JPH0726366U - Dropper container - Google Patents

Abstract

(57) [Summary] [Purpose] In a container with a dropper that automatically sucks liquid into the dropper when the cap is unscrewed, the piston sucks up the liquid and the elastic dome pushes down the liquid, and the cap is tightened. At this time, the elastic dome and the dropper are provided so that the communication between them is blocked. [Structure] Open the central portion of the first top wall 7 to the neck of the container body 8
And the cylinder 14 and the male screw cylinder 13 are erected, and the first peripheral wall 5
The dropper-equipped member 4 having the recesses 6, 6 on the left and right, and the male screw cylinder, the stopper rod 23, the cylindrical piston 24, and the elastic dome 28.
The compression members 20 having the above are respectively screwed, and the lower portion of the third peripheral wall 38 of the push button 35 is fitted to the outer surface of the second peripheral wall, and the outer cylinder 40 is fitted to the outer surfaces of the first, second, and third peripheral walls, respectively. The engagement protrusion 44 on the inner surface is engaged with the inside of the recess and the squeezing member, and the cap 3
After tightening, the outer cylinder is turned in the loosening direction, and when the engaging projection comes into contact with the end of the concave portion in the loosening direction, the lower end of the plug rod 23 is pulled out from the opening 8 and the liquid is sucked into the dropper 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dropper container used for taking out lotion or liquid medicine.

[0002]

[Prior art]

 For example, the invention of Jitsukaihei 5-10258 is known. The container is composed of a container body that erects the mouth and neck and a cap screwed to the mouth and neck, and the cap is the middle of the peripheral wall in which the lower half is screwed to the outer surface of the container mouth and neck. Section, the dropper is hung down into the container body through the inward flange that is placed on the upper end surface of the mouth and neck and protrudes, and the lower part of the elastic dome is fitted to the upper end of the dropper, and the left and right of the upper part of the peripheral wall are attached. A member with a dropper that has split grooves vertically installed on both sides, and a pin protruding outward from both left and right parts to the lower end of the cylinder hanging from the peripheral edge of the top plate is inserted into the split groove so that it can move up and down. A push button having a hanging push rod mounted on the elastic dome-shaped portion, an outer cylinder on the outer surface of the peripheral wall of the member with a dropper, and a concave portion provided on the left and right outer surfaces of the peripheral wall within a predetermined angle range. The attached engaging element can be rotated in the recess, and The push button has a tubular operation member fitted so that it cannot move up and down. A cam mechanism is provided on the outer surface of the tubular portion of the push button and the inner surface of the outer tube of the tubular operation member to provide engagement between the tubular operation member. The push button is pushed down when the mating element comes into contact with the end of the concave portion of the member with a dropper in the circumferential wall tightening direction, and the push rod of the push button pushes down and squeezes the elastic dome, and the engaging element is the end portion of the concave portion in the loosening direction. The elastic dome elastically restores to push up the push button when it comes into contact with, and the tubular operating member is rotated in the loosening direction from this state, so that the member with the dropper and the peripheral wall of the container body It is provided so that it can be screwed out of the mouth and neck. Air inside the dropper is expelled by squeezing the elastic dome-shaped part, liquid inside the container is sucked in due to its elastic restoration, and after the member with a dropper is unscrewed, the liquid inside the dropper pipe is poured by pushing down the push button. It is something to put out.

[0003]

[Problems to be solved by the device]

 The conventional dropper container described above is convenient in that the liquid inside the container can be automatically sucked into the dropper by simply removing the cap from the state where the cap with the dropper is screwed onto the neck of the container body and tightened. Since the elastic dome at the upper end of the dropper is pushed down by the push-up rod of the push button and squeezed when the cap is screwed to the neck of the body and the tightening is completed, there is a drawback that the elastic dome has large elastic fatigue. there were. Further, since the elastic dome is usually made of rubber and the elastic dome and the inside of the dropper are in communication with each other, the rubber odor may be transferred to the liquid, which is not preferable in the case of cosmetic liquid.

