CN113859749B

CN113859749B - Quantitative suction cover structure of pipette

Info

Publication number: CN113859749B
Application number: CN202110024346.5A
Authority: CN
Inventors: 宋监燮
Original assignee: Taesung Industrial Co Ltd
Current assignee: Taesung Industrial Co Ltd
Priority date: 2020-06-30
Filing date: 2021-01-08
Publication date: 2023-07-07
Anticipated expiration: 2041-01-08
Also published as: EP3932250A1; CN113859749A; KR102359569B1; JP2022013598A; KR20220002782A

Abstract

The invention relates to a pipette quantitative suction cover. The quantitative pipette tip cap according to the present invention is applied to the present invention, and by dividing the constitution of the quantitative pipette tip cap into a mounting cap which can be selectively separated from the container body and a suction rotor which can raise and lower the suction member by rotating the outer side, the contents can be discharged and used by the suction rotor while being safely separated from the container body by the mounting cap, so that the problem of loss of the contents due to separation of the quantitative pipette tip cap from the container body when carrying and using can be fundamentally solved, and the suction mechanism for sucking and discharging the contents can be simplified and thereby the production cost thereof can be remarkably reduced while improving the productivity at the time of assembly production.

Description

Quantitative suction cover structure of pipette

Technical Field

The present invention relates to a quantitative pipette tip cap structure, and more particularly, to a quantitative pipette tip cap structure which can fundamentally solve the problem of loss of contents due to separation of a quantitative pipette tip cap from a container body when in use by separating the structure of a quantitative pipette tip cap into a mounting cap which can be selectively separated from the container body and a suction rotating body which can raise and lower a suction member by rotating the suction rotating body on the outside, and can discharge the contents by the suction rotating body while safely separating and mounting the mounting cap from the container body, and can simplify a suction mechanism for sucking and discharging the contents by the use of the quantitative pipette tip cap and thereby remarkably reduce the production cost thereof while improving productivity at the time of assembly production.

Background

In general, when cosmetic contents filled in a container are used, some types of cosmetic containers are used by pouring out the contents contained in the container body through an opening after separating the cap from the container body, and other types of cosmetic containers are used by discharging the contents using a contents discharge pump installed in the opening of the container.

Among the cosmetic contents to be discharged in such a manner, highly functional cosmetics such as essence, eye cream, anti-aging and anti-wrinkle agents are generally relatively expensive and have relatively small usage amounts, and thus quantitative discharge is required, and thus, a pipette type cosmetic container for extracting the contents and applying them to the corresponding skin by a pipette type that can achieve quantitative and small discharge has been widely developed and popularized.

A pipette (fluid) is a dispenser for moving a liquid content by sucking the content in a liquid state by a vacuum force and discharging the content to a desired position, and is widely used as a means for dispensing a test liquid, a medicine, or the like in various laboratories or medical institutions.

A pipette used for the purpose as described above has an advantage that quantitative use can be achieved while minimizing loss of contents.

As a conventional pipette-type cosmetic container to which the above pipette is applied, there is a "quantitative discharge device for liquid container" of which invention nos. 10 to 1215420 are registered in advance.

As shown in fig. 1, the preregistered invention is configured such that the contents are sucked in a constant amount through the pipette 310 by the piston 630 which is provided to the rotary body 400, the inner cap 700, and the outer cap 800 constituting the cap coupled to the container body 100 and is raised simultaneously with the rotary movement, and then the contents sucked in the pipette 310 are discharged according to the pressing operation of the button part 600 by the user at the time of use, so that a certain amount of contents can be simply discharged for use without performing a special operation.

In the pre-registration invention, the guide protrusion 220 formed on the wiper 200 mounted on the inlet 110 of the container body 100 is positioned in the spiral guide groove 410 of the rotator 400 to guide the wiper, and the guide groove 410 is formed with an opening 411 at a lower portion thereof to be coupled with the guide protrusion 220 of the wiper.

An inner cap 700 including a cylinder 720 for reciprocating a piston 630 is assembled at an outer side of the rotary body 400, an outer cap 800 is assembled at an outer side of the inner cap 700, a button part 600 receiving an elastic force of a spring 500 is assembled at an upper part of the outer cap 800, and the piston 630 assembled to be interlocked with the button part 600 is assembled inside the cylinder 720 of the inner cap 700.

