward biased state and stands up above the cylinder 11, a piston 14 that is linked to the stem 13 and is slidable in the cylinder 11, and is mounted on the upper end of the stem 13. And a pressing head 15 in which a nozzle communicating with the inside of the stem 13 is formed.

  Here, in this embodiment, the cylinder 11, the coil spring 12, the stem 13, the piston 14, and the pressing head 15 are each formed in a cylindrical shape, and these 11 to 15 are arranged coaxially with the common shaft. Hereinafter, this common shaft is referred to as the pump shaft O, along the direction of the pump shaft O, the pressing head 15 side is referred to as the upper side, the cylinder 11 side is referred to as the lower side, and the direction orthogonal to the pump shaft O is referred to as the radial direction. The direction that circulates around the pump shaft O is referred to as the circumferential direction.

  In the example shown in the figure, the discharge pump 1 is provided with a cap-shaped mounting cap 17 disposed coaxially with the pump shaft O, and the mounting cap 17 is fixed to the container by being screwed into the mouth of the container. Has been.

  At the upper part of the cylinder 11, a flange portion 18 protrudes radially outward over the entire circumference, and an annular packing 19 that is close to the flange portion 18 from the lower side is fitted. These flange portion 18 and packing 19 are sandwiched in the vertical direction by the top wall portion 17a of the mounting cap 17 and the upper end opening edge of the mouth portion of the container in a state where the discharge pump 1 is fixed to the container by the mounting cap 17. . An upper end portion 11 a located above the flange portion 18 in the cylinder 11 protrudes upward through the top wall portion 17 a of the mounting cap 17. Further, an air hole 11 b that communicates the inside and the outside of the cylinder 11 is formed in a portion of the cylinder 11 that is located inside the mounting cap 17 and below the packing 19.

  The lower portion of the cylinder 11 is formed in a multistage cylindrical shape that is gradually reduced in diameter as it goes downward. A suction pipe 20 is fitted into the lower end opening of the cylinder 11 and extends downward. A cylindrical valve seat 21 that gradually decreases in diameter as it goes downward is projected from the lower end of the cylinder 11, and a spherical valve 22 is seated on the valve seat 21 so as to be separable. By the valve seat 21 and the spherical valve 22, communication between the accommodation chamber 11 c located between the piston guide 27 and the valve seat 21, which will be described later, and the inside of the suction pipe 20 in the cylinder 11 is switched. Furthermore, in the lower part of the cylinder 11, an annular receiving surface 23 that extends along the circumferential direction and supports the lower end of the coil spring 12 is formed inward in the radial direction at a portion located above the valve seat 21. Protrusively toward.

Here, a holding member 24 is provided on the upper portion of the cylinder 11 to hold the pressing head 15 in a pushing end position as shown in FIG.
The holding member 24 is formed in a cylindrical shape, and an inner cylinder 24 a fitted in the upper portion of the cylinder 11, and an outer cylinder that surrounds the inner cylinder 24 a from the outside in the radial direction and is fitted on the upper end portion 11 a of the cylinder 11. 24b, and an internal thread portion to which the pressing head 15 is screwed is formed at the upper end portion of the inner cylinder 24a.

The piston 14 includes a base tube portion 25 and an arcuate slide tube portion 26 that opens outward in the radial direction in a longitudinal sectional view along the pump shaft O, and the inner peripheral surface of the slide tube portion 26. The center part of the up-down direction in and the center part of the up-down direction in the outer peripheral surface of the base cylinder part 25 are connected. In addition, the piston 14 is arrange | positioned so that the part located in the cylinder 11 below the said air hole 11b may slide up and down.
The stem 13 is inserted into the inner cylinder 24a of the holding member 24 so as to be movable up and down. The lower end edge of the stem 13 is opposed to the upper end edge of the base tube portion 25 of the piston 14 from above with a gap in the vertical direction. When the stem 13 is lowered, the lower end edge is the base tube portion 25 of the piston 14. Is pushed downward.

