JPH07100307A - filter - Google Patents

Abstract

(57) [Summary] [Purpose] While making the case member and lid member removable
Make sure that the case member and the lid member do not run idle. [Structure] A large diameter portion 1 having a larger diameter than the body portion 11 by expanding the opening end of a cup-shaped casing 10 into a flange shape.
2 is formed, and the engagement protrusion 1 that protrudes toward the opening side by extending three positions of the wall material of the large diameter portion 12 in the opening direction
3 is formed, and notches 41 are formed at three positions on the outer periphery of the disk-shaped set plate 40 in alignment with the engaging projections 13. After covering the casing 10 with the set plate 40, the set plate 40 By attaching a ring-shaped fastener 50 having a female thread formed on the outer periphery and having a female thread to be screwed on the inner peripheral wall and having a narrow diameter portion 51 into which the body portion 11 can be inserted but the large diameter portion 12 cannot penetrate, Large diameter part 12
The fastener 50 is locked on the back side of the set plate 40 to draw it toward the casing 10 side and fix it. Therefore, the set plate 40 and the casing 10 do not run idle and can be attached and detached as necessary.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to filters, and more particularly to replaceable filters.

[0002]

2. Description of the Related Art Conventionally, an oil strainer disclosed in Japanese Utility Model Publication No. 3-46812 is known as a filter of this type. In FIG. 7, a flange 2 is formed on the outer circumference of the cup-shaped case 1 near the opening end, and the flange 2 is formed to expand the outer circumference in the radial direction, while the lid member 3 for covering the opening of the case 1 is formed. Has an inner diameter such that the open end of the case 1 can be inserted, and a cylindrical threaded portion 4 formed with a male screw is formed on the outer circumference. The ring-shaped fastener 5 has an L-shaped cross section, and has a cylindrical portion 6 on the inner peripheral surface of which is formed a female screw into which the male screw of the screw portion 4 can be screwed, and the end portion of the cylindrical portion 6 is located on the center side. The pressing portion 7 is provided so as to be bent to have a small inner diameter. Here, the inner diameter of the tubular portion 6 is larger than the outer shape of the flange 2 of the case 1, and the inner diameter of the holding portion 7 is smaller than the outer shape of the flange 2 and larger than the outer shape of the case 1. A filter medium 8 is housed in the case 1.

When the case 1 and the lid member 3 are fixed to each other, an O-ring 9 is arranged on the opening side surface of the flange 2 of the case 1, and the opening end of the case 1 is placed in the opening of the screw portion 4 of the lid member 3. insert. At this time, the O-ring 9 is sandwiched between the flange 2 and the end surface of the screw portion 4.
Next, the fastener 5 is put on the case 1 from the side opposite to the holding portion 7. The case 1 penetrates the tubular portion 6 and the pressing portion 7,
The female screw formed on the inner circumference of the cylindrical portion 6 and the male screw formed on the outer circumference of the screw portion 4 are screwed together. When the screw is tightened, the pressing portion 7 comes into contact with the flange 2 and integrally with the lid member 3, the case 1 is pulled toward the lid member 3 side and fixed.

On the other hand, when it is desired to remove the case 1, the fastener 5 is rotated in the opposite direction to release the screw engagement with the lid member 3, and the fastener 5 and the case 1 are removed.

[0005]

In the above-mentioned conventional filter, if the fastener 5 is rotated while supporting the case 1 during assembly, the lid member 3 is rotated together with the fastener 5 and tightened tightly. There was a problem that there were things that could not be done. In particular, like an oil filter for automobiles, the lid member 3 is plate-shaped and has a female screw hole formed at the center, and the male screw member protruding from the engine is screwed into the female screw hole. In such a case, even if the case 1 is supported and rotated, the lid member 3 slips and cannot be properly fixed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a filter capable of freely attaching and detaching the case and the lid member while preventing the case and the lid member from idling. .