When the cap 700 and the cover 800 constituting the cap are rotated in the separating direction, the horizontal portion 413 of the guide groove 410 of the rotary body 400 interlocked with the cap is separated from the guide projection 220 of the wiper 200, and the inclined portion 412 is guided by the guide projection 220, so that the cap 700, the cover 800 and the rotary body constituting the cap are lifted, and at this time, the piston assembled in the interlocked manner with the button portion 600 is lifted up by the elastic force of the spring 500 to move the piston in the cylinder 720 of the cap 700, thereby sucking the contents into the pipette 310.

After the content is sucked into the pipette 310, the pipette 310 is pulled out from the inlet 110 of the container body 100, and then the content is discharged for use by pressing the button part 600 in a state where the discharge port of the pipette 310 is moved to a position where the content is required to be used.

The above-mentioned "quantitative discharging device for liquid container" of the pre-registered invention is constituted by a rotary body alone in addition to the inner lid and the outer lid constituting the lid, and has a problem that the assembling productivity cannot be improved in the assembling process because of its complicated structure, and there is a high possibility that the lid is easily separated from the container body and the expensive content is lost in the case of non-dressing use, i.e., carrying use, because the structure of maintaining the horizontal portion of the guide groove in the coupling state of the guide projection of the wiper is adopted as a means of fixing the lid to the container body.

Disclosure of Invention

The present invention has been made to solve the problems of the previously registered inventions, and an object thereof is to provide a pipette quantitative suction cap structure which realizes a rotation-free lifting movement by reciprocating a piston constituting a suction part inside a cylinder of a cylinder part and guiding a guide projection of a piston driving part for driving the piston to reciprocate by a guide hole formed in an extension part of a mounting cap, and which is capable of positioning the piston driving part at a position receiving an elastic force of a spring and positioning the guide projection of the piston driving part at a position regulated by a suction inclined surface formed on an inner side surface of a suction rotary body, whereby the guide projection of the piston driving member is selectively sucked into the cylinder in a state of an upper level and a lower level of the suction inclined surface of the suction rotary body by means of rotation of the suction rotary body mounted in a manner that the suction rotary body can be idly rotated, and the contents sucked into the cylinder are discharged by means of the action of the discharge cap, the contents can be stably sucked and discharged by the suction cap by improving the structure in which the lifting action of the suction cap and the separation use of the container body can be respectively performed, and the problems existing in the quantitative discharge device for a liquid container of the pre-registered invention in which the high-price contents are lost due to the easy separation of the suction cap from the main container in the case of carrying use can be solved by stably locking to or separating from the container body by means of the mounting cap screw-coupled to the opening of the container body by the suction cap, but also can significantly reduce the production cost and further significantly reduce the economic burden of consumers by simplifying the number of parts constituting the suction cap and improving productivity in the assembly production process.

In order to achieve the above object, the present invention includes: a mounting cap having a coupling screw formed on an inner circumferential surface thereof for screw-coupling to a screw formed in an opening of a container body for storing contents, and having a cylinder member coupling annular frame formed on an inner side surface thereof and assembled with a fixing flange of the cylinder member while allowing a center gas cylinder member to pass through, wherein a guide groove for guiding a guide projection of a suction member mounted so as to be interlocked with a discharge cap is formed in a rectangular divided manner in an extension portion formed extending upward from the cylinder member coupling annular frame as a starting point;

a cylinder part, the cylinder penetrating the cylinder part of the mounting cover is combined with the annular frame to form a fixed flange with undercut fixed, and a pipette assembling pipe penetrating the cylinder is formed at the lower part of the fixed flange in an extending way;

a pipette penetrating through a pipette assembling pipe assembled to the cylinder member and positioned at a position where the contents stored in the container main body can be sucked, and assembled by the assembling member in a state of being positioned inside the cylinder;

a suction part protruding in four directions to form a guide protrusion guided by a guide groove formed in the extension part of the mounting cover, a piston performing vacuum reciprocating movement in the cylinder being assembled to a pin formed at the center of the recess part;

a suction rotator which is sleeved on the outer side surface of the mounting cover, a blocking annular frame formed on the inner side of the lower part is blocked by the blocking annular frame, so that the suction rotator can be assembled in an idle mode, a suction inclined surface which can press or release the pressing state of a guide protrusion guided by a guide groove of an extension part of the mounting cover while being under the elastic force of a spring is formed on the upper quarter of the inner peripheral surface, and an annular frame with the inner diameter corresponding to the outer peripheral surface of the discharge cover is formed on the upper part adjacent to the suction inclined surface; the method comprises the steps of,

the discharge cap is assembled with the suction member by being engaged with the concave-convex surface formed on the inner surface of the suction member, and assembled with the concave-convex surface formed on the suction member by being engaged with each other so as not to cause the idle rotation.

