JP2012107749A - Wall penetration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall penetration device stably fitting an elastic sealing material in a wall hole uniformly on the whole periphery.SOLUTION: The wall penetration device includes: an edge member 21 arranged at the front opening of a wall body W penetrating through the wall hole H; a cylindrical member 10 arranged inside of the wall hole H; and an elastic seal member 11 interposed between the cylindrical member 10 and the wall body W and having a water stopping function in a uniform compression state. A back member 24 engaged with and abutting on the back of the wall body W is provided as a connection means for integrally fixing the edge member 20 and cylindrical member 10 to the wall body W. The cylindrical member 10 is formed separately from the edge member 20 by a circular diameter-enlarging body enlarging a diameter to the inner peripheral surface of the wall hole H, and is configured by affixing the elastic seal member 11 to the whole periphery. Thereby, stable water stopping over the whole periphery is secured between the wall hole H and the cylindrical member 10 by a simple fitting operation.

Description

  The present invention relates to the field of a wall penetrating device fixed to a wall hole.

  The wall penetrating device fixes a frame material composed of a cylindrical portion and an edge portion to which an elastic seal material is attached to a wall hole by a fixing means. At the time of fixing, the elastic seal material of the cylindrical portion may be rubbed or broken by friction, resulting in a gap. Since this fixing mistake is blocked by the edge, the fixing operator cannot confirm. For this reason, the water droplet which propagates an outer wall leaks to an inner wall side through a wall hole.

  Therefore, in Patent Document 1, the size of the dharma type ring is adjusted with a turnbuckle. However, there is a risk of water leakage because an elastic sealing material cannot be attached to the turnbuckle joint of the Dalma ring. Further, since the Dalma type ring is screwed to the wall, the Dalma type ring is distorted by tightening the screw to form a gap, which may cause water leakage. Furthermore, since the screw hole is formed on the side of the wall hole, the wall may collapse and leak water.

Japanese Patent No. 4106945 (pages 3-4, FIGS. 4-5)

  Conventionally, when fixing to a wall hole, the elastic seal member of a cylinder part is rolled or broken, and a gap is generated, resulting in water leakage.

  The present invention provides a wall penetrating device that can be fixed to a wall hole without causing a gap and can be reliably waterproofed.

  The invention which concerns on Claim 1 is the edge member arrange | positioned in the front opening part of the wall body which penetrated and formed the wall hole, the cylinder member arrange | positioned in the wall hole, and between this cylinder member and a wall body In a wall penetrating device comprising an elastic sealing member having a water stopping action in a uniform compressed state, the edge member and the cylindrical member are engaged with the rear surface of the wall body as a connecting means for integrally fixing to the wall body. A back surface member is provided, and the cylindrical member is formed separately from the edge member by a circular-shaped expanded body that can be expanded to the inner peripheral surface of the wall hole, and the elastic seal member is attached to the entire circumference. It is characterized by becoming.

  The invention according to claim 2 is the invention according to claim 1, wherein the elastic seal member is arranged in a range up to the front opening end and is in contact with the elastic seal member between the edge member and the front opening. It is characterized in that an elastic sealing material having a water stopping action in a uniform compressed state is provided.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1 or claim 2, a connecting stay is provided on the cylindrical member so as to be opposed to the edge member and fixed to each other.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the diameter-enlarged body forms two free ends by cutting an elastic body having a circular shape. It is characterized by forming a cut portion with its ends facing each other.

  The invention according to claim 5 is the invention according to claim 4, wherein the back member is constituted by two projecting bodies that project in the radial direction and extend to the rear surface of the wall body, and the two projecting bodies are formed of the wall holes. The edge member is provided with a support column that supports the diameter line.

  The invention according to claim 6 is the invention according to any one of claims 1 to 3, wherein the diameter-enlarged body is a cut in which the respective free ends face each other by a plurality of divided bodies divided in the circumferential direction. It is characterized by forming a part.

  The invention according to a seventh aspect is the invention according to the fourth to sixth aspects, wherein the cutting portion forms a bent portion so as to abut against each other free end, and extends to these bent portions. An elastic seal member on the outer periphery of the cylindrical member is attached.