[0007]

In order to achieve the above object, the invention according to claim 1 has a bottomed cylindrical shape having a large-diameter portion in which the open end at the tip of the body is expanded more than the body. A case member and a filter medium housed in the case member;
A lid member having a communication hole for covering the inside and outside of the case member while covering the open end of the body portion, and a male screw portion on the outer peripheral side surface, and a male screw portion of the lid member screwed on the inner peripheral surface. A ring-shaped fastener having a female threaded portion capable of having a narrower diameter smaller than the large diameter portion of the case member, and a large diameter portion of the case member facing the opening direction. In addition to forming a protruding portion that protrudes, a through-hole portion into which the protruding portion can enter and engage is formed in the lid member.

According to the second aspect of the invention, there is provided a bottomed cylindrical case member having a large-diameter portion in which the opening end at the tip of the body portion is larger in diameter than the body portion, and the case member is housed in the case member. A filter member, a lid member having a communication hole that covers the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral side surface, and a male screw of the lid member on the inner peripheral surface. A ring-shaped fastener having a narrow diameter portion having a smaller diameter than the large diameter portion of the case member having a female screw portion that can be screwed into the large diameter portion of the case member, In addition to forming a protrusion projecting toward the opening direction, the lid member is formed with a notch portion in which the male screw portion is notched and the protrusion enters and is engageable.

Further, in the invention according to claim 3, a bottomed cylindrical case member having a large diameter portion in which the opening end at the tip of the body portion is expanded in diameter from the body portion, and is housed in the case member. A filter member, a lid member having a communication hole that covers the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral side surface, and a male screw of the lid member on the inner peripheral surface. A ring-shaped fastener having a narrow diameter portion having a smaller diameter than the large diameter portion of the case member having a female screw portion that can be screwed into the large diameter portion of the case member, A convex portion protruding toward the opening direction is formed, a concave portion into which the convex portion is inserted and engageable is formed in the lid member, and the concave portion is provided on the inner peripheral surface of the body portion of the case member. And extended in the opening direction along the large diameter portion, To thereby form the groove annular housing the seal member, in a portion opposed to the convex portion at the end portion of the open end a configuration equipped with a partition member formed with notches.

In the invention according to claim 4, a bottomed cylindrical case member having a large-diameter portion in which the opening end at the tip of the body portion has a diameter larger than that of the body portion, and is housed in the case member. A filter member, a lid member having a communication hole that covers the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral side surface, and a male screw of the lid member on the inner peripheral surface. A ring-shaped fastener having a narrow diameter portion having a smaller diameter than the large diameter portion of the case member having a female screw portion that can be screwed into the large diameter portion of the case member, A convex portion protruding toward the opening direction is formed, a concave portion into which the convex portion is inserted and engageable is formed in the lid member, and the narrow diameter portion in the female screw portion of the fastener is formed. A guide extension part that can guide the male screw part of the lid member at the tip opposite to Provided was there as a constituent.

[0011]

In the invention according to claim 1 configured as described above, the filter medium is housed inside the case member, and the opening of the case member is covered with the cover member. At this time, since the convex portion of the case member enters and engages with the through-hole portion of the lid member, they cannot rotate freely. Further, since it is a through hole, the engagement state between the through hole portion and the convex portion can be confirmed from the opposite side. Next, when the case member is inserted from the female screw side of the fastener, the end of the female screw comes into contact with the end of the male screw formed on the outer periphery of the lid member, and when both are screwed, they are fastened to the lid member. The distance to the ingredients will be closer. At this time, the narrow-diameter portion of the fastener approaches the large-diameter portion and comes into contact therewith,
The fastener will press and fix the lid member against the open end of the case member.

Further, in the invention according to claim 2 configured as described above, the convex portion of the case member enters into and engages with the notch formed by notching the outer periphery of the lid member, and similarly. The lid member is fixed to the opening of the case member by screwing the fastener and the lid member together. Furthermore, in the invention according to claim 3 configured as described above, the partition member extending in the opening direction from the inner peripheral surface of the body portion forms an annular groove between the large diameter portion. There is. By accommodating the seal member in this groove, the cover member hermetically holds the contact portion when the cover member covers the open end of the case member. By the way, a part of the peripheral wall of the large-diameter portion projects toward the opening direction to form a convex portion, which tends to be an obstacle when the ring-shaped sealing member is pushed into the groove, as compared with a flat portion. However, since the notch is formed at the opening end of the partition member facing the convex portion, the inner peripheral surface side of the large diameter portion is open. Therefore, it is easy to push it into the groove from this surface.

