JP2001250653A - Bulb socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the volume of light, irradiated from a base part of a wedge base bulb, leaking outside through a slit. SOLUTION: A bulb socket 30 has a pair of holding metal fittings 50, and an elastic holding part 56, enabled to hold a base part 23 of the wedge base bulb elastically, is formed to each of holding metal fittings 50. By forming a pair of slits 46, 47 extending from the opening side to the inner part of a square-shaped case part 36, an arm piece 49, enabled to hold the elastic holding part 56 between the slits 46, 47 elastically, is formed. As the slit 47 is installed oblique to the direction of the thickness of the square-shaped case part 36 at the side of the elastic holding part 56, the volume of light leaking outside from the base part 23 through the slit 47 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a valve socket for a wedge-based valve.

[0002]

2. Description of the Related Art Conventionally, as a valve socket for mounting a wedge-based valve, Japanese Patent Application Laid-Open No. 7-230867 has been disclosed.
Is disclosed in Japanese Patent Application Laid-Open Publication No. HEI 9-203 (1995). This will be described below with reference to FIG. The wedge base bulb 1 is a bulb part 3 made of glass and containing a filament 2.
And a flat base portion 4. On both side surfaces of the base portion 4, a locking projection 5 is provided at the center, and a lead wire 6 connected to the filament 2 is drawn out from the bottom surface side.

On the other hand, the valve socket 7 includes a socket body 8 made of synthetic resin and a pair of holding fittings 9. The socket body 8 includes a cylindrical portion 11 that can accommodate the base portion 4 of the wedge base valve 1 and a pair of holding fittings 9. A pair of arm pieces 1 is provided on the wall surface of the cylindrical portion 11.
2 are provided symmetrically, and are capable of flexing and deforming outward to each other. On both sides of each arm piece 12,
A slit 13 is formed from the opening side to the back side. A cylindrical receiving portion 14 is provided on the outer surface of the distal end of each arm piece 12.

[0004] The holding fitting 9 includes an elastic holding portion 16 for holding the wedge base valve 1 and an electrode portion 17 that can contact the lead wire 6. The elastic holding portion 16 is arranged so as to be elongated in the up-down direction and along the inside of the arm piece 12. The width of the arm piece 12 is constant, and is smaller than the width of the arm piece 12. Elastic holding part 1
At the upper part of 6, a locking portion 18 is provided so as to protrude inward, and can be elastically engaged with the locking projection 5 of the base portion 4. Further, a pressing portion 19 is formed by folding the distal end side downward from the locking portion 18, and the pressing portion 19 can be attached to the receiving portion 14 of the arm piece 12.

When the base portion 4 of the wedge base valve 1 is inserted into the cylindrical portion 11, the locking projection 5 comes into contact with the locking portion 18 to bend the elastic holding portion 16 outward. Then, the pressing portion 19 pushes the arm piece 12 outward to bend outward together with the elastic holding portion 16. When the locking projection 5 gets over the locking portion 18, the elastic holding portion 16 and the arm piece 12 are deformed to return, and the locking portion 18 is engaged with the locking projection 5, so that the wedge base valve 1 is prevented from coming off. . As described above, the elastic holding portion 16 is elastically supported by the arm pieces 12, so that the elastic holding portion 16 is reinforced.

[0006]

The above-mentioned bulb socket 7 is used for an uncolored and very common wedge base bulb 1 of the bulb part 3, but in recent years, such as an amber bulb, etc. The use of a bulb socket provided with an arm piece as described above has been studied for a bulb having a colored surface. By the way, in the step of coloring the surface of the bulb part, the base part is held and the bulb part is immersed in paint, so that a part of the base part is not colored. When the above-described bulb socket 7 is used for this bulb, the light beam emitted from the uncolored base portion 4 leaks outside through the slit 13. Then, there is a problem that light of a color different from the light emitted from the bulb portion 3 is seen from the outside.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a bulb socket capable of reducing the amount of light emitted from the base of a wedge-based bulb leaking outside through a slit. Where you do it.