  According to an eighth aspect of the present invention, in the invention according to the sixth or seventh aspect, the back member is formed by an elastic engagement portion that is elastically expanded and engageable with the back surface of the wall body. The engaging portion is supported by the edge member.

  The invention according to claim 9 is characterized in that, in the invention according to claim 8, the elastic engagement portion is supported by the edge member via a leg portion that acts elastically in the diameter expansion direction.

  The invention according to claim 10 is the invention according to any one of claims 1 to 3, wherein the diameter-enlarged body is two semicircular arc bodies pivotally supported by a diameter line of a wall hole so as to be opened and closed. It is characterized by comprising.

  The invention according to claim 11 is characterized in that, in the invention according to claim 10, the back member is formed integrally with each of the two semicircular arc bodies.

  The invention according to claim 12 is characterized in that, in the invention according to claim 11, the back member is constituted by a projecting plate extending from each of the two semicircular arc bodies in the diameter increasing direction.

  According to the first aspect of the present invention, the edge member is disposed in the front opening of the wall body, the tubular member is disposed in the wall hole, and the elastic seal member is interposed between the tubular member and the wall body. For the wall penetrating device that stops water inside and outside, the edge member and the cylindrical member are fixed to the wall hole portion using the back member as a connecting means, and at this time, the cylindrical member is separated from the edge member by a circular-shaped enlarged body The elastic seal member that is configured and adhered to the cylindrical member around the entire circumference of the elastic seal member is integrally bonded to the outer periphery of the expanded body, and the reduced-diameter cylindrical member is within the work field of view in front of the opening. In addition, the elastic sealing material is brought into close contact with the inner peripheral surface of the wall hole and uniformly compressed by enlarging the diameter of the cylindrical member. Ensuring a stable watertight action over the entire circumference of the cylinder member by a simple mounting operation without incurring It can be.

  According to the invention of claim 2, in addition to the effect of claim 1, the elastic sealing material in the wall hole and the elastic sealing material of the front opening are bent and contacted at the front opening end of the wall hole, Waterproofness is ensured by the long water stop process which bends by both.

  According to the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the edge member can be integrally fixed to the cylindrical member via the connecting stay, so that the front opening of the wall body Since the wall member can be protected by avoiding the mounting load of the edge member, the function of the wall penetrating device can be stabilized for a long time as the durability of the wall member is improved.

  According to the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the cutting portion is separated by the circular elastic body having the cutting portion having the free ends opposed to each other. The cylindrical member that can be freely deformed can be easily configured.

  According to the invention of claim 5, in addition to the effect of the invention of claim 4, a support along the diameter line of the wall hole is provided on the edge member, and the back member by the two overhanging bodies extending to the back of the wall body is supported. Therefore, the wall penetrating device can be attached by the operation of attaching the back member in the front opening of the wall hole.

  According to the invention according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 3, it is possible to deform freely by separation by a cutting portion that abuts the free ends of the plurality of divided bodies. The cylindrical member can be configured easily.

  According to the invention according to claim 7, in addition to the effect of the invention according to any one of claims 4 to 6, the elastic seal on the outer periphery of the cylindrical member is provided at each of the bent portions of the free end formed so as to be able to face each other. Since the cutting part is configured by sticking the member, it is possible to secure water stoppage in the facing contact state as well as the deformable handling by the cutting part.

  According to the invention according to claim 8, in addition to the effect of the invention according to claim 6 or 7, the elastic engagement portion provided on the edge member is inserted into the wall hole at the position of the back surface of the wall body. The wall penetrating device can be mounted by a simple operation since the diameter is expanded and the contact is brought into contact with the back member.

  According to the invention according to claim 9, in addition to the effect of the invention according to claim 8, since the leg portion acting in the diameter expanding direction exerts the diameter expanding action on the cylindrical member, a plurality of divided bodies divided in the circumferential direction The diameter-expanded body can be held at the diameter-expanded position.

  According to the invention according to claim 10, in addition to the effect of the invention according to any one of claims 1 to 3, an operation of opening the enlarged body by the two semicircular arc bodies pivotally supported by the diameter line is performed. Thus, the diameter of the cylindrical member can be easily expanded.

  According to the eleventh aspect of the invention, in addition to the effect of the tenth aspect, the wall penetrating device can be easily configured by the cylindrical member and the edge member in which the back member is integrated.