In the invention according to claim 4 configured as described above, when the case member is first inserted into the fastener, the lid member is the guide extension portion formed in the fastener. It is guided and introduced into the female screw part. In this state, the fastener can be freely rotated with the axes aligned with each other while being covered with the lid member, and the male screw and the female screw start screwing before making one rotation.

[0014]

As described above, according to the present invention, the lid member and the case member are detachable, and the lid member and the case member are prevented from freely rotating. It is possible to provide a filter that can be improved. In particular, since the counterpart with which the convex portion engages is a through hole, it is possible to work after confirming the engagement state with the convex portion, and it is possible to work by mistake without engaging and idle. It can be prevented.

According to the second aspect of the present invention, since the convex portion of the case member engages with the notch formed on the outer periphery of the lid member, the outer shape of the lid member can be made as small as possible. Further, it is possible to visually recognize the state in which the convex portion has entered the notch from the outside, and it is possible to prevent the work from idling without being engaged by mistake. Further, claim 3
According to the aspect of the invention, since the convex portion does not get in the way when the seal member is housed, the seal member can be easily attached and replaced. Further, according to the invention of claim 4, the lid member is first inserted into the guide extension portion of the fastener, and then screwed.
The screwing can be started more easily than when the screwing is suddenly performed, and thus the deformation of the convex portion can be prevented. Further, since the center of gravity of the fastener can be moved to the mounting member side by the amount of the guide extension portion, it is also effective in reducing vibration when used in an engine of an automobile or the like.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a replaceable oil filter for an automobile to which a filter according to an embodiment of the present invention is applied. In the figure, a cup-shaped casing 10 with a bottom accommodates a spring 20 composed of a leaf spring and a cartridge-type filter medium 30, and the opening end of the casing 10 is covered with a set plate 40 to form a ring. The set plate 40 is fixed to the opening of the casing 10 with a fastener 50 having a shape. The open end of the cylindrical casing 10 forms a large diameter portion 12 having a diameter slightly larger than that of the body portion 11, and the peripheral wall has a crank-shaped cross section. As shown in FIGS. 3 and 4, engagement projections 13 are formed at the ends of the large-diameter portion 12 at equal intervals so as to project toward the opening direction at three locations. A partition member 14 having an annular band plate is welded and fixed near the boundary between the large diameter portion 12 and the body portion 11 on the inner peripheral surface of the casing 10. The partitioning member 14 is disposed from the vicinity of the boundary toward the opening end, and the end portions on the opening end side are evenly spaced from each other at the six convex portions 14a.
And a notch 14b are formed. Then, the convex portion 14
The end surface of a is made to coincide with the end surface of the large diameter portion 12.

As shown in FIG. 2, the spring 20 has three peripheral wall abutting arms 22 extending from the base portion 21 at equal intervals in the radial direction, and the spring 20 extending in the radial direction between the peripheral wall abutting arms 22. The three filter medium support arms 23 are provided. As shown in FIG. 1, the peripheral wall abutting arm 22 has an outer peripheral side end 22a curved about 110 degrees so that when the peripheral wall abutting arm 22 is inserted into the casing 10, the same end 22a spreads the inner periphery of the casing 10. Angle. The filter medium support arm 23 is bent obliquely from the base portion 21 in the same direction as the curved direction of the peripheral wall contact arm 22, and the length thereof is smaller than the inner diameter of the casing 10.