The present invention does not fit the elastic dome directly to the upper end of the dropper, but instead of the elastic member, the cylindrical piston is hung between the dropper member and the push button and the elastic member is attached to the upper surface of the dropper member. The tubular piston is fitted into the cylinder which is screwed with the member with the dropper and is erected from the member with the dropper, and is provided so as to be engaged with the outer cylinder. In order to prevent the elastic dome from being squeezed and elastically fatigued as in the case of the above-mentioned conventional example by inserting and pouring, the dropper and the elastic dome between the dropper and the elastic dome are tightened when the cap is tightened. It is provided so that communication is cut off and the above-mentioned odor transfer is not multiplied.

[0005]

[Means for Solving the Problems]

 It consists of a container body 1 for erecting the mouth / neck portion 2 and a cap 3 screwed onto the outer surface of the mouth / neck portion. The caps are both left and right portions of the first peripheral wall 5 screwed onto the outer surface of the mouth / neck portion. The outer surface has recesses 6 and 6 drilled in a predetermined angle range, and the central portion of the first top wall 7 that closes the upper surface of the first peripheral wall is opened 8 and a dropper 10 is hung down from the opening peripheral edge into the container body. In addition, the male screw cylinder 13 is raised from the outer peripheral portion of the first top wall, the dropper-equipped member 4 is provided to raise the cylinder 14 from the inner portion of the cylinder, and the second peripheral wall 21 is screwed to the outer surface of the male screw cylinder. A piston cylinder 25 having a cylindrical piston 24 fitted from the outer periphery of the top wall 22 into the lower end of the cylinder with a stopper rod 23 for sealing the opening 8 at the lower end from the center of the second top wall to the second top wall. The elastic dome 28 is erected by hanging from the middle in the radial direction and fixing the lower end to the outer periphery of the second top wall. A squeezing member 20 in which a vent hole 27 for communicating the inside of the dome and the inside of the piston cylinder is bored, and further engaging grooves 30, 30 are bored in both left and right portions of the outward flange 29 at the lower end of the second peripheral wall 21. Then, the third peripheral wall 38 is hung from the outer periphery of the third top wall 37 placed on the elastic dome, and the lower part of the third peripheral wall can be pushed down to the outer surface of the upper part of the second peripheral wall 21 and projecting. The push button 35 fitted so as not to be able to be pulled out by the ridge engagement and the lower inner surface of the first peripheral wall 5 are engaged with the lower inner surface of the cylindrical portion so that the entire outer surface of the first, second and third peripheral walls is cylindrical. The part 41 is rotatably fitted, and the engaging grooves 30, 30 are slidably fitted so that the lower parts of the engaging ridges 44, 44 provided vertically on the left and right parts of the tubular part 41 are recessed. When the engaging projections 44, 44 are moved to the ends of the recesses in the loosening direction, both the pressing member 20 and the push button 35 rise. Then, from the opening 8 to the stopper rod 23 Formed so that it can be extracted.

It comprises a container body 1 for erecting the mouth / neck portion 2 and a cap 3 screwed onto the outer surface of the mouth / neck portion. The cap is a lower portion of the first peripheral wall 5 screwed onto the outer surface of the mouth / neck portion. Both the left and right parts of the outer surface are set as sliding surfaces 6a, 6a within a predetermined angle range, and the remaining portions are non-sliding surfaces 6b6b, and first stoppers 51 are vertically installed at each boundary line, and the first upper surface of the peripheral wall is closed. A thin elastic seal cylinder 54 is opened from the central portion of the first top wall 22 and a dropper 10 is hung from the first top wall portion surrounding the seal cylinder into the container body. From the lower end of the upper cylinder part screwed to the outer surface of the male screw cylinder 13 and the member 4 with a dropper that stands up from the inner part of the wall and the inner part of the wall, and the cylinder 14 from the inner part of the wall. The lower tubular portion 57 is hung down via the outward flange, and the lower tubular portion is fitted to the upper outer surface of the first peripheral wall. A piston cylinder having a cylindrical piston 24 at the lower end fitted with the two peripheral walls 21 from the outer periphery of the second top wall 22, the wire rod 23 for sealing the seal cylinder 54 from the center of the second top wall, and further into the lower part of the cylinder. 25 from the middle in the radial direction of the second top wall, the lower end is fixed to the outer periphery of the second top wall to erect an elastic dome 28, and a vent hole 27 that connects the inside of the dome to the inside of the piston cylinder 25 And the third peripheral wall 38 hanging from the outer periphery of the third top wall 37 placed on the elastic dome, and can be pushed down to the outer surface of the upper part of the second peripheral wall 21, and the ridge engagement The push button 35 fitted so as not to be able to be pulled out by the above, and the lower cylindrical portion of the lower outer surface of the first peripheral wall are engaged with the lower cylindrical projection so as not to move up and down, and the outer surface of the entire first, second, and third peripheral walls is cylindrical. A second stopper 53 vertically arranged on the non-sliding surface above the lower cylinder part 57 of the second peripheral wall. At the end of the notch 59 provided in the slack direction, the engaging ridges 44, 44 are vertically fitted to the inner cylinder outer surface so as to be fitted into the split grooves 58, 58 vertically provided in the lower cylinder 57. The lower part is engaged with the side surface of the first stopper at the end in the sliding surface tightening direction, and when the engaging projections 44, 44 come into contact with the first stopper 51 at the end in the loosening direction of the sliding surface, the seal is formed. The stopper rod 23 was formed so that it could be pulled out from the cylinder 54.