  According to the invention of claim 12, in addition to the effect of the invention of claim 11, the back member is formed by the projecting plate extending from the cylindrical member in the diameter increasing direction. The back surface member can act on the back surface to attach and fix the wall penetrating device, and by forming an overhanging plate on the entire circumference, an elastic seal member for the entire periphery seal on the back surface can be interposed. It becomes possible.

It is a perspective view which shows the external appearance structure of the wall penetration apparatus which concerns on this invention. It is sectional drawing which shows the assembly procedure of a wall penetration apparatus. It is sectional drawing which shows the assembly completion state of a wall penetration apparatus. It is a partial expanded sectional view explaining the effect of this invention, (a) is an invention, (b) is conventional. It is a front view which shows various variable shape cylinder members. It is sectional drawing (a) which shows a secondary waterproof structure, (b), and a perspective view (c). It is a perspective view which shows the external appearance structure of the wall penetration apparatus provided with the elastic engagement part. It is a perspective view which shows the external appearance structure of the wall penetration apparatus provided with the prism-shaped variable shape cylinder member. It is a perspective view which shows the external appearance structure of the wall penetration apparatus provided with the connection stay. It is the principal part front view (a) of the cylinder part of a half opening and closing structure, and sectional drawing (b) of a mounting state. It is a sectional view (b) of a half opening / closing type cylinder part front view (a) of another structural example, and a mounting process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals.
The wall penetrating device includes an edge member disposed in the front opening of the wall body, a cylindrical member disposed in the wall hole, a back member serving as a connecting means for mounting and fixing to the wall body, and an outer peripheral portion of the cylindrical member. The cylindrical member is configured as a diameter-enlarged body made of a variable-shaped cylindrical member that can be expanded in diameter separately from the edge member, and is configured by adhering an elastic seal member to the entire periphery thereof.

  As a specific example, in the wall penetrating device of FIG. 1, the deformable cylinder member 10 having the elastic seal member 11 attached to the entire circumference, the edge member having the elastic seal member 21 attached separately from the variable cylinder member 10. A frame member is constituted by the connecting member 24 having a U-shape in plan view and connecting the edge member 20 to the variable cylindrical member 10.

Next, the assembly procedure will be described with reference to FIGS.
First, the deformable cylindrical member 10 is fixed to the wall hole H of the wall W (FIG. 2A). As shown in FIG. 1, the deformable cylindrical member 10 has the cutting part 12 in the axis ax direction. Therefore, if the left and right sides are shifted in the axis ax direction as indicated by dotted lines at the cutting part 12, the diameter is larger than the wall hole H. Further, the elastic seal member 11 can be fixed without being bent or broken. Thus, the deformable cylindrical member 10 functions as a diameter-expandable body that can be expanded separately from the edge member, and the elastic seal member 11 can be uniformly brought into close contact with the inner peripheral surface of the wall hole H without difficulty. it can.

  Subsequently, the edge member 20 is brought into intimate contact with one end of the deformable cylindrical member 10, and the elastic seal members 11 and 21 are brought into contact with each other (FIG. 2B). Furthermore, the plate portion 24A of the connecting means 24 is applied to the struts 22 in the radial direction of the edge member 20, and the engaging portion 24B is brought closer to the inner wall (FIG. 2 (c)).

  Here, when the nut 25 is tightened on the bolt 23 of the support 22, the nut 25 presses the plate portion 24 </ b> A against the support 22. As a result, the edge member 20 integral with the column 22 presses the outer wall, the engaging portions 24B of the plate portion 24A engage with the inner wall from both sides of the column 22 through the variable shape cylindrical member 10, and the edge member 20 is variable. It is connected to one end of the cylindrical member 10 (FIG. 2D). Finally, the cover 30 is fixed by the nut 31 and the assembly is completed when the pipe P is passed (FIG. 3). Thus, the connecting means 24 functions as a back member that is attached to the support column 22 as a projecting body that projects in the radial direction and engages with the inner surface of the wall body.