In the illustrated example, a piston guide 27 is connected to the lower end portion of the stem 13. The piston guide 27 includes a cylindrical body portion 27a, a connecting cylinder portion 27b that extends upward on the top wall portion of the body portion 27a and has an upper end portion fitted into the lower end portion of the stem 13, A plurality of support protrusions 27c are provided on the peripheral wall portion of the main body portion 27a so as to protrude outwardly in the radial direction at intervals in the circumferential direction.
A first communication hole 27d penetrating in the radial direction is formed at the lower end of the connecting cylinder portion 27b.
The plurality of support protrusions 27c are fitted in the cylinder 11 so as to be slidable up and down.
A chamfered portion 27f is formed over the entire periphery of the connecting portion between the top wall portion and the peripheral wall portion of the main body portion 27a, and the lower end portion of the base tube portion 25 of the piston 14 comes into contact with and separates from the first portion. The one communication hole 27d and the gap between the support protrusions 27c adjacent in the circumferential direction are blocked and communicated.

  The pressing head 15 is formed in a cylindrical shape with a mounting cylinder portion 28 projecting downward from the top wall portion 15a and a nozzle cylinder 29 extending radially outward from the peripheral wall portion 15b. Projected. The mounting cylinder portion 28 is externally fitted to the upper end portion of the stem 13 and communicates with the inside of the stem 13, and includes a male screw portion that is screwed to a female screw portion formed at the upper end portion of the inner cylinder 24 a of the holding member 24. ing. The nozzle tube 29 communicates with the inside of the mounting tube portion 28, and a nozzle is formed at the tip to discharge the contents.

  The coil spring 12 has an upper end portion disposed in the main body portion 27a of the piston guide 27 and supported from the outside in the radial direction, and a lower end portion radially extending from the upper surface to the receiving surface 23 on the inner peripheral surface of the cylinder 11. It is supported from the outside and disposed in the cylinder 11. The coil spring 12 is sandwiched in the vertical direction by the top wall portion of the main body portion 27a of the piston guide 27 and the receiving surface 23 of the cylinder 11, so that the piston guide 27 can be pushed in from the lower side in an upward biased state. I support it.

  In the present embodiment, as shown in FIG. 3, both end faces 12a and 12b of the metal wire forming the coil spring 12 are respectively aligned with the central axis L of the metal wire so that they face the outside in the direction of the pump shaft O. It is inclined with respect to it. That is, the upper end surface 12a of the metal wire is directed upward, and the lower end surface 12b of the metal wire is directed downward. In the illustrated example, the upper end surface 12a of the metal wire is directed obliquely upward facing the outside in the winding direction in which the metal wire is wound around the pump shaft O, and the lower end surface 12b of the metal wire is It faces diagonally downward facing the outside in the winding direction.

Further, the both end faces 12a and 12b of the metal wire gradually increase in the vertical gap with the member sandwiching the coil spring 12 in the vertical direction as it goes from the inside to the outside in the winding direction. That is, the upper end surface 12a of the metal wire gradually increases away from the top wall portion of the main body portion 27a of the piston guide 27 gradually from the inner side to the outer side in the winding direction, and the lower end surface 12b of the metal wire rod is The distance from the inner side to the outer side in the winding direction gradually increases from the receiving surface 23 of the cylinder 11 upward.
In addition, inclination | tilt angle (theta) with respect to the central axis L of a metal wire of each of both end surface 12a, 12b of a metal wire is about 20 degrees-70 degrees, for example. Further, the end surfaces 12a and 12b of the metal wire are inclined as described above, with the end portions being cut, for example.

Here, in the present embodiment, the external thread portion of the mounting cylinder portion 28 of the pressing head 15 and the internal thread portion of the inner cylinder 24 a of the holding member 24 are arranged so that the pressing head 15 is moved around the pump axis O with respect to the holding member 24. The pressing head 15 is screwed in a direction in which the pressing head 15 is screwed off from the holding member 24 when rotated counterclockwise.
On the other hand, the direction from the upper side to the lower side of the winding direction of the metal wire is counterclockwise when viewed from the top of the discharge pump 1, and the loosening direction along the pump shaft O with respect to the holding member 24 of the pressing head 15 Is consistent with

  Next, the operation of the discharge pump 1 configured as described above will be described.