[0007]

[Action]

 In the state shown in FIGS. 1 and 3, the opening 8 of the first top wall 7 of the member with a dropper or the seal cylinder 54 is closed at the lower end of the stopper rod 23 hanging from the squeezing member 20, so that the dropper 10 and the elastic dome 28 are connected. Communication is blocked. When the outer cylinder 40 is rotated in the loosening direction from this state, the compression member 20 rises and the opening 8 and the seal cylinder 54 open as shown in FIGS. Further, when the compression member rises, the cylindrical piston 24 in the cylinder rises, so that the inside of the dropper becomes negative pressure, and the liquid in the container is sucked, and the outer cylinder 40 is further capped from the state shown in FIGS. 2 and 4. When the cap is removed, the cap is removed and the elastic dome 28 is squeezed by pressing the push button 35 while the cap is removed, and the liquid in the dropper is poured out. After pouring out, screw the cap onto the neck of the container body to obtain the state shown in Figures 1 and 3.

[0008]

【Example】

 First, a first embodiment shown in FIGS. 1 and 2 will be described.

The container of the present invention comprises a container body and a cap, and the cap comprises a member with a dropper, a push button and an outer cylinder.

The container body 1 erects the mouth neck portion 2 for screwing the cap 3.

The member 4 with a dropper as a cap constituting member has concave portions 6 and 6 formed on the outer surfaces of the left and right parts of the first peripheral wall 5 screwed onto the outer surface of the neck of the container body in a predetermined angle range. Further, the central portion of the first top wall 7 that closes the upper surface of the first peripheral wall is opened, and the dropper fitting cylinder 9 is hung from the lower surface of the opening peripheral edge. The upper end of the dropper 10 vertically extending into the container is fitted to the outer surface of the fitting cylinder, and the outward flange 11 attached to the upper end of the dropper is placed on the upper end face of the neck of the container through the packing 12. The upper and lower surfaces of the mouth and neck and the lower surface of the first top wall 7 are clamped. Further, from the upper surface of the first top wall 7, a male screw cylinder 13 is erected from the inside and a cylinder 14 is erected from the inside, leaving the outer periphery of the top wall as an upward step. A groove 15 is provided around the lower end of the first peripheral wall.

The squeezing member 20 has a second peripheral wall 21 screwed onto the outer surface of the male screw cylinder from the outer periphery of the second top wall 22 and a plug rod 23 whose lower end is tightly fitted in the opening 8 as a second top wall. A piston cylinder fitting cylinder 26, in which a piston cylinder 25 standing upright through an inward flange from a cylindrical piston 24 fitted from the center to the inside of the cylinder, is fitted to the inner surface of the second top wall. From the radial middle part, hang each. Further, in the second top wall portion between the stopper rod 23 and the piston cylinder 25, a vent hole 27 which communicates the inside of the elastic dome and the inside of the piston cylinder is formed. A groove is provided around the outer periphery of the second top wall, and the lower end of the peripheral wall of the elastic dome 28 is fitted into the groove. An outward flange 29 is attached to the lower end of the second peripheral wall, engaging grooves 30, 30 are formed in both left and right portions thereof, and an engaging line 31 is provided on the outer surface of the upper end of the second peripheral wall. .