The filter medium 30 is formed by folding a filter paper into a pleated shape so as to have a cylindrical shape, covers both end faces of a ring shape, and is provided with a relief valve 31 at one opening and closed. A ring-shaped seal member 32 is held on the open side from the periphery of the opening toward the outside. The disc-shaped set plate 40 has a diameter slightly larger than that of the large-diameter portion 12, and the casing 1 is provided on the peripheral wall thereof.
Notches (holes, notches) 41 into which the zero engagement protrusions 13 can enter are formed at three locations. In addition,
In the present embodiment, the outer periphery is cut out, but as shown in FIG. 6, the set plate 40 is made larger and the engagement hole 4 is formed.
5 can also be formed. This makes it easier to visually recognize the insertion state of the engagement protrusion 13. On the other hand, when notched, the set plate 40 can be made small in diameter to make the whole compact. The central portion of the set plate 40 is bulged toward the inner surface side of the casing 10, and at the center thereof is formed an outlet 42 which can be inserted into an opening at one end of the filter medium 30 and whose inner peripheral wall has a female screw. A plurality of inlets 43 are formed around the outlet 42. A seal member 44, which is held between the set plate 40 and the mounting surface, is held on the outer surface of the set plate 40.

The ring-shaped fastener 50 has an L-shaped cross section in which one end of a cylinder is curved toward the center side, and the large diameter portion 12 of the casing 10 can penetrate the cylindrical portion.
With respect to the narrow diameter portion 51 which is curved toward the center side, the body portion 11 can penetrate, but the large diameter portion 12 cannot penetrate. Further, on the inner peripheral surface of the cylindrical portion, a female screw 52 is provided on the inner side.
Is formed, and the portion from the opening end to the female screw 52 portion is the guide portion 53. Next, the assembling method of the present embodiment having the above configuration will be described. First, the partition member 14 is welded and fixed to the inner circumference of the casing 10. At this time, the notch 14b formed in the end portion of the partition member 14 is formed in the casing 10
So as to overlap with the engaging projection 13 of. In the present embodiment, the number of notches 14b is greater than the number of engaging protrusions 13.
The number of is larger and the alignment is easier. By fixing the partition member 14, an annular groove is formed between the large diameter portion 12 and the convex portion 14a of the partition member 14, so that the O-ring 60 is accommodated therein.
The O-ring 60 may be pushed in from the opening direction side in the portion without the engaging projection 13, but cannot be pushed in the portion with the engaging projection 13 from this direction. However, since the notch 14b of the partition member 14 faces the portion where the engaging protrusion 13 is present and the inner peripheral side is open,
It is easy to push it into the groove from this open side.

When the O-ring 60 is housed, the leaf spring 20 is inserted through the opening of the casing 10. Since the end portion 22a of the peripheral wall contact arm 22 has an angle of about 110 degrees, the spring 20 is pushed into the casing 10 while curving the peripheral wall contact arm 22 inward. In this state, the end portion 22a has the casing 10
Since it is pressed against the inner peripheral surface of the spring, the spring 20 does not fall off. The filter medium support arm 23 smaller than the inner diameter of the casing 10 is bent obliquely toward the opening side of the casing 10. When the filter medium 30 is housed in the casing 10 from the relief valve side, the filter medium 3 is removed.
One end surface at 0 contacts the tip of the filter medium support arm 23. The elastic filter medium support arm 23 is the casing 1
Since the filter medium 30 can be bent toward the inner side of 0, the filter medium 30 is elastically supported by the filter medium support arm 23.

Next, the casing 1 with the set plate 40
Cover the 0 opening. At this time, the notch 41 formed on the outer periphery of the set plate 40 and the engaging protrusion 13 of the casing 10 are aligned with each other, and the engaging protrusion 1 is inserted into the notch 41.
Make sure that 3 enters. At this time, the filter medium 30
The opening end side of the casing 10 has a ring shape, and the end face is closed, but the center is open, and the portion protruding at the center of the set plate 40 is inserted into this opening. When installing the set plate 40,
The filter medium support arm 23 of the spring 20 is bent to push the filter medium 30 into the inside of the casing 10, and the sealing member 32 of the filter medium 30 flows out the outlet 42.
Abut on the peripheral edge of and seal. As a result, the casing 1
0, and the set plate 40, the space surrounded by the outlet 4
The inside of the filter medium 30 that communicates with the outside via 2;
It is isolated from the outside of the filter medium 30 that communicates with the outside through the inflow port 43. That is, the filter paper of the filter medium 30 is arranged between the outflow port 42 and the inflow port 43 in the casing 10.