  First, as shown in FIG. 2, the pressing head 15 is discharged around the pump shaft O with respect to the holding member 24 from the state in which the mounting cylinder portion 28 of the pressing head 15 is screwed to the inner cylinder 24a of the holding member 24. When the pump 1 is rotated counterclockwise as viewed from above and the screwing of the pressing head 15 to the holding member 24 is released, the pressing head 15 is moved by the upward biasing force of the coil spring 12 so that the piston guide 27, the piston 14 and the stem are pressed. Ascends with 13. At this time, the piston 14 is lifted by the lower end of the base tube portion 25 being pushed up by the chamfered portion 27 f of the main body portion 27 a of the piston guide 27. As a result, the piston 14 rises in a state where the communication between the first communication hole 27d of the connection cylinder portion 27b in the piston guide 27 and the gap between the support protrusions 27c adjacent in the circumferential direction is blocked. The inside of the storage chamber 11c of the cylinder 11 becomes negative pressure, and the spherical valve 22 rises and separates from the valve seat 21, whereby the contents in the container flow into the storage chamber 11c through the suction pipe 20.

  Thereafter, when the pressing head 15 is pressed down, the stem 13 and the piston guide 27 are also lowered, and the chamfered portion 27f of the piston guide 27 is separated downward from the lower end of the base tube portion 25 of the piston 14 so that the connecting tube portion of the piston guide 27 is connected. The first communication hole 27d of 27b communicates with the gap between the support protrusions 27c adjacent in the circumferential direction. Then, the lower end edge of the stem 13 reaches the upper end edge of the base cylinder portion 25 of the piston 14, the piston 14 is pushed downward by the stem 13, and the internal pressure of the storage chamber 11 c of the cylinder 11 rises. The contents in the storage chamber 11c are discharged from the nozzle through the gap between the support protrusions 27c adjacent in the circumferential direction, the first communication hole 27d, the connection cylinder portion 27b of the piston guide 27, and the stem 13. .

As described above, according to the discharge pump 1 according to the present embodiment, the center of the metal wire is such that both end faces 12a, 12b of the metal wire forming the coil spring 12 face the outside in the direction of the pump axis O. Since it is inclined with respect to the axis L, of the outer peripheral edge portions of the end faces 12a and 12b of the metal wire rod, the top wall portion of the body portion 27a of the piston guide 27 that sandwiches the coil spring 12 in the vertical direction, and the receiving of the cylinder 11 The outer edges 12c and 12d in the direction of the pump shaft O located on the surface 23 (hereinafter referred to as the sandwiching member) can be made to have an obtuse angle.
Therefore, when the pressing head 15 rotates around the pump axis O together with the stem 13 and the piston guide 27 with respect to the cylinder 11, the outer end edges 12c and 12d on the end faces 12a and 12b of the metal wire are placed on the sandwiching member. It becomes possible to make it easy to slide and to make it difficult to bite, and to prevent the pinching member from being scraped.

  Furthermore, in this embodiment, since both the end surfaces 12a and 12b of the metal wire are inclined as described above, the vertical direction of the coil spring 12 does not have to be adjusted when the discharge pump 1 is assembled. Therefore, it is possible to prevent the manufacturing efficiency of the discharge pump 1 from being lowered.

  Moreover, in the top view of the discharge pump 1, the loosening direction along the pump axis O with respect to the holding member 24 of the pressing head 15 coincides with the direction from the upper side to the lower side in the winding direction of the metal wire. Therefore, when the pressing head 15 is rotated in the loosening direction with respect to the holding member 24 in order to unscrew the pressing head 15 from the holding member 24 prior to use of the contents, the pressing head 15 is brought into the pushing end position. In combination with the fact that both end faces 12a and 12b of the metal wire are in strong contact with the sandwiching member, this biting is particularly likely to occur. Generation can be reliably suppressed.