The piston is characterized in that: the outer circumferential surface is formed in a thin central shape so as to easily reciprocate in the cylinder of the cylinder part and stably maintain an airtight state, and is elongated to the upper central portion to form a packing tube for assembly into the pin of the suction part.

The suction inclined surface of the suction rotating body is characterized in that: an upper horizontal plane and a lower horizontal plane are formed at the upper and lower ends, respectively, in order to facilitate the user to feel the rotation completion time point of the suction rotating body, and a rotation control protrusion is formed at a position adjacent to the lower horizontal plane.

In the pipette quantitative suction cap structure to which the present invention is applied as described above, the non-rotation elevating movement is achieved by causing the piston 33 constituting the suction part 30 to reciprocate inside the cylinder 41 of the cylinder part 40 and causing the guide protrusion 31 of the piston driving part 34 for driving the piston 33 to reciprocate to be guided by the guide hole 13 formed in the extension part 12 of the mounting cap 10, and at the same time, the content is sucked into the cylinder 41 in a state of being located at the upper horizontal surface 72a and the lower horizontal surface 72b of the suction inclined surface 72 of the suction rotary body 70 by the rotation of the suction rotary body 70 mounted in a manner capable of idling in the mounting cap 10 and discharged to be used by the suction action of the discharge cap 50 by causing the piston driving part 34 to be located at a position acted by the spring force of the spring 80 and causing the guide protrusion 31 of the piston driving part 34 to be located at a position regulated by the suction inclined surface 72 formed at the inner side of the suction rotary body 70,

first, by improving the structure capable of respectively executing the lifting operation of the suction cap and the separation and use of the container body 1, the suction cap can be used for sucking and discharging the content stably, and the problem existing in the quantitative discharging device for the liquid container of the preregistration invention which is used for discharging the high-price content and is caused by easily separating the suction cap from the main container 1 under the condition of carrying and using can be solved by using the mounting cap 10 of the suction cap which is screwed into the opening part 2 of the container body 1 as the medium to stably lock to the container body 1 or separate from the container body 1,

second, an invention that can significantly reduce the production cost and further significantly reduce the economic burden of consumers by simplifying the number of parts constituting the suction cap and improving productivity in the assembly production process is very useful.

Drawings

Fig. 1 is a schematic view of a constant volume discharge device for a liquid container according to the related art.

Fig. 2 is a view showing a separated structure of a pipette quantitative suction cap to which the present invention is applied.

Fig. 3 is a separated cross-sectional view of a pipette metering cover to which the present invention is applied.

Fig. 4 is a combined structure view of a pipette quantitative suction cap to which the present invention is applied, and is an explanatory view before sucking the content.

Fig. 5 is a view showing a combined structure of a pipette quantitative suction cap to which the present invention is applied, and is an exemplary view showing a state in which the contents are sucked.

Fig. 6 is an explanatory view showing a state in which the pipette quantitative suction cap according to the present invention is detached from the container body.

Fig. 7 is an explanatory view of a main part of a pipette quantitative suction cover to which the present invention is applied.

[ symbolic description ]

10: mounting cover

11: cylinder component combined annular frame

12: extension part

13: guide groove

30: suction component

31: guide projection

32: pin rod

33: piston

33a: assembling tube

34: piston driving part

35: concave-convex surface

40: cylinder component

41: cylinder

42: pipette assembly tube

43: fixing flange

50: discharge cap

51: concave-convex surface

60: pipette with a pipette tip

61: assembled component

70: suction rotator

71. 14: barrier ring frame

72: suction inclined plane

72a: upper level surface

72b: lower level surface

73: rotation control boss

Detailed Description

Next, preferred embodiments for achieving the above-described object will be described in detail with reference to the accompanying drawings.