The set plate 40 is used for the casing 1.
When the 0 opening is covered, the O-ring 60 housed in the large-diameter portion 12 is brought into contact with the O-ring 60 to be deformed. Next, from the casing 11 side of the casing 10, the narrow-diameter portion 51 of the ring-shaped fastener 50.
And insert it on the opposite side. The narrow diameter portion 51 of the fastener 50
When the end on the opposite side is inserted beyond the large-diameter portion 12 of the casing 10 until the end overlaps with the peripheral portion of the set plate 40, the set plate 40 is inserted into the fastener 50.
Enters into the guide extension portion 53 on the inner peripheral surface of the. The guide extending portion 53 is in front of the female screw 52, and the set plate 4
0 enters the fastener 50 in a freely rotatable state.
When the fastener 50 is rotated in this state, the male screw formed around the set plate 40 and the female screw 52 formed on the inner peripheral surface of the fastener 50 are screwed together. Originally, since the diameter of the set plate 40 is large, the female screw 5 of the fastener 50 is
Although it is difficult to screw it with 2, it is easy to screw it because it can enter the guide extension portion 53 and only align the axis of the set plate 40 and the fastener 50.

When both screws are screwed together, the set plate 40 is pulled toward the narrow diameter portion 51 side of the fastener 50. The large diameter portion 12 of the casing 10 is narrowed between the set plate 40 and the narrow diameter portion 51 of the fastener 50.
Since the large-diameter portion 12 cannot penetrate the narrow-diameter portion 51, the set plate 40 is pressed and held by the fastener 50 toward the opening side of the large-diameter portion 12. The assembled state of the casing 10, the set plate 40, and the fastener 50 is shown in an exploded perspective view of FIG. That is,
The set plate 40 cannot rotate with respect to the casing 10 due to the fitting of the notch 41 and the engagement protrusion 13,
Further, the screwing with the fastener 50 prevents the movement toward the opening side. When mounting on an engine of an automobile, a cylindrical male screw projects from the mounting surface, and a female screw formed on the inner peripheral wall of the outlet 42 of the set plate 40 is screwed. At this time, if the casing 10 is rotated, the set plate 40 rotates without idling and can be attached to and detached from the male screw. After the removal, the set plate 40 can be removed from the casing 10 by rotating the fastener 50.
It is also possible to replace only 0 and reuse the casing 10 and the like.

Thus, the cup-shaped casing 1
The opening end of 0 is expanded into a flange shape to form a large-diameter portion 12 having a diameter larger than that of the body portion 11, and three wall members of the large-diameter portion 12 are extended toward the opening side by extending in three directions. A disc-shaped set plate 4 is formed by forming an engagement protrusion 13 protruding toward
On the outer periphery of 0, notches 41 are formed by aligning the positions with the engaging protrusions 13 at three positions. After covering the casing 10 with the set plate 40, the male screw and the screw formed on the outer periphery of the set plate 40 are screwed. Fastening on the back side of the large-diameter portion 12 by mounting a ring-shaped fastener 50 having a matching internal thread on the inner peripheral wall and having a narrow-diameter portion 51 into which the body portion 11 can be inserted but the large-diameter portion 12 cannot penetrate. The tool 50 is locked and the set plate 40 is pulled toward the casing 10 side and fixed. Therefore, the set plate 40 and the casing 10 do not run idle and can be attached and detached as necessary.

Although the present invention is used for filtering oil in the above-mentioned embodiments, it may be used for filtering other fluids. Further, regarding the narrow diameter portion 51,
It is also possible to configure a part of the fastener 50 to project inward as in Gotoku. Furthermore, the set plate 40
When the engaging hole 45 is formed by increasing the diameter of the engaging hole 45, the engaging protrusion 13 may enter into the engaging hole to form an engaging recess instead of the through hole. Further, in the present embodiment, the peripheral wall of the casing 10 is bent in a crank shape to form the large-diameter portion 12, but the large diameter portion 12 may be simply bent outward.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a replaceable oil filter for an automobile to which a filter according to an embodiment of the present invention is applied.

FIG. 2 is a top view of a spring.

FIG. 3 is a perspective view of an open end of a casing.