Furthermore, in this embodiment, since the inclination angle θ of each end face 12a, 12b of the metal wire with respect to the central axis L of the metal wire is about 20 ° to 70 °, the discharge pump 1 having the above-described effects. Can be easily formed.
That is, when the inclination angle θ is smaller than 20 °, it is difficult to manufacture the coil spring 12, and when the inclination angle θ is larger than 70 °, it is difficult to achieve the above-described effects.
In addition, since the end surfaces 12a and 12b of the metal wire are inclined as described above by cutting the end portions of the metal wire, the coil spring 12 can be easily formed.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, the discharge pump 1 is not limited to the above-described embodiment, and may be modified as appropriate, such as a so-called former pump. In addition, by disposing a so-called poppet valve in place of the piston guide 27, the discharge pump 1 is disposed below the piston 14 in the cylinder 11. And the suction pipe 20 are always in communication with each other, and the piston 14 is brought into contact with and separated from the poppet valve as the pressing head 15, the stem 13, and the piston 14 are raised and lowered. A configuration may be adopted in which the communication between the portion and the inside of the stem 13 is switched and the valve seat 21 and the spherical valve 22 are disposed in the upper portion of the stem 13.

Moreover, in the said embodiment, although both the end surfaces 12a and 12b of the metal wire were respectively inclined as mentioned above, you may incline only any one.
Furthermore, in a top view of the discharge pump 1, the loosening direction along the pump axis O with respect to the holding member 24 of the pressing head 15 and the direction from the upper side to the lower side in the winding direction of the metal wire are opposite to each other. There may be.
Moreover, in the said embodiment, although the top wall part of the main-body part 27a of the piston guide 27 and the receiving surface 23 of the cylinder 11 were shown as a clamping member which clamps the coil spring 12 to an up-down direction, it does not restrict to this but changes suitably. May be.
Further, as a means for inclining the end faces 12a and 12b of the metal wire as described above, the end of the metal wire may be polished, for example.
The outer end edges 12c and 12d of the metal wire may be chamfered, for example, in an inclined surface or a curved surface, and the end surfaces 12a and 12b of the metal wire may be chamfered from the inside to the outside in the winding direction. You may make it incline so that it may go to inner side from the outer side of radial direction gradually as it goes to.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

  The metal wire forming the coil spring can prevent the member that sandwiches the coil spring in the vertical direction from being cut.

DESCRIPTION OF SYMBOLS 1 Discharge pump 11 Cylinder 12 Coil spring 12a Upper end surface of metal wire 12b Lower end surface of metal wire 13 Stem 14 Piston 15 Pressing head 24 Holding member L Center axis O Pump shaft

Claims (3)

A cylinder arranged in a container containing the contents;
A coil spring disposed in the cylinder;
A stem that can be pushed in an upward biased state by the coil spring and stands above the cylinder;
A piston linked to the stem and slidably arranged in the cylinder;
A pressing head attached to the upper end of the stem and having a nozzle communicating with the stem;
A discharge pump comprising:
The pressing head and the stem are disposed so as to be rotatable around a pump shaft with respect to the cylinder,
At least one of both end faces of the metal wire forming the coil spring is inclined with respect to the central axis of the metal wire so as to face the outside in the pump axis direction,
The coil spring is sandwiched in the pump shaft direction by a sandwiching member,
In both the state where the pressing head is positioned at the rising end position and the state where the pressing head is positioned at the pressing end position,
Of the end face of the metal wire, the outer end edge in the pump axial direction at the outer peripheral edge thereof is disposed on the sandwiching member ,
The end surface of the metal wire is that you have progressively vertical gap between the gripping members is increased toward the outside from the inside of the winding direction in which the metal wire is wound in a coil shape to the pump axis Discharge pump characterized. The discharge pump according to claim 1,
A discharge pump characterized in that both end faces of the metal wire are inclined with respect to the central axis of the metal wire so as to face the outside in the pump axis direction. The discharge pump according to claim 1 or 2,
A holding member for holding the pressing head at a pushing end position by screwing the pressing head;
In the top view of the discharge pump, the lowering head extends downward from the loosening direction along the pump shaft with respect to the holding member and the winding direction in which the metal wire is wound around the pump shaft in a coil shape. A discharge pump characterized in that the direction coincides.

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