[0008]

According to a first aspect of the present invention, there is provided a valve socket comprising a tubular portion capable of accommodating a base portion of a wedge base valve and a wall portion forming the tubular portion. By forming a pair of slits from the opening side edge toward the back side, a socket body including an arm piece provided to be flexibly deformable between the two slits, and along the arm piece in the cylindrical portion. An elastic holding portion provided and supported by the arm piece and capable of elastically holding the base portion in the thickness direction, and a holding bracket having an electrode portion electrically connected to an electrode of the wedge base valve. A valve socket provided, wherein at least one of the pair of slits has an outer opening that opens to an outer surface of the wall and an inner opening that opens to an inner surface of the wall. Position, has a characteristic where the there is a positional displacement slit provided in displaced position from the position aligned with respect to the thickness direction of the wall portion of the.

According to a second aspect of the present invention, in the first aspect, the position of the inner opening of the misalignment slit is provided closer to the center of the elastic holding portion in the width direction than the position of the outer opening. It is characterized by where it is.

According to a third aspect of the present invention, in the first or second aspect, in the elastic holding portion, the arm is located inside the cylindrical portion from one side of the arm at a position located at the inner opening of the displacement slit. It is characterized in that the cover is provided in the direction in which the width increases toward.

[0011]

According to the first aspect of the present invention, when the slit is formed in parallel with the thickness direction of the wall forming the cylindrical portion, the light beam emitted from the base portion is formed by the slit. Because the optical path length when passing through becomes longer,
The possibility that the light ray leaks out to the outside by the wall surface can be reduced.

According to the second aspect of the present invention, since the light beam from the base portion is blocked by the elastic holding portion, the amount of the light beam leaking to the outside can be further reduced.

According to the third aspect of the present invention, since the covering portion prevents the light beam entering from the inner opening, the leakage amount of the light beam is further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a colored wedge base valve 20.
FIG. 2 is a partially cutaway front view showing a state where is mounted on the valve socket 30 of the present embodiment. First, the wedge base valve 20 will be described with reference to FIG. In the wedge base bulb 20, a substantially cylindrical bulb portion 22 in which a filament 21 is housed, and a base portion 23 extending in a substantially flat shape on the bottom side of the bulb portion 22 are integrally formed of glass. It has a configuration. On both side surfaces of the base portion 23, a locking projection 25 is formed at the center, and a pair of abutting projections (lower than the locking projection 25) are provided on both ends with the locking projection 25 interposed therebetween. 26A, and 26B at substantially the same height as the locking projection 25). Also, the base portion 23
A pair of lead wires 28 connected to both ends of the filament 21 are drawn out from the bottom surface of the filament 21, and are folded back to symmetrical positions with the base portion 23 interposed therebetween. In the wedge base bulb 20, the surface of the bulb portion 22 is colored (for example, amber in the case of an amber bulb), but a part of the surface of the base portion 23 remains colorless and transparent without being colored.

Next, the valve socket 30 will be described. The valve socket 30 includes a socket body 31 made of a synthetic resin, and a pair of holding fittings 50 mounted on the socket body 31. As shown in FIGS. 3 and 4, the socket body 31 has a flange 32 for attaching the socket body 31 to a panel or the like at substantially the center in the vertical direction.
Are protruded in a substantially circular shape from the entire circumference of the socket body 31 toward the outside in the radial direction. Further, below the flange 32, a hood-shaped fitting portion 33 capable of fitting a female connector (not shown) for supplying electricity to the valve socket 30 is provided. Above the flange 32, there is provided a cylindrical portion 34, and a rectangular tube portion 36 thereabove (both the cylindrical portion 34 and the rectangular tube portion 36 correspond to the "tube portion" of the present invention). . Inside the square tube portion 36 and the cylindrical portion 34, a housing portion 37 capable of housing the base portion 23 of the wedge base valve 20 and the pair of holding fittings 50 is provided (see also FIG. 1).