FIG. 4 is a cross-sectional view of an open end of a casing.

FIG. 5 is an exploded perspective view of a replaceable oil filter.

FIG. 6 is a perspective view of a set plate of a replaceable oil filter according to another embodiment.

FIG. 7 is a cross-sectional view of a conventional replaceable oil filter.

[Explanation of symbols]

 10 ... Casing 11 ... Body 12 ... Large diameter part 13 ... Engagement protrusion 14 ... Partition member 14b ... Notch 30 ... Filter medium 40 ... Set plate 41 ... Notch 45 ... Engagement hole 50 ... Fastener 51 ... Narrow diameter Part 52 ... Female screw 53 ... Guide extension part 60 ... O-ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromitsu Adachi 1-4-1 Chuo, Wako-shi, Saitama, Ltd. Inside Honda R & D Co., Ltd. (72) Inventor Keiichi Terada 7800, Nakase, Hamakita-shi, Shizuoka Toyo ▲ Ro ▼ Machine Manufacturing Co., Ltd. (72) Inventor Hiroaki Yamashita 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ Ro ▼ Machine Manufacturing Co., Ltd. (72) Inventor Hiroshi Morikawa 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ Machine Manufacturing Co., Ltd. Within

Claims (4)

[Claims] 1. A bottomed cylindrical case member having a large-diameter portion in which an open end at the tip of the body is expanded more than the body.
A filter member housed in the case member, a lid member having a communication hole for covering the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral surface, and an inner peripheral surface. And a ring-shaped fastener having a female threaded portion that can be screwed into the male threaded portion of the lid member and a narrowed diameter portion having a smaller diameter than the large diameter portion of the case member. A filter characterized in that a convex portion protruding toward an opening direction is formed on a large-diameter portion of the member, and a through-hole portion into which the convex portion enters and is engageable is formed on the lid member. 2. A bottomed cylindrical case member having a large-diameter portion in which the opening end at the tip of the body portion is made larger in diameter than the body portion,
A filter member housed in the case member, a lid member having a communication hole for covering the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral surface, and an inner peripheral surface. And a ring-shaped fastener having a female threaded portion that can be screwed into the male threaded portion of the lid member and a narrowed diameter portion having a smaller diameter than the large diameter portion of the case member. A large-diameter portion of the member is formed with a convex portion projecting toward the opening direction, and the lid member is provided with a notch portion into which the male screw portion is cut out and the convex portion enters and can be engaged. A filter characterized by being formed. 3. A bottomed cylindrical case member having a large-diameter portion in which the opening end at the tip of the body portion is made larger in diameter than the body portion,
A filter member housed in the case member, a lid member having a communication hole for covering the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral surface, and an inner peripheral surface. And a ring-shaped fastener having a female threaded portion that can be screwed into the male threaded portion of the lid member and a narrowed diameter portion having a smaller diameter than the large diameter portion of the case member. The large-diameter portion of the member is formed with a convex portion projecting toward the opening direction, and the lid member is formed with a concave portion into which the convex portion is inserted and engageable with the lid member. Is provided on the inner peripheral surface of the portion and extends in the opening direction along the large diameter portion to form an annular groove portion for accommodating the seal member between the large diameter portion and the end portion of the opening end. A partition member having a notch formed in a portion facing the convex portion in A filter having a configuration including. 4. A bottomed cylindrical case member having a large-diameter portion in which the opening end at the tip of the body portion is made larger in diameter than the body portion,
A filter member housed in the case member, a lid member having a communication hole for covering the inside and outside of the case member while covering the open end of the body portion, and a lid member having a male screw portion on the outer peripheral surface, and an inner peripheral surface. And a ring-shaped fastener having a female threaded portion that can be screwed into the male threaded portion of the lid member and a narrowed diameter portion having a smaller diameter than the large diameter portion of the case member. The large-diameter portion of the member is formed with a convex portion projecting toward the opening direction, and the lid member is formed with a concave portion into which the convex portion is inserted and engageable with the lid member. A filter, wherein a guide extension portion capable of guiding a male screw portion of the lid member is provided at a tip of the screw portion opposite to the narrow diameter portion.