The push button 35 mounts a third top wall 37 on the elastic dome 28 via a short cylinder 36 that hangs from the lower surface of the central portion, and from the outer circumference of the third top wall to the first half of the outer diameter of the lower half. 3 Hanging down the peripheral wall 38. An engaging strip is provided on the inner surface of the lower end of the third peripheral wall so as to engage with the lower surface of the engaging strip at the upper end of the second peripheral wall so that it cannot be pulled out. Is fitted to the upper half of the outer surface of the second peripheral wall by squeezing the elastic dome, and the elastic dome is elastically restored by pushing down and releasing the push button 35 to the original position.

The outer cylinder 40 is fitted to the entire outer surface of the first, second, and third peripheral walls 5, 21, and 38, and is rotated at the inner periphery of the lower end of the cylindrical portion 41 into the aforementioned concave groove. There is an engaging ridge 42 which is fitted as much as possible, and an inward flange 43 having an inner diameter substantially the same as the outer diameter of the upper portion of the third peripheral wall of the push button is attached to the upper end of the tubular portion. Engaging projections 44, 44 are vertically provided on both left and right sides of the inner surface of the tubular portion. The lower portion of the engaging protrusion is movable in the circumferential direction in the recesses 6 and 6 described above, and contacts the end of the recess in the tightening direction in the cap tightened state shown in FIG. The above-mentioned engaging grooves 30, 30 are slidably fitted in the middle of the engaging ridges.

From the state shown in FIG. 1, when the outer cylinder 40 is turned in the loosening direction and the lower portions of the engaging protrusions 44, 44 come into contact with the loosening ends of the recesses, the pressing member 20 is screwed up and the stopper is closed. The lower end of the rod 23 is pulled out from the opening 8.

The second embodiment shown in FIGS. 3 to 7 differs from the first embodiment in the following points.

As for the member 4 with a dropper, as shown in FIG. 5, both left and right parts of the lower outer surface of the first peripheral wall 4 are slidable surfaces 6a, 6a within a predetermined angle range, and the remaining lower outer surface part is non-sliding. As the moving surfaces 6b, 6b, the first stoppers 51 having the same height are vertically provided on each boundary line. Further, a beam 52 is laterally provided between the upper ends of the first stoppers on both sides of the non-sliding surface, and second stoppers 53, 53 are vertically provided upward from the slack direction side portion of the beam. At the opening in the central portion of the first top wall, the top wall portion at the peripheral edge of the opening is thin, and a thin elastic seal cylinder 54 is hung from the peripheral edge of the opening to form a small gap with the seal cylinder. Then, drop the dropper fitting cylinder 9. Further, the male screw cylinder 13 is a double thread, and the thread thereof is narrow thread grooves 55, 55.

The compression member 20 has convex threads 56, 56 so that the threads on the inner surface of the second peripheral wall 21 can be fitted into the above-mentioned spiral groove almost tightly, and the outward facing flange from the lower end of the second peripheral wall to the first peripheral wall. A lower tubular portion 57 to be fitted to the outer surface of the upper half portion is suspended, and split grooves 58, 58 are vertically provided in the lower tubular portion in a shape in which the above-described engaging groove is provided vertically. Further, notches 59, 59 are provided on the tightening direction side of the split groove. The notch is provided so that the second stoppers 53, 53 come into contact with the loosening end of the notch 59 in the state shown in FIG. 7 in which the second peripheral wall 21 is screwed into the male screw cylinder 13 and tightened. is there. At this time, as shown in FIG. 7, the split grooves 58, 58 are located above the ends on the sliding surface tightening direction side. Further, a plurality of vertical ribs 60 are vertically provided on the upper inner surface of the piston cylinder 25, and when the piston cylinder 25 is fitted between the piston cylinder fitting cylinder 26 and the plug rod 23, the inner surface of the vertical rib is The outer surface of the stopper rod and the outer surface of the piston cylinder 25 are brought into pressure contact with the inner surface of the piston cylinder fitting cylinder 26, respectively, so that the withdrawal can be prevented. Further, on the outer surface of the upper portion of the stopper rod, a small ridge is provided around which the lower end surface of the vertical rib is engaged.