A pipette quantitative suction cap structure to which the present invention is applied, comprising: a container body 1 for storing contents; a pipette 60 for sucking the content stored in the container body 1; a cylinder member 40 to which the pipette 60 is coupled; a mounting cover 10 detachably mounted to the container body 1 while assembling the cylinder part 40; a suction member 30 for sucking the piston 33 reciprocating in the cylinder 41 of the main body member 40 with the piston driving member 34 as a medium; a suction rotator 70 for driving the suction member 30 to perform suction operation; and a discharge cap 50 assembled to the suction member 30.

In the attachment cap 10, a coupling screw is formed on the inner peripheral surface so as to be screwed to a screw formed in the opening 2 of the container body 1 for storing the contents.

The cylinder member coupling annular frame 11 is formed so that the center gas-feed cylinder member 40 penetrates and is assembled with the fixing flange 43 of the cylinder member 40.

A guide groove 13 for guiding the guide projection 31 of the suction member 30 attached to be interlocked with the discharge cap 50 is formed by dividing the extension 12 extending upward from the cylinder member coupling annular frame 11 in the four directions.

The cylinder 41 of the cylinder member 40 penetrates the cylinder member coupling annular frame 11 of the mounting cap 10 to form a fixing flange 43 for undercut fixation, and a pipette assembly tube 42 penetrating the cylinder 41 to be assembled is formed to extend below the fixing flange 43.

The pipette 60 penetrates the pipette assembly tube 42 assembled to the cylinder member 40, is positioned at a position where the contents stored in the container body 1 can be sucked, and is assembled by the assembly member 61 while being positioned inside the cylinder 41.

In the suction part 30, a guide protrusion 31 guided by a guide groove 13 formed in the extension 12 of the mounting cover 10 is formed to protrude in a square direction, and a piston 33 performing a vacuum reciprocating motion in a cylinder 41 is assembled to a pin 32 formed at the center of the recess.

The suction rotator 70 is fitted over the outer surface of the mounting cover 10, and a blocking ring frame 71 formed on the inner side of the lower portion is blocked by the blocking ring frame 14, thereby being assembled in an idle-free manner.

The suction inclined surface 72 is formed by dividing the upper part of the inner peripheral surface into four parts, and can press or release the pressing state of the guide protrusion 31 guided by the guide groove 13 of the extension part 12 of the mounting cover 10 while receiving the elastic force of the spring 80.

An annular frame 74 having an inner diameter corresponding to the outer circumferential surface of the discharge cap 50 is formed at an upper portion adjacent to the suction inclined surface 72.

The discharge cap 50 is assembled so as to be engaged with the suction member 30, and is assembled so that the concave-convex surface 51 formed on the inner surface is engaged with the concave-convex surface 34 formed on the suction member 30 so as not to be free from backlash.

The piston 33 is formed in a thin shape in the center of the outer circumferential surface so as to easily reciprocate in the cylinder 41 of the cylinder part 40 and stably maintain the airtight state, and is extended to the upper center for assembly into the pin 32 of the suction part 30 to form a packing tube 33a.

The suction inclined surface 72 of the suction rotating body 70 is formed with an upper horizontal surface 72a and a lower horizontal surface 72b at upper and lower ends thereof, respectively, for the convenience of a user to feel a time point of completion of rotation of the suction rotating body 70, and a rotation control protrusion 73 is formed at a position adjacent to the lower horizontal surface 72 b.

After the assembly member 61 is assembled to the upper portion of the pipette 60, the pipette quantitative suction cap to which the present invention is applied as described above is assembled by penetrating the pipette assembly tube 42 of the cylinder member 40 from the upper portion to the lower portion of the cylinder member 40, and then the assembly member 61 is assembled to the upper portion of the pipette assembly tube 42 of the cylinder member 40.

Next, the cylinder member 40 with the pipette 60 assembled thereto is assembled to the mounting cap 10, and the cylinder member 40 is inserted from below the mounting cap 10 during assembly, and at this time, the cylinder 41 is assembled by joining the cylinder member penetrating the mounting cap 10 to the annular frame 11 and crimping the fixing flange 43 of the cylinder member 40.

After the cylinder part 40 is assembled to the mounting cap 10, a spring 80 for applying an elastic force to the piston driving part 34 of the suction part 30 is mounted between the inside of the extension 12 of the mounting cap 10 and the outside of the cylinder 41 of the cylinder part 40 located at the extension 12.