The effect of the invention will be described with reference to FIG.
In the prior art of FIG. 4B, as described above, the elastic seal member 121 is rolled or broken in the wall hole H to form a gap. In addition, this fixing mistake is blocked by the edge member 120 and cannot be confirmed by the fixing operator. For this reason, water droplets attached to the location a on the outer wall, which is often decorated, are transmitted through the location b between the outer wall and the elastic seal member 121 and leak to the inner wall side through the location c of the wall hole H.

  On the other hand, in the invention of FIG. 4A, the diameter of the deformable cylindrical member 10 can be deformed to be smaller than that of the wall hole H, so that the elastic seal member 11 can be in close contact with the wall hole H without being bent or broken. Further, since the deformable cylindrical member 10 is separate from the edge member 20, the fixing operator can confirm and repair a fixing error without being blocked by the edge member 20. Therefore, even if a water droplet is transmitted from the location a to the location b on the outer wall, it does not pass through the location c.

  Further, since the edge member 20 is brought into intimate contact with one end of the deformable cylindrical member 10 by the connecting means 24 and the elastic seal members 11 and 21 are brought into contact with each other, the elastic seal member 11 is disposed around the entire circumference of the variable cylindrical member 10. As compared with Patent Document 1 using a turnbuckle, there is no place where the elastic seal member 11 cannot be pasted, and it can be waterproofed reliably. And it becomes waterproof at the location x where the elastic seal members 11 and 21 come into contact with each other, and the waterproof performance is improved.

  Furthermore, since the deformable cylindrical member 10 and the edge member 20 are coupled by the support column 22 and the connecting means 24, a screw or a screw hole is unnecessary, and the deformation of the deformable cylindrical member 10 and the collapse of the wall W can be prevented. Can be reliably waterproofed.

  Further, as shown in FIG. 5A, the pair of bent portions 13 to which the elastic seal member 11 is attached by bending the cut portion 12 to the inner peripheral side are formed at the time of fixing. The elastic seal members 11 come into contact with each other, and the cut portion 12 is reliably waterproofed.

In addition, there are the following variations.
<Variable shape cylindrical member>
In FIG. 1, the deformable cylindrical member 10 is easily deformed and easily fixed to the wall hole H by providing the cutting portion 12, but in addition to this, for example, as shown in FIG. If the variable shape cylindrical member 10 is divided by forming 12, the deformation of the variable shape cylindrical member 10 becomes easier and it becomes easier to fix to the wall hole H.

<Secondary waterproof>
A waterproof member 40 such as a hood may be provided on the outer wall side as shown in FIG. 6A, or the edge portion 14 provided with the elastic seal member 15 as shown in FIGS. You may provide in the other end of the variable shape cylinder member 10. FIG. By these, secondary waterproofing becomes possible and waterproof performance improves.

<Connecting means>
As shown in FIG. 7, when the edge member 20 is brought into close contact with one end of the deformable cylinder member 10, a number of elastic engagement portions 26 that engage the inner wall through the deformable cylinder member 10 are connected to the edge member 20 as connection means. It may be provided. The elastic engagement portion 26 functions as a back member that integrally attaches and fixes the edge member 20 and the variable shape cylindrical member 10 to the wall hole portion, and prevents deformation of the variable shape cylindrical member 10 and collapse of the wall W. The support 22 is not required, and the penetrating portion in the wall penetrating apparatus is expanded, so that the application is expanded.

  Note that the deformable cylindrical member 10 may be pressed against the inner periphery of the wall hole H by the elastic engagement portion 26 during the connection. Since the elastic seal member 11 of the deformable cylinder member 10 is pressed against the inner periphery of the wall hole H, it can be reliably waterproofed. This method is particularly effective when the deformable cylindrical member 10 is divided into a prismatic shape at the cutting part 12 and the elastic seal member 11 is difficult to adhere to the wall hole H as shown in FIG. That is, with respect to the right side portion of the square hole, the leg portion of the elastic engagement portion 26 acts elastically in the direction of expanding the diameter of the deformable cylindrical member 10, thereby ensuring the water stoppage by the elastic seal member 11. it can.