As shown in FIG. 4, the rectangular tube portion 36 is provided point-symmetrically with a pair of long side portions 38 and a pair of short side portions 39, and has a substantially rectangular cross section as a whole. I have. Each long side portion 38 has an orthogonal direction (short side portion 39).
(In a direction parallel to the horizontal direction), a positioning wall 41 is provided inward, and when the base portion 23 is inserted into the accommodation portion 37, the distal end portion of each positioning wall 41 comes into contact with the locking projection 25 and the abutment projection 26A. And the wedge base valve 20 is positioned in the horizontal direction. Further, at substantially four corners in the housing portion 37, a pair of support step portions 43A and 43B are provided at predetermined height positions symmetrically with respect to each other, and when the base portion 23 is inserted to a regular position,
Each of the abutting projections 26A, 26B is provided with a supporting step 43A, 43B.
The wedge base valve 20 is positioned in the insertion direction by abutting on the upper surface of each B.

Further, a pair of substantially U-shaped mounting grooves 44 are provided symmetrically on the bottom surface of the housing portion 37, and a holding bracket 50 described later can be mounted on these.
Further, a pair of terminal holes 45 are opened on the bottom surface of the accommodation portion 37 so as to be continuous with the mounting grooves 44, so that a terminal portion 53 of a holding bracket 50 described later can be inserted into the fitting portion 33 side. . Further, a pair of slits 46 and 47 (slits 4) are formed in the square tube portion 36 at the approximate center of each long side portion 38 from the opening side to the back side.
An arm piece 49 is provided between the slits 46 and 47 by forming a "position shift slit" of the present invention). The arm piece 49 is an arm piece 49 of the square tube portion 36.
Other portions (hereinafter, referred to as the cylindrical body 36A) are separated by the two slits 46 and 47, and can be bent and deformed in the direction away from the center of the housing portion 37 (the slits 46 and 47 will be described later in detail). Described).

On the other hand, the holding fitting 50 is formed by pressing a conductive metal plate material into a predetermined shape and then bending it (see FIGS. 5 to 7). The holding fitting 50 has a flat base 51, and extends from a substantially center to a lower end in a height direction at a side end of the base 51 so that the extension 52 has a substantially U-shape. I have. Further, the extension portion 52
A tab-shaped terminal portion 53 is provided to protrude downward from the front end. The base portion 51 can be fitted into the mounting groove 44 of the housing portion 37. At this time, the terminal portion 53 penetrates the terminal hole 45 and protrudes toward the fitting portion 33, and the female terminal provided in the female connector (not shown). It can be connected to metal fittings. The base 51 and the extension 52 have a retaining piece 51 respectively.
A and 52A are cut and raised outward, and when the holding fitting 50 is mounted in the mounting groove 44, the holding fitting 50 is engaged with the wall surface of the housing portion 37 to prevent the holding fitting 50 from being removed (details). Not shown).

On the base 51, an electrode section 55 and an elastic holding section 56 are provided side by side. The electrode section 55
The upper part of the strip extending from the upper end of the base 51 is formed by folding the upper part inward (to the side of the terminal part 53), and the front end has a contact that can elastically contact the lead wire 28 of the base part 23. 55A are provided. The elastic holding portion 56 is formed by bending a strip extending toward the upper end of the base portion 51, and is formed wider than the electrode portion 55 as a whole. A bent portion 58 is formed in the elastic holding portion 56 at a position close to the base portion 51, and an upper portion from the bent portion 58 is an inclined portion 59 slightly inclined toward the terminal portion 53.
The upper portion of the elastic holding portion 56 can be bent and deformed outward (opposite to the terminal portion 53) around the bent portion 58 as a center. In addition, a pair of vertically extending ribs 61 protruding from the bent portion 58 is provided to reinforce the bent portion 58. At the upper end side of the inclined portion 59, a locking portion 62 bent inward in a substantially U-shape is provided, and can be elastically engaged with the locking projection 25 provided on the base portion 23 of the wedge base valve 20. It has been. Further, the distal end side of the locking portion 62 extends in a substantially horizontal direction up to the extension surface of the base portion 51 to form a pressing portion 64. The pressing portion 64 is in contact with the arm piece 49 so as to press the arm piece 49 outward. As shown in FIG. 7, of the pair of side edges of the pressing portion 64, a side edge 64A opposite to the electrode portion 55 coincides with a side edge 56A of the elastic holding portion 56. On the other hand, the side edge 64B of the pressing portion 64 on the electrode portion 55 side is
The elastic holding portion 56 is notched inward in the width direction with a step difference from the side edge 56B. That is, the elastic holding portion 56
The width increases from the pressing portion 64 toward the inside of the rectangular tube portion 36, and the wider portion serves as a cover portion 63. The edge of the cover 63 formed between the side edges 64B and 56B along the width direction is an excessive flexure restricting portion 65. When the elastic holding portion 56 is flexed and deformed by a predetermined amount, the tubular portion main body 36A is deformed. And restrict excessive bending deformation.