The engaging ridges 44, 44 of the outer cylinder 40 are fitted into the above-mentioned split grooves 58, 58, and in the cap tightened state shown in FIG. 3, the lower portion of the engaging ridge is the sliding surface 6a. , 6a come into contact with the first stopper 51 at the end in the tightening direction, and when the outer cylinder 40 is turned in the loosening direction from this state, the lower part of the engaging projection is the end in the sliding surface loosening direction as shown in FIG. The first stopper of the container, and at this time, the squeezing member 20 is screwed up to suck the liquid in the container into the dropper.

[0020]

[Effect of device]

 The present invention is configured as described above, and a compression member 20 that engages with the outer cylinder 40 is screwed onto the member 4 with a dropper, and a cylinder that hangs down from the compression member into a cylinder standing upright from the member 4 with a dropper. When the cylindrical piston 24 is provided so as to suck the liquid into the dropper by screwing up the compression member 20 through the outer cylinder 40, the elastic dome 28 is used when the liquid in the dropper is poured out. Therefore, as in the above-mentioned conventional example, when the cap is tightened, the push button descends and the elastic dome remains squeezed, resulting in large elastic fatigue of the elastic dome. Absent . Further, a stopper rod 23 is hung from the squeezing member 20, and the lower end of the stopper rod is provided so as to seal the opening 8 of the first top wall 7 of the member with a spitter when the cap is tightened. Communication with the inside of the elastic dome 28 of the member 20 is blocked, and there is no possibility that the odor of the elastic dome will be transferred into the container body.

In the case of claim 2, on the outer surface of the first peripheral wall of the member 4 with a dropper, the second stoppers 53, 53 which are higher than the first stopper and are vertically provided above the non-sliding surfaces 6b, 6b of the first peripheral wall, Since the notch 59 provided at the lower portion of the lower wall of the second peripheral wall 21 is engaged with the loosening end of the notch 59, when the cap is assembled, the spoiler is attached until the second stopper comes into contact with the loosening end of the notch beforehand. The second peripheral wall 21 of the pressing member is screwed into the male screw cylinder 13 of the pressing member, and then the push button 35 is fitted to the upper portion of the pressing member so that the outer cylinder 40 can be fitted. 4 is easier to assemble than the case where the pressing member 20 and the outer cylinder 40 are aligned at the same time. Further, since the thin elastic seal cylinder 54 is hung from the peripheral edge of the opening at the center of the first top wall 7 of the member with a dropper, the sealing by fitting the lower end portion of the stopper rod 23 hanging from the squeezing member 20 can be surely and easily performed. You can

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a container of the present invention shown in a cap tightened state.

FIG. 2 is a vertical cross section of the container shown in FIG. 1 in a state where liquid is sucked into the dropper.

FIG. 3 is a vertical sectional view showing a second embodiment in a cap tightened state.

FIG. 4 is a view showing a state in which the liquid is sucked into the dropper.
It is a longitudinal cross-sectional view of a container.

FIG. 5 is a perspective view of a main part of a member with a dropper, which is a main member of the second embodiment.

FIG. 6 is a perspective view of a main part of a compression member main body, which is a main member of the second embodiment.

FIG. 7 is an assembly view of each main part of the dropper member and the pressing member body shown in FIG. 5;

[Explanation of symbols]

3… Cap 4… Member with dropper 20… Squeeze member 35… Push button 40… Outer cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Nakamura Inventor Hiroyuki 3-6 Oshima, Koto-ku, Tokyo Yoshino Industry Co., Ltd. (72) Inventor Takao Kishi 3-2 Oshima Koto-ku, Tokyo Yoshiyoshi Co., Ltd. Inside the Nokogyo Plant

Claims (2)