  As shown in FIG. 9, several connecting stays 16 and 27 that make a pair may be provided on the deformable cylindrical member 10 and the edge member 20 as connecting means. In FIG. 9, the bolts 28 and the nuts 29 are connected. In addition to preventing the deformation of the deformable cylindrical member 10 and the collapse of the wall W, the support 22 is not required, and the penetration portion in the wall penetrating device is widened, thereby widening the use. As the fixing means, for example, some of the engaging portions 17 that press against the inner wall side are provided on the deformable cylindrical member 10. In this case, if the diameter of the deformable cylindrical member 10 is changed to be smaller than that of the wall hole H as indicated by a dotted line, it can be fixed even from the outer wall side.

<Opening and closing configuration>
Next, a cylindrical member having an open / close configuration will be described. As shown in FIG. 10, a main part front view (a) of the cylindrical part and a sectional view (b) of the mounted state, the cylindrical member 51 includes two kamaboko-roof-shaped roofs. The semicircular arc bodies 51a, 51a are connected to each other by pivotal portions 52, 52 such as eyelets so as to be rotatable around a diameter line, and are configured to be openable. Each of the two semicircular arcs 51a, 51a has a connecting stay 54 provided with a screwing hole for fastening opposite to the edge member 53 to which the elastic seal member 53a is attached at the opening end position of the wall hole H. A back surface that extends to the equally divided position and extends over the entire circumference by extending the extension plates 55 and 55 so that they can be engaged with the back surface of the wall body in the diameter increasing direction at the other end of the wall hole H. Form a member. An elastic seal member 56 is integrally attached to the outer periphery of the two semicircular arc bodies 51a and 51a.

  The wall penetrating device using the cylindrical member 51 having the above-described configuration is a state in which the diameter of the cylindrical member 51 is reduced by rotating the two semicircular arcs 51a and 51a to close the diameter line passing through the two shaft support portions 52 and 52. Can be accommodated in the wall hole H, and the elastic seal member 56 can be easily expanded in diameter by opening it so as to expand its diameter and aligning the projecting plates 55, 55 with the back surface of the wall body. By being in close contact with H, all-around water is ensured. Next, by fastening the edge member 53 to the connecting stays 54, the wall penetrating device can be mounted and fixed to the wall hole portion of the wall body while securing water-stopping properties.

  Note that the wall penetrating device can be similarly configured by dividing the projecting plates 55 and 55, and if necessary, between the back members 55 and 55 and the rear surface of the wall body over the entire circumference. By providing an elastic seal member that extends over the entire circumference, a long water stoppage can be ensured. Further, the mounting of the cylindrical member 51 is particularly suitable for operation from the back side of the wall hole H.

  As another configuration example, as shown in FIG. 11, a front view of an openable cylinder part (a) and a cross-sectional view (b) in which the mounting process is shown, the cylinder member 61 has two semicircular arcs of a semi-cylindrical roof shape. By connecting the bodies 61a, 61a so as to be rotatable about the diameter line by the shaft support portions 62, 62 such as a round hole fitting portion, an axis that passes through the two shaft support portions 62, 62 is configured to be openable. The semicircular arc members 61a and 61a are respectively attached with back members 65 and 65 that extend in the diameter increasing direction at the rear end position of the wall hole H and engage with the back surface of the wall member. On the attachment base of the back member 65, a connecting stay 64 is formed at a position to be the opening end of the wall hole H so as to be opposed to the edge member 63 to which the elastic seal member 63 a is adhered. . An elastic seal member 66 is integrally attached to the outer periphery of the two semicircular arc bodies 61a and 61a.

  The wall penetrating device using the cylindrical member 61 having the above-described configuration is a state in which the cylindrical member 61 is reduced in diameter by rotating so as to close the two semicircular arc bodies 61a and 61a with respect to a diameter line passing through the two shaft support portions 62 and 62. Can be accommodated in the wall hole H of the wall body, and the elastic seal member 66 can be expanded without difficulty by opening it so as to expand the diameter and aligning the back members 65 and 65 with the back surface of the wall body. By being in close contact with the wall hole H, all-around water stoppage is ensured. Next, by fastening the edge member 63 to the connecting stays 64..., The water penetration including the front side of the wall body can be secured and the wall penetration device can be mounted and fixed to the wall hole H portion.