The pair of holding members 50 allow the terminal portions 53 to be inserted into the terminal holes 45 and the base portions 51 respectively.
Then, the extension portion 52 is attached to the socket body 31 by fitting the extension portion 52 into the attachment groove 44 of the accommodation portion 37 (see FIGS. 8 and 9). The two holding members 50 are symmetrically arranged so that the elastic holding portions 56 face each other.
The base portion 23 is inserted between 0 and 0 (the position indicated by the two-dot chain line in the center of the square tube portion 36 in FIG. 8). Further, an arm piece 49 is provided outside each elastic holding portion 56 so as to be along.

Next, the slits 46 and 47 and the elastic holding portion 56 will be described in more detail with reference to FIG. In the slit 46, the side edge 66 of the arm piece 49
And the opposing edge 67 on the side of the tube portion main body 36 </ b> A is provided so as to face in parallel along the thickness direction of the rectangular tube portion 36.
The opposing edge 67 is formed continuously with the positioning wall 41 of the rectangular tube portion 36, and the elastic holding portion 56 and the side edges 56A, 64A of the pressing portion 64 are provided along the positioning wall 41. . Further, the side edge 66 of the arm piece 49 is
The elastic holding portion 56 and the pressing portion 64 are located on the inner side in the width direction than the side edges 56A and 64A.

On the other hand, in the slit 47, the side edge 68 of the arm piece 49 and the opposing edge 69 on the side of the cylinder portion main body 36A are also provided to face each other. These edges 68, 69
Are formed diagonally with respect to the thickness direction of the wall surface of the rectangular tube portion 36, and the slit 47 has an inner opening 71 opening inside the wall surface more elastically than an outer opening 72 opening outside the wall surface. The position is shifted toward the center in the width direction of the portion 56. Also, an edge 71A of the inner opening 71 on the opposing edge 69 side.
Are located outside the side edge 64B of the pressing portion 64 in the width direction and inside the side edge 56B of the elastic holding portion 56 in the width direction.

This embodiment has the above configuration, and its operation will be described below. In order to mount the wedge base valve 20 to the valve socket 30, first, the base portion 23 is inserted between the two holding fittings 50 in the accommodation portion 37. When the base portion 23 is pushed between the pair of locking portions 62, the elastic holding portions 56
Are slightly deflected outward from each other. When the base portion 23 is further advanced, as shown in FIG. 11, the locking portion 62 rides on the locking projection 25, the elastic holding portion 56 is bent outward, and the pressing portion 64 is moved to the arm piece 49.
Is pressed to bend and deform together with the elastic holding portion 56 to the outside. At this time, both side edges 64A, 64B of the pressing portion 64 are
As shown in FIG. 10, since both are located inward in the width direction from the opposing edges 67 and 69 on the side of the cylinder main body 36 </ b> A, the pressing portion 64 deforms the arm piece 49 without interfering with the cylinder main body 36 </ b> A. When the elastic holding portion 56 is deformed by a predetermined amount, as shown in FIG.
Abuts against the cylindrical portion main body 36 </ b> A, and further elastic deformation of the elastic holding portion 56 and the arm piece 49 is regulated. Therefore, it is possible to prevent the elastic holding portion 56 or the arm piece 49 from being excessively bent and deformed and damaged, for example, when the base portion 23 is obliquely inserted.

On the other hand, at substantially the same time when the locking portion 62 rides on the locking projection 25, the tip of the base portion 23 is pushed into between the pair of electrode portions 55, and the contact 55A elastically contacts each lead wire 28. . Subsequently, when the base portion 23 is further pushed in and the locking projection 25 exceeds the locking portion 62, the elastic holding portion 56 is deformed in the return direction, and the locking portion 62 is engaged with the upper portion of the locking projection 25. As a result, the wedge base valve 20 is held in a proper position in a retaining state (see FIGS. 13 and 1).