Next, after the piston 33 is assembled to the pin 32 of the piston driving member 34 constituting the suction member 30 via the assembly tube 33a so as to be positioned on the extension 12 of the mounting cap 10, the piston 33 is disposed at a position where the suction operation can be performed in the cylinder 41 of the cylinder member 40.

At this time, the guide projection 31 of the piston driving member 34 is disposed at a position that can be guided by the guide groove 13 formed in the extension 12 of the mounting cover 10 in a square direction.

The suction member 30 assembled in the manner described above will be subjected to the elastic force of the spring 80.

The suction rotator 70 is assembled to the outside of the mounting cover 10 in a state that the cylinder part 40 is assembled to the mounting cover 10 and the assembly of the suction part 30 is completed.

The blocking ring frame 71 formed at the inner side of the lower portion of the suction rotating body 70 is blocked and assembled to the blocking ring frame 14 of the mounting cover 10 so as to be rotatable at the outer side of the mounting cover 10.

Further, the guide projection 31 of the piston driving member 34 will be selectively pressed or released from its pressed state by the suction inclined surface 72 formed on the upper side of the inner side surface of the suction rotating body 70 assembled in the manner described above.

The piston driving part 34 of the suction part 30 will protrude from the upper annular frame 74 of the suction rotating body 70 assembled in the above-described manner, and the mounting cover 50 will be assembled to the above-described piston driving part 34, and the concave-convex surface 51 formed on the lower side of the inner side surface will be assembled in engagement with the concave-convex surface 35 of the piston driving part 34, thereby achieving a stable assembled state without rotation.

When it is necessary to quantitatively aspirate the contents in the container body 1 of the pipette application aspiration cap assembled and configured as described above, the aspiration rotator 70 is rotated in the direction in which the screw engagement is loosened, so that the guide projection 31 of the piston driving member 34 located in the lower horizontal surface 72b of the aspiration inclined surface 72 of the aspiration rotator 70 is disengaged from the lower horizontal surface 72 b.

When the suction rotating body 70 is rotated in the screw-coupling loosening direction, the guide projection 31 of the piston driving member 34 is separated from the lower horizontal surface 72b and moves upward along the suction inclined surface 72.

The guide protrusion 31 of the piston driving part 34 may be moved upward along the suction inclined surface 72 of the suction rotating body 70 by the elastic force of the spring 80.

When the piston driving member 34 is moved up to suck as described above, the piston 33 assembled to the pin 32 via the assembly tube 33a is moved to suck the inside of the cylinder 41 of the cylinder member 40, and the contents in the container body 1 transferred along the pipette 60 inside the cylinder 41 are flown into the inside of the cylinder 41 by the vacuum pressure generated at this time.

The state in which the content flows into the cylinder 41 is shown in fig. 5.

When the suction rotating body 70 is further rotated with force in the state described above, the rotational force is transmitted to the mounting cover 10 mounted on the opening 2 of the container body 1, and the pipette quantitative suction cover is separated from the container body 1 (see fig. 6).

After the content flows into the cylinder 41 of the cylinder part 40, the discharge cap 50 assembled into the suction driving part 34 is brought into a state of being separated from the annular frame 74 of the suction rotating body 70, so that the content flowing into the cylinder 41 can be sucked and discharged.

When the contents are required to be discharged, the discharge cap 50 is simply pushed down to move the guide protrusion 31 of the piston driving member 34 straight down along the guide groove 13 of the extension 12 of the mounting cap 10, and the piston 33 assembled to the piston driving member 34 is lowered to suck and discharge the contents inside the cylinder 40, so that the contents are applied to a desired portion by the pipette 60.

Fig. 7 illustrates a state in which the guide protrusion 31 of the piston driving part 34 of the suction part 30 is located on the upper horizontal surface 72a of the suction inclined surface 72 of the suction rotary body 70, a state in which the contents are sucked into the cylinder 41 of the cylinder part 40, and a state in which the guide protrusion 31 of the piston driving part 34 can be vertically lowered in the guide groove 13 of the extension part 12 of the mounting cap 10 according to the pressing operation of the discharge cap 50 regardless of the operation of the suction rotary body 70.