[Scope of utility model registration request] 1. A container body 1 for erecting a mouth / neck portion 2, and a cap 3 screwed onto the outer surface of the mouth / neck portion, the cap being a first peripheral wall screwed onto the outer surface of the mouth / neck portion. 5 has concave portions 6 and 6 formed on the outer surfaces of both the left and right portions within a predetermined angle range, and has an opening 8 at the central portion of the first top wall 7 that closes the upper surface of the first peripheral wall and into the container body from the opening peripheral edge. A dropper 10 is provided vertically, and a male screw cylinder 13 is erected from the outer peripheral portion of the first top wall, and a cylinder 14 is erected from the inner portion of the cylinder. A piston cylinder 25 having a cylindrical piston 24 in which the peripheral wall 21 is fitted from the outer periphery of the second top wall 22, and the plug rod 23 for sealing the opening 8 at the lower end is fitted from the center of the second top wall into the lower end of the cylinder. From the middle in the radial direction of the second top wall, and the lower end portion is fixed to the outer peripheral portion of the second top wall to form the elastic dome 28. A ventilation hole 27 that stands up and connects the inside of the dome and the inside of the piston cylinder is formed, and further the second peripheral wall 21 is formed.
Engagement grooves 30, 30 on both left and right sides of the outward flange 29 at the lower end of
The squeezing member 20 and the third peripheral wall 38 placed on the elastic dome are suspended from the outer periphery of the squeezing member 20.
A push button 35 in which the lower part of the peripheral wall is fitted to the outer surface of the upper part of the second peripheral wall 21 so that the lower part can be pushed down and cannot be pulled out by the protrusion engagement.
The lower inner surface of the cylindrical portion is engaged with the lower outer surface of the first peripheral wall 5, and the cylindrical portion 41 is rotatably fitted to the outer surfaces of the entire first, second, and third peripheral walls, and the engagement groove 30 is formed. , 30 are slidably fitted to each other, and the lower portions of the engaging projections 44, 44 provided vertically on both the left and right sides of the tubular portion 41 are brought into contact with the end portions of the concave portions 6, 6 in the fastening direction. When the engaging ridges 44, 44 move to the slack direction ends of the recesses, both the squeezing member 20 and the push button 35 are raised so that the plug bar 23 can be pulled out from the opening 8. Characteristic dropper container. 2. A container body 1 for erecting a mouth / neck portion 2, and a cap 3 screwed onto the outer surface of the mouth / neck portion, the cap being a first peripheral wall screwed onto the outer surface of the mouth / neck portion. 5. The left and right parts of the lower outer surface are the sliding surfaces 6a, 6a within a predetermined angle range, and the remaining parts are the non-sliding surfaces 6b, 6b.
And a thin elastic seal cylinder 54 is opened from the peripheral edge of the opening of the central portion of the first top wall 22 where the upper surface of the first peripheral wall is closed, and from the first top wall portion surrounding the seal cylinder, the inside of the container Hes Dropper 10
Respectively, and further leaving the outer periphery of the first top wall, the male screw cylinder 13 from the inner part thereof, and the cylinder 14 from the inner part of the cylinder.
And a member 4 with a dropper standing upright from the lower end of the upper cylinder part screwed onto the outer surface of the male screw cylinder 13 from the lower end of the lower cylinder part 57 via an outward flange. From the outer periphery of the second top wall 22 to the second peripheral wall 21 fitted to the upper outer surface,
In addition, a wire rod 23 for sealing the seal cylinder 54 from the center of the second top wall, and a piston cylinder 25 having a cylindrical piston 24 fitted at the bottom of the cylinder at the lower end from the middle of the second top wall radial direction,
The squeeze member 20 in which the elastic dome 28 stands by fixing the lower end to the outer peripheral portion of the second top wall and piercing the ventilation hole 27 that connects the inside of the dome and the inside of the piston cylinder 25, and the elastic dome. A push button 35 that hangs the third peripheral wall 38 from the outer periphery of the third top wall 37 placed on the upper side and can be pressed downward to the outer surface of the upper portion of the second peripheral wall 21, and is fitted so as not to be pulled out by the protrusion engagement. First above
An outer cylinder 40 in which a lower cylindrical portion is engaged with a lower outer surface of the peripheral wall so as to be vertically immovable and a cylindrical portion 41 is rotatably fitted to the outer surfaces of the entire first, second, and third peripheral walls. The second stopper 53 vertically provided on the non-sliding surface is provided at the end of the notch 59 provided in the lower portion of the second peripheral wall lower tubular portion 57 in the loosening direction and vertically on the lower tubular portion 57. The engaging projections 44, 44, which are fitted in the split grooves 58, 58 and are provided vertically at the position facing the inner surface of the outer cylinder, are engaged with the first stopper side surfaces at the ends in the sliding surface tightening direction to form the sliding surface A dropper container characterized in that the stopper rod 23 can be pulled out from the seal cylinder 54 when the engaging protrusions 44, 44 come into contact with the first stopper 51 at the end in the loosening direction.