When the filament 21 emits light when the wedge base bulb 20 is used, the light of the colored color is emitted from the bulb section 22. However, at this time, the light of the filament 21 is emitted from the uncolored base portion 23 as it is. When the slit 13 is provided apart from the elastic holding portion 16 in the width direction as in the conventional valve socket 7, light emitted from the base portion 4 easily leaks to the outside through the slit 13, Therefore, light different in color from the bulb portion will be seen from the outside.

However, in the slit 46 of the present embodiment, as shown in FIG. 10, the side edge 66 of the arm piece 49 is arranged on the inner side in the width direction than the side edge 56A of the elastic holding portion 56. Are provided near the elastic holding portion 56. Accordingly, since the slit 46 is located at a position where it tends to be shaded by the elastic holding portion 56 with respect to the light emitted from the base portion 23, the amount of the light leaking to the outside through the slit 46 can be reduced. Further, in the slit 46, the opposed edge 67 on the side of the cylindrical portion main body 36 </ b> A is continuously arranged on the positioning wall 41, so that the slit 46 tends to be a shadow of the positioning wall 41 with respect to a light beam emitted from the base portion 23. Because of the position, the amount of light leaking outside through the slit 46 is further reduced.

On the other hand, if the slit 47 is formed in parallel with the thickness direction of the wall surface of the rectangular tube portion 36 (for example, at a position indicated by 47X in FIG. 8) as in the prior art, the light beam emitted from the base portion 23 Although, for example, indicated by X in FIG. 8 easily leaks to the outside through the slit 47, in the present embodiment, the inner opening 71 of the slit 47 is displaced inward from the outer opening 72, so that it is provided. Light rays (for example, indicated by Y in FIG. 10) emitted from the base portion 23 do not easily pass through the slit 47. That is, as compared with the case where the slit is formed in parallel with the thickness direction of the rectangular tube portion 36, the light path length when the light beam emitted from the base portion 23 passes through the slit 47 becomes longer. Thus, the possibility of leakage to the outside can be reduced.

Further, since the position of the inner opening 71 of the slit 47 is provided on the center side in the width direction of the elastic holding portion 56 with respect to the position of the outer opening 72, the slit extends along the thickness direction of the square tube portion 36. (For example, 47
Compared with (X), the amount of light rays from the base portion 23 blocked by the elastic holding portion 56 is increased, and the amount of light rays leaking to the outside can be reduced. Further, the elastic holding portion 56 is provided with a covering portion 63 located at the inner opening 71 of the slit 47 in a direction in which the width increases from the arm piece 49 side toward the inside of the rectangular tube portion 36. For this reason, compared with the case where the covering part is not provided unlike the conventional case, the covering part 63 prevents the light beam entering from the inner opening 71, so that the leakage amount of the light ray is further reduced.

As described above, since the amount of light emitted from the base portion 23 leaking to the outside through the slits 46 and 47 is reduced, almost only the colored light of the bulb portion 22 can be seen from the outside. become.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. In the valve socket 80 of the present embodiment, the arm piece 8
1, both slits 82 and 83 (both correspond to the "displacement slits" of the present invention) are both outer openings 82A and 8A.
3A is provided obliquely so as to be displaced outward in the width direction from the inner openings 82B and 83B. Also, the elastic holding portion 8
5 and the pressing portion 86 at the tip thereof are formed to have a constant width as a whole. Since the other configuration is the same as that of the first embodiment, the same configuration is denoted by the same reference numeral and the description is omitted.

The slits 82 and 83 are set so that the elastic holding portion 85 is always located on an optical path (in the range indicated by L1 to L2 or L3 to L4 in FIG. 15) that can pass through the slits 82 and 83, respectively. The valve socket 2 is directly connected from the outside through the slits 82 and 83.
0 base portion 23 cannot be seen. According to the present embodiment, since both the pair of slits 82 and 83 are obliquely provided as the misalignment slits toward the elastic holding portion 85, the amount of light leaking from the base portion 23 to the outside can be further reduced. . Also, the outer openings 82B and 83B are located on the outside as compared with the case where the slit is formed along the thickness direction of the wall surface of the rectangular tube portion 36 as in the related art (provided at the positions indicated by 82X and 83X). The width of the arm piece 81 can be increased by the length of the arm piece 8.
As the strength of (1) increases, the supporting force against the bending deformation of the elastic holding portion 85 also improves.