After the discharging use of the content is completed in the above-described manner, the mounting cap 10 is reinstalled into the opening 2 of the container body 1, and when the mounting cap 10 is successfully mounted to the container body 10 to stop the rotation, the rotation force is transmitted to the suction rotating body 70 assembled to rotate on the mounting cap 10 and rotated in the screw locking direction, and at this time, the guide protrusion 31 of the piston driving part 34 of the suction part 30 located on the upper horizontal surface 72a of the suction inclined surface 72 is separated from the upper horizontal surface 32a and moves downward while being pressed by the suction inclined surface 72.

As the piston driving member 34 moves downward, the piston 33 assembled in a interlocked manner therewith will be located at the lower portion of the cylinder 41.

At the same time as the guide projection 31 of the piston driving member 34 pressed by the above-mentioned suction inclined surface 72 reaches the lower horizontal surface 72b, the above-mentioned suction rotating body 70 will stop rotating by means of the rotation control projection 73 and enter the state shown in fig. 4.

As described above, since the discharge cap 50 is in a state of being abutted into the upper annular frame 74 of the suction rotator 70 while the mounting cap 10 maintains a stable locked state with respect to the container body 1, it is possible to solve the problem of the conventional pipette quantitative suction cap in which the content is lost due to unexpected actions of the user even when carrying and using.

Claims

1. A pipette quantitative aspiration cap structure comprising:

a mounting cap (10) which is formed with a coupling screw on the inner peripheral surface for screw-coupling to a screw formed in an opening (2) of a container body (1) for storing contents, and which is formed with a cylinder member coupling annular frame (11) which is capable of penetrating a cylinder member (40) and is assembled with a fixing flange (43) of the cylinder member (40) while being engaged with the fixing flange, wherein a guide groove (13) for guiding a guide projection (31) of a suction member (30) mounted in a manner of interlocking with a discharge cap (50) is formed in an extension (12) formed extending upward from the cylinder member coupling annular frame (11) in a square direction;

a cylinder member (40) in which a cylinder (41) penetrates through the cylinder member coupling annular frame (11) of the mounting cover (10) and forms a fixing flange (43) for undercut fixing, and a pipette assembly tube (42) penetrating through the cylinder (41) for assembly is formed at the lower part of the fixing flange (43);

a pipette 60 penetrating a pipette assembly tube 42 assembled to the cylinder member 40 and positioned at a position where the contents stored in the container body 1 can be sucked, and assembled by an assembly member 61 in a state of being positioned inside the cylinder;

a suction part (30) protruding in four directions to form a guide protrusion guided by a guide groove (13) formed in an extension part (12) of the installation cover (10), a piston (33) performing vacuum reciprocating movement in a cylinder (41) being assembled to a pin (32) formed in the center of the recess;

a suction rotating body (70) which is sleeved on the outer side surface of the installation cover (10), wherein a blocking annular frame (71) formed on the inner side of the lower part of the suction rotating body (70) is blocked by a blocking annular frame (14) formed on the installation cover (10) so as to be assembled in a free-running mode, a suction inclined surface (72) which can press or release the pressing state of a guide protrusion (31) guided by a guide groove (13) of an extension part (12) of the installation cover (10) while receiving the elastic force of a spring is formed in the upper quarter of the inner peripheral surface, and an annular frame (74) with the inner diameter corresponding to the outer peripheral surface of the discharge cover (50) is formed on the upper part adjacent to the suction inclined surface (72); the method comprises the steps of,

the discharge cap (50) is configured to be assembled with the suction member (30) while being engaged with each other, and is configured to be assembled with an uneven surface (51) formed on the inner surface engaged with an uneven surface (34) formed on the suction member (30) so as not to cause free-wheeling.

2. The pipette quantitative suction cover structure according to claim 1, wherein: the piston (33) adopts a shape with a thinner center of the outer peripheral surface so as to easily reciprocate in the cylinder (41) of the cylinder member (40) and stably maintain the airtight state, and is elongated to the upper center for assembly into the pin (32) of the suction member (30) to form a packing tube (33 a).

3. The pipette quantitative suction cover structure according to claim 1, wherein:

the suction inclined surface (72) of the suction rotating body (70) forms an upper horizontal surface (72 a) and a lower horizontal surface (72 b) at the upper and lower ends respectively for the convenience of a user to feel the time point of completion of rotation of the suction rotating body (70), and forms a rotation control protruding part (73) at a position adjacent to the lower horizontal surface (72 b).