  As described above, the wall penetrating device according to the present invention includes an edge member disposed at the opening edge of the wall body, a cylindrical member disposed within the wall hole, and a back surface member that engages and contacts the back surface of the wall body. The cylindrical member is configured to be integrally mounted on the wall hole, and the cylindrical member is configured as a diameter-enlarged body by a variable-shaped cylindrical member capable of expanding the diameter, whereby an elastic seal member is adhered to the outer peripheral surface and the wall hole is After being disposed, the elastic seal member can be interposed between the tubular member and the wall body without damaging the elastic seal member by the diameter expansion operation. As a result, the elastic sealing member can be uniformly compressed and intimately provided between the opposing surfaces to ensure water-stopping performance over the entire circumference.

10 Variable cylindrical member (expanded body)
DESCRIPTION OF SYMBOLS 11 Elastic seal member 12 Cutting | disconnection part 13 Bending part 14 Edge 15 Elastic seal member 16 Connection stay 17 Engagement part 20 Edge member 21 Elastic seal member 22 Strut 24 Overhang body (back surface member)
24B engaging part 26 elastic engaging part (back member)
27 connecting stay 51 cylindrical member (expanded body)
51a Semicircular arc body 52 Shaft support 53 Edge member 53a Elastic seal member 54 Connection stay 55 Overhang plate (back member)
56 Elastic seal member 61 Tube member (expanded body)
61a Semicircular arc body 62 Shaft support 63 Edge member 63a Elastic seal member 64 Connecting stay 65 Back member 66 Elastic seal member 120 Edge member 121 Elastic seal member W Wall body H Wall hole

Claims (12)

Uniform compression by interposing between the edge member arranged in the front opening of the wall body penetrating the wall hole, the cylinder member arranged in the wall hole, and the cylinder member and the wall body In the wall penetrating device consisting of an elastic seal member having a water stop action in the state,
As a connecting means for integrally fixing the edge member and the cylindrical member to the wall body, a back surface member that engages and contacts the back surface of the wall body is provided, and the cylindrical member has a circular shape that can be expanded to the inner peripheral surface of the wall hole. A wall penetrating device characterized in that it is formed separately from the edge member by a diameter body, and the elastic sealing member is attached to the entire circumference.   The elastic seal member is disposed in a range up to the front opening end, and is in contact with the elastic seal member and interposed between the edge member and the front opening to have a water stop action in a uniform compression state. 2. The wall penetrating apparatus according to claim 1, further comprising an elastic sealing material.   The wall penetrating apparatus according to claim 1, wherein a connecting stay is provided on the cylindrical member so as to be opposed to the edge member and fixed to each other.   The said diameter-expansion body forms the two free ends by the cutting | disconnection to the circular-shaped elastic body, and forms the cutting part which opposed these two free ends, The Claims 1-3 characterized by the above-mentioned. The wall penetration apparatus in any one of.   The back member is constituted by two projecting bodies that project in the radial direction and extend to the rear surface of the wall body, and a column that supports the two projecting bodies on the diameter line of the wall hole is provided on the edge member. The wall penetrating apparatus according to claim 4.   The wall according to any one of claims 1 to 3, wherein the diameter-enlarged body is formed by a plurality of divided bodies divided in the circumferential direction to form cut portions that face each free end. Penetration device.   The cutting portion is formed by forming bent portions so as to abut each other at respective free ends, and sticking an elastic seal member on an outer periphery of the cylindrical member over the bent portions. The wall penetration apparatus in any one of Claims 4-6.   The said back member is comprised by the elastic engaging part which can be elastically expanded in diameter and can be engaged with a wall body back surface, and this elastic engaging part is supported by the said edge member, It is characterized by the above-mentioned. Or the wall penetration apparatus of Claim 7.   The wall penetrating apparatus according to claim 8, wherein the elastic engagement portion is supported by an edge member via a leg portion that elastically acts in a diameter increasing direction.   4. The wall penetration according to claim 1, wherein the diameter-expanding body is constituted by two semicircular arc bodies that are supported so as to be capable of opening and closing with a diameter line of a wall hole as a supporting shaft. apparatus.   The wall penetrating apparatus according to claim 10, wherein the back member is formed integrally with each of the two semicircular arc bodies.   The wall penetrating apparatus according to claim 11, wherein the back member is constituted by a projecting plate extending from each of the two semicircular arc bodies in the diameter increasing direction.

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