The technical scope of the present invention is not limited by the above-described embodiments. For example, the followings are also included in the technical scope of the present invention. Also,
In addition, the technical scope of the present invention extends to an equivalent range. (1) In the first embodiment, in the slit 47,
Although the inner opening 71 is provided so as to be displaced from the outer opening 72 toward the center in the width direction of the elastic holding portion 56, according to the present invention, conversely, the inner opening is provided outside the outer opening in the width direction than the outer opening. Is also good. (2) In the first embodiment, the side edge 68 of the arm piece 49
And the opposing edge 69 on the side of the cylinder portion main body 36A are provided in a slanted shape, but according to the present invention, the side edge of the arm piece and the opposing edge on the side of the cylinder portion main body do not have to be inclined. For example, it may be stepped. (3) In the first embodiment, the covering portion 63 is formed on the elastic holding portion 56. However, according to the present invention, the covering portion may not be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a state in which a wedge base valve is mounted on a valve socket according to a first embodiment.

FIG. 2 is a perspective view of a wedge-based valve.

FIG. 3 is a side view of the socket body.

FIG. 4 is a plan view of a socket body.

FIG. 5 is a side view of the holding bracket.

FIG. 6 is a front view of a holding bracket.

FIG. 7 is a plan view of a holding bracket.

FIG. 8 is a plan view of a valve socket.

FIG. 9 is a partially enlarged sectional view of a valve socket.

FIG. 10 is a partially enlarged plan view showing an elastic holding portion and an arm piece.

FIG. 11 is a partially enlarged cross-sectional view showing a process of mounting a wedge base valve to a valve socket.

FIG. 12 is a partially enlarged plan view showing a state in which bending deformation of the elastic holding portion and the arm piece is restricted.

FIG. 13 is a partially enlarged sectional view showing a state in which a wedge base valve is mounted on a valve socket.

FIG. 14 is a plan view of a valve socket according to a second embodiment.

FIG. 15 is a partially enlarged plan view showing an elastic holding portion and an arm piece.

FIG. 16 is an exploded perspective view of a conventional valve socket.

[Explanation of symbols]

 20, 80 ... wedge base valve 23 ... base part 30 ... valve socket 31 ... socket body 34 ... cylindrical part (tube part, wall part) 36 ... square tube part (tube part, wall part) 36A ... tube part body 47, 82 , 83 ... slit (position shift slit) 49, 81 ... arm piece 50 ... holding bracket 55 ... electrode part 56, 85 ... elastic holding part 63 ... covering part 71, 82B, 83B ... inner opening 72, 82A, 83A ... outer opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiro Nakahara 80 Itado, Isehara-shi, Kanagawa F-term in Isehara Works, Isehara Works (reference) 5E024 BC10

Claims (3)

[Claims] A pair of slits are formed from an opening-side edge of a wall portion that can accommodate a base portion of a wedge-based valve and a wall portion that forms the cylinder portion to a back side, so that the wedge-based valve bends between the slits. A socket body having an arm piece provided so as to be deformable; and a socket body provided along the arm piece in the cylindrical portion and supported by the arm piece to elastically hold the base portion from the thickness direction. A valve socket provided with a resilient holding portion and a holding fitting provided with an electrode portion electrically connected to an electrode of the wedge base valve, wherein at least one of the pair of slits has this slit. The position of the outer opening that opens to the outer surface of the wall portion and the position of the inner opening that opens to the inner surface of the wall portion are shifted from the position that matches the thickness direction of the wall portion. Bulb socket, characterized in that there is a shift slit. 2. The valve socket according to claim 1, wherein the position of the inner opening of the misalignment slit is provided closer to the widthwise center of the elastic holding portion than the position of the outer opening. . 3. The elastic holding portion is provided with a cover at a position located at an inner opening of the misalignment slit in a direction in which the width increases from one side of the arm toward the inside of the cylindrical portion. The valve socket according to claim 1, wherein: